peter/spectre-meltdown-checker
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spectre-meltdown-checker
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Detect if uncompress binaries are present

This commit is contained in:
Alkorin 2018-01-08 16:11:15 +01:00
parent 1a14483c98
commit 21f81ff5c9
1 changed files with 24 additions and 16 deletions
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40
spectre-meltdown-checker.sh
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@ -33,6 +33,8 @@ pstatus()
# Licensed under the GNU General Public License, version 2 (GPLv2).
# ----------------------------------------------------------------------
vmlinux=''
vmlinux_err=''
check_vmlinux()
{
readelf -h $1 > /dev/null 2>&1 || return 1
@ -41,16 +43,20 @@ check_vmlinux()
try_decompress()
{
# The obscure use of the "tr" filter is to work around older versions of
# "grep" that report the byte offset of the line instead of the pattern.
# The obscure use of the "tr" filter is to work around older versions of
# "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=" < "$4" | grep -abo "^$2"`
do
pos=${pos%%:*}
tail -c+$pos "$4" | $3 > $vmlinuxtmp 2> /dev/null
check_vmlinux "$vmlinuxtmp" && echo "$vmlinuxtmp" && return 0
done
# Try to find the header ($1) and decompress from here
for pos in `tr "$1\n$2" "\n$2=" < "$5" | 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 '$4' package"
return 0
fi
pos=${pos%%:*}
tail -c+$pos "$5" | $3 > $vmlinuxtmp 2> /dev/null
check_vmlinux "$vmlinuxtmp" && vmlinux=$vmlinuxtmp && return 0
done
return 1
}
@ -68,11 +74,11 @@ extract_vmlinux()
fi
# That didn't work, so retry after decompression.
try_decompress '\037\213\010' xy gunzip "$1" && return 0
try_decompress '\3757zXZ\000' abcde unxz "$1" && return 0
try_decompress 'BZh' xy bunzip2 "$1" && return 0
try_decompress '\135\0\0\0' xxx unlzma "$1" && return 0
try_decompress '\211\114\132' xy 'lzop -d' "$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 "$1" && return 0
return 1
}
@ -109,8 +115,10 @@ img=''
if [ -z "$img" ]; then
pstatus yellow UNKNOWN "couldn't find your kernel image in /boot, if you used netboot, this is normal"
else
vmlinux=$(extract_vmlinux $img)
if [ -z "$vmlinux" -o ! -r "$vmlinux" ]; then
extract_vmlinux $img
if [ "$vmlinux_err" != "" ]; then
pstatus yellow UNKNOWN "couldn't extract your kernel from $img: $vmlinux_err"
elif [ -z "$vmlinux" -o ! -r "$vmlinux" ]; then
pstatus yellow UNKNOWN "couldn't extract your kernel from $img"
elif ! which objdump >/dev/null 2>&1; then
pstatus yellow UNKNOWN "missing 'objdump' tool, please install it, usually it's in the binutils package"