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arm64: perf: fix event validation for software group leaders

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commit ee7538a008 upstream.

This is a port of c95eb3184e ("ARM: 7809/1: perf: fix event validation
for software group leaders") to arm64, which fixes a panic in the arm64
perf backend found as a result of Vince's fuzzing tool.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

(cherry picked from commit 6c6f6c7166)
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Will Deacon
2013-08-20 11:47:40 +01:00
committed by Mark Brown
parent 741dff38f1
commit 4281a11a7e
1 changed files with 3 additions and 0 deletions
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3
arch/arm64/kernel/perf_event.c
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@@ -322,6 +322,9 @@ validate_event(struct pmu_hw_events *hw_events,
struct hw_perf_event fake_event = event->hw;
struct pmu *leader_pmu = event->group_leader->pmu;
if (is_software_event(event))
return 1;
if (event->pmu != leader_pmu || event->state <= PERF_EVENT_STATE_OFF)
return 1;