enh: use g_mode to explicitly save/load the current running mode

src/vulns/CVE-2017-5754.sh

@@ -104,7 +104,7 @@ check_CVE_2017_5754_linux() {
 
         mount_debugfs
         pr_info_nol "  * PTI enabled and active: "
-        if [ "$opt_runtime" = 1 ]; then
+        if [ "$g_mode" = live ]; then
             dmesg_grep="Kernel/User page tables isolation: enabled"
             dmesg_grep="$dmesg_grep|Kernel page table isolation enabled"
             dmesg_grep="$dmesg_grep|x86/pti: Unmapping kernel while in userspace"
@@ -170,7 +170,7 @@ check_CVE_2017_5754_linux() {
     is_xen_dom0 && xen_pv_domo=1
     is_xen_domU && xen_pv_domu=1
 
-    if [ "$opt_runtime" = 1 ]; then
+    if [ "$g_mode" = live ]; then
         # checking whether we're running under Xen PV 64 bits. If yes, we are affected by affected_variant3
         # (unless we are a Dom0)
         pr_info_nol "* Running as a Xen PV DomU: "
@@ -186,7 +186,7 @@ check_CVE_2017_5754_linux() {
         pvulnstatus "$cve" OK "your CPU vendor reported your CPU model as not affected"
     elif [ -z "$msg" ]; then
         # if msg is empty, sysfs check didn't fill it, rely on our own test
-        if [ "$opt_runtime" = 1 ]; then
+        if [ "$g_mode" = live ]; then
             if [ "$kpti_enabled" = 1 ]; then
                 pvulnstatus "$cve" OK "PTI mitigates the vulnerability"
             elif [ "$xen_pv_domo" = 1 ]; then