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mm/nommu.c
35.8 KB
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/* * linux/mm/nommu.c * * Replacement code for mm functions to support CPU's that don't * have any form of memory management unit (thus no virtual memory). * * See Documentation/nommu-mmap.txt * * Copyright (c) 2004-2005 David Howells <dhowells@redhat.com> * Copyright (c) 2000-2003 David McCullough <davidm@snapgear.com> * Copyright (c) 2000-2001 D Jeff Dionne <jeff@uClinux.org> * Copyright (c) 2002 Greg Ungerer <gerg@snapgear.com> |
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* Copyright (c) 2007 Paul Mundt <lethal@linux-sh.org> |
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*/ |
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#include <linux/module.h> |
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#include <linux/mm.h> #include <linux/mman.h> #include <linux/swap.h> #include <linux/file.h> #include <linux/highmem.h> #include <linux/pagemap.h> #include <linux/slab.h> #include <linux/vmalloc.h> |
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#include <linux/tracehook.h> |
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#include <linux/blkdev.h> #include <linux/backing-dev.h> #include <linux/mount.h> #include <linux/personality.h> #include <linux/security.h> #include <linux/syscalls.h> #include <asm/uaccess.h> #include <asm/tlb.h> #include <asm/tlbflush.h> |
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#include "internal.h" |
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void *high_memory; struct page *mem_map; unsigned long max_mapnr; unsigned long num_physpages; unsigned long askedalloc, realalloc; |
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atomic_long_t vm_committed_space = ATOMIC_LONG_INIT(0); |
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int sysctl_overcommit_memory = OVERCOMMIT_GUESS; /* heuristic overcommit */ int sysctl_overcommit_ratio = 50; /* default is 50% */ int sysctl_max_map_count = DEFAULT_MAX_MAP_COUNT; int heap_stack_gap = 0; EXPORT_SYMBOL(mem_map); |
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EXPORT_SYMBOL(num_physpages); |
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/* list of shareable VMAs */ struct rb_root nommu_vma_tree = RB_ROOT; DECLARE_RWSEM(nommu_vma_sem); struct vm_operations_struct generic_file_vm_ops = { }; /* * Handle all mappings that got truncated by a "truncate()" * system call. * * NOTE! We have to be ready to update the memory sharing * between the file and the memory map for a potential last * incomplete page. Ugly, but necessary. */ int vmtruncate(struct inode *inode, loff_t offset) { struct address_space *mapping = inode->i_mapping; unsigned long limit; if (inode->i_size < offset) goto do_expand; i_size_write(inode, offset); truncate_inode_pages(mapping, offset); goto out_truncate; do_expand: limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur; if (limit != RLIM_INFINITY && offset > limit) goto out_sig; if (offset > inode->i_sb->s_maxbytes) goto out; i_size_write(inode, offset); out_truncate: |
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if (inode->i_op->truncate) |
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inode->i_op->truncate(inode); return 0; out_sig: send_sig(SIGXFSZ, current, 0); out: return -EFBIG; } EXPORT_SYMBOL(vmtruncate); /* * Return the total memory allocated for this pointer, not * just what the caller asked for. * * Doesn't have to be accurate, i.e. may have races. */ unsigned int kobjsize(const void *objp) { struct page *page; |
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/* * If the object we have should not have ksize performed on it, * return size of 0 */ |
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if (!objp || !virt_addr_valid(objp)) |
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return 0; page = virt_to_head_page(objp); |
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/* * If the allocator sets PageSlab, we know the pointer came from * kmalloc(). */ |
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if (PageSlab(page)) return ksize(objp); |
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/* * The ksize() function is only guaranteed to work for pointers |
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* returned by kmalloc(). So handle arbitrary pointers here. |
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*/ |
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return PAGE_SIZE << compound_order(page); |
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} |
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int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm, unsigned long start, int len, int flags, struct page **pages, struct vm_area_struct **vmas) |
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{ |
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struct vm_area_struct *vma; |
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unsigned long vm_flags; int i; |
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int write = !!(flags & GUP_FLAGS_WRITE); int force = !!(flags & GUP_FLAGS_FORCE); int ignore = !!(flags & GUP_FLAGS_IGNORE_VMA_PERMISSIONS); |
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/* calculate required read or write permissions. * - if 'force' is set, we only require the "MAY" flags. */ vm_flags = write ? (VM_WRITE | VM_MAYWRITE) : (VM_READ | VM_MAYREAD); vm_flags &= force ? (VM_MAYREAD | VM_MAYWRITE) : (VM_READ | VM_WRITE); |
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for (i = 0; i < len; i++) { |
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vma = find_vma(mm, start); |
