linux-kernel - Re: [PATCH 17/39] clobber rbx in putuser

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:	Mon, 30 Jun 2008 18:40:10 -0300
From:	Glauber Costa <gcosta@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...e.hu,
	x86@...nel.org
Subject: Re: [PATCH 17/39] clobber rbx in putuser_64.S

Andi Kleen wrote:
> Glauber Costa <gcosta@...hat.com> writes:
> 
>> Instead of clobbering r8, clobber rbx, which is the i386 way.
> 
> Note rbx is callee saved on 64bit, so using that one means
> the surrounding function always has to save explicitely.
> Not the case with r8.
> 
> There's a reason it is the way it is.
> 
> -Andi

Andi, how about this one ?

View attachment "0001-Use-r8-as-clobber-for-putuser-at-x86_64.patch" of type "text/plain" (4369 bytes)