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In-Reply-To: <1302924445-18557-1-git-send-email-sonnyrao@chromium.org>
References: <1302924445-18557-1-git-send-email-sonnyrao@chromium.org>
Date: Mon, 18 Apr 2011 11:31:09 -0700
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Message-ID: <BANLkTikwJzOXJGM4pcKmxVdP_2yb9uyeag@mail.gmail.com>
Subject: Re: [PATCH] Fix infinite loop in ARM user perf_event backtrace code
From: Olof Johansson <olofj@chromium.org>
To: Sonny Rao <sonnyrao@chromium.org>
Cc: Jamie Iles <jamie@jamieiles.com>, Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Paul Mackerras <paulus@samba.org>, Ingo Molnar <mingo@elte.hu>,
        Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
        Russell King <linux@arm.linux.org.uk>,
        Will Deacon <will.deacon@arm.com>,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
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On Fri, Apr 15, 2011 at 8:27 PM, Sonny Rao <sonnyrao@chromium.org> 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.
>
> Signed-off-by: Sonny Rao <sonnyrao@chromium.org>

Acked-by: Olof Johansson <olof@lixom.net>


-Olof
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