Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
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Date: Tue, 6 Aug 2019 07:08:51 +0200
From: Borislav Petkov <>
To: Thomas Garnier <>
Cc: Kernel Hardening <>,
	Kristen Carlson Accardi <>,
	Kees Cook <>,
	Andy Lutomirski <>,
	Thomas Gleixner <>,
	Ingo Molnar <>, "H. Peter Anvin" <>,
	the arch/x86 maintainers <>,
	LKML <>
Subject: Re: [PATCH v9 04/11] x86/entry/64: Adapt assembly for PIE support

On Mon, Aug 05, 2019 at 10:50:30AM -0700, Thomas Garnier wrote:
> I saw that %rdx was used for temporary usage and restored before the
> end so I assumed that it was not an option.

PUSH_AND_CLEAR_REGS saves all regs earlier so I think you should be
able to use others. Like SAVE_AND_SWITCH_TO_KERNEL_CR3/RESTORE_CR3, for
example, uses %r15 and %r14.


Good mailing practices for 400: avoid top-posting and trim the reply.

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