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| author |  Rob Herring <robh@kernel.org>
| 2022-04-08 15:33:30 -0500 |
|---|---|---|
| committer |  Will Deacon <will@kernel.org>
| 2022-04-13 11:48:45 +0100 |
| commit | e5c23779f93d45e39a52758ca593bd7e62e9b4be (patch) | |
| tree | 7ce2cf123703c332a9002a7cf7e542b7a4397b0f /drivers/perf/arm_pmu.c | |
| parent | perf/imx_ddr: Fix undefined behavior due to shift overflowing the constant (diff) | |
| download | linux-e5c23779f93d45e39a52758ca593bd7e62e9b4be.tar.gz linux-e5c23779f93d45e39a52758ca593bd7e62e9b4be.tar.bz2 linux-e5c23779f93d45e39a52758ca593bd7e62e9b4be.zip | |
arm_pmu: Validate single/group leader events
In the case where there is only a cycle counter available (i.e.
PMCR_EL0.N is 0) and an event other than CPU cycles is opened, the open
should fail as the event can never possibly be scheduled. However, the
event validation when an event is opened is skipped when the group
leader is opened. Fix this by always validating the group leader events.
Reported-by: Al Grant <al.grant@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20220408203330.4014015-1-robh@kernel.org
Cc: <stable@vger.kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'drivers/perf/arm_pmu.c')
| -rw-r--r-- | drivers/perf/arm_pmu.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c index 9694370651fa..59d3980b8ca2 100644 --- a/drivers/perf/arm_pmu.c +++ b/drivers/perf/arm_pmu.c @@ -400,6 +400,9 @@ validate_group(struct perf_event *event) if (!validate_event(event->pmu, &fake_pmu, leader)) return -EINVAL; + if (event == leader) + return 0; + for_each_sibling_event(sibling, leader) { if (!validate_event(event->pmu, &fake_pmu, sibling)) return -EINVAL; @@ -489,12 +492,7 @@ __hw_perf_event_init(struct perf_event *event) local64_set(&hwc->period_left, hwc->sample_period); } - if (event->group_leader != event) { - if (validate_group(event) != 0) - return -EINVAL; - } - - return 0; + return validate_group(event); } static int armpmu_event_init(struct perf_event *event) |