linux-kernel - [PATCH 03/16] x86: entry_64.S: fix wrong symbolic constant usage: R11->ARGOFFSET

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Message-Id: <f5e1c4084319a42e5f14d41e2d638949ce66bc08.1424989793.git.luto@amacapital.net>
Date:	Thu, 26 Feb 2015 14:40:26 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	x86@...nel.org, linux-kernel@...r.kernel.org
Cc:	Borislav Petkov <bp@...en8.de>, Oleg Nesterov <oleg@...hat.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andy Lutomirski <luto@...capital.net>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Will Drewry <wad@...omium.org>,
	Kees Cook <keescook@...omium.org>
Subject: [PATCH 03/16] x86: entry_64.S: fix wrong symbolic constant usage: R11->ARGOFFSET

From: Denys Vlasenko <dvlasenk@...hat.com>

Since the last fix of this nature, few more instances have crept in.
Fix them up. No object code changes (constants have the same value).

[mea culpa --Andy]

Link: http://lkml.kernel.org/r/1423778052-21038-1-git-send-email-dvlasenk@redhat.com
Signed-off-by: Denys Vlasenko <dvlasenk@...hat.com>
CC: Linus Torvalds <torvalds@...ux-foundation.org>
CC: Oleg Nesterov <oleg@...hat.com>
CC: Borislav Petkov <bp@...en8.de>
CC: "H. Peter Anvin" <hpa@...or.com>
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
Signed-off-by: Andy Lutomirski <luto@...capital.net>
---
 arch/x86/kernel/entry_64.S | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index db13655c3a2a..ac542acb53db 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -757,8 +757,8 @@ retint_swapgs:		/* return to user-space */
 	 * Try to use SYSRET instead of IRET if we're returning to
 	 * a completely clean 64-bit userspace context.
 	 */
-	movq (RCX-R11)(%rsp), %rcx
-	cmpq %rcx,(RIP-R11)(%rsp)		/* RCX == RIP */
+	movq (RCX-ARGOFFSET)(%rsp), %rcx
+	cmpq %rcx,(RIP-ARGOFFSET)(%rsp)		/* RCX == RIP */
 	jne opportunistic_sysret_failed
 
 	/*
@@ -779,7 +779,7 @@ retint_swapgs:		/* return to user-space */
 	shr $__VIRTUAL_MASK_SHIFT, %rcx
 	jnz opportunistic_sysret_failed
 
-	cmpq $__USER_CS,(CS-R11)(%rsp)		/* CS must match SYSRET */
+	cmpq $__USER_CS,(CS-ARGOFFSET)(%rsp)	/* CS must match SYSRET */
 	jne opportunistic_sysret_failed
 
 	movq (R11-ARGOFFSET)(%rsp), %r11
-- 
2.1.0

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