[PATCH v4 00/10] x86/ibt: FineIBT-BHI

Peter Zijlstra
2025-02-24T12:46:00Z

Hi all!

Hopefully final version of these here patches.

As reported, these patches include the cfi=paranoid flag for dealing with the
FineIBT SYSCALL pivot and cfi=bhi for further hardering FineIBT.

Biggest difference since last time is the reworking (vastly simplifying) of
cfi=warn, and getting rid of the ud_type propagation in favour of using
is_cfi_trap().

As reported earlier, available at:

git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git x86/fineibt-bhi2

Previous version at:

https://lkml.kernel.org/r/20250219162107.880673196@infradead.org

---
Makefile | 3 +
arch/x86/Kconfig | 8 +
arch/x86/include/asm/bug.h | 3 +
arch/x86/include/asm/cfi.h | 10 ++
arch/x86/include/asm/ibt.h | 4 +
arch/x86/kernel/alternative.c | 370 +++++++++++++++++++++++++++++++++++++-----
arch/x86/kernel/cfi.c | 8 +-
arch/x86/kernel/traps.c | 54 +++++-
arch/x86/lib/Makefile | 3 +-
arch/x86/lib/bhi.S | 146 +++++++++++++++++
arch/x86/net/bpf_jit_comp.c | 30 ++--
include/linux/cfi.h | 2 +
kernel/cfi.c | 4 +-
13 files changed, 585 insertions(+), 60 deletions(-)