linux-kernel - Re: [tip:x86/urgent] x86: Fix typo in kexec register clearing

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Date:	Wed, 12 Jun 2013 15:22:39 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	mingo@...nel.org, hpa@...or.com, linux-kernel@...r.kernel.org,
	keescook@...omium.org, pageexec@...email.hu, tglx@...utronix.de,
	hpa@...ux.intel.com
Subject: Re: [tip:x86/urgent] x86: Fix typo in kexec register clearing

On 06/12/2013 03:21 PM, tip-bot for Kees Cook wrote:
> Commit-ID:  c8a22d19dd238ede87aa0ac4f7dbea8da039b9c1
> Gitweb:     http://git.kernel.org/tip/c8a22d19dd238ede87aa0ac4f7dbea8da039b9c1
> Author:     Kees Cook <keescook@...omium.org>
> AuthorDate: Wed, 5 Jun 2013 11:47:18 -0700
> Committer:  H. Peter Anvin <hpa@...ux.intel.com>
> CommitDate: Wed, 12 Jun 2013 15:16:18 -0700
> 
> x86: Fix typo in kexec register clearing
> 
> Fixes a typo in register clearing code. Thanks to PaX Team for fixing
> this originally, and James Troup for pointing it out.
> 
> Signed-off-by: Kees Cook <keescook@...omium.org>
> Link: http://lkml.kernel.org/r/20130605184718.GA8396@www.outflux.net
> Cc: <stable@...r.kernel.org> v2.6.30+
> Cc: PaX Team <pageexec@...email.hu>
> Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
> ---
>  arch/x86/kernel/relocate_kernel_64.S | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kernel/relocate_kernel_64.S b/arch/x86/kernel/relocate_kernel_64.S
> index 7a6f3b3..f2bb9c9 100644
> --- a/arch/x86/kernel/relocate_kernel_64.S
> +++ b/arch/x86/kernel/relocate_kernel_64.S
> @@ -160,7 +160,7 @@ identity_mapped:
>  	xorq    %rbp, %rbp
>  	xorq	%r8,  %r8
>  	xorq	%r9,  %r9
> -	xorq	%r10, %r9
> +	xorq	%r10, %r10
>  	xorq	%r11, %r11
>  	xorq	%r12, %r12
>  	xorq	%r13, %r13
> 

As an aside: using xorq here is totally pointless; xorl would work just
fine.

	-hpa

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