[PATCHv3 bpf-next 0/5] bpf: Tracing and lsm programs re-attach

[Jiri Olsa <jolsa@kernel.org>]

hi,
while adding test for pinning the module while there's
trampoline attach to it, I noticed that we don't allow
link detach and following re-attach for trampolines.
Adding that for tracing and lsm programs.

You need to have patch [1] from bpf tree for test module
attach test to pass.

v3 changes:
  - used ASSERT* macros apart from lsm test, which is using
    CHECKs all over the place [Andrii]
  - added acks

thanks,
jirka


[1] https://lore.kernel.org/bpf/20210326105900.151466-1-jolsa@kernel.org/
---
Jiri Olsa (5):
      bpf: Allow trampoline re-attach for tracing and lsm programs
      selftests/bpf: Add re-attach test to fentry_test
      selftests/bpf: Add re-attach test to fexit_test
      selftests/bpf: Add re-attach test to lsm test
      selftests/bpf: Test that module can't be unloaded with attached trampoline

 kernel/bpf/syscall.c                                   | 23 +++++++++++++++++------
 kernel/bpf/trampoline.c                                |  2 +-
 tools/testing/selftests/bpf/prog_tests/fentry_test.c   | 51 ++++++++++++++++++++++++++++++++++++---------------
 tools/testing/selftests/bpf/prog_tests/fexit_test.c    | 51 ++++++++++++++++++++++++++++++++++++---------------
 tools/testing/selftests/bpf/prog_tests/module_attach.c | 23 +++++++++++++++++++++++
 tools/testing/selftests/bpf/prog_tests/test_lsm.c      | 48 ++++++++++++++++++++++++++++++++++++++----------
 tools/testing/selftests/bpf/test_progs.h               |  2 +-
 7 files changed, 152 insertions(+), 48 deletions(-)