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feat(l1tf): read & report ARCH_CAPABILITIES bit 3 (SKIP_VMENTRY_L1DFLUSH)

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Stéphane Lesimple 2018-09-29 13:16:07 +02:00
parent cbb18cb6b6
commit 3b2d529654
1 changed files with 33 additions and 20 deletions
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23
spectre-meltdown-checker.sh
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@ -2148,15 +2148,17 @@ check_cpu()
_info_nol " * ARCH_CAPABILITIES MSR advertises IBRS_ALL capability: "
capabilities_rdcl_no=-1
capabilities_ibrs_all=-1
capabilities_ssb_no=-1
capabilities_rsba=-1
capabilities_l1dflush_no=-1
capabilities_ssb_no=-1
if [ "$cpuid_arch_capabilities" = -1 ]; then
pstatus yellow UNKNOWN
elif [ "$cpuid_arch_capabilities" != 1 ]; then
capabilities_rdcl_no=0
capabilities_ibrs_all=0
capabilities_ssb_no=0
capabilities_rsba=0
capabilities_l1dflush_no=0
capabilities_ssb_no=0
pstatus yellow NO
elif [ ! -e /dev/cpu/0/msr ] && [ ! -e /dev/cpuctl0 ]; then
spec_ctrl_msr=-1
@ -2185,15 +2187,17 @@ check_cpu()
capabilities=$val_cap_msr
capabilities_rdcl_no=0
capabilities_ibrs_all=0
capabilities_ssb_no=0
capabilities_rsba=0
capabilities_l1dflush_no=0
capabilities_ssb_no=0
if [ $val -eq 0 ]; then
_debug "capabilities MSR is $capabilities (decimal)"
[ $(( capabilities >> 0 & 1 )) -eq 1 ] && capabilities_rdcl_no=1
[ $(( capabilities >> 1 & 1 )) -eq 1 ] && capabilities_ibrs_all=1
[ $(( capabilities >> 2 & 1 )) -eq 1 ] && capabilities_rsba=1
[ $(( capabilities >> 3 & 1 )) -eq 1 ] && capabilities_l1dflush_no=1
[ $(( capabilities >> 4 & 1 )) -eq 1 ] && capabilities_ssb_no=1
_debug "capabilities says rdcl_no=$capabilities_rdcl_no ibrs_all=$capabilities_ibrs_all ssb_no=$capabilities_ssb_no rsba=$capabilities_rsba"
_debug "capabilities says rdcl_no=$capabilities_rdcl_no ibrs_all=$capabilities_ibrs_all rsba=$capabilities_rsba l1dflush_no=$capabilities_l1dflush_no ssb_no=$capabilities_ssb_no"
if [ "$capabilities_ibrs_all" = 1 ]; then
if [ $cpu_mismatch -eq 0 ]; then
pstatus green YES
@ -2220,7 +2224,6 @@ check_cpu()
else
pstatus yellow NO
fi
fi
_info_nol " * CPU explicitly indicates not being vulnerable to Variant 4 (SSB_NO): "
if [ "$capabilities_ssb_no" = -1 ]; then
@ -2231,6 +2234,15 @@ check_cpu()
pstatus yellow NO
fi
_info_nol " * CPU/Hypervisor indicates L1D flushing is not necessary on this system: "
if [ "$capabilities_l1dflush_no" = -1 ]; then
pstatus yellow UNKNOWN
elif [ "$capabilities_l1dflush_no" = 1 ]; then
pstatus green YES
else
pstatus yellow NO
fi
_info_nol " * Hypervisor indicates host CPU might be vulnerable to RSB underflow (RSBA): "
if [ "$capabilities_rsba" = -1 ]; then
pstatus yellow UNKNOWN
@ -2239,6 +2251,7 @@ check_cpu()
else
pstatus blue NO
fi
fi
_info_nol " * CPU supports Software Guard Extensions (SGX): "
ret=1