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| author | Andrea Arcangeli <aarcange@redhat.com> | 2016-02-06 00:36:13 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-02-06 03:10:40 +0100 |
| commit | acf128d048c76aeaa99646bce3488d73be215f70 (patch) | |
| tree | 73218b1077b2b1b8fed94fe8aca94326a6843b4f /lib | |
| parent | m32r: fix build failure due to SMP and MMU (diff) | |
| download | linux-acf128d048c76aeaa99646bce3488d73be215f70.tar.xz linux-acf128d048c76aeaa99646bce3488d73be215f70.zip | |
mm: validate_mm browse_rb SMP race condition
The mmap_sem for reading in validate_mm called from expand_stack is not
enough to prevent the argumented rbtree rb_subtree_gap information to
change from under us because expand_stack may be running from other
threads concurrently which will hold the mmap_sem for reading too.
The argumented rbtree is updated with vma_gap_update under the
page_table_lock so use it in browse_rb() too to avoid false positives.
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Tested-by: Dmitry Vyukov <dvyukov@google.com>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib')
0 files changed, 0 insertions, 0 deletions