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:	Sat, 28 Jun 2008 14:12:37 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Glauber Costa <gcosta@...hat.com>
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

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
--
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/