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| author | Aaron Lu <[email protected]> | 2016-11-29 05:27:31 +0000 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2016-11-29 16:20:24 +0000 |
| commit | a2ce2666aa3509ac31fac0f540a3502372b7b630 (patch) | |
| tree | 10b193706622c09b1b23c540359de7d75557a5a7 /lib/debugobjects.c | |
| parent | Merge branch 'for-4.9-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git... (diff) | |
| download | kernel-a2ce2666aa3509ac31fac0f540a3502372b7b630.tar.gz kernel-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 <[email protected]>
Signed-off-by: Aaron Lu <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Diffstat (limited to 'lib/debugobjects.c')
0 files changed, 0 insertions, 0 deletions