linux-kernel - Re: kdb: add rdmsr and wrmsr commands for i386

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: <464BF7E5.4080105@codewiz.org>
Date:	Thu, 17 May 2007 02:36:21 -0400
From:	Bernardo Innocenti <bernie@...ewiz.org>
To:	Keith Owens <kaos@....com>
CC:	Jordan Crouse <jordan.crouse@....com>, kdb@....sgi.com,
	linux-kernel@...r.kernel.org, devel@...top.org
Subject: Re: kdb: add rdmsr and wrmsr commands for i386

Keith Owens wrote:

> Before using MSR, you must first check that the cpu supports the
> instruction, rd/wrmsr cause an oops on 486 or earlier.  Also using an
> invalid msr number causes an oops, so use rd/wrmsr_safe().

I didn't bother implementing those checks because kdb recovers
nicely from GPF anyway.  It's the valid MSR writes that could
cause unrecoveable problems! :)

-- 
   // Bernardo Innocenti
 \X/  http://www.codewiz.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/