linux-kernel - Re: [RESEND][PATCH] gen_init_cpio: avoid stack overflow when expanding

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Message-Id: <20121024140227.299041a9.akpm@linux-foundation.org>
Date:	Wed, 24 Oct 2012 14:02:27 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Kees Cook <keescook@...omium.org>
Cc:	linux-kernel@...r.kernel.org, Michal Marek <mmarek@...e.cz>,
	Brad Spengler <spender@...ecurity.net>,
	PaX Team <pageexec@...email.hu>
Subject: Re: [RESEND][PATCH] gen_init_cpio: avoid stack overflow when
 expanding

On Wed, 24 Oct 2012 13:57:56 -0700
Kees Cook <keescook@...omium.org> wrote:

> Fix possible overflow of the buffer used for expanding environment
> variables when building file list.
> 
> $ cat usr/crash.list
> file foo ${BIG}${BIG}${BIG}${BIG}${BIG}${BIG} 0755 0 0
> $ BIG=$(perl -e 'print "A" x 4096;') ./usr/gen_init_cpio usr/crash.list
> *** buffer overflow detected ***: ./usr/gen_init_cpio terminated
> 
> This also replaces the space-indenting with tabs.
> 
> Patch based on existing fix extracted from grsecurity.
> 
> ...
>
> Cc: stable@...r.kernel.org

Why did you feel we need to backport this to -stable?
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