linux-kernel - Re: [PATCH] thermal: cpu_cooling: fix out of bounds access in time_in

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Message-ID: <20160211150027.GA24955@localhost.localdomain>
Date:	Thu, 11 Feb 2016 07:00:28 -0800
From:	Eduardo Valentin <edubezval@...il.com>
To:	Javi Merino <javi.merino@....com>
Cc:	akpm@...ux-foundation.org, rui.zhang@...el.com,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	drinkcat@...omium.org, Amit Daniel Kachhap <amit.kachhap@...il.com>
Subject: Re: [PATCH] thermal: cpu_cooling: fix out of bounds access in
 time_in_idle

On Thu, Feb 11, 2016 at 12:00:51PM +0000, Javi Merino wrote:
> In __cpufreq_cooling_register() we allocate the arrays for time_in_idle
> and time_in_idle_timestamp to be as big as the number of cpus in this
> cpufreq device.  However, in get_load() we access this array using the
> cpu number as index, which can result in an out of bound access.
> 
> Index time_in_idle{,_timestamp} using the index in the cpufreq_device's
> allowed_cpus mask, as we do for the load_cpu array in
> cpufreq_get_requested_power()
> 
> Reported-by: Nicolas Boichat <drinkcat@...omium.org>
> Cc: Amit Daniel Kachhap <amit.kachhap@...il.com>
> Cc: Zhang Rui <rui.zhang@...el.com>
> Cc: Eduardo Valentin <edubezval@...il.com>
> Tested-by: Nicolas Boichat <drinkcat@...omium.org>
> Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
> Signed-off-by: Javi Merino <javi.merino@....com>


> ---
> Hi Andrew,
> 
> This patch fixes an out of bounds access found by Nicolas Boichat
> using KASAN.  It is acked by Viresh, comaintainer of the cpu cooling
> device and tested by the reporter.  It's been in the list[0] for more
> than a month, I've pinged the thermal maintainers three times but they
> haven't replied.
> 
> Can you merge it via your tree?  Thanks,
> Javi

Somehow this patch was marked as accepted in patchwork and I missed it,
apologize for this. I am adding it to thermal-soc.

BR,
Eduardo