linux-kernel - Re: [PATCH] x86/asm/entry/64: move opportunistic sysret code to syscall code path

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Message-ID: <20150407152634.GE14095@pd.tnic>
Date:	Tue, 7 Apr 2015 17:26:34 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Denys Vlasenko <dvlasenk@...hat.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andy Lutomirski <luto@...capital.net>,
	Oleg Nesterov <oleg@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Will Drewry <wad@...omium.org>,
	Kees Cook <keescook@...omium.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/asm/entry/64: move opportunistic sysret code to
 syscall code path

On Thu, Apr 02, 2015 at 06:46:59PM +0200, Denys Vlasenko wrote:
> This change does two things:
> 
> Copy-pastes "retint_swapgs:" code into syscall handling code,
> the copy is under "syscall_return:" label. The code is unchanged
> apart from some label renames.
> 
> Removes "opportunistic sysret" code from "retint_swapgs:" code block,
> since now it won't be reached by syscall return. This in fact removes
> most of the code in question.
> 
>    text	   data	    bss	    dec	    hex	filename
>   12530	      0	      0	  12530	   30f2	entry_64.o.before
>   12562	      0	      0	  12562	   3112	entry_64.o
> 
> Run-tested.
> 
> Signed-off-by: Denys Vlasenko <dvlasenk@...hat.com>
> CC: Linus Torvalds <torvalds@...ux-foundation.org>
> CC: Steven Rostedt <rostedt@...dmis.org>
> CC: Ingo Molnar <mingo@...nel.org>
> CC: Borislav Petkov <bp@...en8.de>
> CC: "H. Peter Anvin" <hpa@...or.com>
> CC: Andy Lutomirski <luto@...capital.net>
> CC: Oleg Nesterov <oleg@...hat.com>
> CC: Frederic Weisbecker <fweisbec@...il.com>
> CC: Alexei Starovoitov <ast@...mgrid.com>
> CC: Will Drewry <wad@...omium.org>
> CC: Kees Cook <keescook@...omium.org>
> CC: x86@...nel.org
> CC: linux-kernel@...r.kernel.org
> ---
>  arch/x86/kernel/entry_64.S | 158 ++++++++++++++++++++++++---------------------
>  1 file changed, 86 insertions(+), 72 deletions(-)

Acked-and-tested-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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