dsanchez/spectre-meltdown-checker
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Merge pull request #7 from Feandil/redhat

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Redhat support
This commit is contained in:
Stéphane Lesimple 2018-01-08 14:17:33 +01:00 committed by GitHub
commit 7bbcfe0df7
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1 changed files with 22 additions and 13 deletions
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spectre-meltdown-checker.sh
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@ -171,15 +171,20 @@ if [ ! -e /sys/kernel/debug/sched_features ]; then
# try to mount the debugfs hierarchy ourselves and remember it to umount afterwards
mount -t debugfs debugfs /sys/kernel/debug 2>/dev/null && mounted_debugfs=1
fi
if [ -e /sys/kernel/debug/ibrs_enabled -o -e /sys/kernel/debug/x86/ibrs_enabled ]; then
if [ -e /sys/kernel/debug/ibrs_enabled ]; then
# if the file is there, we have IBRS compiled-in
pstatus green YES
ibrs_supported=1
ibrs_enabled=$(cat /sys/kernel/debug/ibrs_enabled 2>/dev/null)
elif [ -e /sys/kernel/debug/x86/ibrs_enabled ]; then
# RedHat uses a different path (see https://access.redhat.com/articles/3311301)
pstatus green YES
ibrs_supported=1
ibrs_enabled=$(cat /sys/kernel/debug/x86/ibrs_enabled 2>/dev/null)
else
pstatus red NO
fi
[ -f /sys/kernel/debug/ibrs_enabled ] && ibrs_enabled=$(cat /sys/kernel/debug/ibrs_enabled 2>/dev/null) || ibrs_enabled=$(cat /sys/kernel/debug/x86/ibrs_enabled 2>/dev/null)
/bin/echo -n "* IBRS enabled for Kernel space: "
# 0 means disabled
# 1 is enabled only for kernel space
@ -199,11 +204,6 @@ case "$ibrs_enabled" in
*) pstatus yellow unknown;;
esac
if [ "$mounted_debugfs" = 1 ]; then
# umount debugfs if we did mount it ourselves
umount /sys/kernel/debug
fi
/bin/echo "* Mitigation 2"
/bin/echo -n "* Kernel compiled with retpolines: "
# We check the RETPOLINE kernel options
@ -250,13 +250,13 @@ kpti_can_tell=0
if [ -e /proc/config.gz ]; then
# either the running kernel exports his own config
kpti_can_tell=1
if zgrep -q '^CONFIG_PAGE_TABLE_ISOLATION=y' /proc/config.gz; then
if zgrep -q '^\(CONFIG_PAGE_TABLE_ISOLATION=y\|CONFIG_KAISER=y\)' /proc/config.gz; then
kpti_support=1
fi
elif [ -e /boot/config-$(uname -r) ]; then
# or we can find a config file in /root with the kernel release name
kpti_can_tell=1
if grep -q '^CONFIG_PAGE_TABLE_ISOLATION=y' /boot/config-$(uname -r); then
if grep -q '^\(CONFIG_PAGE_TABLE_ISOLATION=y\|CONFIG_KAISER=y\)' /boot/config-$(uname -r); then
kpti_support=1
fi
fi
@ -290,17 +290,26 @@ if grep ^flags /proc/cpuinfo | grep -qw pti; then
# vanilla PTI patch sets the 'pti' flag in cpuinfo
pstatus green YES
kpti_enabled=1
elif [ -e /sys/kernel/debug/x86/pti_enabled ]; then
# RedHat Backport creates a dedicated file, see https://access.redhat.com/articles/3311301
kpti_enabled=$(cat /sys/kernel/debug/x86/pti_enabled 2>/dev/null)
elif dmesg | grep -Eq 'Kernel/User page tables isolation: enabled|Kernel page table isolation enabled'; then
# if we can't find the flag, grep in dmesg
pstatus green YES
kpti_enabled=1
elif [ -e /sys/kernel/debug/x86/pti_enabled -a "$(cat /sys/kernel/debug/x86/pti_enabled 2>/dev/null)" = 1 ]; then
pstatus green YES
kpti_enabled=1
else
kpti_enabled=0
fi
if [ "$kpti_enabled" = 1 ]; then
pstatus green YES
else
pstatus red NO
fi
if [ "$mounted_debugfs" = 1 ]; then
# umount debugfs if we did mount it ourselves
umount /sys/kernel/debug
fi
/bin/echo -ne "> \033[46m\033[30mSTATUS:\033[0m "
if grep -q AMD /proc/cpuinfo; then
pstatus green "NOT VULNERABLE" "your CPU is not vulnerable as per the vendor"