tree f61d58e955b3159007ef77513c1c4f1ed2c9ec23
parent 44c81433e8b05dbc85985d939046f10f95901184
author Venki Pallipadi <venkatesh.pallipadi@intel.com> 1210806351 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1210817475 -0700

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>