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meltdown: detecting Xen PV, reporting as not vulnerable

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This commit is contained in:
Stéphane Lesimple 2018-01-14 18:33:01 +01:00
parent 704e54019a
commit b89d67dd15
1 changed files with 22 additions and 1 deletions
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23
spectre-meltdown-checker.sh
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@ -8,7 +8,7 @@
#
# Stephane Lesimple
#
VERSION=0.30
VERSION=0.30+xen-test1
show_usage()
{
@ -1013,6 +1013,25 @@ check_variant3()
pstatus blue NO 'no security impact but performance will be degraded with PTI'
fi
fi
if [ "$opt_live" = 1 ]; then
# checking whether we're running under Xen PV 64 bits. If yes, we're not affected by variant3
_info_nol "* Checking if we're running under Xen PV (64 bits): "
if [ "$(uname -m)" = "x86_64" ]; then
# XXX do we have a better way that relying on dmesg?
if dmesg | grep -q 'Booting paravirtualized kernel on Xen$' ; then
pstatus green YES 'Xen PV is not vulnerable'
xen_pv=1
elif [ -r /var/log/dmesg ] && grep -q 'Booting paravirtualized kernel on Xen$' /var/log/dmesg; then
pstatus green YES 'Xen PV is not vulnerable'
xen_pv=1
else
pstatus blue NO
fi
else
pstatus blue NO
fi
fi
fi
# if we have the /sys interface, don't even check is_cpu_vulnerable ourselves, the kernel already does it
@ -1025,6 +1044,8 @@ check_variant3()
if [ "$opt_live" = 1 ]; then
if [ "$kpti_enabled" = 1 ]; then
pvulnstatus $cve OK "PTI mitigates the vulnerability"
elif [ "$xen_pv" = 1 ]; then
pvulnstatus $cve OK "Xen PV 64 bits is not vulnerable"
else
pvulnstatus $cve VULN "PTI is needed to mitigate the vulnerability"
fi