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: <4873FD00.1060101@goop.org>
Date:	Tue, 08 Jul 2008 16:49:20 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Mike Travis <travis@....com>, "H. Peter Anvin" <hpa@...or.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

Eric W. Biederman wrote:
> Mike Travis <travis@....com> writes:
>
>   
>> Unfortunately it's back to the problem of faulting before x86_64_start_kernel()
>> and grub just immediately reboots.  So I'm back at analyzing assembler and
>> config differences.
>>     
>
> Ok.  That is a narrow window of code.  So it shouldn't be too bad, nasty though.
>
> If you would like to trace through it I have attached my serial port
> debugging routines that I use in that part of the code.

Last time it was doing this, it was a result of a triple-fault caused by 
loading %ds with an all-zero gdt.  I modified Xen to dump the CPU state 
on triple-faults, so it was easy to pinpoint.  I can do that again if it 
helps.

    J
--
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/