linux-kernel - Re: freeze when strace X

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] [day] [month] [year] [list]

Date:	Wed, 9 Jun 2010 21:53:50 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Ortwin Glück <odi@....ch>,
	linux-kernel@...r.kernel.org
Subject: Re: freeze when strace X

On Wed, Jun 09, 2010 at 10:47:23PM +0200, Thomas Gleixner wrote:
> On Wed, 9 Jun 2010, Matthew Garrett wrote:
> > strace needs to output text via X, which generates output which needs to 
> > be output via X... and you'll tend to deadlock. If X is holding any 
> > interesting kernel locks at that point then it wouldn't surprise me if 
> > the machine ends up dead.
> 
> Nothing to do with kernel locks. strace hooks into the syscall and
> intercepts the data, so X is stopped at that point. Now try to send
> output to a program which you stopped yourself :)

Oh, yeah, and ctrl+alt+fwhatever is handled by X.

-- 
Matthew Garrett | mjg59@...f.ucam.org
--
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/