[PATCH bpf-next v5 0/5] emit ENDBR/BTI instructions for indirect jump targets

[Xu Kuohai]

On x86 CPUs with CET/IBT and arm64 CPUs with BTI, missing landing pad instructions
at indirect jump targets triggers kernel panic. So emit ENDBR instructions for
indirect jump targets on x86 and BTI on arm64. Indirect jump targets are identified
based on the insn_aux_data created by the verifier.

v5:
- Switch to pass env to JIT directly to get rid of coping private insn_aux_data for
  each prog

v4: https://lore.kernel.org/all/20260114093914.2403982-1-xukuohai@xxxxxxxxxxxxxxx/
- Switch to the approach proposed by Eduard, using insn_aux_data to indentify indirect
  jump targets, and emit ENDBR on x86

v3: https://lore.kernel.org/bpf/20251227081033.240336-1-xukuohai@xxxxxxxxxxxxxxx/
- Get rid of unnecessary enum definition (Yonghong Song, Anton Protopopov)

v2: https://lore.kernel.org/bpf/20251223085447.139301-1-xukuohai@xxxxxxxxxxxxxxx/
- Exclude instruction arrays not used for indirect jumps (Anton Protopopov)

v1: https://lore.kernel.org/bpf/20251127140318.3944249-1-xukuohai@xxxxxxxxxxxxxxx/

Xu Kuohai (5):
  bpf: Move JIT for single-subprog programs to verifier
  bpf: Pass bpf_verifier_env to jit
  bpf: Add helper to detect indirect jump targets
  bpf, x86: Emit ENDBR for indirect jump targets
  bpf, arm64: Emit BTI for indirect jump target

 arch/arc/net/bpf_jit_core.c      | 19 +++----
 arch/arm/net/bpf_jit_32.c        |  4 +-
 arch/arm64/net/bpf_jit_comp.c    | 21 ++++----
 arch/loongarch/net/bpf_jit.c     |  4 +-
 arch/mips/net/bpf_jit_comp.c     |  4 +-
 arch/parisc/net/bpf_jit_core.c   |  4 +-
 arch/powerpc/net/bpf_jit_comp.c  |  4 +-
 arch/riscv/net/bpf_jit_core.c    |  4 +-
 arch/s390/net/bpf_jit_comp.c     |  4 +-
 arch/sparc/net/bpf_jit_comp_64.c |  4 +-
 arch/x86/net/bpf_jit_comp.c      | 25 +++++----
 arch/x86/net/bpf_jit_comp32.c    |  4 +-
 include/linux/bpf.h              |  2 +
 include/linux/bpf_verifier.h     | 10 ++--
 include/linux/filter.h           |  6 ++-
 kernel/bpf/core.c                | 93 ++++++++++++++++++++++++--------
 kernel/bpf/syscall.c             |  2 +-
 kernel/bpf/verifier.c            | 22 ++++++--
 18 files changed, 157 insertions(+), 79 deletions(-)

-- 
2.47.3