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mm/mmap.c
69.4 KB
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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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*/ #include <linux/slab.h> |
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#include <linux/backing-dev.h> |
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#include <linux/mm.h> #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> #include <linux/profile.h> #include <linux/module.h> #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/perf_event.h> |
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#include <asm/uaccess.h> #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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#ifndef arch_rebalance_pgtables #define arch_rebalance_pgtables(addr, len) (addr) #endif |
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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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/* * WARNING: the debugging will use recursive algorithms so never enable this * unless you know what you are doing. */ #undef DEBUG_MM_RB /* 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 * * 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 * */ pgprot_t protection_map[16] = { __P000, __P001, __P010, __P011, __P100, __P101, __P110, __P111, __S000, __S001, __S010, __S011, __S100, __S101, __S110, __S111 }; |
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pgprot_t vm_get_page_prot(unsigned long vm_flags) { |
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return __pgprot(pgprot_val(protection_map[vm_flags & (VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)]) | pgprot_val(arch_vm_get_page_prot(vm_flags))); |
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} EXPORT_SYMBOL(vm_get_page_prot); |
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int sysctl_overcommit_memory = OVERCOMMIT_GUESS; /* heuristic overcommit */ int sysctl_overcommit_ratio = 50; /* default is 50% */ |
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int sysctl_max_map_count __read_mostly = DEFAULT_MAX_MAP_COUNT; |
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struct percpu_counter vm_committed_as; |
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/* * Check that a process has enough memory to allocate a new virtual * mapping. 0 means there is enough memory for the allocation to * succeed and -ENOMEM implies there is not. * * We currently support three overcommit policies, which are set via the * vm.overcommit_memory sysctl. See Documentation/vm/overcommit-accounting * * Strict overcommit modes added 2002 Feb 26 by Alan Cox. * Additional code 2002 Jul 20 by Robert Love. * * cap_sys_admin is 1 if the process has admin privileges, 0 otherwise. * * Note this is a helper function intended to be used by LSMs which * wish to use this logic. */ |
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int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin) |
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{ unsigned long free, allowed; vm_acct_memory(pages); /* * Sometimes we want to use more memory than we have */ if (sysctl_overcommit_memory == OVERCOMMIT_ALWAYS) return 0; if (sysctl_overcommit_memory == OVERCOMMIT_GUESS) { unsigned long n; |
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free = global_page_state(NR_FILE_PAGES); |
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free += nr_swap_pages; /* * Any slabs which are created with the * SLAB_RECLAIM_ACCOUNT flag claim to have contents * which are reclaimable, under pressure. The dentry * cache and most inode caches should fall into this */ |
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free += global_page_state(NR_SLAB_RECLAIMABLE); |
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/* * Leave the last 3% for root */ if (!cap_sys_admin) free -= free / 32; if (free > pages) return 0; /* * nr_free_pages() is very expensive on large systems, * only call if we're about to fail. */ n = nr_free_pages(); |
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/* * Leave reserved pages. The pages are not for anonymous pages. */ if (n <= totalreserve_pages) goto error; else n -= totalreserve_pages; /* * Leave the last 3% for root */ |
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if (!cap_sys_admin) n -= n / 32; free += n; if (free > pages) return 0; |
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goto error; |
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} allowed = (totalram_pages - hugetlb_total_pages()) * sysctl_overcommit_ratio / 100; /* * Leave the last 3% for root */ if (!cap_sys_admin) allowed -= allowed / 32; allowed += total_swap_pages; /* Don't let a single process grow too big: leave 3% of the size of this process for other processes */ |
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if (mm) allowed -= mm->total_vm / 32; |
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|
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if (percpu_counter_read_positive(&vm_committed_as) < allowed) |
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return 0; |
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error: |
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vm_unacct_memory(pages); return -ENOMEM; } |
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/* * Requires inode->i_mapping->i_mmap_lock */ static void __remove_shared_vm_struct(struct vm_area_struct *vma, struct file *file, struct address_space *mapping) { if (vma->vm_flags & VM_DENYWRITE) |
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atomic_inc(&file->f_path.dentry->d_inode->i_writecount); |
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if (vma->vm_flags & VM_SHARED) mapping->i_mmap_writable--; flush_dcache_mmap_lock(mapping); if (unlikely(vma->vm_flags & VM_NONLINEAR)) list_del_init(&vma->shared.vm_set.list); else vma_prio_tree_remove(vma, &mapping->i_mmap); flush_dcache_mmap_unlock(mapping); } /* |
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* Unlink a file-based vm structure from its prio_tree, to hide * 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; spin_lock(&mapping->i_mmap_lock); __remove_shared_vm_struct(vma, file, mapping); spin_unlock(&mapping->i_mmap_lock); } |
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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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if (vma->vm_flags & VM_EXECUTABLE) removed_exe_file_vma(vma->vm_mm); } |
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mpol_put(vma_policy(vma)); |
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kmem_cache_free(vm_area_cachep, vma); |
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return next; |
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} |
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SYSCALL_DEFINE1(brk, unsigned long, brk) |
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{ unsigned long rlim, retval; unsigned long newbrk, oldbrk; struct mm_struct *mm = current->mm; |
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unsigned long min_brk; |
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down_write(&mm->mmap_sem); |
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#ifdef CONFIG_COMPAT_BRK min_brk = mm->end_code; #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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rlim = rlimit(RLIMIT_DATA); |
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if (rlim < RLIM_INFINITY && (brk - mm->start_brk) + (mm->end_data - mm->start_data) > rlim) |
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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) { if (!do_munmap(mm, newbrk, oldbrk-newbrk)) goto set_brk; goto out; } |
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/* Check against existing mmap mappings. */ if (find_vma_intersection(mm, oldbrk, newbrk+PAGE_SIZE)) goto out; /* Ok, looks good - let it rip. */ if (do_brk(oldbrk, newbrk-oldbrk) != oldbrk) goto out; set_brk: mm->brk = brk; out: retval = mm->brk; up_write(&mm->mmap_sem); return retval; } #ifdef DEBUG_MM_RB static int browse_rb(struct rb_root *root) { int i = 0, j; 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); if (vma->vm_start < prev) printk("vm_start %lx prev %lx ", vma->vm_start, prev), i = -1; if (vma->vm_start < pend) printk("vm_start %lx pend %lx ", vma->vm_start, pend); if (vma->vm_start > vma->vm_end) printk("vm_end %lx < vm_start %lx ", vma->vm_end, vma->vm_start); i++; pn = nd; |
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prev = vma->vm_start; pend = vma->vm_end; |
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} j = 0; for (nd = pn; nd; nd = rb_prev(nd)) { j++; } if (i != j) printk("backwards %d, forwards %d ", j, i), i = 0; return i; } void validate_mm(struct mm_struct *mm) { int bug = 0; int i = 0; struct vm_area_struct *tmp = mm->mmap; while (tmp) { tmp = tmp->vm_next; i++; } if (i != mm->map_count) printk("map_count %d vm_next %d ", mm->map_count, i), bug = 1; i = browse_rb(&mm->mm_rb); if (i != mm->map_count) printk("map_count %d rb %d ", mm->map_count, i), bug = 1; |
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BUG_ON(bug); |
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} #else #define validate_mm(mm) do { } while (0) #endif static struct vm_area_struct * find_vma_prepare(struct mm_struct *mm, unsigned long addr, struct vm_area_struct **pprev, struct rb_node ***rb_link, struct rb_node ** rb_parent) { struct vm_area_struct * vma; struct rb_node ** __rb_link, * __rb_parent, * rb_prev; __rb_link = &mm->mm_rb.rb_node; rb_prev = __rb_parent = NULL; vma = NULL; 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) { vma = vma_tmp; if (vma_tmp->vm_start <= addr) |
