[PATCH AUTOSEL 4.9 159/251] perf/ioctl: Add check for the sample_period value

[Sasha Levin]

From: Ravi Bangoria <ravi.bangoria at linux.ibm.com>

[ Upstream commit 913a90bc5a3a06b1f04c337320e9aeee2328dd77 ]

perf_event_open() limits the sample_period to 63 bits. See:

  0819b2e30ccb ("perf: Limit perf_event_attr::sample_period to 63 bits")

Make ioctl() consistent with it.

Also on PowerPC, negative sample_period could cause a recursive
PMIs leading to a hang (reported when running perf-fuzzer).

Signed-off-by: Ravi Bangoria <ravi.bangoria at linux.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz at infradead.org>
Cc: Alexander Shishkin <alexander.shishkin at linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme at redhat.com>
Cc: Jiri Olsa <jolsa at redhat.com>
Cc: Linus Torvalds <torvalds at linux-foundation.org>
Cc: Peter Zijlstra <peterz at infradead.org>
Cc: Stephane Eranian <eranian at google.com>
Cc: Thomas Gleixner <tglx at linutronix.de>
Cc: Vince Weaver <vincent.weaver at maine.edu>
Cc: acme at kernel.org
Cc: linuxppc-dev at lists.ozlabs.org
Cc: maddy at linux.vnet.ibm.com
Cc: mpe at ellerman.id.au
Fixes: 0819b2e30ccb ("perf: Limit perf_event_attr::sample_period to 63 bits")
Link: https://lkml.kernel.org/r/20190604042953.914-1-ravi.bangoria@linux.ibm.com
Signed-off-by: Ingo Molnar <mingo at kernel.org>
Signed-off-by: Sasha Levin <sashal at kernel.org>
---
 kernel/events/core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 5bbf7537a612..64ace5e9af2a 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -4624,6 +4624,9 @@ static int perf_event_period(struct perf_event *event, u64 __user *arg)
 	if (perf_event_check_period(event, value))
 		return -EINVAL;
 
+	if (!event->attr.freq && (value & (1ULL << 63)))
+		return -EINVAL;
+
 	event_function_call(event, __perf_event_period, &value);
 
 	return 0;
-- 
2.20.1