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| author | Oleg Nesterov <oleg@redhat.com> | 2015-11-06 03:48:14 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-11-06 04:34:48 +0100 |
| commit | 87e8827b37c0c391d9915d0dc6a06c9b5f9cac65 (patch) | |
| tree | 9164f29c1f758212177668b95eb3363bda501240 /mm/Kconfig | |
| parent | mm: fix overflow in find_zone_movable_pfns_for_nodes() (diff) | |
| download | linux-87e8827b37c0c391d9915d0dc6a06c9b5f9cac65.tar.xz linux-87e8827b37c0c391d9915d0dc6a06c9b5f9cac65.zip | |
mm: fix the racy mm->locked_vm change in
"mm->locked_vm += grow" and vm_stat_account() in acct_stack_growth() are
not safe; multiple threads using the same ->mm can do this at the same
time trying to expans different vma's under down_read(mmap_sem). This
means that one of the "locked_vm += grow" changes can be lost and we can
miss munlock_vma_pages_all() later.
Move this code into the caller(s) under mm->page_table_lock. All other
updates to ->locked_vm hold mmap_sem for writing.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Hugh Dickins <hughd@google.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/Kconfig')
0 files changed, 0 insertions, 0 deletions