linux-kernel - Re: [PATCH] kconfig: Avoid buffer underrun in choice input

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Date:	Sat, 23 Apr 2011 20:04:51 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Ben Hutchings <ben@...adent.org.uk>, Michal Marek <mmarek@...e.cz>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-kbuild@...r.kernel.org, Roman Zippel <zippel@...ux-m68k.org>
Subject: Re: [PATCH] kconfig: Avoid buffer underrun in choice input

On Sat, Apr 23, 2011 at 06:42:56PM +0100, Ben Hutchings wrote:
> commit 40aee729b350672c2550640622416a855e27938f ('kconfig: fix default
> value for choice input') fixed some cases where kconfig would select
> the wrong option from a choice with a single valid option and thus
> enter an infinite loop.
> 
> However, this broke the test for user input of the form 'N?', because
> when kconfig selects the single valid option the input is zero-length
> and the test will read the byte before the input buffer.  If this
> happens to contain '?' (as it will in a mips build on Debian unstable
> today) then kconfig again enters an infinite loop.
> 
> Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
> Cc: stable@...nel.org [2.6.17+]
> ---
> Roman has failed to respond to this after 5 weeks and one reminder, so
> please take it directly.

No-one has heard from Roman Zippel in several years.
I have suggested Michal Marek to take over the maintainer
role - as he in practice is the kconfig maintainer.

	Sam
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