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if (!vma) goto finish_or_fault; /* protect what we can, including chardevs */ if (vma->vm_flags & (VM_IO | VM_PFNMAP) || |
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(!ignore && !(vm_flags & vma->vm_flags))) |
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goto finish_or_fault; |
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|
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if (pages) { pages[i] = virt_to_page(start); if (pages[i]) page_cache_get(pages[i]); } if (vmas) |
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vmas[i] = vma; |
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start += PAGE_SIZE; } |
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return i; finish_or_fault: return i ? : -EFAULT; |
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} |
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/* * get a list of pages in an address range belonging to the specified process * and indicate the VMA that covers each page * - this is potentially dodgy as we may end incrementing the page count of a * slab page or a secondary page from a compound page * - don't permit access to VMAs that don't support it, such as I/O mappings */ int get_user_pages(struct task_struct *tsk, struct mm_struct *mm, unsigned long start, int len, int write, int force, struct page **pages, struct vm_area_struct **vmas) { int flags = 0; if (write) flags |= GUP_FLAGS_WRITE; if (force) flags |= GUP_FLAGS_FORCE; return __get_user_pages(tsk, mm, start, len, flags, pages, vmas); } |
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EXPORT_SYMBOL(get_user_pages); |
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DEFINE_RWLOCK(vmlist_lock); struct vm_struct *vmlist; |
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void vfree(const void *addr) |
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{ kfree(addr); } |
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EXPORT_SYMBOL(vfree); |
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|
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void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot) |
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{ /* |
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* You can't specify __GFP_HIGHMEM with kmalloc() since kmalloc() * returns only a logical address. |
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*/ |
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return kmalloc(size, (gfp_mask | __GFP_COMP) & ~__GFP_HIGHMEM); |
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} |
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EXPORT_SYMBOL(__vmalloc); |
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|
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void *vmalloc_user(unsigned long size) { void *ret; ret = __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL); if (ret) { struct vm_area_struct *vma; down_write(¤t->mm->mmap_sem); vma = find_vma(current->mm, (unsigned long)ret); if (vma) vma->vm_flags |= VM_USERMAP; up_write(¤t->mm->mmap_sem); } return ret; } EXPORT_SYMBOL(vmalloc_user); |
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struct page *vmalloc_to_page(const void *addr) |
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{ return virt_to_page(addr); } |
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EXPORT_SYMBOL(vmalloc_to_page); |
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|
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unsigned long vmalloc_to_pfn(const void *addr) |
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{ return page_to_pfn(virt_to_page(addr)); } |
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EXPORT_SYMBOL(vmalloc_to_pfn); |
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long vread(char *buf, char *addr, unsigned long count) { memcpy(buf, addr, count); return count; } long vwrite(char *buf, char *addr, unsigned long count) { /* Don't allow overflow */ if ((unsigned long) addr + count < count) count = -(unsigned long) addr; memcpy(addr, buf, count); return(count); } /* * vmalloc - allocate virtually continguos memory * * @size: allocation size * * Allocate enough pages to cover @size from the page level * allocator and map them into continguos kernel virtual space. * |
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* For tight control over page level allocator and protection flags |
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* use __vmalloc() instead. */ void *vmalloc(unsigned long size) { return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL); } |
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EXPORT_SYMBOL(vmalloc); void *vmalloc_node(unsigned long size, int node) { return vmalloc(size); } EXPORT_SYMBOL(vmalloc_node); |
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#ifndef PAGE_KERNEL_EXEC # define PAGE_KERNEL_EXEC PAGE_KERNEL #endif /** * vmalloc_exec - allocate virtually contiguous, executable memory * @size: allocation size * * Kernel-internal function to allocate enough pages to cover @size * the page level allocator and map them into contiguous and * executable kernel virtual space. * * For tight control over page level allocator and protection flags * use __vmalloc() instead. */ void *vmalloc_exec(unsigned long size) { return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL_EXEC); } |
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/** * vmalloc_32 - allocate virtually contiguous memory (32bit addressable) |
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* @size: allocation size * * Allocate enough 32bit PA addressable pages to cover @size from the * page level allocator and map them into continguos kernel virtual space. */ void *vmalloc_32(unsigned long size) { return __vmalloc(size, GFP_KERNEL, PAGE_KERNEL); } |