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break; |
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__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; return vma; } static inline void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma, struct vm_area_struct *prev, struct rb_node *rb_parent) { |
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struct vm_area_struct *next; vma->vm_prev = prev; |
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if (prev) { |
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next = prev->vm_next; |
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prev->vm_next = vma; } else { mm->mmap = vma; if (rb_parent) |
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next = rb_entry(rb_parent, |
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struct vm_area_struct, vm_rb); else |
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next = NULL; |
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} |
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vma->vm_next = next; if (next) next->vm_prev = vma; |
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} void __vma_link_rb(struct mm_struct *mm, struct vm_area_struct *vma, struct rb_node **rb_link, struct rb_node *rb_parent) { rb_link_node(&vma->vm_rb, rb_parent, rb_link); rb_insert_color(&vma->vm_rb, &mm->mm_rb); } |
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static void __vma_link_file(struct vm_area_struct *vma) |
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{ |
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struct file *file; |
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file = vma->vm_file; if (file) { struct address_space *mapping = file->f_mapping; if (vma->vm_flags & VM_DENYWRITE) |
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atomic_dec(&file->f_path.dentry->d_inode->i_writecount); |
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if (vma->vm_flags & VM_SHARED) mapping->i_mmap_writable++; flush_dcache_mmap_lock(mapping); if (unlikely(vma->vm_flags & VM_NONLINEAR)) vma_nonlinear_insert(vma, &mapping->i_mmap_nonlinear); else vma_prio_tree_insert(vma, &mapping->i_mmap); 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); |
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} 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; if (vma->vm_file) mapping = vma->vm_file->f_mapping; if (mapping) { spin_lock(&mapping->i_mmap_lock); vma->vm_truncate_count = mapping->truncate_count; } |
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__vma_link(mm, vma, prev, rb_link, rb_parent); __vma_link_file(vma); |
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if (mapping) spin_unlock(&mapping->i_mmap_lock); mm->map_count++; validate_mm(mm); } /* * Helper for vma_adjust in the split_vma insert case: * insert vm structure into list and rbtree and anon_vma, * but it has already been inserted into prio_tree earlier. */ |
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static void __insert_vm_struct(struct mm_struct *mm, struct vm_area_struct *vma) |
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{ |
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struct vm_area_struct *__vma, *prev; struct rb_node **rb_link, *rb_parent; |
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__vma = find_vma_prepare(mm, vma->vm_start,&prev, &rb_link, &rb_parent); |
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BUG_ON(__vma && __vma->vm_start < vma->vm_end); |
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__vma_link(mm, vma, prev, rb_link, rb_parent); mm->map_count++; } static inline void __vma_unlink(struct mm_struct *mm, struct vm_area_struct *vma, struct vm_area_struct *prev) { |
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struct vm_area_struct *next = vma->vm_next; prev->vm_next = next; if (next) next->vm_prev = prev; |
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rb_erase(&vma->vm_rb, &mm->mm_rb); if (mm->mmap_cache == vma) mm->mmap_cache = prev; } /* * 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. */ |
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int vma_adjust(struct vm_area_struct *vma, unsigned long start, |
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unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert) { struct mm_struct *mm = vma->vm_mm; struct vm_area_struct *next = vma->vm_next; struct vm_area_struct *importer = NULL; struct address_space *mapping = NULL; struct prio_tree_root *root = NULL; |
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struct anon_vma *anon_vma = NULL; |
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struct file *file = vma->vm_file; |
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long adjust_next = 0; int remove_next = 0; if (next && !insert) { |
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struct vm_area_struct *exporter = NULL; |
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if (end >= next->vm_end) { /* * vma expands, overlapping all the next, and * perhaps the one after too (mprotect case 6). */ again: remove_next = 1 + (end > next->vm_end); end = next->vm_end; |
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exporter = next; |
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importer = vma; } 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; |
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exporter = next; |
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importer = vma; } 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. */ adjust_next = - ((vma->vm_end - end) >> PAGE_SHIFT); |
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exporter = vma; |
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importer = next; } |
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|
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/* * 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. */ |
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if (exporter && exporter->anon_vma && !importer->anon_vma) { if (anon_vma_clone(importer, exporter)) |
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549 |
return -ENOMEM; |
287d97ac0 vma_adjust: fix t... |
550 |
importer->anon_vma = exporter->anon_vma; |
5beb49305 mm: change anon_v... |
551 552 |
} } |
1da177e4c Linux-2.6.12-rc2 |
553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 |
if (file) { mapping = file->f_mapping; if (!(vma->vm_flags & VM_NONLINEAR)) root = &mapping->i_mmap; spin_lock(&mapping->i_mmap_lock); if (importer && vma->vm_truncate_count != next->vm_truncate_count) { /* * unmap_mapping_range might be in progress: * ensure that the expanding vma is rescanned. */ importer->vm_truncate_count = 0; } if (insert) { insert->vm_truncate_count = vma->vm_truncate_count; /* * Put into prio_tree now, so instantiated pages * 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); } } |
012f18004 mm: always lock t... |
577 578 579 580 581 582 583 584 585 586 |
/* * When changing only vma->vm_end, we don't really need anon_vma * lock. This is a fairly rare case by itself, but the anon_vma * lock may be shared between many sibling processes. Skipping * the lock for brk adjustments makes a difference sometimes. */ if (vma->anon_vma && (insert || importer || start != vma->vm_start)) { anon_vma = vma->anon_vma; anon_vma_lock(anon_vma); } |
1da177e4c Linux-2.6.12-rc2 |
587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 |
if (root) { flush_dcache_mmap_lock(mapping); vma_prio_tree_remove(vma, root); if (adjust_next) vma_prio_tree_remove(next, root); } vma->vm_start = start; vma->vm_end = end; vma->vm_pgoff = pgoff; if (adjust_next) { next->vm_start += adjust_next << PAGE_SHIFT; next->vm_pgoff += adjust_next; } if (root) { if (adjust_next) vma_prio_tree_insert(next, root); vma_prio_tree_insert(vma, root); 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. */ __vma_unlink(mm, next, vma); if (file) __remove_shared_vm_struct(next, file, mapping); |
1da177e4c Linux-2.6.12-rc2 |
617 618 619 620 621 622 623 624 |
} 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); } |
012f18004 mm: always lock t... |
625 626 |
if (anon_vma) anon_vma_unlock(anon_vma); |
1da177e4c Linux-2.6.12-rc2 |
627 628 629 630 |
if (mapping) spin_unlock(&mapping->i_mmap_lock); if (remove_next) { |
925d1c401 procfs task exe s... |
631 |
if (file) { |
1da177e4c Linux-2.6.12-rc2 |
632 |
fput(file); |
925d1c401 procfs task exe s... |
633 634 635 |
if (next->vm_flags & VM_EXECUTABLE) removed_exe_file_vma(mm); } |
5beb49305 mm: change anon_v... |
636 637 |
if (next->anon_vma) anon_vma_merge(vma, next); |
1da177e4c Linux-2.6.12-rc2 |
638 |
mm->map_count--; |
f0be3d32b mempolicy: rename... |
639 |
mpol_put(vma_policy(next)); |
1da177e4c Linux-2.6.12-rc2 |
640 641 642 643 644 645 646 647 648 649 650 651 652 |
kmem_cache_free(vm_area_cachep, next); /* * 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. */ if (remove_next == 2) { next = vma->vm_next; goto again; } } validate_mm(mm); |
5beb49305 mm: change anon_v... |
653 654 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
655 656 657 658 659 660 |
} /* * 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 |
661 662 663 |
static inline int is_mergeable_vma(struct vm_area_struct *vma, struct file *file, unsigned long vm_flags) { |
8314c4f24 ksm: remove VM_ME... |
664 665 |
/* VM_CAN_NONLINEAR may get set later by f_op->mmap() */ if ((vma->vm_flags ^ vm_flags) & ~VM_CAN_NONLINEAR) |
1da177e4c Linux-2.6.12-rc2 |
666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 |
