[bpf-next,v2,0/2] bpf: Allow access to const void pointer arguments in tracing programs

Message

KaFai Wan April 16, 2025, 4:17 p.m. UTC

If we try to access argument which is pointer to const void, it's an 
UNKNOWN type, verifier will fail to load.

Use is_void_or_int_ptr to check if type is void or int pointer. 
And fix selftests. 

---
KaFai Wan (2):
  bpf: Allow access to const void pointer arguments in tracing programs
  selftests/bpf: Add test to access const void pointer argument in
    tracing program

 kernel/bpf/btf.c                                     |  6 +++---
 net/bpf/test_run.c                                   |  8 +++++++-
 .../selftests/bpf/progs/verifier_btf_ctx_access.c    | 12 ++++++++++++
 3 files changed, 22 insertions(+), 4 deletions(-)

Changelog:
v1->v2: Addressed comments from jirka
- use btf_type_is_void to check if type is void
- merge is_void_ptr and is_int_ptr to is_void_or_int_ptr
- fix selftests

Some details in here:
https://lore.kernel.org/all/[e-mail]/