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| author | Tan Xiaojun <tanxiaojun@huawei.com> | 2017-02-23 14:04:39 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-02-24 08:56:33 +0100 |
| commit | 1572e45a924f254d9570093abde46430c3172e3d (patch) | |
| tree | da2db02ffa3c27b9d5d8b26c67773c7b4baf6edb /kernel/events | |
| parent | 7bbba0eb1af34694868d028b80475981f90e6bee (diff) | |
| download | linux-1572e45a924f254d9570093abde46430c3172e3d.tar.gz linux-1572e45a924f254d9570093abde46430c3172e3d.tar.bz2 linux-1572e45a924f254d9570093abde46430c3172e3d.zip | |
perf/core: Fix the perf_cpu_time_max_percent check
Use "proc_dointvec_minmax" instead of "proc_dointvec" to check the input
value from user-space.
If not, we can set a big value and some vars will overflow like
"sysctl_perf_event_sample_rate" which will cause a lot of unexpected
problems.
Signed-off-by: Tan Xiaojun <tanxiaojun@huawei.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: <acme@kernel.org>
Cc: <alexander.shishkin@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Link: http://lkml.kernel.org/r/1487829879-56237-1-git-send-email-tanxiaojun@huawei.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/events')
| -rw-r--r-- | kernel/events/core.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c index d4e3f8d8238b..c1c1cdf0b811 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -455,7 +455,7 @@ int perf_cpu_time_max_percent_handler(struct ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos) { - int ret = proc_dointvec(table, write, buffer, lenp, ppos); + int ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos); if (ret || !write) return ret; |