return 0; if (vma->vm_file != file) return 0; if (vma->vm_ops && vma->vm_ops->close) return 0; return 1; } static inline int is_mergeable_anon_vma(struct anon_vma *anon_vma1, struct anon_vma *anon_vma2) { return !anon_vma1 || !anon_vma2 || (anon_vma1 == anon_vma2); } /* * 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, struct anon_vma *anon_vma, struct file *file, pgoff_t vm_pgoff) { if (is_mergeable_vma(vma, file, vm_flags) && is_mergeable_anon_vma(anon_vma, vma->anon_vma)) { 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, struct anon_vma *anon_vma, struct file *file, pgoff_t vm_pgoff) { if (is_mergeable_vma(vma, file, vm_flags) && is_mergeable_anon_vma(anon_vma, vma->anon_vma)) { pgoff_t vm_pglen; vm_pglen = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; 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 * mremap move: PPPPNNNNNNNN 8 * AAAA * PPPP NNNN PPPPPPPPPPPP PPPPPPPPNNNN PPPPNNNNNNNN * might become case 1 below case 2 below case 3 below * * Odd one out? Case 8, because it extends NNNN but needs flags of XXXX: * mprotect_fixup updates vm_flags & vm_page_prot on successful return. */ 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, struct anon_vma *anon_vma, struct file *file, pgoff_t pgoff, struct mempolicy *policy) { pgoff_t pglen = (end - addr) >> PAGE_SHIFT; struct vm_area_struct *area, *next; |
5beb49305 mm: change anon_v... |
761 |
int err; |
1da177e4c Linux-2.6.12-rc2 |
762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 |
/* * 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; if (next && next->vm_end == end) /* cases 6, 7, 8 */ next = next->vm_next; /* * Can it merge with the predecessor? */ if (prev && prev->vm_end == addr && mpol_equal(vma_policy(prev), policy) && can_vma_merge_after(prev, vm_flags, anon_vma, file, pgoff)) { /* * 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, anon_vma, file, pgoff+pglen) && is_mergeable_anon_vma(prev->anon_vma, next->anon_vma)) { /* cases 1, 6 */ |
5beb49305 mm: change anon_v... |
795 |
err = vma_adjust(prev, prev->vm_start, |
1da177e4c Linux-2.6.12-rc2 |
796 797 |
next->vm_end, prev->vm_pgoff, NULL); } else /* cases 2, 5, 7 */ |
5beb49305 mm: change anon_v... |
798 |
err = vma_adjust(prev, prev->vm_start, |
1da177e4c Linux-2.6.12-rc2 |
799 |
end, prev->vm_pgoff, NULL); |
5beb49305 mm: change anon_v... |
800 801 |
if (err) return NULL; |
1da177e4c Linux-2.6.12-rc2 |
802 803 804 805 806 807 808 809 810 811 812 |
return prev; } /* * Can this new request be merged in front of next? */ if (next && end == next->vm_start && mpol_equal(policy, vma_policy(next)) && can_vma_merge_before(next, vm_flags, anon_vma, file, pgoff+pglen)) { if (prev && addr < prev->vm_end) /* case 4 */ |
5beb49305 mm: change anon_v... |
813 |
err = vma_adjust(prev, prev->vm_start, |
1da177e4c Linux-2.6.12-rc2 |
814 815 |
addr, prev->vm_pgoff, NULL); else /* cases 3, 8 */ |
5beb49305 mm: change anon_v... |
816 |
err = vma_adjust(area, addr, next->vm_end, |
1da177e4c Linux-2.6.12-rc2 |
817 |
next->vm_pgoff - pglen, NULL); |
5beb49305 mm: change anon_v... |
818 819 |
if (err) return NULL; |
1da177e4c Linux-2.6.12-rc2 |
820 821 822 823 824 825 826 |
return area; } return NULL; } /* |
d0e9fe175 Simplify and comm... |
827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 |
* 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 && !((a->vm_flags ^ b->vm_flags) & ~(VM_READ|VM_WRITE|VM_EXEC)) && 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 * we do that ACCESS_ONCE() to make sure that we never re-load the pointer. * * 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)) { struct anon_vma *anon_vma = ACCESS_ONCE(old->anon_vma); if (anon_vma && list_is_singular(&old->anon_vma_chain)) return anon_vma; } return NULL; } /* |
1da177e4c Linux-2.6.12-rc2 |
882 883 884 885 886 887 888 889 890 |
* 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... |
891 |
struct anon_vma *anon_vma; |
1da177e4c Linux-2.6.12-rc2 |
892 |
struct vm_area_struct *near; |
1da177e4c Linux-2.6.12-rc2 |
893 894 895 896 |
near = vma->vm_next; if (!near) goto try_prev; |
d0e9fe175 Simplify and comm... |
897 898 899 |
anon_vma = reusable_anon_vma(near, vma, near); if (anon_vma) return anon_vma; |
1da177e4c Linux-2.6.12-rc2 |
900 901 902 903 904 905 906 907 |
try_prev: /* * It is potentially slow to have to call find_vma_prev here. * But it's only on the first write fault on the vma, not * every time, and we could devise a way to avoid it later * (e.g. stash info in next's anon_vma_node when assigning * an anon_vma, or when trying vma_merge). Another time. */ |
46a350ef9 BUG_ON() Conversi... |
908 |
BUG_ON(find_vma_prev(vma->vm_mm, vma->vm_start, &near) != vma); |
1da177e4c Linux-2.6.12-rc2 |
909 910 |
if (!near) goto none; |
d0e9fe175 Simplify and comm... |
911 912 913 |
anon_vma = reusable_anon_vma(near, near, vma); if (anon_vma) return anon_vma; |
1da177e4c Linux-2.6.12-rc2 |
914 915 916 917 918 919 920 921 922 923 924 925 926 |
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; } #ifdef CONFIG_PROC_FS |
ab50b8ed8 [PATCH] mm: vm_st... |
927 |
void vm_stat_account(struct mm_struct *mm, unsigned long flags, |
1da177e4c Linux-2.6.12-rc2 |
928 929 930 931 |
struct file *file, long pages) { const unsigned long stack_flags = VM_STACK_FLAGS & (VM_GROWSUP|VM_GROWSDOWN); |
1da177e4c Linux-2.6.12-rc2 |
932 933 934 935 936 937 938 939 940 941 942 943 |
if (file) { mm->shared_vm += pages; if ((flags & (VM_EXEC|VM_WRITE)) == VM_EXEC) mm->exec_vm += pages; } else if (flags & stack_flags) mm->stack_vm += pages; if (flags & (VM_RESERVED|VM_IO)) mm->reserved_vm += pages; } #endif /* CONFIG_PROC_FS */ /* |
27f5de796 mm: Fix problem o... |
944 |
* The caller must hold down_write(¤t->mm->mmap_sem). |
1da177e4c Linux-2.6.12-rc2 |
945 |
*/ |
48aae4255 mm/mmap.c: fix co... |
946 |
unsigned long do_mmap_pgoff(struct file *file, unsigned long addr, |
1da177e4c Linux-2.6.12-rc2 |
947 948 949 950 |
unsigned long len, unsigned long prot, unsigned long flags, unsigned long pgoff) { struct mm_struct * mm = current->mm; |
1da177e4c Linux-2.6.12-rc2 |
951 952 |
struct inode *inode; unsigned int vm_flags; |
1da177e4c Linux-2.6.12-rc2 |
953 |
int error; |
0165ab443 split mmap |
954 |
unsigned long reqprot = prot; |
1da177e4c Linux-2.6.12-rc2 |
955 |
|
1da177e4c Linux-2.6.12-rc2 |
956 957 958 959 960 961 962 |
/* * 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)) |
d3ac7f892 [PATCH] mm: chang... |
963 |
if (!(file && (file->f_path.mnt->mnt_flags & MNT_NOEXEC))) |
1da177e4c Linux-2.6.12-rc2 |
964 965 966 967 |
prot |= PROT_EXEC; if (!len) return -EINVAL; |
7cd94146c Security: round m... |
968 969 |
if (!(flags & MAP_FIXED)) addr = round_hint_to_min(addr); |
1da177e4c Linux-2.6.12-rc2 |
970 971 |
/* Careful about overflows.. */ len = PAGE_ALIGN(len); |
9206de95b Take arch_mmap_ch... |
972 |
if (!len) |
1da177e4c Linux-2.6.12-rc2 |
973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 |
return -ENOMEM; /* offset overflow? */ if ((pgoff + (len >> PAGE_SHIFT)) < pgoff) return -EOVERFLOW; /* 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); if (addr & ~PAGE_MASK) return addr; /* 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. */ vm_flags = calc_vm_prot_bits(prot) | calc_vm_flag_bits(flags) | mm->def_flags | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC; |
cdf7b3418 mmap: remove unne... |
996 |
if (flags & MAP_LOCKED) |
1da177e4c Linux-2.6.12-rc2 |
997 998 |
if (!can_do_mlock()) return -EPERM; |
ba470de43 mmap: handle mloc... |
999 |
|
1da177e4c Linux-2.6.12-rc2 |
1000 1001 1002 |
/* mlock MCL_FUTURE? */ if (vm_flags & VM_LOCKED) { unsigned long locked, lock_limit; |
93ea1d0a1 [PATCH] RLIMIT_ME... |
1003 1004 |
locked = len >> PAGE_SHIFT; locked += mm->locked_vm; |
59e99e5b9 mm: use rlimit he... |
1005 |
lock_limit = rlimit(RLIMIT_MEMLOCK); |
93ea1d0a1 [PATCH] RLIMIT_ME... |
1006 |
lock_limit >>= PAGE_SHIFT; |
1da177e4c Linux-2.6.12-rc2 |
1007 1008 1009 |
if (locked > lock_limit && !capable(CAP_IPC_LOCK)) return -EAGAIN; } |
d3ac7f892 [PATCH] mm: chang... |
1010 |
inode = file ? file->f_path.dentry->d_inode : NULL; |
1da177e4c Linux-2.6.12-rc2 |
1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 |
if (file) { switch (flags & MAP_TYPE) { case MAP_SHARED: 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. */ if (locks_verify_locked(inode)) 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; |
d3ac7f892 [PATCH] mm: chang... |
1039 |
if (file->f_path.mnt->mnt_flags & MNT_NOEXEC) { |
80c5606c3 Fix VM_MAYEXEC ca... |
1040 1041 1042 1043 |
if (vm_flags & VM_EXEC) return -EPERM; vm_flags &= ~VM_MAYEXEC; } |
80c5606c3 Fix VM_MAYEXEC ca... |
1044 1045 1046 |
if (!file->f_op || !file->f_op->mmap) return -ENODEV; |
1da177e4c Linux-2.6.12-rc2 |
1047 1048 1049 1050 1051 1052 1053 1054 |
break; default: return -EINVAL; } } else { switch (flags & MAP_TYPE) { case MAP_SHARED: |
ce3639426 mmap: fix petty b... |
1055 1056 1057 1058 |
/* * Ignore pgoff. */ pgoff = 0; |
1da177e4c Linux-2.6.12-rc2 |
1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 |
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; } } |
ed0321895 security: Protect... |
1071 |
error = security_file_mmap(file, reqprot, prot, flags, addr, 0); |
1da177e4c Linux-2.6.12-rc2 |
1072 1073 |
if (error) return error; |
ed0321895 security: Protect... |
1074 |
|
5a6fe1259 Do not account fo... |
1075 |
return mmap_region(file, addr, len, flags, vm_flags, pgoff); |
0165ab443 split mmap |
1076 1077 |
} EXPORT_SYMBOL(do_mmap_pgoff); |
66f0dc481 mm: move sys_mmap... |
1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 |
SYSCALL_DEFINE6(mmap_pgoff, unsigned long, addr, unsigned long, len, unsigned long, prot, unsigned long, flags, unsigned long, fd, unsigned long, pgoff) { struct file *file = NULL; unsigned long retval = -EBADF; if (!(flags & MAP_ANONYMOUS)) { if (unlikely(flags & MAP_HUGETLB)) return -EINVAL; file = fget(fd); if (!file) goto out; } else if (flags & MAP_HUGETLB) { struct user_struct *user = NULL; /* * 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 */ len = ALIGN(len, huge_page_size(&default_hstate)); file = hugetlb_file_setup(HUGETLB_ANON_FILE, len, VM_NORESERVE, &user, HUGETLB_ANONHUGE_INODE); if (IS_ERR(file)) return PTR_ERR(file); } flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); down_write(¤t->mm->mmap_sem); retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); up_write(¤t->mm->mmap_sem); if (file) fput(file); out: return retval; } |
