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mm/nommu.c
53.7 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 * |
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* Copyright (c) 2004-2008 David Howells <dhowells@redhat.com> |
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* 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) 2007-2010 Paul Mundt <lethal@linux-sh.org> |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/export.h> |
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#include <linux/mm.h> |
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#include <linux/vmacache.h> |
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#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/blkdev.h> #include <linux/backing-dev.h> |
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#include <linux/compiler.h> |
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#include <linux/mount.h> #include <linux/personality.h> #include <linux/security.h> #include <linux/syscalls.h> |
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#include <linux/audit.h> |
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#include <linux/sched/sysctl.h> |
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#include <linux/printk.h> |
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#include <asm/uaccess.h> #include <asm/tlb.h> #include <asm/tlbflush.h> |
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#include <asm/mmu_context.h> |
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#include "internal.h" |
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#if 0 #define kenter(FMT, ...) \ printk(KERN_DEBUG "==> %s("FMT") ", __func__, ##__VA_ARGS__) #define kleave(FMT, ...) \ printk(KERN_DEBUG "<== %s()"FMT" ", __func__, ##__VA_ARGS__) #define kdebug(FMT, ...) \ printk(KERN_DEBUG "xxx" FMT"yyy ", ##__VA_ARGS__) #else #define kenter(FMT, ...) \ no_printk(KERN_DEBUG "==> %s("FMT") ", __func__, ##__VA_ARGS__) #define kleave(FMT, ...) \ no_printk(KERN_DEBUG "<== %s()"FMT" ", __func__, ##__VA_ARGS__) #define kdebug(FMT, ...) \ no_printk(KERN_DEBUG FMT" ", ##__VA_ARGS__) #endif |
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void *high_memory; |
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EXPORT_SYMBOL(high_memory); |
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struct page *mem_map; unsigned long max_mapnr; |
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EXPORT_SYMBOL(max_mapnr); |
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unsigned long highest_memmap_pfn; |
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struct percpu_counter vm_committed_as; |
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int sysctl_overcommit_memory = OVERCOMMIT_GUESS; /* heuristic overcommit */ int sysctl_overcommit_ratio = 50; /* default is 50% */ |
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unsigned long sysctl_overcommit_kbytes __read_mostly; |
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int sysctl_max_map_count = DEFAULT_MAX_MAP_COUNT; |
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int sysctl_nr_trim_pages = CONFIG_NOMMU_INITIAL_TRIM_EXCESS; |
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unsigned long sysctl_user_reserve_kbytes __read_mostly = 1UL << 17; /* 128MB */ |
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unsigned long sysctl_admin_reserve_kbytes __read_mostly = 1UL << 13; /* 8MB */ |
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int heap_stack_gap = 0; |
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atomic_long_t mmap_pages_allocated; |
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|
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/* * The global memory commitment made in the system can be a metric * that can be used to drive ballooning decisions when Linux is hosted * as a guest. On Hyper-V, the host implements a policy engine for dynamically * balancing memory across competing virtual machines that are hosted. * Several metrics drive this policy engine including the guest reported * memory commitment. */ unsigned long vm_memory_committed(void) { return percpu_counter_read_positive(&vm_committed_as); } EXPORT_SYMBOL_GPL(vm_memory_committed); |
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EXPORT_SYMBOL(mem_map); |
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|
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/* list of mapped, potentially shareable regions */ static struct kmem_cache *vm_region_jar; struct rb_root nommu_region_tree = RB_ROOT; DECLARE_RWSEM(nommu_region_sem); |
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|
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const struct vm_operations_struct generic_file_vm_ops = { |
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}; /* |
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* 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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/* |
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* If it's not a compound page, see if we have a matching VMA * region. This test is intentionally done in reverse order, * so if there's no VMA, we still fall through and hand back * PAGE_SIZE for 0-order pages. */ if (!PageCompound(page)) { struct vm_area_struct *vma; vma = find_vma(current->mm, (unsigned long)objp); if (vma) return vma->vm_end - vma->vm_start; } /* |
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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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long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm, unsigned long start, unsigned long nr_pages, unsigned int foll_flags, struct page **pages, struct vm_area_struct **vmas, int *nonblocking) |
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{ |
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struct vm_area_struct *vma; |
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unsigned long vm_flags; int i; /* calculate required read or write permissions. |
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* If FOLL_FORCE is set, we only require the "MAY" flags. |
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*/ |
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vm_flags = (foll_flags & FOLL_WRITE) ? (VM_WRITE | VM_MAYWRITE) : (VM_READ | VM_MAYREAD); vm_flags &= (foll_flags & FOLL_FORCE) ? (VM_MAYREAD | VM_MAYWRITE) : (VM_READ | VM_WRITE); |
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|
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for (i = 0; i < nr_pages; 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 */ |
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if ((vma->vm_flags & (VM_IO | VM_PFNMAP)) || !(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 = (start + PAGE_SIZE) & PAGE_MASK; |
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} |
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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 */ |
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long get_user_pages(struct task_struct *tsk, struct mm_struct *mm, unsigned long start, unsigned long nr_pages, int write, int force, struct page **pages, struct vm_area_struct **vmas) |
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{ int flags = 0; if (write) |
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flags |= FOLL_WRITE; |
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if (force) |
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flags |= FOLL_FORCE; |
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|
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return __get_user_pages(tsk, mm, start, nr_pages, flags, pages, vmas, NULL); |
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} |
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EXPORT_SYMBOL(get_user_pages); |
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long get_user_pages_locked(struct task_struct *tsk, struct mm_struct *mm, unsigned long start, unsigned long nr_pages, int write, int force, struct page **pages, int *locked) { return get_user_pages(tsk, mm, start, nr_pages, write, force, pages, NULL); } EXPORT_SYMBOL(get_user_pages_locked); |
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long __get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm, unsigned long start, unsigned long nr_pages, int write, int force, struct page **pages, unsigned int gup_flags) |
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{ long ret; down_read(&mm->mmap_sem); ret = get_user_pages(tsk, mm, start, nr_pages, write, force, pages, NULL); up_read(&mm->mmap_sem); return ret; } |
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EXPORT_SYMBOL(__get_user_pages_unlocked); long get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm, unsigned long start, unsigned long nr_pages, int write, int force, struct page **pages) { return __get_user_pages_unlocked(tsk, mm, start, nr_pages, write, force, pages, 0); } |
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EXPORT_SYMBOL(get_user_pages_unlocked); |
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/** * follow_pfn - look up PFN at a user virtual address * @vma: memory mapping * @address: user virtual address * @pfn: location to store found PFN * * Only IO mappings and raw PFN mappings are allowed. * * Returns zero and the pfn at @pfn on success, -ve otherwise. */ int follow_pfn(struct vm_area_struct *vma, unsigned long address, unsigned long *pfn) { if (!(vma->vm_flags & (VM_IO | VM_PFNMAP))) return -EINVAL; *pfn = address >> PAGE_SHIFT; return 0; } EXPORT_SYMBOL(follow_pfn); |
