linux-kernel - Re: [tip:x86/pti] x86/retpoline: Fill return stack buffer on vmexit

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Date:   Thu, 25 Jan 2018 20:10:46 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     David Woodhouse <dwmw2@...radead.org>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>, tim.c.chen@...ux.intel.com,
        pjt@...gle.com, jikos@...nel.org, gregkh@...ux-foundation.org,
        dave.hansen@...el.com, mingo@...nel.org, riel@...hat.com,
        luto@...capital.net, torvalds@...ux-foundation.org,
        ak@...ux.intel.com, keescook@...gle.com, peterz@...radead.org,
        tglx@...utronix.de, hpa@...or.com, linux-kernel@...r.kernel.org,
        linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/pti] x86/retpoline: Fill return stack buffer on vmexit

On Thu, Jan 25, 2018 at 08:07:29PM +0100, Borislav Petkov wrote:
> static inline void vmexit_fill_RSB(void)
> {
> #ifdef CONFIG_RETPOLINE
>         alternative_input("", "call __fill_rsb_clobber_ax", X86_FEATURE_RETPOLINE, ASM_NO_INPUT_CLOBBER("memory"));

Whoops, forgot the clobbers:

        alternative_input("", "call __fill_rsb_clobber_ax", X86_FEATURE_RETPOLINE, ASM_NO_INPUT_CLOBBER(_ASM_AX, "memory"));

-- 
Regards/Gruss,
    Boris.

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