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@@ -5,29 +5,34 @@ A simple shell script to tell if your Linux installation is vulnerable against the 3 "speculative execution" CVEs: CVE-2017-5753 bounds check bypass (Spectre Variant 1) - Impact: Kernel & all software - Mitigation: recompile software *and* kernel with a modified compiler that introduces the LFENCE opcode at the proper positions in the resulting code - Performance impact of the mitigation: negligible + + - Impact: Kernel & all software + - Mitigation: recompile software *and* kernel with a modified compiler that introduces the LFENCE opcode at the proper positions in the resulting code + - Performance impact of the mitigation: negligible CVE-2017-5715: branch target injection (Spectre Variant 2) - Impact: Kernel - Mitigation 1: new opcode via microcode update that should be used by up to date compilers to protect the BTB (by flushing indirect branch predictors) - Mitigation 2: introducing "retpoline" into compilers, and recompile software/OS with it - Performance impact of the mitigation: high for mitigation 1, medium for mitigation 2, depending on your CPU + + - Impact: Kernel + - Mitigation 1: new opcode via microcode update that should be used by up to date compilers to protect the BTB (by flushing indirect branch predictors) + - Mitigation 2: introducing "retpoline" into compilers, and recompile software/OS with it + - Performance impact of the mitigation: high for mitigation 1, medium for mitigation 2, depending on your CPU CVE-2017-5754: rogue data cache load (Meltdown) - Impact: Kernel - Mitigation: updated kernel (with PTI/KPTI patches), updating the kernel is enough - Performance impact of the mitigation: low to medium + + - Impact: Kernel + - Mitigation: updated kernel (with PTI/KPTI patches), updating the kernel is enough + - Performance impact of the mitigation: low to medium Example of the output of the script: -Spectre and Meltdown mitigation detection tool v0.01 ``` +$ sudo ./spectre-meltdown-checker.sh +Spectre and Meltdown mitigation detection tool v0.02 + CVE-2017-5753 [bounds check bypass] aka 'Spectre Variant 1' -* Kernel recompiled with LFENCE opcode insertion: UNKNOWN (check not yet implemented) -> STATUS: UNKNOWN (not implemented, but real answer is most probably VULNERABLE at this stage) +* Kernel compiled with LFENCE opcode inserted at the proper places: NO (only 38 opcodes found, should be >= 60) +> STATUS: VULNERABLE CVE-2017-5715 [branch target injection] aka 'Spectre Variant 2' * Mitigation 1 @@ -36,8 +41,8 @@ CVE-2017-5715 [branch target injection] aka 'Spectre Variant 2' * IBRS enabled for Kernel space: NO * IBRS enabled for User space: NO * Mitigation 2 -* Kernel recompiled with retpoline: UNKNOWN (check not yet implemented) -> STATUS: VULNERABLE (IBRS hardware + kernel support OR retpoline-compiled kernel are needed to mitigate the vulnerability) +* Kernel recompiled with retpolines: UNKNOWN (check not yet implemented) +> STATUS: VULNERABLE (IBRS hardware + kernel support OR retpolines-compiled kernel are needed to mitigate the vulnerability) CVE-2017-5754 [rogue data cache load] aka 'Meltdown' aka 'Variant 3' * Kernel supports Page Table Isolation (PTI): YES |