lkml.org 
[lkml]   [2013]   [May]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [tip:perf/urgent] perf/x86/intel/lbr: Demand proper privileges for PERF_SAMPLE_BRANCH_KERNEL
On Sat, May 04, 2013 at 01:22:57AM -0700, tip-bot for Peter Zijlstra wrote:
> Commit-ID: 0f5c78b5f33ce940034743e5f9485fc81ad75b0f
> Gitweb: http://git.kernel.org/tip/0f5c78b5f33ce940034743e5f9485fc81ad75b0f
> Author: Peter Zijlstra <a.p.zijlstra@chello.nl>
> AuthorDate: Fri, 3 May 2013 14:11:25 +0200
> Committer: Ingo Molnar <mingo@kernel.org>
> CommitDate: Sat, 4 May 2013 08:37:48 +0200
>
> perf/x86/intel/lbr: Demand proper privileges for PERF_SAMPLE_BRANCH_KERNEL
>
> We should always have proper privileges when requesting kernel
> data.
>
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
> Cc: <stable@kernel.org>
> Cc: Andi Kleen <ak@linux.intel.com>
> Cc: eranian@google.com
> Link: http://lkml.kernel.org/r/20130503121256.230745028@chello.nl
> Signed-off-by: Ingo Molnar <mingo@kernel.org>
> 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(-)
>
> diff --git a/arch/x86/kernel/cpu/perf_event_intel_lbr.c b/arch/x86/kernel/cpu/perf_event_intel_lbr.c
> index de341d4..0e92871 100644
> --- 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_filter(struct perf_event *event)
> 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;

It is probably not too late to amend this patch and remove the "-EACCES":

arch/x86/kernel/cpu/perf_event_intel_lbr.c: In function ‘intel_pmu_setup_sw_lbr_filter’:
arch/x86/kernel/cpu/perf_event_intel_lbr.c:323:4: warning: ‘return’ with a value, in function returning void [enabled by default]

--
Regards/Gruss,
Boris.

Sent from a fat crate under my desk. Formatting is fine.
--
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2013-05-04 13:41    [W:0.112 / U:0.028 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site