linux-kernel - Re: [ 22/42] sched/debug: Fix sd->*_idx limit range avoiding overflow

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Message-ID: <20130510075941.GB6364@gmail.com>
Date:	Fri, 10 May 2013 09:59:41 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	Namhyung Kim <namhyung.kim@....com>,
	Libin <huawei.libin@...wei.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	jiang.liu@...wei.com, guohanjun@...wei.com,
	Jonghwan Choi <jhbird.choi@...sung.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [ 22/42] sched/debug: Fix sd->*_idx limit range avoiding overflow


* Ben Hutchings <ben@...adent.org.uk> wrote:

> On Tue, 2013-04-23 at 14:52 -0700, Greg Kroah-Hartman wrote:
> > 3.8-stable review patch.  If anyone has any objections, please let me know.
> > 
> > ------------------
> > 
> > From: libin <huawei.libin@...wei.com>
> > 
> > commit fd9b86d37a600488dbd80fe60cca46b822bff1cd upstream.
> > 
> > Commit 201c373e8e ("sched/debug: Limit sd->*_idx range on
> > sysctl") was an incomplete bug fix.
> [...]
> 
> It seems like both these commits ought to be applied to earlier stable
> branches.  Or was the lack of range checking a regression after 3.4?

Both should be applied indeed.

They are not a huge problem as all these facilities are for debugging and 
are root-only, but the two fixes should be applied together or not at all.

Thanks,

	Ingo
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