On Fri, May 03, 2013 at 02:11:25PM +0200, Peter Zijlstra wrote:
> We should always have proper privileges when requesting kernel data.
>
> Cc: Andi Kleen <a...@linux.intel.com>
Acked-by: Andi Kleen <a...@linux.intel.com>
> --- 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 */
>
>
>
--
a...@linux.intel.com -- Speaking for myself only
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