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mm/mmap.c
98.9 KB
1da177e4c Linux-2.6.12-rc2 |
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/* * mm/mmap.c * * Written by obz. * |
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* Address space accounting code <alan@lxorguk.ukuu.org.uk> |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/backing-dev.h> |
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#include <linux/mm.h> |
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#include <linux/vmacache.h> |
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#include <linux/shm.h> #include <linux/mman.h> #include <linux/pagemap.h> #include <linux/swap.h> #include <linux/syscalls.h> |
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#include <linux/capability.h> |
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#include <linux/init.h> #include <linux/file.h> #include <linux/fs.h> #include <linux/personality.h> #include <linux/security.h> #include <linux/hugetlb.h> |
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#include <linux/shmem_fs.h> |
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#include <linux/profile.h> |
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#include <linux/export.h> |
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#include <linux/mount.h> #include <linux/mempolicy.h> #include <linux/rmap.h> |
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#include <linux/mmu_notifier.h> |
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#include <linux/mmdebug.h> |
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#include <linux/perf_event.h> |
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#include <linux/audit.h> |
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#include <linux/khugepaged.h> |
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#include <linux/uprobes.h> |
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#include <linux/rbtree_augmented.h> |
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#include <linux/notifier.h> #include <linux/memory.h> |
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#include <linux/printk.h> |
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#include <linux/userfaultfd_k.h> |
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#include <linux/moduleparam.h> |
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#include <linux/pkeys.h> |
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#include <linux/oom.h> |
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|
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#include <linux/uaccess.h> |
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#include <asm/cacheflush.h> #include <asm/tlb.h> |
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#include <asm/mmu_context.h> |
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|
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#include "internal.h" |
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#ifndef arch_mmap_check #define arch_mmap_check(addr, len, flags) (0) #endif |
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#ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS const int mmap_rnd_bits_min = CONFIG_ARCH_MMAP_RND_BITS_MIN; const int mmap_rnd_bits_max = CONFIG_ARCH_MMAP_RND_BITS_MAX; int mmap_rnd_bits __read_mostly = CONFIG_ARCH_MMAP_RND_BITS; #endif #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS const int mmap_rnd_compat_bits_min = CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MIN; const int mmap_rnd_compat_bits_max = CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MAX; int mmap_rnd_compat_bits __read_mostly = CONFIG_ARCH_MMAP_RND_COMPAT_BITS; #endif |
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static bool ignore_rlimit_data; |
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core_param(ignore_rlimit_data, ignore_rlimit_data, bool, 0644); |
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|
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static void unmap_region(struct mm_struct *mm, struct vm_area_struct *vma, struct vm_area_struct *prev, unsigned long start, unsigned long end); |
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/* description of effects of mapping type and prot in current implementation. * this is due to the limited x86 page protection hardware. The expected * behavior is in parens: * * map_type prot * PROT_NONE PROT_READ PROT_WRITE PROT_EXEC * MAP_SHARED r: (no) no r: (yes) yes r: (no) yes r: (no) yes * w: (no) no w: (no) no w: (yes) yes w: (no) no * x: (no) no x: (no) yes x: (no) yes x: (yes) yes |
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* |
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* MAP_PRIVATE r: (no) no r: (yes) yes r: (no) yes r: (no) yes * w: (no) no w: (no) no w: (copy) copy w: (no) no * x: (no) no x: (no) yes x: (no) yes x: (yes) yes * |
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* On arm64, PROT_EXEC has the following behaviour for both MAP_SHARED and * MAP_PRIVATE: * r: (no) no * w: (no) no * x: (yes) yes |
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*/ |
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pgprot_t protection_map[16] __ro_after_init = { |
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__P000, __P001, __P010, __P011, __P100, __P101, __P110, __P111, __S000, __S001, __S010, __S011, __S100, __S101, __S110, __S111 }; |
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#ifndef CONFIG_ARCH_HAS_FILTER_PGPROT static inline pgprot_t arch_filter_pgprot(pgprot_t prot) { return prot; } #endif |
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pgprot_t vm_get_page_prot(unsigned long vm_flags) { |
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pgprot_t ret = __pgprot(pgprot_val(protection_map[vm_flags & |
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(VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)]) | pgprot_val(arch_vm_get_page_prot(vm_flags))); |
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return arch_filter_pgprot(ret); |
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} EXPORT_SYMBOL(vm_get_page_prot); |
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static pgprot_t vm_pgprot_modify(pgprot_t oldprot, unsigned long vm_flags) { return pgprot_modify(oldprot, vm_get_page_prot(vm_flags)); } /* Update vma->vm_page_prot to reflect vma->vm_flags. */ void vma_set_page_prot(struct vm_area_struct *vma) { unsigned long vm_flags = vma->vm_flags; |
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pgprot_t vm_page_prot; |
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|
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vm_page_prot = vm_pgprot_modify(vma->vm_page_prot, vm_flags); if (vma_wants_writenotify(vma, vm_page_prot)) { |
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vm_flags &= ~VM_SHARED; |
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vm_page_prot = vm_pgprot_modify(vm_page_prot, vm_flags); |
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} |
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/* remove_protection_ptes reads vma->vm_page_prot without mmap_sem */ WRITE_ONCE(vma->vm_page_prot, vm_page_prot); |
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} |
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/* |
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* Requires inode->i_mapping->i_mmap_rwsem |
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*/ static void __remove_shared_vm_struct(struct vm_area_struct *vma, struct file *file, struct address_space *mapping) { if (vma->vm_flags & VM_DENYWRITE) |
496ad9aa8 new helper: file_... |
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atomic_inc(&file_inode(file)->i_writecount); |
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if (vma->vm_flags & VM_SHARED) |
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mapping_unmap_writable(mapping); |
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flush_dcache_mmap_lock(mapping); |
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vma_interval_tree_remove(vma, &mapping->i_mmap); |
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flush_dcache_mmap_unlock(mapping); } /* |
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* Unlink a file-based vm structure from its interval tree, to hide |
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* vma from rmap and vmtruncate before freeing its page tables. |
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*/ |
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void unlink_file_vma(struct vm_area_struct *vma) |
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{ struct file *file = vma->vm_file; |
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if (file) { struct address_space *mapping = file->f_mapping; |
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i_mmap_lock_write(mapping); |
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__remove_shared_vm_struct(vma, file, mapping); |
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i_mmap_unlock_write(mapping); |
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} |
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} /* * Close a vm structure and free it, returning the next. */ static struct vm_area_struct *remove_vma(struct vm_area_struct *vma) { struct vm_area_struct *next = vma->vm_next; |
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might_sleep(); |
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if (vma->vm_ops && vma->vm_ops->close) vma->vm_ops->close(vma); |
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if (vma->vm_file) |
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fput(vma->vm_file); |
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mpol_put(vma_policy(vma)); |
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vm_area_free(vma); |
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return next; |
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} |
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static int do_brk_flags(unsigned long addr, unsigned long request, unsigned long flags, struct list_head *uf); |
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SYSCALL_DEFINE1(brk, unsigned long, brk) |
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{ |
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unsigned long retval; |
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unsigned long newbrk, oldbrk; struct mm_struct *mm = current->mm; |
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struct vm_area_struct *next; |
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unsigned long min_brk; |
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bool populate; |
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LIST_HEAD(uf); |
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|
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if (down_write_killable(&mm->mmap_sem)) return -EINTR; |
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|
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#ifdef CONFIG_COMPAT_BRK |
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/* * CONFIG_COMPAT_BRK can still be overridden by setting * randomize_va_space to 2, which will still cause mm->start_brk * to be arbitrarily shifted */ |
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if (current->brk_randomized) |
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min_brk = mm->start_brk; else min_brk = mm->end_data; |
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#else min_brk = mm->start_brk; #endif if (brk < min_brk) |
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goto out; |
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/* * Check against rlimit here. If this check is done later after the test * of oldbrk with newbrk then it can escape the test and let the data * segment grow beyond its set limit the in case where the limit is * not page aligned -Ram Gupta */ |
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if (check_data_rlimit(rlimit(RLIMIT_DATA), brk, mm->start_brk, mm->end_data, mm->start_data)) |
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goto out; |
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newbrk = PAGE_ALIGN(brk); oldbrk = PAGE_ALIGN(mm->brk); if (oldbrk == newbrk) goto set_brk; /* Always allow shrinking brk. */ if (brk <= mm->brk) { |
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if (!do_munmap(mm, newbrk, oldbrk-newbrk, &uf)) |
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goto set_brk; goto out; } |
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/* Check against existing mmap mappings. */ |
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next = find_vma(mm, oldbrk); if (next && newbrk + PAGE_SIZE > vm_start_gap(next)) |
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goto out; /* Ok, looks good - let it rip. */ |
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if (do_brk_flags(oldbrk, newbrk-oldbrk, 0, &uf) < 0) |
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goto out; |
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|
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set_brk: mm->brk = brk; |
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populate = newbrk > oldbrk && (mm->def_flags & VM_LOCKED) != 0; up_write(&mm->mmap_sem); |
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userfaultfd_unmap_complete(mm, &uf); |
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if (populate) mm_populate(oldbrk, newbrk - oldbrk); return brk; |
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out: retval = mm->brk; up_write(&mm->mmap_sem); return retval; } |
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static long vma_compute_subtree_gap(struct vm_area_struct *vma) { |
1be7107fb mm: larger stack ... |
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unsigned long max, prev_end, subtree_gap; /* * Note: in the rare case of a VM_GROWSDOWN above a VM_GROWSUP, we * allow two stack_guard_gaps between them here, and when choosing * an unmapped area; whereas when expanding we only require one. * That's a little inconsistent, but keeps the code here simpler. */ max = vm_start_gap(vma); if (vma->vm_prev) { prev_end = vm_end_gap(vma->vm_prev); if (max > prev_end) max -= prev_end; else max = 0; } |
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if (vma->vm_rb.rb_left) { subtree_gap = rb_entry(vma->vm_rb.rb_left, struct vm_area_struct, vm_rb)->rb_subtree_gap; if (subtree_gap > max) max = subtree_gap; } if (vma->vm_rb.rb_right) { subtree_gap = rb_entry(vma->vm_rb.rb_right, struct vm_area_struct, vm_rb)->rb_subtree_gap; if (subtree_gap > max) max = subtree_gap; } return max; } |
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#ifdef CONFIG_DEBUG_VM_RB |
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static int browse_rb(struct mm_struct *mm) |
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{ |
acf128d04 mm: validate_mm b... |
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struct rb_root *root = &mm->mm_rb; |
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int i = 0, j, bug = 0; |
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struct rb_node *nd, *pn = NULL; unsigned long prev = 0, pend = 0; for (nd = rb_first(root); nd; nd = rb_next(nd)) { struct vm_area_struct *vma; vma = rb_entry(nd, struct vm_area_struct, vm_rb); |
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if (vma->vm_start < prev) { |
ff26f70f4 mm/mmap.c: clean ... |
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pr_emerg("vm_start %lx < prev %lx ", vma->vm_start, prev); |
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bug = 1; } if (vma->vm_start < pend) { |
ff26f70f4 mm/mmap.c: clean ... |
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pr_emerg("vm_start %lx < pend %lx ", vma->vm_start, pend); |
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bug = 1; } if (vma->vm_start > vma->vm_end) { |
ff26f70f4 mm/mmap.c: clean ... |
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pr_emerg("vm_start %lx > vm_end %lx ", vma->vm_start, vma->vm_end); |
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bug = 1; } |
acf128d04 mm: validate_mm b... |
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spin_lock(&mm->page_table_lock); |
5a0768f64 mm: check rb_subt... |
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if (vma->rb_subtree_gap != vma_compute_subtree_gap(vma)) { |
8542bdfc6 mm/mmap.c: use pr... |
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pr_emerg("free gap %lx, correct %lx ", |
5a0768f64 mm: check rb_subt... |
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vma->rb_subtree_gap, vma_compute_subtree_gap(vma)); bug = 1; } |
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spin_unlock(&mm->page_table_lock); |
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i++; pn = nd; |
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prev = vma->vm_start; pend = vma->vm_end; |
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} j = 0; |
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for (nd = pn; nd; nd = rb_prev(nd)) |
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326 |
j++; |
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327 |
if (i != j) { |
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pr_emerg("backwards %d, forwards %d ", j, i); |
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bug = 1; |
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} |
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return bug ? -1 : i; |
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} |
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static void validate_mm_rb(struct rb_root *root, struct vm_area_struct *ignore) { struct rb_node *nd; for (nd = rb_first(root); nd; nd = rb_next(nd)) { struct vm_area_struct *vma; vma = rb_entry(nd, struct vm_area_struct, vm_rb); |
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VM_BUG_ON_VMA(vma != ignore && vma->rb_subtree_gap != vma_compute_subtree_gap(vma), vma); |
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344 |
} |
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345 |
} |
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346 |
static void validate_mm(struct mm_struct *mm) |
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{ int bug = 0; int i = 0; |
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unsigned long highest_address = 0; |
ed8ea8150 mm: add CONFIG_DE... |
351 |
struct vm_area_struct *vma = mm->mmap; |
ff26f70f4 mm/mmap.c: clean ... |
352 |
|
ed8ea8150 mm: add CONFIG_DE... |
353 |
while (vma) { |
12352d3ca mm: replace vma_l... |
354 |
struct anon_vma *anon_vma = vma->anon_vma; |
ed8ea8150 mm: add CONFIG_DE... |
355 |
struct anon_vma_chain *avc; |
ff26f70f4 mm/mmap.c: clean ... |
356 |
|
12352d3ca mm: replace vma_l... |
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if (anon_vma) { anon_vma_lock_read(anon_vma); list_for_each_entry(avc, &vma->anon_vma_chain, same_vma) anon_vma_interval_tree_verify(avc); anon_vma_unlock_read(anon_vma); } |
1be7107fb mm: larger stack ... |
363 |
highest_address = vm_end_gap(vma); |
ed8ea8150 mm: add CONFIG_DE... |
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vma = vma->vm_next; |
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i++; } |
5a0768f64 mm: check rb_subt... |
367 |
if (i != mm->map_count) { |
8542bdfc6 mm/mmap.c: use pr... |
368 369 |
pr_emerg("map_count %d vm_next %d ", mm->map_count, i); |
5a0768f64 mm: check rb_subt... |
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bug = 1; } if (highest_address != mm->highest_vm_end) { |
8542bdfc6 mm/mmap.c: use pr... |
373 374 |
pr_emerg("mm->highest_vm_end %lx, found %lx ", |
