diff options
| author | James Clark <james.clark@linaro.org> | 2024-08-27 15:51:12 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-10-10 12:00:20 +0200 |
| commit | 95425df8814f9864dc03cb66504048a85a525a5f (patch) | |
| tree | 742f8e8debc99117d98db424bc13f4e9e8312c66 /include/linux | |
| parent | eb2589d294bb4027ea701bf4907361a28a186742 (diff) | |
drivers/perf: arm_spe: Use perf_allow_kernel() for permissions
[ Upstream commit 5e9629d0ae977d6f6916d7e519724804e95f0b07 ]
Use perf_allow_kernel() for 'pa_enable' (physical addresses),
'pct_enable' (physical timestamps) and context IDs. This means that
perf_event_paranoid is now taken into account and LSM hooks can be used,
which is more consistent with other perf_event_open calls. For example
PERF_SAMPLE_PHYS_ADDR uses perf_allow_kernel() rather than just
perfmon_capable().
This also indirectly fixes the following error message which is
misleading because perf_event_paranoid is not taken into account by
perfmon_capable():
$ perf record -e arm_spe/pa_enable/
Error:
Access to performance monitoring and observability operations is
limited. Consider adjusting /proc/sys/kernel/perf_event_paranoid
setting ...
Suggested-by: Al Grant <al.grant@arm.com>
Signed-off-by: James Clark <james.clark@linaro.org>
Link: https://lore.kernel.org/r/20240827145113.1224604-1-james.clark@linaro.org
Link: https://lore.kernel.org/all/20240807120039.GD37996@noisy.programming.kicks-ass.net/
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/perf_event.h | 8 |
1 files changed, 1 insertions, 7 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 393fb13733b0..a7f1a3a4d1dc 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -1608,13 +1608,7 @@ static inline int perf_is_paranoid(void) return sysctl_perf_event_paranoid > -1; } -static inline int perf_allow_kernel(struct perf_event_attr *attr) -{ - if (sysctl_perf_event_paranoid > 1 && !perfmon_capable()) - return -EACCES; - - return security_perf_event_open(attr, PERF_SECURITY_KERNEL); -} +int perf_allow_kernel(struct perf_event_attr *attr); static inline int perf_allow_cpu(struct perf_event_attr *attr) { |