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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-12-12 09:38:42 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-12-12 09:38:42 -0800 |
| commit | f12d5bfceb7e1f9051563381ec047f7f13956c3c (patch) | |
| tree | 5b4eba241978619d763e5ba6209e111299a22bd3 /kernel | |
| parent | 9538e10086bd1301fe915683b1ba0a1de66d7483 (diff) | |
| download | lwn-f12d5bfceb7e1f9051563381ec047f7f13956c3c.tar.gz lwn-f12d5bfceb7e1f9051563381ec047f7f13956c3c.zip | |
futex: fix handling of read-only-mapped hugepages
The hugepage code had the exact same bug that regular pages had in
commit 7485d0d3758e ("futexes: Remove rw parameter from
get_futex_key()").
The regular page case was fixed by commit 9ea71503a8ed ("futex: Fix
regression with read only mappings"), but the transparent hugepage case
(added in a5b338f2b0b1: "thp: update futex compound knowledge") case
remained broken.
Found by Dave Jones and his trinity tool.
Reported-and-tested-by: Dave Jones <davej@fedoraproject.org>
Cc: stable@kernel.org # v2.6.38+
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Darren Hart <dvhart@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/futex.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/futex.c b/kernel/futex.c index 80ba086f021d..02febad00794 100644 --- a/kernel/futex.c +++ b/kernel/futex.c @@ -288,7 +288,7 @@ again: put_page(page); /* serialize against __split_huge_page_splitting() */ local_irq_disable(); - if (likely(__get_user_pages_fast(address, 1, 1, &page) == 1)) { + if (likely(__get_user_pages_fast(address, 1, !ro, &page) == 1)) { page_head = compound_head(page); /* * page_head is valid pointer but we must pin |