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EXPORT_SYMBOL(vmalloc_32); /** * vmalloc_32_user - allocate zeroed virtually contiguous 32bit memory * @size: allocation size * * The resulting memory area is 32bit addressable and zeroed so it can be * mapped to userspace without leaking data. |
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* * VM_USERMAP is set on the corresponding VMA so that subsequent calls to * remap_vmalloc_range() are permissible. |
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*/ void *vmalloc_32_user(unsigned long size) { |
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/* * We'll have to sort out the ZONE_DMA bits for 64-bit, * but for now this can simply use vmalloc_user() directly. */ return vmalloc_user(size); |
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} EXPORT_SYMBOL(vmalloc_32_user); |
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void *vmap(struct page **pages, unsigned int count, unsigned long flags, pgprot_t prot) { BUG(); return NULL; } |
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EXPORT_SYMBOL(vmap); |
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|
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void vunmap(const void *addr) |
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{ BUG(); } |
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EXPORT_SYMBOL(vunmap); |
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/* |
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* Implement a stub for vmalloc_sync_all() if the architecture chose not to * have one. */ void __attribute__((weak)) vmalloc_sync_all(void) { } |
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int vm_insert_page(struct vm_area_struct *vma, unsigned long addr, struct page *page) { return -EINVAL; } EXPORT_SYMBOL(vm_insert_page); |
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/* |
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* sys_brk() for the most part doesn't need the global kernel * lock, except when an application is doing something nasty * like trying to un-brk an area that has already been mapped * to a regular file. in this case, the unmapping will need * to invoke file system routines that need the global lock. */ asmlinkage unsigned long sys_brk(unsigned long brk) { struct mm_struct *mm = current->mm; if (brk < mm->start_brk || brk > mm->context.end_brk) return mm->brk; if (mm->brk == brk) return mm->brk; /* * Always allow shrinking brk */ if (brk <= mm->brk) { mm->brk = brk; return brk; } /* * Ok, looks good - let it rip. */ return mm->brk = brk; } #ifdef DEBUG static void show_process_blocks(void) { struct vm_list_struct *vml; printk("Process blocks %d:", current->pid); for (vml = ¤t->mm->context.vmlist; vml; vml = vml->next) { printk(" %p: %p", vml, vml->vma); if (vml->vma) printk(" (%d @%lx #%d)", kobjsize((void *) vml->vma->vm_start), vml->vma->vm_start, atomic_read(&vml->vma->vm_usage)); printk(vml->next ? " ->" : ". "); } } #endif /* DEBUG */ |
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/* * add a VMA into a process's mm_struct in the appropriate place in the list * - should be called with mm->mmap_sem held writelocked */ static void add_vma_to_mm(struct mm_struct *mm, struct vm_list_struct *vml) { struct vm_list_struct **ppv; for (ppv = ¤t->mm->context.vmlist; *ppv; ppv = &(*ppv)->next) if ((*ppv)->vma->vm_start > vml->vma->vm_start) break; vml->next = *ppv; *ppv = vml; } /* * look up the first VMA in which addr resides, NULL if none * - should be called with mm->mmap_sem at least held readlocked */ struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr) { struct vm_list_struct *loop, *vml; /* search the vm_start ordered list */ vml = NULL; for (loop = mm->context.vmlist; loop; loop = loop->next) { if (loop->vma->vm_start > addr) break; vml = loop; } if (vml && vml->vma->vm_end > addr) return vml->vma; return NULL; } EXPORT_SYMBOL(find_vma); /* |
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* find a VMA * - we don't extend stack VMAs under NOMMU conditions */ struct vm_area_struct *find_extend_vma(struct mm_struct *mm, unsigned long addr) { return find_vma(mm, addr); } |
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int expand_stack(struct vm_area_struct *vma, unsigned long address) { return -ENOMEM; } |
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/* |
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* look up the first VMA exactly that exactly matches addr * - should be called with mm->mmap_sem at least held readlocked */ static inline struct vm_area_struct *find_vma_exact(struct mm_struct *mm, unsigned long addr) { struct vm_list_struct *vml; /* search the vm_start ordered list */ for (vml = mm->context.vmlist; vml; vml = vml->next) { if (vml->vma->vm_start == addr) return vml->vma; if (vml->vma->vm_start > addr) break; } return NULL; } /* |
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* find a VMA in the global tree */ |
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static inline struct vm_area_struct *find_nommu_vma(unsigned long start) { struct vm_area_struct *vma; struct rb_node *n = nommu_vma_tree.rb_node; while (n) { vma = rb_entry(n, struct vm_area_struct, vm_rb); if (start < vma->vm_start) n = n->rb_left; else if (start > vma->vm_start) n = n->rb_right; else return vma; } return NULL; } |
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/* * add a VMA in the global tree */ |
