Address sashiko reviews for BPF syscall common attributes series.

1. The tailing padding bytes in struct bpf_common_attr should be
   checked. [1]
2. There was a concurrent regression in syscall.c::map_create(). [2]
3. OPTS_VALID() was missing to validate the nested struct bpf_log_opts
   in libbpf. [3]
4. The token_fd should be -1 to avoid a valid token fd in test. [4]

A test is added to verify the fix #1.

The fix #2 is hard to be verified by test. So, I decide not to add a test
for it to avoid over-engineering.

Decide not to add a test for fix #3 to avoid over-engineering, as the
fix looks really simple.

Links:
[1] https://lore.kernel.org/bpf/20260513224823.6494FC19425@smtp.kernel.org/
[2] https://lore.kernel.org/bpf/20260512233658.CEED7C2BCB0@smtp.kernel.org/
[3] https://lore.kernel.org/bpf/20260512235629.C5CABC2BCB0@smtp.kernel.org/
[4] https://lore.kernel.org/bpf/20260513003358.55836C2BCB0@smtp.kernel.org/

Leon Hwang (5):
  bpf: Check tail zero of bpf_common_attr using offsetofend
  bpf: Fix concurrent regression in map_create()
  libbpf: Add OPTS_VALID() for log_opts in bpf_map_create
  selftests/bpf: Use -1 as token_fd in map create failure test
  selftests/bpf: Add test to verify checking padding bytes for BPF
    syscall common attributes

 kernel/bpf/syscall.c                          | 19 +++++++++----
 tools/lib/bpf/bpf.c                           |  3 ++
 .../selftests/bpf/prog_tests/map_init.c       | 28 ++++++++++++++++++-
 3 files changed, 44 insertions(+), 6 deletions(-)

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2.54.0