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| author | Venki Pallipadi <venkatesh.pallipadi@intel.com> | 2008-05-14 16:05:51 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-05-14 19:11:15 -0700 |
| commit | 1c12c4cf9411eb130b245fa8d0fbbaf989477c7b (patch) | |
| tree | f61d58e955b3159007ef77513c1c4f1ed2c9ec23 /mm | |
| parent | 44c81433e8b05dbc85985d939046f10f95901184 (diff) | |
| download | lwn-1c12c4cf9411eb130b245fa8d0fbbaf989477c7b.tar.gz lwn-1c12c4cf9411eb130b245fa8d0fbbaf989477c7b.zip | |
mprotect: prevent alteration of the PAT bits
There is a defect in mprotect, which lets the user change the page cache
type bits by-passing the kernel reserve_memtype and free_memtype
wrappers. Fix the problem by not letting mprotect change the PAT bits.
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/mprotect.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/mm/mprotect.c b/mm/mprotect.c index 4de546899dc1..a5bf31c27375 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -26,6 +26,13 @@ #include <asm/cacheflush.h> #include <asm/tlbflush.h> +#ifndef pgprot_modify +static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot) +{ + return newprot; +} +#endif + static void change_pte_range(struct mm_struct *mm, pmd_t *pmd, unsigned long addr, unsigned long end, pgprot_t newprot, int dirty_accountable) @@ -192,7 +199,9 @@ success: * held in write mode. */ vma->vm_flags = newflags; - vma->vm_page_prot = vm_get_page_prot(newflags); + vma->vm_page_prot = pgprot_modify(vma->vm_page_prot, + vm_get_page_prot(newflags)); + if (vma_wants_writenotify(vma)) { vma->vm_page_prot = vm_get_page_prot(newflags & ~VM_SHARED); dirty_accountable = 1; |