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LIST_HEAD(vmap_area_list); |
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|
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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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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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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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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) { |
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/* Don't allow overflow */ if ((unsigned long) buf + count < count) count = -(unsigned long) buf; |
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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); |
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return count; |
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} /* * 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); |
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/* * vzalloc - allocate virtually continguos memory with zero fill * * @size: allocation size * * Allocate enough pages to cover @size from the page level * allocator and map them into continguos kernel virtual space. * The memory allocated is set to zero. * * For tight control over page level allocator and protection flags * use __vmalloc() instead. */ void *vzalloc(unsigned long size) { return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL); } EXPORT_SYMBOL(vzalloc); /** * vmalloc_node - allocate memory on a specific node * @size: allocation size * @node: numa node * * Allocate enough pages to cover @size from the page level * allocator and map them into contiguous kernel virtual space. * * For tight control over page level allocator and protection flags * use __vmalloc() instead. */ |
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void *vmalloc_node(unsigned long size, int node) { return vmalloc(size); } |
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EXPORT_SYMBOL(vmalloc_node); |
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/** * vzalloc_node - allocate memory on a specific node with zero fill * @size: allocation size * @node: numa node * * Allocate enough pages to cover @size from the page level * allocator and map them into contiguous kernel virtual space. * The memory allocated is set to zero. * * For tight control over page level allocator and protection flags * use __vmalloc() instead. */ void *vzalloc_node(unsigned long size, int node) { return vzalloc(size); } EXPORT_SYMBOL(vzalloc_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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void vunmap(const void *addr) |
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{ BUG(); } |
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EXPORT_SYMBOL(vunmap); |
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void *vm_map_ram(struct page **pages, unsigned int count, int node, pgprot_t prot) { BUG(); return NULL; } EXPORT_SYMBOL(vm_map_ram); void vm_unmap_ram(const void *mem, unsigned int count) { BUG(); } EXPORT_SYMBOL(vm_unmap_ram); void vm_unmap_aliases(void) { } EXPORT_SYMBOL_GPL(vm_unmap_aliases); |
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/* |
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* Implement a stub for vmalloc_sync_all() if the architecture chose not to * have one. */ |
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void __weak vmalloc_sync_all(void) |
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{ } |
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/** * alloc_vm_area - allocate a range of kernel address space * @size: size of the area * * Returns: NULL on failure, vm_struct on success * * This function reserves a range of kernel address space, and * allocates pagetables to map that range. No actual mappings * are created. If the kernel address space is not shared * between processes, it syncs the pagetable across all * processes. */ |
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struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes) |
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{ BUG(); return NULL; } EXPORT_SYMBOL_GPL(alloc_vm_area); void free_vm_area(struct vm_struct *area) { BUG(); } EXPORT_SYMBOL_GPL(free_vm_area); |
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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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/* |
1da177e4c Linux-2.6.12-rc2 |
525 526 527 528 529 530 |
* 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. */ |
6a6160a7b [CVE-2009-0029] S... |
531 |
SYSCALL_DEFINE1(brk, unsigned long, brk) |
1da177e4c Linux-2.6.12-rc2 |
532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 |
{ 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. */ |
cfe79c00a NOMMU: Avoiding d... |
552 |
flush_icache_range(mm->brk, brk); |
1da177e4c Linux-2.6.12-rc2 |
553 554 |
return mm->brk = brk; } |
8feae1311 NOMMU: Make VMAs ... |
555 556 557 558 |
/* * initialise the VMA and region record slabs */ void __init mmap_init(void) |
1da177e4c Linux-2.6.12-rc2 |
559 |
{ |
00a62ce91 mm: fix Committed... |
560 |
int ret; |
908c7f194 percpu_counter: a... |
561 |
ret = percpu_counter_init(&vm_committed_as, 0, GFP_KERNEL); |
00a62ce91 mm: fix Committed... |
562 |
VM_BUG_ON(ret); |
33e5d7697 nommu: fix a numb... |
563 |
vm_region_jar = KMEM_CACHE(vm_region, SLAB_PANIC); |
1da177e4c Linux-2.6.12-rc2 |
564 |
} |
1da177e4c Linux-2.6.12-rc2 |
565 |
|
3034097a5 [PATCH] NOMMU: Or... |
566 |
/* |
8feae1311 NOMMU: Make VMAs ... |
567 568 |
* validate the region tree * - the caller must hold the region lock |
3034097a5 [PATCH] NOMMU: Or... |
569 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
570 571 |
#ifdef CONFIG_DEBUG_NOMMU_REGIONS static noinline void validate_nommu_regions(void) |
3034097a5 [PATCH] NOMMU: Or... |
572 |
{ |
8feae1311 NOMMU: Make VMAs ... |
573 574 |
struct vm_region *region, *last; struct rb_node *p, *lastp; |
3034097a5 [PATCH] NOMMU: Or... |
575 |
|
8feae1311 NOMMU: Make VMAs ... |
576 577 578 579 580 |
lastp = rb_first(&nommu_region_tree); if (!lastp) return; last = rb_entry(lastp, struct vm_region, vm_rb); |
33e5d7697 nommu: fix a numb... |
581 582 |
BUG_ON(unlikely(last->vm_end <= last->vm_start)); BUG_ON(unlikely(last->vm_top < last->vm_end)); |
8feae1311 NOMMU: Make VMAs ... |
583 584 585 586 |
while ((p = rb_next(lastp))) { region = rb_entry(p, struct vm_region, vm_rb); last = rb_entry(lastp, struct vm_region, vm_rb); |
33e5d7697 nommu: fix a numb... |
587 588 589 |
BUG_ON(unlikely(region->vm_end <= region->vm_start)); BUG_ON(unlikely(region->vm_top < region->vm_end)); BUG_ON(unlikely(region->vm_start < last->vm_top)); |
3034097a5 [PATCH] NOMMU: Or... |
590 |
|
8feae1311 NOMMU: Make VMAs ... |
591 592 |
lastp = p; } |
3034097a5 [PATCH] NOMMU: Or... |
593 |
} |
8feae1311 NOMMU: Make VMAs ... |
594 |
#else |
33e5d7697 nommu: fix a numb... |
595 596 597 |
static void validate_nommu_regions(void) { } |
8feae1311 NOMMU: Make VMAs ... |
598 |
#endif |
3034097a5 [PATCH] NOMMU: Or... |
599 600 |
/* |
8feae1311 NOMMU: Make VMAs ... |
601 |
* add a region into the global tree |
3034097a5 [PATCH] NOMMU: Or... |
602 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
603 |
static void add_nommu_region(struct vm_region *region) |
3034097a5 [PATCH] NOMMU: Or... |
604 |
{ |
8feae1311 NOMMU: Make VMAs ... |
605 606 |
struct vm_region *pregion; struct rb_node **p, *parent; |
3034097a5 [PATCH] NOMMU: Or... |
607 |
|
8feae1311 NOMMU: Make VMAs ... |
608 |
validate_nommu_regions(); |
8feae1311 NOMMU: Make VMAs ... |
609 610 611 612 613 614 615 616 617 618 619 620 621 |
parent = NULL; p = &nommu_region_tree.rb_node; while (*p) { parent = *p; pregion = rb_entry(parent, struct vm_region, vm_rb); if (region->vm_start < pregion->vm_start) p = &(*p)->rb_left; else if (region->vm_start > pregion->vm_start) p = &(*p)->rb_right; else if (pregion == region) return; else BUG(); |
3034097a5 [PATCH] NOMMU: Or... |
622 |
} |
8feae1311 NOMMU: Make VMAs ... |
623 624 |
rb_link_node(®ion->vm_rb, parent, p); rb_insert_color(®ion->vm_rb, &nommu_region_tree); |
3034097a5 [PATCH] NOMMU: Or... |
625 |
|
8feae1311 NOMMU: Make VMAs ... |
626 |
validate_nommu_regions(); |
3034097a5 [PATCH] NOMMU: Or... |
627 |
} |
3034097a5 [PATCH] NOMMU: Or... |
628 629 |
/* |
8feae1311 NOMMU: Make VMAs ... |
630 |
* delete a region from the global tree |
930e652a2 [PATCH] NOMMU: Ma... |
631 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
632 |
static void delete_nommu_region(struct vm_region *region) |
930e652a2 [PATCH] NOMMU: Ma... |
633 |
{ |
8feae1311 NOMMU: Make VMAs ... |
634 |
BUG_ON(!nommu_region_tree.rb_node); |
930e652a2 [PATCH] NOMMU: Ma... |
635 |
|
8feae1311 NOMMU: Make VMAs ... |
636 637 638 |
validate_nommu_regions(); rb_erase(®ion->vm_rb, &nommu_region_tree); validate_nommu_regions(); |
57c8f63e8 nommu: stub expan... |
639 |
} |
930e652a2 [PATCH] NOMMU: Ma... |
640 |
/* |
8feae1311 NOMMU: Make VMAs ... |
641 |
* free a contiguous series of pages |
6fa5f80bc [PATCH] NOMMU: Ma... |
642 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
643 |
static void free_page_series(unsigned long from, unsigned long to) |
6fa5f80bc [PATCH] NOMMU: Ma... |
644 |
{ |
8feae1311 NOMMU: Make VMAs ... |
645 646 647 648 |
for (; from < to; from += PAGE_SIZE) { struct page *page = virt_to_page(from); kdebug("- free %lx", from); |
33e5d7697 nommu: fix a numb... |
649 |
atomic_long_dec(&mmap_pages_allocated); |
8feae1311 NOMMU: Make VMAs ... |
650 |
if (page_count(page) != 1) |
33e5d7697 nommu: fix a numb... |
651 652 |
kdebug("free page %p: refcount not one: %d", page, page_count(page)); |
