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

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Date:	Thu, 15 Nov 2007 15:58:49 -0800
From:	Greg KH <greg@...ah.com>
To:	Jan Kiszka <jan.kiszka@....de>
Cc:	Chuck Ebbert <cebbert@...hat.com>, 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>
Subject: Re: [patch 04/13] param_sysfs_builtin memchr argument fix

On Thu, Nov 15, 2007 at 10:20:47PM +0100, Jan Kiszka wrote:
> 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.

Ok, that makes sense, I've added your patch to the queue to go into the
next release with this original patch.

thanks,

greg k-h
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