linux-kernel - Re: [PATCH 2/4] x86: ia32entry.S: fix wrong symbolic constant usage: R11->ARGOFFSET

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Message-ID: <CALCETrWsT75a1Mh61BCEO41CAEz1SWJTuVjkRP=60kr=21T3OQ@mail.gmail.com>
Date:	Sat, 10 Jan 2015 14:13:54 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	Denys Vlasenko <dvlasenk@...hat.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...en8.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	X86 ML <x86@...nel.org>, Alexei Starovoitov <ast@...mgrid.com>,
	Will Drewry <wad@...omium.org>,
	Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH 2/4] x86: ia32entry.S: fix wrong symbolic constant usage: R11->ARGOFFSET

On Sat, Jan 10, 2015 at 2:00 PM, Denys Vlasenko <dvlasenk@...hat.com> wrote:
> The values of these two constants are the same, the meaning is different.

Acked-by: Andy Lutomirski <luto@...capital.net>

I'll make the same change to my pending entry work, and hopefully we
can avoid conflicts.

--Andy

>
> Signed-off-by: Denys Vlasenko <dvlasenk@...hat.com>
> Acked-by: Borislav Petkov <bp@...e.de>
> CC: Linus Torvalds <torvalds@...ux-foundation.org>
> CC: Oleg Nesterov <oleg@...hat.com>
> CC: "H. Peter Anvin" <hpa@...or.com>
> CC: Borislav Petkov <bp@...en8.de>
> CC: Andy Lutomirski <luto@...capital.net>
> CC: Frederic Weisbecker <fweisbec@...il.com>
> CC: X86 ML <x86@...nel.org>
> CC: Alexei Starovoitov <ast@...mgrid.com>
> CC: Will Drewry <wad@...omium.org>
> CC: Kees Cook <keescook@...omium.org>
> CC: linux-kernel@...r.kernel.org
> ---
>  arch/x86/ia32/ia32entry.S | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/ia32/ia32entry.S b/arch/x86/ia32/ia32entry.S
> index 82e8a1d..156ebca 100644
> --- a/arch/x86/ia32/ia32entry.S
> +++ b/arch/x86/ia32/ia32entry.S
> @@ -179,8 +179,8 @@ sysenter_dispatch:
>  sysexit_from_sys_call:
>         andl    $~TS_COMPAT,TI_status+THREAD_INFO(%rsp,RIP-ARGOFFSET)
>         /* clear IF, that popfq doesn't enable interrupts early */
> -       andl  $~0x200,EFLAGS-R11(%rsp)
> -       movl    RIP-R11(%rsp),%edx              /* User %eip */
> +       andl    $~0x200,EFLAGS-ARGOFFSET(%rsp)
> +       movl    RIP-ARGOFFSET(%rsp),%edx                /* User %eip */
>         CFI_REGISTER rip,rdx
>         RESTORE_ARGS 0,24,0,0,0,0
>         xorq    %r8,%r8
> --
> 1.8.1.4
>



-- 
Andy Lutomirski
AMA Capital Management, LLC
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