linux-kernel - Re: [crash, bisected] Re: [PATCH 3/4] x86

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: <486ADC8C.5010404@zytor.com>
Date:	Tue, 01 Jul 2008 18:40:28 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Mike Travis <travis@....com>
CC:	Jeremy Fitzhardinge <jeremy@...p.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jack Steiner <steiner@....com>
Subject: Re: [crash, bisected] Re: [PATCH 3/4] x86_64: Fold pda into per cpu
 area

Mike Travis wrote:
> 
> One interesting thing I've discovered is the gcc --version may make a
> difference.
> 
> The kernel panic that occurred from Ingo's config, I was able to replicate
> with GCC 4.2.0 (which is on our devel server).  But this one complained
> about not being able to handle the STACK-PROTECTOR option so I moved
> everything to another machine that has 4.2.4, and now it seems that it
> works fine.  I'm still re-verifying that the source bits and config options 
> are identical (it was a later git-remote update), and that in fact it is
> the gcc --version, but that may be the conclusion.  (My code also has some
> patches submitted but not yet included in the tip/master tree.  Curiously
> just enabling some debug options changed the footprint of the panic.)
> 
> Are we allowed to insist on a specific level of GCC for compiling the
> kernel?
> 

Yes, but certainly not anything even close to that recent -- I think 
right now we're supposed to support back to 3.2-something overall; 
specific architectures might have more stringent requirements.  There 
are a couple of gcc versions known to miscompile there kernel that we 
don't support; I don't know if 4.2.0 is one of them.

	-hpa
--
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/