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feat: detect latest Red Hat kernels' RO ibpb_enabled knob

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Stéphane Lesimple 2018-04-10 22:09:38 +02:00
parent 8606e60ef7
commit 10b8d94724
1 changed files with 6 additions and 1 deletions
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7
spectre-meltdown-checker.sh
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@ -2362,7 +2362,12 @@ check_variant2_linux()
fi
if [ -n "$cpuid_ibpb" ] && [ -n "$ibpb_supported" ]; then
if [ -e "$specex_knob_dir/ibpb_enabled" ]; then
explain "Both your CPU and your kernel have IBPB support, but it is currently disabled. You may enable it with \`echo 1 > $specex_knob_dir/ibpb_enabled\`."
# newer (April 2018) Red Hat kernels have ibpb_enabled as ro, and automatically enables it with retpoline
if [ ! -w "$specex_knob_dir/ibpb_enabled" ] && [ -e "$specex_knob_dir/retp_enabled" ]; then
explain "Both your CPU and your kernel have IBPB support, but it is currently disabled. You kernel should enable IBPB automatically if you enable retpoline. You may enable it with \`echo 1 > $specex_knob_dir/retp_enabled\`."
else
explain "Both your CPU and your kernel have IBPB support, but it is currently disabled. You may enable it with \`echo 1 > $specex_knob_dir/ibpb_enabled\`."
fi
else
explain "Both your CPU and your kernel have IBPB support, but it is currently disabled. You may enable it. Check in your distro's documentation on how to do this."
fi