linux-kernel - Re: [PATCH 05/24] x86: Annotate indirect jump in head

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Date:   Fri, 26 Jan 2018 10:24:57 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Dave Hansen <dave.hansen@...el.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Arjan Van De Ven <arjan.van.de.ven@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Jun Nakajima <jun.nakajima@...el.com>,
        Asit Mallick <asit.k.mallick@...el.com>,
        Jason Baron <jbaron@...mai.com>
Subject: Re: [PATCH 05/24] x86: Annotate indirect jump in head_64.S

On Tue, 2018-01-23 at 16:25 +0100, Peter Zijlstra wrote:
> The objtool retpoline validation found this indirect jump. Seeing how
> its on CPU bringup before we run userspace it should be safe, annotate

http://angryflower.com/itsits.gif

> it.
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>

Reviewed-by: David Woodhouse <dwmw@...zon.co.uk>


> ---
>  arch/x86/kernel/head_64.S |    2 ++
>  1 file changed, 2 insertions(+)
> 
> --- a/arch/x86/kernel/head_64.S
> +++ b/arch/x86/kernel/head_64.S
> @@ -23,6 +23,7 @@
>  #include 
>  #include "../entry/calling.h"
>  #include 
> +#include 
>  
>  #ifdef CONFIG_PARAVIRT
>  #include 
> @@ -134,6 +135,7 @@ ENTRY(secondary_startup_64)
>  
>  	/* Ensure I am executing from virtual addresses */
>  	movq	$1f, %rax
> +	ANNOTATE_RETPOLINE_SAFE
>  	jmp	*%rax
>  1:
>  	UNWIND_HINT_EMPTY
> 
> 
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