linux-kernel - Re: [PATCH] ARM: Convert BUG() to use unreachable()

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]

Date:	Tue, 22 Dec 2009 12:33:34 +0100
From:	Paolo Bonzini <bonzini@....org>
To:	Richard Guenther <richard.guenther@...il.com>
CC:	David Daney <ddaney@...iumnetworks.com>,
	Jamie Lokier <jamie@...reable.org>,
	"gcc@....gnu.org" <gcc@....gnu.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: Convert BUG() to use unreachable()

On 12/17/2009 06:17 PM, Richard Guenther wrote:
> It shouldn't as *(int *)0 = 0; might trap.  But if you want to be sure
> use
>     __builtin_trap ();
> instead for the whole sequence (the unreachable is implied then).
> GCC choses a size-optimal trap representation for your target then.

Agree that it shouldn't but just to be sure I'd use

   *(volatile int *)0 = 0;
   unreachable ();

Paolo
--
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/