8feae1311 NOMMU: Make VMAs ... |
653 |
put_page(page); |
6fa5f80bc [PATCH] NOMMU: Ma... |
654 |
} |
6fa5f80bc [PATCH] NOMMU: Ma... |
655 656 657 |
} /* |
8feae1311 NOMMU: Make VMAs ... |
658 |
* release a reference to a region |
33e5d7697 nommu: fix a numb... |
659 |
* - the caller must hold the region semaphore for writing, which this releases |
dd8632a12 NOMMU: Make mmap ... |
660 |
* - the region may not have been added to the tree yet, in which case vm_top |
8feae1311 NOMMU: Make VMAs ... |
661 |
* will equal vm_start |
3034097a5 [PATCH] NOMMU: Or... |
662 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
663 664 |
static void __put_nommu_region(struct vm_region *region) __releases(nommu_region_sem) |
1da177e4c Linux-2.6.12-rc2 |
665 |
{ |
1e2ae599d nommu: struct vm_... |
666 |
kenter("%p{%d}", region, region->vm_usage); |
1da177e4c Linux-2.6.12-rc2 |
667 |
|
8feae1311 NOMMU: Make VMAs ... |
668 |
BUG_ON(!nommu_region_tree.rb_node); |
1da177e4c Linux-2.6.12-rc2 |
669 |
|
1e2ae599d nommu: struct vm_... |
670 |
if (--region->vm_usage == 0) { |
dd8632a12 NOMMU: Make mmap ... |
671 |
if (region->vm_top > region->vm_start) |
8feae1311 NOMMU: Make VMAs ... |
672 673 674 675 676 677 678 679 680 681 |
delete_nommu_region(region); up_write(&nommu_region_sem); if (region->vm_file) fput(region->vm_file); /* IO memory and memory shared directly out of the pagecache * from ramfs/tmpfs mustn't be released here */ if (region->vm_flags & VM_MAPPED_COPY) { kdebug("free series"); |
dd8632a12 NOMMU: Make mmap ... |
682 |
free_page_series(region->vm_start, region->vm_top); |
8feae1311 NOMMU: Make VMAs ... |
683 684 685 686 |
} kmem_cache_free(vm_region_jar, region); } else { up_write(&nommu_region_sem); |
1da177e4c Linux-2.6.12-rc2 |
687 |
} |
8feae1311 NOMMU: Make VMAs ... |
688 |
} |
1da177e4c Linux-2.6.12-rc2 |
689 |
|
8feae1311 NOMMU: Make VMAs ... |
690 691 692 693 694 695 696 |
/* * release a reference to a region */ static void put_nommu_region(struct vm_region *region) { down_write(&nommu_region_sem); __put_nommu_region(region); |
1da177e4c Linux-2.6.12-rc2 |
697 |
} |
3034097a5 [PATCH] NOMMU: Or... |
698 |
/* |
eb8cdec4a nommu: add suppor... |
699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 |
* update protection on a vma */ static void protect_vma(struct vm_area_struct *vma, unsigned long flags) { #ifdef CONFIG_MPU struct mm_struct *mm = vma->vm_mm; long start = vma->vm_start & PAGE_MASK; while (start < vma->vm_end) { protect_page(mm, start, flags); start += PAGE_SIZE; } update_protections(mm); #endif } /* |
8feae1311 NOMMU: Make VMAs ... |
715 716 717 718 |
* add a VMA into a process's mm_struct in the appropriate place in the list * and tree and add to the address space's page tree also if not an anonymous * page * - should be called with mm->mmap_sem held writelocked |
3034097a5 [PATCH] NOMMU: Or... |
719 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
720 |
static void add_vma_to_mm(struct mm_struct *mm, struct vm_area_struct *vma) |
1da177e4c Linux-2.6.12-rc2 |
721 |
{ |
6038def0d mm: nommu: sort m... |
722 |
struct vm_area_struct *pvma, *prev; |
1da177e4c Linux-2.6.12-rc2 |
723 |
struct address_space *mapping; |
6038def0d mm: nommu: sort m... |
724 |
struct rb_node **p, *parent, *rb_prev; |
8feae1311 NOMMU: Make VMAs ... |
725 726 727 728 729 730 731 |
kenter(",%p", vma); BUG_ON(!vma->vm_region); mm->map_count++; vma->vm_mm = mm; |
1da177e4c Linux-2.6.12-rc2 |
732 |
|
eb8cdec4a nommu: add suppor... |
733 |
protect_vma(vma, vma->vm_flags); |
1da177e4c Linux-2.6.12-rc2 |
734 735 736 |
/* add the VMA to the mapping */ if (vma->vm_file) { mapping = vma->vm_file->f_mapping; |
83cde9e8b mm: use new helpe... |
737 |
i_mmap_lock_write(mapping); |
1da177e4c Linux-2.6.12-rc2 |
738 |
flush_dcache_mmap_lock(mapping); |
6b2dbba8b mm: replace vma p... |
739 |
vma_interval_tree_insert(vma, &mapping->i_mmap); |
1da177e4c Linux-2.6.12-rc2 |
740 |
flush_dcache_mmap_unlock(mapping); |
83cde9e8b mm: use new helpe... |
741 |
i_mmap_unlock_write(mapping); |
1da177e4c Linux-2.6.12-rc2 |
742 |
} |
8feae1311 NOMMU: Make VMAs ... |
743 |
/* add the VMA to the tree */ |
6038def0d mm: nommu: sort m... |
744 |
parent = rb_prev = NULL; |
8feae1311 NOMMU: Make VMAs ... |
745 |
p = &mm->mm_rb.rb_node; |
1da177e4c Linux-2.6.12-rc2 |
746 747 748 |
while (*p) { parent = *p; pvma = rb_entry(parent, struct vm_area_struct, vm_rb); |
8feae1311 NOMMU: Make VMAs ... |
749 750 751 |
/* sort by: start addr, end addr, VMA struct addr in that order * (the latter is necessary as we may get identical VMAs) */ if (vma->vm_start < pvma->vm_start) |
1da177e4c Linux-2.6.12-rc2 |
752 |
p = &(*p)->rb_left; |
6038def0d mm: nommu: sort m... |
753 754 |
else if (vma->vm_start > pvma->vm_start) { rb_prev = parent; |
1da177e4c Linux-2.6.12-rc2 |
755 |
p = &(*p)->rb_right; |
6038def0d mm: nommu: sort m... |
756 |
} else if (vma->vm_end < pvma->vm_end) |
8feae1311 NOMMU: Make VMAs ... |
757 |
p = &(*p)->rb_left; |
6038def0d mm: nommu: sort m... |
758 759 |
else if (vma->vm_end > pvma->vm_end) { rb_prev = parent; |
8feae1311 NOMMU: Make VMAs ... |
760 |
p = &(*p)->rb_right; |
6038def0d mm: nommu: sort m... |
761 |
} else if (vma < pvma) |
8feae1311 NOMMU: Make VMAs ... |
762 |
p = &(*p)->rb_left; |
6038def0d mm: nommu: sort m... |
763 764 |
else if (vma > pvma) { rb_prev = parent; |
8feae1311 NOMMU: Make VMAs ... |
765 |
p = &(*p)->rb_right; |
6038def0d mm: nommu: sort m... |
766 |
} else |
8feae1311 NOMMU: Make VMAs ... |
767 |
BUG(); |
1da177e4c Linux-2.6.12-rc2 |
768 769 770 |
} rb_link_node(&vma->vm_rb, parent, p); |
8feae1311 NOMMU: Make VMAs ... |
771 772 773 |
rb_insert_color(&vma->vm_rb, &mm->mm_rb); /* add VMA to the VMA list also */ |
6038def0d mm: nommu: sort m... |
774 775 776 |
prev = NULL; if (rb_prev) prev = rb_entry(rb_prev, struct vm_area_struct, vm_rb); |
8feae1311 NOMMU: Make VMAs ... |
777 |
|
6038def0d mm: nommu: sort m... |
778 |
__vma_link_list(mm, vma, prev, parent); |
1da177e4c Linux-2.6.12-rc2 |
779 |
} |
3034097a5 [PATCH] NOMMU: Or... |
780 |
/* |
8feae1311 NOMMU: Make VMAs ... |
781 |
* delete a VMA from its owning mm_struct and address space |
3034097a5 [PATCH] NOMMU: Or... |
782 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
783 |
static void delete_vma_from_mm(struct vm_area_struct *vma) |
1da177e4c Linux-2.6.12-rc2 |
784 |
{ |
615d6e875 mm: per-thread vm... |
785 |
int i; |
1da177e4c Linux-2.6.12-rc2 |
786 |
struct address_space *mapping; |
8feae1311 NOMMU: Make VMAs ... |
787 |
struct mm_struct *mm = vma->vm_mm; |
615d6e875 mm: per-thread vm... |
788 |
struct task_struct *curr = current; |
8feae1311 NOMMU: Make VMAs ... |
789 790 |
kenter("%p", vma); |
eb8cdec4a nommu: add suppor... |
791 |
protect_vma(vma, 0); |
8feae1311 NOMMU: Make VMAs ... |
792 |
mm->map_count--; |
615d6e875 mm: per-thread vm... |
793 794 795 |
for (i = 0; i < VMACACHE_SIZE; i++) { /* if the vma is cached, invalidate the entire cache */ if (curr->vmacache[i] == vma) { |
e020d5bd8 mm: nommu: per-th... |
796 |
vmacache_invalidate(mm); |
615d6e875 mm: per-thread vm... |
797 798 799 |
break; } } |
1da177e4c Linux-2.6.12-rc2 |
800 801 802 803 |
/* remove the VMA from the mapping */ if (vma->vm_file) { mapping = vma->vm_file->f_mapping; |
83cde9e8b mm: use new helpe... |
804 |
i_mmap_lock_write(mapping); |
1da177e4c Linux-2.6.12-rc2 |
805 |
flush_dcache_mmap_lock(mapping); |
6b2dbba8b mm: replace vma p... |
806 |
vma_interval_tree_remove(vma, &mapping->i_mmap); |
1da177e4c Linux-2.6.12-rc2 |
807 |
flush_dcache_mmap_unlock(mapping); |
83cde9e8b mm: use new helpe... |
808 |
i_mmap_unlock_write(mapping); |
1da177e4c Linux-2.6.12-rc2 |
809 |
} |
8feae1311 NOMMU: Make VMAs ... |
810 811 |
/* remove from the MM's tree and list */ rb_erase(&vma->vm_rb, &mm->mm_rb); |
b951bf2c4 mm: nommu: don't ... |
812 813 814 815 816 817 818 819 |
if (vma->vm_prev) vma->vm_prev->vm_next = vma->vm_next; else mm->mmap = vma->vm_next; if (vma->vm_next) vma->vm_next->vm_prev = vma->vm_prev; |
8feae1311 NOMMU: Make VMAs ... |
820 821 822 823 824 825 826 827 828 829 |
} /* * destroy a VMA record */ static void delete_vma(struct mm_struct *mm, struct vm_area_struct *vma) { kenter("%p", vma); if (vma->vm_ops && vma->vm_ops->close) vma->vm_ops->close(vma); |
e9714acf8 mm: kill vma flag... |
830 |
if (vma->vm_file) |
8feae1311 NOMMU: Make VMAs ... |
831 |
fput(vma->vm_file); |
8feae1311 NOMMU: Make VMAs ... |
832 833 834 835 836 837 838 839 840 841 842 |
put_nommu_region(vma->vm_region); kmem_cache_free(vm_area_cachep, vma); } /* * 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_area_struct *vma; |
8feae1311 NOMMU: Make VMAs ... |
843 844 |
/* check the cache first */ |
615d6e875 mm: per-thread vm... |
845 846 |
vma = vmacache_find(mm, addr); if (likely(vma)) |
8feae1311 NOMMU: Make VMAs ... |
847 |
return vma; |
e922c4c53 mm: nommu: find v... |
848 |
/* trawl the list (there may be multiple mappings in which addr |
8feae1311 NOMMU: Make VMAs ... |
849 |
* resides) */ |
e922c4c53 mm: nommu: find v... |
850 |
for (vma = mm->mmap; vma; vma = vma->vm_next) { |
8feae1311 NOMMU: Make VMAs ... |
851 852 853 |
if (vma->vm_start > addr) return NULL; if (vma->vm_end > addr) { |
615d6e875 mm: per-thread vm... |
854 |
vmacache_update(addr, vma); |
8feae1311 NOMMU: Make VMAs ... |
855 856 857 858 859 860 861 862 863 864 865 866 867 868 |
return vma; } } return NULL; } EXPORT_SYMBOL(find_vma); /* * 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) { |
7561e8ca0 NOMMU: Revert 'no... |
869 |
return find_vma(mm, addr); |
8feae1311 NOMMU: Make VMAs ... |
870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 |