ff26f70f4 mm/mmap.c: clean ... |
375 |
mm->highest_vm_end, highest_address); |
5a0768f64 mm: check rb_subt... |
376 377 |
bug = 1; } |
acf128d04 mm: validate_mm b... |
378 |
i = browse_rb(mm); |
5a0768f64 mm: check rb_subt... |
379 |
if (i != mm->map_count) { |
ff26f70f4 mm/mmap.c: clean ... |
380 381 382 |
if (i != -1) pr_emerg("map_count %d rb %d ", mm->map_count, i); |
5a0768f64 mm: check rb_subt... |
383 384 |
bug = 1; } |
96dad67ff mm: use VM_BUG_ON... |
385 |
VM_BUG_ON_MM(bug, mm); |
1da177e4c Linux-2.6.12-rc2 |
386 387 |
} #else |
d37371870 mm: augment vma r... |
388 |
#define validate_mm_rb(root, ignore) do { } while (0) |
1da177e4c Linux-2.6.12-rc2 |
389 390 |
#define validate_mm(mm) do { } while (0) #endif |
d37371870 mm: augment vma r... |
391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 |
RB_DECLARE_CALLBACKS(static, vma_gap_callbacks, struct vm_area_struct, vm_rb, unsigned long, rb_subtree_gap, vma_compute_subtree_gap) /* * Update augmented rbtree rb_subtree_gap values after vma->vm_start or * vma->vm_prev->vm_end values changed, without modifying the vma's position * in the rbtree. */ static void vma_gap_update(struct vm_area_struct *vma) { /* * As it turns out, RB_DECLARE_CALLBACKS() already created a callback * function that does exacltly what we want. */ vma_gap_callbacks_propagate(&vma->vm_rb, NULL); } static inline void vma_rb_insert(struct vm_area_struct *vma, struct rb_root *root) { /* All rb_subtree_gap values must be consistent prior to insertion */ validate_mm_rb(root, NULL); rb_insert_augmented(&vma->vm_rb, root, &vma_gap_callbacks); } |
8f26e0b17 mm: vma_merge: co... |
416 |
static void __vma_rb_erase(struct vm_area_struct *vma, struct rb_root *root) |
d37371870 mm: augment vma r... |
417 418 |
{ /* |
d37371870 mm: augment vma r... |
419 420 421 422 423 424 |
* Note rb_erase_augmented is a fairly large inline function, * so make sure we instantiate it only once with our desired * augmented rbtree callbacks. */ rb_erase_augmented(&vma->vm_rb, root, &vma_gap_callbacks); } |
8f26e0b17 mm: vma_merge: co... |
425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 |
static __always_inline void vma_rb_erase_ignore(struct vm_area_struct *vma, struct rb_root *root, struct vm_area_struct *ignore) { /* * All rb_subtree_gap values must be consistent prior to erase, * with the possible exception of the "next" vma being erased if * next->vm_start was reduced. */ validate_mm_rb(root, ignore); __vma_rb_erase(vma, root); } static __always_inline void vma_rb_erase(struct vm_area_struct *vma, struct rb_root *root) { /* * All rb_subtree_gap values must be consistent prior to erase, * with the possible exception of the vma being erased. */ validate_mm_rb(root, vma); __vma_rb_erase(vma, root); } |
bf181b9f9 mm anon rmap: rep... |
450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 |
/* * vma has some anon_vma assigned, and is already inserted on that * anon_vma's interval trees. * * Before updating the vma's vm_start / vm_end / vm_pgoff fields, the * vma must be removed from the anon_vma's interval trees using * anon_vma_interval_tree_pre_update_vma(). * * After the update, the vma will be reinserted using * anon_vma_interval_tree_post_update_vma(). * * The entire update must be protected by exclusive mmap_sem and by * the root anon_vma's mutex. */ static inline void anon_vma_interval_tree_pre_update_vma(struct vm_area_struct *vma) { struct anon_vma_chain *avc; list_for_each_entry(avc, &vma->anon_vma_chain, same_vma) anon_vma_interval_tree_remove(avc, &avc->anon_vma->rb_root); } static inline void anon_vma_interval_tree_post_update_vma(struct vm_area_struct *vma) { struct anon_vma_chain *avc; list_for_each_entry(avc, &vma->anon_vma_chain, same_vma) anon_vma_interval_tree_insert(avc, &avc->anon_vma->rb_root); } |
6597d7833 mm/mmap.c: replac... |
481 482 483 |
static int find_vma_links(struct mm_struct *mm, unsigned long addr, unsigned long end, struct vm_area_struct **pprev, struct rb_node ***rb_link, struct rb_node **rb_parent) |
1da177e4c Linux-2.6.12-rc2 |
484 |
{ |
6597d7833 mm/mmap.c: replac... |
485 |
struct rb_node **__rb_link, *__rb_parent, *rb_prev; |
1da177e4c Linux-2.6.12-rc2 |
486 487 488 |
__rb_link = &mm->mm_rb.rb_node; rb_prev = __rb_parent = NULL; |
1da177e4c Linux-2.6.12-rc2 |
489 490 491 492 493 494 495 496 |
while (*__rb_link) { struct vm_area_struct *vma_tmp; __rb_parent = *__rb_link; vma_tmp = rb_entry(__rb_parent, struct vm_area_struct, vm_rb); if (vma_tmp->vm_end > addr) { |
6597d7833 mm/mmap.c: replac... |
497 498 499 |
/* Fail if an existing vma overlaps the area */ if (vma_tmp->vm_start < end) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
500 501 502 503 504 505 506 507 508 509 510 511 |
__rb_link = &__rb_parent->rb_left; } else { rb_prev = __rb_parent; __rb_link = &__rb_parent->rb_right; } } *pprev = NULL; if (rb_prev) *pprev = rb_entry(rb_prev, struct vm_area_struct, vm_rb); *rb_link = __rb_link; *rb_parent = __rb_parent; |
6597d7833 mm/mmap.c: replac... |
512 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
513 |
} |
e8420a8ec mm/mmap: check fo... |
514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 |
static unsigned long count_vma_pages_range(struct mm_struct *mm, unsigned long addr, unsigned long end) { unsigned long nr_pages = 0; struct vm_area_struct *vma; /* Find first overlaping mapping */ vma = find_vma_intersection(mm, addr, end); if (!vma) return 0; nr_pages = (min(end, vma->vm_end) - max(addr, vma->vm_start)) >> PAGE_SHIFT; /* Iterate over the rest of the overlaps */ for (vma = vma->vm_next; vma; vma = vma->vm_next) { unsigned long overlap_len; if (vma->vm_start > end) break; overlap_len = min(end, vma->vm_end) - vma->vm_start; nr_pages += overlap_len >> PAGE_SHIFT; } return nr_pages; } |
1da177e4c Linux-2.6.12-rc2 |
541 542 543 |
void __vma_link_rb(struct mm_struct *mm, struct vm_area_struct *vma, struct rb_node **rb_link, struct rb_node *rb_parent) { |
d37371870 mm: augment vma r... |
544 545 546 547 |
/* Update tracking information for the gap following the new vma. */ if (vma->vm_next) vma_gap_update(vma->vm_next); else |
1be7107fb mm: larger stack ... |
548 |
mm->highest_vm_end = vm_end_gap(vma); |
d37371870 mm: augment vma r... |
549 550 551 552 553 554 555 556 557 558 |
/* * vma->vm_prev wasn't known when we followed the rbtree to find the * correct insertion point for that vma. As a result, we could not * update the vma vm_rb parents rb_subtree_gap values on the way down. * So, we first insert the vma with a zero rb_subtree_gap value * (to be consistent with what we did on the way down), and then * immediately update the gap to the correct value. Finally we * rebalance the rbtree after all augmented values have been set. */ |
1da177e4c Linux-2.6.12-rc2 |
559 |
rb_link_node(&vma->vm_rb, rb_parent, rb_link); |
d37371870 mm: augment vma r... |
560 561 562 |
vma->rb_subtree_gap = 0; vma_gap_update(vma); vma_rb_insert(vma, &mm->mm_rb); |
1da177e4c Linux-2.6.12-rc2 |
563 |
} |
cb8f488c3 mmap.c: deinline ... |
564 |
static void __vma_link_file(struct vm_area_struct *vma) |
1da177e4c Linux-2.6.12-rc2 |
565 |
{ |
48aae4255 mm/mmap.c: fix co... |
566 |
struct file *file; |
1da177e4c Linux-2.6.12-rc2 |
567 568 569 570 571 572 |
file = vma->vm_file; if (file) { struct address_space *mapping = file->f_mapping; if (vma->vm_flags & VM_DENYWRITE) |
496ad9aa8 new helper: file_... |
573 |
atomic_dec(&file_inode(file)->i_writecount); |
1da177e4c Linux-2.6.12-rc2 |
574 |
if (vma->vm_flags & VM_SHARED) |
4bb5f5d93 mm: allow drivers... |
575 |
atomic_inc(&mapping->i_mmap_writable); |
1da177e4c Linux-2.6.12-rc2 |
576 577 |
flush_dcache_mmap_lock(mapping); |
27ba0644e rmap: drop suppor... |
578 |
vma_interval_tree_insert(vma, &mapping->i_mmap); |
1da177e4c Linux-2.6.12-rc2 |
579 580 581 582 583 584 585 586 587 588 589 |
flush_dcache_mmap_unlock(mapping); } } static void __vma_link(struct mm_struct *mm, struct vm_area_struct *vma, struct vm_area_struct *prev, struct rb_node **rb_link, struct rb_node *rb_parent) { __vma_link_list(mm, vma, prev, rb_parent); __vma_link_rb(mm, vma, rb_link, rb_parent); |
1da177e4c Linux-2.6.12-rc2 |
590 591 592 593 594 595 596 |
} static void vma_link(struct mm_struct *mm, struct vm_area_struct *vma, struct vm_area_struct *prev, struct rb_node **rb_link, struct rb_node *rb_parent) { struct address_space *mapping = NULL; |
64ac4940d mm/mmap.c: remove... |
597 |
if (vma->vm_file) { |
1da177e4c Linux-2.6.12-rc2 |
598 |
mapping = vma->vm_file->f_mapping; |
83cde9e8b mm: use new helpe... |
599 |
i_mmap_lock_write(mapping); |
64ac4940d mm/mmap.c: remove... |
600 |
} |
1da177e4c Linux-2.6.12-rc2 |
601 602 603 |
__vma_link(mm, vma, prev, rb_link, rb_parent); __vma_link_file(vma); |
1da177e4c Linux-2.6.12-rc2 |
604 |
if (mapping) |
83cde9e8b mm: use new helpe... |
605 |
i_mmap_unlock_write(mapping); |
1da177e4c Linux-2.6.12-rc2 |
606 607 608 609 610 611 |
mm->map_count++; validate_mm(mm); } /* |
88f6b4c32 mmap.c: fix comme... |
612 |
* Helper for vma_adjust() in the split_vma insert case: insert a vma into the |
6b2dbba8b mm: replace vma p... |
613 |
* mm's list and rbtree. It has already been inserted into the interval tree. |
1da177e4c Linux-2.6.12-rc2 |
614 |
*/ |
48aae4255 mm/mmap.c: fix co... |
615 |
static void __insert_vm_struct(struct mm_struct *mm, struct vm_area_struct *vma) |
1da177e4c Linux-2.6.12-rc2 |
616 |
{ |
6597d7833 mm/mmap.c: replac... |
617 |
struct vm_area_struct *prev; |
48aae4255 mm/mmap.c: fix co... |
618 |
struct rb_node **rb_link, *rb_parent; |
1da177e4c Linux-2.6.12-rc2 |
619 |
|
6597d7833 mm/mmap.c: replac... |
620 621 622 |
if (find_vma_links(mm, vma->vm_start, vma->vm_end, &prev, &rb_link, &rb_parent)) BUG(); |
1da177e4c Linux-2.6.12-rc2 |
623 624 625 |
__vma_link(mm, vma, prev, rb_link, rb_parent); mm->map_count++; } |
e86f15ee6 mm: vma_merge: fi... |
626 627 628 |
static __always_inline void __vma_unlink_common(struct mm_struct *mm, struct vm_area_struct *vma, struct vm_area_struct *prev, |
8f26e0b17 mm: vma_merge: co... |
629 630 |
bool has_prev, struct vm_area_struct *ignore) |
1da177e4c Linux-2.6.12-rc2 |
631 |
{ |
d37371870 mm: augment vma r... |
632 |
struct vm_area_struct *next; |
297c5eee3 mm: make the vma ... |
633 |
|
8f26e0b17 mm: vma_merge: co... |
634 |
vma_rb_erase_ignore(vma, &mm->mm_rb, ignore); |
e86f15ee6 mm: vma_merge: fi... |
635 636 637 638 639 640 641 642 643 644 |
next = vma->vm_next; if (has_prev) prev->vm_next = next; else { prev = vma->vm_prev; if (prev) prev->vm_next = next; else mm->mmap = next; } |
297c5eee3 mm: make the vma ... |
645 646 |
if (next) next->vm_prev = prev; |
615d6e875 mm: per-thread vm... |
647 648 649 |
/* Kill the cache */ vmacache_invalidate(mm); |
1da177e4c Linux-2.6.12-rc2 |
650 |
} |
e86f15ee6 mm: vma_merge: fi... |
651 652 653 654 |
static inline void __vma_unlink_prev(struct mm_struct *mm, struct vm_area_struct *vma, struct vm_area_struct *prev) { |
8f26e0b17 mm: vma_merge: co... |
655 |
__vma_unlink_common(mm, vma, prev, true, vma); |
e86f15ee6 mm: vma_merge: fi... |
656 |
} |
1da177e4c Linux-2.6.12-rc2 |
657 658 659 660 661 662 663 |
/* * We cannot adjust vm_start, vm_end, vm_pgoff fields of a vma that * is already present in an i_mmap tree without adjusting the tree. * The following helper function should be used when such adjustments * are necessary. The "insert" vma (if any) is to be inserted * before we drop the necessary locks. */ |
e86f15ee6 mm: vma_merge: fi... |
664 665 666 |
int __vma_adjust(struct vm_area_struct *vma, unsigned long start, unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert, struct vm_area_struct *expand) |
1da177e4c Linux-2.6.12-rc2 |
667 668 |
{ struct mm_struct *mm = vma->vm_mm; |
e86f15ee6 mm: vma_merge: fi... |
669 |
struct vm_area_struct *next = vma->vm_next, *orig_vma = vma; |
1da177e4c Linux-2.6.12-rc2 |
670 |
struct address_space *mapping = NULL; |
f808c13fd lib/interval_tree... |
671 |
struct rb_root_cached *root = NULL; |
012f18004 mm: always lock t... |
672 |
struct anon_vma *anon_vma = NULL; |
1da177e4c Linux-2.6.12-rc2 |
673 |
struct file *file = vma->vm_file; |
d37371870 mm: augment vma r... |
674 |
bool start_changed = false, end_changed = false; |
1da177e4c Linux-2.6.12-rc2 |
675 676 677 678 |
long adjust_next = 0; int remove_next = 0; if (next && !insert) { |
734537c9c mm: fix use-after... |
679 |
struct vm_area_struct *exporter = NULL, *importer = NULL; |
287d97ac0 vma_adjust: fix t... |
680 |
|
1da177e4c Linux-2.6.12-rc2 |
681 682 683 684 |
if (end >= next->vm_end) { /* * vma expands, overlapping all the next, and * perhaps the one after too (mprotect case 6). |
86d12e471 mm: vma_adjust: m... |
685 |
* The only other cases that gets here are |
e86f15ee6 mm: vma_merge: fi... |
686 |
* case 1, case 7 and case 8. |
1da177e4c Linux-2.6.12-rc2 |
687 |
*/ |
e86f15ee6 mm: vma_merge: fi... |
688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 |
if (next == expand) { /* * The only case where we don't expand "vma" * and we expand "next" instead is case 8. */ VM_WARN_ON(end != next->vm_end); /* * remove_next == 3 means we're * removing "vma" and that to do so we * swapped "vma" and "next". */ remove_next = 3; VM_WARN_ON(file != next->vm_file); swap(vma, next); } else { VM_WARN_ON(expand != vma); /* * case 1, 6, 7, remove_next == 2 is case 6, * remove_next == 1 is case 1 or 7. */ remove_next = 1 + (end > next->vm_end); VM_WARN_ON(remove_next == 2 && end != next->vm_next->vm_end); VM_WARN_ON(remove_next == 1 && end != next->vm_end); /* trim end to next, for case 6 first pass */ end = next->vm_end; } |
287d97ac0 vma_adjust: fix t... |
716 |
exporter = next; |
1da177e4c Linux-2.6.12-rc2 |
717 |
importer = vma; |
734537c9c mm: fix use-after... |
718 719 720 721 722 |
/* * If next doesn't have anon_vma, import from vma after * next, if the vma overlaps with it. */ |
97a42cd43 mm: vma_adjust: r... |
723 |
if (remove_next == 2 && !next->anon_vma) |
734537c9c mm: fix use-after... |
724 |
exporter = next->vm_next; |
1da177e4c Linux-2.6.12-rc2 |
725 726 727 728 729 730 |
} else if (end > next->vm_start) { /* * vma expands, overlapping part of the next: * mprotect case 5 shifting the boundary up. */ adjust_next = (end - next->vm_start) >> PAGE_SHIFT; |
287d97ac0 vma_adjust: fix t... |
731 |
exporter = next; |
1da177e4c Linux-2.6.12-rc2 |
732 |
importer = vma; |
e86f15ee6 mm: vma_merge: fi... |
733 |
VM_WARN_ON(expand != importer); |
1da177e4c Linux-2.6.12-rc2 |
734 735 736 737 738 739 |
} else if (end < vma->vm_end) { /* * vma shrinks, and !insert tells it's not * split_vma inserting another: so it must be * mprotect case 4 shifting the boundary down. */ |
cc71aba34 mm/mmap.c: whites... |
740 |
adjust_next = -((vma->vm_end - end) >> PAGE_SHIFT); |
287d97ac0 vma_adjust: fix t... |
741 |
exporter = vma; |
1da177e4c Linux-2.6.12-rc2 |
742 |
importer = next; |
e86f15ee6 mm: vma_merge: fi... |
743 |
VM_WARN_ON(expand != importer); |
1da177e4c Linux-2.6.12-rc2 |
744 |
} |
1da177e4c Linux-2.6.12-rc2 |
745 |
|
5beb49305 mm: change anon_v... |
746 747 748 749 750 |
/* * Easily overlooked: when mprotect shifts the boundary, * make sure the expanding vma has anon_vma set if the * shrinking vma had, to cover any anon pages imported. */ |
287d97ac0 vma_adjust: fix t... |
751 |
if (exporter && exporter->anon_vma && !importer->anon_vma) { |
c4ea95d7c mm: fix anon_vma_... |
752 |
int error; |
b800c91a0 mm: fix corner ca... |
753 |
importer->anon_vma = exporter->anon_vma; |
c4ea95d7c mm: fix anon_vma_... |
754 |
error = anon_vma_clone(importer, exporter); |
3fe89b3e2 mm: fix anon_vma-... |
755 |
if (error) |
c4ea95d7c mm: fix anon_vma_... |
756 |
return error; |
5beb49305 mm: change anon_v... |
757 758 |
} } |
734537c9c mm: fix use-after... |
759 |
again: |
e86f15ee6 mm: vma_merge: fi... |
760 |
vma_adjust_trans_huge(orig_vma, start, end, adjust_next); |
37f9f5595 thp: run vma_adju... |
761 |
|
1da177e4c Linux-2.6.12-rc2 |
762 763 |
if (file) { mapping = file->f_mapping; |
27ba0644e rmap: drop suppor... |
764 765 |
root = &mapping->i_mmap; uprobe_munmap(vma, vma->vm_start, vma->vm_end); |
682968e0c uprobes/core: Opt... |
766 |
|
27ba0644e rmap: drop suppor... |
767 768 |
if (adjust_next) uprobe_munmap(next, next->vm_start, next->vm_end); |
682968e0c uprobes/core: Opt... |
769 |
|
83cde9e8b mm: use new helpe... |
770 |
i_mmap_lock_write(mapping); |
1da177e4c Linux-2.6.12-rc2 |
771 |
if (insert) { |
1da177e4c Linux-2.6.12-rc2 |
772 |
/* |
6b2dbba8b mm: replace vma p... |
773 |
* Put into interval tree now, so instantiated pages |
1da177e4c Linux-2.6.12-rc2 |
774 775 776 777 778 779 780 |
* are visible to arm/parisc __flush_dcache_page * throughout; but we cannot insert into address * space until vma start or end is updated. */ __vma_link_file(insert); } } |
bf181b9f9 mm anon rmap: rep... |
781 782 783 784 |
anon_vma = vma->anon_vma; if (!anon_vma && adjust_next) anon_vma = next->anon_vma; if (anon_vma) { |
e86f15ee6 mm: vma_merge: fi... |
785 786 |
VM_WARN_ON(adjust_next && next->anon_vma && anon_vma != next->anon_vma); |
4fc3f1d66 mm/rmap, migratio... |
787 |
anon_vma_lock_write(anon_vma); |
bf181b9f9 mm anon rmap: rep... |
788 789 790 791 |
anon_vma_interval_tree_pre_update_vma(vma); if (adjust_next) anon_vma_interval_tree_pre_update_vma(next); } |
012f18004 mm: always lock t... |
792 |
|
1da177e4c Linux-2.6.12-rc2 |
793 794 |
if (root) { flush_dcache_mmap_lock(mapping); |
6b2dbba8b mm: replace vma p... |
795 |
vma_interval_tree_remove(vma, root); |
1da177e4c Linux-2.6.12-rc2 |
796 |
if (adjust_next) |
6b2dbba8b mm: replace vma p... |
797 |
vma_interval_tree_remove(next, root); |
1da177e4c Linux-2.6.12-rc2 |
798 |
} |
d37371870 mm: augment vma r... |
799 800 801 802 803 804 805 806 |
if (start != vma->vm_start) { vma->vm_start = start; start_changed = true; } if (end != vma->vm_end) { vma->vm_end = end; end_changed = true; } |
1da177e4c Linux-2.6.12-rc2 |
807 808 809 810 811 812 813 814 |
vma->vm_pgoff = pgoff; if (adjust_next) { next->vm_start += adjust_next << PAGE_SHIFT; next->vm_pgoff += adjust_next; } if (root) { if (adjust_next) |
6b2dbba8b mm: replace vma p... |
815 816 |
vma_interval_tree_insert(next, root); vma_interval_tree_insert(vma, root); |
1da177e4c Linux-2.6.12-rc2 |
817 818 819 820 821 822 823 824 |
flush_dcache_mmap_unlock(mapping); } if (remove_next) { /* * vma_merge has merged next into vma, and needs * us to remove next before dropping the locks. */ |
e86f15ee6 mm: vma_merge: fi... |
825 826 827 |
if (remove_next != 3) __vma_unlink_prev(mm, next, vma); else |
8f26e0b17 mm: vma_merge: co... |
828 829 830 831 832 833 834 835 836 837 |
/* * vma is not before next if they've been * swapped. * * pre-swap() next->vm_start was reduced so * tell validate_mm_rb to ignore pre-swap() * "next" (which is stored in post-swap() * "vma"). */ __vma_unlink_common(mm, next, NULL, false, vma); |
1da177e4c Linux-2.6.12-rc2 |
838 839 |
if (file) __remove_shared_vm_struct(next, file, mapping); |
1da177e4c Linux-2.6.12-rc2 |
840 841 842 843 844 845 846 |
} else if (insert) { /* * split_vma has split insert from vma, and needs * us to insert it before dropping the locks * (it may either follow vma or precede it). */ __insert_vm_struct(mm, insert); |
d37371870 mm: augment vma r... |
847 848 849 850 851 |
} else { if (start_changed) vma_gap_update(vma); if (end_changed) { if (!next) |
1be7107fb mm: larger stack ... |
852 |
mm->highest_vm_end = vm_end_gap(vma); |
d37371870 mm: augment vma r... |
853 854 855 |
else if (!adjust_next) vma_gap_update(next); } |
1da177e4c Linux-2.6.12-rc2 |
856 |
} |
bf181b9f9 mm anon rmap: rep... |
857 858 859 860 |
if (anon_vma) { anon_vma_interval_tree_post_update_vma(vma); if (adjust_next) anon_vma_interval_tree_post_update_vma(next); |
08b52706d mm/rmap: rename a... |
861 |
anon_vma_unlock_write(anon_vma); |
