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Improve PTI detection even more

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when PTI detection relies on dmesg, dmesg output is checked first
then /var/log/dmesg if dmesg output lacks boot time messages
This commit is contained in:
Frederic CORNU 2018-01-09 18:26:32 +01:00
parent 608952ff71
commit a7b14306d5
1 changed files with 5 additions and 2 deletions
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spectre-meltdown-checker.sh
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@ -651,8 +651,11 @@ if [ "$opt_live" = 1 ]; then
elif [ -e /sys/kernel/debug/x86/pti_enabled ]; then elif [ -e /sys/kernel/debug/x86/pti_enabled ]; then
# RedHat Backport creates a dedicated file, see https://access.redhat.com/articles/3311301 # RedHat Backport creates a dedicated file, see https://access.redhat.com/articles/3311301
kpti_enabled=$(cat /sys/kernel/debug/x86/pti_enabled 2>/dev/null) kpti_enabled=$(cat /sys/kernel/debug/x86/pti_enabled 2>/dev/null)
elif grep -Eq 'Kernel/User page tables isolation: enabled|Kernel page table isolation enabled' /var/log/dmesg; then elif dmesg | grep -Eq 'Kernel/User page tables isolation: enabled|Kernel page table isolation enabled'; then
# if we can't find the flag, grep in /var/log/dmesg # if we can't find the flag, grep dmesg output
kpti_enabled=1
elif [ -r /var/log/dmesg ] && grep -Eq 'Kernel/User page tables isolation: enabled|Kernel page table isolation enabled' /var/log/dmesg; then
# if we can't find the flag in dmesg output, grep in /var/log/dmesg when readable
kpti_enabled=1 kpti_enabled=1
else else
kpti_enabled=0 kpti_enabled=0