} /* * expand a stack to a given address * - not supported under NOMMU conditions */ int expand_stack(struct vm_area_struct *vma, unsigned long address) { return -ENOMEM; } /* * look up the first VMA exactly that exactly matches addr * - should be called with mm->mmap_sem at least held readlocked */ static struct vm_area_struct *find_vma_exact(struct mm_struct *mm, unsigned long addr, unsigned long len) { struct vm_area_struct *vma; |
8feae1311 NOMMU: Make VMAs ... |
890 891 892 |
unsigned long end = addr + len; /* check the cache first */ |
615d6e875 mm: per-thread vm... |
893 894 |
vma = vmacache_find_exact(mm, addr, end); if (vma) |
8feae1311 NOMMU: Make VMAs ... |
895 |
return vma; |
e922c4c53 mm: nommu: find v... |
896 |
/* trawl the list (there may be multiple mappings in which addr |
8feae1311 NOMMU: Make VMAs ... |
897 |
* resides) */ |
e922c4c53 mm: nommu: find v... |
898 |
for (vma = mm->mmap; vma; vma = vma->vm_next) { |
8feae1311 NOMMU: Make VMAs ... |
899 900 901 902 903 |
if (vma->vm_start < addr) continue; if (vma->vm_start > addr) return NULL; if (vma->vm_end == end) { |
615d6e875 mm: per-thread vm... |
904 |
vmacache_update(addr, vma); |
8feae1311 NOMMU: Make VMAs ... |
905 906 907 908 909 |
return vma; } } return NULL; |
1da177e4c Linux-2.6.12-rc2 |
910 911 912 913 914 915 916 917 918 919 920 921 922 923 |
} /* * 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) { |
8feae1311 NOMMU: Make VMAs ... |
924 |
unsigned long capabilities, rlen; |
1da177e4c Linux-2.6.12-rc2 |
925 926 927 |
int ret; /* do the simple checks first */ |
06aab5a30 NOMMU: Ignore mma... |
928 |
if (flags & MAP_FIXED) { |
1da177e4c Linux-2.6.12-rc2 |
929 930 931 932 933 934 935 936 937 938 |
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; |
f81cff0d4 [PATCH] uclinux: ... |
939 |
if (!len) |
1da177e4c Linux-2.6.12-rc2 |
940 |
return -EINVAL; |
f81cff0d4 [PATCH] uclinux: ... |
941 |
/* Careful about overflows.. */ |
8feae1311 NOMMU: Make VMAs ... |
942 943 |
rlen = PAGE_ALIGN(len); if (!rlen || rlen > TASK_SIZE) |
f81cff0d4 [PATCH] uclinux: ... |
944 |
return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
945 |
/* offset overflow? */ |
8feae1311 NOMMU: Make VMAs ... |
946 |
if ((pgoff + (rlen >> PAGE_SHIFT)) < pgoff) |
f81cff0d4 [PATCH] uclinux: ... |
947 |
return -EOVERFLOW; |
1da177e4c Linux-2.6.12-rc2 |
948 949 |
if (file) { |
1da177e4c Linux-2.6.12-rc2 |
950 |
/* files must support mmap */ |
72c2d5319 file->f_op is nev... |
951 |
if (!file->f_op->mmap) |
1da177e4c Linux-2.6.12-rc2 |
952 953 954 955 956 957 |
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 */ |
b4caecd48 fs: introduce f_o... |
958 959 960 |
if (file->f_op->mmap_capabilities) { capabilities = file->f_op->mmap_capabilities(file); } else { |
1da177e4c Linux-2.6.12-rc2 |
961 962 |
/* no explicit capabilities set, so assume some * defaults */ |
496ad9aa8 new helper: file_... |
963 |
switch (file_inode(file)->i_mode & S_IFMT) { |
1da177e4c Linux-2.6.12-rc2 |
964 965 |
case S_IFREG: case S_IFBLK: |
b4caecd48 fs: introduce f_o... |
966 |
capabilities = NOMMU_MAP_COPY; |
1da177e4c Linux-2.6.12-rc2 |
967 968 969 970 |
break; case S_IFCHR: capabilities = |
b4caecd48 fs: introduce f_o... |
971 972 973 |
NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; |
1da177e4c Linux-2.6.12-rc2 |
974 975 976 977 978 979 980 981 982 983 |
break; default: return -EINVAL; } } /* eliminate any capabilities that we can't support on this * device */ if (!file->f_op->get_unmapped_area) |
b4caecd48 fs: introduce f_o... |
984 |
capabilities &= ~NOMMU_MAP_DIRECT; |
6e242a1ce nommu: use __vfs_... |
985 |
if (!(file->f_mode & FMODE_CAN_READ)) |
b4caecd48 fs: introduce f_o... |
986 |
capabilities &= ~NOMMU_MAP_COPY; |
1da177e4c Linux-2.6.12-rc2 |
987 |
|
28d7a6ae9 nommu: check fd r... |
988 989 990 |
/* The file shall have been opened with read permission. */ if (!(file->f_mode & FMODE_READ)) return -EACCES; |
1da177e4c Linux-2.6.12-rc2 |
991 992 993 994 995 |
if (flags & MAP_SHARED) { /* do checks for writing, appending and locking */ if ((prot & PROT_WRITE) && !(file->f_mode & FMODE_WRITE)) return -EACCES; |
496ad9aa8 new helper: file_... |
996 |
if (IS_APPEND(file_inode(file)) && |
1da177e4c Linux-2.6.12-rc2 |
997 998 |
(file->f_mode & FMODE_WRITE)) return -EACCES; |
d7a06983a locks: fix locks_... |
999 |
if (locks_verify_locked(file)) |
1da177e4c Linux-2.6.12-rc2 |
1000 |
return -EAGAIN; |
b4caecd48 fs: introduce f_o... |
1001 |
if (!(capabilities & NOMMU_MAP_DIRECT)) |
1da177e4c Linux-2.6.12-rc2 |
1002 |
return -ENODEV; |
1da177e4c Linux-2.6.12-rc2 |
1003 |
/* we mustn't privatise shared mappings */ |
b4caecd48 fs: introduce f_o... |
1004 |
capabilities &= ~NOMMU_MAP_COPY; |
ac7149045 mm: fix 'ERROR: d... |
1005 |
} else { |
1da177e4c Linux-2.6.12-rc2 |
1006 1007 |
/* we're going to read the file into private memory we * allocate */ |
b4caecd48 fs: introduce f_o... |
1008 |
if (!(capabilities & NOMMU_MAP_COPY)) |
1da177e4c Linux-2.6.12-rc2 |
1009 1010 1011 1012 1013 |
return -ENODEV; /* we don't permit a private writable mapping to be * shared with the backing device */ if (prot & PROT_WRITE) |
b4caecd48 fs: introduce f_o... |
1014 |
capabilities &= ~NOMMU_MAP_DIRECT; |
1da177e4c Linux-2.6.12-rc2 |
1015 |
} |
b4caecd48 fs: introduce f_o... |
1016 1017 1018 1019 |
if (capabilities & NOMMU_MAP_DIRECT) { if (((prot & PROT_READ) && !(capabilities & NOMMU_MAP_READ)) || ((prot & PROT_WRITE) && !(capabilities & NOMMU_MAP_WRITE)) || ((prot & PROT_EXEC) && !(capabilities & NOMMU_MAP_EXEC)) |
3c7b20454 nommu: allow priv... |
1020 |
) { |
b4caecd48 fs: introduce f_o... |
1021 |
capabilities &= ~NOMMU_MAP_DIRECT; |
3c7b20454 nommu: allow priv... |
1022 1023 1024 1025 1026 1027 1028 1029 |
if (flags & MAP_SHARED) { printk(KERN_WARNING "MAP_SHARED not completely supported on !MMU "); return -EINVAL; } } } |
1da177e4c Linux-2.6.12-rc2 |
1030 1031 |
/* handle executable mappings and implied executable * mappings */ |
e9536ae72 [PATCH] struct pa... |
1032 |
if (file->f_path.mnt->mnt_flags & MNT_NOEXEC) { |
1da177e4c Linux-2.6.12-rc2 |
1033 1034 |
if (prot & PROT_EXEC) return -EPERM; |
ac7149045 mm: fix 'ERROR: d... |
1035 |
} else if ((prot & PROT_READ) && !(prot & PROT_EXEC)) { |
1da177e4c Linux-2.6.12-rc2 |
1036 1037 |
/* handle implication of PROT_EXEC by PROT_READ */ if (current->personality & READ_IMPLIES_EXEC) { |
b4caecd48 fs: introduce f_o... |
1038 |
if (capabilities & NOMMU_MAP_EXEC) |
1da177e4c Linux-2.6.12-rc2 |
1039 1040 |
prot |= PROT_EXEC; } |
ac7149045 mm: fix 'ERROR: d... |
1041 |
} else if ((prot & PROT_READ) && |
1da177e4c Linux-2.6.12-rc2 |
1042 |
(prot & PROT_EXEC) && |
b4caecd48 fs: introduce f_o... |
1043 |
!(capabilities & NOMMU_MAP_EXEC) |
1da177e4c Linux-2.6.12-rc2 |
1044 1045 |
) { /* backing file is not executable, try to copy */ |
b4caecd48 fs: introduce f_o... |
1046 |
capabilities &= ~NOMMU_MAP_DIRECT; |
1da177e4c Linux-2.6.12-rc2 |
1047 |
} |
ac7149045 mm: fix 'ERROR: d... |
1048 |
} else { |
1da177e4c Linux-2.6.12-rc2 |
1049 1050 1051 |
/* anonymous mappings are always memory backed and can be * privately mapped */ |
b4caecd48 fs: introduce f_o... |
1052 |
capabilities = NOMMU_MAP_COPY; |
1da177e4c Linux-2.6.12-rc2 |
1053 1054 1055 1056 1057 1058 1059 1060 |
/* 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 */ |
e5467859f split ->file_mmap... |
1061 1062 1063 |
ret = security_mmap_addr(addr); if (ret < 0) return ret; |
1da177e4c Linux-2.6.12-rc2 |
1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 |
/* 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); |
1da177e4c Linux-2.6.12-rc2 |
1082 |
/* vm_flags |= mm->def_flags; */ |
b4caecd48 fs: introduce f_o... |
1083 |
if (!(capabilities & NOMMU_MAP_DIRECT)) { |
1da177e4c Linux-2.6.12-rc2 |
1084 |
/* attempt to share read-only copies of mapped file chunks */ |
3c7b20454 nommu: allow priv... |
1085 |
vm_flags |= VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC; |
1da177e4c Linux-2.6.12-rc2 |
1086 1087 |
if (file && !(prot & PROT_WRITE)) vm_flags |= VM_MAYSHARE; |
3c7b20454 nommu: allow priv... |
1088 |
} else { |
1da177e4c Linux-2.6.12-rc2 |
1089 1090 1091 |
/* overlay a shareable mapping on the backing device or inode * if possible - used for chardevs, ramfs/tmpfs/shmfs and * romfs/cramfs */ |
b4caecd48 fs: introduce f_o... |
1092 |
vm_flags |= VM_MAYSHARE | (capabilities & NOMMU_VMFLAGS); |
1da177e4c Linux-2.6.12-rc2 |
1093 |
if (flags & MAP_SHARED) |
3c7b20454 nommu: allow priv... |
1094 |
vm_flags |= VM_SHARED; |
1da177e4c Linux-2.6.12-rc2 |
1095 1096 1097 1098 1099 1100 |
} /* 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 */ |
a288eecce ptrace: kill triv... |
1101 |
if ((flags & MAP_PRIVATE) && current->ptrace) |
1da177e4c Linux-2.6.12-rc2 |
1102 1103 1104 1105 1106 1107 |
vm_flags &= ~VM_MAYSHARE; return vm_flags; } /* |
8feae1311 NOMMU: Make VMAs ... |
1108 1109 |
* set up a shared mapping on a file (the driver or filesystem provides and * pins the storage) |
1da177e4c Linux-2.6.12-rc2 |
1110 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
1111 |
static int do_mmap_shared_file(struct vm_area_struct *vma) |
1da177e4c Linux-2.6.12-rc2 |
1112 1113 1114 1115 |
{ int ret; ret = vma->vm_file->f_op->mmap(vma->vm_file, vma); |
dd8632a12 NOMMU: Make mmap ... |
1116 1117 |
if (ret == 0) { vma->vm_region->vm_top = vma->vm_region->vm_end; |
645d83c5d NOMMU: Fix MAP_PR... |
1118 |
return 0; |
dd8632a12 NOMMU: Make mmap ... |
1119 |
} |
1da177e4c Linux-2.6.12-rc2 |
1120 1121 |
if (ret != -ENOSYS) return ret; |
3fa30460e nommu: fix an inc... |
1122 1123 1124 |
/* getting -ENOSYS indicates that direct mmap isn't possible (as * opposed to tried but failed) so we can only give a suitable error as * it's not possible to make a private copy if MAP_SHARED was given */ |
