linux-kernel - Re: [PATCH 0/5] perf: Fix tracepoint events permissions check

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Date:	Fri, 11 Jul 2014 14:02:39 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Jiri Olsa <jolsa@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Alexander Yarygin <yarygin@...ux.vnet.ibm.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 0/5] perf: Fix tracepoint events permissions check

On Fri, Jul 11, 2014 at 01:56:17PM +0200, Jiri Olsa wrote:
> hi,
> sending fix for bug reported by Alexander Yarygin in here:
>   http://marc.info/?l=linux-kernel&m=140475133707722&w=2
> 
> The main problem was, that the event_init tracepoint callback
> checked permission of the 'current' task instead of the event
> owner task.
> 
> While this is ok for perf_event_open syscall check, it is wrong
> once event_init is called during fork to create child events.
> In this case the permission of the forked task is checked instead
> of the owner task of the parent event.

also available in here:
  git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
  perf/core_perm

jirka
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