linux-kernel - [PATCH] mce: use safe MSR accesses

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 11 Mar 2015 17:09:38 -0500
From:	<jesse.larrew@....com>
To:	<x86@...nel.org>
CC:	Joel Schopp <joel.schopp@....com>, Tony Luck <tony.luck@...el.com>,
	Borislav Petkov <bp@...en8.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Ingo Molnar" <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	<linux-edac@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Jesse Larrew <jesse.larrew@....com>
Subject: [PATCH] mce: use safe MSR accesses

From: Jesse Larrew <jesse.larrew@....com>

When running as a guest under kvm, it's possible that the MSR
being accessed may not be implemented. All MSR accesses should
be prepared to handle exceptions.

Signed-off-by: Jesse Larrew <jesse.larrew@....com>
---
 arch/x86/kernel/cpu/mcheck/mce.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 61a9668ce..4151ba9 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -1556,12 +1556,12 @@ static int __mcheck_cpu_apply_quirks(struct cpuinfo_x86 *c)
 				 wrmsrl(MSR_K7_HWCR, hwcr | BIT(18));
 
 			 for (i = 0; i < ARRAY_SIZE(msrs); i++) {
-				 rdmsrl(msrs[i], val);
+				 rdmsrl_safe(msrs[i], &val);
 
 				 /* CntP bit set? */
 				 if (val & BIT_64(62)) {
 					val &= ~BIT_64(62);
-					wrmsrl(msrs[i], val);
+					wrmsrl_safe(msrs[i], val);
 				 }
 			 }
 
-- 
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/