linux-kernel - Re: [stable] [patch 42/94] [PATCH 11/44] [CVE-2009-0029] System call wrappers part 01

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Date:	Fri, 16 Jan 2009 07:00:04 -0800
From:	Greg KH <greg@...ah.com>
To:	Pavel Machek <pavel@...e.cz>
Cc:	Heiko Carstens <heiko.carstens@...ibm.com>,
	Eugene Teo <eteo@...hat.com>, Theodore Ts'o <tytso@....edu>,
	Zwane Mwaikambo <zwane@....linux.org.uk>,
	torvalds@...ux-foundation.org, Greg KH <gregkh@...e.de>,
	Justin Forbes <jmforbes@...uxtx.org>,
	linux-kernel@...r.kernel.org,
	Chris Wedgwood <reviews@...cw.f00f.org>,
	Domenico Andreoli <cavokz@...il.com>, jbenc@...e.cz,
	Randy Dunlap <rdunlap@...otime.net>, Willy Tarreau <w@....eu>,
	Michael Krufky <mkrufky@...uxtv.org>, alan@...rguk.ukuu.org.uk,
	Chuck Ebbert <cebbert@...hat.com>,
	Dave Jones <davej@...hat.com>, akpm@...ux-foundation.org,
	Jake Edge <jake@....net>,
	Chuck Wolber <chuckw@...ntumlinux.com>, stable@...nel.org,
	Rodrigo Rubira Branco <rbranco@...checkpoint.com>
Subject: Re: [stable] [patch 42/94] [PATCH 11/44] [CVE-2009-0029] System
	call wrappers part 01

On Fri, Jan 16, 2009 at 03:43:04PM +0100, Pavel Machek wrote:
> On Fri 2009-01-16 12:24:35, Heiko Carstens wrote:
> > On Fri, Jan 16, 2009 at 12:00:29PM +0100, Pavel Machek wrote:
> > > 
> > > > 2.6.28-stable review patch.  If anyone has any objections, please let us know.
> > > > 
> > > > ------------------
> > > > 
> > > > From: Heiko Carstens <heiko.carstens@...ibm.com>
> > > > 
> > > > commit 58fd3aa288939d3097fa04505b25c2f5e6e144d1 upstream.
> > > > 
> > > > Signed-off-by: Heiko Carstens <heiko.carstens@...ibm.com>
> > > > Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
> > > 
> > > That does not make review exactly easy. Would it be possible to
> > > inline upstream comment in the commit message?
> > > 
> > > ...upstream commit message is empty :-(.
> > 
> > Yes, what should it contain anyway?
> > "This converts the first 10 system calls to the system call wrapper
> > infrastructure"? IMHO the subject says enough.
> 
> "This converts the first 10 system calls to the system call wrapper
> infrastructure. This is neccessary because of <description of security
> hole>. It is good idea to convert all syscalls and not only affected
> ones for uniformity."
> 
> ....at the very least.
> 
> > > > -asmlinkage long
> > > > -sys_nanosleep(struct timespec __user *rqtp, struct timespec __user *rmtp)
> > > > +SYSCALL_DEFINE2(nanosleep, struct timespec __user *, rqtp,
> > > > +		struct timespec __user *, rmtp)
> > > >  {
> > > >  	struct timespec tu;
> > > >  
> > > 
> > > Is it strictly neccessary to modify all the syscalls? 
> > 
> > Not strictly necessary, but much easier to maintain in the long term.
> > It's simply a just convert 'em all approach and never think again about
> > this.
> 
> I believe we should go for minimal patch for -stable. This is really
> huge.

Well, it's spread over 44 patches, but the end result is not that much.
And yes, based on the problem, it is required for -stable.

thanks,

greg k-h
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