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| author |   Aaron Lu <aaron.lu@intel.com> | 2016-11-29 13:27:31 +0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2016-11-29 08:20:24 -0800 |
| commit | a2ce2666aa3509ac31fac0f540a3502372b7b630 (patch) | |
| tree | 10b193706622c09b1b23c540359de7d75557a5a7 /net/lapb/lapb_subr.c | |
| parent | Merge branch 'for-4.9-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata (diff) | |
| download | linux-dev-a2ce2666aa3509ac31fac0f540a3502372b7b630.tar.xz linux-dev-a2ce2666aa3509ac31fac0f540a3502372b7b630.zip | |
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 'net/lapb/lapb_subr.c')
0 files changed, 0 insertions, 0 deletions