bf181b9f9 mm anon rmap: rep... |
862 |
} |
1da177e4c Linux-2.6.12-rc2 |
863 |
if (mapping) |
83cde9e8b mm: use new helpe... |
864 |
i_mmap_unlock_write(mapping); |
1da177e4c Linux-2.6.12-rc2 |
865 |
|
2b1444983 uprobes, mm, x86:... |
866 |
if (root) { |
7b2d81d48 uprobes/core: Cle... |
867 |
uprobe_mmap(vma); |
2b1444983 uprobes, mm, x86:... |
868 869 |
if (adjust_next) |
7b2d81d48 uprobes/core: Cle... |
870 |
uprobe_mmap(next); |
2b1444983 uprobes, mm, x86:... |
871 |
} |
1da177e4c Linux-2.6.12-rc2 |
872 |
if (remove_next) { |
925d1c401 procfs task exe s... |
873 |
if (file) { |
cbc91f71b uprobes/core: Dec... |
874 |
uprobe_munmap(next, next->vm_start, next->vm_end); |
1da177e4c Linux-2.6.12-rc2 |
875 |
fput(file); |
925d1c401 procfs task exe s... |
876 |
} |
5beb49305 mm: change anon_v... |
877 878 |
if (next->anon_vma) anon_vma_merge(vma, next); |
1da177e4c Linux-2.6.12-rc2 |
879 |
mm->map_count--; |
3964acd0d mm: mempolicy: fi... |
880 |
mpol_put(vma_policy(next)); |
3928d4f5e mm: use helper fu... |
881 |
vm_area_free(next); |
1da177e4c Linux-2.6.12-rc2 |
882 883 884 885 886 |
/* * In mprotect's case 6 (see comments on vma_merge), * we must remove another next too. It would clutter * up the code too much to do both in one go. */ |
e86f15ee6 mm: vma_merge: fi... |
887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 |
if (remove_next != 3) { /* * If "next" was removed and vma->vm_end was * expanded (up) over it, in turn * "next->vm_prev->vm_end" changed and the * "vma->vm_next" gap must be updated. */ next = vma->vm_next; } else { /* * For the scope of the comment "next" and * "vma" considered pre-swap(): if "vma" was * removed, next->vm_start was expanded (down) * over it and the "next" gap must be updated. * Because of the swap() the post-swap() "vma" * actually points to pre-swap() "next" * (post-swap() "next" as opposed is now a * dangling pointer). */ next = vma; } |
734537c9c mm: fix use-after... |
908 909 910 |
if (remove_next == 2) { remove_next = 1; end = next->vm_end; |
1da177e4c Linux-2.6.12-rc2 |
911 |
goto again; |
734537c9c mm: fix use-after... |
912 |
} |
d37371870 mm: augment vma r... |
913 914 |
else if (next) vma_gap_update(next); |
fb8c41e9a mm: vma_adjust: r... |
915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 |
else { /* * If remove_next == 2 we obviously can't * reach this path. * * If remove_next == 3 we can't reach this * path because pre-swap() next is always not * NULL. pre-swap() "next" is not being * removed and its next->vm_end is not altered * (and furthermore "end" already matches * next->vm_end in remove_next == 3). * * We reach this only in the remove_next == 1 * case if the "next" vma that was removed was * the highest vma of the mm. However in such * case next->vm_end == "end" and the extended * "vma" has vma->vm_end == next->vm_end so * mm->highest_vm_end doesn't need any update * in remove_next == 1 case. */ |
1be7107fb mm: larger stack ... |
935 |
VM_WARN_ON(mm->highest_vm_end != vm_end_gap(vma)); |
fb8c41e9a mm: vma_adjust: r... |
936 |
} |
1da177e4c Linux-2.6.12-rc2 |
937 |
} |
2b1444983 uprobes, mm, x86:... |
938 |
if (insert && file) |
7b2d81d48 uprobes/core: Cle... |
939 |
uprobe_mmap(insert); |
1da177e4c Linux-2.6.12-rc2 |
940 941 |
validate_mm(mm); |
5beb49305 mm: change anon_v... |
942 943 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
944 945 946 947 948 949 |
} /* * If the vma has a ->close operation then the driver probably needs to release * per-vma resources, so we don't attempt to merge those. */ |
1da177e4c Linux-2.6.12-rc2 |
950 |
static inline int is_mergeable_vma(struct vm_area_struct *vma, |
19a809afe userfaultfd: teac... |
951 952 |
struct file *file, unsigned long vm_flags, struct vm_userfaultfd_ctx vm_userfaultfd_ctx) |
1da177e4c Linux-2.6.12-rc2 |
953 |
{ |
34228d473 mm: ignore VM_SOF... |
954 955 956 957 958 959 960 961 962 |
/* * VM_SOFTDIRTY should not prevent from VMA merging, if we * match the flags but dirty bit -- the caller should mark * merged VMA as dirty. If dirty bit won't be excluded from * comparison, we increase pressue on the memory system forcing * the kernel to generate new VMAs when old one could be * extended instead. */ if ((vma->vm_flags ^ vm_flags) & ~VM_SOFTDIRTY) |
1da177e4c Linux-2.6.12-rc2 |
963 964 965 966 967 |
return 0; if (vma->vm_file != file) return 0; if (vma->vm_ops && vma->vm_ops->close) return 0; |
19a809afe userfaultfd: teac... |
968 969 |
if (!is_mergeable_vm_userfaultfd_ctx(vma, vm_userfaultfd_ctx)) return 0; |
1da177e4c Linux-2.6.12-rc2 |
970 971 972 973 |
return 1; } static inline int is_mergeable_anon_vma(struct anon_vma *anon_vma1, |
965f55dea mmap: avoid mergi... |
974 975 |
struct anon_vma *anon_vma2, struct vm_area_struct *vma) |
1da177e4c Linux-2.6.12-rc2 |
976 |
{ |
965f55dea mmap: avoid mergi... |
977 978 979 980 981 982 983 984 |
/* * The list_is_singular() test is to avoid merging VMA cloned from * parents. This can improve scalability caused by anon_vma lock. */ if ((!anon_vma1 || !anon_vma2) && (!vma || list_is_singular(&vma->anon_vma_chain))) return 1; return anon_vma1 == anon_vma2; |
1da177e4c Linux-2.6.12-rc2 |
985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 |
} /* * Return true if we can merge this (vm_flags,anon_vma,file,vm_pgoff) * in front of (at a lower virtual address and file offset than) the vma. * * We cannot merge two vmas if they have differently assigned (non-NULL) * anon_vmas, nor if same anon_vma is assigned but offsets incompatible. * * We don't check here for the merged mmap wrapping around the end of pagecache * indices (16TB on ia32) because do_mmap_pgoff() does not permit mmap's which * wrap, nor mmaps which cover the final page at index -1UL. */ static int can_vma_merge_before(struct vm_area_struct *vma, unsigned long vm_flags, |
19a809afe userfaultfd: teac... |
1000 1001 1002 |
struct anon_vma *anon_vma, struct file *file, pgoff_t vm_pgoff, struct vm_userfaultfd_ctx vm_userfaultfd_ctx) |
1da177e4c Linux-2.6.12-rc2 |
1003 |
{ |
19a809afe userfaultfd: teac... |
1004 |
if (is_mergeable_vma(vma, file, vm_flags, vm_userfaultfd_ctx) && |
965f55dea mmap: avoid mergi... |
1005 |
is_mergeable_anon_vma(anon_vma, vma->anon_vma, vma)) { |
1da177e4c Linux-2.6.12-rc2 |
1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 |
if (vma->vm_pgoff == vm_pgoff) return 1; } return 0; } /* * Return true if we can merge this (vm_flags,anon_vma,file,vm_pgoff) * beyond (at a higher virtual address and file offset than) the vma. * * We cannot merge two vmas if they have differently assigned (non-NULL) * anon_vmas, nor if same anon_vma is assigned but offsets incompatible. */ static int can_vma_merge_after(struct vm_area_struct *vma, unsigned long vm_flags, |
19a809afe userfaultfd: teac... |
1021 1022 1023 |
struct anon_vma *anon_vma, struct file *file, pgoff_t vm_pgoff, struct vm_userfaultfd_ctx vm_userfaultfd_ctx) |
1da177e4c Linux-2.6.12-rc2 |
1024 |
{ |
19a809afe userfaultfd: teac... |
1025 |
if (is_mergeable_vma(vma, file, vm_flags, vm_userfaultfd_ctx) && |
965f55dea mmap: avoid mergi... |
1026 |
is_mergeable_anon_vma(anon_vma, vma->anon_vma, vma)) { |
1da177e4c Linux-2.6.12-rc2 |
1027 |
pgoff_t vm_pglen; |
d6e932177 mm: use vma_pages... |
1028 |
vm_pglen = vma_pages(vma); |
1da177e4c Linux-2.6.12-rc2 |
1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 |
if (vma->vm_pgoff + vm_pglen == vm_pgoff) return 1; } return 0; } /* * Given a mapping request (addr,end,vm_flags,file,pgoff), figure out * whether that can be merged with its predecessor or its successor. * Or both (it neatly fills a hole). * * In most cases - when called for mmap, brk or mremap - [addr,end) is * certain not to be mapped by the time vma_merge is called; but when * called for mprotect, it is certain to be already mapped (either at * an offset within prev, or at the start of next), and the flags of * this area are about to be changed to vm_flags - and the no-change * case has already been eliminated. * * The following mprotect cases have to be considered, where AAAA is * the area passed down from mprotect_fixup, never extending beyond one * vma, PPPPPP is the prev vma specified, and NNNNNN the next vma after: * * AAAA AAAA AAAA AAAA * PPPPPPNNNNNN PPPPPPNNNNNN PPPPPPNNNNNN PPPPNNNNXXXX * cannot merge might become might become might become * PPNNNNNNNNNN PPPPPPPPPPNN PPPPPPPPPPPP 6 or * mmap, brk or case 4 below case 5 below PPPPPPPPXXXX 7 or |
e86f15ee6 mm: vma_merge: fi... |
1056 |
* mremap move: PPPPXXXXXXXX 8 |
1da177e4c Linux-2.6.12-rc2 |
1057 1058 1059 1060 |
* AAAA * PPPP NNNN PPPPPPPPPPPP PPPPPPPPNNNN PPPPNNNNNNNN * might become case 1 below case 2 below case 3 below * |
e86f15ee6 mm: vma_merge: fi... |
1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 |
* It is important for case 8 that the the vma NNNN overlapping the * region AAAA is never going to extended over XXXX. Instead XXXX must * be extended in region AAAA and NNNN must be removed. This way in * all cases where vma_merge succeeds, the moment vma_adjust drops the * rmap_locks, the properties of the merged vma will be already * correct for the whole merged range. Some of those properties like * vm_page_prot/vm_flags may be accessed by rmap_walks and they must * be correct for the whole merged range immediately after the * rmap_locks are released. Otherwise if XXXX would be removed and * NNNN would be extended over the XXXX range, remove_migration_ptes * or other rmap walkers (if working on addresses beyond the "end" * parameter) may establish ptes with the wrong permissions of NNNN * instead of the right permissions of XXXX. |
1da177e4c Linux-2.6.12-rc2 |
1074 1075 1076 1077 |
*/ struct vm_area_struct *vma_merge(struct mm_struct *mm, struct vm_area_struct *prev, unsigned long addr, unsigned long end, unsigned long vm_flags, |
cc71aba34 mm/mmap.c: whites... |
1078 |
struct anon_vma *anon_vma, struct file *file, |
19a809afe userfaultfd: teac... |
1079 1080 |
pgoff_t pgoff, struct mempolicy *policy, struct vm_userfaultfd_ctx vm_userfaultfd_ctx) |
1da177e4c Linux-2.6.12-rc2 |
1081 1082 1083 |
{ pgoff_t pglen = (end - addr) >> PAGE_SHIFT; struct vm_area_struct *area, *next; |
5beb49305 mm: change anon_v... |
1084 |
int err; |
1da177e4c Linux-2.6.12-rc2 |
1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 |
/* * We later require that vma->vm_flags == vm_flags, * so this tests vma->vm_flags & VM_SPECIAL, too. */ if (vm_flags & VM_SPECIAL) return NULL; if (prev) next = prev->vm_next; else next = mm->mmap; area = next; |
e86f15ee6 mm: vma_merge: fi... |
1098 |
if (area && area->vm_end == end) /* cases 6, 7, 8 */ |
1da177e4c Linux-2.6.12-rc2 |
1099 |
next = next->vm_next; |
e86f15ee6 mm: vma_merge: fi... |
1100 1101 1102 1103 |
/* verify some invariant that must be enforced by the caller */ VM_WARN_ON(prev && addr <= prev->vm_start); VM_WARN_ON(area && end > area->vm_end); VM_WARN_ON(addr >= end); |
1da177e4c Linux-2.6.12-rc2 |
1104 1105 1106 1107 |
/* * Can it merge with the predecessor? */ if (prev && prev->vm_end == addr && |
cc71aba34 mm/mmap.c: whites... |
1108 |
mpol_equal(vma_policy(prev), policy) && |
1da177e4c Linux-2.6.12-rc2 |
1109 |
can_vma_merge_after(prev, vm_flags, |
19a809afe userfaultfd: teac... |
1110 1111 |
anon_vma, file, pgoff, vm_userfaultfd_ctx)) { |
1da177e4c Linux-2.6.12-rc2 |
1112 1113 1114 1115 1116 1117 |
/* * OK, it can. Can we now merge in the successor as well? */ if (next && end == next->vm_start && mpol_equal(policy, vma_policy(next)) && can_vma_merge_before(next, vm_flags, |
19a809afe userfaultfd: teac... |
1118 1119 1120 |
anon_vma, file, pgoff+pglen, vm_userfaultfd_ctx) && |
1da177e4c Linux-2.6.12-rc2 |
1121 |
is_mergeable_anon_vma(prev->anon_vma, |
965f55dea mmap: avoid mergi... |
1122 |
next->anon_vma, NULL)) { |
1da177e4c Linux-2.6.12-rc2 |
1123 |
/* cases 1, 6 */ |
e86f15ee6 mm: vma_merge: fi... |
1124 1125 1126 |
err = __vma_adjust(prev, prev->vm_start, next->vm_end, prev->vm_pgoff, NULL, prev); |
1da177e4c Linux-2.6.12-rc2 |
1127 |
} else /* cases 2, 5, 7 */ |
e86f15ee6 mm: vma_merge: fi... |
1128 1129 |
err = __vma_adjust(prev, prev->vm_start, end, prev->vm_pgoff, NULL, prev); |
5beb49305 mm: change anon_v... |
1130 1131 |
if (err) return NULL; |
6d50e60cd mm, thp: fix coll... |
1132 |
khugepaged_enter_vma_merge(prev, vm_flags); |
1da177e4c Linux-2.6.12-rc2 |
1133 1134 1135 1136 1137 1138 1139 |
return prev; } /* * Can this new request be merged in front of next? */ if (next && end == next->vm_start && |
cc71aba34 mm/mmap.c: whites... |
1140 |
mpol_equal(policy, vma_policy(next)) && |
1da177e4c Linux-2.6.12-rc2 |
1141 |
can_vma_merge_before(next, vm_flags, |
19a809afe userfaultfd: teac... |
1142 1143 |
anon_vma, file, pgoff+pglen, vm_userfaultfd_ctx)) { |
1da177e4c Linux-2.6.12-rc2 |
1144 |
if (prev && addr < prev->vm_end) /* case 4 */ |
e86f15ee6 mm: vma_merge: fi... |
1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 |
err = __vma_adjust(prev, prev->vm_start, addr, prev->vm_pgoff, NULL, next); else { /* cases 3, 8 */ err = __vma_adjust(area, addr, next->vm_end, next->vm_pgoff - pglen, NULL, next); /* * In case 3 area is already equal to next and * this is a noop, but in case 8 "area" has * been removed and next was expanded over it. */ area = next; } |
5beb49305 mm: change anon_v... |
1157 1158 |
if (err) return NULL; |
6d50e60cd mm, thp: fix coll... |
1159 |
khugepaged_enter_vma_merge(area, vm_flags); |
1da177e4c Linux-2.6.12-rc2 |
1160 1161 1162 1163 1164 1165 1166 |
return area; } return NULL; } /* |
d0e9fe175 Simplify and comm... |
1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 |
* Rough compatbility check to quickly see if it's even worth looking * at sharing an anon_vma. * * They need to have the same vm_file, and the flags can only differ * in things that mprotect may change. * * NOTE! The fact that we share an anon_vma doesn't _have_ to mean that * we can merge the two vma's. For example, we refuse to merge a vma if * there is a vm_ops->close() function, because that indicates that the * driver is doing some kind of reference counting. But that doesn't * really matter for the anon_vma sharing case. */ static int anon_vma_compatible(struct vm_area_struct *a, struct vm_area_struct *b) { return a->vm_end == b->vm_start && mpol_equal(vma_policy(a), vma_policy(b)) && a->vm_file == b->vm_file && |
34228d473 mm: ignore VM_SOF... |
1184 |
!((a->vm_flags ^ b->vm_flags) & ~(VM_READ|VM_WRITE|VM_EXEC|VM_SOFTDIRTY)) && |
d0e9fe175 Simplify and comm... |
1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 |
b->vm_pgoff == a->vm_pgoff + ((b->vm_start - a->vm_start) >> PAGE_SHIFT); } /* * Do some basic sanity checking to see if we can re-use the anon_vma * from 'old'. The 'a'/'b' vma's are in VM order - one of them will be * the same as 'old', the other will be the new one that is trying * to share the anon_vma. * * NOTE! This runs with mm_sem held for reading, so it is possible that * the anon_vma of 'old' is concurrently in the process of being set up * by another page fault trying to merge _that_. But that's ok: if it * is being set up, that automatically means that it will be a singleton * acceptable for merging, so we can do all of this optimistically. But |
4db0c3c29 mm: remove rest o... |
1199 |
* we do that READ_ONCE() to make sure that we never re-load the pointer. |
d0e9fe175 Simplify and comm... |
1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 |
* * IOW: that the "list_is_singular()" test on the anon_vma_chain only * matters for the 'stable anon_vma' case (ie the thing we want to avoid * is to return an anon_vma that is "complex" due to having gone through * a fork). * * We also make sure that the two vma's are compatible (adjacent, * and with the same memory policies). That's all stable, even with just * a read lock on the mm_sem. */ static struct anon_vma *reusable_anon_vma(struct vm_area_struct *old, struct vm_area_struct *a, struct vm_area_struct *b) { if (anon_vma_compatible(a, b)) { |
4db0c3c29 mm: remove rest o... |
1213 |
struct anon_vma *anon_vma = READ_ONCE(old->anon_vma); |
d0e9fe175 Simplify and comm... |
1214 1215 1216 1217 1218 1219 1220 1221 |
if (anon_vma && list_is_singular(&old->anon_vma_chain)) return anon_vma; } return NULL; } /* |
1da177e4c Linux-2.6.12-rc2 |
1222 1223 1224 1225 1226 1227 1228 1229 1230 |
* find_mergeable_anon_vma is used by anon_vma_prepare, to check * neighbouring vmas for a suitable anon_vma, before it goes off * to allocate a new anon_vma. It checks because a repetitive * sequence of mprotects and faults may otherwise lead to distinct * anon_vmas being allocated, preventing vma merge in subsequent * mprotect. */ struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *vma) { |
d0e9fe175 Simplify and comm... |
1231 |
struct anon_vma *anon_vma; |
1da177e4c Linux-2.6.12-rc2 |
1232 |
struct vm_area_struct *near; |
1da177e4c Linux-2.6.12-rc2 |
1233 1234 1235 1236 |
near = vma->vm_next; if (!near) goto try_prev; |
d0e9fe175 Simplify and comm... |
1237 1238 1239 |
anon_vma = reusable_anon_vma(near, vma, near); if (anon_vma) return anon_vma; |
1da177e4c Linux-2.6.12-rc2 |
1240 |
try_prev: |
9be34c9d5 mm: get rid of th... |
1241 |
near = vma->vm_prev; |
1da177e4c Linux-2.6.12-rc2 |
1242 1243 |
if (!near) goto none; |
d0e9fe175 Simplify and comm... |
1244 1245 1246 |
anon_vma = reusable_anon_vma(near, near, vma); if (anon_vma) return anon_vma; |
1da177e4c Linux-2.6.12-rc2 |
1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 |
none: /* * There's no absolute need to look only at touching neighbours: * we could search further afield for "compatible" anon_vmas. * But it would probably just be a waste of time searching, * or lead to too many vmas hanging off the same anon_vma. * We're trying to allow mprotect remerging later on, * not trying to minimize memory used for anon_vmas. */ return NULL; } |
1da177e4c Linux-2.6.12-rc2 |
1258 |
/* |
404015308 security: trim se... |
1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 |
* If a hint addr is less than mmap_min_addr change hint to be as * low as possible but still greater than mmap_min_addr */ static inline unsigned long round_hint_to_min(unsigned long hint) { hint &= PAGE_MASK; if (((void *)hint != NULL) && (hint < mmap_min_addr)) return PAGE_ALIGN(mmap_min_addr); return hint; } |
363ee17f0 mm/mmap.c: add ml... |
1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 |
static inline int mlock_future_check(struct mm_struct *mm, unsigned long flags, unsigned long len) { unsigned long locked, lock_limit; /* mlock MCL_FUTURE? */ if (flags & VM_LOCKED) { locked = len >> PAGE_SHIFT; locked += mm->locked_vm; lock_limit = rlimit(RLIMIT_MEMLOCK); lock_limit >>= PAGE_SHIFT; if (locked > lock_limit && !capable(CAP_IPC_LOCK)) return -EAGAIN; } return 0; } |
be83bbf80 mmap: introduce s... |
1287 1288 1289 |
static inline u64 file_mmap_size_max(struct file *file, struct inode *inode) { if (S_ISREG(inode->i_mode)) |
423913ad4 mmap: relax file ... |
1290 |
return MAX_LFS_FILESIZE; |
be83bbf80 mmap: introduce s... |
1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 |
if (S_ISBLK(inode->i_mode)) return MAX_LFS_FILESIZE; /* Special "we do even unsigned file positions" case */ if (file->f_mode & FMODE_UNSIGNED_OFFSET) return 0; /* Yes, random drivers might want more. But I'm tired of buggy drivers */ return ULONG_MAX; } static inline bool file_mmap_ok(struct file *file, struct inode *inode, unsigned long pgoff, unsigned long len) { u64 maxsize = file_mmap_size_max(file, inode); if (maxsize && len > maxsize) return false; maxsize -= len; if (pgoff > maxsize >> PAGE_SHIFT) return false; return true; } |
404015308 security: trim se... |
1315 |
/* |
27f5de796 mm: Fix problem o... |
1316 |
* The caller must hold down_write(¤t->mm->mmap_sem). |
1da177e4c Linux-2.6.12-rc2 |
1317 |
*/ |
1fcfd8db7 mm, mpx: add "vm_... |
1318 |
