On 06/15/2018 08:58 AM, Xi Ruoyao wrote: > On 2018-06-15 17:42 +0300, Vassilena Treneva wrote: >> Hey, >> >> Using gcc version 4.8.5 20150623 (Red Hat 4.8.5-4) (GCC). >> >> Do you know if there are any compiler options (or a patch) to mitigate the >> so called: Meltdown and/or Spectre vulnerabilities for this specific >> version of the compiler? >> Based on what I read over the internet, the answer is NO. Such options and >> a patch are available starting from GCC 8: >> https://gcc.gnu.org/ml/gcc-patches/2018-01/msg00422.html > > The compiler has nothing to do with Meltdown and Spectre v1. For Spectre v2 > GCC 8.1 and 7.3 have -mindirect-branch option. > > GCC 4.8 is no longer supported by GCC team. Maybe Red Hat could backport > this patch for you. Red Hat has already backported ported the spectre v2 mitigations to its gcc-4.8 compilers for RHEL 7, its gcc-4.4 compilers for RHEL 6 and its gcc-4.1 compilers for RHEL 5. These compilers (and kernels which use those mitigations) are available via the usual channels. jeff
