From b2b45c40882d28c2770f93cb53ed8c145c5925fc Mon Sep 17 00:00:00 2001
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Wed, 2 May 2018 09:43:35 -0700
Subject: [PATCH] 4.9-stable patches

added patches:
	perf-core-fix-the-perf_cpu_time_max_percent-check.patch
---
 ...-the-perf_cpu_time_max_percent-check.patch | 48 +++++++++++++++++++
 queue-4.9/series                              |  1 +
 2 files changed, 49 insertions(+)
 create mode 100644 queue-4.9/perf-core-fix-the-perf_cpu_time_max_percent-check.patch

diff --git a/queue-4.9/perf-core-fix-the-perf_cpu_time_max_percent-check.patch b/queue-4.9/perf-core-fix-the-perf_cpu_time_max_percent-check.patch
new file mode 100644
index 00000000000..3912234e6e8
--- /dev/null
+++ b/queue-4.9/perf-core-fix-the-perf_cpu_time_max_percent-check.patch
@@ -0,0 +1,48 @@
+From 1572e45a924f254d9570093abde46430c3172e3d Mon Sep 17 00:00:00 2001
+From: Tan Xiaojun <tanxiaojun@huawei.com>
+Date: Thu, 23 Feb 2017 14:04:39 +0800
+Subject: perf/core: Fix the perf_cpu_time_max_percent check
+
+From: Tan Xiaojun <tanxiaojun@huawei.com>
+
+commit 1572e45a924f254d9570093abde46430c3172e3d upstream.
+
+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>
+Cc: Guenter Roeck <linux@roeck-us.net>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+
+---
+ kernel/events/core.c |    2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/kernel/events/core.c
++++ b/kernel/events/core.c
+@@ -453,7 +453,7 @@ int perf_cpu_time_max_percent_handler(st
+ 				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;
diff --git a/queue-4.9/series b/queue-4.9/series
index e69de29bb2d..ad4c44ab7a5 100644
--- a/queue-4.9/series
+++ b/queue-4.9/series
@@ -0,0 +1 @@
+perf-core-fix-the-perf_cpu_time_max_percent-check.patch
-- 
2.47.3