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static void add_nommu_vma(struct vm_area_struct *vma) { struct vm_area_struct *pvma; struct address_space *mapping; struct rb_node **p = &nommu_vma_tree.rb_node; struct rb_node *parent = NULL; /* add the VMA to the mapping */ if (vma->vm_file) { mapping = vma->vm_file->f_mapping; flush_dcache_mmap_lock(mapping); vma_prio_tree_insert(vma, &mapping->i_mmap); flush_dcache_mmap_unlock(mapping); } /* add the VMA to the master list */ while (*p) { parent = *p; pvma = rb_entry(parent, struct vm_area_struct, vm_rb); if (vma->vm_start < pvma->vm_start) { p = &(*p)->rb_left; } else if (vma->vm_start > pvma->vm_start) { p = &(*p)->rb_right; } else { /* mappings are at the same address - this can only * happen for shared-mem chardevs and shared file * mappings backed by ramfs/tmpfs */ BUG_ON(!(pvma->vm_flags & VM_SHARED)); if (vma < pvma) p = &(*p)->rb_left; else if (vma > pvma) p = &(*p)->rb_right; else BUG(); } } rb_link_node(&vma->vm_rb, parent, p); rb_insert_color(&vma->vm_rb, &nommu_vma_tree); } |
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/* * delete a VMA from the global list */ |
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static void delete_nommu_vma(struct vm_area_struct *vma) { struct address_space *mapping; /* remove the VMA from the mapping */ if (vma->vm_file) { mapping = vma->vm_file->f_mapping; flush_dcache_mmap_lock(mapping); vma_prio_tree_remove(vma, &mapping->i_mmap); flush_dcache_mmap_unlock(mapping); } /* remove from the master list */ rb_erase(&vma->vm_rb, &nommu_vma_tree); } /* * determine whether a mapping should be permitted and, if so, what sort of * mapping we're capable of supporting */ static int validate_mmap_request(struct file *file, unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, unsigned long pgoff, unsigned long *_capabilities) { unsigned long capabilities; unsigned long reqprot = prot; int ret; /* do the simple checks first */ if (flags & MAP_FIXED || addr) { printk(KERN_DEBUG "%d: Can't do fixed-address/overlay mmap of RAM ", current->pid); return -EINVAL; } if ((flags & MAP_TYPE) != MAP_PRIVATE && (flags & MAP_TYPE) != MAP_SHARED) return -EINVAL; |
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if (!len) |
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return -EINVAL; |
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/* Careful about overflows.. */ len = PAGE_ALIGN(len); if (!len || len > TASK_SIZE) return -ENOMEM; |
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/* offset overflow? */ if ((pgoff + (len >> PAGE_SHIFT)) < pgoff) |
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return -EOVERFLOW; |
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if (file) { /* validate file mapping requests */ struct address_space *mapping; /* files must support mmap */ if (!file->f_op || !file->f_op->mmap) return -ENODEV; /* work out if what we've got could possibly be shared * - we support chardevs that provide their own "memory" * - we support files/blockdevs that are memory backed */ mapping = file->f_mapping; if (!mapping) |
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mapping = file->f_path.dentry->d_inode->i_mapping; |
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capabilities = 0; if (mapping && mapping->backing_dev_info) capabilities = mapping->backing_dev_info->capabilities; if (!capabilities) { /* no explicit capabilities set, so assume some * defaults */ |
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switch (file->f_path.dentry->d_inode->i_mode & S_IFMT) { |
1da177e4c Linux-2.6.12-rc2 |
633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 |
case S_IFREG: case S_IFBLK: capabilities = BDI_CAP_MAP_COPY; break; case S_IFCHR: capabilities = BDI_CAP_MAP_DIRECT | BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP; break; default: return -EINVAL; } } /* eliminate any capabilities that we can't support on this * device */ if (!file->f_op->get_unmapped_area) capabilities &= ~BDI_CAP_MAP_DIRECT; if (!file->f_op->read) capabilities &= ~BDI_CAP_MAP_COPY; if (flags & MAP_SHARED) { /* do checks for writing, appending and locking */ if ((prot & PROT_WRITE) && !(file->f_mode & FMODE_WRITE)) return -EACCES; |
e9536ae72 [PATCH] struct pa... |
662 |
if (IS_APPEND(file->f_path.dentry->d_inode) && |
1da177e4c Linux-2.6.12-rc2 |
663 664 |
(file->f_mode & FMODE_WRITE)) return -EACCES; |
e9536ae72 [PATCH] struct pa... |
665 |
if (locks_verify_locked(file->f_path.dentry->d_inode)) |
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 |
return -EAGAIN; if (!(capabilities & BDI_CAP_MAP_DIRECT)) return -ENODEV; if (((prot & PROT_READ) && !(capabilities & BDI_CAP_READ_MAP)) || ((prot & PROT_WRITE) && !(capabilities & BDI_CAP_WRITE_MAP)) || ((prot & PROT_EXEC) && !(capabilities & BDI_CAP_EXEC_MAP)) ) { printk("MAP_SHARED not completely supported on !MMU "); return -EINVAL; } /* we mustn't privatise shared mappings */ capabilities &= ~BDI_CAP_MAP_COPY; } else { /* we're going to read the file into private memory we * allocate */ if (!(capabilities & BDI_CAP_MAP_COPY)) return -ENODEV; /* we don't permit a private writable mapping to be * shared with the backing device */ if (prot & PROT_WRITE) capabilities &= ~BDI_CAP_MAP_DIRECT; } /* handle executable mappings and implied executable * mappings */ |
e9536ae72 [PATCH] struct pa... |
697 |
if (file->f_path.mnt->mnt_flags & MNT_NOEXEC) { |
1da177e4c Linux-2.6.12-rc2 |
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 |
if (prot & PROT_EXEC) return -EPERM; } else if ((prot & PROT_READ) && !(prot & PROT_EXEC)) { /* handle implication of PROT_EXEC by PROT_READ */ if (current->personality & READ_IMPLIES_EXEC) { if (capabilities & BDI_CAP_EXEC_MAP) prot |= PROT_EXEC; } } else if ((prot & PROT_READ) && (prot & PROT_EXEC) && !(capabilities & BDI_CAP_EXEC_MAP) ) { /* backing file is not executable, try to copy */ capabilities &= ~BDI_CAP_MAP_DIRECT; } } else { /* anonymous mappings are always memory backed and can be * privately mapped */ capabilities = BDI_CAP_MAP_COPY; /* handle PROT_EXEC implication by PROT_READ */ if ((prot & PROT_READ) && (current->personality & READ_IMPLIES_EXEC)) prot |= PROT_EXEC; } /* allow the security API to have its say */ |
