netdev - Re: [PATCH net-next] af_unix: fix a fatal race with bit fields

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20130501081054.267a7851@nehalam.linuxnetplumber.net>
Date:	Wed, 1 May 2013 08:10:54 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Alan Modra <amodra@...il.com>, Anton Blanchard <anton@...ba.org>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>, linuxppc-dev@...ts.ozlabs.org,
	Paul Mackerras <paulus@...ba.org>,
	Ambrose Feinstein <ambrose@...gle.com>
Subject: Re: [PATCH net-next] af_unix: fix a fatal race with bit fields

On Tue, 30 Apr 2013 22:04:32 -0700
Eric Dumazet <eric.dumazet@...il.com> wrote:

> On Wed, 2013-05-01 at 13:24 +0930, Alan Modra wrote:
> > On Tue, Apr 30, 2013 at 07:24:20PM -0700, Eric Dumazet wrote:
> > > 	li 11,1
> > > 	ld 0,0(9)
> > > 	rldimi 0,11,31,32
> > > 	std 0,0(9)
> > > 	blr
> > > 	.ident	"GCC: (GNU) 4.6.3"
> > > 
> > > You can see "ld 0,0(9)" is used : its a 64 bit load.
> > 
> > Yup.  This is not a powerpc64 specific problem.  See
> > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52080
> > Fixed in 4.8.0 and 4.7.3.
> 
> Ah thanks.
> 
> This seems a pretty serious issue, is it documented somewhere that
> ppc64, sparc64 and others need such compiler version ?
> 
> These kind of errors are pretty hard to find, its a pity to spend time
> on them.

There is a checkbin target inside arch/powerpc/Makefile
Shouldn't a check be added there to block building kernel with known
bad GCC versions?
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html