unsigned long do_mmap(struct file *file, unsigned long addr, |
1da177e4c Linux-2.6.12-rc2 |
1319 |
unsigned long len, unsigned long prot, |
1fcfd8db7 mm, mpx: add "vm_... |
1320 |
unsigned long flags, vm_flags_t vm_flags, |
897ab3e0c userfaultfd: non-... |
1321 1322 |
unsigned long pgoff, unsigned long *populate, struct list_head *uf) |
1da177e4c Linux-2.6.12-rc2 |
1323 |
{ |
cc71aba34 mm/mmap.c: whites... |
1324 |
struct mm_struct *mm = current->mm; |
62b5f7d01 mm/core, x86/mm/p... |
1325 |
int pkey = 0; |
1da177e4c Linux-2.6.12-rc2 |
1326 |
|
41badc15c mm: make do_mmap_... |
1327 |
*populate = 0; |
bebeb3d68 mm: introduce mm_... |
1328 |
|
e37609bb3 mm/mmap.c: optimi... |
1329 1330 |
if (!len) return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
1331 1332 1333 1334 1335 1336 1337 |
/* * Does the application expect PROT_READ to imply PROT_EXEC? * * (the exception is when the underlying filesystem is noexec * mounted, in which case we dont add PROT_EXEC.) */ if ((prot & PROT_READ) && (current->personality & READ_IMPLIES_EXEC)) |
90f8572b0 vfs: Commit to ne... |
1338 |
if (!(file && path_noexec(&file->f_path))) |
1da177e4c Linux-2.6.12-rc2 |
1339 |
prot |= PROT_EXEC; |
a4ff8e862 mm: introduce MAP... |
1340 1341 1342 |
/* force arch specific MAP_FIXED handling in get_unmapped_area */ if (flags & MAP_FIXED_NOREPLACE) flags |= MAP_FIXED; |
7cd94146c Security: round m... |
1343 1344 |
if (!(flags & MAP_FIXED)) addr = round_hint_to_min(addr); |
1da177e4c Linux-2.6.12-rc2 |
1345 1346 |
/* Careful about overflows.. */ len = PAGE_ALIGN(len); |
9206de95b Take arch_mmap_ch... |
1347 |
if (!len) |
1da177e4c Linux-2.6.12-rc2 |
1348 1349 1350 1351 |
return -ENOMEM; /* offset overflow? */ if ((pgoff + (len >> PAGE_SHIFT)) < pgoff) |
cc71aba34 mm/mmap.c: whites... |
1352 |
return -EOVERFLOW; |
1da177e4c Linux-2.6.12-rc2 |
1353 1354 1355 1356 1357 1358 1359 1360 1361 |
/* Too many mappings? */ if (mm->map_count > sysctl_max_map_count) return -ENOMEM; /* Obtain the address to map to. we verify (or select) it and ensure * that it represents a valid section of the address space. */ addr = get_unmapped_area(file, addr, len, pgoff, flags); |
de1741a13 mm/mmap: use offs... |
1362 |
if (offset_in_page(addr)) |
1da177e4c Linux-2.6.12-rc2 |
1363 |
return addr; |
a4ff8e862 mm: introduce MAP... |
1364 1365 |
if (flags & MAP_FIXED_NOREPLACE) { struct vm_area_struct *vma = find_vma(mm, addr); |
7aa867dd8 mm/mmap.c: don't ... |
1366 |
if (vma && vma->vm_start < addr + len) |
a4ff8e862 mm: introduce MAP... |
1367 1368 |
return -EEXIST; } |
62b5f7d01 mm/core, x86/mm/p... |
1369 1370 1371 1372 1373 |
if (prot == PROT_EXEC) { pkey = execute_only_pkey(mm); if (pkey < 0) pkey = 0; } |
1da177e4c Linux-2.6.12-rc2 |
1374 1375 1376 1377 |
/* Do simple checking here so the lower-level routines won't have * to. we assume access permissions have been handled by the open * of the memory object, so we don't do any here. */ |
62b5f7d01 mm/core, x86/mm/p... |
1378 |
vm_flags |= calc_vm_prot_bits(prot, pkey) | calc_vm_flag_bits(flags) | |
1da177e4c Linux-2.6.12-rc2 |
1379 |
mm->def_flags | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC; |
cdf7b3418 mmap: remove unne... |
1380 |
if (flags & MAP_LOCKED) |
1da177e4c Linux-2.6.12-rc2 |
1381 1382 |
if (!can_do_mlock()) return -EPERM; |
ba470de43 mmap: handle mloc... |
1383 |
|
363ee17f0 mm/mmap.c: add ml... |
1384 1385 |
if (mlock_future_check(mm, vm_flags, len)) return -EAGAIN; |
1da177e4c Linux-2.6.12-rc2 |
1386 |
|
1da177e4c Linux-2.6.12-rc2 |
1387 |
if (file) { |
077bf22b5 mm: do_mmap_pgoff... |
1388 |
struct inode *inode = file_inode(file); |
1c9725974 mm: introduce MAP... |
1389 |
unsigned long flags_mask; |
be83bbf80 mmap: introduce s... |
1390 1391 |
if (!file_mmap_ok(file, inode, pgoff, len)) return -EOVERFLOW; |
1c9725974 mm: introduce MAP... |
1392 |
flags_mask = LEGACY_MAP_MASK | file->f_op->mmap_supported_flags; |
077bf22b5 mm: do_mmap_pgoff... |
1393 |
|
1da177e4c Linux-2.6.12-rc2 |
1394 1395 |
switch (flags & MAP_TYPE) { case MAP_SHARED: |
1c9725974 mm: introduce MAP... |
1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 |
/* * Force use of MAP_SHARED_VALIDATE with non-legacy * flags. E.g. MAP_SYNC is dangerous to use with * MAP_SHARED as you don't know which consistency model * you will get. We silently ignore unsupported flags * with MAP_SHARED to preserve backward compatibility. */ flags &= LEGACY_MAP_MASK; /* fall through */ case MAP_SHARED_VALIDATE: if (flags & ~flags_mask) return -EOPNOTSUPP; |
1da177e4c Linux-2.6.12-rc2 |
1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 |
if ((prot&PROT_WRITE) && !(file->f_mode&FMODE_WRITE)) return -EACCES; /* * Make sure we don't allow writing to an append-only * file.. */ if (IS_APPEND(inode) && (file->f_mode & FMODE_WRITE)) return -EACCES; /* * Make sure there are no mandatory locks on the file. */ |
d7a06983a locks: fix locks_... |
1421 |
if (locks_verify_locked(file)) |
1da177e4c Linux-2.6.12-rc2 |
1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 |
return -EAGAIN; vm_flags |= VM_SHARED | VM_MAYSHARE; if (!(file->f_mode & FMODE_WRITE)) vm_flags &= ~(VM_MAYWRITE | VM_SHARED); /* fall through */ case MAP_PRIVATE: if (!(file->f_mode & FMODE_READ)) return -EACCES; |
90f8572b0 vfs: Commit to ne... |
1432 |
if (path_noexec(&file->f_path)) { |
80c5606c3 Fix VM_MAYEXEC ca... |
1433 1434 1435 1436 |
if (vm_flags & VM_EXEC) return -EPERM; vm_flags &= ~VM_MAYEXEC; } |
80c5606c3 Fix VM_MAYEXEC ca... |
1437 |
|
72c2d5319 file->f_op is nev... |
1438 |
if (!file->f_op->mmap) |
80c5606c3 Fix VM_MAYEXEC ca... |
1439 |
return -ENODEV; |
b2c56e4f7 mm: shift VM_GROW... |
1440 1441 |
if (vm_flags & (VM_GROWSDOWN|VM_GROWSUP)) return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
1442 1443 1444 1445 1446 1447 1448 1449 |
break; default: return -EINVAL; } } else { switch (flags & MAP_TYPE) { case MAP_SHARED: |
b2c56e4f7 mm: shift VM_GROW... |
1450 1451 |
if (vm_flags & (VM_GROWSDOWN|VM_GROWSUP)) return -EINVAL; |
ce3639426 mmap: fix petty b... |
1452 1453 1454 1455 |
/* * Ignore pgoff. */ pgoff = 0; |
1da177e4c Linux-2.6.12-rc2 |
1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 |
vm_flags |= VM_SHARED | VM_MAYSHARE; break; case MAP_PRIVATE: /* * Set pgoff according to addr for anon_vma. */ pgoff = addr >> PAGE_SHIFT; break; default: return -EINVAL; } } |
c22c0d634 mm: remove flags ... |
1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 |
/* * Set 'VM_NORESERVE' if we should not account for the * memory use of this mapping. */ if (flags & MAP_NORESERVE) { /* We honor MAP_NORESERVE if allowed to overcommit */ if (sysctl_overcommit_memory != OVERCOMMIT_NEVER) vm_flags |= VM_NORESERVE; /* hugetlb applies strict overcommit unless MAP_NORESERVE */ if (file && is_file_hugepages(file)) vm_flags |= VM_NORESERVE; } |
897ab3e0c userfaultfd: non-... |
1481 |
addr = mmap_region(file, addr, len, vm_flags, pgoff, uf); |
09a9f1d27 Revert "mm: intro... |
1482 1483 1484 |
if (!IS_ERR_VALUE(addr) && ((vm_flags & VM_LOCKED) || (flags & (MAP_POPULATE | MAP_NONBLOCK)) == MAP_POPULATE)) |
41badc15c mm: make do_mmap_... |
1485 |
*populate = len; |
bebeb3d68 mm: introduce mm_... |
1486 |
return addr; |
0165ab443 split mmap |
1487 |
} |
6be5ceb02 VM: add "vm_mmap(... |
1488 |
|
a90f590a1 mm: add ksys_mmap... |
1489 1490 1491 |
unsigned long ksys_mmap_pgoff(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, unsigned long fd, unsigned long pgoff) |
66f0dc481 mm: move sys_mmap... |
1492 1493 |
{ struct file *file = NULL; |
1e3ee14b9 mm/mmap.c: do not... |
1494 |
unsigned long retval; |
66f0dc481 mm: move sys_mmap... |
1495 1496 |
if (!(flags & MAP_ANONYMOUS)) { |
120a795da audit mmap |
1497 |
audit_mmap_fd(fd, flags); |
66f0dc481 mm: move sys_mmap... |
1498 1499 |
file = fget(fd); if (!file) |
1e3ee14b9 mm/mmap.c: do not... |
1500 |
return -EBADF; |
af73e4d95 hugetlbfs: fix mm... |
1501 1502 |
if (is_file_hugepages(file)) len = ALIGN(len, huge_page_size(hstate_file(file))); |
493af5780 mmap: allow MAP_H... |
1503 1504 1505 |
retval = -EINVAL; if (unlikely(flags & MAP_HUGETLB && !is_file_hugepages(file))) goto out_fput; |
66f0dc481 mm: move sys_mmap... |
1506 1507 |
} else if (flags & MAP_HUGETLB) { struct user_struct *user = NULL; |
c103a4dc4 ipc/shmc.c: elimi... |
1508 |
struct hstate *hs; |
af73e4d95 hugetlbfs: fix mm... |
1509 |
|
20ac28933 mm/mmap: replace ... |
1510 |
hs = hstate_sizelog((flags >> MAP_HUGE_SHIFT) & MAP_HUGE_MASK); |
091d0d55b shm: fix null poi... |
1511 1512 1513 1514 |
if (!hs) return -EINVAL; len = ALIGN(len, huge_page_size(hs)); |
66f0dc481 mm: move sys_mmap... |
1515 1516 1517 1518 1519 1520 |
/* * VM_NORESERVE is used because the reservations will be * taken when vm_ops->mmap() is called * A dummy user value is used because we are not locking * memory so no accounting is necessary */ |
af73e4d95 hugetlbfs: fix mm... |
1521 |
file = hugetlb_file_setup(HUGETLB_ANON_FILE, len, |
42d7395fe mm: support more ... |
1522 1523 1524 |
VM_NORESERVE, &user, HUGETLB_ANONHUGE_INODE, (flags >> MAP_HUGE_SHIFT) & MAP_HUGE_MASK); |
66f0dc481 mm: move sys_mmap... |
1525 1526 1527 1528 1529 |
if (IS_ERR(file)) return PTR_ERR(file); } flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); |
9fbeb5ab5 mm: make vm_mmap ... |
1530 |
retval = vm_mmap_pgoff(file, addr, len, prot, flags, pgoff); |
493af5780 mmap: allow MAP_H... |
1531 |
out_fput: |
66f0dc481 mm: move sys_mmap... |
1532 1533 |
if (file) fput(file); |
66f0dc481 mm: move sys_mmap... |
1534 1535 |
return retval; } |
a90f590a1 mm: add ksys_mmap... |
1536 1537 1538 1539 1540 1541 |
SYSCALL_DEFINE6(mmap_pgoff, unsigned long, addr, unsigned long, len, unsigned long, prot, unsigned long, flags, unsigned long, fd, unsigned long, pgoff) { return ksys_mmap_pgoff(addr, len, prot, flags, fd, pgoff); } |
a4679373c Add generic sys_o... |
1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 |
#ifdef __ARCH_WANT_SYS_OLD_MMAP struct mmap_arg_struct { unsigned long addr; unsigned long len; unsigned long prot; unsigned long flags; unsigned long fd; unsigned long offset; }; SYSCALL_DEFINE1(old_mmap, struct mmap_arg_struct __user *, arg) { struct mmap_arg_struct a; if (copy_from_user(&a, arg, sizeof(a))) return -EFAULT; |
de1741a13 mm/mmap: use offs... |
1558 |
if (offset_in_page(a.offset)) |
a4679373c Add generic sys_o... |
1559 |
return -EINVAL; |
a90f590a1 mm: add ksys_mmap... |
1560 1561 |
return ksys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT); |
a4679373c Add generic sys_o... |
1562 1563 |
} #endif /* __ARCH_WANT_SYS_OLD_MMAP */ |
4e950f6f0 Remove fs.h from ... |
1564 1565 1566 1567 1568 1569 |
/* * Some shared mappigns will want the pages marked read-only * to track write events. If so, we'll downgrade vm_page_prot * to the private version (using protection_map[] without the * VM_SHARED bit). */ |
6d2329f88 mm: vm_page_prot:... |
1570 |
int vma_wants_writenotify(struct vm_area_struct *vma, pgprot_t vm_page_prot) |
4e950f6f0 Remove fs.h from ... |
1571 |
{ |
ca16d140a mm: don't access ... |
1572 |
vm_flags_t vm_flags = vma->vm_flags; |
8a04446ab mm, dax: VMA with... |
1573 |
const struct vm_operations_struct *vm_ops = vma->vm_ops; |
4e950f6f0 Remove fs.h from ... |
1574 1575 1576 1577 1578 1579 |
/* If it was private or non-writable, the write bit is already clear */ if ((vm_flags & (VM_WRITE|VM_SHARED)) != ((VM_WRITE|VM_SHARED))) return 0; /* The backer wishes to know when pages are first written to? */ |
8a04446ab mm, dax: VMA with... |
1580 |
if (vm_ops && (vm_ops->page_mkwrite || vm_ops->pfn_mkwrite)) |
4e950f6f0 Remove fs.h from ... |
1581 |
return 1; |
64e455079 mm: softdirty: en... |
1582 1583 |
/* The open routine did something to the protections that pgprot_modify * won't preserve? */ |
6d2329f88 mm: vm_page_prot:... |
1584 1585 |
if (pgprot_val(vm_page_prot) != pgprot_val(vm_pgprot_modify(vm_page_prot, vm_flags))) |
4e950f6f0 Remove fs.h from ... |
1586 |
return 0; |
64e455079 mm: softdirty: en... |
1587 1588 1589 |
/* Do we need to track softdirty? */ if (IS_ENABLED(CONFIG_MEM_SOFT_DIRTY) && !(vm_flags & VM_SOFTDIRTY)) return 1; |
4e950f6f0 Remove fs.h from ... |
1590 |
/* Specialty mapping? */ |
4b6e1e370 mm: kill vma flag... |
1591 |
if (vm_flags & VM_PFNMAP) |
4e950f6f0 Remove fs.h from ... |
1592 1593 1594 1595 1596 1597 |
return 0; /* Can the mapping track the dirty pages? */ return vma->vm_file && vma->vm_file->f_mapping && mapping_cap_account_dirty(vma->vm_file->f_mapping); } |
fc8744adc Stop playing sill... |
1598 1599 |
/* * We account for memory if it's a private writeable mapping, |
5a6fe1259 Do not account fo... |
1600 |
* not hugepages and VM_NORESERVE wasn't set. |
fc8744adc Stop playing sill... |
1601 |
*/ |
ca16d140a mm: don't access ... |
1602 |
static inline int accountable_mapping(struct file *file, vm_flags_t vm_flags) |
fc8744adc Stop playing sill... |
1603 |
{ |
5a6fe1259 Do not account fo... |
1604 1605 1606 1607 1608 1609 |
/* * hugetlb has its own accounting separate from the core VM * VM_HUGETLB may not be set yet so we cannot check for that flag. */ if (file && is_file_hugepages(file)) return 0; |
fc8744adc Stop playing sill... |
1610 1611 |
return (vm_flags & (VM_NORESERVE | VM_SHARED | VM_WRITE)) == VM_WRITE; } |
0165ab443 split mmap |
1612 |
unsigned long mmap_region(struct file *file, unsigned long addr, |
897ab3e0c userfaultfd: non-... |
1613 1614 |
unsigned long len, vm_flags_t vm_flags, unsigned long pgoff, struct list_head *uf) |
0165ab443 split mmap |
1615 1616 1617 |
{ struct mm_struct *mm = current->mm; struct vm_area_struct *vma, *prev; |
0165ab443 split mmap |
1618 1619 1620 |
int error; struct rb_node **rb_link, *rb_parent; unsigned long charged = 0; |
0165ab443 split mmap |
1621 |
|
e8420a8ec mm/mmap: check fo... |
1622 |
/* Check against address space limit. */ |
846383359 mm: rework virtua... |
1623 |
if (!may_expand_vm(mm, vm_flags, len >> PAGE_SHIFT)) { |
e8420a8ec mm/mmap: check fo... |
1624 1625 1626 1627 1628 1629 |
unsigned long nr_pages; /* * MAP_FIXED may remove pages of mappings that intersects with * requested mapping. Account for the pages it would unmap. */ |
e8420a8ec mm/mmap: check fo... |
1630 |
nr_pages = count_vma_pages_range(mm, addr, addr + len); |
846383359 mm: rework virtua... |
1631 1632 |
if (!may_expand_vm(mm, vm_flags, (len >> PAGE_SHIFT) - nr_pages)) |
e8420a8ec mm/mmap: check fo... |
1633 1634 |
return -ENOMEM; } |
1da177e4c Linux-2.6.12-rc2 |
1635 |
/* Clear old maps */ |
9fcd14571 mm/mmap.c: use wh... |
1636 1637 |
while (find_vma_links(mm, addr, addr + len, &prev, &rb_link, &rb_parent)) { |
897ab3e0c userfaultfd: non-... |
1638 |
if (do_munmap(mm, addr, len, uf)) |
1da177e4c Linux-2.6.12-rc2 |
1639 |
return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1640 |
} |
fc8744adc Stop playing sill... |
1641 |
/* |
fc8744adc Stop playing sill... |
1642 1643 |
* Private writable mapping: check memory availability */ |
5a6fe1259 Do not account fo... |
1644 |
if (accountable_mapping(file, vm_flags)) { |
fc8744adc Stop playing sill... |
1645 |
charged = len >> PAGE_SHIFT; |
191c54244 mm: collapse secu... |
1646 |
if (security_vm_enough_memory_mm(mm, charged)) |
fc8744adc Stop playing sill... |
1647 1648 |
return -ENOMEM; vm_flags |= VM_ACCOUNT; |
1da177e4c Linux-2.6.12-rc2 |
1649 1650 1651 |
} /* |
de33c8db5 Fix OOPS in mmap_... |
1652 |
* Can we just expand an old mapping? |
1da177e4c Linux-2.6.12-rc2 |
1653 |
*/ |
19a809afe userfaultfd: teac... |
1654 1655 |
vma = vma_merge(mm, prev, addr, addr + len, vm_flags, NULL, file, pgoff, NULL, NULL_VM_UFFD_CTX); |
de33c8db5 Fix OOPS in mmap_... |
1656 1657 |
if (vma) goto out; |
1da177e4c Linux-2.6.12-rc2 |
1658 1659 1660 1661 1662 1663 |
/* * Determine the object being mapped and call the appropriate * specific mapper. the address has already been validated, but * not unmapped, but the maps are removed from the list. */ |
490fc0538 mm: make vm_area_... |
1664 |
vma = vm_area_alloc(mm); |
1da177e4c Linux-2.6.12-rc2 |
1665 1666 1667 1668 |
if (!vma) { error = -ENOMEM; goto unacct_error; } |
1da177e4c Linux-2.6.12-rc2 |
1669 |
|
1da177e4c Linux-2.6.12-rc2 |
1670 1671 1672 |
vma->vm_start = addr; vma->vm_end = addr + len; vma->vm_flags = vm_flags; |
3ed75eb8f setup vma->vm_pag... |
1673 |
vma->vm_page_prot = vm_get_page_prot(vm_flags); |
1da177e4c Linux-2.6.12-rc2 |
1674 1675 1676 |
vma->vm_pgoff = pgoff; if (file) { |
1da177e4c Linux-2.6.12-rc2 |
1677 1678 1679 1680 |
if (vm_flags & VM_DENYWRITE) { error = deny_write_access(file); if (error) goto free_vma; |
1da177e4c Linux-2.6.12-rc2 |
1681 |
} |
4bb5f5d93 mm: allow drivers... |
1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 |
if (vm_flags & VM_SHARED) { error = mapping_map_writable(file->f_mapping); if (error) goto allow_write_and_free_vma; } /* ->mmap() can change vma->vm_file, but must guarantee that * vma_link() below can deny write-access if VM_DENYWRITE is set * and map writably if VM_SHARED is set. This usually means the * new file must not have been exposed to user-space, yet. */ |
cb0942b81 make get_file() r... |
1693 |
vma->vm_file = get_file(file); |
f74ac0152 mm: use helper fo... |
1694 |
error = call_mmap(file, vma); |
1da177e4c Linux-2.6.12-rc2 |
1695 1696 |
if (error) goto unmap_and_free_vma; |
f8dbf0a7a mmap: save some c... |
1697 1698 1699 1700 1701 |
/* Can addr have changed?? * * Answer: Yes, several device drivers can do it in their * f_op->mmap method. -DaveM |
2897b4d29 mm: WARN_ON_ONCE ... |
1702 1703 |
* Bug: If addr is changed, prev, rb_link, rb_parent should * be updated for vma_link() |
f8dbf0a7a mmap: save some c... |
1704 |
*/ |
2897b4d29 mm: WARN_ON_ONCE ... |
1705 |
WARN_ON_ONCE(addr != vma->vm_start); |
f8dbf0a7a mmap: save some c... |
1706 |
addr = vma->vm_start; |
f8dbf0a7a mmap: save some c... |
1707 |
vm_flags = vma->vm_flags; |
1da177e4c Linux-2.6.12-rc2 |
1708 1709 1710 1711 |
} else if (vm_flags & VM_SHARED) { error = shmem_zero_setup(vma); if (error) goto free_vma; |
bfd40eaff mm: fix vma_is_an... |
1712 1713 |
} else { vma_set_anonymous(vma); |
1da177e4c Linux-2.6.12-rc2 |
1714 |
} |
de33c8db5 Fix OOPS in mmap_... |
1715 |
vma_link(mm, vma, prev, rb_link, rb_parent); |
4d3d5b41a mmap_region: clea... |
1716 |
/* Once vma denies write, undo our temporary denial count */ |
4bb5f5d93 mm: allow drivers... |
1717 1718 1719 1720 1721 1722 |
if (file) { if (vm_flags & VM_SHARED) mapping_unmap_writable(file->f_mapping); if (vm_flags & VM_DENYWRITE) allow_write_access(file); } |
e86867720 mm: mmap_region: ... |
1723 |
file = vma->vm_file; |
4d3d5b41a mmap_region: clea... |
1724 |
out: |
cdd6c482c perf: Do the big ... |
1725 |
perf_event_mmap(vma); |
0a4a93919 perf_counter: exe... |
1726 |
|
846383359 mm: rework virtua... |
1727 |
vm_stat_account(mm, vm_flags, len >> PAGE_SHIFT); |
1da177e4c Linux-2.6.12-rc2 |
1728 |
if (vm_flags & VM_LOCKED) { |
e1fb4a086 dax: remove VM_MI... |
1729 1730 1731 |
if ((vm_flags & VM_SPECIAL) || vma_is_dax(vma) || is_vm_hugetlb_page(vma) || vma == get_gate_vma(current->mm)) |
de60f5f10 mm: introduce VM_... |
1732 |
vma->vm_flags &= VM_LOCKED_CLEAR_MASK; |
e1fb4a086 dax: remove VM_MI... |
1733 1734 |
else mm->locked_vm += (len >> PAGE_SHIFT); |
bebeb3d68 mm: introduce mm_... |
1735 |
} |
2b1444983 uprobes, mm, x86:... |
1736 |
|
c7a3a88c9 uprobes: Fix mmap... |
1737 1738 |
if (file) uprobe_mmap(vma); |
2b1444983 uprobes, mm, x86:... |
1739 |
|
d9104d1ca mm: track vma cha... |
1740 1741 1742 1743 1744 1745 1746 1747 |
/* * New (or expanded) vma always get soft dirty status. * Otherwise user-space soft-dirty page tracker won't * be able to distinguish situation when vma area unmapped, * then new mapped in-place (which must be aimed as * a completely new data area). */ vma->vm_flags |= VM_SOFTDIRTY; |
64e455079 mm: softdirty: en... |
1748 |
vma_set_page_prot(vma); |
1da177e4c Linux-2.6.12-rc2 |
1749 1750 1751 |
