linux-kernel - Re: [PATCH] Fix infinite loop in ARM user perf

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Message-ID: <20110418104226.GA2820@pulham.picochip.com>
Date:	Mon, 18 Apr 2011 11:42:26 +0100
From:	Jamie Iles <jamie@...ieiles.com>
To:	Sonny Rao <sonnyrao@...omium.org>
Cc:	Jamie Iles <jamie@...ieiles.com>, olofj@...omium.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Russell King <linux@....linux.org.uk>,
	Will Deacon <will.deacon@....com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Fix infinite loop in ARM user perf_event backtrace code

Hi,

On Fri, Apr 15, 2011 at 08:27:25PM -0700, Sonny Rao wrote:
> The ARM user backtrace code can get into an infinite loop if it
> runs into an invalid stack frame which points back to itself.
> This situation has been observed in practice.  Fix it by capping
> the number of entries in the backtrace.  This is also what other
> architectures do in their backtrace code.

Tested on my v6k board and looks good.

> Signed-off-by: Sonny Rao <sonnyrao@...omium.org>

Acked-by: Jamie Iles <jamie@...ieiles.com>

Jamie
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