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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