linux-kernel - Re: [PATCH] sched: core: fix out of bounds read in sched_init

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Date:	Fri, 07 Nov 2014 13:49:25 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Andrey Ryabinin <a.ryabinin@...sung.com>, peterz@...radead.org,
	mingo@...hat.com
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched: core: fix out of bounds read in sched_init_numa()

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On 11/07/2014 09:53 AM, Andrey Ryabinin wrote:

> Zero 'level' (e.g. on non-NUMA system) causing out of bounds
> access in this line:
> 
> sched_max_numa_distance = sched_domains_numa_distance[level - 1];
> 
> Fix this by exiting from sched_init_numa() earlier.
> 
> Signed-off-by: Andrey Ryabinin <a.ryabinin@...sung.com> Fixes:
> 9942f79ba ("sched/numa: Export info needed for NUMA balancing on
> complex topologies")

Reviewed-by: Rik van Riel <riel@...hat.com>

> Another option would be to not call sched_init_numa() if
> nr_node_ids == 1, but I'm not sure that there is no such
> configuration where nr_node_ids > 1 and node_distance(i, j) =
> node_distance(0, 0) for any i and j.

When there is only one node, the distance from the node to itself
will always be equal to node_distance(0, 0)

I am somewhat surprised we go through all of sched_init_numa on
a non-numa system, though :)

- -- 
All rights reversed
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