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). # Licensed under the GNU General Public License, version 2 (GPLv2).
# ---------------------------------------------------------------------- # ----------------------------------------------------------------------
vmlinux=''
vmlinux_err=''
check_vmlinux() check_vmlinux()
{ {
readelf -h $1 > /dev/null 2>&1 || return 1 readelf -h $1 > /dev/null 2>&1 || return 1
@ -41,16 +43,20 @@ check_vmlinux()
try_decompress() try_decompress()
{ {
# The obscure use of the "tr" filter is to work around older versions of # 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. # "grep" that report the byte offset of the line instead of the pattern.
# Try to find the header ($1) and decompress from here # Try to find the header ($1) and decompress from here
for pos in `tr "$1\n$2" "\n$2=" < "$4" | grep -abo "^$2"` for pos in `tr "$1\n$2" "\n$2=" < "$5" | grep -abo "^$2"`
do do
pos=${pos%%:*} if ! which $3 >/dev/null 2>&1; then
tail -c+$pos "$4" | $3 > $vmlinuxtmp 2> /dev/null vmlinux_err="missing '$3' tool, please install it, usually it's in the '$4' package"
check_vmlinux "$vmlinuxtmp" && echo "$vmlinuxtmp" && return 0 return 0
done fi
pos=${pos%%:*}
tail -c+$pos "$5" | $3 > $vmlinuxtmp 2> /dev/null
check_vmlinux "$vmlinuxtmp" && vmlinux=$vmlinuxtmp && return 0
done
return 1 return 1
} }
@ -68,11 +74,11 @@ extract_vmlinux()
fi fi
# That didn't work, so retry after decompression. # That didn't work, so retry after decompression.
try_decompress '\037\213\010' xy gunzip "$1" && return 0 try_decompress '\037\213\010' xy gunzip gunzip "$1" && return 0
try_decompress '\3757zXZ\000' abcde unxz "$1" && return 0 try_decompress '\3757zXZ\000' abcde unxz xz-utils "$1" && return 0
try_decompress 'BZh' xy bunzip2 "$1" && return 0 try_decompress 'BZh' xy bunzip2 bzip2 "$1" && return 0
try_decompress '\135\0\0\0' xxx unlzma "$1" && return 0 try_decompress '\135\0\0\0' xxx unlzma xz-utils "$1" && return 0
try_decompress '\211\114\132' xy 'lzop -d' "$1" && return 0 try_decompress '\211\114\132' xy 'lzop -d' lzop "$1" && return 0
return 1 return 1
} }
@ -109,8 +115,10 @@ img=''
if [ -z "$img" ]; then if [ -z "$img" ]; then
pstatus yellow UNKNOWN "couldn't find your kernel image in /boot, if you used netboot, this is normal" pstatus yellow UNKNOWN "couldn't find your kernel image in /boot, if you used netboot, this is normal"
else else
vmlinux=$(extract_vmlinux $img) extract_vmlinux $img
if [ -z "$vmlinux" -o ! -r "$vmlinux" ]; then if [ "$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" pstatus yellow UNKNOWN "couldn't extract your kernel from $img"
elif ! which objdump >/dev/null 2>&1; then elif ! which objdump >/dev/null 2>&1; then
pstatus yellow UNKNOWN "missing 'objdump' tool, please install it, usually it's in the binutils package" pstatus yellow UNKNOWN "missing 'objdump' tool, please install it, usually it's in the binutils package"