1da177e4c Linux-2.6.12-rc2 |
1125 1126 1127 1128 1129 1130 |
return -ENODEV; } /* * set up a private mapping or an anonymous shared mapping */ |
8feae1311 NOMMU: Make VMAs ... |
1131 1132 |
static int do_mmap_private(struct vm_area_struct *vma, struct vm_region *region, |
645d83c5d NOMMU: Fix MAP_PR... |
1133 1134 |
unsigned long len, unsigned long capabilities) |
1da177e4c Linux-2.6.12-rc2 |
1135 |
{ |
dbc8358c7 mm/nommu: use all... |
1136 |
unsigned long total, point; |
1da177e4c Linux-2.6.12-rc2 |
1137 |
void *base; |
8feae1311 NOMMU: Make VMAs ... |
1138 |
int ret, order; |
1da177e4c Linux-2.6.12-rc2 |
1139 1140 1141 1142 1143 |
/* 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 */ |
b4caecd48 fs: introduce f_o... |
1144 |
if (capabilities & NOMMU_MAP_DIRECT) { |
1da177e4c Linux-2.6.12-rc2 |
1145 |
ret = vma->vm_file->f_op->mmap(vma->vm_file, vma); |
dd8632a12 NOMMU: Make mmap ... |
1146 |
if (ret == 0) { |
1da177e4c Linux-2.6.12-rc2 |
1147 |
/* shouldn't return success if we're not sharing */ |
dd8632a12 NOMMU: Make mmap ... |
1148 1149 |
BUG_ON(!(vma->vm_flags & VM_MAYSHARE)); vma->vm_region->vm_top = vma->vm_region->vm_end; |
645d83c5d NOMMU: Fix MAP_PR... |
1150 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
1151 |
} |
dd8632a12 NOMMU: Make mmap ... |
1152 1153 |
if (ret != -ENOSYS) return ret; |
1da177e4c Linux-2.6.12-rc2 |
1154 1155 1156 1157 1158 |
/* 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 */ } |
8feae1311 NOMMU: Make VMAs ... |
1159 |
|
1da177e4c Linux-2.6.12-rc2 |
1160 1161 1162 1163 |
/* 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 */ |
f67d9b157 nommu: add page a... |
1164 |
order = get_order(len); |
8feae1311 NOMMU: Make VMAs ... |
1165 |
kdebug("alloc order %d for %lx", order, len); |
8feae1311 NOMMU: Make VMAs ... |
1166 |
total = 1 << order; |
f67d9b157 nommu: add page a... |
1167 |
point = len >> PAGE_SHIFT; |
dd8632a12 NOMMU: Make mmap ... |
1168 |
|
dbc8358c7 mm/nommu: use all... |
1169 |
/* we don't want to allocate a power-of-2 sized page set */ |
dd8632a12 NOMMU: Make mmap ... |
1170 |
if (sysctl_nr_trim_pages && total - point >= sysctl_nr_trim_pages) { |
dbc8358c7 mm/nommu: use all... |
1171 1172 |
total = point; kdebug("try to alloc exact %lu pages", total); |
8feae1311 NOMMU: Make VMAs ... |
1173 |
} |
da616534e mm/nommu: fix mem... |
1174 |
base = alloc_pages_exact(total << PAGE_SHIFT, GFP_KERNEL); |
dbc8358c7 mm/nommu: use all... |
1175 1176 1177 1178 |
if (!base) goto enomem; atomic_long_add(total, &mmap_pages_allocated); |
1da177e4c Linux-2.6.12-rc2 |
1179 |
|
8feae1311 NOMMU: Make VMAs ... |
1180 1181 |
region->vm_flags = vma->vm_flags |= VM_MAPPED_COPY; region->vm_start = (unsigned long) base; |
f67d9b157 nommu: add page a... |
1182 |
region->vm_end = region->vm_start + len; |
dd8632a12 NOMMU: Make mmap ... |
1183 |
region->vm_top = region->vm_start + (total << PAGE_SHIFT); |
8feae1311 NOMMU: Make VMAs ... |
1184 1185 1186 |
vma->vm_start = region->vm_start; vma->vm_end = region->vm_start + len; |
1da177e4c Linux-2.6.12-rc2 |
1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 |
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); |
6e242a1ce nommu: use __vfs_... |
1198 |
ret = __vfs_read(vma->vm_file, base, len, &fpos); |
1da177e4c Linux-2.6.12-rc2 |
1199 1200 1201 1202 1203 1204 |
set_fs(old_fs); if (ret < 0) goto error_free; /* clear the last little bit */ |
f67d9b157 nommu: add page a... |
1205 1206 |
if (ret < len) memset(base + ret, 0, len - ret); |
1da177e4c Linux-2.6.12-rc2 |
1207 |
|
1da177e4c Linux-2.6.12-rc2 |
1208 1209 1210 1211 1212 |
} return 0; error_free: |
7223bb4a8 mm: nommu: fix a ... |
1213 |
free_page_series(region->vm_start, region->vm_top); |
8feae1311 NOMMU: Make VMAs ... |
1214 1215 |
region->vm_start = vma->vm_start = 0; region->vm_end = vma->vm_end = 0; |
dd8632a12 NOMMU: Make mmap ... |
1216 |
region->vm_top = 0; |
1da177e4c Linux-2.6.12-rc2 |
1217 1218 1219 |
return ret; enomem: |
b1de0d139 mm: convert some ... |
1220 1221 |
pr_err("Allocation of length %lu from process %d (%s) failed ", |
05ae6fa31 uclinux: add proc... |
1222 |
len, current->pid, current->comm); |
7bf02ea22 arch, mm: filter ... |
1223 |
show_free_areas(0); |
1da177e4c Linux-2.6.12-rc2 |
1224 1225 1226 1227 1228 1229 |
return -ENOMEM; } /* * handle mapping creation for uClinux */ |
e3fc629d7 switch aio and sh... |
1230 |
unsigned long do_mmap_pgoff(struct file *file, |
1da177e4c Linux-2.6.12-rc2 |
1231 1232 1233 1234 |
unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, |
bebeb3d68 mm: introduce mm_... |
1235 |
unsigned long pgoff, |
41badc15c mm: make do_mmap_... |
1236 |
unsigned long *populate) |
1da177e4c Linux-2.6.12-rc2 |
1237 |
{ |
8feae1311 NOMMU: Make VMAs ... |
1238 1239 |
struct vm_area_struct *vma; struct vm_region *region; |
1da177e4c Linux-2.6.12-rc2 |
1240 |
struct rb_node *rb; |
8feae1311 NOMMU: Make VMAs ... |
1241 |
unsigned long capabilities, vm_flags, result; |
1da177e4c Linux-2.6.12-rc2 |
1242 |
int ret; |
8feae1311 NOMMU: Make VMAs ... |
1243 |
kenter(",%lx,%lx,%lx,%lx,%lx", addr, len, prot, flags, pgoff); |
41badc15c mm: make do_mmap_... |
1244 |
*populate = 0; |
bebeb3d68 mm: introduce mm_... |
1245 |
|
1da177e4c Linux-2.6.12-rc2 |
1246 1247 1248 1249 |
/* 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); |
8feae1311 NOMMU: Make VMAs ... |
1250 1251 |
if (ret < 0) { kleave(" = %d [val]", ret); |
1da177e4c Linux-2.6.12-rc2 |
1252 |
return ret; |
8feae1311 NOMMU: Make VMAs ... |
1253 |
} |
1da177e4c Linux-2.6.12-rc2 |
1254 |
|
06aab5a30 NOMMU: Ignore mma... |
1255 1256 |
/* we ignore the address hint */ addr = 0; |
f67d9b157 nommu: add page a... |
1257 |
len = PAGE_ALIGN(len); |
06aab5a30 NOMMU: Ignore mma... |
1258 |
|
1da177e4c Linux-2.6.12-rc2 |
1259 1260 1261 |
/* 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); |
8feae1311 NOMMU: Make VMAs ... |
1262 1263 1264 1265 1266 1267 1268 1269 |
/* we're going to need to record the mapping */ region = kmem_cache_zalloc(vm_region_jar, GFP_KERNEL); if (!region) goto error_getting_region; vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL); if (!vma) goto error_getting_vma; |
1da177e4c Linux-2.6.12-rc2 |
1270 |
|
1e2ae599d nommu: struct vm_... |
1271 |
region->vm_usage = 1; |
8feae1311 NOMMU: Make VMAs ... |
1272 1273 |
region->vm_flags = vm_flags; region->vm_pgoff = pgoff; |
5beb49305 mm: change anon_v... |
1274 |
INIT_LIST_HEAD(&vma->anon_vma_chain); |
8feae1311 NOMMU: Make VMAs ... |
1275 1276 |
vma->vm_flags = vm_flags; vma->vm_pgoff = pgoff; |
1da177e4c Linux-2.6.12-rc2 |
1277 |
|
8feae1311 NOMMU: Make VMAs ... |
1278 |
if (file) { |
cb0942b81 make get_file() r... |
1279 1280 |
region->vm_file = get_file(file); vma->vm_file = get_file(file); |
8feae1311 NOMMU: Make VMAs ... |
1281 1282 1283 1284 1285 |
} down_write(&nommu_region_sem); /* if we want to share, we need to check for regions created by other |
1da177e4c Linux-2.6.12-rc2 |
1286 |
* mmap() calls that overlap with our proposed mapping |
8feae1311 NOMMU: Make VMAs ... |
1287 |
* - we can only share with a superset match on most regular files |
1da177e4c Linux-2.6.12-rc2 |
1288 1289 1290 1291 1292 1293 |
* - 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) { |
8feae1311 NOMMU: Make VMAs ... |
1294 1295 |
struct vm_region *pregion; unsigned long pglen, rpglen, pgend, rpgend, start; |
1da177e4c Linux-2.6.12-rc2 |
1296 |
|
8feae1311 NOMMU: Make VMAs ... |
1297 1298 |
pglen = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; pgend = pgoff + pglen; |
165b23927 [PATCH] NOMMU: ma... |
1299 |
|
8feae1311 NOMMU: Make VMAs ... |
1300 1301 |
for (rb = rb_first(&nommu_region_tree); rb; rb = rb_next(rb)) { pregion = rb_entry(rb, struct vm_region, vm_rb); |
1da177e4c Linux-2.6.12-rc2 |
1302 |
|
8feae1311 NOMMU: Make VMAs ... |
1303 |
if (!(pregion->vm_flags & VM_MAYSHARE)) |
1da177e4c Linux-2.6.12-rc2 |
1304 1305 1306 |
continue; /* search for overlapping mappings on the same file */ |
496ad9aa8 new helper: file_... |
1307 1308 |
if (file_inode(pregion->vm_file) != file_inode(file)) |
1da177e4c Linux-2.6.12-rc2 |
1309 |
continue; |
8feae1311 NOMMU: Make VMAs ... |
1310 |
if (pregion->vm_pgoff >= pgend) |
1da177e4c Linux-2.6.12-rc2 |
1311 |
continue; |
8feae1311 NOMMU: Make VMAs ... |
1312 1313 1314 1315 |
rpglen = pregion->vm_end - pregion->vm_start; rpglen = (rpglen + PAGE_SIZE - 1) >> PAGE_SHIFT; rpgend = pregion->vm_pgoff + rpglen; if (pgoff >= rpgend) |
1da177e4c Linux-2.6.12-rc2 |
1316 |
continue; |
8feae1311 NOMMU: Make VMAs ... |
1317 1318 1319 1320 1321 |
/* handle inexactly overlapping matches between * mappings */ if ((pregion->vm_pgoff != pgoff || rpglen != pglen) && !(pgoff >= pregion->vm_pgoff && pgend <= rpgend)) { /* new mapping is not a subset of the region */ |
b4caecd48 fs: introduce f_o... |
1322 |
if (!(capabilities & NOMMU_MAP_DIRECT)) |
1da177e4c Linux-2.6.12-rc2 |
1323 1324 1325 |
goto sharing_violation; continue; } |
8feae1311 NOMMU: Make VMAs ... |
1326 |
/* we've found a region we can share */ |
1e2ae599d nommu: struct vm_... |
1327 |
pregion->vm_usage++; |
8feae1311 NOMMU: Make VMAs ... |
1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 |
vma->vm_region = pregion; start = pregion->vm_start; start += (pgoff - pregion->vm_pgoff) << PAGE_SHIFT; vma->vm_start = start; vma->vm_end = start + len; if (pregion->vm_flags & VM_MAPPED_COPY) { kdebug("share copy"); vma->vm_flags |= VM_MAPPED_COPY; } else { kdebug("share mmap"); ret = do_mmap_shared_file(vma); if (ret < 0) { vma->vm_region = NULL; vma->vm_start = 0; vma->vm_end = 0; |
1e2ae599d nommu: struct vm_... |
1344 |
pregion->vm_usage--; |
8feae1311 NOMMU: Make VMAs ... |
