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feat(variant4): detect SSBD-aware kernel

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This commit is contained in:
Stéphane Lesimple 2018-05-22 12:05:46 +02:00
parent 19be8f79eb
commit 68af5c5f92
1 changed files with 41 additions and 7 deletions
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48
spectre-meltdown-checker.sh
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@ -1673,7 +1673,7 @@ check_cpu()
_info_nol " * CPU indicates SSBD capability: "
read_cpuid 0x7 $EDX 31 1 1; ret=$?
if [ $ret -eq 0 ]; then
#cpuid_ng1=1
cpuid_ssbd=1
pstatus green YES "SSBD feature bit"
elif [ $ret -eq 1 ]; then
pstatus yellow NO
@ -2890,7 +2890,7 @@ check_variant3a()
sys_interface_available=0
msg=''
_info_nol " * CPU microcode mitigates the vulnerability:"
_info_nol " * CPU microcode mitigates the vulnerability: "
pstatus yellow UNKNOWN "an up to date microcode is sufficient to mitigate this vulnerability, detection will be implemented soon"
cve='CVE-2018-3640'
@ -2914,7 +2914,28 @@ check_variant4()
sys_interface_available=1
fi
if [ "$opt_sysfs_only" != 1 ]; then
:
_info_nol " * Kernel supports speculation store bypass: "
if [ "$opt_live" = 1 ]; then
if grep -q 'Speculation.Store.Bypass:' /proc/self/status 2>/dev/null; then
kernel_ssb='found in /proc/self/status'
_debug "found Speculation.Store.Bypass: in /proc/self/status"
fi
fi
if [ -z "$kernel_ssb" ] && [ -n "$kernel" ]; then
kernel_ssb=$("${opt_arch_prefix}strings" "$kernel" | grep spec_store_bypass | head -n1);
[ -n "$kernel_ssb" ] && _debug "found $kernel_ssb in kernel"
fi
if [ -z "$kernel_ssb" ] && [ -n "$opt_map" ]; then
kernel_ssb=$(grep spec_store_bypass "$opt_map" | head -n1)
[ -n "$kernel_ssb" ] && _debug "found $kernel_ssb in System.map"
fi
if [ -n "$kernel_ssb" ]; then
pstatus green YES "$kernel_ssb"
else
pstatus yellow NO
fi
elif [ "$sys_interface_available" = 0 ]; then
# we have no sysfs but were asked to use it only!
msg="/sys vulnerability interface use forced, but it's not available!"
@ -2925,13 +2946,26 @@ check_variant4()
if ! is_cpu_vulnerable 4; then
# override status & msg in case CPU is not vulnerable after all
pvulnstatus $cve OK "your CPU vendor reported your CPU model as not vulnerable"
elif [ -z "$msg" ]; then
elif [ -z "$msg" ] || [ "$msg" = "Vulnerable" ]; then
# if msg is empty, sysfs check didn't fill it, rely on our own test
pvulnstatus $cve VULN "your CPU microcode needs to be updated"
explain "A new microcode is needed for your CPU to provide mitigation tools that software running on your machine can use to protect itself against the vulnerability."
if [ "$cpuid_ssbd" = 1 ]; then
if [ -n "$kernel_ssb" ]; then
pvulnstatus $cve OK "your system provides the necessary tools for software mitigation"
else
pvulnstatus $cve VULN "your kernel needs to be updated"
explain "You have a recent-enough microcode but your kernel is too old to use the new features exported by your CPU's microcode"
fi
else
if [ -n "$kernel_ssb" ]; then
pvulnstatus $cve VULN "Your CPU doesn't support SSBD"
explain "Your kernel is recent enough to be able to export features for mitigation, but your CPU microcode doesn't provide the necessary tools"
else
pvulnstatus $cve VULN "Neither your CPU nor your kernel support SSBD"
explain "You need to update your CPU microcode and use a more recent kernel to provide the necessary mitigation tools to the software running on your machine"
fi
fi
else
pvulnstatus $cve "$status" "$msg"
[ "$msg" = "Vulnerable" ] && explain "A new microcode is needed for your CPU to provide mitigation tools that software running on your machine can use to protect itself against the vulnerability."
fi
}