[PATCH bpf 0/3] bpf: Fix missed var_off related to movsx in verifier

[Yonghong Song <yonghong.song@xxxxxxxxx>]

Zac reported a verification issue ([1]) where verification unexpectedly succeeded.
This is due to missing proper var_off setting in verifier related to
movsx insn. I found another similar issue as well. This patch set fixed
both problems and added three inline asm tests to test these fixes.

  [1] https://lore.kernel.org/bpf/CAADnVQLPU0Shz7dWV4bn2BgtGdxN3uFHPeobGBA72tpg5Xoykw@xxxxxxxxxxxxxx/

Yonghong Song (3):
  bpf: Add missed var_off setting in set_sext32_default_val()
  bpf: Add missed var_off setting in coerce_subreg_to_size_sx()
  selftests/bpf: Add a few tests to cover

 kernel/bpf/verifier.c                         |  2 +
 .../selftests/bpf/progs/verifier_movsx.c      | 63 +++++++++++++++++++
 2 files changed, 65 insertions(+)

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2.43.0