From bffda8b3e79e17b93ebda07a7ff181e2bcfcb5fb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?St=C3=A9phane=20Lesimple?= <speed47_github@speed47.net>
Date: Sun, 7 Jan 2018 18:36:56 +0100
Subject: [PATCH] remove dependency on rdmsr

---
 spectre-meltdown-checker.sh | 22 ++++++----------------
 1 file changed, 6 insertions(+), 16 deletions(-)

diff --git a/spectre-meltdown-checker.sh b/spectre-meltdown-checker.sh
index 7e53de5..37138a5 100755
--- a/spectre-meltdown-checker.sh
+++ b/spectre-meltdown-checker.sh
@@ -1,7 +1,7 @@
 #! /bin/sh
 # Spectre & Meltdown checker
 # Stephane Lesimple
-VERSION=0.05
+VERSION=0.06
 
 pstatus()
 {
@@ -116,22 +116,12 @@ fi
 if [ ! -e /dev/cpu/0/msr ]; then
 	pstatus yellow UNKNOWN "couldn't read /dev/cpu/0/msr, is msr support enabled in your kernel?"
 else
-	if which rdmsr >/dev/null 2>&1; then
-		rdmsr 0x48 >/dev/null 2>&1
-		if [ $? -eq 0 ]; then
-			pstatus green YES
-		else
-			pstatus red NO
-		fi
+	# same that rdmsr 0x48 but without needing the rdmsr tool
+	dd if=/dev/cpu/0/msr of=/dev/null bs=8 count=1 skip=9 2>/dev/null
+	if [ $? -eq 0 ]; then
+		pstatus green YES
 	else
-		pstatus yellow UNKNOWN "missing 'rdmsr' tool, please install it, usually it's in the msr-tools package"
-		# doesn't work:
-		#dd if=/dev/cpu/0/msr of=/dev/null bs=1 count=8 skip=72 2>/dev/null
-		#if [ $? -eq 0 ]; then
-		#	pstatus green YES
-		#else
-		#	pstatus red NO
-		#fi
+		pstatus red NO
 	fi
 fi