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https://github.com/speed47/spectre-meltdown-checker
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refactor: IBRS_ALL & RDCL_NO are Intel-only
This commit is contained in:
Stéphane Lesimple
parent
51e8261a32
commit
59714011db
@ -1587,88 +1587,90 @@ check_cpu()
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fi
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fi
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_info " * Enhanced IBRS (IBRS_ALL)"
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_info_nol " * CPU indicates ARCH_CAPABILITIES MSR availability: "
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cpuid_arch_capabilities=-1
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# A processor supports the ARCH_CAPABILITIES MSR if it enumerates CPUID (EAX=7H,ECX=0):EDX[29] as 1
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read_cpuid 0x7 $EDX 29 1 1; ret=$?
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if [ $ret -eq 0 ]; then
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pstatus green YES
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cpuid_arch_capabilities=1
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elif [ $ret -eq 2 ]; then
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pstatus yellow UNKNOWN "is cpuid kernel module available?"
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else
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pstatus yellow NO
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cpuid_arch_capabilities=0
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fi
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if is_intel; then
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_info " * Enhanced IBRS (IBRS_ALL)"
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_info_nol " * CPU indicates ARCH_CAPABILITIES MSR availability: "
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cpuid_arch_capabilities=-1
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# A processor supports the ARCH_CAPABILITIES MSR if it enumerates CPUID (EAX=7H,ECX=0):EDX[29] as 1
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read_cpuid 0x7 $EDX 29 1 1; ret=$?
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if [ $ret -eq 0 ]; then
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pstatus green YES
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cpuid_arch_capabilities=1
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elif [ $ret -eq 2 ]; then
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pstatus yellow UNKNOWN "is cpuid kernel module available?"
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else
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pstatus yellow NO
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cpuid_arch_capabilities=0
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fi
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_info_nol " * ARCH_CAPABILITIES MSR advertises IBRS_ALL capability: "
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capabilities_rdcl_no=-1
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capabilities_ibrs_all=-1
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if [ "$cpuid_arch_capabilities" = -1 ]; then
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pstatus yellow UNKNOWN
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elif [ "$cpuid_arch_capabilities" != 1 ]; then
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capabilities_rdcl_no=0
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capabilities_ibrs_all=0
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pstatus yellow NO
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elif [ ! -e /dev/cpu/0/msr ] && [ ! -e /dev/cpuctl0 ]; then
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spec_ctrl_msr=-1
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pstatus yellow UNKNOWN "is msr kernel module available?"
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else
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# the new MSR 'ARCH_CAPABILITIES' is at offset 0x10a
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# here we use dd, it's the same as using 'rdmsr 0x10a' but without needing the rdmsr tool
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# if we get a read error, the MSR is not there. bs has to be 8 for msr
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val=0
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val_cap_msr=0
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cpu_mismatch=0
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for i in $(seq 0 "$idx_max_cpu")
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do
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read_msr 0x10a "$i"; ret=$?
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capabilities=$(echo "$read_msr_value" | awk '{print $8}')
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if [ "$i" -eq 0 ]; then
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val=$ret
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val_cap_msr=$capabilities
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else
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if [ "$ret" -eq "$val" ] && [ "$capabilities" -eq "$val_cap_msr" ]; then
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continue
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_info_nol " * ARCH_CAPABILITIES MSR advertises IBRS_ALL capability: "
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capabilities_rdcl_no=-1
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capabilities_ibrs_all=-1
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if [ "$cpuid_arch_capabilities" = -1 ]; then
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pstatus yellow UNKNOWN
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elif [ "$cpuid_arch_capabilities" != 1 ]; then
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capabilities_rdcl_no=0
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capabilities_ibrs_all=0
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pstatus yellow NO
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elif [ ! -e /dev/cpu/0/msr ] && [ ! -e /dev/cpuctl0 ]; then
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spec_ctrl_msr=-1
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pstatus yellow UNKNOWN "is msr kernel module available?"
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else
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# the new MSR 'ARCH_CAPABILITIES' is at offset 0x10a
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# here we use dd, it's the same as using 'rdmsr 0x10a' but without needing the rdmsr tool
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# if we get a read error, the MSR is not there. bs has to be 8 for msr
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val=0
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val_cap_msr=0
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cpu_mismatch=0
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for i in $(seq 0 "$idx_max_cpu")
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do
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read_msr 0x10a "$i"; ret=$?
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capabilities=$(echo "$read_msr_value" | awk '{print $8}')
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if [ "$i" -eq 0 ]; then
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val=$ret
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val_cap_msr=$capabilities
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else
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cpu_mismatch=1
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if [ "$ret" -eq "$val" ] && [ "$capabilities" -eq "$val_cap_msr" ]; then
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continue
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else
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cpu_mismatch=1
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fi
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fi
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fi
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done
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capabilities=$val_cap_msr
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capabilities_rdcl_no=0
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capabilities_ibrs_all=0
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if [ $val -eq 0 ]; then
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_debug "capabilities MSR lower byte is $capabilities (decimal)"
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[ $(( capabilities & 1 )) -eq 1 ] && capabilities_rdcl_no=1
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[ $(( capabilities & 2 )) -eq 2 ] && capabilities_ibrs_all=1
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_debug "capabilities says rdcl_no=$capabilities_rdcl_no ibrs_all=$capabilities_ibrs_all"
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if [ "$capabilities_ibrs_all" = 1 ]; then
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if [ $cpu_mismatch -eq 0 ]; then
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pstatus green YES
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else:
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pstatus green YES "But not in all CPUs"
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done
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capabilities=$val_cap_msr
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capabilities_rdcl_no=0
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capabilities_ibrs_all=0
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if [ $val -eq 0 ]; then
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_debug "capabilities MSR lower byte is $capabilities (decimal)"
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[ $(( capabilities & 1 )) -eq 1 ] && capabilities_rdcl_no=1
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[ $(( capabilities & 2 )) -eq 2 ] && capabilities_ibrs_all=1
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_debug "capabilities says rdcl_no=$capabilities_rdcl_no ibrs_all=$capabilities_ibrs_all"
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if [ "$capabilities_ibrs_all" = 1 ]; then
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if [ $cpu_mismatch -eq 0 ]; then
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pstatus green YES
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else:
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pstatus green YES "But not in all CPUs"
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fi
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else
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pstatus yellow NO
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fi
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elif [ $val -eq 200 ]; then
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pstatus yellow UNKNOWN "is msr kernel module available?"
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else
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pstatus yellow NO
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fi
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elif [ $val -eq 200 ]; then
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pstatus yellow UNKNOWN "is msr kernel module available?"
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fi
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_info_nol " * CPU explicitly indicates not being vulnerable to Meltdown (RDCL_NO): "
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if [ "$capabilities_rdcl_no" = -1 ]; then
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pstatus yellow UNKNOWN
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elif [ "$capabilities_rdcl_no" = 1 ]; then
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pstatus green YES
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else
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pstatus yellow NO
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fi
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fi
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_info_nol " * CPU explicitly indicates not being vulnerable to Meltdown (RDCL_NO): "
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if [ "$capabilities_rdcl_no" = -1 ]; then
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pstatus yellow UNKNOWN
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elif [ "$capabilities_rdcl_no" = 1 ]; then
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pstatus green YES
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else
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pstatus yellow NO
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fi
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_info_nol " * CPU microcode is known to cause stability problems: "
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if is_ucode_blacklisted; then
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pstatus red YES "$ucode_found"
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