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author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-04-07 14:35:50 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-04-07 14:35:51 (GMT) |
commit | 982134ba62618c2d69fbbbd166d0a11ee3b7e3d8 (patch) | |
tree | 32aae4719abbd338864ab6faf9e8ebbfc38b1600 /block/blk-sysfs.c | |
parent | 6221f222c0ebf1acdf7abcf927178f40e1a65e2a (diff) | |
download | linux-fsl-qoriq-982134ba62618c2d69fbbbd166d0a11ee3b7e3d8.tar.xz |
mm: avoid wrapping vm_pgoff in mremap()
The normal mmap paths all avoid creating a mapping where the pgoff
inside the mapping could wrap around due to overflow. However, an
expanding mremap() can take such a non-wrapping mapping and make it
bigger and cause a wrapping condition.
Noticed by Robert Swiecki when running a system call fuzzer, where it
caused a BUG_ON() due to terminally confusing the vma_prio_tree code. A
vma dumping patch by Hugh then pinpointed the crazy wrapped case.
Reported-and-tested-by: Robert Swiecki <robert@swiecki.net>
Acked-by: Hugh Dickins <hughd@google.com>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'block/blk-sysfs.c')
0 files changed, 0 insertions, 0 deletions