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Message-ID: <20190806050851.GA25897@zn.tnic>
Date: Tue, 6 Aug 2019 07:08:51 +0200
From: Borislav Petkov <bp@...en8.de>
To: Thomas Garnier <thgarnie@...omium.org>
Cc: Kernel Hardening <kernel-hardening@...ts.openwall.com>,
Kristen Carlson Accardi <kristen@...ux.intel.com>,
Kees Cook <keescook@...omium.org>,
Andy Lutomirski <luto@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
the arch/x86 maintainers <x86@...nel.org>,
LKML <linux-kernel@...r.kernel.org>
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.
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
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