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| author | Hugh Dickins <hugh@veritas.com> | 2007-10-22 20:45:12 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-23 08:32:06 -0700 |
| commit | 1ddd439ef987c9f0209e6ce824b67518f2afe67b (patch) | |
| tree | 1f6e0ef40c2b9cf5819d9193d7d06c6a0a33ff6c | |
| parent | 4ae3f847e49e3787eca91bced31f8fd328d50496 (diff) | |
| download | lwn-1ddd439ef987c9f0209e6ce824b67518f2afe67b.tar.gz lwn-1ddd439ef987c9f0209e6ce824b67518f2afe67b.zip | |
fix mprotect vma_wants_writenotify prot
Fix mprotect bug in recent commit 3ed75eb8f1cd89565966599c4f77d2edb086d5b0
(setup vma->vm_page_prot by vm_get_page_prot()): the vma_wants_writenotify
case was setting the same prot as when not.
Nothing wrong with the use of protection_map[] in mmap_region(),
but use vm_get_page_prot() there too in the same ~VM_SHARED way.
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Cc: Coly Li <coyli@suse.de>
Cc: Tony Luck <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/mmap.c | 3 | ||||
| -rw-r--r-- | mm/mprotect.c | 2 |
2 files changed, 2 insertions, 3 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index 7a30c4988231..facc1a75bd4f 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1171,8 +1171,7 @@ munmap_back: vm_flags = vma->vm_flags; if (vma_wants_writenotify(vma)) - vma->vm_page_prot = - protection_map[vm_flags & (VM_READ|VM_WRITE|VM_EXEC)]; + vma->vm_page_prot = vm_get_page_prot(vm_flags & ~VM_SHARED); if (!file || !vma_merge(mm, prev, addr, vma->vm_end, vma->vm_flags, NULL, file, pgoff, vma_policy(vma))) { diff --git a/mm/mprotect.c b/mm/mprotect.c index 55227845abbe..4de546899dc1 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -194,7 +194,7 @@ success: vma->vm_flags = newflags; vma->vm_page_prot = vm_get_page_prot(newflags); if (vma_wants_writenotify(vma)) { - vma->vm_page_prot = vm_get_page_prot(newflags); + vma->vm_page_prot = vm_get_page_prot(newflags & ~VM_SHARED); dirty_accountable = 1; } |