linux-kernel - [PATCH bpf-next v3 0/2] bpf: Skip bounds adjustment for conditional jumps on same scalar register

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Message-ID: <20251031154107.403054-1-kafai.wan@linux.dev>
Date: Fri, 31 Oct 2025 23:41:05 +0800
From: KaFai Wan <kafai.wan@...ux.dev>
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Subject: [PATCH bpf-next v3 0/2] bpf: Skip bounds adjustment for conditional jumps on same scalar register

This small patchset is about avoid verifier bug warning when conditional
 jumps on same register when the register holds a scalar with range.

v3:
  - Enhance is_scalar_branch_taken() to handle scalar case. (Eduard)
  - Update the selftest to cover all conditional jump opcodes. (Eduard)

v2:
  https://lore.kernel.org/bpf/20251025053017.2308823-1-kafai.wan@linux.dev/
 - Enhance is_branch_taken() and is_scalar_branch_taken() to handle
   branch direction computation for same register. (Eduard and Alexei)
 - Update the selftest.
 

v1:
  https://lore.kernel.org/bpf/20251022164457.1203756-1-kafai.wan@linux.dev/
---
KaFai Wan (2):
  bpf: Skip bounds adjustment for conditional jumps on same scalar
    register
  selftests/bpf: Add test for conditional jumps on same scalar register

 kernel/bpf/verifier.c                         |  33 ++++
 .../selftests/bpf/progs/verifier_bounds.c     | 154 ++++++++++++++++++
 2 files changed, 187 insertions(+)

-- 
2.43.0