[PATCH bpf-next v2 0/3] Always allow sleepable and fmod_ret programs on syscalls

[Viktor Malik <vmalik@redhat.com>]

Both sleepable and fmod_ret programs are only allowed on selected
functions. For convenience, the error injection list was originally
used.

When error injection is disabled, that list is empty and sleepable
tracing programs, as well as fmod_ret programs, are effectively
unavailable.

This patch series addresses the issue by at least enabling sleepable and
fmod_ret programs on syscalls, if error injection is disabled. More
details on why syscalls are used can be found in [1].

[1] https://lore.kernel.org/bpf/CAADnVQK6qP8izg+k9yV0vdcT-+=axtFQ2fKw7D-2Ei-V6WS5Dw@mail.gmail.com/

Changes from v1:
- Check "sys_" prefix instead of "sys" for powerpc syscalls (AI review)
- Add link to the original discussion (Kumar)
- Add explanation why arch syscall prefixes are hard-coded (Leon)

Viktor Malik (3):
  bpf: Always allow sleepable programs on syscalls
  bpf: Always allow fmod_ret programs on syscalls
  selftests/bpf: Move sleepable refcounted_kptr tests to syscalls

 kernel/bpf/verifier.c                         | 83 +++++++++++++++----
 .../selftests/bpf/progs/refcounted_kptr.c     |  4 +-
 .../bpf/progs/refcounted_kptr_fail.c          |  2 +-
 3 files changed, 72 insertions(+), 17 deletions(-)

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2.53.0