1345 1346 1347 1348 1349 1350 1351 1352 1353 |
pregion = NULL; goto error_just_free; } } fput(region->vm_file); kmem_cache_free(vm_region_jar, region); region = pregion; result = start; goto share; |
1da177e4c Linux-2.6.12-rc2 |
1354 |
} |
1da177e4c Linux-2.6.12-rc2 |
1355 1356 1357 1358 |
/* 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 */ |
b4caecd48 fs: introduce f_o... |
1359 |
if (capabilities & NOMMU_MAP_DIRECT) { |
1da177e4c Linux-2.6.12-rc2 |
1360 1361 |
addr = file->f_op->get_unmapped_area(file, addr, len, pgoff, flags); |
bb005a59e mm: nommu: fix a ... |
1362 |
if (IS_ERR_VALUE(addr)) { |
1da177e4c Linux-2.6.12-rc2 |
1363 |
ret = addr; |
bb005a59e mm: nommu: fix a ... |
1364 |
if (ret != -ENOSYS) |
8feae1311 NOMMU: Make VMAs ... |
1365 |
goto error_just_free; |
1da177e4c Linux-2.6.12-rc2 |
1366 1367 1368 1369 |
/* the driver refused to tell us where to site * the mapping so we'll have to attempt to copy * it */ |
bb005a59e mm: nommu: fix a ... |
1370 |
ret = -ENODEV; |
b4caecd48 fs: introduce f_o... |
1371 |
if (!(capabilities & NOMMU_MAP_COPY)) |
8feae1311 NOMMU: Make VMAs ... |
1372 |
goto error_just_free; |
1da177e4c Linux-2.6.12-rc2 |
1373 |
|
b4caecd48 fs: introduce f_o... |
1374 |
capabilities &= ~NOMMU_MAP_DIRECT; |
8feae1311 NOMMU: Make VMAs ... |
1375 1376 1377 |
} else { vma->vm_start = region->vm_start = addr; vma->vm_end = region->vm_end = addr + len; |
1da177e4c Linux-2.6.12-rc2 |
1378 1379 1380 |
} } } |
8feae1311 NOMMU: Make VMAs ... |
1381 |
vma->vm_region = region; |
1da177e4c Linux-2.6.12-rc2 |
1382 |
|
645d83c5d NOMMU: Fix MAP_PR... |
1383 |
/* set up the mapping |
b4caecd48 fs: introduce f_o... |
1384 |
* - the region is filled in if NOMMU_MAP_DIRECT is still set |
645d83c5d NOMMU: Fix MAP_PR... |
1385 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1386 |
if (file && vma->vm_flags & VM_SHARED) |
8feae1311 NOMMU: Make VMAs ... |
1387 |
ret = do_mmap_shared_file(vma); |
1da177e4c Linux-2.6.12-rc2 |
1388 |
else |
645d83c5d NOMMU: Fix MAP_PR... |
1389 |
ret = do_mmap_private(vma, region, len, capabilities); |
1da177e4c Linux-2.6.12-rc2 |
1390 |
if (ret < 0) |
645d83c5d NOMMU: Fix MAP_PR... |
1391 1392 |
goto error_just_free; add_nommu_region(region); |
8feae1311 NOMMU: Make VMAs ... |
1393 |
|
ea6376395 nommu: fix malloc... |
1394 1395 1396 1397 |
/* clear anonymous mappings that don't ask for uninitialized data */ if (!vma->vm_file && !(flags & MAP_UNINITIALIZED)) memset((void *)region->vm_start, 0, region->vm_end - region->vm_start); |
1da177e4c Linux-2.6.12-rc2 |
1398 |
/* okay... we have a mapping; now we have to register it */ |
8feae1311 NOMMU: Make VMAs ... |
1399 |
result = vma->vm_start; |
1da177e4c Linux-2.6.12-rc2 |
1400 |
|
1da177e4c Linux-2.6.12-rc2 |
1401 |
current->mm->total_vm += len >> PAGE_SHIFT; |
8feae1311 NOMMU: Make VMAs ... |
1402 1403 |
share: add_vma_to_mm(current->mm, vma); |
1da177e4c Linux-2.6.12-rc2 |
1404 |
|
cfe79c00a NOMMU: Avoiding d... |
1405 1406 1407 1408 1409 1410 |
/* we flush the region from the icache only when the first executable * mapping of it is made */ if (vma->vm_flags & VM_EXEC && !region->vm_icache_flushed) { flush_icache_range(region->vm_start, region->vm_end); region->vm_icache_flushed = true; } |
1da177e4c Linux-2.6.12-rc2 |
1411 |
|
cfe79c00a NOMMU: Avoiding d... |
1412 |
up_write(&nommu_region_sem); |
1da177e4c Linux-2.6.12-rc2 |
1413 |
|
8feae1311 NOMMU: Make VMAs ... |
1414 1415 |
kleave(" = %lx", result); return result; |
1da177e4c Linux-2.6.12-rc2 |
1416 |
|
8feae1311 NOMMU: Make VMAs ... |
1417 1418 1419 |
error_just_free: up_write(&nommu_region_sem); error: |
89a864027 NOMMU: Don't pass... |
1420 1421 |
if (region->vm_file) fput(region->vm_file); |
8feae1311 NOMMU: Make VMAs ... |
1422 |
kmem_cache_free(vm_region_jar, region); |
89a864027 NOMMU: Don't pass... |
1423 1424 |
if (vma->vm_file) fput(vma->vm_file); |
8feae1311 NOMMU: Make VMAs ... |
1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 |
kmem_cache_free(vm_area_cachep, vma); kleave(" = %d", ret); return ret; sharing_violation: up_write(&nommu_region_sem); printk(KERN_WARNING "Attempt to share mismatched mappings "); ret = -EINVAL; goto error; |
1da177e4c Linux-2.6.12-rc2 |
1435 |
|
8feae1311 NOMMU: Make VMAs ... |
1436 1437 1438 1439 1440 |
error_getting_vma: kmem_cache_free(vm_region_jar, region); printk(KERN_WARNING "Allocation of vma for %lu byte allocation" " from process %d failed ", |
1da177e4c Linux-2.6.12-rc2 |
1441 |
len, current->pid); |
7bf02ea22 arch, mm: filter ... |
1442 |
show_free_areas(0); |
1da177e4c Linux-2.6.12-rc2 |
1443 |
return -ENOMEM; |
8feae1311 NOMMU: Make VMAs ... |
1444 1445 1446 1447 |
error_getting_region: printk(KERN_WARNING "Allocation of vm region for %lu byte allocation" " from process %d failed ", |
1da177e4c Linux-2.6.12-rc2 |
1448 |
len, current->pid); |
7bf02ea22 arch, mm: filter ... |
1449 |
show_free_areas(0); |
1da177e4c Linux-2.6.12-rc2 |
1450 1451 |
return -ENOMEM; } |
6be5ceb02 VM: add "vm_mmap(... |
1452 |
|
66f0dc481 mm: move sys_mmap... |
1453 1454 1455 1456 1457 1458 |
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; |
120a795da audit mmap |
1459 |
audit_mmap_fd(fd, flags); |
66f0dc481 mm: move sys_mmap... |
1460 1461 1462 1463 1464 1465 1466 |
if (!(flags & MAP_ANONYMOUS)) { file = fget(fd); if (!file) goto out; } flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); |
ad1ed2937 nommu: fix compil... |
1467 |
retval = vm_mmap_pgoff(file, addr, len, prot, flags, pgoff); |
66f0dc481 mm: move sys_mmap... |
1468 1469 1470 1471 1472 1473 |
if (file) fput(file); out: return retval; } |
a4679373c Add generic sys_o... |
1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 |
#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 */ |
1da177e4c Linux-2.6.12-rc2 |
1497 |
/* |
8feae1311 NOMMU: Make VMAs ... |
1498 1499 |
* split a vma into two pieces at address 'addr', a new vma is allocated either * for the first part or the tail. |
1da177e4c Linux-2.6.12-rc2 |
1500 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
1501 1502 |
int split_vma(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long addr, int new_below) |
1da177e4c Linux-2.6.12-rc2 |
1503 |
{ |
8feae1311 NOMMU: Make VMAs ... |
1504 1505 1506 |
struct vm_area_struct *new; struct vm_region *region; unsigned long npages; |
1da177e4c Linux-2.6.12-rc2 |
1507 |
|
8feae1311 NOMMU: Make VMAs ... |
1508 |
kenter(""); |
1da177e4c Linux-2.6.12-rc2 |
1509 |
|
779c10232 nommu: remove a s... |
1510 1511 1512 |
/* we're only permitted to split anonymous regions (these should have * only a single usage on the region) */ if (vma->vm_file) |
8feae1311 NOMMU: Make VMAs ... |
1513 |
return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1514 |
|
8feae1311 NOMMU: Make VMAs ... |
1515 1516 |
if (mm->map_count >= sysctl_max_map_count) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1517 |
|
8feae1311 NOMMU: Make VMAs ... |
1518 1519 1520 |
region = kmem_cache_alloc(vm_region_jar, GFP_KERNEL); if (!region) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1521 |
|
8feae1311 NOMMU: Make VMAs ... |
1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 |
new = kmem_cache_alloc(vm_area_cachep, GFP_KERNEL); if (!new) { kmem_cache_free(vm_region_jar, region); return -ENOMEM; } /* most fields are the same, copy all, and then fixup */ *new = *vma; *region = *vma->vm_region; new->vm_region = region; npages = (addr - vma->vm_start) >> PAGE_SHIFT; if (new_below) { |
dd8632a12 NOMMU: Make mmap ... |
1536 |
region->vm_top = region->vm_end = new->vm_end = addr; |
8feae1311 NOMMU: Make VMAs ... |
1537 1538 1539 |
} else { region->vm_start = new->vm_start = addr; region->vm_pgoff = new->vm_pgoff += npages; |
1da177e4c Linux-2.6.12-rc2 |
1540 |
} |
8feae1311 NOMMU: Make VMAs ... |
1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 |
if (new->vm_ops && new->vm_ops->open) new->vm_ops->open(new); delete_vma_from_mm(vma); down_write(&nommu_region_sem); delete_nommu_region(vma->vm_region); if (new_below) { vma->vm_region->vm_start = vma->vm_start = addr; vma->vm_region->vm_pgoff = vma->vm_pgoff += npages; } else { vma->vm_region->vm_end = vma->vm_end = addr; |
dd8632a12 NOMMU: Make mmap ... |
1553 |
vma->vm_region->vm_top = addr; |
8feae1311 NOMMU: Make VMAs ... |
1554 1555 1556 1557 1558 1559 1560 |
} add_nommu_region(vma->vm_region); add_nommu_region(new->vm_region); up_write(&nommu_region_sem); add_vma_to_mm(mm, vma); add_vma_to_mm(mm, new); return 0; |
1da177e4c Linux-2.6.12-rc2 |
1561 |
} |
3034097a5 [PATCH] NOMMU: Or... |
1562 |
/* |
8feae1311 NOMMU: Make VMAs ... |
1563 1564 |
* shrink a VMA by removing the specified chunk from either the beginning or * the end |
3034097a5 [PATCH] NOMMU: Or... |
1565 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
1566 1567 1568 |
static int shrink_vma(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long from, unsigned long to) |
1da177e4c Linux-2.6.12-rc2 |
1569 |
{ |
8feae1311 NOMMU: Make VMAs ... |
1570 |
struct vm_region *region; |
1da177e4c Linux-2.6.12-rc2 |
1571 |
|
8feae1311 NOMMU: Make VMAs ... |
1572 |
kenter(""); |
1da177e4c Linux-2.6.12-rc2 |
1573 |
|
8feae1311 NOMMU: Make VMAs ... |
1574 1575 1576 1577 1578 1579 1580 1581 |
/* adjust the VMA's pointers, which may reposition it in the MM's tree * and list */ delete_vma_from_mm(vma); if (from > vma->vm_start) vma->vm_end = from; else vma->vm_start = to; add_vma_to_mm(mm, vma); |
1da177e4c Linux-2.6.12-rc2 |
1582 |
|
8feae1311 NOMMU: Make VMAs ... |
1583 1584 |
/* cut the backing region down to size */ region = vma->vm_region; |
1e2ae599d nommu: struct vm_... |
1585 |
BUG_ON(region->vm_usage != 1); |
8feae1311 NOMMU: Make VMAs ... |
1586 1587 1588 |
