[PATCH bpf-next v3 0/3] Separate tests that need error injection

[Viktor Malik <vmalik@redhat.com>]

Some enterprise kernels (such as RHEL) do not enable error injection via
BPF (CONFIG_FUNCTION_ERROR_INJECTION and CONFIG_BPF_KPROBE_OVERRIDE).
When running test_progs on such kernels, a lot of test cases fail since
they use sleepable fentry or fmod_ret program types which require error
injection to be enabled. While it is possible to skip these via custom
DENYLIST, some test_progs are not properly split into subtests and
therefore must be entirely skipped.

This patch series split such tests into subtests, namely module_attach
and read_vsyscall. In addition, the last patch separates a sleepable
fentry test out of the LSM test suite into a separate test so that it
can be skipped without skipping other LSM tests.

Changes in v3:
- Replace `return` by `goto cleanup` when skeleton is already open
  (found by AI review)

Changes in v2:
- Fix indices in read_vsyscall/copy_from_user subtest (reported by CI)

Viktor Malik (3):
  selftests/bpf: Split module_attach into subtests
  selftests/bpf: Split read_vsyscall into subtests
  selftests/bpf: Split sleepable fentry from LSM test

 .../bpf/prog_tests/fentry_sleepable.c         |  28 +++
 .../selftests/bpf/prog_tests/module_attach.c  | 168 +++++++++++++-----
 .../selftests/bpf/prog_tests/read_vsyscall.c  |  41 ++++-
 .../selftests/bpf/prog_tests/test_lsm.c       |   8 -
 .../selftests/bpf/progs/fentry_sleepable.c    |  28 +++
 tools/testing/selftests/bpf/progs/lsm.c       |  21 ---
 .../selftests/bpf/progs/read_vsyscall.c       |  18 +-
 .../selftests/bpf/progs/test_module_attach.c  |  63 +++----
 8 files changed, 249 insertions(+), 126 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/fentry_sleepable.c
 create mode 100644 tools/testing/selftests/bpf/progs/fentry_sleepable.c

-- 
2.53.0