[PATCH v2 bpf-next 0/3] Fix BPF verifier global subprog context argument logic

[Andrii Nakryiko <andrii@kernel.org>]

Fix kernel bug in determining whether global subprog's argument is PTR_TO_CTX,
which is done based on type names. Currently KPROBE programs are broken.

Add few tests validating that KPROBE context can be passed to global subprog.
For that also refactor test_global_funcs test to use test_loader framework.

v1->v2:
  - fix compilation warning on arm64 and s390x by force-casting ctx to
    `void *`, to discard const from `const struct user_pt_regs *`, when
    passing it to bpf_get_stack().

Andrii Nakryiko (3):
  bpf: fix global subprog context argument resolution logic
  selftests/bpf: convert test_global_funcs test to test_loader framework
  selftests/bpf: add global subprog context passing tests

 kernel/bpf/btf.c                              |  13 +-
 .../bpf/prog_tests/test_global_funcs.c        | 133 +++++-------------
 .../selftests/bpf/progs/test_global_func1.c   |   6 +-
 .../selftests/bpf/progs/test_global_func10.c  |   4 +-
 .../selftests/bpf/progs/test_global_func11.c  |   4 +-
 .../selftests/bpf/progs/test_global_func12.c  |   4 +-
 .../selftests/bpf/progs/test_global_func13.c  |   4 +-
 .../selftests/bpf/progs/test_global_func14.c  |   4 +-
 .../selftests/bpf/progs/test_global_func15.c  |   4 +-
 .../selftests/bpf/progs/test_global_func16.c  |   4 +-
 .../selftests/bpf/progs/test_global_func17.c  |   4 +-
 .../selftests/bpf/progs/test_global_func2.c   |  43 +++++-
 .../selftests/bpf/progs/test_global_func3.c   |  10 +-
 .../selftests/bpf/progs/test_global_func4.c   |  55 +++++++-
 .../selftests/bpf/progs/test_global_func5.c   |   4 +-
 .../selftests/bpf/progs/test_global_func6.c   |   4 +-
 .../selftests/bpf/progs/test_global_func7.c   |   4 +-
 .../selftests/bpf/progs/test_global_func8.c   |   4 +-
 .../selftests/bpf/progs/test_global_func9.c   |   4 +-
 .../bpf/progs/test_global_func_ctx_args.c     | 105 ++++++++++++++
 20 files changed, 292 insertions(+), 125 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/progs/test_global_func_ctx_args.c

-- 
2.30.2