Messages in this thread Patch in this message | | | Date | Fri, 03 May 2013 14:11:25 +0200 | From | Peter Zijlstra <> | Subject | [PATCH 3/3] perf, x86, lbr: Demand proper privileges for PERF_SAMPLE_BRANCH_KERNEL |
| |
We should always have proper privileges when requesting kernel data.
Cc: Andi Kleen <ak@linux.intel.com> Cc: eranian@google.com Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/n/tip-v0x9ky3ahzr6nm3c6ilwrili@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 */
| |