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author | Aaron Lu <aaron.lu@intel.com> | 2016-11-29 08:27:31 +0300 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-11-29 19:20:24 +0300 |
commit | a2ce2666aa3509ac31fac0f540a3502372b7b630 (patch) | |
tree | 10b193706622c09b1b23c540359de7d75557a5a7 /ipc/syscall.c | |
parent | 88abd8249ee8bcebb98c90e890ea5e342db832af (diff) | |
download | linux-a2ce2666aa3509ac31fac0f540a3502372b7b630.tar.xz |
mremap: move_ptes: check pte dirty after its removal
Linus found there still is a race in mremap after commit 5d1904204c99
("mremap: fix race between mremap() and page cleanning").
As described by Linus:
"the issue is that another thread might make the pte be dirty (in the
hardware walker, so no locking of ours will make any difference)
*after* we checked whether it was dirty, but *before* we removed it
from the page tables"
Fix it by moving the check after we removed it from the page table.
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc/syscall.c')
0 files changed, 0 insertions, 0 deletions