The recent summary of Kernel 4.15 mentioned the test for ‘compliant’ versions of GCC which fully support the retpoline mitigation, but only gave an example of non-compliance: With GCC 7.2: ~]$ cat /sys/devices/system/cpu/vulnerabilities/spectre_v2  Vulnerable: Minimal generic ASM retpoline I re-created Fedora (Rawhide) GCC 7.3.1 for Fedora 27, and it gives the following, after Kernel 4.15 compilation/boot: ~]$ … Continue reading →