linux-kernel - [PATCH bpf-next v2 0/2] bpf: Skip bounds adjustment for conditional jumps on same register

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Message-ID: <20251025053017.2308823-1-kafai.wan@linux.dev>
Date: Sat, 25 Oct 2025 13:30:15 +0800
From: KaFai Wan <kafai.wan@...ux.dev>
To: ast@...nel.org,
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Cc: KaFai Wan <kafai.wan@...ux.dev>
Subject: [PATCH bpf-next v2 0/2] bpf: Skip bounds adjustment for conditional jumps on same register

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

v2:
 - 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 register
  selftests/bpf: Add test for BPF_JGT on same register

 kernel/bpf/verifier.c                         | 32 +++++++++++++++++++
 .../selftests/bpf/progs/verifier_bounds.c     | 18 +++++++++++
 2 files changed, 50 insertions(+)

-- 
2.43.0