return addr; unmap_and_free_vma: |
1da177e4c Linux-2.6.12-rc2 |
1752 1753 1754 1755 |
vma->vm_file = NULL; fput(file); /* Undo any partial mapping done by a device driver. */ |
e0da382c9 [PATCH] freepgt: ... |
1756 1757 |
unmap_region(mm, vma, prev, vma->vm_start, vma->vm_end); charged = 0; |
4bb5f5d93 mm: allow drivers... |
1758 1759 1760 1761 1762 |
if (vm_flags & VM_SHARED) mapping_unmap_writable(file->f_mapping); allow_write_and_free_vma: if (vm_flags & VM_DENYWRITE) allow_write_access(file); |
1da177e4c Linux-2.6.12-rc2 |
1763 |
free_vma: |
3928d4f5e mm: use helper fu... |
1764 |
vm_area_free(vma); |
1da177e4c Linux-2.6.12-rc2 |
1765 1766 1767 1768 1769 |
unacct_error: if (charged) vm_unacct_memory(charged); return error; } |
db4fbfb95 mm: vm_unmapped_a... |
1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 |
unsigned long unmapped_area(struct vm_unmapped_area_info *info) { /* * We implement the search by looking for an rbtree node that * immediately follows a suitable gap. That is, * - gap_start = vma->vm_prev->vm_end <= info->high_limit - length; * - gap_end = vma->vm_start >= info->low_limit + length; * - gap_end - gap_start >= length */ struct mm_struct *mm = current->mm; struct vm_area_struct *vma; unsigned long length, low_limit, high_limit, gap_start, gap_end; /* Adjust search length to account for worst case alignment overhead */ length = info->length + info->align_mask; if (length < info->length) return -ENOMEM; /* Adjust search limits by the desired length */ if (info->high_limit < length) return -ENOMEM; high_limit = info->high_limit - length; if (info->low_limit > high_limit) return -ENOMEM; low_limit = info->low_limit + length; /* Check if rbtree root looks promising */ if (RB_EMPTY_ROOT(&mm->mm_rb)) goto check_highest; vma = rb_entry(mm->mm_rb.rb_node, struct vm_area_struct, vm_rb); if (vma->rb_subtree_gap < length) goto check_highest; while (true) { /* Visit left subtree if it looks promising */ |
1be7107fb mm: larger stack ... |
1807 |
gap_end = vm_start_gap(vma); |
db4fbfb95 mm: vm_unmapped_a... |
1808 1809 1810 1811 1812 1813 1814 1815 1816 |
if (gap_end >= low_limit && vma->vm_rb.rb_left) { struct vm_area_struct *left = rb_entry(vma->vm_rb.rb_left, struct vm_area_struct, vm_rb); if (left->rb_subtree_gap >= length) { vma = left; continue; } } |
1be7107fb mm: larger stack ... |
1817 |
gap_start = vma->vm_prev ? vm_end_gap(vma->vm_prev) : 0; |
db4fbfb95 mm: vm_unmapped_a... |
1818 1819 1820 1821 |
check_current: /* Check if current node has a suitable gap */ if (gap_start > high_limit) return -ENOMEM; |
f4cb767d7 mm: fix new crash... |
1822 1823 |
if (gap_end >= low_limit && gap_end > gap_start && gap_end - gap_start >= length) |
db4fbfb95 mm: vm_unmapped_a... |
1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 |
goto found; /* Visit right subtree if it looks promising */ if (vma->vm_rb.rb_right) { struct vm_area_struct *right = rb_entry(vma->vm_rb.rb_right, struct vm_area_struct, vm_rb); if (right->rb_subtree_gap >= length) { vma = right; continue; } } /* Go back up the rbtree to find next candidate node */ while (true) { struct rb_node *prev = &vma->vm_rb; if (!rb_parent(prev)) goto check_highest; vma = rb_entry(rb_parent(prev), struct vm_area_struct, vm_rb); if (prev == vma->vm_rb.rb_left) { |
1be7107fb mm: larger stack ... |
1845 1846 |
gap_start = vm_end_gap(vma->vm_prev); gap_end = vm_start_gap(vma); |
db4fbfb95 mm: vm_unmapped_a... |
1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 |
goto check_current; } } } check_highest: /* Check highest gap, which does not precede any rbtree node */ gap_start = mm->highest_vm_end; gap_end = ULONG_MAX; /* Only for VM_BUG_ON below */ if (gap_start > high_limit) return -ENOMEM; found: /* We found a suitable gap. Clip it with the original low_limit. */ if (gap_start < info->low_limit) gap_start = info->low_limit; /* Adjust gap address to the desired alignment */ gap_start += (info->align_offset - gap_start) & info->align_mask; VM_BUG_ON(gap_start + info->length > info->high_limit); VM_BUG_ON(gap_start + info->length > gap_end); return gap_start; } unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info) { struct mm_struct *mm = current->mm; struct vm_area_struct *vma; unsigned long length, low_limit, high_limit, gap_start, gap_end; /* Adjust search length to account for worst case alignment overhead */ length = info->length + info->align_mask; if (length < info->length) return -ENOMEM; /* * Adjust search limits by the desired length. * See implementation comment at top of unmapped_area(). */ gap_end = info->high_limit; if (gap_end < length) return -ENOMEM; high_limit = gap_end - length; if (info->low_limit > high_limit) return -ENOMEM; low_limit = info->low_limit + length; /* Check highest gap, which does not precede any rbtree node */ gap_start = mm->highest_vm_end; if (gap_start <= high_limit) goto found_highest; /* Check if rbtree root looks promising */ if (RB_EMPTY_ROOT(&mm->mm_rb)) return -ENOMEM; vma = rb_entry(mm->mm_rb.rb_node, struct vm_area_struct, vm_rb); if (vma->rb_subtree_gap < length) return -ENOMEM; while (true) { /* Visit right subtree if it looks promising */ |
1be7107fb mm: larger stack ... |
1910 |
gap_start = vma->vm_prev ? vm_end_gap(vma->vm_prev) : 0; |
db4fbfb95 mm: vm_unmapped_a... |
1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 |
if (gap_start <= high_limit && vma->vm_rb.rb_right) { struct vm_area_struct *right = rb_entry(vma->vm_rb.rb_right, struct vm_area_struct, vm_rb); if (right->rb_subtree_gap >= length) { vma = right; continue; } } check_current: /* Check if current node has a suitable gap */ |
1be7107fb mm: larger stack ... |
1923 |
gap_end = vm_start_gap(vma); |
db4fbfb95 mm: vm_unmapped_a... |
1924 1925 |
if (gap_end < low_limit) return -ENOMEM; |
f4cb767d7 mm: fix new crash... |
1926 1927 |
if (gap_start <= high_limit && gap_end > gap_start && gap_end - gap_start >= length) |
db4fbfb95 mm: vm_unmapped_a... |
1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 |
goto found; /* Visit left subtree if it looks promising */ if (vma->vm_rb.rb_left) { struct vm_area_struct *left = rb_entry(vma->vm_rb.rb_left, struct vm_area_struct, vm_rb); if (left->rb_subtree_gap >= length) { vma = left; continue; } } /* Go back up the rbtree to find next candidate node */ while (true) { struct rb_node *prev = &vma->vm_rb; if (!rb_parent(prev)) return -ENOMEM; vma = rb_entry(rb_parent(prev), struct vm_area_struct, vm_rb); if (prev == vma->vm_rb.rb_right) { gap_start = vma->vm_prev ? |
1be7107fb mm: larger stack ... |
1950 |
vm_end_gap(vma->vm_prev) : 0; |
db4fbfb95 mm: vm_unmapped_a... |
1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 |
goto check_current; } } } found: /* We found a suitable gap. Clip it with the original high_limit. */ if (gap_end > info->high_limit) gap_end = info->high_limit; found_highest: /* Compute highest gap address at the desired alignment */ gap_end -= info->length; gap_end -= (gap_end - info->align_offset) & info->align_mask; VM_BUG_ON(gap_end < info->low_limit); VM_BUG_ON(gap_end < gap_start); return gap_end; } |
1da177e4c Linux-2.6.12-rc2 |
1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 |
/* Get an address range which is currently unmapped. * For shmat() with addr=0. * * Ugly calling convention alert: * Return value with the low bits set means error value, * ie * if (ret & ~PAGE_MASK) * error = ret; * * This function "knows" that -ENOMEM has the bits set. */ #ifndef HAVE_ARCH_UNMAPPED_AREA unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) { struct mm_struct *mm = current->mm; |
1be7107fb mm: larger stack ... |
1987 |
struct vm_area_struct *vma, *prev; |
db4fbfb95 mm: vm_unmapped_a... |
1988 |
struct vm_unmapped_area_info info; |
1da177e4c Linux-2.6.12-rc2 |
1989 |
|
2afc745f3 mm: ensure get_un... |
1990 |
if (len > TASK_SIZE - mmap_min_addr) |
1da177e4c Linux-2.6.12-rc2 |
1991 |
return -ENOMEM; |
06abdfb47 get_unmapped_area... |
1992 1993 |
if (flags & MAP_FIXED) return addr; |
1da177e4c Linux-2.6.12-rc2 |
1994 1995 |
if (addr) { addr = PAGE_ALIGN(addr); |
1be7107fb mm: larger stack ... |
1996 |
vma = find_vma_prev(mm, addr, &prev); |
2afc745f3 mm: ensure get_un... |
1997 |
if (TASK_SIZE - len >= addr && addr >= mmap_min_addr && |
1be7107fb mm: larger stack ... |
1998 1999 |
(!vma || addr + len <= vm_start_gap(vma)) && (!prev || addr >= vm_end_gap(prev))) |
1da177e4c Linux-2.6.12-rc2 |
2000 2001 |
return addr; } |
1da177e4c Linux-2.6.12-rc2 |
2002 |
|
db4fbfb95 mm: vm_unmapped_a... |
2003 2004 |
info.flags = 0; info.length = len; |
4e99b0213 mmap: arch_get_un... |
2005 |
info.low_limit = mm->mmap_base; |
db4fbfb95 mm: vm_unmapped_a... |
2006 2007 2008 |
info.high_limit = TASK_SIZE; info.align_mask = 0; return vm_unmapped_area(&info); |
1da177e4c Linux-2.6.12-rc2 |
2009 |
} |
cc71aba34 mm/mmap.c: whites... |
2010 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
2011 |
|
1da177e4c Linux-2.6.12-rc2 |
2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 |
/* * This mmap-allocator allocates new areas top-down from below the * stack's low limit (the base): */ #ifndef HAVE_ARCH_UNMAPPED_AREA_TOPDOWN unsigned long arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, const unsigned long len, const unsigned long pgoff, const unsigned long flags) { |
1be7107fb mm: larger stack ... |
2022 |
struct vm_area_struct *vma, *prev; |
1da177e4c Linux-2.6.12-rc2 |
2023 |
struct mm_struct *mm = current->mm; |
db4fbfb95 mm: vm_unmapped_a... |
2024 2025 |
unsigned long addr = addr0; struct vm_unmapped_area_info info; |
1da177e4c Linux-2.6.12-rc2 |
2026 2027 |
/* requested length too big for entire address space */ |
2afc745f3 mm: ensure get_un... |
2028 |
if (len > TASK_SIZE - mmap_min_addr) |
1da177e4c Linux-2.6.12-rc2 |
2029 |
return -ENOMEM; |
06abdfb47 get_unmapped_area... |
2030 2031 |
if (flags & MAP_FIXED) return addr; |
1da177e4c Linux-2.6.12-rc2 |
2032 2033 2034 |
/* requesting a specific address */ if (addr) { addr = PAGE_ALIGN(addr); |
1be7107fb mm: larger stack ... |
2035 |
vma = find_vma_prev(mm, addr, &prev); |
2afc745f3 mm: ensure get_un... |
2036 |
if (TASK_SIZE - len >= addr && addr >= mmap_min_addr && |
1be7107fb mm: larger stack ... |
2037 2038 |
(!vma || addr + len <= vm_start_gap(vma)) && (!prev || addr >= vm_end_gap(prev))) |
1da177e4c Linux-2.6.12-rc2 |
2039 2040 |
return addr; } |
db4fbfb95 mm: vm_unmapped_a... |
2041 2042 |
info.flags = VM_UNMAPPED_AREA_TOPDOWN; info.length = len; |
2afc745f3 mm: ensure get_un... |
2043 |
info.low_limit = max(PAGE_SIZE, mmap_min_addr); |
db4fbfb95 mm: vm_unmapped_a... |
2044 2045 2046 |
info.high_limit = mm->mmap_base; info.align_mask = 0; addr = vm_unmapped_area(&info); |
b716ad953 mm: search from f... |
2047 |
|
1da177e4c Linux-2.6.12-rc2 |
2048 2049 2050 2051 2052 2053 |
/* * A failed mmap() very likely causes application failure, * so fall back to the bottom-up function here. This scenario * can happen with large stack limits and large mmap() * allocations. */ |
de1741a13 mm/mmap: use offs... |
2054 |
if (offset_in_page(addr)) { |
db4fbfb95 mm: vm_unmapped_a... |
2055 2056 2057 2058 2059 2060 |
VM_BUG_ON(addr != -ENOMEM); info.flags = 0; info.low_limit = TASK_UNMAPPED_BASE; info.high_limit = TASK_SIZE; addr = vm_unmapped_area(&info); } |
1da177e4c Linux-2.6.12-rc2 |
2061 2062 2063 2064 |
return addr; } #endif |
1da177e4c Linux-2.6.12-rc2 |
2065 2066 2067 2068 |
unsigned long get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) { |
06abdfb47 get_unmapped_area... |
2069 2070 |
unsigned long (*get_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); |
9206de95b Take arch_mmap_ch... |
2071 2072 2073 2074 2075 2076 2077 |
unsigned long error = arch_mmap_check(addr, len, flags); if (error) return error; /* Careful about overflows.. */ if (len > TASK_SIZE) return -ENOMEM; |
06abdfb47 get_unmapped_area... |
2078 |
get_area = current->mm->get_unmapped_area; |
c01d5b300 shmem: get_unmapp... |
2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 |
if (file) { if (file->f_op->get_unmapped_area) get_area = file->f_op->get_unmapped_area; } else if (flags & MAP_SHARED) { /* * mmap_region() will call shmem_zero_setup() to create a file, * so use shmem's get_unmapped_area in case it can be huge. * do_mmap_pgoff() will clear pgoff, so match alignment. */ pgoff = 0; get_area = shmem_get_unmapped_area; } |
06abdfb47 get_unmapped_area... |
2091 2092 2093 |
addr = get_area(file, addr, len, pgoff, flags); if (IS_ERR_VALUE(addr)) return addr; |
1da177e4c Linux-2.6.12-rc2 |
2094 |
|
07ab67c8d Fix get_unmapped_... |
2095 2096 |
if (addr > TASK_SIZE - len) return -ENOMEM; |
de1741a13 mm/mmap: use offs... |
2097 |
if (offset_in_page(addr)) |
07ab67c8d Fix get_unmapped_... |
2098 |
return -EINVAL; |
06abdfb47 get_unmapped_area... |
2099 |
|
9ac4ed4bd move security_mma... |
2100 2101 |
error = security_mmap_addr(addr); return error ? error : addr; |
1da177e4c Linux-2.6.12-rc2 |
2102 2103 2104 2105 2106 |
} EXPORT_SYMBOL(get_unmapped_area); /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */ |
48aae4255 mm/mmap.c: fix co... |
2107 |
struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr) |
1da177e4c Linux-2.6.12-rc2 |
2108 |
{ |
615d6e875 mm: per-thread vm... |
2109 2110 |
struct rb_node *rb_node; struct vm_area_struct *vma; |
1da177e4c Linux-2.6.12-rc2 |
2111 |
|
841e31e5c mm/mmap.c: find_v... |
2112 |
/* Check the cache first. */ |
615d6e875 mm: per-thread vm... |
2113 2114 2115 |
vma = vmacache_find(mm, addr); if (likely(vma)) return vma; |
841e31e5c mm/mmap.c: find_v... |
2116 |
|
615d6e875 mm: per-thread vm... |
2117 |
rb_node = mm->mm_rb.rb_node; |
841e31e5c mm/mmap.c: find_v... |
2118 |
|
615d6e875 mm: per-thread vm... |
2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 |
while (rb_node) { struct vm_area_struct *tmp; tmp = rb_entry(rb_node, struct vm_area_struct, vm_rb); if (tmp->vm_end > addr) { vma = tmp; if (tmp->vm_start <= addr) break; rb_node = rb_node->rb_left; } else rb_node = rb_node->rb_right; |
1da177e4c Linux-2.6.12-rc2 |
2131 |
} |
615d6e875 mm: per-thread vm... |
2132 2133 2134 |
if (vma) vmacache_update(addr, vma); |
1da177e4c Linux-2.6.12-rc2 |
2135 2136 2137 2138 |
return vma; } EXPORT_SYMBOL(find_vma); |
6bd4837de mm: simplify find... |
2139 2140 |
/* * Same as find_vma, but also return a pointer to the previous VMA in *pprev. |
6bd4837de mm: simplify find... |
2141 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
2142 2143 2144 2145 |
struct vm_area_struct * find_vma_prev(struct mm_struct *mm, unsigned long addr, struct vm_area_struct **pprev) { |
6bd4837de mm: simplify find... |
2146 |
struct vm_area_struct *vma; |
1da177e4c Linux-2.6.12-rc2 |
2147 |
|
6bd4837de mm: simplify find... |
2148 |
vma = find_vma(mm, addr); |
83cd904d2 mm: fix find_vma_... |
2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 |
if (vma) { *pprev = vma->vm_prev; } else { struct rb_node *rb_node = mm->mm_rb.rb_node; *pprev = NULL; while (rb_node) { *pprev = rb_entry(rb_node, struct vm_area_struct, vm_rb); rb_node = rb_node->rb_right; } } |
6bd4837de mm: simplify find... |
2159 |
return vma; |
1da177e4c Linux-2.6.12-rc2 |
2160 2161 2162 2163 2164 2165 2166 |
} /* * Verify that the stack growth is acceptable and * update accounting. This is shared with both the * grow-up and grow-down cases. */ |
1be7107fb mm: larger stack ... |
2167 2168 |
static int acct_stack_growth(struct vm_area_struct *vma, unsigned long size, unsigned long grow) |
1da177e4c Linux-2.6.12-rc2 |
2169 2170 |
{ struct mm_struct *mm = vma->vm_mm; |
1be7107fb mm: larger stack ... |
2171 |
unsigned long new_start; |
1da177e4c Linux-2.6.12-rc2 |
2172 2173 |
/* address space limit tests */ |
846383359 mm: rework virtua... |
2174 |
if (!may_expand_vm(mm, vma->vm_flags, grow)) |
1da177e4c Linux-2.6.12-rc2 |
2175 2176 2177 |
return -ENOMEM; /* Stack limit test */ |
24c79d8e0 mm: use dedicated... |
2178 |
if (size > rlimit(RLIMIT_STACK)) |
1da177e4c Linux-2.6.12-rc2 |
2179 2180 2181 2182 2183 2184 2185 |
return -ENOMEM; /* mlock limit tests */ if (vma->vm_flags & VM_LOCKED) { unsigned long locked; unsigned long limit; locked = mm->locked_vm + grow; |
24c79d8e0 mm: use dedicated... |
2186 |
limit = rlimit(RLIMIT_MEMLOCK); |
59e99e5b9 mm: use rlimit he... |
2187 |
limit >>= PAGE_SHIFT; |
1da177e4c Linux-2.6.12-rc2 |
2188 2189 2190 |
if (locked > limit && !capable(CAP_IPC_LOCK)) return -ENOMEM; } |
0d59a01bc [PATCH] Don't all... |
2191 2192 2193 2194 2195 |
/* Check to ensure the stack will not grow into a hugetlb-only region */ new_start = (vma->vm_flags & VM_GROWSUP) ? vma->vm_start : vma->vm_end - size; if (is_hugepage_only_range(vma->vm_mm, new_start, size)) return -EFAULT; |
1da177e4c Linux-2.6.12-rc2 |
2196 2197 2198 2199 |
/* * Overcommit.. This must be the final test, as it will * update security statistics. */ |
05fa199d4 mm: pass correct ... |
2200 |
if (security_vm_enough_memory_mm(mm, grow)) |
1da177e4c Linux-2.6.12-rc2 |
2201 |
return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
2202 2203 |
return 0; } |
46dea3d09 [PATCH] mm: ia64 ... |
2204 |
#if defined(CONFIG_STACK_GROWSUP) || defined(CONFIG_IA64) |
1da177e4c Linux-2.6.12-rc2 |
2205 |
/* |
46dea3d09 [PATCH] mm: ia64 ... |
2206 2207 |
* PA-RISC uses this for its stack; IA64 for its Register Backing Store. * vma is the last one with address > vma->vm_end. Have to extend vma. |
1da177e4c Linux-2.6.12-rc2 |
2208 |
*/ |
46dea3d09 [PATCH] mm: ia64 ... |
2209 |
int expand_upwards(struct vm_area_struct *vma, unsigned long address) |
1da177e4c Linux-2.6.12-rc2 |
2210 |
{ |
093578147 mm: add the "stru... |
2211 |
struct mm_struct *mm = vma->vm_mm; |
1be7107fb mm: larger stack ... |
2212 2213 |
struct vm_area_struct *next; unsigned long gap_addr; |
12352d3ca mm: replace vma_l... |
2214 |
int error = 0; |
1da177e4c Linux-2.6.12-rc2 |
2215 2216 2217 |
if (!(vma->vm_flags & VM_GROWSUP)) return -EFAULT; |
bd726c90b Allow stack to gr... |
2218 |
/* Guard against exceeding limits of the address space. */ |
1be7107fb mm: larger stack ... |
2219 |
address &= PAGE_MASK; |
37511fb5c mm: fix overflow ... |
2220 |
if (address >= (TASK_SIZE & PAGE_MASK)) |
12352d3ca mm: replace vma_l... |
2221 |
return -ENOMEM; |
bd726c90b Allow stack to gr... |
2222 |
address += PAGE_SIZE; |
12352d3ca mm: replace vma_l... |
2223 |
|
1be7107fb mm: larger stack ... |
2224 2225 |
/* Enforce stack_guard_gap */ gap_addr = address + stack_guard_gap; |
bd726c90b Allow stack to gr... |
2226 2227 2228 2229 |
/* Guard against overflow */ if (gap_addr < address || gap_addr > TASK_SIZE) gap_addr = TASK_SIZE; |
1be7107fb mm: larger stack ... |
2230 |
next = vma->vm_next; |
561b5e070 mm/mmap.c: do not... |
2231 2232 |
if (next && next->vm_start < gap_addr && (next->vm_flags & (VM_WRITE|VM_READ|VM_EXEC))) { |
1be7107fb mm: larger stack ... |
2233 2234 2235 2236 |
if (!(next->vm_flags & VM_GROWSUP)) return -ENOMEM; /* Check that both stack segments have the same anon_vma? */ } |
12352d3ca mm: replace vma_l... |
2237 |
/* We must make sure the anon_vma is allocated. */ |
1da177e4c Linux-2.6.12-rc2 |
2238 2239 |
if (unlikely(anon_vma_prepare(vma))) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
2240 2241 2242 2243 2244 2245 |
/* * vma->vm_start/vm_end cannot change under us because the caller * is required to hold the mmap_sem in read mode. We need the * anon_vma lock to serialize against concurrent expand_stacks. */ |
12352d3ca mm: replace vma_l... |
2246 |
anon_vma_lock_write(vma->anon_vma); |
1da177e4c Linux-2.6.12-rc2 |
2247 2248 2249 2250 2251 2252 2253 |
/* Somebody else might have raced and expanded it already */ if (address > vma->vm_end) { unsigned long size, grow; size = address - vma->vm_start; grow = (address - vma->vm_end) >> PAGE_SHIFT; |
42c36f63a vm: fix vm_pgoff ... |
2254 2255 2256 2257 |