down_write(&nommu_region_sem); delete_nommu_region(region); |
dd8632a12 NOMMU: Make mmap ... |
1589 1590 1591 1592 |
if (from > region->vm_start) { to = region->vm_top; region->vm_top = region->vm_end = from; } else { |
8feae1311 NOMMU: Make VMAs ... |
1593 |
region->vm_start = to; |
dd8632a12 NOMMU: Make mmap ... |
1594 |
} |
8feae1311 NOMMU: Make VMAs ... |
1595 1596 1597 1598 1599 1600 |
add_nommu_region(region); up_write(&nommu_region_sem); free_page_series(from, to); return 0; } |
1da177e4c Linux-2.6.12-rc2 |
1601 |
|
8feae1311 NOMMU: Make VMAs ... |
1602 1603 1604 1605 1606 1607 1608 1609 |
/* * release a mapping * - under NOMMU conditions the chunk to be unmapped must be backed by a single * VMA, though it need not cover the whole VMA */ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len) { struct vm_area_struct *vma; |
f67d9b157 nommu: add page a... |
1610 |
unsigned long end; |
8feae1311 NOMMU: Make VMAs ... |
1611 |
int ret; |
1da177e4c Linux-2.6.12-rc2 |
1612 |
|
8feae1311 NOMMU: Make VMAs ... |
1613 |
kenter(",%lx,%zx", start, len); |
1da177e4c Linux-2.6.12-rc2 |
1614 |
|
f67d9b157 nommu: add page a... |
1615 |
len = PAGE_ALIGN(len); |
8feae1311 NOMMU: Make VMAs ... |
1616 1617 |
if (len == 0) return -EINVAL; |
365e9c87a [PATCH] mm: updat... |
1618 |
|
f67d9b157 nommu: add page a... |
1619 |
end = start + len; |
8feae1311 NOMMU: Make VMAs ... |
1620 1621 1622 |
/* find the first potentially overlapping VMA */ vma = find_vma(mm, start); if (!vma) { |
ac7149045 mm: fix 'ERROR: d... |
1623 |
static int limit; |
33e5d7697 nommu: fix a numb... |
1624 1625 1626 1627 1628 1629 1630 1631 1632 |
if (limit < 5) { printk(KERN_WARNING "munmap of memory not mmapped by process %d" " (%s): 0x%lx-0x%lx ", current->pid, current->comm, start, start + len - 1); limit++; } |
8feae1311 NOMMU: Make VMAs ... |
1633 1634 |
return -EINVAL; } |
1da177e4c Linux-2.6.12-rc2 |
1635 |
|
8feae1311 NOMMU: Make VMAs ... |
1636 1637 1638 1639 1640 1641 1642 1643 1644 |
/* we're allowed to split an anonymous VMA but not a file-backed one */ if (vma->vm_file) { do { if (start > vma->vm_start) { kleave(" = -EINVAL [miss]"); return -EINVAL; } if (end == vma->vm_end) goto erase_whole_vma; |
d75a310c4 mm: nommu: check ... |
1645 1646 |
vma = vma->vm_next; } while (vma); |
8feae1311 NOMMU: Make VMAs ... |
1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 |
kleave(" = -EINVAL [split file]"); return -EINVAL; } else { /* the chunk must be a subset of the VMA found */ if (start == vma->vm_start && end == vma->vm_end) goto erase_whole_vma; if (start < vma->vm_start || end > vma->vm_end) { kleave(" = -EINVAL [superset]"); return -EINVAL; } if (start & ~PAGE_MASK) { kleave(" = -EINVAL [unaligned start]"); return -EINVAL; } if (end != vma->vm_end && end & ~PAGE_MASK) { kleave(" = -EINVAL [unaligned split]"); return -EINVAL; } if (start != vma->vm_start && end != vma->vm_end) { ret = split_vma(mm, vma, start, 1); if (ret < 0) { kleave(" = %d [split]", ret); return ret; } } return shrink_vma(mm, vma, start, end); } |
1da177e4c Linux-2.6.12-rc2 |
1674 |
|
8feae1311 NOMMU: Make VMAs ... |
1675 1676 1677 1678 |
erase_whole_vma: delete_vma_from_mm(vma); delete_vma(mm, vma); kleave(" = 0"); |
1da177e4c Linux-2.6.12-rc2 |
1679 1680 |
return 0; } |
b50731732 nommu: vmalloc_32... |
1681 |
EXPORT_SYMBOL(do_munmap); |
1da177e4c Linux-2.6.12-rc2 |
1682 |
|
bfce281c2 kill mm argument ... |
1683 |
int vm_munmap(unsigned long addr, size_t len) |
3034097a5 [PATCH] NOMMU: Or... |
1684 |
{ |
bfce281c2 kill mm argument ... |
1685 |
struct mm_struct *mm = current->mm; |
3034097a5 [PATCH] NOMMU: Or... |
1686 |
int ret; |
3034097a5 [PATCH] NOMMU: Or... |
1687 1688 1689 1690 1691 1692 |
down_write(&mm->mmap_sem); ret = do_munmap(mm, addr, len); up_write(&mm->mmap_sem); return ret; } |
a46ef99d8 VM: add "vm_munma... |
1693 1694 1695 1696 |
EXPORT_SYMBOL(vm_munmap); SYSCALL_DEFINE2(munmap, unsigned long, addr, size_t, len) { |
bfce281c2 kill mm argument ... |
1697 |
return vm_munmap(addr, len); |
a46ef99d8 VM: add "vm_munma... |
1698 |
} |
3034097a5 [PATCH] NOMMU: Or... |
1699 1700 |
/* |
8feae1311 NOMMU: Make VMAs ... |
1701 |
* release all the mappings made in a process's VM space |
3034097a5 [PATCH] NOMMU: Or... |
1702 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
1703 |
void exit_mmap(struct mm_struct *mm) |
1da177e4c Linux-2.6.12-rc2 |
1704 |
{ |
8feae1311 NOMMU: Make VMAs ... |
1705 |
struct vm_area_struct *vma; |
1da177e4c Linux-2.6.12-rc2 |
1706 |
|
8feae1311 NOMMU: Make VMAs ... |
1707 1708 |
if (!mm) return; |
1da177e4c Linux-2.6.12-rc2 |
1709 |
|
8feae1311 NOMMU: Make VMAs ... |
1710 |
kenter(""); |
1da177e4c Linux-2.6.12-rc2 |
1711 |
|
8feae1311 NOMMU: Make VMAs ... |
1712 |
mm->total_vm = 0; |
1da177e4c Linux-2.6.12-rc2 |
1713 |
|
8feae1311 NOMMU: Make VMAs ... |
1714 1715 1716 1717 |
while ((vma = mm->mmap)) { mm->mmap = vma->vm_next; delete_vma_from_mm(vma); delete_vma(mm, vma); |
04c349615 nommu: yield CPU ... |
1718 |
cond_resched(); |
1da177e4c Linux-2.6.12-rc2 |
1719 |
} |
8feae1311 NOMMU: Make VMAs ... |
1720 1721 |
kleave(""); |
1da177e4c Linux-2.6.12-rc2 |
1722 |
} |
e4eb1ff61 VM: add "vm_brk()... |
1723 |
unsigned long vm_brk(unsigned long addr, unsigned long len) |
1da177e4c Linux-2.6.12-rc2 |
1724 1725 1726 1727 1728 |
{ return -ENOMEM; } /* |
6fa5f80bc [PATCH] NOMMU: Ma... |
1729 1730 |
* 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 |
1731 |
* |
6fa5f80bc [PATCH] NOMMU: Ma... |
1732 |
* under NOMMU conditions, we only permit changing a mapping's size, and only |
8feae1311 NOMMU: Make VMAs ... |
1733 1734 |
* as long as it stays within the region allocated by do_mmap_private() and the * block is not shareable |
1da177e4c Linux-2.6.12-rc2 |
1735 |
* |
6fa5f80bc [PATCH] NOMMU: Ma... |
1736 |
* MREMAP_FIXED is not supported under NOMMU conditions |
1da177e4c Linux-2.6.12-rc2 |
1737 |
*/ |
4b377bab2 make do_mremap() ... |
1738 |
static unsigned long do_mremap(unsigned long addr, |
1da177e4c Linux-2.6.12-rc2 |
1739 1740 1741 |
unsigned long old_len, unsigned long new_len, unsigned long flags, unsigned long new_addr) { |
6fa5f80bc [PATCH] NOMMU: Ma... |
1742 |
struct vm_area_struct *vma; |
1da177e4c Linux-2.6.12-rc2 |
1743 1744 |
/* insanity checks first */ |
f67d9b157 nommu: add page a... |
1745 1746 |
old_len = PAGE_ALIGN(old_len); new_len = PAGE_ALIGN(new_len); |
8feae1311 NOMMU: Make VMAs ... |
1747 |
if (old_len == 0 || new_len == 0) |
1da177e4c Linux-2.6.12-rc2 |
1748 |
return (unsigned long) -EINVAL; |
8feae1311 NOMMU: Make VMAs ... |
1749 1750 |
if (addr & ~PAGE_MASK) return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
1751 1752 |
if (flags & MREMAP_FIXED && new_addr != addr) return (unsigned long) -EINVAL; |
8feae1311 NOMMU: Make VMAs ... |
1753 |
vma = find_vma_exact(current->mm, addr, old_len); |
6fa5f80bc [PATCH] NOMMU: Ma... |
1754 1755 |
if (!vma) return (unsigned long) -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
1756 |
|
6fa5f80bc [PATCH] NOMMU: Ma... |
1757 |
if (vma->vm_end != vma->vm_start + old_len) |
1da177e4c Linux-2.6.12-rc2 |
1758 |
return (unsigned long) -EFAULT; |
6fa5f80bc [PATCH] NOMMU: Ma... |
1759 |
if (vma->vm_flags & VM_MAYSHARE) |
1da177e4c Linux-2.6.12-rc2 |
1760 |
return (unsigned long) -EPERM; |
8feae1311 NOMMU: Make VMAs ... |
1761 |
if (new_len > vma->vm_region->vm_end - vma->vm_region->vm_start) |
1da177e4c Linux-2.6.12-rc2 |
1762 1763 1764 |
return (unsigned long) -ENOMEM; /* all checks complete - do it */ |
6fa5f80bc [PATCH] NOMMU: Ma... |
1765 |
vma->vm_end = vma->vm_start + new_len; |
6fa5f80bc [PATCH] NOMMU: Ma... |
1766 1767 |
return vma->vm_start; } |
6a6160a7b [CVE-2009-0029] S... |
1768 1769 1770 |
SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len, unsigned long, new_len, unsigned long, flags, unsigned long, new_addr) |
6fa5f80bc [PATCH] NOMMU: Ma... |
1771 1772 1773 1774 1775 1776 1777 |
{ 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 |
1778 |
} |
240aadeed mm: accelerate mm... |
1779 1780 1781 |
struct page *follow_page_mask(struct vm_area_struct *vma, unsigned long address, unsigned int flags, unsigned int *page_mask) |
1da177e4c Linux-2.6.12-rc2 |
1782 |
{ |
240aadeed mm: accelerate mm... |
1783 |
*page_mask = 0; |
1da177e4c Linux-2.6.12-rc2 |
1784 1785 |
return NULL; } |
8f3b1327a mm/nommu.c: fix r... |
1786 1787 |
int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr, unsigned long pfn, unsigned long size, pgprot_t prot) |
1da177e4c Linux-2.6.12-rc2 |
1788 |
{ |
8f3b1327a mm/nommu.c: fix r... |
1789 1790 |
if (addr != (pfn << PAGE_SHIFT)) return -EINVAL; |
314e51b98 mm: kill vma flag... |
1791 |
vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP; |
66aa2b4b1 [PATCH] uclinux: ... |
1792 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
1793 |
} |
22c4af409 [PATCH] nommu: ex... |
1794 |
EXPORT_SYMBOL(remap_pfn_range); |
1da177e4c Linux-2.6.12-rc2 |
1795 |
|
3c0b9de6d vm: add no-mmu vm... |
1796 1797 1798 1799 1800 1801 1802 1803 1804 |
int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len) { unsigned long pfn = start >> PAGE_SHIFT; unsigned long vm_len = vma->vm_end - vma->vm_start; pfn += vma->vm_pgoff; return io_remap_pfn_range(vma, vma->vm_start, pfn, vm_len, vma->vm_page_prot); } EXPORT_SYMBOL(vm_iomap_memory); |
f905bc447 nommu: add new vm... |
1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 |
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 |
1819 1820 1821 1822 1823 |
unsigned long arch_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) { return -ENOMEM; } |
1da177e4c Linux-2.6.12-rc2 |
1824 1825 1826 1827 1828 |
void unmap_mapping_range(struct address_space *mapping, loff_t const holebegin, loff_t const holelen, int even_cows) { } |
