mirror of
https://github.com/speed47/spectre-meltdown-checker.git
synced 2026-06-06 06:33:04 +02:00
Stéphane Lesimple
57 lines
2.8 KiB
Bash
57 lines
2.8 KiB
Bash
# vim: set ts=4 sw=4 sts=4 et:
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###############################
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# CVE-2024-45332, BPI, Branch Privilege Injection
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check_CVE_2024_45332() {
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check_cve 'CVE-2024-45332'
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}
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check_CVE_2024_45332_linux() {
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local status sys_interface_available msg
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status=UNK
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sys_interface_available=0
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msg=''
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# There is no dedicated sysfs file for this vulnerability, and no kernel
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# mitigation code. The fix is purely a microcode update that corrects the
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# asynchronous branch predictor update timing so that eIBRS and IBPB work
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# as originally intended. There is no new CPUID bit, MSR bit, or ARCH_CAP
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# flag to detect the fix, so we hardcode known-fixing microcode versions
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# per CPU (see bpi_ucode_list in is_cpu_affected).
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# shellcheck disable=SC2154
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if ! is_cpu_affected "$cve"; then
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pvulnstatus "$cve" OK "your CPU vendor reported your CPU model as not affected"
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elif [ -z "$g_bpi_fixed_ucode_version" ]; then
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# CPU matched the model blacklist but has no known fixing microcode
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# (likely an EOL stepping that Intel won't release a fix for)
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pvulnstatus "$cve" VULN "your CPU is affected and no microcode update is available for your CPU stepping"
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explain "CVE-2024-45332 (Branch Privilege Injection) is a race condition in the branch predictor\n" \
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"that undermines eIBRS and IBPB protections. The fix is a microcode update, but no\n" \
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"update is available for your specific CPU stepping."
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else
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pr_info_nol "* BPI is mitigated by microcode: "
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if [ -z "$cpu_ucode" ]; then
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pstatus yellow UNKNOWN "couldn't get your microcode version"
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pvulnstatus "$cve" UNK "couldn't detect microcode version to verify mitigation"
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elif [ "$cpu_ucode" -lt "$g_bpi_fixed_ucode_version" ]; then
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pstatus yellow NO "You have ucode $(printf "0x%x" "$cpu_ucode") and version $(printf "0x%x" "$g_bpi_fixed_ucode_version") minimum is required"
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pvulnstatus "$cve" VULN "Your microcode is too old to mitigate the vulnerability"
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explain "CVE-2024-45332 (Branch Privilege Injection) is a race condition in the branch predictor\n" \
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"that undermines eIBRS and IBPB protections. The fix is a microcode update only.\n" \
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"No kernel changes are required."
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else
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pstatus green YES "You have ucode $(printf "0x%x" "$cpu_ucode") which is recent enough (>= $(printf "0x%x" "$g_bpi_fixed_ucode_version"))"
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pvulnstatus "$cve" OK "Your microcode mitigates the vulnerability"
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fi
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fi
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}
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check_CVE_2024_45332_bsd() {
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if ! is_cpu_affected "$cve"; then
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pvulnstatus "$cve" OK "your CPU vendor reported your CPU model as not affected"
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else
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pvulnstatus "$cve" UNK "your CPU is affected, but mitigation detection has not yet been implemented for BSD in this script"
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fi
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}
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