error = -ENOMEM; if (vma->vm_pgoff + (size >> PAGE_SHIFT) >= vma->vm_pgoff) { error = acct_stack_growth(vma, size, grow); if (!error) { |
4128997b5 mm: protect again... |
2258 2259 2260 2261 2262 |
/* * vma_gap_update() doesn't support concurrent * updates, but we only hold a shared mmap_sem * lock here, so we need to protect against * concurrent vma expansions. |
12352d3ca mm: replace vma_l... |
2263 |
* anon_vma_lock_write() doesn't help here, as |
4128997b5 mm: protect again... |
2264 2265 2266 2267 2268 |
* we don't guarantee that all growable vmas * in a mm share the same root anon vma. * So, we reuse mm->page_table_lock to guard * against concurrent vma expansions. */ |
093578147 mm: add the "stru... |
2269 |
spin_lock(&mm->page_table_lock); |
87e8827b3 mm: fix the racy ... |
2270 |
if (vma->vm_flags & VM_LOCKED) |
093578147 mm: add the "stru... |
2271 |
mm->locked_vm += grow; |
846383359 mm: rework virtua... |
2272 |
vm_stat_account(mm, vma->vm_flags, grow); |
bf181b9f9 mm anon rmap: rep... |
2273 |
anon_vma_interval_tree_pre_update_vma(vma); |
42c36f63a vm: fix vm_pgoff ... |
2274 |
vma->vm_end = address; |
bf181b9f9 mm anon rmap: rep... |
2275 |
anon_vma_interval_tree_post_update_vma(vma); |
d37371870 mm: augment vma r... |
2276 2277 2278 |
if (vma->vm_next) vma_gap_update(vma->vm_next); else |
1be7107fb mm: larger stack ... |
2279 |
mm->highest_vm_end = vm_end_gap(vma); |
093578147 mm: add the "stru... |
2280 |
spin_unlock(&mm->page_table_lock); |
4128997b5 mm: protect again... |
2281 |
|
42c36f63a vm: fix vm_pgoff ... |
2282 2283 |
perf_event_mmap(vma); } |
3af9e8592 perf: Add non-exe... |
2284 |
} |
1da177e4c Linux-2.6.12-rc2 |
2285 |
} |
12352d3ca mm: replace vma_l... |
2286 |
anon_vma_unlock_write(vma->anon_vma); |
6d50e60cd mm, thp: fix coll... |
2287 |
khugepaged_enter_vma_merge(vma, vma->vm_flags); |
093578147 mm: add the "stru... |
2288 |
validate_mm(mm); |
1da177e4c Linux-2.6.12-rc2 |
2289 2290 |
return error; } |
46dea3d09 [PATCH] mm: ia64 ... |
2291 |
#endif /* CONFIG_STACK_GROWSUP || CONFIG_IA64 */ |
1da177e4c Linux-2.6.12-rc2 |
2292 2293 2294 |
/* * vma is the first one with address < vma->vm_start. Have to extend vma. */ |
d05f3169c mm: make expand_d... |
2295 |
int expand_downwards(struct vm_area_struct *vma, |
b6a2fea39 mm: variable leng... |
2296 |
unsigned long address) |
1da177e4c Linux-2.6.12-rc2 |
2297 |
{ |
093578147 mm: add the "stru... |
2298 |
struct mm_struct *mm = vma->vm_mm; |
1be7107fb mm: larger stack ... |
2299 |
struct vm_area_struct *prev; |
de04d2973 mm: enforce min a... |
2300 |
int error = 0; |
1da177e4c Linux-2.6.12-rc2 |
2301 |
|
8869477a4 security: protect... |
2302 |
address &= PAGE_MASK; |
de04d2973 mm: enforce min a... |
2303 2304 |
if (address < mmap_min_addr) return -EPERM; |
8869477a4 security: protect... |
2305 |
|
1be7107fb mm: larger stack ... |
2306 |
/* Enforce stack_guard_gap */ |
1be7107fb mm: larger stack ... |
2307 |
prev = vma->vm_prev; |
32e4e6d5c mm/mmap.c: expand... |
2308 2309 |
/* Check that both stack segments have the same anon_vma? */ if (prev && !(prev->vm_flags & VM_GROWSDOWN) && |
561b5e070 mm/mmap.c: do not... |
2310 |
(prev->vm_flags & (VM_WRITE|VM_READ|VM_EXEC))) { |
32e4e6d5c mm/mmap.c: expand... |
2311 |
if (address - prev->vm_end < stack_guard_gap) |
1be7107fb mm: larger stack ... |
2312 |
return -ENOMEM; |
1be7107fb mm: larger stack ... |
2313 |
} |
12352d3ca mm: replace vma_l... |
2314 2315 2316 |
/* We must make sure the anon_vma is allocated. */ if (unlikely(anon_vma_prepare(vma))) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
2317 2318 2319 2320 2321 2322 |
/* * vma->vm_start/vm_end cannot change under us because the caller * is required to hold the mmap_sem in read mode. We need the * anon_vma lock to serialize against concurrent expand_stacks. */ |
12352d3ca mm: replace vma_l... |
2323 |
anon_vma_lock_write(vma->anon_vma); |
1da177e4c Linux-2.6.12-rc2 |
2324 2325 2326 2327 2328 2329 2330 |
/* Somebody else might have raced and expanded it already */ if (address < vma->vm_start) { unsigned long size, grow; size = vma->vm_end - address; grow = (vma->vm_start - address) >> PAGE_SHIFT; |
a626ca6a6 vm: fix vm_pgoff ... |
2331 2332 2333 2334 |
error = -ENOMEM; if (grow <= vma->vm_pgoff) { error = acct_stack_growth(vma, size, grow); if (!error) { |
4128997b5 mm: protect again... |
2335 2336 2337 2338 2339 |
/* * vma_gap_update() doesn't support concurrent * updates, but we only hold a shared mmap_sem * lock here, so we need to protect against * concurrent vma expansions. |
12352d3ca mm: replace vma_l... |
2340 |
* anon_vma_lock_write() doesn't help here, as |
4128997b5 mm: protect again... |
2341 2342 2343 2344 2345 |
* we don't guarantee that all growable vmas * in a mm share the same root anon vma. * So, we reuse mm->page_table_lock to guard * against concurrent vma expansions. */ |
093578147 mm: add the "stru... |
2346 |
spin_lock(&mm->page_table_lock); |
87e8827b3 mm: fix the racy ... |
2347 |
if (vma->vm_flags & VM_LOCKED) |
093578147 mm: add the "stru... |
2348 |
mm->locked_vm += grow; |
846383359 mm: rework virtua... |
2349 |
vm_stat_account(mm, vma->vm_flags, grow); |
bf181b9f9 mm anon rmap: rep... |
2350 |
anon_vma_interval_tree_pre_update_vma(vma); |
a626ca6a6 vm: fix vm_pgoff ... |
2351 2352 |
vma->vm_start = address; vma->vm_pgoff -= grow; |
bf181b9f9 mm anon rmap: rep... |
2353 |
anon_vma_interval_tree_post_update_vma(vma); |
d37371870 mm: augment vma r... |
2354 |
vma_gap_update(vma); |
093578147 mm: add the "stru... |
2355 |
spin_unlock(&mm->page_table_lock); |
4128997b5 mm: protect again... |
2356 |
|
a626ca6a6 vm: fix vm_pgoff ... |
2357 2358 |
perf_event_mmap(vma); } |
1da177e4c Linux-2.6.12-rc2 |
2359 2360 |
} } |
12352d3ca mm: replace vma_l... |
2361 |
anon_vma_unlock_write(vma->anon_vma); |
6d50e60cd mm, thp: fix coll... |
2362 |
khugepaged_enter_vma_merge(vma, vma->vm_flags); |
093578147 mm: add the "stru... |
2363 |
validate_mm(mm); |
1da177e4c Linux-2.6.12-rc2 |
2364 2365 |
return error; } |
1be7107fb mm: larger stack ... |
2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 |
/* enforced gap between the expanding stack and other mappings. */ unsigned long stack_guard_gap = 256UL<<PAGE_SHIFT; static int __init cmdline_parse_stack_guard_gap(char *p) { unsigned long val; char *endptr; val = simple_strtoul(p, &endptr, 10); if (!*endptr) stack_guard_gap = val << PAGE_SHIFT; return 0; } __setup("stack_guard_gap=", cmdline_parse_stack_guard_gap); |
b6a2fea39 mm: variable leng... |
2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 |
#ifdef CONFIG_STACK_GROWSUP int expand_stack(struct vm_area_struct *vma, unsigned long address) { return expand_upwards(vma, address); } struct vm_area_struct * find_extend_vma(struct mm_struct *mm, unsigned long addr) { struct vm_area_struct *vma, *prev; addr &= PAGE_MASK; vma = find_vma_prev(mm, addr, &prev); if (vma && (vma->vm_start <= addr)) return vma; |
1c1271850 parisc: fix find_... |
2396 |
if (!prev || expand_stack(prev, addr)) |
b6a2fea39 mm: variable leng... |
2397 |
return NULL; |
cea10a19b mm: directly use ... |
2398 |
if (prev->vm_flags & VM_LOCKED) |
fc05f5662 mm: rename __mloc... |
2399 |
populate_vma_page_range(prev, addr, prev->vm_end, NULL); |
b6a2fea39 mm: variable leng... |
2400 2401 2402 2403 2404 2405 2406 |
return prev; } #else int expand_stack(struct vm_area_struct *vma, unsigned long address) { return expand_downwards(vma, address); } |
1da177e4c Linux-2.6.12-rc2 |
2407 |
struct vm_area_struct * |
cc71aba34 mm/mmap.c: whites... |
2408 |
find_extend_vma(struct mm_struct *mm, unsigned long addr) |
1da177e4c Linux-2.6.12-rc2 |
2409 |
{ |
cc71aba34 mm/mmap.c: whites... |
2410 |
struct vm_area_struct *vma; |
1da177e4c Linux-2.6.12-rc2 |
2411 2412 2413 |
unsigned long start; addr &= PAGE_MASK; |
cc71aba34 mm/mmap.c: whites... |
2414 |
vma = find_vma(mm, addr); |
1da177e4c Linux-2.6.12-rc2 |
2415 2416 2417 2418 2419 2420 2421 2422 2423 |
if (!vma) return NULL; if (vma->vm_start <= addr) return vma; if (!(vma->vm_flags & VM_GROWSDOWN)) return NULL; start = vma->vm_start; if (expand_stack(vma, addr)) return NULL; |
cea10a19b mm: directly use ... |
2424 |
if (vma->vm_flags & VM_LOCKED) |
fc05f5662 mm: rename __mloc... |
2425 |
populate_vma_page_range(vma, addr, start, NULL); |
1da177e4c Linux-2.6.12-rc2 |
2426 2427 2428 |
return vma; } #endif |
e1d6d01ab mm: export find_e... |
2429 |
EXPORT_SYMBOL_GPL(find_extend_vma); |
1da177e4c Linux-2.6.12-rc2 |
2430 |
/* |
2c0b38146 [PATCH] mm: remov... |
2431 |
* Ok - we have the memory areas we should free on the vma list, |
1da177e4c Linux-2.6.12-rc2 |
2432 |
* so release them, and do the vma updates. |
2c0b38146 [PATCH] mm: remov... |
2433 2434 |
* * Called with the mm semaphore held. |
1da177e4c Linux-2.6.12-rc2 |
2435 |
*/ |
2c0b38146 [PATCH] mm: remov... |
2436 |
static void remove_vma_list(struct mm_struct *mm, struct vm_area_struct *vma) |
1da177e4c Linux-2.6.12-rc2 |
2437 |
{ |
4f74d2c8e vm: remove 'nr_ac... |
2438 |
unsigned long nr_accounted = 0; |
365e9c87a [PATCH] mm: updat... |
2439 2440 |
/* Update high watermark before we lower total_vm */ update_hiwater_vm(mm); |
1da177e4c Linux-2.6.12-rc2 |
2441 |
do { |
2c0b38146 [PATCH] mm: remov... |
2442 |
long nrpages = vma_pages(vma); |
4f74d2c8e vm: remove 'nr_ac... |
2443 2444 |
if (vma->vm_flags & VM_ACCOUNT) nr_accounted += nrpages; |
846383359 mm: rework virtua... |
2445 |
vm_stat_account(mm, vma->vm_flags, -nrpages); |
a8fb5618d [PATCH] mm: unlin... |
2446 |
vma = remove_vma(vma); |
146425a31 [PATCH] freepgt: ... |
2447 |
} while (vma); |
4f74d2c8e vm: remove 'nr_ac... |
2448 |
vm_unacct_memory(nr_accounted); |
1da177e4c Linux-2.6.12-rc2 |
2449 2450 2451 2452 2453 2454 |
validate_mm(mm); } /* * Get rid of page table information in the indicated region. * |
f10df6860 [PATCH] fix locki... |
2455 |
* Called with the mm semaphore held. |
1da177e4c Linux-2.6.12-rc2 |
2456 2457 |
*/ static void unmap_region(struct mm_struct *mm, |
e0da382c9 [PATCH] freepgt: ... |
2458 2459 |
struct vm_area_struct *vma, struct vm_area_struct *prev, unsigned long start, unsigned long end) |
1da177e4c Linux-2.6.12-rc2 |
2460 |
{ |
cc71aba34 mm/mmap.c: whites... |
2461 |
struct vm_area_struct *next = prev ? prev->vm_next : mm->mmap; |
d16dfc550 mm: mmu_gather re... |
2462 |
struct mmu_gather tlb; |
1da177e4c Linux-2.6.12-rc2 |
2463 2464 |
lru_add_drain(); |
2b047252d Fix TLB gather vi... |
2465 |
tlb_gather_mmu(&tlb, mm, start, end); |
365e9c87a [PATCH] mm: updat... |
2466 |
update_hiwater_rss(mm); |
4f74d2c8e vm: remove 'nr_ac... |
2467 |
unmap_vmas(&tlb, vma, start, end); |
d16dfc550 mm: mmu_gather re... |
2468 |
free_pgtables(&tlb, vma, prev ? prev->vm_end : FIRST_USER_ADDRESS, |
6ee8630e0 mm: allow arch co... |
2469 |
next ? next->vm_start : USER_PGTABLES_CEILING); |
d16dfc550 mm: mmu_gather re... |
2470 |
tlb_finish_mmu(&tlb, start, end); |
1da177e4c Linux-2.6.12-rc2 |
2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 |
} /* * Create a list of vma's touched by the unmap, removing them from the mm's * vma list as we go.. */ static void detach_vmas_to_be_unmapped(struct mm_struct *mm, struct vm_area_struct *vma, struct vm_area_struct *prev, unsigned long end) { struct vm_area_struct **insertion_point; struct vm_area_struct *tail_vma = NULL; insertion_point = (prev ? &prev->vm_next : &mm->mmap); |
297c5eee3 mm: make the vma ... |
2485 |
vma->vm_prev = NULL; |
1da177e4c Linux-2.6.12-rc2 |
2486 |
do { |
d37371870 mm: augment vma r... |
2487 |
vma_rb_erase(vma, &mm->mm_rb); |
1da177e4c Linux-2.6.12-rc2 |
2488 2489 2490 2491 2492 |
mm->map_count--; tail_vma = vma; vma = vma->vm_next; } while (vma && vma->vm_start < end); *insertion_point = vma; |
d37371870 mm: augment vma r... |
2493 |
if (vma) { |
297c5eee3 mm: make the vma ... |
2494 |
vma->vm_prev = prev; |
d37371870 mm: augment vma r... |
2495 2496 |
vma_gap_update(vma); } else |
1be7107fb mm: larger stack ... |
2497 |
mm->highest_vm_end = prev ? vm_end_gap(prev) : 0; |
1da177e4c Linux-2.6.12-rc2 |
2498 |
tail_vma->vm_next = NULL; |
615d6e875 mm: per-thread vm... |
2499 2500 2501 |
/* Kill the cache */ vmacache_invalidate(mm); |
1da177e4c Linux-2.6.12-rc2 |
2502 2503 2504 |
} /* |
def5efe03 mm, madvise: fail... |
2505 2506 |
* __split_vma() bypasses sysctl_max_map_count checking. We use this where it * has already been checked or doesn't make sense to fail. |
1da177e4c Linux-2.6.12-rc2 |
2507 |
*/ |
def5efe03 mm, madvise: fail... |
2508 2509 |
int __split_vma(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long addr, int new_below) |
1da177e4c Linux-2.6.12-rc2 |
2510 |
{ |
1da177e4c Linux-2.6.12-rc2 |
2511 |
struct vm_area_struct *new; |
e39758912 mm/mmap.c: simpli... |
2512 |
int err; |
1da177e4c Linux-2.6.12-rc2 |
2513 |
|
31383c686 mm, hugetlbfs: in... |
2514 2515 2516 2517 2518 |
if (vma->vm_ops && vma->vm_ops->split) { err = vma->vm_ops->split(vma, addr); if (err) return err; } |
1da177e4c Linux-2.6.12-rc2 |
2519 |
|
3928d4f5e mm: use helper fu... |
2520 |
new = vm_area_dup(vma); |
1da177e4c Linux-2.6.12-rc2 |
2521 |
if (!new) |
e39758912 mm/mmap.c: simpli... |
2522 |
return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
2523 |
|
1da177e4c Linux-2.6.12-rc2 |
2524 2525 2526 2527 2528 2529 |
if (new_below) new->vm_end = addr; else { new->vm_start = addr; new->vm_pgoff += ((addr - vma->vm_start) >> PAGE_SHIFT); } |
ef0855d33 mm: mempolicy: tu... |
2530 2531 |
err = vma_dup_policy(vma, new); if (err) |
5beb49305 mm: change anon_v... |
2532 |
goto out_free_vma; |
1da177e4c Linux-2.6.12-rc2 |
2533 |
|
c4ea95d7c mm: fix anon_vma_... |
2534 2535 |
err = anon_vma_clone(new, vma); if (err) |
5beb49305 mm: change anon_v... |
2536 |
goto out_free_mpol; |
e9714acf8 mm: kill vma flag... |
2537 |
if (new->vm_file) |
1da177e4c Linux-2.6.12-rc2 |
2538 2539 2540 2541 2542 2543 |
get_file(new->vm_file); if (new->vm_ops && new->vm_ops->open) new->vm_ops->open(new); if (new_below) |
5beb49305 mm: change anon_v... |
2544 |
err = vma_adjust(vma, addr, vma->vm_end, vma->vm_pgoff + |
1da177e4c Linux-2.6.12-rc2 |
2545 2546 |
((addr - new->vm_start) >> PAGE_SHIFT), new); else |
5beb49305 mm: change anon_v... |
2547 |
err = vma_adjust(vma, vma->vm_start, addr, vma->vm_pgoff, new); |
1da177e4c Linux-2.6.12-rc2 |
2548 |
|
5beb49305 mm: change anon_v... |
2549 2550 2551 2552 2553 |
/* Success. */ if (!err) return 0; /* Clean everything up if vma_adjust failed. */ |
589275338 mmap: check ->vm_... |
2554 2555 |
if (new->vm_ops && new->vm_ops->close) new->vm_ops->close(new); |
e9714acf8 mm: kill vma flag... |
2556 |
if (new->vm_file) |
5beb49305 mm: change anon_v... |
2557 |
fput(new->vm_file); |
2aeadc30d mmap: call unlink... |
2558 |
unlink_anon_vmas(new); |
5beb49305 mm: change anon_v... |
2559 |
out_free_mpol: |
ef0855d33 mm: mempolicy: tu... |
2560 |
mpol_put(vma_policy(new)); |
5beb49305 mm: change anon_v... |
2561 |
out_free_vma: |
3928d4f5e mm: use helper fu... |
2562 |
vm_area_free(new); |
5beb49305 mm: change anon_v... |
2563 |
return err; |
1da177e4c Linux-2.6.12-rc2 |
2564 |
} |
659ace584 mmap: don't retur... |
2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 |
/* * Split a vma into two pieces at address 'addr', a new vma is allocated * either for the first part or the tail. */ int split_vma(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long addr, int new_below) { if (mm->map_count >= sysctl_max_map_count) return -ENOMEM; return __split_vma(mm, vma, addr, new_below); } |
1da177e4c Linux-2.6.12-rc2 |
2577 2578 2579 2580 2581 |
/* Munmap is split into 2 main parts -- this part which finds * what needs doing, and the areas themselves, which do the * work. This now handles partial unmappings. * Jeremy Fitzhardinge <jeremy@goop.org> */ |
897ab3e0c userfaultfd: non-... |
2582 2583 |
int do_munmap(struct mm_struct *mm, unsigned long start, size_t len, struct list_head *uf) |
1da177e4c Linux-2.6.12-rc2 |
2584 2585 |
{ unsigned long end; |
146425a31 [PATCH] freepgt: ... |
2586 |
struct vm_area_struct *vma, *prev, *last; |
1da177e4c Linux-2.6.12-rc2 |
2587 |
|
de1741a13 mm/mmap: use offs... |
2588 |
if ((offset_in_page(start)) || start > TASK_SIZE || len > TASK_SIZE-start) |
1da177e4c Linux-2.6.12-rc2 |
2589 |
return -EINVAL; |
cc71aba34 mm/mmap.c: whites... |
2590 2591 |
len = PAGE_ALIGN(len); if (len == 0) |
1da177e4c Linux-2.6.12-rc2 |
2592 2593 2594 |
return -EINVAL; /* Find the first overlapping VMA */ |
9be34c9d5 mm: get rid of th... |
2595 |
vma = find_vma(mm, start); |
146425a31 [PATCH] freepgt: ... |
2596 |
if (!vma) |
1da177e4c Linux-2.6.12-rc2 |
2597 |
return 0; |
9be34c9d5 mm: get rid of th... |
2598 |
prev = vma->vm_prev; |
146425a31 [PATCH] freepgt: ... |
2599 |
/* we have start < vma->vm_end */ |
1da177e4c Linux-2.6.12-rc2 |
2600 2601 2602 |
/* if it doesn't overlap, we have nothing.. */ end = start + len; |
146425a31 [PATCH] freepgt: ... |
2603 |
if (vma->vm_start >= end) |
1da177e4c Linux-2.6.12-rc2 |
2604 2605 2606 2607 2608 2609 2610 2611 2612 |
return 0; /* * If we need to split any vma, do it now to save pain later. * * Note: mremap's move_vma VM_ACCOUNT handling assumes a partially * unmapped vm_area_struct will remain in use: so lower split_vma * places tmp vma above, and higher split_vma places tmp vma below. */ |
146425a31 [PATCH] freepgt: ... |
2613 |
if (start > vma->vm_start) { |
659ace584 mmap: don't retur... |
2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 |
int error; /* * Make sure that map_count on return from munmap() will * not exceed its limit; but let map_count go just above * its limit temporarily, to help free resources as expected. */ if (end < vma->vm_end && mm->map_count >= sysctl_max_map_count) return -ENOMEM; error = __split_vma(mm, vma, start, 0); |
1da177e4c Linux-2.6.12-rc2 |
2625 2626 |
if (error) return error; |
146425a31 [PATCH] freepgt: ... |
2627 |
prev = vma; |
1da177e4c Linux-2.6.12-rc2 |
2628 2629 2630 2631 2632 |
} /* Does it split the last one? */ last = find_vma(mm, end); if (last && end > last->vm_start) { |
659ace584 mmap: don't retur... |
2633 |
int error = __split_vma(mm, last, end, 1); |
1da177e4c Linux-2.6.12-rc2 |
2634 2635 2636 |
if (error) return error; } |
cc71aba34 mm/mmap.c: whites... |
2637 |
vma = prev ? prev->vm_next : mm->mmap; |
1da177e4c Linux-2.6.12-rc2 |
2638 |
|
2376dd7ce userfaultfd: call... |
2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 |
if (unlikely(uf)) { /* * If userfaultfd_unmap_prep returns an error the vmas * will remain splitted, but userland will get a * highly unexpected error anyway. This is no * different than the case where the first of the two * __split_vma fails, but we don't undo the first * split, despite we could. This is unlikely enough * failure that it's not worth optimizing it for. */ int error = userfaultfd_unmap_prep(vma, start, end, uf); if (error) return error; } |
1da177e4c Linux-2.6.12-rc2 |
2653 |
/* |
ba470de43 mmap: handle mloc... |
2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 |
* unlock any mlock()ed ranges before detaching vmas */ if (mm->locked_vm) { struct vm_area_struct *tmp = vma; while (tmp && tmp->vm_start < end) { if (tmp->vm_flags & VM_LOCKED) { mm->locked_vm -= vma_pages(tmp); munlock_vma_pages_all(tmp); } tmp = tmp->vm_next; } } /* |
1da177e4c Linux-2.6.12-rc2 |
2668 2669 |
* Remove the vma's, and unmap the actual pages */ |
146425a31 [PATCH] freepgt: ... |
2670 2671 |
detach_vmas_to_be_unmapped(mm, vma, prev, end); unmap_region(mm, vma, prev, start, end); |
1da177e4c Linux-2.6.12-rc2 |
2672 |
|
1de4fa14e x86, mpx: Cleanup... |
2673 |
arch_unmap(mm, vma, start, end); |
1da177e4c Linux-2.6.12-rc2 |
2674 |
/* Fix up all other VM information */ |
2c0b38146 [PATCH] mm: remov... |
2675 |
remove_vma_list(mm, vma); |
1da177e4c Linux-2.6.12-rc2 |
2676 2677 2678 |
return 0; } |
1da177e4c Linux-2.6.12-rc2 |
2679 |
|
bfce281c2 kill mm argument ... |
2680 |