ed0321895 security: Protect... |
729 |
ret = security_file_mmap(file, reqprot, prot, flags, addr, 0); |
1da177e4c Linux-2.6.12-rc2 |
730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 |
if (ret < 0) return ret; /* looks okay */ *_capabilities = capabilities; return 0; } /* * we've determined that we can make the mapping, now translate what we * now know into VMA flags */ static unsigned long determine_vm_flags(struct file *file, unsigned long prot, unsigned long flags, unsigned long capabilities) { unsigned long vm_flags; vm_flags = calc_vm_prot_bits(prot) | calc_vm_flag_bits(flags); vm_flags |= VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC; /* vm_flags |= mm->def_flags; */ if (!(capabilities & BDI_CAP_MAP_DIRECT)) { /* attempt to share read-only copies of mapped file chunks */ if (file && !(prot & PROT_WRITE)) vm_flags |= VM_MAYSHARE; } else { /* overlay a shareable mapping on the backing device or inode * if possible - used for chardevs, ramfs/tmpfs/shmfs and * romfs/cramfs */ if (flags & MAP_SHARED) vm_flags |= VM_MAYSHARE | VM_SHARED; else if ((((vm_flags & capabilities) ^ vm_flags) & BDI_CAP_VMFLAGS) == 0) vm_flags |= VM_MAYSHARE; } /* refuse to let anyone share private mappings with this process if * it's being traced - otherwise breakpoints set in it may interfere * with another untraced process */ |
fa8e26ccd tracehook: traceh... |
772 |
if ((flags & MAP_PRIVATE) && tracehook_expect_breakpoints(current)) |
1da177e4c Linux-2.6.12-rc2 |
773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 |
vm_flags &= ~VM_MAYSHARE; return vm_flags; } /* * set up a shared mapping on a file */ static int do_mmap_shared_file(struct vm_area_struct *vma, unsigned long len) { int ret; ret = vma->vm_file->f_op->mmap(vma->vm_file, vma); if (ret != -ENOSYS) return ret; /* getting an ENOSYS error indicates that direct mmap isn't * possible (as opposed to tried but failed) so we'll fall * through to making a private copy of the data and mapping * that if we can */ return -ENODEV; } /* * set up a private mapping or an anonymous shared mapping */ static int do_mmap_private(struct vm_area_struct *vma, unsigned long len) { void *base; int ret; /* invoke the file's mapping function so that it can keep track of * shared mappings on devices or memory * - VM_MAYSHARE will be set if it may attempt to share */ if (vma->vm_file) { ret = vma->vm_file->f_op->mmap(vma->vm_file, vma); if (ret != -ENOSYS) { /* shouldn't return success if we're not sharing */ BUG_ON(ret == 0 && !(vma->vm_flags & VM_MAYSHARE)); return ret; /* success or a real error */ } /* getting an ENOSYS error indicates that direct mmap isn't * possible (as opposed to tried but failed) so we'll try to * make a private copy of the data and map that instead */ } /* allocate some memory to hold the mapping * - note that this may not return a page-aligned address if the object * we're allocating is smaller than a page */ |
84097518d [PATCH] mm: nommu... |
825 |
base = kmalloc(len, GFP_KERNEL|__GFP_COMP); |
1da177e4c Linux-2.6.12-rc2 |
826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 |
if (!base) goto enomem; vma->vm_start = (unsigned long) base; vma->vm_end = vma->vm_start + len; vma->vm_flags |= VM_MAPPED_COPY; #ifdef WARN_ON_SLACK if (len + WARN_ON_SLACK <= kobjsize(result)) printk("Allocation of %lu bytes from process %d has %lu bytes of slack ", len, current->pid, kobjsize(result) - len); #endif if (vma->vm_file) { /* read the contents of a file into the copy */ mm_segment_t old_fs; loff_t fpos; fpos = vma->vm_pgoff; fpos <<= PAGE_SHIFT; old_fs = get_fs(); set_fs(KERNEL_DS); ret = vma->vm_file->f_op->read(vma->vm_file, base, len, &fpos); set_fs(old_fs); if (ret < 0) goto error_free; /* clear the last little bit */ if (ret < len) memset(base + ret, 0, len - ret); } else { /* if it's an anonymous mapping, then just clear it */ memset(base, 0, len); } return 0; error_free: kfree(base); vma->vm_start = 0; return ret; enomem: printk("Allocation of length %lu from process %d failed ", len, current->pid); show_free_areas(); return -ENOMEM; } /* * handle mapping creation for uClinux */ unsigned long do_mmap_pgoff(struct file *file, unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, unsigned long pgoff) { struct vm_list_struct *vml = NULL; struct vm_area_struct *vma = NULL; struct rb_node *rb; unsigned long capabilities, vm_flags; void *result; int ret; |
7cd94146c Security: round m... |
896 897 |
if (!(flags & MAP_FIXED)) addr = round_hint_to_min(addr); |
1da177e4c Linux-2.6.12-rc2 |
898 899 900 901 902 903 904 905 906 907 908 909 |
/* decide whether we should attempt the mapping, and if so what sort of * mapping */ ret = validate_mmap_request(file, addr, len, prot, flags, pgoff, &capabilities); if (ret < 0) return ret; /* we've determined that we can make the mapping, now translate what we * now know into VMA flags */ vm_flags = determine_vm_flags(file, prot, flags, capabilities); /* we're going to need to record the mapping if it works */ |
4668edc33 [PATCH] kernel co... |
910 |
vml = kzalloc(sizeof(struct vm_list_struct), GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
911 912 |
if (!vml) goto error_getting_vml; |
1da177e4c Linux-2.6.12-rc2 |
913 914 915 916 917 918 919 920 921 922 923 924 925 926 |
down_write(&nommu_vma_sem); /* if we want to share, we need to check for VMAs created by other * mmap() calls that overlap with our proposed mapping * - we can only share with an exact match on most regular files * - shared mappings on character devices and memory backed files are * permitted to overlap inexactly as far as we are concerned for in * these cases, sharing is handled in the driver or filesystem rather * than here */ if (vm_flags & VM_MAYSHARE) { unsigned long pglen = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; unsigned long vmpglen; |
