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 →
I had been using the armv7hl-mandriva-linux-gnueabi- cross-compiler, but that gcc version is a bit out-of-date now (version 4.6.1). I found a more recent version, for Fedora, here: http://rpmfind.net//linux/RPM/fedora/updates/testing/21/x86_64/g/gcc-arm-linux-gnu-4.9.2-3.fc21.x86_64.html Using yum, this will also install binutils-arm-linux-gnu-2.25-3.fc21.x86_64 and cross-gcc-common-4.9.2-3.fc21.noarch and cross-binutils-common-2.25-3.fc21.noarch, to prvide the rest of the cross-compile environment. It should be noted that this is only suitable for … Continue reading →