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| author | Konstantin Khlebnikov | 2019-02-27 09:10:20 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2019-05-31 15:46:19 +0200 |
| commit | 925275d0cc5d3710a4c06b043d5563015595616b (patch) | |
| tree | 165fb3ddabf327be0e2a618686dcfb62473fd558 /kernel/sched | |
| parent | cgroup: protect cgroup->nr_(dying_)descendants by css_set_lock (diff) | |
| download | kernel-qcow2-linux-925275d0cc5d3710a4c06b043d5563015595616b.tar.gz kernel-qcow2-linux-925275d0cc5d3710a4c06b043d5563015595616b.tar.xz kernel-qcow2-linux-925275d0cc5d3710a4c06b043d5563015595616b.zip | |
sched/core: Check quota and period overflow at usec to nsec conversion
[ Upstream commit 1a8b4540db732ca16c9e43ac7c08b1b8f0b252d8 ]
Large values could overflow u64 and pass following sanity checks.
# echo 18446744073750000 > cpu.cfs_period_us
# cat cpu.cfs_period_us
40448
# echo 18446744073750000 > cpu.cfs_quota_us
# cat cpu.cfs_quota_us
40448
After this patch they will fail with -EINVAL.
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/155125502079.293431.3947497929372138600.stgit@buzz
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/core.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index d7f409866cdf..bd5ae34c20c0 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -6593,8 +6593,10 @@ int tg_set_cfs_quota(struct task_group *tg, long cfs_quota_us) period = ktime_to_ns(tg->cfs_bandwidth.period); if (cfs_quota_us < 0) quota = RUNTIME_INF; - else + else if ((u64)cfs_quota_us <= U64_MAX / NSEC_PER_USEC) quota = (u64)cfs_quota_us * NSEC_PER_USEC; + else + return -EINVAL; return tg_set_cfs_bandwidth(tg, period, quota); } @@ -6616,6 +6618,9 @@ int tg_set_cfs_period(struct task_group *tg, long cfs_period_us) { u64 quota, period; + if ((u64)cfs_period_us > U64_MAX / NSEC_PER_USEC) + return -EINVAL; + period = (u64)cfs_period_us * NSEC_PER_USEC; quota = tg->cfs_bandwidth.quota; |