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author | Greg Thelen <gthelen@google.com> | 2013-02-22 16:36:02 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-23 17:50:23 -0800 |
commit | 49cd0a5c290f99deca3463d16c3c1c7240107889 (patch) | |
tree | 90a7f92f4b48463483644270355006419bd0f9af /Documentation/vm | |
parent | 5f00110f7273f9ff04ac69a5f85bb535a4fd0987 (diff) | |
download | op-kernel-dev-49cd0a5c290f99deca3463d16c3c1c7240107889.zip op-kernel-dev-49cd0a5c290f99deca3463d16c3c1c7240107889.tar.gz |
tmpfs: fix mempolicy object leaks
Fix several mempolicy leaks in the tmpfs mount logic. These leaks are
slow - on the order of one object leaked per mount attempt.
Leak 1 (umount doesn't free mpol allocated in mount):
while true; do
mount -t tmpfs -o mpol=interleave,size=100M nodev /mnt
umount /mnt
done
Leak 2 (errors parsing remount options will leak mpol):
mount -t tmpfs -o size=100M nodev /mnt
while true; do
mount -o remount,mpol=interleave,size=x /mnt 2> /dev/null
done
umount /mnt
Leak 3 (multiple mpol per mount leak mpol):
while true; do
mount -t tmpfs -o mpol=interleave,mpol=interleave,size=100M nodev /mnt
umount /mnt
done
This patch fixes all of the above. I could have broken the patch into
three pieces but is seemed easier to review as one.
[akpm@linux-foundation.org: fix handling of mpol_parse_str() errors, per Hugh]
Signed-off-by: Greg Thelen <gthelen@google.com>
Acked-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/vm')
0 files changed, 0 insertions, 0 deletions