peter/spectre-meltdown-checker
peter/spectre-meltdown-checker
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cache is_cpu_vulnerable result for performance

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This commit is contained in:
Stéphane Lesimple 2018-01-18 21:16:14 +01:00
parent 56d4f82484
commit de6590cd09
1 changed files with 18 additions and 6 deletions
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24
spectre-meltdown-checker.sh
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@ -170,6 +170,16 @@ _debug()
_echo 3 "\033[34m(debug) $@\033[0m" _echo 3 "\033[34m(debug) $@\033[0m"
} }
is_cpu_vulnerable_cached=0
_is_cpu_vulnerable_cached()
{
[ "$1" = 1 ] && return $variant1
[ "$1" = 2 ] && return $variant2
[ "$1" = 3 ] && return $variant3
echo "$0: error: invalid variant '$1' passed to is_cpu_vulnerable()" >&2
exit 255
}
is_cpu_vulnerable() is_cpu_vulnerable()
{ {
# param: 1, 2 or 3 (variant) # param: 1, 2 or 3 (variant)
@ -177,6 +187,11 @@ is_cpu_vulnerable()
# (note that in shell, a return of 0 is success) # (note that in shell, a return of 0 is success)
# by default, everything is vulnerable, we work in a "whitelist" logic here. # by default, everything is vulnerable, we work in a "whitelist" logic here.
# usage: is_cpu_vulnerable 2 && do something if vulnerable # usage: is_cpu_vulnerable 2 && do something if vulnerable
if [ "$is_cpu_vulnerable_cached" = 1 ]; then
_is_cpu_vulnerable_cached "$1"
return $?
fi
variant1='' variant1=''
variant2='' variant2=''
variant3='' variant3=''
@ -260,12 +275,9 @@ is_cpu_vulnerable()
[ "$variant2" = "immune" ] && variant2=1 || variant2=0 [ "$variant2" = "immune" ] && variant2=1 || variant2=0
[ "$variant3" = "immune" ] && variant3=1 || variant3=0 [ "$variant3" = "immune" ] && variant3=1 || variant3=0
_debug "is_cpu_vulnerable: final results are <$variant1> <$variant2> <$variant3>" _debug "is_cpu_vulnerable: final results are <$variant1> <$variant2> <$variant3>"
is_cpu_vulnerable_cached=1
[ "$1" = 1 ] && return $variant1 _is_cpu_vulnerable_cached "$1"
[ "$1" = 2 ] && return $variant2 return $?
[ "$1" = 3 ] && return $variant3
echo "$0: error: invalid variant '$1' passed to is_cpu_vulnerable()" >&2
exit 255
} }
show_header() show_header()