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From: Borislav Petkov <bp@alien8.de>
To: Ingo Molnar <mingo@kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Denys Vlasenko <dvlasenk@redhat.com>,
	Andy Lutomirski <luto@amacapital.net>,
	Alexei Starovoitov <ast@plumgrid.com>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Kees Cook <keescook@chromium.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Oleg Nesterov <oleg@redhat.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Will Drewry <wad@chromium.org>
Subject: [PATCH] x86/asm/entry/64: Fix MSR_IA32_SYSENTER_CS MSR value
Date: Fri,  3 Apr 2015 11:42:10 +0200
Message-ID: <1428054130-25847-1-git-send-email-bp@alien8.de> (raw)

From: Borislav Petkov <bp@suse.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@suse.de>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Will Drewry <wad@chromium.org>
Cc: Ingo Molnar <mingo@kernel.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


             reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-04-03  9:42 Borislav Petkov [this message]
2015-04-03 11:20 ` Borislav Petkov
2015-04-03 11:52   ` Denys Vlasenko
2015-04-03 12:05     ` Borislav Petkov
2015-04-03 12:25       ` [PATCH] x86/asm/entry/64: Use a define for an invalid segment Borislav Petkov
2015-04-03 14:07 ` [tip:x86/asm] x86/asm/entry/64: Fix MSR_IA32_SYSENTER_CS MSR value tip-bot for Borislav Petkov
2015-04-03 14:07 ` [tip:x86/asm] x86/asm/entry/64: Use a define for an invalid segment selector tip-bot for Borislav Petkov

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