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To mitigate Spectre Variant 2, GCC needs to have retpoline support (-mindirect-branch and -mfunction-return arguments on amd64 and i386). Patches were pulled from H.J. Lu's backport branch to 4.9 (hjl/indirect/gcc-4_9-branch), available at https://github.com/hjl-tools/gcc/tree/hjl/indirect/gcc-4_9-branch/master. Upstream GCC does not apply patches to anything older than the gcc-6-branch. H.J. Lu is the author of the upstream retpoline commits as well. Several Linux distributions already backported these patches to GCC 4 branches and some old kernels (3.13 for instance) have been recompiled with these GCC patches. These kernels only allow to load kernel modules that are compiled with the retpoline support. References: - Ubuntu bug: https://bugs.launchpad.net/ubuntu/+source/gcc-4.8/+bug/1749261 - Ubuntu package: https://launchpad.net/ubuntu/+source/gcc-4.8/4.8.4-2ubuntu1~14.04.4 Fixes #38394
Nixpkgs is a collection of packages for the Nix package manager. It is periodically built and tested by the Hydra build daemon as so-called channels. To get channel information via git, add nixpkgs-channels as a remote:
% git remote add channels git://github.com/NixOS/nixpkgs-channels.git
For stability and maximum binary package support, it is recommended to maintain
custom changes on top of one of the channels, e.g. nixos-18.03 for the latest
release and nixos-unstable for the latest successful build of master:
% git remote update channels
% git rebase channels/nixos-18.03
For pull-requests, please rebase onto nixpkgs master.
NixOS Linux distribution source code is located inside
nixos/ folder.
- NixOS installation instructions
- Documentation (Nix Expression Language chapter)
- Manual (How to write packages for Nix)
- Manual (NixOS)
- Community maintained wiki
- Continuous package builds for unstable/master
- Continuous package builds for 18.03 release
- Tests for unstable/master
- Tests for 18.03 release
Communication: