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feat(kernel): check the BOOT_IMAGE info from cmdline before trying the default names

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This commit is contained in:
Stéphane Lesimple 2018-01-10 15:46:29 +01:00
parent ffc542eb82
commit 8ed1f5e3af
1 changed files with 24 additions and 6 deletions
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30
spectre-meltdown-checker.sh
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@ -139,6 +139,11 @@ _verbose()
_echo 2 "$@"
}
_debug()
{
_echo 3 "(debug) $@"
}
is_cpu_vulnerable()
{
# param: 1, 2 or 3 (variant)
@ -428,12 +433,25 @@ if [ "$opt_live" = 1 ]; then
_info "Checking for vulnerabilities against live running kernel \033[35m"$(uname -s) $(uname -r) $(uname -v) $(uname -m)"\033[0m"
# try to find the image of the current running kernel
[ -e /boot/vmlinuz-linux ] && opt_kernel=/boot/vmlinuz-linux
[ -e /boot/vmlinuz-linux-libre ] && opt_kernel=/boot/vmlinuz-linux-libre
[ -e /boot/vmlinuz-$(uname -r) ] && opt_kernel=/boot/vmlinuz-$(uname -r)
[ -e /boot/kernel-$( uname -r) ] && opt_kernel=/boot/kernel-$( uname -r)
[ -e /boot/bzImage-$(uname -r) ] && opt_kernel=/boot/bzImage-$(uname -r)
[ -e /boot/kernel-genkernel-$(uname -m)-$(uname -r) ] && opt_kernel=/boot/kernel-genkernel-$(uname -m)-$(uname -r)
# first, look for the BOOT_IMAGE hint in the kernel cmdline
if [ -r /proc/cmdline ] && grep -q 'BOOT_IMAGE=' /proc/cmdline; then
opt_kernel=$(grep -Eo 'BOOT_IMAGE=[^ ]+' /proc/cmdline | cut -d= -f2)
_debug "found opt_kernel=$opt_kernel in /proc/cmdline"
# if we have a dedicated /boot partition, our bootloader might have just called it /
# so try to prepend /boot and see if we find anything
[ -e "/boot/$opt_kernel" ] && $opt_kernel="/boot/$opt_kernel"
_debug "opt_kernel is now $opt_kernel"
# else, the full path is already there (most probably /boot/something)
fi
# if we didn't find a kernel, default to guessing
if [ ! -e "$opt_kernel" ]; then
[ -e /boot/vmlinuz-linux ] && opt_kernel=/boot/vmlinuz-linux
[ -e /boot/vmlinuz-linux-libre ] && opt_kernel=/boot/vmlinuz-linux-libre
[ -e /boot/vmlinuz-$(uname -r) ] && opt_kernel=/boot/vmlinuz-$(uname -r)
[ -e /boot/kernel-$( uname -r) ] && opt_kernel=/boot/kernel-$( uname -r)
[ -e /boot/bzImage-$(uname -r) ] && opt_kernel=/boot/bzImage-$(uname -r)
[ -e /boot/kernel-genkernel-$(uname -m)-$(uname -r) ] && opt_kernel=/boot/kernel-genkernel-$(uname -m)-$(uname -r)
fi
# system.map
if [ -e /proc/kallsyms ] ; then