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feat(bsd): implement CVE-2018-3620 and CVE-2018-3646 mitigation detection

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This commit is contained in:
Stéphane Lesimple 2018-09-22 12:26:48 +02:00
parent fbbb19f244
commit 0252e74f94
1 changed files with 43 additions and 2 deletions
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45
spectre-meltdown-checker.sh
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@ -3609,10 +3609,27 @@ check_CVE_2018_3620_linux()
check_CVE_2018_3620_bsd()
{
_info_nol "* Kernel reserved the memory page at physical address 0x0: "
if sysctl hw.vmm.vmx.l1d_flush >/dev/null 2>&1; then
# https://security.FreeBSD.org/patches/SA-18:09/l1tf-11.2.patch
# this is very difficult to detect that the kernel reserved the 0 page, but this fix
# is part of the exact same patch than the other L1TF CVE, so we detect it
# and deem it as OK if the other patch is there
pstatus green YES
bsd_zero_reserved=1
else
pstatus yellow NO
bsd_zero_reserved=0
fi
if ! is_cpu_vulnerable "$cve"; then
pvulnstatus $cve OK "your CPU vendor reported your CPU model as not vulnerable"
else
pvulnstatus $cve UNK "check not implemented yet under BSD"
if [ "$bsd_zero_reserved" = 1 ]; then
pvulnstatus $cve OK "kernel mitigates the vulnerability"
else
pvulnstatus $cve VULN "your kernel needs to be updated"
fi
fi
}
@ -3784,10 +3801,34 @@ check_CVE_2018_3646_linux()
check_CVE_2018_3646_bsd()
{
_info_nol "* Kernel supports L1D flushing: "
if sysctl hw.vmm.vmx.l1d_flush >/dev/null 2>&1; then
pstatus green YES
kernel_l1d_supported=1
else
pstatus yellow NO
kernel_l1d_supported=0
fi
_info_nol "* L1D flushing is enabled: "
kernel_l1d_enabled=$(sysctl -n hw.vmm.vmx.l1d_flush 2>/dev/null)
case "$kernel_l1d_enabled" in
0) pstatus yellow NO;;
1) pstatus green YES;;
"") pstatus yellow NO;;
*) pstatus yellow UNKNOWN;;
esac
if ! is_cpu_vulnerable "$cve"; then
pvulnstatus $cve OK "your CPU vendor reported your CPU model as not vulnerable"
else
pvulnstatus $cve UNK "check not implemented yet under BSD"
if [ "$kernel_l1d_enabled" = 1 ]; then
pvulnstatus $cve OK "L1D flushing mitigates the vulnerability"
elif [ "$kernel_l1d_supported" = 1 ]; then
pvulnstatus $cve VULN "L1D flushing is supported by your kernel but is disabled"
else
pvulnstatus $cve VULN "your kernel needs to be updated"
fi
fi
}