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fix mprotect vma_wants_writenotify prot

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Fix mprotect bug in recent commit 3ed75eb8f1
(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 <[email protected]>
Cc: Coly Li <[email protected]>
Cc: Tony Luck <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Hugh Dickins 2007-10-22 20:45:12 -07:00 • committed by Linus Torvalds
commit 1ddd439ef9
2 changed files with 2 additions and 3 deletions
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2
mm/mprotect.c
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@ -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;
}