int vm_munmap(unsigned long start, size_t len) |
1da177e4c Linux-2.6.12-rc2 |
2681 2682 |
{ int ret; |
bfce281c2 kill mm argument ... |
2683 |
struct mm_struct *mm = current->mm; |
897ab3e0c userfaultfd: non-... |
2684 |
LIST_HEAD(uf); |
1da177e4c Linux-2.6.12-rc2 |
2685 |
|
ae7987835 mm: make vm_munma... |
2686 2687 |
if (down_write_killable(&mm->mmap_sem)) return -EINTR; |
897ab3e0c userfaultfd: non-... |
2688 |
ret = do_munmap(mm, start, len, &uf); |
1da177e4c Linux-2.6.12-rc2 |
2689 |
up_write(&mm->mmap_sem); |
897ab3e0c userfaultfd: non-... |
2690 |
userfaultfd_unmap_complete(mm, &uf); |
1da177e4c Linux-2.6.12-rc2 |
2691 2692 |
return ret; } |
a46ef99d8 VM: add "vm_munma... |
2693 2694 2695 2696 2697 |
EXPORT_SYMBOL(vm_munmap); SYSCALL_DEFINE2(munmap, unsigned long, addr, size_t, len) { profile_munmap(addr); |
846b1a0f1 mm: call vm_munma... |
2698 |
return vm_munmap(addr, len); |
a46ef99d8 VM: add "vm_munma... |
2699 |
} |
1da177e4c Linux-2.6.12-rc2 |
2700 |
|
c8d78c182 mm: replace remap... |
2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 |
/* * Emulation of deprecated remap_file_pages() syscall. */ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size, unsigned long, prot, unsigned long, pgoff, unsigned long, flags) { struct mm_struct *mm = current->mm; struct vm_area_struct *vma; unsigned long populate = 0; unsigned long ret = -EINVAL; struct file *file; |
ad56b738c docs/vm: rename d... |
2714 2715 |
pr_warn_once("%s (%d) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.rst. ", |
756a025f0 mm: coalesce spli... |
2716 |
current->comm, current->pid); |
c8d78c182 mm: replace remap... |
2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 |
if (prot) return ret; start = start & PAGE_MASK; size = size & PAGE_MASK; if (start + size <= start) return ret; /* Does pgoff wrap? */ if (pgoff + (size >> PAGE_SHIFT) < pgoff) return ret; |
dc0ef0df7 mm: make mmap_sem... |
2729 2730 |
if (down_write_killable(&mm->mmap_sem)) return -EINTR; |
c8d78c182 mm: replace remap... |
2731 2732 2733 2734 |
vma = find_vma(mm, start); if (!vma || !(vma->vm_flags & VM_SHARED)) goto out; |
48f7df329 mm: fix regressio... |
2735 |
if (start < vma->vm_start) |
c8d78c182 mm: replace remap... |
2736 |
goto out; |
48f7df329 mm: fix regressio... |
2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 |
if (start + size > vma->vm_end) { struct vm_area_struct *next; for (next = vma->vm_next; next; next = next->vm_next) { /* hole between vmas ? */ if (next->vm_start != next->vm_prev->vm_end) goto out; if (next->vm_file != vma->vm_file) goto out; if (next->vm_flags != vma->vm_flags) goto out; if (start + size <= next->vm_end) break; } if (!next) goto out; |
c8d78c182 mm: replace remap... |
2757 2758 2759 2760 2761 2762 2763 2764 2765 |
} prot |= vma->vm_flags & VM_READ ? PROT_READ : 0; prot |= vma->vm_flags & VM_WRITE ? PROT_WRITE : 0; prot |= vma->vm_flags & VM_EXEC ? PROT_EXEC : 0; flags &= MAP_NONBLOCK; flags |= MAP_SHARED | MAP_FIXED | MAP_POPULATE; if (vma->vm_flags & VM_LOCKED) { |
48f7df329 mm: fix regressio... |
2766 |
struct vm_area_struct *tmp; |
c8d78c182 mm: replace remap... |
2767 |
flags |= MAP_LOCKED; |
48f7df329 mm: fix regressio... |
2768 |
|
c8d78c182 mm: replace remap... |
2769 |
/* drop PG_Mlocked flag for over-mapped range */ |
48f7df329 mm: fix regressio... |
2770 2771 |
for (tmp = vma; tmp->vm_start >= start + size; tmp = tmp->vm_next) { |
9a73f61bd thp, mlock: do no... |
2772 2773 2774 2775 2776 |
/* * Split pmd and munlock page on the border * of the range. */ vma_adjust_trans_huge(tmp, start, start + size, 0); |
48f7df329 mm: fix regressio... |
2777 2778 2779 2780 |
munlock_vma_pages_range(tmp, max(tmp->vm_start, start), min(tmp->vm_end, start + size)); } |
c8d78c182 mm: replace remap... |
2781 2782 2783 2784 |
} file = get_file(vma->vm_file); ret = do_mmap_pgoff(vma->vm_file, start, size, |
897ab3e0c userfaultfd: non-... |
2785 |
prot, flags, pgoff, &populate, NULL); |
c8d78c182 mm: replace remap... |
2786 2787 2788 2789 2790 2791 2792 2793 2794 |
fput(file); out: up_write(&mm->mmap_sem); if (populate) mm_populate(ret, populate); if (!IS_ERR_VALUE(ret)) ret = 0; return ret; } |
1da177e4c Linux-2.6.12-rc2 |
2795 2796 |
static inline void verify_mm_writelocked(struct mm_struct *mm) { |
a241ec65a [PATCH] RCU tortu... |
2797 |
#ifdef CONFIG_DEBUG_VM |
1da177e4c Linux-2.6.12-rc2 |
2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 |
if (unlikely(down_read_trylock(&mm->mmap_sem))) { WARN_ON(1); up_read(&mm->mmap_sem); } #endif } /* * this is really a simplified "do_mmap". it only handles * anonymous maps. eventually we may be able to do some * brk-specific accounting here. */ |
bb177a732 mm: do not bug_on... |
2810 |
static int do_brk_flags(unsigned long addr, unsigned long len, unsigned long flags, struct list_head *uf) |
1da177e4c Linux-2.6.12-rc2 |
2811 |
{ |
cc71aba34 mm/mmap.c: whites... |
2812 2813 |
struct mm_struct *mm = current->mm; struct vm_area_struct *vma, *prev; |
cc71aba34 mm/mmap.c: whites... |
2814 |
struct rb_node **rb_link, *rb_parent; |
1da177e4c Linux-2.6.12-rc2 |
2815 |
pgoff_t pgoff = addr >> PAGE_SHIFT; |
3a4597568 [PATCH] IA64,spar... |
2816 |
int error; |
1da177e4c Linux-2.6.12-rc2 |
2817 |
|
16e72e9b3 powerpc: do not m... |
2818 2819 2820 2821 |
/* Until we need other flags, refuse anything except VM_EXEC. */ if ((flags & (~VM_EXEC)) != 0) return -EINVAL; flags |= VM_DATA_DEFAULT_FLAGS | VM_ACCOUNT | mm->def_flags; |
3a4597568 [PATCH] IA64,spar... |
2822 |
|
2c6a10161 switch do_brk() t... |
2823 |
error = get_unmapped_area(NULL, addr, len, 0, MAP_FIXED); |
de1741a13 mm/mmap: use offs... |
2824 |
if (offset_in_page(error)) |
3a4597568 [PATCH] IA64,spar... |
2825 |
return error; |
363ee17f0 mm/mmap.c: add ml... |
2826 2827 2828 |
error = mlock_future_check(mm, mm->def_flags, len); if (error) return error; |
1da177e4c Linux-2.6.12-rc2 |
2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 |
/* * mm->mmap_sem is required to protect against another thread * changing the mappings in case we sleep. */ verify_mm_writelocked(mm); /* * Clear old maps. this also does some error checking for us */ |
9fcd14571 mm/mmap.c: use wh... |
2839 2840 |
while (find_vma_links(mm, addr, addr + len, &prev, &rb_link, &rb_parent)) { |
897ab3e0c userfaultfd: non-... |
2841 |
if (do_munmap(mm, addr, len, uf)) |
1da177e4c Linux-2.6.12-rc2 |
2842 |
return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
2843 2844 2845 |
} /* Check against address space limits *after* clearing old maps... */ |
846383359 mm: rework virtua... |
2846 |
if (!may_expand_vm(mm, flags, len >> PAGE_SHIFT)) |
1da177e4c Linux-2.6.12-rc2 |
2847 2848 2849 2850 |
return -ENOMEM; if (mm->map_count > sysctl_max_map_count) return -ENOMEM; |
191c54244 mm: collapse secu... |
2851 |
if (security_vm_enough_memory_mm(mm, len >> PAGE_SHIFT)) |
1da177e4c Linux-2.6.12-rc2 |
2852 |
return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
2853 |
/* Can we just expand an old private anonymous mapping? */ |
ba470de43 mmap: handle mloc... |
2854 |
vma = vma_merge(mm, prev, addr, addr + len, flags, |
19a809afe userfaultfd: teac... |
2855 |
NULL, NULL, pgoff, NULL, NULL_VM_UFFD_CTX); |
ba470de43 mmap: handle mloc... |
2856 |
if (vma) |
1da177e4c Linux-2.6.12-rc2 |
2857 2858 2859 2860 2861 |
goto out; /* * create a vma struct for an anonymous mapping */ |
490fc0538 mm: make vm_area_... |
2862 |
vma = vm_area_alloc(mm); |
1da177e4c Linux-2.6.12-rc2 |
2863 2864 2865 2866 |
if (!vma) { vm_unacct_memory(len >> PAGE_SHIFT); return -ENOMEM; } |
1da177e4c Linux-2.6.12-rc2 |
2867 |
|
bfd40eaff mm: fix vma_is_an... |
2868 |
vma_set_anonymous(vma); |
1da177e4c Linux-2.6.12-rc2 |
2869 2870 2871 2872 |
vma->vm_start = addr; vma->vm_end = addr + len; vma->vm_pgoff = pgoff; vma->vm_flags = flags; |
3ed75eb8f setup vma->vm_pag... |
2873 |
vma->vm_page_prot = vm_get_page_prot(flags); |
1da177e4c Linux-2.6.12-rc2 |
2874 2875 |
vma_link(mm, vma, prev, rb_link, rb_parent); out: |
3af9e8592 perf: Add non-exe... |
2876 |
perf_event_mmap(vma); |
1da177e4c Linux-2.6.12-rc2 |
2877 |
mm->total_vm += len >> PAGE_SHIFT; |
846383359 mm: rework virtua... |
2878 |
mm->data_vm += len >> PAGE_SHIFT; |
128557ffe mm: use mm_popula... |
2879 2880 |
if (flags & VM_LOCKED) mm->locked_vm += (len >> PAGE_SHIFT); |
d9104d1ca mm: track vma cha... |
2881 |
vma->vm_flags |= VM_SOFTDIRTY; |
5d22fc25d mm: remove more I... |
2882 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
2883 |
} |
bb177a732 mm: do not bug_on... |
2884 |
int vm_brk_flags(unsigned long addr, unsigned long request, unsigned long flags) |
e4eb1ff61 VM: add "vm_brk()... |
2885 2886 |
{ struct mm_struct *mm = current->mm; |
bb177a732 mm: do not bug_on... |
2887 |
unsigned long len; |
5d22fc25d mm: remove more I... |
2888 |
int ret; |
128557ffe mm: use mm_popula... |
2889 |
bool populate; |
897ab3e0c userfaultfd: non-... |
2890 |
LIST_HEAD(uf); |
e4eb1ff61 VM: add "vm_brk()... |
2891 |
|
bb177a732 mm: do not bug_on... |
2892 2893 2894 2895 2896 |
len = PAGE_ALIGN(request); if (len < request) return -ENOMEM; if (!len) return 0; |
2d6c92824 mm: make vm_brk k... |
2897 2898 |
if (down_write_killable(&mm->mmap_sem)) return -EINTR; |
897ab3e0c userfaultfd: non-... |
2899 |
ret = do_brk_flags(addr, len, flags, &uf); |
128557ffe mm: use mm_popula... |
2900 |
populate = ((mm->def_flags & VM_LOCKED) != 0); |
e4eb1ff61 VM: add "vm_brk()... |
2901 |
up_write(&mm->mmap_sem); |
897ab3e0c userfaultfd: non-... |
2902 |
userfaultfd_unmap_complete(mm, &uf); |
5d22fc25d mm: remove more I... |
2903 |
if (populate && !ret) |
128557ffe mm: use mm_popula... |
2904 |
mm_populate(addr, len); |
e4eb1ff61 VM: add "vm_brk()... |
2905 2906 |
return ret; } |
16e72e9b3 powerpc: do not m... |
2907 2908 2909 2910 2911 2912 |
EXPORT_SYMBOL(vm_brk_flags); int vm_brk(unsigned long addr, unsigned long len) { return vm_brk_flags(addr, len, 0); } |
e4eb1ff61 VM: add "vm_brk()... |
2913 |
EXPORT_SYMBOL(vm_brk); |
1da177e4c Linux-2.6.12-rc2 |
2914 2915 2916 2917 |
/* Release all mmaps. */ void exit_mmap(struct mm_struct *mm) { |
d16dfc550 mm: mmu_gather re... |
2918 |
struct mmu_gather tlb; |
ba470de43 mmap: handle mloc... |
2919 |
struct vm_area_struct *vma; |
1da177e4c Linux-2.6.12-rc2 |
2920 |
unsigned long nr_accounted = 0; |
d6dd61c83 [PATCH] x86: PARA... |
2921 |
/* mm's last user has gone, and its about to be pulled down */ |
cddb8a5c1 mmu-notifiers: core |
2922 |
mmu_notifier_release(mm); |
d6dd61c83 [PATCH] x86: PARA... |
2923 |
|
27ae357fa mm, oom: fix conc... |
2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 |
if (unlikely(mm_is_oom_victim(mm))) { /* * Manually reap the mm to free as much memory as possible. * Then, as the oom reaper does, set MMF_OOM_SKIP to disregard * this mm from further consideration. Taking mm->mmap_sem for * write after setting MMF_OOM_SKIP will guarantee that the oom * reaper will not run on this mm again after mmap_sem is * dropped. * * Nothing can be holding mm->mmap_sem here and the above call * to mmu_notifier_release(mm) ensures mmu notifier callbacks in * __oom_reap_task_mm() will not block. * * This needs to be done before calling munlock_vma_pages_all(), * which clears VM_LOCKED, otherwise the oom reaper cannot * reliably test it. */ |
93065ac75 mm, oom: distingu... |
2941 |
(void)__oom_reap_task_mm(mm); |
27ae357fa mm, oom: fix conc... |
2942 2943 2944 2945 2946 |
set_bit(MMF_OOM_SKIP, &mm->flags); down_write(&mm->mmap_sem); up_write(&mm->mmap_sem); } |
ba470de43 mmap: handle mloc... |
2947 2948 2949 2950 2951 2952 2953 2954 |
if (mm->locked_vm) { vma = mm->mmap; while (vma) { if (vma->vm_flags & VM_LOCKED) munlock_vma_pages_all(vma); vma = vma->vm_next; } } |
9480c53e9 mm: rearrange exi... |
2955 2956 |
arch_exit_mmap(mm); |
ba470de43 mmap: handle mloc... |
2957 |
vma = mm->mmap; |
9480c53e9 mm: rearrange exi... |
2958 2959 |
if (!vma) /* Can happen if dup_mmap() received an OOM */ return; |
1da177e4c Linux-2.6.12-rc2 |
2960 |
lru_add_drain(); |
1da177e4c Linux-2.6.12-rc2 |
2961 |
flush_cache_mm(mm); |
2b047252d Fix TLB gather vi... |
2962 |
tlb_gather_mmu(&tlb, mm, 0, -1); |
901608d90 mm: introduce get... |
2963 |
/* update_hiwater_rss(mm) here? but nobody should be looking */ |
e0da382c9 [PATCH] freepgt: ... |
2964 |
/* Use -1 here to ensure all VMAs in the mm are unmapped */ |
4f74d2c8e vm: remove 'nr_ac... |
2965 |
unmap_vmas(&tlb, vma, 0, -1); |
6ee8630e0 mm: allow arch co... |
2966 |
free_pgtables(&tlb, vma, FIRST_USER_ADDRESS, USER_PGTABLES_CEILING); |
853f5e264 VM: don't bother ... |
2967 |
tlb_finish_mmu(&tlb, 0, -1); |
1da177e4c Linux-2.6.12-rc2 |
2968 |
|
1da177e4c Linux-2.6.12-rc2 |
2969 |
/* |
8f4f8c164 [PATCH] mm: unlin... |
2970 2971 |
* Walk the list again, actually closing and freeing it, * with preemption enabled, without holding any MM locks. |
1da177e4c Linux-2.6.12-rc2 |
2972 |
*/ |
4f74d2c8e vm: remove 'nr_ac... |
2973 2974 2975 |
while (vma) { if (vma->vm_flags & VM_ACCOUNT) nr_accounted += vma_pages(vma); |
a8fb5618d [PATCH] mm: unlin... |
2976 |
vma = remove_vma(vma); |
4f74d2c8e vm: remove 'nr_ac... |
2977 2978 |
} vm_unacct_memory(nr_accounted); |
1da177e4c Linux-2.6.12-rc2 |
2979 2980 2981 2982 |
} /* Insert vm structure into process list sorted by address * and into the inode's i_mmap tree. If vm_file is non-NULL |
c8c06efa8 mm: convert i_mma... |
2983 |
* then i_mmap_rwsem is taken here. |
1da177e4c Linux-2.6.12-rc2 |
2984 |
*/ |
6597d7833 mm/mmap.c: replac... |
2985 |
int insert_vm_struct(struct mm_struct *mm, struct vm_area_struct *vma) |
1da177e4c Linux-2.6.12-rc2 |
2986 |
{ |
6597d7833 mm/mmap.c: replac... |
2987 2988 |
struct vm_area_struct *prev; struct rb_node **rb_link, *rb_parent; |
1da177e4c Linux-2.6.12-rc2 |
2989 |
|
c9d13f5fc mm/mmap.c:insert_... |
2990 2991 2992 2993 2994 2995 |
if (find_vma_links(mm, vma->vm_start, vma->vm_end, &prev, &rb_link, &rb_parent)) return -ENOMEM; if ((vma->vm_flags & VM_ACCOUNT) && security_vm_enough_memory_mm(mm, vma_pages(vma))) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 |
/* * The vm_pgoff of a purely anonymous vma should be irrelevant * until its first write fault, when page's anon_vma and index * are set. But now set the vm_pgoff it will almost certainly * end up with (unless mremap moves it elsewhere before that * first wfault), so /proc/pid/maps tells a consistent story. * * By setting it to reflect the virtual start address of the * vma, merges and splits can happen in a seamless way, just * using the existing file pgoff checks and manipulations. * Similarly in do_mmap_pgoff and in do_brk. */ |
8a9cc3b55 mmap: fix the usa... |
3008 |
if (vma_is_anonymous(vma)) { |
1da177e4c Linux-2.6.12-rc2 |
3009 3010 3011 |
BUG_ON(vma->anon_vma); vma->vm_pgoff = vma->vm_start >> PAGE_SHIFT; } |
2b1444983 uprobes, mm, x86:... |
3012 |
|
1da177e4c Linux-2.6.12-rc2 |
3013 3014 3015 3016 3017 3018 3019 3020 3021 |
vma_link(mm, vma, prev, rb_link, rb_parent); return 0; } /* * Copy the vma structure to a new location in the same mm, * prior to moving page table entries, to effect an mremap move. */ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap, |
38a76013a mm: avoid taking ... |
3022 3023 |
unsigned long addr, unsigned long len, pgoff_t pgoff, bool *need_rmap_locks) |
1da177e4c Linux-2.6.12-rc2 |
3024 3025 3026 3027 3028 3029 |
{ struct vm_area_struct *vma = *vmap; unsigned long vma_start = vma->vm_start; struct mm_struct *mm = vma->vm_mm; struct vm_area_struct *new_vma, *prev; struct rb_node **rb_link, *rb_parent; |
948f017b0 mremap: enforce r... |
3030 |
bool faulted_in_anon_vma = true; |
1da177e4c Linux-2.6.12-rc2 |
3031 3032 3033 3034 3035 |
/* * If anonymous vma has not yet been faulted, update new pgoff * to match new location, to increase its chance of merging. */ |
ce75799b8 mremap: fix the w... |
3036 |
if (unlikely(vma_is_anonymous(vma) && !vma->anon_vma)) { |
1da177e4c Linux-2.6.12-rc2 |
3037 |
pgoff = addr >> PAGE_SHIFT; |
948f017b0 mremap: enforce r... |
3038 3039 |
faulted_in_anon_vma = false; } |
1da177e4c Linux-2.6.12-rc2 |
3040 |
|
6597d7833 mm/mmap.c: replac... |
3041 3042 |
if (find_vma_links(mm, addr, addr + len, &prev, &rb_link, &rb_parent)) return NULL; /* should never get here */ |
1da177e4c Linux-2.6.12-rc2 |
3043 |
new_vma = vma_merge(mm, prev, addr, addr + len, vma->vm_flags, |
19a809afe userfaultfd: teac... |
3044 3045 |
vma->anon_vma, vma->vm_file, pgoff, vma_policy(vma), vma->vm_userfaultfd_ctx); |
1da177e4c Linux-2.6.12-rc2 |
3046 3047 3048 3049 |
if (new_vma) { /* * Source vma may have been merged into new_vma */ |
948f017b0 mremap: enforce r... |
3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 |
if (unlikely(vma_start >= new_vma->vm_start && vma_start < new_vma->vm_end)) { /* * The only way we can get a vma_merge with * self during an mremap is if the vma hasn't * been faulted in yet and we were allowed to * reset the dst vma->vm_pgoff to the * destination address of the mremap to allow * the merge to happen. mremap must change the * vm_pgoff linearity between src and dst vmas * (in turn preventing a vma_merge) to be * safe. It is only safe to keep the vm_pgoff * linear if there are no pages mapped yet. */ |
81d1b09c6 mm: convert a few... |
3064 |
VM_BUG_ON_VMA(faulted_in_anon_vma, new_vma); |
38a76013a mm: avoid taking ... |
3065 |
*vmap = vma = new_vma; |
108d6642a mm anon rmap: rem... |
3066 |
} |
38a76013a mm: avoid taking ... |
3067 |
*need_rmap_locks = (new_vma->vm_pgoff <= vma->vm_pgoff); |
1da177e4c Linux-2.6.12-rc2 |
3068 |
} else { |
3928d4f5e mm: use helper fu... |
3069 |
new_vma = vm_area_dup(vma); |
e39758912 mm/mmap.c: simpli... |
3070 3071 |
if (!new_vma) goto out; |
e39758912 mm/mmap.c: simpli... |
3072 3073 3074 3075 3076 |
new_vma->vm_start = addr; new_vma->vm_end = addr + len; new_vma->vm_pgoff = pgoff; if (vma_dup_policy(vma, new_vma)) goto out_free_vma; |
e39758912 mm/mmap.c: simpli... |
3077 3078 3079 3080 3081 3082 3083 3084 |
if (anon_vma_clone(new_vma, vma)) goto out_free_mempol; if (new_vma->vm_file) get_file(new_vma->vm_file); if (new_vma->vm_ops && new_vma->vm_ops->open) new_vma->vm_ops->open(new_vma); vma_link(mm, new_vma, prev, rb_link, rb_parent); *need_rmap_locks = false; |
1da177e4c Linux-2.6.12-rc2 |
3085 3086 |
} return new_vma; |
5beb49305 mm: change anon_v... |
3087 |
|
e39758912 mm/mmap.c: simpli... |
3088 |
out_free_mempol: |
ef0855d33 mm: mempolicy: tu... |
3089 |
mpol_put(vma_policy(new_vma)); |
e39758912 mm/mmap.c: simpli... |
3090 |
out_free_vma: |
3928d4f5e mm: use helper fu... |
3091 |
vm_area_free(new_vma); |
e39758912 mm/mmap.c: simpli... |
3092 |
out: |
5beb49305 mm: change anon_v... |
3093 |
return NULL; |
1da177e4c Linux-2.6.12-rc2 |
3094 |
} |
119f657c7 [PATCH] RLIMIT_AS... |
3095 3096 3097 3098 3099 |
/* * Return true if the calling process may expand its vm space by the passed * number of pages */ |
846383359 mm: rework virtua... |
3100 |
bool may_expand_vm(struct mm_struct *mm, vm_flags_t flags, unsigned long npages) |
119f657c7 [PATCH] RLIMIT_AS... |
3101 |
{ |
846383359 mm: rework virtua... |
3102 3103 |
if (mm->total_vm + npages > rlimit(RLIMIT_AS) >> PAGE_SHIFT) return false; |
119f657c7 [PATCH] RLIMIT_AS... |
3104 |
|
d977d56ce mm: warn about Vm... |
3105 3106 |
if (is_data_mapping(flags) && mm->data_vm + npages > rlimit(RLIMIT_DATA) >> PAGE_SHIFT) { |
f4fcd5584 mm: enable RLIMIT... |
3107 3108 3109 3110 |
/* Workaround for Valgrind */ if (rlimit(RLIMIT_DATA) == 0 && mm->data_vm + npages <= rlimit_max(RLIMIT_DATA) >> PAGE_SHIFT) return true; |
57a7702b1 mm: always print ... |
3111 3112 3113 3114 3115 3116 3117 3118 3119 |
pr_warn_once("%s (%d): VmData %lu exceed data ulimit %lu. Update limits%s. ", current->comm, current->pid, (mm->data_vm + npages) << PAGE_SHIFT, rlimit(RLIMIT_DATA), ignore_rlimit_data ? "" : " or use boot option ignore_rlimit_data"); if (!ignore_rlimit_data) |
