linux-kernel - Re: [PATCH 3/3] perf, x86, lbr: Demand proper privileges for PERF_SAMPLE_BRANCH

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Message-ID: <20130503144157.GQ19487@tassilo.jf.intel.com>
Date:	Fri, 3 May 2013 07:41:57 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	mingo@...nel.org, linux-kernel@...r.kernel.org, eranian@...gle.com
Subject: Re: [PATCH 3/3] perf, x86, lbr: Demand proper privileges for
 PERF_SAMPLE_BRANCH_KERNEL

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 <ak@...ux.intel.com>

Acked-by: Andi Kleen <ak@...ux.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 */
>  
> 
> 

-- 
ak@...ux.intel.com -- Speaking for myself only
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