linux-kernel - Re: [patch 04/13] param_sysfs

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Date:	Thu, 15 Nov 2007 22:20:47 +0100
From:	Jan Kiszka <jan.kiszka@....de>
To:	Chuck Ebbert <cebbert@...hat.com>
CC:	Greg KH <gregkh@...e.de>, linux-kernel@...r.kernel.org,
	stable@...nel.org, Justin Forbes <jmforbes@...uxtx.org>,
	Zwane Mwaikambo <zwane@....linux.org.uk>,
	Theodore Ts'o <tytso@....edu>,
	Randy Dunlap <rdunlap@...otime.net>,
	Dave Jones <davej@...hat.com>,
	Chuck Wolber <chuckw@...ntumlinux.com>,
	Chris Wedgwood <reviews@...cw.f00f.org>,
	Michael Krufky <mkrufky@...uxtv.org>,
	Domenico Andreoli <cavokz@...il.com>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Dave Young <hidave.darkstar@...il.com>,
	Greg KH <greg@...ah.com>
Subject: Re: [patch 04/13] param_sysfs_builtin memchr argument fix

Chuck Ebbert wrote:
> On 11/15/2007 12:58 PM, Greg KH wrote:
>> On Thu, Nov 15, 2007 at 11:11:59AM -0500, Chuck Ebbert wrote:
>>> On 11/15/2007 01:09 AM, Greg KH wrote:
>>>> -stable review patch.  If anyone has any objections, please let us know.
>>>>
>>>> ------------------
>>>> From: Dave Young <hidave.darkstar@...il.com>
>>>>
>>>> patch faf8c714f4508207a9c81cc94dafc76ed6680b44 in mainline.
>>>>
>>>> If memchr argument is longer than strlen(kp->name), there will be some
>>>> weird result.
>>>>
>>>> It will casuse duplicate filenames in sysfs for the "nousb".  kernel
>>>> warning messages are as bellow:
>>>>
>>> Needs an additional fix:
>>>
>>> Commit:     22800a2830ec07e7cc5c837999890ac47cc7f5de
>>> fix param_sysfs_builtin name length check
>> That just went in yesterday, right?  If so, it will have to wait until
>> the next -stable review cycle, unless it's totally broken without that
>> change.
>>
>> Is it?
>>
> 
> Yeah, pretty much AFAICT. Maybe Jan can say exactly what happened, but
> it looks like the patch would cause more problems than it solves.
> 

If you have a module parameter like
"my_module.uses_long_parameter_names", Dave's patch caused it to be
rejected if that module was built into the kernel, although "my_module"
is far shorter than MAX_KBUILD_MODNAME, thus perfectly legal.

I noticed this with out-of-tree stuff, but I would bet in-tree users are
affected as well. Hmm... e.g. "nf_conntrack.expect_hashsize" should not
longer exist if nf_conntrack is non-modular.

Jan


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