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

src/vulns/CVE-2018-3639.sh

@@ -18,7 +18,7 @@ check_CVE_2018_3639_linux() {
     fi
     if [ "$opt_sysfs_only" != 1 ]; then
         pr_info_nol "* Kernel supports disabling speculative store bypass (SSB): "
-        if [ "$opt_runtime" = 1 ]; then
+        if [ "$g_mode" = live ]; then
             if grep -Eq 'Speculation.?Store.?Bypass:' "$g_procfs/self/status" 2>/dev/null; then
                 kernel_ssb="found in $g_procfs/self/status"
                 pr_debug "found Speculation.Store.Bypass: in $g_procfs/self/status"
@@ -57,7 +57,7 @@ check_CVE_2018_3639_linux() {
         fi
 
         kernel_ssbd_enabled=-1
-        if [ "$opt_runtime" = 1 ]; then
+        if [ "$g_mode" = live ]; then
             # https://elixir.bootlin.com/linux/v5.0/source/fs/proc/array.c#L340
             pr_info_nol "* SSB mitigation is enabled and active: "
             if grep -Eq 'Speculation.?Store.?Bypass:[[:space:]]+thread' "$g_procfs/self/status" 2>/dev/null; then
@@ -106,7 +106,7 @@ check_CVE_2018_3639_linux() {
         # if msg is empty, sysfs check didn't fill it, rely on our own test
         if [ -n "$cap_ssbd" ]; then
             if [ -n "$kernel_ssb" ]; then
-                if [ "$opt_runtime" = 1 ]; then
+                if [ "$g_mode" = live ]; then
                     if [ "$kernel_ssbd_enabled" -gt 0 ]; then
                         pvulnstatus "$cve" OK "your CPU and kernel both support SSBD and mitigation is enabled"
                     else