22c4af409 [PATCH] nommu: ex... |
1829 |
EXPORT_SYMBOL(unmap_mapping_range); |
1da177e4c Linux-2.6.12-rc2 |
1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 |
/* * 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 ... |
1847 |
int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin) |
1da177e4c Linux-2.6.12-rc2 |
1848 |
{ |
8138a67a5 mm/nommu.c: fix a... |
1849 |
long free, allowed, reserve; |
1da177e4c Linux-2.6.12-rc2 |
1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 |
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) { |
c15bef309 mmap: fix and tid... |
1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 |
free = global_page_state(NR_FREE_PAGES); free += global_page_state(NR_FILE_PAGES); /* * shmem pages shouldn't be counted as free in this * case, they can't be purged, only swapped out, and * that won't affect the overall amount of available * memory in the system. */ free -= global_page_state(NR_SHMEM); |
1da177e4c Linux-2.6.12-rc2 |
1870 |
|
ec8acf20a swap: add per-par... |
1871 |
free += get_nr_swap_pages(); |
1da177e4c Linux-2.6.12-rc2 |
1872 1873 1874 1875 1876 1877 1878 |
/* * 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... |
1879 |
free += global_page_state(NR_SLAB_RECLAIMABLE); |
1da177e4c Linux-2.6.12-rc2 |
1880 1881 |
/* |
d5ddc79bc [PATCH] overcommi... |
1882 1883 |
* Leave reserved pages. The pages are not for anonymous pages. */ |
c15bef309 mmap: fix and tid... |
1884 |
if (free <= totalreserve_pages) |
d5ddc79bc [PATCH] overcommi... |
1885 1886 |
goto error; else |
c15bef309 mmap: fix and tid... |
1887 |
free -= totalreserve_pages; |
d5ddc79bc [PATCH] overcommi... |
1888 1889 |
/* |
4eeab4f55 mm: replace hardc... |
1890 |
* Reserve some for root |
d5ddc79bc [PATCH] overcommi... |
1891 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1892 |
if (!cap_sys_admin) |
4eeab4f55 mm: replace hardc... |
1893 |
free -= sysctl_admin_reserve_kbytes >> (PAGE_SHIFT - 10); |
1da177e4c Linux-2.6.12-rc2 |
1894 1895 1896 |
if (free > pages) return 0; |
d5ddc79bc [PATCH] overcommi... |
1897 1898 |
goto error; |
1da177e4c Linux-2.6.12-rc2 |
1899 |
} |
00619bcc4 mm: factor commit... |
1900 |
allowed = vm_commit_limit(); |
1da177e4c Linux-2.6.12-rc2 |
1901 |
/* |
4eeab4f55 mm: replace hardc... |
1902 |
* Reserve some 3% for root |
1da177e4c Linux-2.6.12-rc2 |
1903 1904 |
*/ if (!cap_sys_admin) |
4eeab4f55 mm: replace hardc... |
1905 |
allowed -= sysctl_admin_reserve_kbytes >> (PAGE_SHIFT - 10); |
1da177e4c Linux-2.6.12-rc2 |
1906 |
|
c9b1d0981 mm: limit growth ... |
1907 1908 1909 1910 1911 |
/* * Don't let a single process grow so big a user can't recover */ if (mm) { reserve = sysctl_user_reserve_kbytes >> (PAGE_SHIFT - 10); |
8138a67a5 mm/nommu.c: fix a... |
1912 |
allowed -= min_t(long, mm->total_vm / 32, reserve); |
c9b1d0981 mm: limit growth ... |
1913 |
} |
1da177e4c Linux-2.6.12-rc2 |
1914 |
|
00a62ce91 mm: fix Committed... |
1915 |
if (percpu_counter_read_positive(&vm_committed_as) < allowed) |
1da177e4c Linux-2.6.12-rc2 |
1916 |
return 0; |
00a62ce91 mm: fix Committed... |
1917 |
|
d5ddc79bc [PATCH] overcommi... |
1918 |
error: |
1da177e4c Linux-2.6.12-rc2 |
1919 1920 1921 1922 |
vm_unacct_memory(pages); return -ENOMEM; } |
d0217ac04 mm: fault feedbac... |
1923 |
int filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
b0e15190e [PATCH] NOMMU: Ma... |
1924 1925 |
{ BUG(); |
d0217ac04 mm: fault feedbac... |
1926 |
return 0; |
b0e15190e [PATCH] NOMMU: Ma... |
1927 |
} |
b50731732 nommu: vmalloc_32... |
1928 |
EXPORT_SYMBOL(filemap_fault); |
0ec76a110 [PATCH] NOMMU: Ch... |
1929 |
|
f1820361f mm: implement ->m... |
1930 1931 1932 1933 1934 |
void filemap_map_pages(struct vm_area_struct *vma, struct vm_fault *vmf) { BUG(); } EXPORT_SYMBOL(filemap_map_pages); |
f55f199b7 NOMMU: implement ... |
1935 1936 |
static int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm, unsigned long addr, void *buf, int len, int write) |
0ec76a110 [PATCH] NOMMU: Ch... |
1937 |
{ |
0ec76a110 [PATCH] NOMMU: Ch... |
1938 |
struct vm_area_struct *vma; |
0ec76a110 [PATCH] NOMMU: Ch... |
1939 1940 1941 1942 |
down_read(&mm->mmap_sem); /* the access must start within one of the target process's mappings */ |
0159b141d [PATCH] NOMMU: Us... |
1943 1944 |
vma = find_vma(mm, addr); if (vma) { |
0ec76a110 [PATCH] NOMMU: Ch... |
1945 1946 1947 1948 1949 |
/* 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... |
1950 |
if (write && vma->vm_flags & VM_MAYWRITE) |
7959722b9 NOMMU: Use copy_*... |
1951 1952 |
copy_to_user_page(vma, NULL, addr, (void *) addr, buf, len); |
d00c7b993 [PATCH] NOMMU: Pe... |
1953 |
else if (!write && vma->vm_flags & VM_MAYREAD) |
7959722b9 NOMMU: Use copy_*... |
1954 1955 |
copy_from_user_page(vma, NULL, addr, buf, (void *) addr, len); |
0ec76a110 [PATCH] NOMMU: Ch... |
1956 1957 1958 1959 1960 1961 1962 |
else len = 0; } else { len = 0; } up_read(&mm->mmap_sem); |
f55f199b7 NOMMU: implement ... |
1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 |
return len; } /** * @access_remote_vm - access another process' address space * @mm: the mm_struct of the target address space * @addr: start address to access * @buf: source or destination buffer * @len: number of bytes to transfer * @write: whether the access is a write * * The caller must hold a reference on @mm. */ int access_remote_vm(struct mm_struct *mm, unsigned long addr, void *buf, int len, int write) { return __access_remote_vm(NULL, mm, addr, buf, len, write); } /* * 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) { struct mm_struct *mm; if (addr + len < addr) return 0; mm = get_task_mm(tsk); if (!mm) return 0; len = __access_remote_vm(tsk, mm, addr, buf, len, write); |
0ec76a110 [PATCH] NOMMU: Ch... |
1999 2000 2001 |
mmput(mm); return len; } |
7e6608724 nommu: fix shared... |
2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 |
/** * nommu_shrink_inode_mappings - Shrink the shared mappings on an inode * @inode: The inode to check * @size: The current filesize of the inode * @newsize: The proposed filesize of the inode * * Check the shared mappings on an inode on behalf of a shrinking truncate to * make sure that that any outstanding VMAs aren't broken and then shrink the * vm_regions that extend that beyond so that do_mmap_pgoff() doesn't * automatically grant mappings that are too large. */ int nommu_shrink_inode_mappings(struct inode *inode, size_t size, size_t newsize) { struct vm_area_struct *vma; |
7e6608724 nommu: fix shared... |
2018 2019 2020 2021 2022 2023 2024 2025 |
struct vm_region *region; pgoff_t low, high; size_t r_size, r_top; low = newsize >> PAGE_SHIFT; high = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; down_write(&nommu_region_sem); |
1acf2e040 mm/nommu: share t... |
2026 |
i_mmap_lock_read(inode->i_mapping); |
7e6608724 nommu: fix shared... |
2027 2028 |
/* search for VMAs that fall within the dead zone */ |
6b2dbba8b mm: replace vma p... |
2029 |
vma_interval_tree_foreach(vma, &inode->i_mapping->i_mmap, low, high) { |
7e6608724 nommu: fix shared... |
2030 2031 2032 |
/* found one - only interested if it's shared out of the page * cache */ if (vma->vm_flags & VM_SHARED) { |
1acf2e040 mm/nommu: share t... |
2033 |
i_mmap_unlock_read(inode->i_mapping); |
7e6608724 nommu: fix shared... |
2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 |
up_write(&nommu_region_sem); return -ETXTBSY; /* not quite true, but near enough */ } } /* reduce any regions that overlap the dead zone - if in existence, * these will be pointed to by VMAs that don't overlap the dead zone * * we don't check for any regions that start beyond the EOF as there * shouldn't be any */ |
1acf2e040 mm/nommu: share t... |
2045 |
vma_interval_tree_foreach(vma, &inode->i_mapping->i_mmap, 0, ULONG_MAX) { |
7e6608724 nommu: fix shared... |
2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 |
if (!(vma->vm_flags & VM_SHARED)) continue; region = vma->vm_region; r_size = region->vm_top - region->vm_start; r_top = (region->vm_pgoff << PAGE_SHIFT) + r_size; if (r_top > newsize) { region->vm_top -= r_top - newsize; if (region->vm_end > region->vm_top) region->vm_end = region->vm_top; } } |
1acf2e040 mm/nommu: share t... |
2059 |
i_mmap_unlock_read(inode->i_mapping); |
7e6608724 nommu: fix shared... |
2060 2061 2062 |
up_write(&nommu_region_sem); return 0; } |
c9b1d0981 mm: limit growth ... |
2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 |
/* * Initialise sysctl_user_reserve_kbytes. * * This is intended to prevent a user from starting a single memory hogging * process, such that they cannot recover (kill the hog) in OVERCOMMIT_NEVER * mode. * * The default value is min(3% of free memory, 128MB) * 128MB is enough to recover with sshd/login, bash, and top/kill. */ static int __meminit init_user_reserve(void) { unsigned long free_kbytes; free_kbytes = global_page_state(NR_FREE_PAGES) << (PAGE_SHIFT - 10); sysctl_user_reserve_kbytes = min(free_kbytes / 32, 1UL << 17); return 0; } module_init(init_user_reserve) |
4eeab4f55 mm: replace hardc... |
2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 |
/* * Initialise sysctl_admin_reserve_kbytes. * * The purpose of sysctl_admin_reserve_kbytes is to allow the sys admin * to log in and kill a memory hogging process. * * Systems with more than 256MB will reserve 8MB, enough to recover * with sshd, bash, and top in OVERCOMMIT_GUESS. Smaller systems will * only reserve 3% of free pages by default. */ static int __meminit init_admin_reserve(void) { unsigned long free_kbytes; free_kbytes = global_page_state(NR_FREE_PAGES) << (PAGE_SHIFT - 10); sysctl_admin_reserve_kbytes = min(free_kbytes / 32, 1UL << 13); return 0; } module_init(init_admin_reserve) |