a4679373c Add generic sys_o... |
1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 |
#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; if (a.offset & ~PAGE_MASK) return -EINVAL; return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT); } #endif /* __ARCH_WANT_SYS_OLD_MMAP */ |
4e950f6f0 Remove fs.h from ... |
1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 |
/* * 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). */ int vma_wants_writenotify(struct vm_area_struct *vma) { unsigned int vm_flags = vma->vm_flags; /* 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? */ if (vma->vm_ops && vma->vm_ops->page_mkwrite) return 1; /* The open routine did something to the protections already? */ if (pgprot_val(vma->vm_page_prot) != |
3ed75eb8f setup vma->vm_pag... |
1160 |
pgprot_val(vm_get_page_prot(vm_flags))) |
4e950f6f0 Remove fs.h from ... |
1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 |
return 0; /* Specialty mapping? */ if (vm_flags & (VM_PFNMAP|VM_INSERTPAGE)) 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... |
1171 1172 |
/* * We account for memory if it's a private writeable mapping, |
5a6fe1259 Do not account fo... |
1173 |
* not hugepages and VM_NORESERVE wasn't set. |
fc8744adc Stop playing sill... |
1174 |
*/ |
5a6fe1259 Do not account fo... |
1175 |
static inline int accountable_mapping(struct file *file, unsigned int vm_flags) |
fc8744adc Stop playing sill... |
1176 |
{ |
5a6fe1259 Do not account fo... |
1177 1178 1179 1180 1181 1182 |
/* * 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... |
1183 1184 |
return (vm_flags & (VM_NORESERVE | VM_SHARED | VM_WRITE)) == VM_WRITE; } |
0165ab443 split mmap |
1185 1186 |
unsigned long mmap_region(struct file *file, unsigned long addr, unsigned long len, unsigned long flags, |
5a6fe1259 Do not account fo... |
1187 |
unsigned int vm_flags, unsigned long pgoff) |
0165ab443 split mmap |
1188 1189 1190 1191 1192 1193 1194 1195 |
{ struct mm_struct *mm = current->mm; struct vm_area_struct *vma, *prev; int correct_wcount = 0; int error; struct rb_node **rb_link, *rb_parent; unsigned long charged = 0; struct inode *inode = file ? file->f_path.dentry->d_inode : NULL; |
1da177e4c Linux-2.6.12-rc2 |
1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 |
/* Clear old maps */ error = -ENOMEM; munmap_back: vma = find_vma_prepare(mm, addr, &prev, &rb_link, &rb_parent); if (vma && vma->vm_start < addr + len) { if (do_munmap(mm, addr, len)) return -ENOMEM; goto munmap_back; } /* Check against address space limit. */ |
119f657c7 [PATCH] RLIMIT_AS... |
1207 |
if (!may_expand_vm(mm, len >> PAGE_SHIFT)) |
1da177e4c Linux-2.6.12-rc2 |
1208 |
return -ENOMEM; |
fc8744adc Stop playing sill... |
1209 1210 |
/* * Set 'VM_NORESERVE' if we should not account for the |
5a6fe1259 Do not account fo... |
1211 |
* memory use of this mapping. |
fc8744adc Stop playing sill... |
1212 |
*/ |
5a6fe1259 Do not account fo... |
1213 1214 1215 1216 1217 1218 1219 1220 1221 |
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; } |
cdfd4325c mm: record MAP_NO... |
1222 |
|
fc8744adc Stop playing sill... |
1223 1224 1225 |
/* * Private writable mapping: check memory availability */ |
5a6fe1259 Do not account fo... |
1226 |
if (accountable_mapping(file, vm_flags)) { |
fc8744adc Stop playing sill... |
1227 1228 1229 1230 |
charged = len >> PAGE_SHIFT; if (security_vm_enough_memory(charged)) return -ENOMEM; vm_flags |= VM_ACCOUNT; |
1da177e4c Linux-2.6.12-rc2 |
1231 1232 1233 |
} /* |
de33c8db5 Fix OOPS in mmap_... |
1234 |
* Can we just expand an old mapping? |
1da177e4c Linux-2.6.12-rc2 |
1235 |
*/ |
de33c8db5 Fix OOPS in mmap_... |
1236 1237 1238 |
vma = vma_merge(mm, prev, addr, addr + len, vm_flags, NULL, file, pgoff, NULL); if (vma) goto out; |
1da177e4c Linux-2.6.12-rc2 |
1239 1240 1241 1242 1243 1244 |
/* * 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. */ |
c5e3b83e9 [PATCH] mm: use k... |
1245 |
vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
1246 1247 1248 1249 |
if (!vma) { error = -ENOMEM; goto unacct_error; } |
1da177e4c Linux-2.6.12-rc2 |
1250 1251 1252 1253 1254 |
vma->vm_mm = mm; vma->vm_start = addr; vma->vm_end = addr + len; vma->vm_flags = vm_flags; |
3ed75eb8f setup vma->vm_pag... |
1255 |
vma->vm_page_prot = vm_get_page_prot(vm_flags); |
1da177e4c Linux-2.6.12-rc2 |
1256 |
vma->vm_pgoff = pgoff; |
5beb49305 mm: change anon_v... |
1257 |
INIT_LIST_HEAD(&vma->anon_vma_chain); |
1da177e4c Linux-2.6.12-rc2 |
1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 |
if (file) { error = -EINVAL; if (vm_flags & (VM_GROWSDOWN|VM_GROWSUP)) goto free_vma; if (vm_flags & VM_DENYWRITE) { error = deny_write_access(file); if (error) goto free_vma; correct_wcount = 1; } vma->vm_file = file; get_file(file); error = file->f_op->mmap(file, vma); if (error) goto unmap_and_free_vma; |
925d1c401 procfs task exe s... |
1274 1275 |
if (vm_flags & VM_EXECUTABLE) added_exe_file_vma(mm); |
f8dbf0a7a mmap: save some c... |
1276 1277 1278 1279 1280 1281 1282 1283 1284 |
/* Can addr have changed?? * * Answer: Yes, several device drivers can do it in their * f_op->mmap method. -DaveM */ addr = vma->vm_start; pgoff = vma->vm_pgoff; vm_flags = vma->vm_flags; |
1da177e4c Linux-2.6.12-rc2 |
1285 1286 1287 1288 1289 |
} else if (vm_flags & VM_SHARED) { error = shmem_zero_setup(vma); if (error) goto free_vma; } |
c9d0bf241 mm: uncached vma ... |
1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 |
if (vma_wants_writenotify(vma)) { pgprot_t pprot = vma->vm_page_prot; /* Can vma->vm_page_prot have changed?? * * Answer: Yes, drivers may have changed it in their * f_op->mmap method. * * Ensures that vmas marked as uncached stay that way. */ |
1ddd439ef fix mprotect vma_... |
1300 |
vma->vm_page_prot = vm_get_page_prot(vm_flags & ~VM_SHARED); |
c9d0bf241 mm: uncached vma ... |
1301 1302 1303 |
if (pgprot_val(pprot) == pgprot_val(pgprot_noncached(pprot))) vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); } |
d08b3851d [PATCH] mm: track... |
1304 |
|
de33c8db5 Fix OOPS in mmap_... |
1305 1306 |
vma_link(mm, vma, prev, rb_link, rb_parent); file = vma->vm_file; |
4d3d5b41a mmap_region: clea... |
1307 1308 1309 1310 1311 |
/* Once vma denies write, undo our temporary denial count */ if (correct_wcount) atomic_inc(&inode->i_writecount); out: |
cdd6c482c perf: Do the big ... |
1312 |
perf_event_mmap(vma); |
0a4a93919 perf_counter: exe... |
1313 |
|
1da177e4c Linux-2.6.12-rc2 |
1314 |
mm->total_vm += len >> PAGE_SHIFT; |
ab50b8ed8 [PATCH] mm: vm_st... |
1315 |
vm_stat_account(mm, vm_flags, file, len >> PAGE_SHIFT); |
1da177e4c Linux-2.6.12-rc2 |
1316 |
if (vm_flags & VM_LOCKED) { |
06f9d8c2b mm: mlock_vma_pag... |
1317 1318 |
if (!mlock_vma_pages_range(vma, addr, addr + len)) mm->locked_vm += (len >> PAGE_SHIFT); |
ba470de43 mmap: handle mloc... |
1319 |
} else if ((flags & MAP_POPULATE) && !(flags & MAP_NONBLOCK)) |
54cb8821d mm: merge populat... |
1320 |
make_pages_present(addr, addr + len); |
1da177e4c Linux-2.6.12-rc2 |
1321 1322 1323 1324 1325 1326 1327 1328 1329 |
return addr; unmap_and_free_vma: if (correct_wcount) atomic_inc(&inode->i_writecount); vma->vm_file = NULL; fput(file); /* Undo any partial mapping done by a device driver. */ |
e0da382c9 [PATCH] freepgt: ... |
1330 1331 |
unmap_region(mm, vma, prev, vma->vm_start, vma->vm_end); charged = 0; |
1da177e4c Linux-2.6.12-rc2 |
1332 1333 1334 1335 1336 1337 1338 |
free_vma: kmem_cache_free(vm_area_cachep, vma); unacct_error: if (charged) vm_unacct_memory(charged); return error; } |
1da177e4c Linux-2.6.12-rc2 |
1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 |
/* 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; struct vm_area_struct *vma; unsigned long start_addr; if (len > TASK_SIZE) return -ENOMEM; |
06abdfb47 get_unmapped_area... |
1361 1362 |
if (flags & MAP_FIXED) return addr; |
1da177e4c Linux-2.6.12-rc2 |
1363 1364 1365 1366 1367 1368 1369 |
if (addr) { addr = PAGE_ALIGN(addr); vma = find_vma(mm, addr); if (TASK_SIZE - len >= addr && (!vma || addr + len <= vma->vm_start)) return addr; } |
1363c3cd8 [PATCH] Avoiding ... |
1370 1371 1372 1373 1374 1375 |
if (len > mm->cached_hole_size) { start_addr = addr = mm->free_area_cache; } else { start_addr = addr = TASK_UNMAPPED_BASE; mm->cached_hole_size = 0; } |
1da177e4c Linux-2.6.12-rc2 |
1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 |
full_search: for (vma = find_vma(mm, addr); ; vma = vma->vm_next) { /* At this point: (!vma || addr < vma->vm_end). */ if (TASK_SIZE - len < addr) { /* * Start a new search - just in case we missed * some holes. */ if (start_addr != TASK_UNMAPPED_BASE) { |
1363c3cd8 [PATCH] Avoiding ... |
1386 1387 1388 |
addr = TASK_UNMAPPED_BASE; start_addr = addr; mm->cached_hole_size = 0; |
1da177e4c Linux-2.6.12-rc2 |
1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 |
goto full_search; } return -ENOMEM; } if (!vma || addr + len <= vma->vm_start) { /* * Remember the place where we stopped the search: */ mm->free_area_cache = addr + len; return addr; } |
1363c3cd8 [PATCH] Avoiding ... |
1400 1401 |
if (addr + mm->cached_hole_size < vma->vm_start) mm->cached_hole_size = vma->vm_start - addr; |
1da177e4c Linux-2.6.12-rc2 |
1402 1403 1404 1405 |
addr = vma->vm_end; } } #endif |
1363c3cd8 [PATCH] Avoiding ... |
1406 |
void arch_unmap_area(struct mm_struct *mm, unsigned long addr) |
1da177e4c Linux-2.6.12-rc2 |
1407 1408 1409 1410 |
{ /* * Is this a new hole at the lowest possible address? */ |
1363c3cd8 [PATCH] Avoiding ... |
1411 1412 1413 1414 |
if (addr >= TASK_UNMAPPED_BASE && addr < mm->free_area_cache) { mm->free_area_cache = addr; mm->cached_hole_size = ~0UL; } |
