linux-kernel - Re: [PATCH] x86,seccomp,prctl: Remove PR_TSC

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Message-ID: <20141003210428.GH6324@worktop.programming.kicks-ass.net>
Date:	Fri, 3 Oct 2014 23:04:28 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Kees Cook <keescook@...omium.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Erik Bosman <ebn310@....vu.nl>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linux API <linux-api@...r.kernel.org>,
	Michael Kerrisk-manpages <mtk.manpages@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	X86 ML <x86@...nel.org>
Subject: Re: [PATCH] x86,seccomp,prctl: Remove PR_TSC_SIGSEGV and seccomp TSC
 filtering

On Fri, Oct 03, 2014 at 11:02:13PM +0200, Peter Zijlstra wrote:
> @@ -1928,7 +1939,7 @@ void arch_perf_update_userpage(struct perf_event_mmap_page *userpg, u64 now)
>  
>  	userpg->cap_user_time = 0;
>  	userpg->cap_user_time_zero = 0;
> -	userpg->cap_user_rdpmc = x86_pmu.attr_rdpmc;
> +	userpg->cap_user_rdpmc = x86_pmu.attr_rdpmc && test_thread_flag(TIF_SECCOMP);

&& !test_thread_flag(TIF_SECCOMP) would probably work better

>  	userpg->pmc_width = x86_pmu.cntval_bits;
>  
>  	if (!sched_clock_stable())
--
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