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| author | David Rientjes <rientjes@google.com> | 2012-06-08 13:21:26 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-06-08 15:07:35 -0700 |
| commit | 1e11ad8dc42975d5c2bab7d478f6cd875602eda4 (patch) | |
| tree | 62e755edfd19ac45cc11b50311ad802907485ff7 | |
| parent | 72494504498ff5ac2f086a83473d4dd1ca490bd3 (diff) | |
| download | lwn-1e11ad8dc42975d5c2bab7d478f6cd875602eda4.tar.gz lwn-1e11ad8dc42975d5c2bab7d478f6cd875602eda4.zip | |
mm, oom: fix badness score underflow
If the privileges given to root threads (3% of allowable memory) or a
negative value of /proc/pid/oom_score_adj happen to exceed the amount of
rss of a thread, its badness score overflows as a result of commit
a7f638f999ff ("mm, oom: normalize oom scores to oom_score_adj scale only
for userspace").
Fix this by making the type signed and return 1, meaning the thread is
still eligible for kill, if the value is negative.
Reported-by: Dave Jones <davej@redhat.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/oom_kill.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/oom_kill.c b/mm/oom_kill.c index ed0e19677360..416637f0e924 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -183,7 +183,7 @@ static bool oom_unkillable_task(struct task_struct *p, unsigned long oom_badness(struct task_struct *p, struct mem_cgroup *memcg, const nodemask_t *nodemask, unsigned long totalpages) { - unsigned long points; + long points; if (oom_unkillable_task(p, memcg, nodemask)) return 0; @@ -223,7 +223,7 @@ unsigned long oom_badness(struct task_struct *p, struct mem_cgroup *memcg, * Never return 0 for an eligible task regardless of the root bonus and * oom_score_adj (oom_score_adj can't be OOM_SCORE_ADJ_MIN here). */ - return points ? points : 1; + return points > 0 ? points : 1; } /* |