1da177e4c Linux-2.6.12-rc2 |
1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 |
} /* * 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) { struct vm_area_struct *vma; struct mm_struct *mm = current->mm; unsigned long addr = addr0; /* requested length too big for entire address space */ if (len > TASK_SIZE) return -ENOMEM; |
06abdfb47 get_unmapped_area... |
1434 1435 |
if (flags & MAP_FIXED) return addr; |
1da177e4c Linux-2.6.12-rc2 |
1436 1437 1438 1439 1440 1441 1442 1443 |
/* requesting a specific address */ if (addr) { addr = PAGE_ALIGN(addr); vma = find_vma(mm, addr); if (TASK_SIZE - len >= addr && (!vma || addr + len <= vma->vm_start)) return addr; } |
1363c3cd8 [PATCH] Avoiding ... |
1444 1445 1446 1447 1448 |
/* check if free_area_cache is useful for us */ if (len <= mm->cached_hole_size) { mm->cached_hole_size = 0; mm->free_area_cache = mm->mmap_base; } |
1da177e4c Linux-2.6.12-rc2 |
1449 1450 1451 1452 |
/* either no address requested or can't fit in requested address hole */ addr = mm->free_area_cache; /* make sure it can fit in the remaining address space */ |
49a43876b [PATCH] prevent N... |
1453 |
if (addr > len) { |
1da177e4c Linux-2.6.12-rc2 |
1454 1455 1456 1457 1458 |
vma = find_vma(mm, addr-len); if (!vma || addr <= vma->vm_start) /* remember the address as a hint for next time */ return (mm->free_area_cache = addr-len); } |
73219d178 [PATCH] mmap topd... |
1459 1460 |
if (mm->mmap_base < len) goto bottomup; |
1da177e4c Linux-2.6.12-rc2 |
1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 |
addr = mm->mmap_base-len; do { /* * Lookup failure means no vma is above this address, * else if new region fits below vma->vm_start, * return with success: */ vma = find_vma(mm, addr); if (!vma || addr+len <= vma->vm_start) /* remember the address as a hint for next time */ return (mm->free_area_cache = addr); |
1363c3cd8 [PATCH] Avoiding ... |
1473 1474 1475 |
/* remember the largest hole we saw so far */ if (addr + mm->cached_hole_size < vma->vm_start) mm->cached_hole_size = vma->vm_start - addr; |
1da177e4c Linux-2.6.12-rc2 |
1476 1477 |
/* try just below the current vma->vm_start */ addr = vma->vm_start-len; |
49a43876b [PATCH] prevent N... |
1478 |
} while (len < vma->vm_start); |
1da177e4c Linux-2.6.12-rc2 |
1479 |
|
73219d178 [PATCH] mmap topd... |
1480 |
bottomup: |
1da177e4c Linux-2.6.12-rc2 |
1481 1482 1483 1484 1485 1486 |
/* * 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. */ |
1363c3cd8 [PATCH] Avoiding ... |
1487 1488 |
mm->cached_hole_size = ~0UL; mm->free_area_cache = TASK_UNMAPPED_BASE; |
1da177e4c Linux-2.6.12-rc2 |
1489 1490 1491 1492 1493 |
addr = arch_get_unmapped_area(filp, addr0, len, pgoff, flags); /* * Restore the topdown base: */ mm->free_area_cache = mm->mmap_base; |
1363c3cd8 [PATCH] Avoiding ... |
1494 |
mm->cached_hole_size = ~0UL; |
1da177e4c Linux-2.6.12-rc2 |
1495 1496 1497 1498 |
return addr; } #endif |
1363c3cd8 [PATCH] Avoiding ... |
1499 |
void arch_unmap_area_topdown(struct mm_struct *mm, unsigned long addr) |
1da177e4c Linux-2.6.12-rc2 |
1500 1501 1502 1503 |
{ /* * Is this a new hole at the highest possible address? */ |
1363c3cd8 [PATCH] Avoiding ... |
1504 1505 |
if (addr > mm->free_area_cache) mm->free_area_cache = addr; |
1da177e4c Linux-2.6.12-rc2 |
1506 1507 |
/* dont allow allocations above current base */ |
1363c3cd8 [PATCH] Avoiding ... |
1508 1509 |
if (mm->free_area_cache > mm->mmap_base) mm->free_area_cache = mm->mmap_base; |
1da177e4c Linux-2.6.12-rc2 |
1510 1511 1512 1513 1514 1515 |
} unsigned long get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) { |
06abdfb47 get_unmapped_area... |
1516 1517 |
unsigned long (*get_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); |
9206de95b Take arch_mmap_ch... |
1518 1519 1520 1521 1522 1523 1524 |
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... |
1525 1526 1527 1528 1529 1530 |
get_area = current->mm->get_unmapped_area; if (file && file->f_op && file->f_op->get_unmapped_area) get_area = file->f_op->get_unmapped_area; addr = get_area(file, addr, len, pgoff, flags); if (IS_ERR_VALUE(addr)) return addr; |
1da177e4c Linux-2.6.12-rc2 |
1531 |
|
07ab67c8d Fix get_unmapped_... |
1532 1533 1534 1535 |
if (addr > TASK_SIZE - len) return -ENOMEM; if (addr & ~PAGE_MASK) return -EINVAL; |
06abdfb47 get_unmapped_area... |
1536 |
|
08e7d9b55 arch_rebalance_pg... |
1537 |
return arch_rebalance_pgtables(addr, len); |
1da177e4c Linux-2.6.12-rc2 |
1538 1539 1540 1541 1542 |
} EXPORT_SYMBOL(get_unmapped_area); /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */ |
48aae4255 mm/mmap.c: fix co... |
1543 |
struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr) |
1da177e4c Linux-2.6.12-rc2 |
1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 |
{ struct vm_area_struct *vma = NULL; if (mm) { /* Check the cache first. */ /* (Cache hit rate is typically around 35%.) */ vma = mm->mmap_cache; if (!(vma && vma->vm_end > addr && vma->vm_start <= addr)) { struct rb_node * rb_node; rb_node = mm->mm_rb.rb_node; vma = NULL; while (rb_node) { struct vm_area_struct * vma_tmp; vma_tmp = rb_entry(rb_node, struct vm_area_struct, vm_rb); if (vma_tmp->vm_end > addr) { vma = vma_tmp; if (vma_tmp->vm_start <= addr) break; rb_node = rb_node->rb_left; } else rb_node = rb_node->rb_right; } if (vma) mm->mmap_cache = vma; } } return vma; } EXPORT_SYMBOL(find_vma); /* Same as find_vma, but also return a pointer to the previous VMA in *pprev. */ struct vm_area_struct * find_vma_prev(struct mm_struct *mm, unsigned long addr, struct vm_area_struct **pprev) { struct vm_area_struct *vma = NULL, *prev = NULL; |
48aae4255 mm/mmap.c: fix co... |
1586 |
struct rb_node *rb_node; |
1da177e4c Linux-2.6.12-rc2 |
1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 |
if (!mm) goto out; /* Guard against addr being lower than the first VMA */ vma = mm->mmap; /* Go through the RB tree quickly. */ rb_node = mm->mm_rb.rb_node; while (rb_node) { struct vm_area_struct *vma_tmp; vma_tmp = rb_entry(rb_node, struct vm_area_struct, vm_rb); if (addr < vma_tmp->vm_end) { rb_node = rb_node->rb_left; } else { prev = vma_tmp; if (!prev->vm_next || (addr < prev->vm_next->vm_end)) break; rb_node = rb_node->rb_right; } } out: *pprev = prev; return prev ? prev->vm_next : vma; } /* * Verify that the stack growth is acceptable and * update accounting. This is shared with both the * grow-up and grow-down cases. */ |
48aae4255 mm/mmap.c: fix co... |
1620 |
static int acct_stack_growth(struct vm_area_struct *vma, unsigned long size, unsigned long grow) |
1da177e4c Linux-2.6.12-rc2 |
1621 1622 1623 |
{ struct mm_struct *mm = vma->vm_mm; struct rlimit *rlim = current->signal->rlim; |
0d59a01bc [PATCH] Don't all... |
1624 |
unsigned long new_start; |
1da177e4c Linux-2.6.12-rc2 |
1625 1626 |
/* address space limit tests */ |
119f657c7 [PATCH] RLIMIT_AS... |
1627 |
if (!may_expand_vm(mm, grow)) |
1da177e4c Linux-2.6.12-rc2 |
1628 1629 1630 |
return -ENOMEM; /* Stack limit test */ |
59e99e5b9 mm: use rlimit he... |
1631 |
if (size > ACCESS_ONCE(rlim[RLIMIT_STACK].rlim_cur)) |
1da177e4c Linux-2.6.12-rc2 |
1632 1633 1634 1635 1636 1637 1638 |
return -ENOMEM; /* mlock limit tests */ if (vma->vm_flags & VM_LOCKED) { unsigned long locked; unsigned long limit; locked = mm->locked_vm + grow; |
59e99e5b9 mm: use rlimit he... |
1639 1640 |
limit = ACCESS_ONCE(rlim[RLIMIT_MEMLOCK].rlim_cur); limit >>= PAGE_SHIFT; |
1da177e4c Linux-2.6.12-rc2 |
1641 1642 1643 |
if (locked > limit && !capable(CAP_IPC_LOCK)) return -ENOMEM; } |
0d59a01bc [PATCH] Don't all... |
1644 1645 1646 1647 1648 |
/* 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 |
1649 1650 1651 1652 |
/* * Overcommit.. This must be the final test, as it will * update security statistics. */ |
05fa199d4 mm: pass correct ... |
1653 |
if (security_vm_enough_memory_mm(mm, grow)) |
1da177e4c Linux-2.6.12-rc2 |
1654 1655 1656 1657 1658 1659 |
return -ENOMEM; /* Ok, everything looks good - let it rip */ mm->total_vm += grow; if (vma->vm_flags & VM_LOCKED) mm->locked_vm += grow; |
ab50b8ed8 [PATCH] mm: vm_st... |
1660 |
vm_stat_account(mm, vma->vm_flags, vma->vm_file, grow); |
1da177e4c Linux-2.6.12-rc2 |
1661 1662 |
return 0; } |
46dea3d09 [PATCH] mm: ia64 ... |
1663 |
#if defined(CONFIG_STACK_GROWSUP) || defined(CONFIG_IA64) |
1da177e4c Linux-2.6.12-rc2 |
1664 |
/* |
46dea3d09 [PATCH] mm: ia64 ... |
1665 1666 |
* 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 |
1667 |
*/ |
46dea3d09 [PATCH] mm: ia64 ... |
1668 |
int expand_upwards(struct vm_area_struct *vma, unsigned long address) |
1da177e4c Linux-2.6.12-rc2 |
1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 |
{ int error; if (!(vma->vm_flags & VM_GROWSUP)) return -EFAULT; /* * We must make sure the anon_vma is allocated * so that the anon_vma locking is not a noop. */ if (unlikely(anon_vma_prepare(vma))) return -ENOMEM; |
bb4a340e0 mm: rename anon_v... |
1681 |
vma_lock_anon_vma(vma); |
1da177e4c Linux-2.6.12-rc2 |
1682 1683 1684 1685 1686 |
/* * 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. |
06b32f3ab [PARISC] Handle w... |
1687 |
* Also guard against wrapping around to address 0. |
1da177e4c Linux-2.6.12-rc2 |
1688 |
*/ |
06b32f3ab [PARISC] Handle w... |
1689 1690 1691 |
if (address < PAGE_ALIGN(address+4)) address = PAGE_ALIGN(address+4); else { |
bb4a340e0 mm: rename anon_v... |
1692 |
vma_unlock_anon_vma(vma); |
06b32f3ab [PARISC] Handle w... |
1693 1694 |
return -ENOMEM; } |
1da177e4c Linux-2.6.12-rc2 |
1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 |
error = 0; /* 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; error = acct_stack_growth(vma, size, grow); |
3af9e8592 perf: Add non-exe... |
1705 |
if (!error) { |
1da177e4c Linux-2.6.12-rc2 |
1706 |
vma->vm_end = address; |
3af9e8592 perf: Add non-exe... |
1707 1708 |
perf_event_mmap(vma); } |