d977d56ce mm: warn about Vm... |
3120 3121 |
return false; } |
119f657c7 [PATCH] RLIMIT_AS... |
3122 |
|
846383359 mm: rework virtua... |
3123 3124 3125 3126 3127 3128 |
return true; } void vm_stat_account(struct mm_struct *mm, vm_flags_t flags, long npages) { mm->total_vm += npages; |
d977d56ce mm: warn about Vm... |
3129 |
if (is_exec_mapping(flags)) |
846383359 mm: rework virtua... |
3130 |
mm->exec_vm += npages; |
d977d56ce mm: warn about Vm... |
3131 |
else if (is_stack_mapping(flags)) |
846383359 mm: rework virtua... |
3132 |
mm->stack_vm += npages; |
d977d56ce mm: warn about Vm... |
3133 |
else if (is_data_mapping(flags)) |
846383359 mm: rework virtua... |
3134 |
mm->data_vm += npages; |
119f657c7 [PATCH] RLIMIT_AS... |
3135 |
} |
fa5dc22f8 [PATCH] Add insta... |
3136 |
|
b3ec9f33a mm: change return... |
3137 |
static vm_fault_t special_mapping_fault(struct vm_fault *vmf); |
a62c34bd2 x86, mm: Improve ... |
3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 |
/* * Having a close hook prevents vma merging regardless of flags. */ static void special_mapping_close(struct vm_area_struct *vma) { } static const char *special_mapping_name(struct vm_area_struct *vma) { return ((struct vm_special_mapping *)vma->vm_private_data)->name; } |
b059a453b x86/vdso: Add mre... |
3150 3151 3152 |
static int special_mapping_mremap(struct vm_area_struct *new_vma) { struct vm_special_mapping *sm = new_vma->vm_private_data; |
280e87e98 ARM: 8683/1: ARM3... |
3153 3154 |
if (WARN_ON_ONCE(current->mm != new_vma->vm_mm)) return -EFAULT; |
b059a453b x86/vdso: Add mre... |
3155 3156 |
if (sm->mremap) return sm->mremap(sm, new_vma); |
280e87e98 ARM: 8683/1: ARM3... |
3157 |
|
b059a453b x86/vdso: Add mre... |
3158 3159 |
return 0; } |
a62c34bd2 x86, mm: Improve ... |
3160 3161 3162 |
static const struct vm_operations_struct special_mapping_vmops = { .close = special_mapping_close, .fault = special_mapping_fault, |
b059a453b x86/vdso: Add mre... |
3163 |
.mremap = special_mapping_mremap, |
a62c34bd2 x86, mm: Improve ... |
3164 3165 3166 3167 3168 3169 3170 |
.name = special_mapping_name, }; static const struct vm_operations_struct legacy_special_mapping_vmops = { .close = special_mapping_close, .fault = special_mapping_fault, }; |
fa5dc22f8 [PATCH] Add insta... |
3171 |
|
b3ec9f33a mm: change return... |
3172 |
static vm_fault_t special_mapping_fault(struct vm_fault *vmf) |
fa5dc22f8 [PATCH] Add insta... |
3173 |
{ |
11bac8000 mm, fs: reduce fa... |
3174 |
struct vm_area_struct *vma = vmf->vma; |
b1d0e4f53 mm: special mappi... |
3175 |
pgoff_t pgoff; |
fa5dc22f8 [PATCH] Add insta... |
3176 |
struct page **pages; |
f872f5400 mm: Add a vm_spec... |
3177 |
if (vma->vm_ops == &legacy_special_mapping_vmops) { |
a62c34bd2 x86, mm: Improve ... |
3178 |
pages = vma->vm_private_data; |
f872f5400 mm: Add a vm_spec... |
3179 3180 3181 3182 |
} else { struct vm_special_mapping *sm = vma->vm_private_data; if (sm->fault) |
11bac8000 mm, fs: reduce fa... |
3183 |
return sm->fault(sm, vmf->vma, vmf); |
f872f5400 mm: Add a vm_spec... |
3184 3185 3186 |
pages = sm->pages; } |
a62c34bd2 x86, mm: Improve ... |
3187 |
|
8a9cc3b55 mmap: fix the usa... |
3188 |
for (pgoff = vmf->pgoff; pgoff && *pages; ++pages) |
b1d0e4f53 mm: special mappi... |
3189 |
pgoff--; |
fa5dc22f8 [PATCH] Add insta... |
3190 3191 3192 3193 |
if (*pages) { struct page *page = *pages; get_page(page); |
b1d0e4f53 mm: special mappi... |
3194 3195 |
vmf->page = page; return 0; |
fa5dc22f8 [PATCH] Add insta... |
3196 |
} |
b1d0e4f53 mm: special mappi... |
3197 |
return VM_FAULT_SIGBUS; |
fa5dc22f8 [PATCH] Add insta... |
3198 |
} |
a62c34bd2 x86, mm: Improve ... |
3199 3200 3201 |
static struct vm_area_struct *__install_special_mapping( struct mm_struct *mm, unsigned long addr, unsigned long len, |
27f28b972 mm/mmap.c: change... |
3202 3203 |
unsigned long vm_flags, void *priv, const struct vm_operations_struct *ops) |
fa5dc22f8 [PATCH] Add insta... |
3204 |
{ |
462e635e5 install_special_m... |
3205 |
int ret; |
fa5dc22f8 [PATCH] Add insta... |
3206 |
struct vm_area_struct *vma; |
490fc0538 mm: make vm_area_... |
3207 |
vma = vm_area_alloc(mm); |
fa5dc22f8 [PATCH] Add insta... |
3208 |
if (unlikely(vma == NULL)) |
3935ed6a3 mm: Add new func ... |
3209 |
return ERR_PTR(-ENOMEM); |
fa5dc22f8 [PATCH] Add insta... |
3210 |
|
fa5dc22f8 [PATCH] Add insta... |
3211 3212 |
vma->vm_start = addr; vma->vm_end = addr + len; |
d9104d1ca mm: track vma cha... |
3213 |
vma->vm_flags = vm_flags | mm->def_flags | VM_DONTEXPAND | VM_SOFTDIRTY; |
3ed75eb8f setup vma->vm_pag... |
3214 |
vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); |
fa5dc22f8 [PATCH] Add insta... |
3215 |
|
a62c34bd2 x86, mm: Improve ... |
3216 3217 |
vma->vm_ops = ops; vma->vm_private_data = priv; |
fa5dc22f8 [PATCH] Add insta... |
3218 |
|
462e635e5 install_special_m... |
3219 3220 3221 |
ret = insert_vm_struct(mm, vma); if (ret) goto out; |
fa5dc22f8 [PATCH] Add insta... |
3222 |
|
846383359 mm: rework virtua... |
3223 |
vm_stat_account(mm, vma->vm_flags, len >> PAGE_SHIFT); |
fa5dc22f8 [PATCH] Add insta... |
3224 |
|
cdd6c482c perf: Do the big ... |
3225 |
perf_event_mmap(vma); |
089dd79db perf_counter: Gen... |
3226 |
|
3935ed6a3 mm: Add new func ... |
3227 |
return vma; |
462e635e5 install_special_m... |
3228 3229 |
out: |
3928d4f5e mm: use helper fu... |
3230 |
vm_area_free(vma); |
3935ed6a3 mm: Add new func ... |
3231 3232 |
return ERR_PTR(ret); } |
2eefd8789 x86/arch_prctl/vd... |
3233 3234 3235 3236 3237 3238 3239 |
bool vma_is_special_mapping(const struct vm_area_struct *vma, const struct vm_special_mapping *sm) { return vma->vm_private_data == sm && (vma->vm_ops == &special_mapping_vmops || vma->vm_ops == &legacy_special_mapping_vmops); } |
a62c34bd2 x86, mm: Improve ... |
3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 |
/* * Called with mm->mmap_sem held for writing. * Insert a new vma covering the given region, with the given flags. * Its pages are supplied by the given array of struct page *. * The array can be shorter than len >> PAGE_SHIFT if it's null-terminated. * The region past the last page supplied will always produce SIGBUS. * The array pointer and the pages it points to are assumed to stay alive * for as long as this mapping might exist. */ struct vm_area_struct *_install_special_mapping( struct mm_struct *mm, unsigned long addr, unsigned long len, unsigned long vm_flags, const struct vm_special_mapping *spec) { |
27f28b972 mm/mmap.c: change... |
3254 3255 |
return __install_special_mapping(mm, addr, len, vm_flags, (void *)spec, &special_mapping_vmops); |
a62c34bd2 x86, mm: Improve ... |
3256 |
} |
3935ed6a3 mm: Add new func ... |
3257 3258 3259 3260 |
int install_special_mapping(struct mm_struct *mm, unsigned long addr, unsigned long len, unsigned long vm_flags, struct page **pages) { |
a62c34bd2 x86, mm: Improve ... |
3261 |
struct vm_area_struct *vma = __install_special_mapping( |
27f28b972 mm/mmap.c: change... |
3262 3263 |
mm, addr, len, vm_flags, (void *)pages, &legacy_special_mapping_vmops); |
3935ed6a3 mm: Add new func ... |
3264 |
|
14bd5b458 mm/mmap.c: replac... |
3265 |
return PTR_ERR_OR_ZERO(vma); |
fa5dc22f8 [PATCH] Add insta... |
3266 |
} |
7906d00cd mmu-notifiers: ad... |
3267 3268 |
static DEFINE_MUTEX(mm_all_locks_mutex); |
454ed842d lockdep: annotate... |
3269 |
static void vm_lock_anon_vma(struct mm_struct *mm, struct anon_vma *anon_vma) |
7906d00cd mmu-notifiers: ad... |
3270 |
{ |
f808c13fd lib/interval_tree... |
3271 |
if (!test_bit(0, (unsigned long *) &anon_vma->root->rb_root.rb_root.rb_node)) { |
7906d00cd mmu-notifiers: ad... |
3272 3273 3274 3275 |
/* * The LSB of head.next can't change from under us * because we hold the mm_all_locks_mutex. */ |
572043c90 mm: mmap: annotat... |
3276 |
down_write_nest_lock(&anon_vma->root->rwsem, &mm->mmap_sem); |
7906d00cd mmu-notifiers: ad... |
3277 3278 |
/* * We can safely modify head.next after taking the |
5a505085f mm/rmap: Convert ... |
3279 |
* anon_vma->root->rwsem. If some other vma in this mm shares |
7906d00cd mmu-notifiers: ad... |
3280 3281 3282 3283 |
* the same anon_vma we won't take it again. * * No need of atomic instructions here, head.next * can't change from under us thanks to the |
5a505085f mm/rmap: Convert ... |
3284 |
* anon_vma->root->rwsem. |
7906d00cd mmu-notifiers: ad... |
3285 3286 |
*/ if (__test_and_set_bit(0, (unsigned long *) |
f808c13fd lib/interval_tree... |
3287 |
&anon_vma->root->rb_root.rb_root.rb_node)) |
7906d00cd mmu-notifiers: ad... |
3288 3289 3290 |
BUG(); } } |
454ed842d lockdep: annotate... |
3291 |
static void vm_lock_mapping(struct mm_struct *mm, struct address_space *mapping) |
7906d00cd mmu-notifiers: ad... |
3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 |
{ if (!test_bit(AS_MM_ALL_LOCKS, &mapping->flags)) { /* * AS_MM_ALL_LOCKS can't change from under us because * we hold the mm_all_locks_mutex. * * Operations on ->flags have to be atomic because * even if AS_MM_ALL_LOCKS is stable thanks to the * mm_all_locks_mutex, there may be other cpus * changing other bitflags in parallel to us. */ if (test_and_set_bit(AS_MM_ALL_LOCKS, &mapping->flags)) BUG(); |
c8c06efa8 mm: convert i_mma... |
3305 |
down_write_nest_lock(&mapping->i_mmap_rwsem, &mm->mmap_sem); |
7906d00cd mmu-notifiers: ad... |
3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 |
} } /* * This operation locks against the VM for all pte/vma/mm related * operations that could ever happen on a certain mm. This includes * vmtruncate, try_to_unmap, and all page faults. * * The caller must take the mmap_sem in write mode before calling * mm_take_all_locks(). The caller isn't allowed to release the * mmap_sem until mm_drop_all_locks() returns. * * mmap_sem in write mode is required in order to block all operations * that could modify pagetables and free pages without need of |
27ba0644e rmap: drop suppor... |
3320 |
* altering the vma layout. It's also needed in write mode to avoid new |
7906d00cd mmu-notifiers: ad... |
3321 3322 3323 3324 3325 |
* anon_vmas to be associated with existing vmas. * * A single task can't take more than one mm_take_all_locks() in a row * or it would deadlock. * |
bf181b9f9 mm anon rmap: rep... |
3326 |
* The LSB in anon_vma->rb_root.rb_node and the AS_MM_ALL_LOCKS bitflag in |
7906d00cd mmu-notifiers: ad... |
3327 3328 3329 |
* mapping->flags avoid to take the same lock twice, if more than one * vma in this mm is backed by the same anon_vma or address_space. * |
88f306b68 mm: fix locking o... |
3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 |
* We take locks in following order, accordingly to comment at beginning * of mm/rmap.c: * - all hugetlbfs_i_mmap_rwsem_key locks (aka mapping->i_mmap_rwsem for * hugetlb mapping); * - all i_mmap_rwsem locks; * - all anon_vma->rwseml * * We can take all locks within these types randomly because the VM code * doesn't nest them and we protected from parallel mm_take_all_locks() by * mm_all_locks_mutex. |
7906d00cd mmu-notifiers: ad... |
3340 3341 3342 3343 3344 3345 3346 3347 3348 |
* * mm_take_all_locks() and mm_drop_all_locks are expensive operations * that may have to take thousand of locks. * * mm_take_all_locks() can fail if it's interrupted by signals. */ int mm_take_all_locks(struct mm_struct *mm) { struct vm_area_struct *vma; |
5beb49305 mm: change anon_v... |
3349 |
struct anon_vma_chain *avc; |
7906d00cd mmu-notifiers: ad... |
3350 3351 3352 3353 3354 3355 3356 3357 |
BUG_ON(down_read_trylock(&mm->mmap_sem)); mutex_lock(&mm_all_locks_mutex); for (vma = mm->mmap; vma; vma = vma->vm_next) { if (signal_pending(current)) goto out_unlock; |
88f306b68 mm: fix locking o... |
3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 |
if (vma->vm_file && vma->vm_file->f_mapping && is_vm_hugetlb_page(vma)) vm_lock_mapping(mm, vma->vm_file->f_mapping); } for (vma = mm->mmap; vma; vma = vma->vm_next) { if (signal_pending(current)) goto out_unlock; if (vma->vm_file && vma->vm_file->f_mapping && !is_vm_hugetlb_page(vma)) |
454ed842d lockdep: annotate... |
3368 |
vm_lock_mapping(mm, vma->vm_file->f_mapping); |
7906d00cd mmu-notifiers: ad... |
3369 |
} |
7cd5a02f5 mm: fix mm_take_a... |
3370 3371 3372 3373 3374 |
for (vma = mm->mmap; vma; vma = vma->vm_next) { if (signal_pending(current)) goto out_unlock; if (vma->anon_vma) |
5beb49305 mm: change anon_v... |
3375 3376 |
list_for_each_entry(avc, &vma->anon_vma_chain, same_vma) vm_lock_anon_vma(mm, avc->anon_vma); |
7906d00cd mmu-notifiers: ad... |
3377 |
} |
7cd5a02f5 mm: fix mm_take_a... |
3378 |
|
584cff54e mm/mmap.c: elimin... |
3379 |
return 0; |
7906d00cd mmu-notifiers: ad... |
3380 3381 |
out_unlock: |
584cff54e mm/mmap.c: elimin... |
3382 3383 |
mm_drop_all_locks(mm); return -EINTR; |
7906d00cd mmu-notifiers: ad... |
3384 3385 3386 3387 |
} static void vm_unlock_anon_vma(struct anon_vma *anon_vma) { |
f808c13fd lib/interval_tree... |
3388 |
if (test_bit(0, (unsigned long *) &anon_vma->root->rb_root.rb_root.rb_node)) { |
7906d00cd mmu-notifiers: ad... |
3389 3390 3391 3392 3393 |
/* * The LSB of head.next can't change to 0 from under * us because we hold the mm_all_locks_mutex. * * We must however clear the bitflag before unlocking |
bf181b9f9 mm anon rmap: rep... |
3394 |
* the vma so the users using the anon_vma->rb_root will |
7906d00cd mmu-notifiers: ad... |
3395 3396 3397 3398 |
* never see our bitflag. * * No need of atomic instructions here, head.next * can't change from under us until we release the |
5a505085f mm/rmap: Convert ... |
3399 |
* anon_vma->root->rwsem. |
7906d00cd mmu-notifiers: ad... |
3400 3401 |
*/ if (!__test_and_clear_bit(0, (unsigned long *) |
f808c13fd lib/interval_tree... |
3402 |
&anon_vma->root->rb_root.rb_root.rb_node)) |
7906d00cd mmu-notifiers: ad... |
3403 |
BUG(); |
08b52706d mm/rmap: rename a... |
3404 |
anon_vma_unlock_write(anon_vma); |
7906d00cd mmu-notifiers: ad... |
3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 |
} } static void vm_unlock_mapping(struct address_space *mapping) { if (test_bit(AS_MM_ALL_LOCKS, &mapping->flags)) { /* * AS_MM_ALL_LOCKS can't change to 0 from under us * because we hold the mm_all_locks_mutex. */ |
83cde9e8b mm: use new helpe... |
3415 |
i_mmap_unlock_write(mapping); |
7906d00cd mmu-notifiers: ad... |
3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 |
if (!test_and_clear_bit(AS_MM_ALL_LOCKS, &mapping->flags)) BUG(); } } /* * The mmap_sem cannot be released by the caller until * mm_drop_all_locks() returns. */ void mm_drop_all_locks(struct mm_struct *mm) { struct vm_area_struct *vma; |
5beb49305 mm: change anon_v... |
3429 |
struct anon_vma_chain *avc; |
7906d00cd mmu-notifiers: ad... |
3430 3431 3432 3433 3434 3435 |
BUG_ON(down_read_trylock(&mm->mmap_sem)); BUG_ON(!mutex_is_locked(&mm_all_locks_mutex)); for (vma = mm->mmap; vma; vma = vma->vm_next) { if (vma->anon_vma) |
5beb49305 mm: change anon_v... |
3436 3437 |
list_for_each_entry(avc, &vma->anon_vma_chain, same_vma) vm_unlock_anon_vma(avc->anon_vma); |
7906d00cd mmu-notifiers: ad... |
3438 3439 3440 3441 3442 3443 |
if (vma->vm_file && vma->vm_file->f_mapping) vm_unlock_mapping(vma->vm_file->f_mapping); } mutex_unlock(&mm_all_locks_mutex); } |
8feae1311 NOMMU: Make VMAs ... |
3444 3445 |
/* |
3edf41d84 mm: fix comments ... |
3446 |
* initialise the percpu counter for VM |
8feae1311 NOMMU: Make VMAs ... |
3447 3448 3449 |
*/ void __init mmap_init(void) { |
00a62ce91 mm: fix Committed... |
3450 |
int ret; |
908c7f194 percpu_counter: a... |
3451 |
ret = percpu_counter_init(&vm_committed_as, 0, GFP_KERNEL); |
00a62ce91 mm: fix Committed... |
3452 |
VM_BUG_ON(ret); |
8feae1311 NOMMU: Make VMAs ... |
3453 |
} |
c9b1d0981 mm: limit growth ... |
3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 |
/* * Initialise sysctl_user_reserve_kbytes. * * This is intended to prevent a user from starting a single memory hogging * process, such that they cannot recover (kill the hog) in OVERCOMMIT_NEVER * mode. * * The default value is min(3% of free memory, 128MB) * 128MB is enough to recover with sshd/login, bash, and top/kill. */ |
1640879af mm: reinititalise... |
3465 |
static int init_user_reserve(void) |
c9b1d0981 mm: limit growth ... |
3466 3467 |
{ unsigned long free_kbytes; |
c41f012ad mm: rename global... |
3468 |
free_kbytes = global_zone_page_state(NR_FREE_PAGES) << (PAGE_SHIFT - 10); |
c9b1d0981 mm: limit growth ... |
3469 3470 3471 3472 |
sysctl_user_reserve_kbytes = min(free_kbytes / 32, 1UL << 17); return 0; } |
a64fb3cd6 mm: audit/fix non... |
3473 |
subsys_initcall(init_user_reserve); |
4eeab4f55 mm: replace hardc... |
3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 |
/* * Initialise sysctl_admin_reserve_kbytes. * * The purpose of sysctl_admin_reserve_kbytes is to allow the sys admin * to log in and kill a memory hogging process. * * Systems with more than 256MB will reserve 8MB, enough to recover * with sshd, bash, and top in OVERCOMMIT_GUESS. Smaller systems will * only reserve 3% of free pages by default. */ |
1640879af mm: reinititalise... |
3485 |
static int init_admin_reserve(void) |
4eeab4f55 mm: replace hardc... |
3486 3487 |
{ unsigned long free_kbytes; |
c41f012ad mm: rename global... |
3488 |
free_kbytes = global_zone_page_state(NR_FREE_PAGES) << (PAGE_SHIFT - 10); |
4eeab4f55 mm: replace hardc... |
3489 3490 3491 3492 |
sysctl_admin_reserve_kbytes = min(free_kbytes / 32, 1UL << 13); return 0; } |
a64fb3cd6 mm: audit/fix non... |
3493 |
subsys_initcall(init_admin_reserve); |
1640879af mm: reinititalise... |
3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 |
/* * Reinititalise user and admin reserves if memory is added or removed. * * The default user reserve max is 128MB, and the default max for the * admin reserve is 8MB. These are usually, but not always, enough to * enable recovery from a memory hogging process using login/sshd, a shell, * and tools like top. It may make sense to increase or even disable the * reserve depending on the existence of swap or variations in the recovery * tools. So, the admin may have changed them. * * If memory is added and the reserves have been eliminated or increased above * the default max, then we'll trust the admin. * * If memory is removed and there isn't enough free memory, then we * need to reset the reserves. * * Otherwise keep the reserve set by the admin. */ static int reserve_mem_notifier(struct notifier_block *nb, unsigned long action, void *data) { unsigned long tmp, free_kbytes; switch (action) { case MEM_ONLINE: /* Default max is 128MB. Leave alone if modified by operator. */ tmp = sysctl_user_reserve_kbytes; if (0 < tmp && tmp < (1UL << 17)) init_user_reserve(); /* Default max is 8MB. Leave alone if modified by operator. */ tmp = sysctl_admin_reserve_kbytes; if (0 < tmp && tmp < (1UL << 13)) init_admin_reserve(); break; case MEM_OFFLINE: |
c41f012ad mm: rename global... |
3532 |
free_kbytes = global_zone_page_state(NR_FREE_PAGES) << (PAGE_SHIFT - 10); |
1640879af mm: reinititalise... |
3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 |
if (sysctl_user_reserve_kbytes > free_kbytes) { init_user_reserve(); pr_info("vm.user_reserve_kbytes reset to %lu ", sysctl_user_reserve_kbytes); } if (sysctl_admin_reserve_kbytes > free_kbytes) { init_admin_reserve(); pr_info("vm.admin_reserve_kbytes reset to %lu ", sysctl_admin_reserve_kbytes); } break; default: break; } return NOTIFY_OK; } static struct notifier_block reserve_mem_nb = { .notifier_call = reserve_mem_notifier, }; static int __meminit init_reserve_notifier(void) { if (register_hotmemory_notifier(&reserve_mem_nb)) |
b1de0d139 mm: convert some ... |
3561 3562 |
pr_err("Failed registering memory add/remove notifier for admin reserve "); |
1640879af mm: reinititalise... |
3563 3564 3565 |
return 0; } |
a64fb3cd6 mm: audit/fix non... |
3566 |
subsys_initcall(init_reserve_notifier); |