Detect if 'strings' is present

spectre-meltdown-checker.sh

@@ -280,9 +280,13 @@ 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