165b23927 [PATCH] NOMMU: ma... |
927 928 929 930 |
/* suppress VMA sharing for shared regions */ if (vm_flags & VM_SHARED && capabilities & BDI_CAP_MAP_DIRECT) goto dont_share_VMAs; |
1da177e4c Linux-2.6.12-rc2 |
931 932 933 934 935 936 937 |
for (rb = rb_first(&nommu_vma_tree); rb; rb = rb_next(rb)) { vma = rb_entry(rb, struct vm_area_struct, vm_rb); if (!(vma->vm_flags & VM_MAYSHARE)) continue; /* search for overlapping mappings on the same file */ |
e9536ae72 [PATCH] struct pa... |
938 |
if (vma->vm_file->f_path.dentry->d_inode != file->f_path.dentry->d_inode) |
1da177e4c Linux-2.6.12-rc2 |
939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 |
continue; if (vma->vm_pgoff >= pgoff + pglen) continue; vmpglen = vma->vm_end - vma->vm_start + PAGE_SIZE - 1; vmpglen >>= PAGE_SHIFT; if (pgoff >= vma->vm_pgoff + vmpglen) continue; /* handle inexactly overlapping matches between mappings */ if (vma->vm_pgoff != pgoff || vmpglen != pglen) { if (!(capabilities & BDI_CAP_MAP_DIRECT)) goto sharing_violation; continue; } /* we've found a VMA we can share */ atomic_inc(&vma->vm_usage); vml->vma = vma; result = (void *) vma->vm_start; goto shared; } |
165b23927 [PATCH] NOMMU: ma... |
963 |
dont_share_VMAs: |
1da177e4c Linux-2.6.12-rc2 |
964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 |
vma = NULL; /* obtain the address at which to make a shared mapping * - this is the hook for quasi-memory character devices to * tell us the location of a shared mapping */ if (file && file->f_op->get_unmapped_area) { addr = file->f_op->get_unmapped_area(file, addr, len, pgoff, flags); if (IS_ERR((void *) addr)) { ret = addr; if (ret != (unsigned long) -ENOSYS) goto error; /* the driver refused to tell us where to site * the mapping so we'll have to attempt to copy * it */ ret = (unsigned long) -ENODEV; if (!(capabilities & BDI_CAP_MAP_COPY)) goto error; capabilities &= ~BDI_CAP_MAP_DIRECT; } } } /* we're going to need a VMA struct as well */ |
4668edc33 [PATCH] kernel co... |
991 |
vma = kzalloc(sizeof(struct vm_area_struct), GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
992 993 |
if (!vma) goto error_getting_vma; |
1da177e4c Linux-2.6.12-rc2 |
994 995 |
INIT_LIST_HEAD(&vma->anon_vma_node); atomic_set(&vma->vm_usage, 1); |
925d1c401 procfs task exe s... |
996 |
if (file) { |
1da177e4c Linux-2.6.12-rc2 |
997 |
get_file(file); |
925d1c401 procfs task exe s... |
998 999 1000 1001 1002 |
if (vm_flags & VM_EXECUTABLE) { added_exe_file_vma(current->mm); vma->vm_mm = current->mm; } } |
1da177e4c Linux-2.6.12-rc2 |
1003 1004 1005 1006 1007 1008 1009 1010 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 |
vma->vm_file = file; vma->vm_flags = vm_flags; vma->vm_start = addr; vma->vm_end = addr + len; vma->vm_pgoff = pgoff; vml->vma = vma; /* set up the mapping */ if (file && vma->vm_flags & VM_SHARED) ret = do_mmap_shared_file(vma, len); else ret = do_mmap_private(vma, len); if (ret < 0) goto error; /* okay... we have a mapping; now we have to register it */ result = (void *) vma->vm_start; if (vma->vm_flags & VM_MAPPED_COPY) { realalloc += kobjsize(result); askedalloc += len; } realalloc += kobjsize(vma); askedalloc += sizeof(*vma); current->mm->total_vm += len >> PAGE_SHIFT; add_nommu_vma(vma); shared: realalloc += kobjsize(vml); askedalloc += sizeof(*vml); |
3034097a5 [PATCH] NOMMU: Or... |
1037 |
add_vma_to_mm(current->mm, vml); |
1da177e4c Linux-2.6.12-rc2 |
1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 |
up_write(&nommu_vma_sem); if (prot & PROT_EXEC) flush_icache_range((unsigned long) result, (unsigned long) result + len); #ifdef DEBUG printk("do_mmap: "); show_process_blocks(); #endif return (unsigned long) result; error: up_write(&nommu_vma_sem); kfree(vml); if (vma) { |
925d1c401 procfs task exe s... |
1057 |
if (vma->vm_file) { |
3fcd03e07 [PATCH] NOMMU: do... |
1058 |
fput(vma->vm_file); |
925d1c401 procfs task exe s... |
1059 1060 1061 |
if (vma->vm_flags & VM_EXECUTABLE) removed_exe_file_vma(vma->vm_mm); } |
1da177e4c Linux-2.6.12-rc2 |
1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 |
kfree(vma); } return ret; sharing_violation: up_write(&nommu_vma_sem); printk("Attempt to share mismatched mappings "); kfree(vml); return -EINVAL; error_getting_vma: up_write(&nommu_vma_sem); kfree(vml); |
66aa2b4b1 [PATCH] uclinux: ... |
1076 1077 |
printk("Allocation of vma for %lu byte allocation from process %d failed ", |
1da177e4c Linux-2.6.12-rc2 |
1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 |
len, current->pid); show_free_areas(); return -ENOMEM; error_getting_vml: printk("Allocation of vml for %lu byte allocation from process %d failed ", len, current->pid); show_free_areas(); return -ENOMEM; } |
b50731732 nommu: vmalloc_32... |
1089 |
EXPORT_SYMBOL(do_mmap_pgoff); |
1da177e4c Linux-2.6.12-rc2 |
1090 1091 1092 1093 |
/* * handle mapping disposal for uClinux */ |
925d1c401 procfs task exe s... |
1094 |
static void put_vma(struct mm_struct *mm, struct vm_area_struct *vma) |
1da177e4c Linux-2.6.12-rc2 |
1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 |
{ if (vma) { down_write(&nommu_vma_sem); if (atomic_dec_and_test(&vma->vm_usage)) { delete_nommu_vma(vma); if (vma->vm_ops && vma->vm_ops->close) vma->vm_ops->close(vma); /* IO memory and memory shared directly out of the pagecache from * ramfs/tmpfs mustn't be released here */ if (vma->vm_flags & VM_MAPPED_COPY) { realalloc -= kobjsize((void *) vma->vm_start); askedalloc -= vma->vm_end - vma->vm_start; kfree((void *) vma->vm_start); } realalloc -= kobjsize(vma); askedalloc -= sizeof(*vma); |