1da177e4c Linux-2.6.12-rc2 |
1709 |
} |
bb4a340e0 mm: rename anon_v... |
1710 |
vma_unlock_anon_vma(vma); |
1da177e4c Linux-2.6.12-rc2 |
1711 1712 |
return error; } |
46dea3d09 [PATCH] mm: ia64 ... |
1713 |
#endif /* CONFIG_STACK_GROWSUP || CONFIG_IA64 */ |
1da177e4c Linux-2.6.12-rc2 |
1714 1715 1716 |
/* * vma is the first one with address < vma->vm_start. Have to extend vma. */ |
cb8f488c3 mmap.c: deinline ... |
1717 |
static int expand_downwards(struct vm_area_struct *vma, |
b6a2fea39 mm: variable leng... |
1718 |
unsigned long address) |
1da177e4c Linux-2.6.12-rc2 |
1719 1720 1721 1722 1723 1724 1725 1726 1727 |
{ int error; /* * We must make sure the anon_vma is allocated * so that the anon_vma locking is not a noop. */ if (unlikely(anon_vma_prepare(vma))) return -ENOMEM; |
8869477a4 security: protect... |
1728 1729 |
address &= PAGE_MASK; |
88c3f7a8f Security: remove ... |
1730 |
error = security_file_mmap(NULL, 0, 0, 0, address, 1); |
8869477a4 security: protect... |
1731 1732 |
if (error) return error; |
bb4a340e0 mm: rename anon_v... |
1733 |
vma_lock_anon_vma(vma); |
1da177e4c Linux-2.6.12-rc2 |
1734 1735 1736 1737 1738 1739 |
/* * 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. */ |
1da177e4c Linux-2.6.12-rc2 |
1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 |
/* 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; error = acct_stack_growth(vma, size, grow); if (!error) { vma->vm_start = address; vma->vm_pgoff -= grow; |
3af9e8592 perf: Add non-exe... |
1752 |
perf_event_mmap(vma); |
1da177e4c Linux-2.6.12-rc2 |
1753 1754 |
} } |
bb4a340e0 mm: rename anon_v... |
1755 |
vma_unlock_anon_vma(vma); |
1da177e4c Linux-2.6.12-rc2 |
1756 1757 |
return error; } |
b6a2fea39 mm: variable leng... |
1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 |
int expand_stack_downwards(struct vm_area_struct *vma, unsigned long address) { return expand_downwards(vma, address); } #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_... |
1778 |
if (!prev || expand_stack(prev, addr)) |
b6a2fea39 mm: variable leng... |
1779 |
return NULL; |
ba470de43 mmap: handle mloc... |
1780 |
if (prev->vm_flags & VM_LOCKED) { |
c58267c32 mm: mlock_vma_pag... |
1781 |
mlock_vma_pages_range(prev, addr, prev->vm_end); |
ba470de43 mmap: handle mloc... |
1782 |
} |
b6a2fea39 mm: variable leng... |
1783 1784 1785 1786 1787 1788 1789 |
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 |
1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 |
struct vm_area_struct * find_extend_vma(struct mm_struct * mm, unsigned long addr) { struct vm_area_struct * vma; unsigned long start; addr &= PAGE_MASK; vma = find_vma(mm,addr); 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; |
ba470de43 mmap: handle mloc... |
1807 |
if (vma->vm_flags & VM_LOCKED) { |
c58267c32 mm: mlock_vma_pag... |
1808 |
mlock_vma_pages_range(vma, addr, start); |
ba470de43 mmap: handle mloc... |
1809 |
} |
1da177e4c Linux-2.6.12-rc2 |
1810 1811 1812 |
return vma; } #endif |
1da177e4c Linux-2.6.12-rc2 |
1813 |
/* |
2c0b38146 [PATCH] mm: remov... |
1814 |
* Ok - we have the memory areas we should free on the vma list, |
1da177e4c Linux-2.6.12-rc2 |
1815 |
* so release them, and do the vma updates. |
2c0b38146 [PATCH] mm: remov... |
1816 1817 |
* * Called with the mm semaphore held. |
1da177e4c Linux-2.6.12-rc2 |
1818 |
*/ |
2c0b38146 [PATCH] mm: remov... |
1819 |
static void remove_vma_list(struct mm_struct *mm, struct vm_area_struct *vma) |
1da177e4c Linux-2.6.12-rc2 |
1820 |
{ |
365e9c87a [PATCH] mm: updat... |
1821 1822 |
/* Update high watermark before we lower total_vm */ update_hiwater_vm(mm); |
1da177e4c Linux-2.6.12-rc2 |
1823 |
do { |
2c0b38146 [PATCH] mm: remov... |
1824 1825 1826 |
long nrpages = vma_pages(vma); mm->total_vm -= nrpages; |
2c0b38146 [PATCH] mm: remov... |
1827 |
vm_stat_account(mm, vma->vm_flags, vma->vm_file, -nrpages); |
a8fb5618d [PATCH] mm: unlin... |
1828 |
vma = remove_vma(vma); |
146425a31 [PATCH] freepgt: ... |
1829 |
} while (vma); |
1da177e4c Linux-2.6.12-rc2 |
1830 1831 1832 1833 1834 1835 |
validate_mm(mm); } /* * Get rid of page table information in the indicated region. * |
f10df6860 [PATCH] fix locki... |
1836 |
* Called with the mm semaphore held. |
1da177e4c Linux-2.6.12-rc2 |
1837 1838 |
*/ static void unmap_region(struct mm_struct *mm, |
e0da382c9 [PATCH] freepgt: ... |
1839 1840 |
struct vm_area_struct *vma, struct vm_area_struct *prev, unsigned long start, unsigned long end) |
1da177e4c Linux-2.6.12-rc2 |
1841 |
{ |
e0da382c9 [PATCH] freepgt: ... |
1842 |
struct vm_area_struct *next = prev? prev->vm_next: mm->mmap; |
1da177e4c Linux-2.6.12-rc2 |
1843 1844 1845 1846 1847 |
struct mmu_gather *tlb; unsigned long nr_accounted = 0; lru_add_drain(); tlb = tlb_gather_mmu(mm, 0); |
365e9c87a [PATCH] mm: updat... |
1848 |
update_hiwater_rss(mm); |
508034a32 [PATCH] mm: unmap... |
1849 |
unmap_vmas(&tlb, vma, start, end, &nr_accounted, NULL); |
1da177e4c Linux-2.6.12-rc2 |
1850 |
vm_unacct_memory(nr_accounted); |
42b777281 mm: remove double... |
1851 |
free_pgtables(tlb, vma, prev? prev->vm_end: FIRST_USER_ADDRESS, |
e0da382c9 [PATCH] freepgt: ... |
1852 |
next? next->vm_start: 0); |
1da177e4c Linux-2.6.12-rc2 |
1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 |
tlb_finish_mmu(tlb, start, end); } /* * 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; |
1363c3cd8 [PATCH] Avoiding ... |
1866 |
unsigned long addr; |
1da177e4c Linux-2.6.12-rc2 |
1867 1868 |
insertion_point = (prev ? &prev->vm_next : &mm->mmap); |
297c5eee3 mm: make the vma ... |
1869 |
vma->vm_prev = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1870 1871 1872 1873 1874 1875 1876 |
do { rb_erase(&vma->vm_rb, &mm->mm_rb); mm->map_count--; tail_vma = vma; vma = vma->vm_next; } while (vma && vma->vm_start < end); *insertion_point = vma; |
297c5eee3 mm: make the vma ... |
1877 1878 |
if (vma) vma->vm_prev = prev; |
1da177e4c Linux-2.6.12-rc2 |
1879 |
tail_vma->vm_next = NULL; |
1363c3cd8 [PATCH] Avoiding ... |
1880 1881 1882 1883 1884 |
if (mm->unmap_area == arch_unmap_area) addr = prev ? prev->vm_end : mm->mmap_base; else addr = vma ? vma->vm_start : mm->mmap_base; mm->unmap_area(mm, addr); |
1da177e4c Linux-2.6.12-rc2 |
1885 1886 1887 1888 |
mm->mmap_cache = NULL; /* Kill the cache. */ } /* |
659ace584 mmap: don't retur... |
1889 1890 |
* __split_vma() bypasses sysctl_max_map_count checking. We use this on the * munmap path where it doesn't make sense to fail. |
1da177e4c Linux-2.6.12-rc2 |
1891 |
*/ |
659ace584 mmap: don't retur... |
1892 |
static int __split_vma(struct mm_struct * mm, struct vm_area_struct * vma, |
1da177e4c Linux-2.6.12-rc2 |
1893 1894 1895 1896 |
unsigned long addr, int new_below) { struct mempolicy *pol; struct vm_area_struct *new; |
5beb49305 mm: change anon_v... |
1897 |
int err = -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1898 |
|
a55164389 hugetlb: modular ... |
1899 1900 |
if (is_vm_hugetlb_page(vma) && (addr & ~(huge_page_mask(hstate_vma(vma))))) |
1da177e4c Linux-2.6.12-rc2 |
1901 |
return -EINVAL; |
e94b17660 [PATCH] slab: rem... |
1902 |
new = kmem_cache_alloc(vm_area_cachep, GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
1903 |
if (!new) |
5beb49305 mm: change anon_v... |
1904 |
goto out_err; |
1da177e4c Linux-2.6.12-rc2 |
1905 1906 1907 |
/* most fields are the same, copy all, and then fixup */ *new = *vma; |
5beb49305 mm: change anon_v... |
1908 |
INIT_LIST_HEAD(&new->anon_vma_chain); |
1da177e4c Linux-2.6.12-rc2 |
1909 1910 1911 1912 1913 1914 |
if (new_below) new->vm_end = addr; else { new->vm_start = addr; new->vm_pgoff += ((addr - vma->vm_start) >> PAGE_SHIFT); } |
846a16bf0 mempolicy: rename... |
1915 |
pol = mpol_dup(vma_policy(vma)); |
1da177e4c Linux-2.6.12-rc2 |
1916 |
if (IS_ERR(pol)) { |
5beb49305 mm: change anon_v... |
1917 1918 |
err = PTR_ERR(pol); goto out_free_vma; |
1da177e4c Linux-2.6.12-rc2 |
1919 1920 |
} vma_set_policy(new, pol); |
5beb49305 mm: change anon_v... |
1921 1922 |
if (anon_vma_clone(new, vma)) goto out_free_mpol; |
925d1c401 procfs task exe s... |
1923 |
if (new->vm_file) { |
1da177e4c Linux-2.6.12-rc2 |
1924 |
get_file(new->vm_file); |
925d1c401 procfs task exe s... |
1925 1926 1927 |
if (vma->vm_flags & VM_EXECUTABLE) added_exe_file_vma(mm); } |
1da177e4c Linux-2.6.12-rc2 |
1928 1929 1930 1931 1932 |
if (new->vm_ops && new->vm_ops->open) new->vm_ops->open(new); if (new_below) |
5beb49305 mm: change anon_v... |
1933 |
err = vma_adjust(vma, addr, vma->vm_end, vma->vm_pgoff + |
1da177e4c Linux-2.6.12-rc2 |
1934 1935 |
((addr - new->vm_start) >> PAGE_SHIFT), new); else |
5beb49305 mm: change anon_v... |
1936 |
err = vma_adjust(vma, vma->vm_start, addr, vma->vm_pgoff, new); |
1da177e4c Linux-2.6.12-rc2 |
1937 |
|
5beb49305 mm: change anon_v... |
1938 1939 1940 1941 1942 |
/* Success. */ if (!err) return 0; /* Clean everything up if vma_adjust failed. */ |
589275338 mmap: check ->vm_... |
1943 1944 |
if (new->vm_ops && new->vm_ops->close) new->vm_ops->close(new); |
5beb49305 mm: change anon_v... |
1945 1946 1947 1948 1949 |
if (new->vm_file) { if (vma->vm_flags & VM_EXECUTABLE) removed_exe_file_vma(mm); fput(new->vm_file); } |
2aeadc30d mmap: call unlink... |
1950 |
unlink_anon_vmas(new); |
5beb49305 mm: change anon_v... |
1951 1952 1953 1954 1955 1956 |
out_free_mpol: mpol_put(pol); out_free_vma: kmem_cache_free(vm_area_cachep, new); out_err: return err; |
1da177e4c Linux-2.6.12-rc2 |
1957 |
} |
659ace584 mmap: don't retur... |
1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 |
/* * 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 |
1970 1971 1972 1973 1974 1975 1976 1977 |
/* 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> */ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len) { unsigned long end; |
146425a31 [PATCH] freepgt: ... |
1978 |
struct vm_area_struct *vma, *prev, *last; |
1da177e4c Linux-2.6.12-rc2 |
