bump to v0.16 to reflect changes

Fixes

spectre-meltdown-checker.sh

@@ -1,7 +1,7 @@
 #! /bin/sh
 # Spectre & Meltdown checker
 # Stephane Lesimple
-VERSION=0.14
+VERSION=0.16
 
 # print status function
 pstatus()
@@ -33,9 +33,11 @@ pstatus()
 # Licensed under the GNU General Public License, version 2 (GPLv2).
 # ----------------------------------------------------------------------
 
+vmlinux=''
+vmlinux_err=''
 check_vmlinux()
 {
-	file "$1" 2>/dev/null | grep -q ELF || return 1
+	readelf -h $1 > /dev/null 2>&1 || return 1
 	return 0
 }
 
@@ -45,11 +47,15 @@ try_decompress()
 	# "grep" that report the byte offset of the line instead of the pattern.
 
 	# Try to find the header ($1) and decompress from here
-        for     pos in `tr "$1\n$2" "\n$2=" < "$4" | grep -abo "^$2"`
+	for     pos in `tr "$1\n$2" "\n$2=" < "$5" | grep -abo "^$2"`
 	do
+		if ! which $3 >/dev/null 2>&1; then
+			vmlinux_err="missing '$3' tool, please install it, usually it's in the '$4' package"
+			return 0
+		fi
 		pos=${pos%%:*}
-                tail -c+$pos "$4" | $3 > $vmlinuxtmp 2> /dev/null
-                check_vmlinux "$vmlinuxtmp" && echo "$vmlinuxtmp" && return 0
+		tail -c+$pos "$5" | $3 > $vmlinuxtmp 2> /dev/null
+		check_vmlinux "$vmlinuxtmp" && vmlinux=$vmlinuxtmp && return 0
 	done
 	return 1
 }
@@ -68,11 +74,11 @@ extract_vmlinux()
 	fi
 
 	# That didn't work, so retry after decompression.
-	try_decompress '\037\213\010' xy    gunzip     "$1" && return 0
-	try_decompress '\3757zXZ\000' abcde unxz       "$1" && return 0
-	try_decompress 'BZh'          xy    bunzip2    "$1" && return 0
-	try_decompress '\135\0\0\0'   xxx   unlzma     "$1" && return 0
-	try_decompress '\211\114\132' xy    'lzop -d'  "$1" && return 0
+	try_decompress '\037\213\010' xy    gunzip     gunzip	"$1" && return 0
+	try_decompress '\3757zXZ\000' abcde unxz       xz-utils	"$1" && return 0
+	try_decompress 'BZh'          xy    bunzip2    bzip2	"$1" && return 0
+	try_decompress '\135\0\0\0'   xxx   unlzma     xz-utils	"$1" && return 0
+	try_decompress '\211\114\132' xy    'lzop -d'  lzop	"$1" && return 0
 	return 1
 }
 
@@ -109,8 +115,13 @@ img=''
 if [ -z "$img" ]; then
 	pstatus yellow UNKNOWN "couldn't find your kernel image in /boot, if you used netboot, this is normal"
 else
-	vmlinux=$(extract_vmlinux $img)
-	if [ -z "$vmlinux" -o ! -r "$vmlinux" ]; then
+	if ! which readelf >/dev/null 2>&1; then
+		pstatus yellow UNKNOWN "missing 'readelf' tool, please install it, usually it's in the 'binutils' package"
+	else
+		extract_vmlinux $img
+		if [ "$vmlinux_err" != "" ]; then
+			pstatus yellow UNKNOWN "couldn't extract your kernel from $img: $vmlinux_err"
+		elif [ -z "$vmlinux" -o ! -r "$vmlinux" ]; then
 			pstatus yellow UNKNOWN "couldn't extract your kernel from $img"
 		elif ! which objdump >/dev/null 2>&1; then
 			pstatus yellow UNKNOWN "missing 'objdump' tool, please install it, usually it's in the binutils package"
@@ -130,6 +141,7 @@ else
 				status=2
 			fi
 		fi
+	fi
 fi
 
