linux-kernel - Re: [x86] BUG: unable to handle kernel paging request at 00740060

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: <20131009190851.GX30970@tucnak.zalov.cz>
Date:	Wed, 9 Oct 2013 21:08:51 +0200
From:	Jakub Jelinek <jakub@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Richard Henderson <rth@...ddle.net>
Subject: Re: [x86] BUG: unable to handle kernel paging request at 00740060

On Wed, Oct 09, 2013 at 09:02:31PM +0200, Peter Zijlstra wrote:
> On Wed, Oct 09, 2013 at 08:16:13PM +0200, Jakub Jelinek wrote:
> > Confirmed as gcc bug, filed http://gcc.gnu.org/PR58670
> > Seems all of 4.[6-9] miscompile it.  Will have a look tomorrow
> > unless somebody beats me to it.  But historically, the case where
> > asm goto labels jump to fallthru basic block had numerous problems in the
> > past.
> 
> That bug lists the component as middle end; this suggests x86_64 would
> be vulnerable too, can you confirm? So far we've only observed the wrong
> code on i386 targets, x86_64 targets appeared correct.

Any target, the testcase in the bugzilla aborts on x86_64 with -O2, and
even say on ppc64 (sure, one would have to rewrite the asm to have it fail
at runtime).

	Jakub
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/