1979 1980 1981 1982 1983 1984 1985 1986 |
if ((start & ~PAGE_MASK) || start > TASK_SIZE || len > TASK_SIZE-start) return -EINVAL; if ((len = PAGE_ALIGN(len)) == 0) return -EINVAL; /* Find the first overlapping VMA */ |
146425a31 [PATCH] freepgt: ... |
1987 1988 |
vma = find_vma_prev(mm, start, &prev); if (!vma) |
1da177e4c Linux-2.6.12-rc2 |
1989 |
return 0; |
146425a31 [PATCH] freepgt: ... |
1990 |
/* we have start < vma->vm_end */ |
1da177e4c Linux-2.6.12-rc2 |
1991 1992 1993 |
/* if it doesn't overlap, we have nothing.. */ end = start + len; |
146425a31 [PATCH] freepgt: ... |
1994 |
if (vma->vm_start >= end) |
1da177e4c Linux-2.6.12-rc2 |
1995 1996 1997 1998 1999 2000 2001 2002 2003 |
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: ... |
2004 |
if (start > vma->vm_start) { |
659ace584 mmap: don't retur... |
2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 |
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 |
2016 2017 |
if (error) return error; |
146425a31 [PATCH] freepgt: ... |
2018 |
prev = vma; |
1da177e4c Linux-2.6.12-rc2 |
2019 2020 2021 2022 2023 |
} /* Does it split the last one? */ last = find_vma(mm, end); if (last && end > last->vm_start) { |
659ace584 mmap: don't retur... |
2024 |
int error = __split_vma(mm, last, end, 1); |
1da177e4c Linux-2.6.12-rc2 |
2025 2026 2027 |
if (error) return error; } |
146425a31 [PATCH] freepgt: ... |
2028 |
vma = prev? prev->vm_next: mm->mmap; |
1da177e4c Linux-2.6.12-rc2 |
2029 2030 |
/* |
ba470de43 mmap: handle mloc... |
2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 |
* 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 |
2045 2046 |
* Remove the vma's, and unmap the actual pages */ |
146425a31 [PATCH] freepgt: ... |
2047 2048 |
detach_vmas_to_be_unmapped(mm, vma, prev, end); unmap_region(mm, vma, prev, start, end); |
1da177e4c Linux-2.6.12-rc2 |
2049 2050 |
/* Fix up all other VM information */ |
2c0b38146 [PATCH] mm: remov... |
2051 |
remove_vma_list(mm, vma); |
1da177e4c Linux-2.6.12-rc2 |
2052 2053 2054 2055 2056 |
return 0; } EXPORT_SYMBOL(do_munmap); |
6a6160a7b [CVE-2009-0029] S... |
2057 |
SYSCALL_DEFINE2(munmap, unsigned long, addr, size_t, len) |
1da177e4c Linux-2.6.12-rc2 |
2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 |
{ int ret; struct mm_struct *mm = current->mm; profile_munmap(addr); down_write(&mm->mmap_sem); ret = do_munmap(mm, addr, len); up_write(&mm->mmap_sem); return ret; } static inline void verify_mm_writelocked(struct mm_struct *mm) { |
a241ec65a [PATCH] RCU tortu... |
2072 |
#ifdef CONFIG_DEBUG_VM |
1da177e4c Linux-2.6.12-rc2 |
2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 |
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. */ unsigned long do_brk(unsigned long addr, unsigned long len) { struct mm_struct * mm = current->mm; struct vm_area_struct * vma, * prev; unsigned long flags; struct rb_node ** rb_link, * rb_parent; pgoff_t pgoff = addr >> PAGE_SHIFT; |
3a4597568 [PATCH] IA64,spar... |
2092 |
int error; |
1da177e4c Linux-2.6.12-rc2 |
2093 2094 2095 2096 |
len = PAGE_ALIGN(len); if (!len) return addr; |
88c3f7a8f Security: remove ... |
2097 |
error = security_file_mmap(NULL, 0, 0, 0, addr, 1); |
5a211a5de VM/Security: add ... |
2098 2099 |
if (error) return error; |
3a4597568 [PATCH] IA64,spar... |
2100 |
flags = VM_DATA_DEFAULT_FLAGS | VM_ACCOUNT | mm->def_flags; |
2c6a10161 switch do_brk() t... |
2101 2102 |
error = get_unmapped_area(NULL, addr, len, 0, MAP_FIXED); if (error & ~PAGE_MASK) |
3a4597568 [PATCH] IA64,spar... |
2103 |
return error; |
1da177e4c Linux-2.6.12-rc2 |
2104 2105 2106 2107 2108 |
/* * mlock MCL_FUTURE? */ if (mm->def_flags & VM_LOCKED) { unsigned long locked, lock_limit; |
93ea1d0a1 [PATCH] RLIMIT_ME... |
2109 2110 |
locked = len >> PAGE_SHIFT; locked += mm->locked_vm; |
59e99e5b9 mm: use rlimit he... |
2111 |
lock_limit = rlimit(RLIMIT_MEMLOCK); |
93ea1d0a1 [PATCH] RLIMIT_ME... |
2112 |
lock_limit >>= PAGE_SHIFT; |
1da177e4c Linux-2.6.12-rc2 |
2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 |
if (locked > lock_limit && !capable(CAP_IPC_LOCK)) return -EAGAIN; } /* * 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 */ munmap_back: vma = find_vma_prepare(mm, addr, &prev, &rb_link, &rb_parent); if (vma && vma->vm_start < addr + len) { if (do_munmap(mm, addr, len)) return -ENOMEM; goto munmap_back; } /* Check against address space limits *after* clearing old maps... */ |
119f657c7 [PATCH] RLIMIT_AS... |
2135 |
if (!may_expand_vm(mm, len >> PAGE_SHIFT)) |
1da177e4c Linux-2.6.12-rc2 |
2136 2137 2138 2139 2140 2141 2142 |
return -ENOMEM; if (mm->map_count > sysctl_max_map_count) return -ENOMEM; if (security_vm_enough_memory(len >> PAGE_SHIFT)) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
2143 |
/* Can we just expand an old private anonymous mapping? */ |
ba470de43 mmap: handle mloc... |
2144 2145 2146 |
vma = vma_merge(mm, prev, addr, addr + len, flags, NULL, NULL, pgoff, NULL); if (vma) |
1da177e4c Linux-2.6.12-rc2 |
2147 2148 2149 2150 2151 |
goto out; /* * create a vma struct for an anonymous mapping */ |
c5e3b83e9 [PATCH] mm: use k... |
2152 |
vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
2153 2154 2155 2156 |
if (!vma) { vm_unacct_memory(len >> PAGE_SHIFT); return -ENOMEM; } |
1da177e4c Linux-2.6.12-rc2 |
2157 |
|
5beb49305 mm: change anon_v... |
2158 |
INIT_LIST_HEAD(&vma->anon_vma_chain); |
1da177e4c Linux-2.6.12-rc2 |
2159 2160 2161 2162 2163 |
vma->vm_mm = mm; vma->vm_start = addr; vma->vm_end = addr + len; vma->vm_pgoff = pgoff; vma->vm_flags = flags; |
3ed75eb8f setup vma->vm_pag... |
2164 |
vma->vm_page_prot = vm_get_page_prot(flags); |
1da177e4c Linux-2.6.12-rc2 |
2165 2166 |
vma_link(mm, vma, prev, rb_link, rb_parent); out: |
3af9e8592 perf: Add non-exe... |
2167 |
perf_event_mmap(vma); |
1da177e4c Linux-2.6.12-rc2 |
2168 2169 |
mm->total_vm += len >> PAGE_SHIFT; if (flags & VM_LOCKED) { |
ba470de43 mmap: handle mloc... |
2170 2171 |
if (!mlock_vma_pages_range(vma, addr, addr + len)) mm->locked_vm += (len >> PAGE_SHIFT); |
1da177e4c Linux-2.6.12-rc2 |
2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 |
} return addr; } EXPORT_SYMBOL(do_brk); /* Release all mmaps. */ void exit_mmap(struct mm_struct *mm) { struct mmu_gather *tlb; |
ba470de43 mmap: handle mloc... |
2182 |
struct vm_area_struct *vma; |
1da177e4c Linux-2.6.12-rc2 |
2183 |
unsigned long nr_accounted = 0; |
ee39b37b2 [PATCH] freepgt: ... |
2184 |
unsigned long end; |
1da177e4c Linux-2.6.12-rc2 |
2185 |
|
d6dd61c83 [PATCH] x86: PARA... |
2186 |
/* mm's last user has gone, and its about to be pulled down */ |
cddb8a5c1 mmu-notifiers: core |
2187 |
mmu_notifier_release(mm); |
d6dd61c83 [PATCH] x86: PARA... |
2188 |
|
ba470de43 mmap: handle mloc... |
2189 2190 2191 2192 2193 2194 2195 2196 |
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... |
2197 2198 |
arch_exit_mmap(mm); |
ba470de43 mmap: handle mloc... |
2199 |
vma = mm->mmap; |
9480c53e9 mm: rearrange exi... |
2200 2201 |
if (!vma) /* Can happen if dup_mmap() received an OOM */ return; |
1da177e4c Linux-2.6.12-rc2 |
2202 |
lru_add_drain(); |
1da177e4c Linux-2.6.12-rc2 |
2203 |
flush_cache_mm(mm); |
e0da382c9 [PATCH] freepgt: ... |
2204 |
tlb = tlb_gather_mmu(mm, 1); |
901608d90 mm: introduce get... |
2205 |
/* update_hiwater_rss(mm) here? but nobody should be looking */ |
e0da382c9 [PATCH] freepgt: ... |
2206 |
/* Use -1 here to ensure all VMAs in the mm are unmapped */ |
508034a32 [PATCH] mm: unmap... |
2207 |
end = unmap_vmas(&tlb, vma, 0, -1, &nr_accounted, NULL); |
1da177e4c Linux-2.6.12-rc2 |
2208 |
vm_unacct_memory(nr_accounted); |
9ba692948 ksm: fix oom dead... |
2209 |
|
42b777281 mm: remove double... |
2210 |
free_pgtables(tlb, vma, FIRST_USER_ADDRESS, 0); |
ee39b37b2 [PATCH] freepgt: ... |
2211 |
tlb_finish_mmu(tlb, 0, end); |
1da177e4c Linux-2.6.12-rc2 |
2212 |
|
1da177e4c Linux-2.6.12-rc2 |
2213 |
/* |
8f4f8c164 [PATCH] mm: unlin... |
2214 2215 |
* Walk the list again, actually closing and freeing it, * with preemption enabled, without holding any MM locks. |
1da177e4c Linux-2.6.12-rc2 |
2216 |
*/ |
a8fb5618d [PATCH] mm: unlin... |
2217 2218 |
while (vma) vma = remove_vma(vma); |
e0da382c9 [PATCH] freepgt: ... |
2219 |
|
e2cdef8c8 [PATCH] freepgt: ... |
2220 |
BUG_ON(mm->nr_ptes > (FIRST_USER_ADDRESS+PMD_SIZE-1)>>PMD_SHIFT); |
1da177e4c Linux-2.6.12-rc2 |
2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 |
} /* Insert vm structure into process list sorted by address * and into the inode's i_mmap tree. If vm_file is non-NULL * then i_mmap_lock is taken here. */ int insert_vm_struct(struct mm_struct * mm, struct vm_area_struct * vma) { struct vm_area_struct * __vma, * prev; struct rb_node ** rb_link, * rb_parent; /* * 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. */ if (!vma->vm_file) { BUG_ON(vma->anon_vma); vma->vm_pgoff = vma->vm_start >> PAGE_SHIFT; } __vma = find_vma_prepare(mm,vma->vm_start,&prev,&rb_link,&rb_parent); if (__vma && __vma->vm_start < vma->vm_end) return -ENOMEM; |
2fd4ef85e [PATCH] error pat... |
2251 |
if ((vma->vm_flags & VM_ACCOUNT) && |
34b4e4aa3 fix NULL pointer ... |
2252 |
security_vm_enough_memory_mm(mm, vma_pages(vma))) |
2fd4ef85e [PATCH] error pat... |
2253 |
return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 |
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, unsigned long addr, unsigned long len, pgoff_t pgoff) { 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; struct mempolicy *pol; /* * If anonymous vma has not yet been faulted, update new pgoff * to match new location, to increase its chance of merging. */ if (!vma->vm_file && !vma->anon_vma) pgoff = addr >> PAGE_SHIFT; find_vma_prepare(mm, addr, &prev, &rb_link, &rb_parent); new_vma = vma_merge(mm, prev, addr, addr + len, vma->vm_flags, vma->anon_vma, vma->vm_file, pgoff, vma_policy(vma)); if (new_vma) { /* * Source vma may have been merged into new_vma */ if (vma_start >= new_vma->vm_start && vma_start < new_vma->vm_end) *vmap = new_vma; } else { |
