linux-kernel - Re: [patch 27/85] [PATCH 07/44] [CVE-2009-0029] System call wrapper infrastructure

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Message-Id: <200901161109.21880.borntraeger@de.ibm.com>
Date:	Fri, 16 Jan 2009 11:09:21 +0100
From:	Christian Borntraeger <borntraeger@...ibm.com>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
Cc:	Jiri Slaby <jirislaby@...il.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>,
	Chuck Ebbert <cebbert@...hat.com>,
	Domenico Andreoli <cavokz@...il.com>, Willy Tarreau <w@....eu>,
	Rodrigo Rubira Branco <rbranco@...checkpoint.com>,
	Jake Edge <jake@....net>, Eugene Teo <eteo@...hat.com>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Ralf Baechle <ralf@...ux-mips.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [patch 27/85] [PATCH 07/44] [CVE-2009-0029] System call wrapper infrastructure

Am Freitag 16 Januar 2009 schrieb Heiko Carstens:
> > I see two possible quick fixes:
> > -funit-at-a-time will allow these inline constructs (tested with 3.4.6 on 
i386 
> > with enabled syscall wrappers. x86_64 already sets this flag)
> 
> If that helps: care to send a patch that enables this?
> Dependent on CONFIG_HAVE_SYSCALL_WRAPPERS?

I could do that, but...

> That is, if this is really a problem.

..I dont know if this is really a problem. i386 is the only architecture where 
I was able to reproduce the inline problem. But i386 does not set 
SYSCALL_WRAPPERS so the problem goes away.

I suggest to wait for a patch until we know of an architecture that is 
affected (inline problem + HAVE_SYSCALL_WRAPPERS set).
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