selftests/bpf: Add test for scalar id on sign-extending stack fill

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Add a verifier test where a spilled scalar is filled once via a sign-
extending load (BPF_MEMSX) and once via a zero-extending load (BPF_MEM).
The two destination registers must not share a scalar id.

  # LDLIBS=-static PKG_CONFIG='pkg-config --static' ./vmtest.sh -- ./test_progs -t verifier_scalar_ids
  [...]
  #643/1   verifier_scalar_ids/linked_regs_bpf_k:OK
  #643/2   verifier_scalar_ids/linked_regs_bpf_x_src:OK
  #643/3   verifier_scalar_ids/linked_regs_bpf_x_dst:OK
  #643/4   verifier_scalar_ids/linked_regs_broken_link:OK
  #643/5   verifier_scalar_ids/precision_many_frames:OK
  #643/6   verifier_scalar_ids/precision_stack:OK
  #643/7   verifier_scalar_ids/precision_two_ids:OK
  #643/8   verifier_scalar_ids/linked_regs_too_many_regs:OK
  #643/9   verifier_scalar_ids/linked_regs_broken_link_2:OK
  #643/10  verifier_scalar_ids/cjmp_no_linked_regs_trigger:OK
  #643/11  verifier_scalar_ids/check_ids_in_regsafe:OK
  #643/12  verifier_scalar_ids/check_ids_in_regsafe_2:OK
  #643/13  verifier_scalar_ids/no_scalar_id_for_const:OK
  #643/14  verifier_scalar_ids/no_scalar_id_for_const32:OK
  #643/15  verifier_scalar_ids/ignore_unique_scalar_ids_cur:OK
  #643/16  verifier_scalar_ids/ignore_unique_scalar_ids_old:OK
  #643/17  verifier_scalar_ids/two_nil_old_ids_one_cur_id:OK
  #643/18  verifier_scalar_ids/two_old_ids_one_cur_id:OK
  #643/19  verifier_scalar_ids/linked_regs_and_subreg_def:OK
  #643/20  verifier_scalar_ids/ldsx_fill_scalar_id_not_shared:OK
  #643     verifier_scalar_ids:OK
  Summary: 1/20 PASSED, 0 SKIPPED, 0 FAILED

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>

...

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Daniel Borkmann 2026-07-09 17:31:31 +02:00 • committed by Eduard Zingerman

parent 2cb5f4ca69

commit c3d5ef291a

1 changed files with 56 additions and 0 deletions

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tools/testing/selftests/bpf/progs/verifier_scalar_ids.c

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