Messages in this thread Patch in this message | | | From | Tan Xiaojun <> | Subject | [PATCH -stable 4.1 4/4] perf/core: Fix the perf_cpu_time_max_percent check | Date | Mon, 6 Mar 2017 15:14:25 +0800 |
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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> --- kernel/events/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/events/core.c b/kernel/events/core.c index 350c45a..5b50b06 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -236,7 +236,7 @@ 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; -- 1.9.1
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