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fix: read_cpuid: don't use iflag=skip_bytes for compat with old dd versions

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This closes #215 #199 #193
This commit is contained in:
Stéphane Lesimple 2018-07-22 20:07:44 +02:00
parent 30c4a1f6d2
commit cc2910fbbc
1 changed files with 4 additions and 1 deletions
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spectre-meltdown-checker.sh
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@ -912,7 +912,10 @@ read_cpuid()
# Linux
# we need _leaf to be converted to decimal for dd
_leaf=$(( _leaf ))
_cpuid=$(dd if=/dev/cpu/0/cpuid bs=16 skip="$_leaf" iflag=skip_bytes count=1 2>/dev/null | od -A n -t u4)
# to avoid using iflag=skip_bytes, which doesn't exist on old versions of dd, seek to the closer multiple-of-16
_ddskip=$(( _leaf / 16 ))
_odskip=$(( _leaf - _ddskip * 16 ))
_cpuid=$(dd if=/dev/cpu/0/cpuid bs=16 skip=$_ddskip count=$((_odskip + 1)) 2>/dev/null | od -j $((_odskip * 16)) -A n -t u4)
elif [ -e /dev/cpuctl0 ]; then
# BSD
_cpuid=$(cpucontrol -i "$_leaf" /dev/cpuctl0 2>/dev/null | awk '{print $4,$5,$6,$7}')