925d1c401 procfs task exe s... |
1115 |
if (vma->vm_file) { |
1da177e4c Linux-2.6.12-rc2 |
1116 |
fput(vma->vm_file); |
925d1c401 procfs task exe s... |
1117 1118 1119 |
if (vma->vm_flags & VM_EXECUTABLE) removed_exe_file_vma(mm); } |
1da177e4c Linux-2.6.12-rc2 |
1120 1121 1122 1123 1124 1125 |
kfree(vma); } up_write(&nommu_vma_sem); } } |
3034097a5 [PATCH] NOMMU: Or... |
1126 1127 1128 1129 1130 |
/* * release a mapping * - under NOMMU conditions the parameters must match exactly to the mapping to * be removed */ |
1da177e4c Linux-2.6.12-rc2 |
1131 1132 1133 1134 1135 1136 1137 1138 1139 |
int do_munmap(struct mm_struct *mm, unsigned long addr, size_t len) { struct vm_list_struct *vml, **parent; unsigned long end = addr + len; #ifdef DEBUG printk("do_munmap: "); #endif |
3034097a5 [PATCH] NOMMU: Or... |
1140 1141 1142 |
for (parent = &mm->context.vmlist; *parent; parent = &(*parent)->next) { if ((*parent)->vma->vm_start > addr) break; |
1da177e4c Linux-2.6.12-rc2 |
1143 |
if ((*parent)->vma->vm_start == addr && |
66aa2b4b1 [PATCH] uclinux: ... |
1144 |
((len == 0) || ((*parent)->vma->vm_end == end))) |
1da177e4c Linux-2.6.12-rc2 |
1145 |
goto found; |
3034097a5 [PATCH] NOMMU: Or... |
1146 |
} |
1da177e4c Linux-2.6.12-rc2 |
1147 1148 1149 1150 1151 1152 1153 1154 |
printk("munmap of non-mmaped memory by process %d (%s): %p ", current->pid, current->comm, (void *) addr); return -EINVAL; found: vml = *parent; |
925d1c401 procfs task exe s... |
1155 |
put_vma(mm, vml->vma); |
1da177e4c Linux-2.6.12-rc2 |
1156 1157 1158 1159 1160 |
*parent = vml->next; realalloc -= kobjsize(vml); askedalloc -= sizeof(*vml); kfree(vml); |
365e9c87a [PATCH] mm: updat... |
1161 1162 |
update_hiwater_vm(mm); |
1da177e4c Linux-2.6.12-rc2 |
1163 1164 1165 1166 1167 1168 1169 1170 |
mm->total_vm -= len >> PAGE_SHIFT; #ifdef DEBUG show_process_blocks(); #endif return 0; } |
b50731732 nommu: vmalloc_32... |
1171 |
EXPORT_SYMBOL(do_munmap); |
1da177e4c Linux-2.6.12-rc2 |
1172 |
|
3034097a5 [PATCH] NOMMU: Or... |
1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 |
asmlinkage long sys_munmap(unsigned long addr, size_t len) { int ret; struct mm_struct *mm = current->mm; down_write(&mm->mmap_sem); ret = do_munmap(mm, addr, len); up_write(&mm->mmap_sem); return ret; } /* * Release all mappings */ |
1da177e4c Linux-2.6.12-rc2 |
1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 |
void exit_mmap(struct mm_struct * mm) { struct vm_list_struct *tmp; if (mm) { #ifdef DEBUG printk("Exit_mmap: "); #endif mm->total_vm = 0; while ((tmp = mm->context.vmlist)) { mm->context.vmlist = tmp->next; |
925d1c401 procfs task exe s... |
1201 |
put_vma(mm, tmp->vma); |
1da177e4c Linux-2.6.12-rc2 |
1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 |
realalloc -= kobjsize(tmp); askedalloc -= sizeof(*tmp); kfree(tmp); } #ifdef DEBUG show_process_blocks(); #endif } } |
1da177e4c Linux-2.6.12-rc2 |
1213 1214 1215 1216 1217 1218 |
unsigned long do_brk(unsigned long addr, unsigned long len) { return -ENOMEM; } /* |
6fa5f80bc [PATCH] NOMMU: Ma... |
1219 1220 |
* expand (or shrink) an existing mapping, potentially moving it at the same * time (controlled by the MREMAP_MAYMOVE flag and available VM space) |
1da177e4c Linux-2.6.12-rc2 |
1221 |
* |
6fa5f80bc [PATCH] NOMMU: Ma... |
1222 1223 1224 |
* under NOMMU conditions, we only permit changing a mapping's size, and only * as long as it stays within the hole allocated by the kmalloc() call in * do_mmap_pgoff() and the block is not shareable |
1da177e4c Linux-2.6.12-rc2 |
1225 |
* |
6fa5f80bc [PATCH] NOMMU: Ma... |
1226 |
* MREMAP_FIXED is not supported under NOMMU conditions |
1da177e4c Linux-2.6.12-rc2 |
1227 1228 1229 1230 1231 |
*/ unsigned long do_mremap(unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long flags, unsigned long new_addr) { |
6fa5f80bc [PATCH] NOMMU: Ma... |
1232 |
struct vm_area_struct *vma; |
1da177e4c Linux-2.6.12-rc2 |
1233 1234 1235 1236 1237 1238 1239 |
/* insanity checks first */ if (new_len == 0) return (unsigned long) -EINVAL; if (flags & MREMAP_FIXED && new_addr != addr) return (unsigned long) -EINVAL; |
6fa5f80bc [PATCH] NOMMU: Ma... |
1240 1241 1242 |
vma = find_vma_exact(current->mm, addr); if (!vma) return (unsigned long) -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
1243 |
|
6fa5f80bc [PATCH] NOMMU: Ma... |
1244 |
if (vma->vm_end != vma->vm_start + old_len) |
1da177e4c Linux-2.6.12-rc2 |
1245 |
return (unsigned long) -EFAULT; |
6fa5f80bc [PATCH] NOMMU: Ma... |
1246 |
if (vma->vm_flags & VM_MAYSHARE) |
1da177e4c Linux-2.6.12-rc2 |
1247 1248 1249 1250 1251 1252 |
return (unsigned long) -EPERM; if (new_len > kobjsize((void *) addr)) return (unsigned long) -ENOMEM; /* all checks complete - do it */ |
6fa5f80bc [PATCH] NOMMU: Ma... |
1253 |
vma->vm_end = vma->vm_start + new_len; |
1da177e4c Linux-2.6.12-rc2 |
1254 1255 1256 |
askedalloc -= old_len; askedalloc += new_len; |
6fa5f80bc [PATCH] NOMMU: Ma... |
1257 1258 |
return vma->vm_start; } |
b50731732 nommu: vmalloc_32... |
1259 |
EXPORT_SYMBOL(do_mremap); |
6fa5f80bc [PATCH] NOMMU: Ma... |
1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 |
asmlinkage unsigned long sys_mremap(unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long flags, unsigned long new_addr) { unsigned long ret; down_write(¤t->mm->mmap_sem); ret = do_mremap(addr, old_len, new_len, flags, new_addr); up_write(¤t->mm->mmap_sem); return ret; |
1da177e4c Linux-2.6.12-rc2 |
1271 |
} |
6aab341e0 mm: re-architect ... |
1272 |
struct page *follow_page(struct vm_area_struct *vma, unsigned long address, |
deceb6cd1 [PATCH] mm: follo... |
1273 |
unsigned int foll_flags) |
1da177e4c Linux-2.6.12-rc2 |
1274 1275 1276 |
{ return NULL; } |
