peter/spectre-meltdown-checker
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add mitigation detection for l1tf for xen based systems

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This commit is contained in:
Hans-Joachim Kliemeck 2018-12-15 20:45:37 +01:00
parent d7d2e6934b
commit a266165bad
1 changed files with 83 additions and 20 deletions
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103
spectre-meltdown-checker.sh
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@ -1414,6 +1414,57 @@ is_zen_cpu()
return 1
}
# Test if the current host is a Xen PV Dom0 / DomU
is_xen() {
if [ ! -d "$procfs/xen" ]; then
return 0
fi
# XXX do we have a better way that relying on dmesg?
dmesg_grep 'Booting paravirtualized kernel on Xen$'; ret=$?
if [ $ret -eq 2 ]; then
_warn "dmesg truncated, Xen detection will be unreliable. Please reboot and relaunch this script"
return 0
elif [ $ret -eq 0 ]; then
return 1
else
return 0
fi
}
is_xen_dom0()
{
if [ $((is_xen)) -ne 1 ]; then
return 0
fi
if [ -e "$procfs/xen/capabilities" ] && grep -q "control_d" "$procfs/xen/capabilities"; then
return 1
else
return 0
fi
}
is_xen_domU()
{
if [ $((is_xen)) -ne 1 ]; then
return 0
fi
# PVHVM guests also print 'Booting paravirtualized kernel', so we need this check.
dmesg_grep 'Xen HVM callback vector for event delivery is enabled$'; ret=$?
if [ $ret -eq 0 ]; then
return 0
fi
if [ $((is_xen_dom0)) -eq 0 ]; then
return 1
else
return 0
fi
}
if [ -r "$mcedb_cache" ]; then
mcedb_source="$mcedb_cache"
mcedb_info="local MCExtractor DB "$(grep -E '^# %%% MCEDB ' "$mcedb_source" | cut -c13-)
@ -3292,24 +3343,8 @@ check_CVE_2017_5754_linux()
# Test if the current host is a Xen PV Dom0 / DomU
if [ -d "$procfs/xen" ]; then
# XXX do we have a better way that relying on dmesg?
dmesg_grep 'Booting paravirtualized kernel on Xen$'; ret=$?
if [ $ret -eq 2 ]; then
_warn "dmesg truncated, Xen detection will be unreliable. Please reboot and relaunch this script"
elif [ $ret -eq 0 ]; then
if [ -e "$procfs/xen/capabilities" ] && grep -q "control_d" "$procfs/xen/capabilities"; then
xen_pv_domo=1
else
xen_pv_domu=1
fi
# PVHVM guests also print 'Booting paravirtualized kernel', so we need this check.
dmesg_grep 'Xen HVM callback vector for event delivery is enabled$'; ret=$?
if [ $ret -eq 0 ]; then
xen_pv_domu=0
fi
fi
fi
xen_pv_domo=$((is_xen_dom0))
xen_pv_domu=$((is_xen_domU))
if [ "$opt_live" = 1 ]; then
# checking whether we're running under Xen PV 64 bits. If yes, we are affected by variant3
@ -3851,8 +3886,28 @@ check_CVE_2018_3646_linux()
l1d_mode=2
pstatus green YES "unconditional flushes"
else
l1d_mode=-1
pstatus yellow UNKNOWN "unrecognized mode"
if [ $((is_xen_dom0)) -eq 1 ]; then
l1d_xen_hardware=$(xl dmesg | grep -Eq 'Hardware features:' | grep -Eq 'L1D_FLUSH' | head -1)
l1d_xen_hypervisor=$(xl dmesg | grep -Eq 'Xen settings:' | grep -Eq 'L1D_FLUSH' | head -1)
l1d_xen_pv_domU=$(xl dmesg | grep -Eq 'PV L1TF shadowing:' | grep -Eq 'DomU enabled' | head -1)
if [ -z "$l1d_xen_hardware" ] && [ -z "$l1d_xen_hypervisor" ] && [ -z "$l1d_xen_pv_domU" ]; then
l1d_mode=5
pstatus green YES "for XEN guests"
elif [ -z "$l1d_xen_hardware" ] && [ -z "$l1d_xen_hypervisor" ]; then
l1d_mode=4
pstatus green YES "for XEN guests (HVM only)"
elif [ -z "$l1d_xen_pv_domU" ]; then
l1d_mode=3
pstatus green YES "for XEN guests (PV only)"
else
l1d_mode=0
pstatus yellow NO "for XEN guests"
fi
else
l1d_mode=-1
pstatus yellow UNKNOWN "unrecognized mode"
fi
fi
else
l1d_mode=-1
@ -3920,6 +3975,14 @@ check_CVE_2018_3646_linux()
fi
fi
fi
if [ $l1d_mode -gt 3 ]; then
_warn
_warn "This host is a Xen Dom0. Please make sure that you are running your DomUs"
_warn "with a kernel which contains CVE-2018-3646 mitigations."
_warn
_warn "See https://www.suse.com/support/kb/doc/?id=7023078 and XSA-273 for details."
fi
fi
}