 /bin/echo -ne "> \033[46m\033[30mSTATUS:\033[0m "
@@ -231,53 +243,30 @@ fi
 # Now check if the compiler used to compile the kernel knows how to insert retpolines in generated asm
 # For gcc, this is -mindirect-branch=thunk-extern (detected by the kernel makefiles)
 # See gcc commit https://github.com/hjl-tools/gcc/commit/23b517d4a67c02d3ef80b6109218f2aadad7bd79
-# We'll look for the presence of 'retpoline_call_target' in symbols
+# In latest retpoline LKML patches, the noretpoline_setup symbol exists only if CONFIG_RETPOLINE is set
+# *AND* if the compiler is retpoline-compliant, so look for that symbol
 if [ -n "$vmlinux" ]; then
 	# look for the symbol
-	if which nm >/dev/null 2>&1; then
-		# the proper way: use nm and look for the symbol
-		if nm "$vmlinux" 2>/dev/null | grep -qw retpoline_call_target; then
+	if [ -e /boot/System.map-$(uname -r) ]; then
+		if grep -qw noretpoline_setup /boot/System.map-$(uname -r); then
 			retpoline_compiler=1
-			pstatus green YES "retpoline_call_target found"
+			pstatus green YES "noretpoline_setup symbol found in System.map"
 		fi
-	else
+	elif which nm >/dev/null 2>&1; then
+		# the proper way: use nm and look for the symbol
+		if nm "$vmlinux" 2>/dev/null | grep -qw 'noretpoline_setup'; then
+			retpoline_compiler=1
+			pstatus green YES "noretpoline_setup symbol found in vmlinux"
+		fi
+	elif grep -q noretpoline_setup "$vmlinux"; then
 		# if we don't have nm, nevermind, the symbol name is long enough to not have
 		# any false positive using good old grep directly on the binary
-		if grep -q retpoline_call_target "$vmlinux"; then
 		retpoline_compiler=1
-			pstatus green YES "retpoline_call_target found"
-		fi
+		pstatus green YES "noretpoline_setup symbol found in vmlinux"
 	fi
 	if [ "$retpoline_compiler" != 1 ]; then
-		# still not ? maybe we just don't have symbols in the kernel image (stripped)
-		# let's objdump it and look for the asm sequence (here for 64 bits)
-		#
-		# ffffffff81000350 <__x86.indirect_thunk>:
-		# ffffffff81000350:       e8 05 00 00 00          callq  ffffffff8100035a <retpoline_call_target>
-		# ffffffff81000355:       0f ae e8                lfence 
-		# ffffffff81000358:       eb fb                   jmp    ffffffff81000355 <__x86.indirect_thunk+0x5>
-
-		# ffffffff8100035a <retpoline_call_target>:
-		# ffffffff8100035a:       48 8d 64 24 08          lea    0x8(%rsp),%rsp
-		# ffffffff8100035f:       c3                      retq   
-		#
-		if ! which perl >/dev/null 2>&1; then
-			pstatus yellow UNKNOWN "missing 'perl', please install it"
-		else
-			# directly look for the opcode sequence in the binary
-			# 64 bits version
-			if perl -ne '/\xe8\x05\x00\x00\x00\x0f\xae\xe8\xeb\xfb\x48\x8d\x64\x24\x08\xc3/ and $found=1; END { exit($found ? 0 : 1) }' "$vmlinux"; then
-				retpoline_compiler=1
-				pstatus green YES "retpoline 64 bits asm sequence found"
-			#elif perl -ne ... 32 bits version of retpoline asm seq
-			# TODO
-			#	retpoline_compiler=1
-			#	pstatus green YES "retpoline 33 bits asm sequence found"
-			else
 		pstatus red NO
 	fi
-		fi
-	fi
 else
 	pstatus yellow UNKNOWN "couldn't find your kernel image"
 fi
@@ -314,7 +303,7 @@ elif [ -e /boot/config-$(uname -r) ]; then
 		kpti_support=1
 	fi
 fi
-if [ -e /boot/System.map-$(uname -r) ]; then
+if [ "$kpti_support" = 0 -a -e /boot/System.map-$(uname -r) ]; then
 	# it's not an elif: some backports don't have the PTI config but still include the patch
 	# so we try to find an exported symbol that is part of the PTI patch in System.map
 	kpti_can_tell=1
@@ -322,13 +311,17 @@ if [ -e /boot/System.map-$(uname -r) ]; then
 		kpti_support=1
 	fi
 fi
-if [ -n "$vmlinux" ]; then
+if [ "$kpti_support" = 0 -a -n "$vmlinux" ]; then
 	# same as above but in case we don't have System.map and only vmlinux, look for the
 	# nopti option that is part of the patch (kernel command line option)
 	kpti_can_tell=1
+	if ! which strings >/dev/null 2>&1; then
+		pstatus yellow UNKNOWN "missing 'strings' tool, please install it, usually it's in the binutils package"
+	else
 		if strings "$vmlinux" | grep -qw nopti; then
 			kpti_support=1
 		fi
+	fi
 fi
 
 if [ "$kpti_support" = 1 ]; then