e94b17660 [PATCH] slab: rem... |
2290 |
new_vma = kmem_cache_alloc(vm_area_cachep, GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
2291 2292 |
if (new_vma) { *new_vma = *vma; |
846a16bf0 mempolicy: rename... |
2293 |
pol = mpol_dup(vma_policy(vma)); |
5beb49305 mm: change anon_v... |
2294 2295 2296 2297 2298 |
if (IS_ERR(pol)) goto out_free_vma; INIT_LIST_HEAD(&new_vma->anon_vma_chain); if (anon_vma_clone(new_vma, vma)) goto out_free_mempol; |
1da177e4c Linux-2.6.12-rc2 |
2299 2300 2301 2302 |
vma_set_policy(new_vma, pol); new_vma->vm_start = addr; new_vma->vm_end = addr + len; new_vma->vm_pgoff = pgoff; |
925d1c401 procfs task exe s... |
2303 |
if (new_vma->vm_file) { |
1da177e4c Linux-2.6.12-rc2 |
2304 |
get_file(new_vma->vm_file); |
925d1c401 procfs task exe s... |
2305 2306 2307 |
if (vma->vm_flags & VM_EXECUTABLE) added_exe_file_vma(mm); } |
1da177e4c Linux-2.6.12-rc2 |
2308 2309 2310 2311 2312 2313 |
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); } } return new_vma; |
5beb49305 mm: change anon_v... |
2314 2315 2316 2317 2318 2319 |
out_free_mempol: mpol_put(pol); out_free_vma: kmem_cache_free(vm_area_cachep, new_vma); return NULL; |
1da177e4c Linux-2.6.12-rc2 |
2320 |
} |
119f657c7 [PATCH] RLIMIT_AS... |
2321 2322 2323 2324 2325 2326 2327 2328 2329 |
/* * Return true if the calling process may expand its vm space by the passed * number of pages */ int may_expand_vm(struct mm_struct *mm, unsigned long npages) { unsigned long cur = mm->total_vm; /* pages */ unsigned long lim; |
59e99e5b9 mm: use rlimit he... |
2330 |
lim = rlimit(RLIMIT_AS) >> PAGE_SHIFT; |
119f657c7 [PATCH] RLIMIT_AS... |
2331 2332 2333 2334 2335 |
if (cur + npages > lim) return 0; return 1; } |
fa5dc22f8 [PATCH] Add insta... |
2336 |
|
b1d0e4f53 mm: special mappi... |
2337 2338 |
static int special_mapping_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
fa5dc22f8 [PATCH] Add insta... |
2339 |
{ |
b1d0e4f53 mm: special mappi... |
2340 |
pgoff_t pgoff; |
fa5dc22f8 [PATCH] Add insta... |
2341 |
struct page **pages; |
b1d0e4f53 mm: special mappi... |
2342 2343 2344 2345 2346 2347 2348 |
/* * special mappings have no vm_file, and in that case, the mm * uses vm_pgoff internally. So we have to subtract it from here. * We are allowed to do this because we are the mm; do not copy * this code into drivers! */ pgoff = vmf->pgoff - vma->vm_pgoff; |
fa5dc22f8 [PATCH] Add insta... |
2349 |
|
b1d0e4f53 mm: special mappi... |
2350 2351 |
for (pages = vma->vm_private_data; pgoff && *pages; ++pages) pgoff--; |
fa5dc22f8 [PATCH] Add insta... |
2352 2353 2354 2355 |
if (*pages) { struct page *page = *pages; get_page(page); |
b1d0e4f53 mm: special mappi... |
2356 2357 |
vmf->page = page; return 0; |
fa5dc22f8 [PATCH] Add insta... |
2358 |
} |
b1d0e4f53 mm: special mappi... |
2359 |
return VM_FAULT_SIGBUS; |
fa5dc22f8 [PATCH] Add insta... |
2360 2361 2362 2363 2364 2365 2366 2367 |
} /* * Having a close hook prevents vma merging regardless of flags. */ static void special_mapping_close(struct vm_area_struct *vma) { } |
f0f37e2f7 const: mark struc... |
2368 |
static const struct vm_operations_struct special_mapping_vmops = { |
fa5dc22f8 [PATCH] Add insta... |
2369 |
.close = special_mapping_close, |
b1d0e4f53 mm: special mappi... |
2370 |
.fault = special_mapping_fault, |
fa5dc22f8 [PATCH] Add insta... |
2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 |
}; /* * 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. */ int install_special_mapping(struct mm_struct *mm, unsigned long addr, unsigned long len, unsigned long vm_flags, struct page **pages) { struct vm_area_struct *vma; vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL); if (unlikely(vma == NULL)) return -ENOMEM; |
5beb49305 mm: change anon_v... |
2391 |
INIT_LIST_HEAD(&vma->anon_vma_chain); |
fa5dc22f8 [PATCH] Add insta... |
2392 2393 2394 |
vma->vm_mm = mm; vma->vm_start = addr; vma->vm_end = addr + len; |
2f98735c9 vm audit: add VM_... |
2395 |
vma->vm_flags = vm_flags | mm->def_flags | VM_DONTEXPAND; |
3ed75eb8f setup vma->vm_pag... |
2396 |
vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); |
fa5dc22f8 [PATCH] Add insta... |
2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 |
vma->vm_ops = &special_mapping_vmops; vma->vm_private_data = pages; if (unlikely(insert_vm_struct(mm, vma))) { kmem_cache_free(vm_area_cachep, vma); return -ENOMEM; } mm->total_vm += len >> PAGE_SHIFT; |
cdd6c482c perf: Do the big ... |
2407 |
perf_event_mmap(vma); |
089dd79db perf_counter: Gen... |
2408 |
|
fa5dc22f8 [PATCH] Add insta... |
2409 2410 |
return 0; } |
7906d00cd mmu-notifiers: ad... |
2411 2412 |
static DEFINE_MUTEX(mm_all_locks_mutex); |
454ed842d lockdep: annotate... |
2413 |
static void vm_lock_anon_vma(struct mm_struct *mm, struct anon_vma *anon_vma) |
7906d00cd mmu-notifiers: ad... |
2414 |
{ |
012f18004 mm: always lock t... |
2415 |
if (!test_bit(0, (unsigned long *) &anon_vma->root->head.next)) { |
7906d00cd mmu-notifiers: ad... |
2416 2417 2418 2419 |
/* * The LSB of head.next can't change from under us * because we hold the mm_all_locks_mutex. */ |
012f18004 mm: always lock t... |
2420 |
spin_lock_nest_lock(&anon_vma->root->lock, &mm->mmap_sem); |
7906d00cd mmu-notifiers: ad... |
2421 2422 |
/* * We can safely modify head.next after taking the |
012f18004 mm: always lock t... |
2423 |
* anon_vma->root->lock. If some other vma in this mm shares |
7906d00cd mmu-notifiers: ad... |
2424 2425 2426 2427 |
* 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 |
012f18004 mm: always lock t... |
2428 |
* anon_vma->root->lock. |
7906d00cd mmu-notifiers: ad... |
2429 2430 |
*/ if (__test_and_set_bit(0, (unsigned long *) |
012f18004 mm: always lock t... |
2431 |
&anon_vma->root->head.next)) |
7906d00cd mmu-notifiers: ad... |
2432 2433 2434 |
BUG(); } } |
454ed842d lockdep: annotate... |
2435 |
static void vm_lock_mapping(struct mm_struct *mm, struct address_space *mapping) |
7906d00cd mmu-notifiers: ad... |
2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 |
{ 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(); |
454ed842d lockdep: annotate... |
2449 |
spin_lock_nest_lock(&mapping->i_mmap_lock, &mm->mmap_sem); |
7906d00cd mmu-notifiers: ad... |
2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 |
} } /* * 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 * altering the vma layout (for example populate_range() with * nonlinear vmas). It's also needed in write mode to avoid new * 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. * * The LSB in anon_vma->head.next and the AS_MM_ALL_LOCKS bitflag in * 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. * * We can take all the locks in random order because the VM code * taking i_mmap_lock or anon_vma->lock outside the mmap_sem never * takes more than one of them in a row. Secondly we're protected * against a concurrent mm_take_all_locks() by the mm_all_locks_mutex. * * 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... |
2488 |
struct anon_vma_chain *avc; |
7906d00cd mmu-notifiers: ad... |
2489 2490 2491 2492 2493 2494 2495 2496 2497 |
int ret = -EINTR; 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; |
7906d00cd mmu-notifiers: ad... |
2498 |
if (vma->vm_file && vma->vm_file->f_mapping) |
454ed842d lockdep: annotate... |
2499 |
vm_lock_mapping(mm, vma->vm_file->f_mapping); |
7906d00cd mmu-notifiers: ad... |
2500 |
} |
7cd5a02f5 mm: fix mm_take_a... |
2501 2502 2503 2504 2505 |
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... |
2506 2507 |
list_for_each_entry(avc, &vma->anon_vma_chain, same_vma) vm_lock_anon_vma(mm, avc->anon_vma); |
7906d00cd mmu-notifiers: ad... |
2508 |
} |
7cd5a02f5 mm: fix mm_take_a... |
2509 |
|
7906d00cd mmu-notifiers: ad... |
2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 |
ret = 0; out_unlock: if (ret) mm_drop_all_locks(mm); return ret; } static void vm_unlock_anon_vma(struct anon_vma *anon_vma) { |
012f18004 mm: always lock t... |
2521 |
if (test_bit(0, (unsigned long *) &anon_vma->root->head.next)) { |
7906d00cd mmu-notifiers: ad... |
2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 |
/* * 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 * the vma so the users using the anon_vma->head will * never see our bitflag. * * No need of atomic instructions here, head.next * can't change from under us until we release the |
012f18004 mm: always lock t... |
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* anon_vma->root->lock. |
7906d00cd mmu-notifiers: ad... |
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*/ if (!__test_and_clear_bit(0, (unsigned long *) |
012f18004 mm: always lock t... |
2535 |
&anon_vma->root->head.next)) |
7906d00cd mmu-notifiers: ad... |
2536 |
BUG(); |
cba48b98f mm: change direct... |
2537 |
anon_vma_unlock(anon_vma); |
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} } 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. */ spin_unlock(&mapping->i_mmap_lock); 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... |
2562 |
struct anon_vma_chain *avc; |
7906d00cd mmu-notifiers: ad... |
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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... |
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list_for_each_entry(avc, &vma->anon_vma_chain, same_vma) vm_unlock_anon_vma(avc->anon_vma); |
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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 ... |
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/* * initialise the VMA slab */ void __init mmap_init(void) { |
00a62ce91 mm: fix Committed... |
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int ret; ret = percpu_counter_init(&vm_committed_as, 0); VM_BUG_ON(ret); |
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} |