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https://github.com/speed47/spectre-meltdown-checker
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enh(taa): more complete version
This commit is contained in:
Stéphane Lesimple
parent
c100ce4c0d
commit
cb279a49ec
@ -4719,66 +4719,89 @@ check_mds_linux()
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check_CVE_2019_11135()
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{
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cve='CVE-2019-11135'
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check_taa $cve
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_info "\033[1;34m$cve aka '$(cve2name "$cve")'\033[0m"
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if [ "$os" = Linux ]; then
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check_CVE_2019_11135_linux
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#elif echo "$os" | grep -q BSD; then
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# check_CVE_2019_11135_bsd
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else
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_warn "Unsupported OS ($os)"
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fi
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}
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# TSX Asynchronous Abort
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check_taa()
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check_CVE_2019_11135_linux()
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{
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status=UNK
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sys_interface_available=0
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msg=''
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if sys_interface_check "/sys/devices/system/cpu/vulnerabilities/tsx_async_abort"; then
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# this kernel has the /sys interface, trust it over everything
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sys_interface_available=1
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fi
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if [ "$opt_sysfs_only" != 1 ]; then
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_info_nol "* TAA mitigation is supported by kernel: "
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kernel_taa=''
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if [ -n "$kernel_err" ]; then
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kernel_taa_err="$kernel_err"
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elif grep -q 'tsx_async_abort' "$kernel"; then
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kernel_taa="found tsx_async_abort in kernel image"
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fi
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if [ -n "$kernel_taa" ]; then
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pstatus green YES "$kernel_taa"
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elif [ -n "$kernel_taa_err" ]; then
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pstatus yellow UNKNOWN "$kernel_taa_err"
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else
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pstatus yellow NO
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fi
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cve=$1
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_info "\033[1;34m$cve aka '$(cve2name "$cve")'\033[0m"
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if [ "$opt_live" != 1 ]; then
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pstatus blue N/A "not testable in offline mode"
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pvulnstatus "$cve" UNK
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return
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_info_nol "* TAA mitigation enabled and active: "
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if [ "$opt_live" = 1 ]; then
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if [ -n "$fullmsg" ]; then
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if echo "$fullmsg" | grep -qE '^Mitigation'; then
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pstatus green YES "$fullmsg"
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else
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pstatus yellow NO
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fi
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else
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pstatus yellow NO "tsx_async_abort not found in sysfs hierarchy"
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fi
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else
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pstatus blue N/A "not testable in offline mode"
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fi
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elif [ "$sys_interface_available" = 0 ]; then
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# we have no sysfs but were asked to use it only!
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msg="/sys vulnerability interface use forced, but it's not available!"
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status=UNK
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fi
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if ! is_cpu_vulnerable "$cve" ; then
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# override status & msg in case CPU is not vulnerable after all
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pvulnstatus "$cve" OK "your CPU vendor reported your CPU model as not vulnerable"
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return
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fi
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if sys_interface_check '/sys/devices/system/cpu/vulnerabilities/tsx_async_abort'; then
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# this kernel has the /sys interface, trust it over everything
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sys_interface_available=1
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fi
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if [ "$sys_interface_available" = 1 ]; then
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if grep -Eq 'Not affected' "/sys/devices/system/cpu/vulnerabilities/tsx_async_abort"; then
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taa_mitigated=1
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elif grep -Eq 'Mitigation:' "/sys/devices/system/cpu/vulnerabilities/tsx_async_abort"; then
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if grep -Eq '(SMT mitigated|disabled)' "/sys/devices/system/cpu/vulnerabilities/tsx_async_abort"; then
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taa_mitigated=1
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else
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#Simultaneous multi-threading (aka SMT or HyperThreading) is enabled. System may be vulnerable in some environments.
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taa_mitigated=1
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_info_nol "* Disable SMT to have complete mitigation\n"
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fi
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elif grep -Eq 'Vulnerable' "/sys/devices/system/cpu/vulnerabilities/tsx_async_abort"; then
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taa_mitigated=0
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_info_nol "* For more info check Linux kernel Documentation/admin-guide/hw-vuln/tsx_async_abort.rst\n"
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elif [ -z "$msg" ]; then
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# if msg is empty, sysfs check didn't fill it, rely on our own test
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if [ "$opt_live" = 1 ]; then
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# if we're in live mode and $msg is empty, sysfs file is not there so kernel is too old
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pvulnstatus $cve VULN "Your kernel doesn't support TAA mitigation, update it"
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else
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taa_mitigated=-1
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fi
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if grep -Eq 'no microcode' "/sys/devices/system/cpu/vulnerabilities/tsx_async_abort"; then
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taa_mitigated=0
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_info_nol "* CPU microcode is needed to mitigate the vulnerability\n"
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if [ -n "$kernel_taa" ]; then
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pvulnstatus $cve OK "Your kernel supports TAA mitigation"
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else
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pvulnstatus $cve VULN "Your kernel doesn't support TAA mitigation, update it"
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fi
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fi
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else
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pstatus yellow UNKNOWN "can't find or interpret /sys/devices/system/cpu/vulnerabilities/tsx_async_abort"
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taa_mitigated=-1
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fi
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if [ $taa_mitigated = 0 ];then
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pvulnstatus "$cve" VULN
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elif [ $taa_mitigated = 1 ]; then
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pvulnstatus "$cve" OK
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else
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pvulnstatus "$cve" UNK "further action may be needed to mitigate this vulnerability. For more info check Linux kernel Documentation/admin-guide/hw-vuln/tsx_async_abort.rst"
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if [ "$opt_paranoid" = 1 ]; then
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# in paranoid mode, TSX or SMT enabled are not OK, even if TAA is mitigated
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if ! echo "$fullmsg" | grep -qF 'TSX disabled'; then
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pvulnstatus $cve VULN "TSX must be disabled for full mitigation"
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elif echo "$fullmsg" | grep -qF 'SMT vulnerable'; then
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pvulnstatus $cve VULN "SMT (HyperThreading) must be disabled for full mitigation"
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else
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pvulnstatus $cve "$status" "$msg"
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fi
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else
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pvulnstatus $cve "$status" "$msg"
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fi
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fi
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}
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