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* [bpf-next v7 0/5] emit ENDBR/BTI instructions for indirect jump targets
@ 2026-03-07 10:39 Xu Kuohai
  2026-03-07 10:39 ` [bpf-next v7 1/5] bpf: Move constants blinding from JIT to verifier Xu Kuohai
                   ` (4 more replies)
  0 siblings, 5 replies; 12+ messages in thread
From: Xu Kuohai @ 2026-03-07 10:39 UTC (permalink / raw)
  To: bpf, linux-kernel, linux-arm-kernel
  Cc: Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko,
	Martin KaFai Lau, Eduard Zingerman, Yonghong Song, Puranjay Mohan,
	Anton Protopopov, Shahab Vahedi, Russell King, Tiezhu Yang,
	Hengqi Chen, Johan Almbladh, Paul Burton, Hari Bathini,
	Christophe Leroy, Naveen N Rao, Luke Nelson, Xi Wang,
	Björn Töpel, Pu Lehui, Ilya Leoshkevich, Heiko Carstens,
	Vasily Gorbik, David S . Miller, Wang YanQing

On architectures with CFI protection enabled that require landing pad
instructions at indirect jump targets, such as x86 with CET/IBT eanbled
and arm64 with BTI enabled, kernel panics when an indirect jump lands on
a target witout landing pad. Therefore, the JIT must emit landing pad
instructions for indirect jump targets.

The verifier already recognizes which instructions are indirect jump
targets during the verification phase. So we can stores this information
in env->insn_aux_data and pass it to the JIT as new parameter, so the JIT
knows which instructions are indirect jump targets.

During JIT, constants blinding is performed. It rewrites the private copy
of instructions for the JITed program, but it does not adjust the global
env->insn_aux_data array. As a result, after constants blinding, the
instruction indexes used by JIT may no longer match the indexes in
env->insn_aux_data, so the JIT can not lookup env->insn_aux_data directly.

To avoid this mistach, and considering that all existing arch-specific JITs
already implement constants blinding with largely duplicated code, move
constants blinding from JIT to generic code, before copying instructions
for each subprog.

v7:
- Move constants blinding logic back to bpf/core.c
- Compute ip address before switch statement in x86 JIT
- Clear JIT state from error path on arm64 and loongarch 

v6: https://lore.kernel.org/bpf/20260306102329.2056216-1-xukuohai@huaweicloud.com/
- Move constants blinding from JIT to verifier
- Move call to bpf_prog_select_runtime from bpf_prog_load to verifier

v5: https://lore.kernel.org/bpf/20260302102726.1126019-1-xukuohai@huaweicloud.com/
- 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@huaweicloud.com/
- 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@huaweicloud.com/
- Get rid of unnecessary enum definition (Yonghong Song, Anton Protopopov)

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

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

Xu Kuohai (5):
  bpf: Move constants blinding from JIT 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      |  37 ++------
 arch/arm/net/bpf_jit_32.c        |  43 ++-------
 arch/arm64/net/bpf_jit_comp.c    |  86 ++++++-----------
 arch/loongarch/net/bpf_jit.c     |  58 ++++--------
 arch/mips/net/bpf_jit_comp.c     |  22 +----
 arch/parisc/net/bpf_jit_core.c   |  40 ++------
 arch/powerpc/net/bpf_jit_comp.c  |  47 +++-------
 arch/riscv/net/bpf_jit_core.c    |  47 +++-------
 arch/s390/net/bpf_jit_comp.c     |  43 ++-------
 arch/sparc/net/bpf_jit_comp_64.c |  43 ++-------
 arch/x86/net/bpf_jit_comp.c      |  68 +++++---------
 arch/x86/net/bpf_jit_comp32.c    |  35 +------
 include/linux/bpf.h              |   2 +
 include/linux/bpf_verifier.h     |   9 +-
 include/linux/filter.h           |  11 ++-
 kernel/bpf/core.c                | 152 +++++++++++--------------------
 kernel/bpf/syscall.c             |   4 -
 kernel/bpf/verifier.c            |  34 ++++---
 18 files changed, 228 insertions(+), 553 deletions(-)

-- 
2.47.3



^ permalink raw reply	[flat|nested] 12+ messages in thread

end of thread, other threads:[~2026-03-09  9:23 UTC | newest]

Thread overview: 12+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2026-03-07 10:39 [bpf-next v7 0/5] emit ENDBR/BTI instructions for indirect jump targets Xu Kuohai
2026-03-07 10:39 ` [bpf-next v7 1/5] bpf: Move constants blinding from JIT to verifier Xu Kuohai
2026-03-07 17:08   ` kernel test robot
2026-03-09  9:22     ` Xu Kuohai
2026-03-07 17:23   ` kernel test robot
2026-03-07 17:23   ` kernel test robot
2026-03-07 10:39 ` [bpf-next v7 2/5] bpf: Pass bpf_verifier_env to JIT Xu Kuohai
2026-03-07 10:39 ` [bpf-next v7 3/5] bpf: Add helper to detect indirect jump targets Xu Kuohai
2026-03-07 17:14   ` bot+bpf-ci
2026-03-09  9:21     ` Xu Kuohai
2026-03-07 10:39 ` [bpf-next v7 4/5] bpf, x86: Emit ENDBR for " Xu Kuohai
2026-03-07 10:39 ` [bpf-next v7 5/5] bpf, arm64: Emit BTI for indirect jump target Xu Kuohai

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