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mm: Clear arch specific VM flags on protection change

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When protection bits are changed on a VMA, some of the architecture
specific flags should be cleared as well. An examples of this are the
PKEY flags on x86. This patch expands the current code that clears
PKEY flags for x86, to support similar functionality for other
architectures as well.

Signed-off-by: Khalid Aziz <khalid.aziz@oracle.com>
Cc: Khalid Aziz <khalid@gonehiking.org>
Reviewed-by: Anthony Yznaga <anthony.yznaga@oracle.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Khalid Aziz
2018-02-21 10:15:50 -07:00
committed by David S. Miller
parent 9035cf9a97
commit 2c2d57b5e7
2 changed files with 7 additions and 1 deletions
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2
mm/mprotect.c
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@@ -475,7 +475,7 @@ static int do_mprotect_pkey(unsigned long start, size_t len,
* cleared from the VMA.
*/
mask_off_old_flags = VM_READ | VM_WRITE | VM_EXEC |
ARCH_VM_PKEY_FLAGS;
VM_FLAGS_CLEAR;
new_vma_pkey = arch_override_mprotect_pkey(vma, prot, pkey);
newflags = calc_vm_prot_bits(prot, new_vma_pkey);