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| author |   John Johansen <john.johansen@canonical.com> | 2019-12-18 11:04:07 -0800 |
|---|---|---|
| committer | John Johansen <john.johansen@canonical.com> | 2020-01-02 05:31:40 -0800 |
| commit | 20d4e80d255dd7cfecb53743bc550ebcad04549d (patch) | |
| tree | c740dec5f800df330c303db8018620b8bb0371f1 /security/apparmor/policy.c | |
| parent | apparmor: fix bind mounts aborting with -ENOMEM (diff) | |
| download | linux-dev-20d4e80d255dd7cfecb53743bc550ebcad04549d.tar.xz linux-dev-20d4e80d255dd7cfecb53743bc550ebcad04549d.zip | |
apparmor: only get a label reference if the fast path check fails
The common fast path check can be done under rcu_read_lock() and
doesn't need a reference count on the label. Only take a reference
count if entering the slow path.
Fixes reported hackbench regression
- sha1 79e178a57dae ("Merge tag 'apparmor-pr-2019-12-03' of
git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor")
hackbench -l (256000/#grp) -g #grp
128 groups 19.679 ±0.90%
- previous sha1 01d1dff64662 ("Merge tag 's390-5.5-2' of
git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux")
hackbench -l (256000/#grp) -g #grp
128 groups 3.1689 ±3.04%
Reported-by: Vincent Guittot <vincent.guittot@linaro.org>
Tested-by: Vincent Guittot <vincent.guittot@linaro.org>
Tested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Fixes: bce4e7e9c45e ("apparmor: reduce rcu_read_lock scope for aa_file_perm mediation")
Signed-off-by: John Johansen <john.johansen@canonical.com>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions