linux-kernel - Re: [PATCH] powerpc: fix memory corruption by pnv_alloc_idle_core

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Message-ID: <1427856038.4256.7.camel@ellerman.id.au>
Date:	Wed, 01 Apr 2015 13:40:38 +1100
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Jan Stancek <jstancek@...hat.com>
Cc:	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	benh@...nel.crashing.org, paulus@...ba.org, mikey@...ling.org,
	shreyas@...ux.vnet.ibm.com, preeti@...ux.vnet.ibm.com,
	sbest@...hat.com
Subject: Re: [PATCH] powerpc: fix memory corruption by
 pnv_alloc_idle_core_states

On Tue, 2015-03-31 at 18:11 +0200, Jan Stancek wrote:
> Space allocated for paca is based off nr_cpu_ids,
> but pnv_alloc_idle_core_states() iterates paca with
> cpu_nr_cores()*threads_per_core, which is using NR_CPUS.
> 
> This causes pnv_alloc_idle_core_states() to write over memory,
> which is outside of paca array and may later lead to various panics.
> 
> Fixes: 7cba160ad789 (powernv/cpuidle: Redesign idle states management)
> Signed-off-by: Jan Stancek <jstancek@...hat.com>

Thanks. I'll send that to Linus in the next day or two and mark it for stable
as well.

cheers


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