1da177e4c Linux-2.6.12-rc2 |
1277 1278 1279 |
int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long to, unsigned long size, pgprot_t prot) { |
66aa2b4b1 [PATCH] uclinux: ... |
1280 1281 |
vma->vm_start = vma->vm_pgoff << PAGE_SHIFT; return 0; |
1da177e4c Linux-2.6.12-rc2 |
1282 |
} |
22c4af409 [PATCH] nommu: ex... |
1283 |
EXPORT_SYMBOL(remap_pfn_range); |
1da177e4c Linux-2.6.12-rc2 |
1284 |
|
f905bc447 nommu: add new vm... |
1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 |
int remap_vmalloc_range(struct vm_area_struct *vma, void *addr, unsigned long pgoff) { unsigned int size = vma->vm_end - vma->vm_start; if (!(vma->vm_flags & VM_USERMAP)) return -EINVAL; vma->vm_start = (unsigned long)(addr + (pgoff << PAGE_SHIFT)); vma->vm_end = vma->vm_start + size; return 0; } EXPORT_SYMBOL(remap_vmalloc_range); |
1da177e4c Linux-2.6.12-rc2 |
1299 1300 1301 1302 1303 1304 1305 1306 1307 |
void swap_unplug_io_fn(struct backing_dev_info *bdi, struct page *page) { } unsigned long arch_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) { return -ENOMEM; } |
1363c3cd8 [PATCH] Avoiding ... |
1308 |
void arch_unmap_area(struct mm_struct *mm, unsigned long addr) |
1da177e4c Linux-2.6.12-rc2 |
1309 1310 |
{ } |
1da177e4c Linux-2.6.12-rc2 |
1311 1312 1313 1314 1315 |
void unmap_mapping_range(struct address_space *mapping, loff_t const holebegin, loff_t const holelen, int even_cows) { } |
22c4af409 [PATCH] nommu: ex... |
1316 |
EXPORT_SYMBOL(unmap_mapping_range); |
1da177e4c Linux-2.6.12-rc2 |
1317 1318 |
/* |
d56e03cd2 [PATCH] NOMMU: su... |
1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 |
* ask for an unmapped area at which to create a mapping on a file */ unsigned long get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) { unsigned long (*get_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); 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; if (!get_area) return -ENOSYS; return get_area(file, addr, len, pgoff, flags); } |
d56e03cd2 [PATCH] NOMMU: su... |
1337 1338 1339 |
EXPORT_SYMBOL(get_unmapped_area); /* |
1da177e4c Linux-2.6.12-rc2 |
1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 |
* 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. */ |
34b4e4aa3 fix NULL pointer ... |
1355 |
int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin) |
1da177e4c Linux-2.6.12-rc2 |
1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 |
{ 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; |
347ce434d [PATCH] zoned vm ... |
1369 |
free = global_page_state(NR_FILE_PAGES); |
1da177e4c Linux-2.6.12-rc2 |
1370 1371 1372 1373 1374 1375 1376 1377 |
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 */ |
972d1a7b1 [PATCH] ZVC: Supp... |
1378 |
free += global_page_state(NR_SLAB_RECLAIMABLE); |
1da177e4c Linux-2.6.12-rc2 |
1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 |
/* * 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(); |
d5ddc79bc [PATCH] overcommi... |
1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 |
/* * 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 */ |
1da177e4c Linux-2.6.12-rc2 |
1406 1407 1408 1409 1410 1411 |
if (!cap_sys_admin) n -= n / 32; free += n; if (free > pages) return 0; |
d5ddc79bc [PATCH] overcommi... |
1412 1413 |
goto error; |
1da177e4c Linux-2.6.12-rc2 |
1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 |
} allowed = totalram_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 */ |
731572d39 nfsd: fix vm over... |
1426 1427 |
if (mm) allowed -= mm->total_vm / 32; |
1da177e4c Linux-2.6.12-rc2 |
1428 |
|
2f60f8d35 [PATCH] __vm_enou... |
1429 1430 1431 1432 |
/* * cast `allowed' as a signed long because vm_committed_space * sometimes has a negative value */ |
80119ef5c mm: fix atomic_t ... |
1433 |
if (atomic_long_read(&vm_committed_space) < (long)allowed) |
1da177e4c Linux-2.6.12-rc2 |
1434 |
return 0; |
d5ddc79bc [PATCH] overcommi... |
1435 |
error: |
1da177e4c Linux-2.6.12-rc2 |
1436 1437 1438 1439 1440 1441 1442 1443 1444 |
vm_unacct_memory(pages); return -ENOMEM; } int in_gate_area_no_task(unsigned long addr) { return 0; } |
b0e15190e [PATCH] NOMMU: Ma... |
1445 |
|
d0217ac04 mm: fault feedbac... |
1446 |
int filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
b0e15190e [PATCH] NOMMU: Ma... |
1447 1448 |
{ BUG(); |
d0217ac04 mm: fault feedbac... |
1449 |
return 0; |
b0e15190e [PATCH] NOMMU: Ma... |
1450 |
} |
b50731732 nommu: vmalloc_32... |
1451 |
EXPORT_SYMBOL(filemap_fault); |
0ec76a110 [PATCH] NOMMU: Ch... |
1452 1453 1454 1455 1456 1457 1458 |
/* * Access another process' address space. * - source/target buffer must be kernel space */ int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write) { |
0ec76a110 [PATCH] NOMMU: Ch... |
1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 |
struct vm_area_struct *vma; struct mm_struct *mm; if (addr + len < addr) return 0; mm = get_task_mm(tsk); if (!mm) return 0; down_read(&mm->mmap_sem); /* the access must start within one of the target process's mappings */ |
0159b141d [PATCH] NOMMU: Us... |
1472 1473 |
vma = find_vma(mm, addr); if (vma) { |
0ec76a110 [PATCH] NOMMU: Ch... |
1474 1475 1476 1477 1478 |
/* don't overrun this mapping */ if (addr + len >= vma->vm_end) len = vma->vm_end - addr; /* only read or write mappings where it is permitted */ |
d00c7b993 [PATCH] NOMMU: Pe... |
1479 |
if (write && vma->vm_flags & VM_MAYWRITE) |
0ec76a110 [PATCH] NOMMU: Ch... |
1480 |
len -= copy_to_user((void *) addr, buf, len); |
d00c7b993 [PATCH] NOMMU: Pe... |
1481 |
else if (!write && vma->vm_flags & VM_MAYREAD) |
0ec76a110 [PATCH] NOMMU: Ch... |
1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 |
len -= copy_from_user(buf, (void *) addr, len); else len = 0; } else { len = 0; } up_read(&mm->mmap_sem); mmput(mm); return len; } |