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Code Issues Releases Wiki Activity

Improve PTI detection

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In case of a busy or misconfigured server, kernel message buffer loop
can be filled with messages broadcasted later than boot time. So dmesg
command wont return boot time messages.

Grepping /var/log/dmesg fixes it and this log file location semms pretty
standard across many common distros
This commit is contained in:
Frederic CORNU 2018-01-09 17:45:49 +01:00
parent 1c3d349667
commit 608952ff71
1 changed files with 2 additions and 2 deletions
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spectre-meltdown-checker.sh
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@ -651,8 +651,8 @@ if [ "$opt_live" = 1 ]; then
elif [ -e /sys/kernel/debug/x86/pti_enabled ]; then
# RedHat Backport creates a dedicated file, see https://access.redhat.com/articles/3311301
kpti_enabled=$(cat /sys/kernel/debug/x86/pti_enabled 2>/dev/null)
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 dmesg
elif grep -Eq 'Kernel/User page tables isolation: enabled|Kernel page table isolation enabled' /var/log/dmesg; then
# if we can't find the flag, grep in /var/log/dmesg
kpti_enabled=1
else
kpti_enabled=0