mprotect.c (f01387d2693813eb5271a3448e6a082322c7d75d) mprotect.c (64e455079e1bd7787cc47be30b7f601ce682a5f6)
1/*
2 * mm/mprotect.c
3 *
4 * (C) Copyright 1994 Linus Torvalds
5 * (C) Copyright 2002 Christoph Hellwig
6 *
7 * Address space accounting code <alan@lxorguk.ukuu.org.uk>
8 * (C) Copyright 2002 Red Hat Inc, All Rights Reserved

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24#include <linux/migrate.h>
25#include <linux/perf_event.h>
26#include <linux/ksm.h>
27#include <asm/uaccess.h>
28#include <asm/pgtable.h>
29#include <asm/cacheflush.h>
30#include <asm/tlbflush.h>
31
1/*
2 * mm/mprotect.c
3 *
4 * (C) Copyright 1994 Linus Torvalds
5 * (C) Copyright 2002 Christoph Hellwig
6 *
7 * Address space accounting code <alan@lxorguk.ukuu.org.uk>
8 * (C) Copyright 2002 Red Hat Inc, All Rights Reserved

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24#include <linux/migrate.h>
25#include <linux/perf_event.h>
26#include <linux/ksm.h>
27#include <asm/uaccess.h>
28#include <asm/pgtable.h>
29#include <asm/cacheflush.h>
30#include <asm/tlbflush.h>
31
32#ifndef pgprot_modify
33static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
34{
35 return newprot;
36}
37#endif
38
39/*
40 * For a prot_numa update we only hold mmap_sem for read so there is a
41 * potential race with faulting where a pmd was temporarily none. This
42 * function checks for a transhuge pmd under the appropriate lock. It
43 * returns a pte if it was successfully locked or NULL if it raced with
44 * a transhuge insertion.
45 */
46static pte_t *lock_pte_protection(struct vm_area_struct *vma, pmd_t *pmd,

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88 ptent = ptep_modify_prot_start(mm, addr, pte);
89 if (pte_numa(ptent))
90 ptent = pte_mknonnuma(ptent);
91 ptent = pte_modify(ptent, newprot);
92 /*
93 * Avoid taking write faults for pages we
94 * know to be dirty.
95 */
32/*
33 * For a prot_numa update we only hold mmap_sem for read so there is a
34 * potential race with faulting where a pmd was temporarily none. This
35 * function checks for a transhuge pmd under the appropriate lock. It
36 * returns a pte if it was successfully locked or NULL if it raced with
37 * a transhuge insertion.
38 */
39static pte_t *lock_pte_protection(struct vm_area_struct *vma, pmd_t *pmd,

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81 ptent = ptep_modify_prot_start(mm, addr, pte);
82 if (pte_numa(ptent))
83 ptent = pte_mknonnuma(ptent);
84 ptent = pte_modify(ptent, newprot);
85 /*
86 * Avoid taking write faults for pages we
87 * know to be dirty.
88 */
96 if (dirty_accountable && pte_dirty(ptent))
89 if (dirty_accountable && pte_dirty(ptent) &&
90 (pte_soft_dirty(ptent) ||
91 !(vma->vm_flags & VM_SOFTDIRTY)))
97 ptent = pte_mkwrite(ptent);
98 ptep_modify_prot_commit(mm, addr, pte, ptent);
99 updated = true;
100 } else {
101 struct page *page;
102
103 page = vm_normal_page(vma, addr, oldpte);
104 if (page && !PageKsm(page)) {

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315 }
316
317success:
318 /*
319 * vm_flags and vm_page_prot are protected by the mmap_sem
320 * held in write mode.
321 */
322 vma->vm_flags = newflags;
92 ptent = pte_mkwrite(ptent);
93 ptep_modify_prot_commit(mm, addr, pte, ptent);
94 updated = true;
95 } else {
96 struct page *page;
97
98 page = vm_normal_page(vma, addr, oldpte);
99 if (page && !PageKsm(page)) {

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310 }
311
312success:
313 /*
314 * vm_flags and vm_page_prot are protected by the mmap_sem
315 * held in write mode.
316 */
317 vma->vm_flags = newflags;
323 vma->vm_page_prot = pgprot_modify(vma->vm_page_prot,
324 vm_get_page_prot(newflags));
318 dirty_accountable = vma_wants_writenotify(vma);
319 vma_set_page_prot(vma);
325
320
326 if (vma_wants_writenotify(vma)) {
327 vma->vm_page_prot = vm_get_page_prot(newflags & ~VM_SHARED);
328 dirty_accountable = 1;
329 }
330
331 change_protection(vma, start, end, vma->vm_page_prot,
332 dirty_accountable, 0);
333
334 vm_stat_account(mm, oldflags, vma->vm_file, -nrpages);
335 vm_stat_account(mm, newflags, vma->vm_file, nrpages);
336 perf_event_mmap(vma);
337 return 0;
338

--- 104 unchanged lines hidden --- 		321 change_protection(vma, start, end, vma->vm_page_prot,
322 dirty_accountable, 0);
323
324 vm_stat_account(mm, oldflags, vma->vm_file, -nrpages);
325 vm_stat_account(mm, newflags, vma->vm_file, nrpages);
326 perf_event_mmap(vma);
327 return 0;
328

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