linux-kernel - [PATCH] x86/asm/entry/64: Fix MSR_IA32_SYSENTER

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Message-Id: <1428054130-25847-1-git-send-email-bp@alien8.de>
Date:	Fri,  3 Apr 2015 11:42:10 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Andy Lutomirski <luto@...capital.net>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Kees Cook <keescook@...omium.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Will Drewry <wad@...omium.org>
Subject: [PATCH] x86/asm/entry/64: Fix MSR_IA32_SYSENTER_CS MSR value

From: Borislav Petkov <bp@...e.de>

Commit

  d56fe4bf5f3c ("x86/asm/entry/64: Always set up SYSENTER MSRs")

missed to add "ULL" to the 0 and wrmsrl_safe() complains:

  arch/x86/kernel/cpu/common.c: In function ‘syscall_init’:
  arch/x86/kernel/cpu/common.c:1226:2: warning: right shift count >= width of type
    wrmsrl_safe(MSR_IA32_SYSENTER_CS, 0);

Fix it.

Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Alexei Starovoitov <ast@...mgrid.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Will Drewry <wad@...omium.org>
Cc: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/cpu/common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index bb6633a87a19..2c249b57e4b5 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1223,7 +1223,7 @@ void syscall_init(void)
 	wrmsrl_safe(MSR_IA32_SYSENTER_EIP, (u64)ia32_sysenter_target);
 #else
 	wrmsrl(MSR_CSTAR, ignore_sysret);
-	wrmsrl_safe(MSR_IA32_SYSENTER_CS, 0);
+	wrmsrl_safe(MSR_IA32_SYSENTER_CS, 0ULL);
 	wrmsrl_safe(MSR_IA32_SYSENTER_ESP, 0ULL);
 	wrmsrl_safe(MSR_IA32_SYSENTER_EIP, 0ULL);
 #endif
-- 
2.3.3

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