peter/spectre-meltdown-checker
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feat(kernel): add support for LZ4 decompression

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This commit is contained in:
Stéphane Lesimple 2018-01-10 20:10:57 +01:00
parent b913dacc1b
commit c6e1b0ac8a
1 changed files with 20 additions and 12 deletions
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32
spectre-meltdown-checker.sh
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@ -8,7 +8,7 @@
#
# Stephane Lesimple
#
VERSION=0.23
VERSION=0.24
# Script configuration
show_usage()
@ -364,7 +364,7 @@ vmlinux=''
vmlinux_err=''
check_vmlinux()
{
readelf -h $1 > /dev/null 2>&1 || return 1
readelf -h "$1" > /dev/null 2>&1 || return 1
return 0
}
@ -374,15 +374,22 @@ try_decompress()
# "grep" that report the byte offset of the line instead of the pattern.
# Try to find the header ($1) and decompress from here
for pos in `tr "$1\n$2" "\n$2=" < "$5" | grep -abo "^$2"`
for pos in `tr "$1\n$2" "\n$2=" < "$6" | grep -abo "^$2"`
do
if ! which $3 >/dev/null 2>&1; then
vmlinux_err="missing '$3' tool, please install it, usually it's in the '$4' package"
_debug "try_decompress: magic for $3 found at offset $pos"
if ! which "$3" >/dev/null 2>&1; then
vmlinux_err="missing '$3' tool, please install it, usually it's in the '$5' package"
return 0
fi
pos=${pos%%:*}
tail -c+$pos "$5" | $3 > $vmlinuxtmp 2> /dev/null
check_vmlinux "$vmlinuxtmp" && vmlinux=$vmlinuxtmp && return 0
tail -c+$pos "$6" 2>/dev/null | $3 $4 > $vmlinuxtmp 2>/dev/null
if check_vmlinux "$vmlinuxtmp"; then
vmlinux="$vmlinuxtmp"
_debug "try_decompress: decompressed with $3 successfully!"
return 0
else
_debug "try_decompress: decompression with $3 did not work"
fi
done
return 1
}
@ -402,11 +409,12 @@ extract_vmlinux()
fi
# That didn't work, so retry after decompression.
try_decompress '\037\213\010' xy gunzip gunzip "$1" && return 0
try_decompress '\3757zXZ\000' abcde unxz xz-utils "$1" && return 0
try_decompress 'BZh' xy bunzip2 bzip2 "$1" && return 0
try_decompress '\135\0\0\0' xxx unlzma xz-utils "$1" && return 0
try_decompress '\211\114\132' xy 'lzop -d' lzop "$1" && return 0
try_decompress '\037\213\010' xy gunzip '' gunzip "$1" && return 0
try_decompress '\3757zXZ\000' abcde unxz '' xz-utils "$1" && return 0
try_decompress 'BZh' xy bunzip2 '' bzip2 "$1" && return 0
try_decompress '\135\0\0\0' xxx unlzma '' xz-utils "$1" && return 0
try_decompress '\211\114\132' xy 'lzop' '-d' lzop "$1" && return 0
try_decompress '\002\041\114\030' xyy 'lz4' '-d -l' liblz4-tool "$1" && return 0
return 1
}