We should always have proper privileges when requesting kernel data.
Cc: Andi Kleen <a...@linux.intel.com>
Cc: eran...@google.com
Signed-off-by: Peter Zijlstra <a.p.zijls...@chello.nl>
Link: http://lkml.kernel.org/n/tip-v0x9ky3ahzr6nm3c6ilwr...@git.kernel.org
---
arch/x86/kernel/cpu/perf_event_intel_lbr.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/arch/x86/kernel/cpu/perf_event_intel_lbr.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_lbr.c
@@ -318,8 +318,11 @@ static void intel_pmu_setup_sw_lbr_filte
if (br_type & PERF_SAMPLE_BRANCH_USER)
mask |= X86_BR_USER;
- if (br_type & PERF_SAMPLE_BRANCH_KERNEL)
+ if (br_type & PERF_SAMPLE_BRANCH_KERNEL) {
+ if (perf_paranoid_kernel() && !capable(CAP_SYS_ADMIN))
+ return -EACCES;
mask |= X86_BR_KERNEL;
+ }
/* we ignore BRANCH_HV here */
--
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