Project ID: 17807


This is a variant for Fedora's kernel, replacing repoline patches with upstream's IBRS.

I built this for myself, as I'm not a big fan of retpoline as a mitigation, but perhaps others may find this useful too. Future kernels from 4.15.x series will provide both mitigations, allowing the user to choose between them.

Combined with the latest microcode_ctl package (microcode_ctl-2.1-20.fc27.x86_64), this will get you some (upstream's IBRS patch is still WIP) protection against Spectre variant #2, and a /sys/kernel/debug/x86/ibrs_enabled knob with the same semantics as described in this article:

Installation Instructions

$ sudo dnf copr enable slp/kernel-ibrs

$ sudo dnf install kernel-4.14.13-300.ibrs.fc27

$ sudo dracut --force /boot/initramfs-4.14.13-300.ibrs.fc27.x86_64.img 4.14.13-300.ibrs.fc27.x86_64

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