On 30 January 2018 at 15:23, Elimar Riesebieter <riese...@lxtec.de> wrote:
> * rhkra...@gmail.com <rhkra...@gmail.com> [2018-01-29 10:47 -0500]: > > [...] > > On the other hand, if I download kernel source, I would need GCC, and a > > version that is sufficient for the code. > > One can check the compiler version the running kernel is built with > by: > > $ cat /proc/version > Linux version 4.14.15-toy-lxtec-amd64 (riesebie@toy) (gcc version 7.3.0 > (Debian 7.3.0-1)) #1 SMP Tue Jan 30 14:20:49 CET 2018 > That is a very useful command. I ran it myself. djt /home/mikef/spectre-meltdown-checker # cat /proc/version Linux version 4.14.14-gentoo (root@djt) (gcc version 7.2.0 (Gentoo 7.2.0-r1)) #1 SMP Tue Jan 23 13:06:23 GMT 2018 Here is a bit of the output from the spectre patch checker: * Mitigation 2 * Kernel compiled with retpoline option: YES * Kernel compiled with a retpoline-aware compiler: NO (kernel reports minimal retpoline compilation) * Retpoline enabled: YES > STATUS: VULNERABLE (Vulnerable: Minimal AMD ASM retpoline) As can be seen here, the compiler I used to create this kernel was not recent enough to make retpoline work. Since I now have gcc 7.3 installed I will do kernel upgrade in a little while and see if I can change the NO in "* Kernel compiled with a retpoline-aware compiler: NO (kernel reports minimal retpoline compilation)" to YES..... I think it will work. Cheers MF > > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > > Elimar > -- > You cannot propel yourself forward by > patting yourself on the back. > >
