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spectre-meltdown-checker
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fix: load cpuid module if absent even when /dev/cpu/0/cpuid is there

This commit is contained in:
Stéphane Lesimple 2018-09-08 23:15:21 +02:00
parent 80e0db7cc4
commit 687ce1a7fa
1 changed files with 3 additions and 0 deletions
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spectre-meltdown-checker.sh
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@ -959,11 +959,14 @@ read_cpuid()
if [ -e /dev/cpu/0/cpuid ]; then
# Linux
# on some kernel versions, /dev/cpu/0/cpuid doesn't imply that the cpuid module is loaded, in that case dd returns an error
dd if=/dev/cpu/0/cpuid bs=16 count=1 >/dev/null 2>&1 || load_cpuid
# we need _leaf to be converted to decimal for dd
_leaf=$(( _leaf ))
# to avoid using iflag=skip_bytes, which doesn't exist on old versions of dd, seek to the closer multiple-of-16
_ddskip=$(( _leaf / 16 ))
_odskip=$(( _leaf - _ddskip * 16 ))
# now read the value
_cpuid=$(dd if=/dev/cpu/0/cpuid bs=16 skip=$_ddskip count=$((_odskip + 1)) 2>/dev/null | od -j $((_odskip * 16)) -A n -t u4)
elif [ -e /dev/cpuctl0 ]; then
# BSD