On Thu, Apr 17, 2025 at 11:15:46PM +0800, KaFai Wan wrote:
> 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.
> Add a selftest to check it.
>
> ---
> 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 | 13 +++----------
> net/bpf/test_run.c | 8 +++++++-
> .../selftests/bpf/progs/verifier_btf_ctx_access.c | 12 ++++++++++++
> 3 files changed, 22 insertions(+), 11 deletions(-)
>
> Changelog:
> v2->v3: Addressed comments from jirka
> - remove duplicate checks for void pointer
> Details in here:
> https://lore.kernel.org/bpf/20250416161756.1079178-1-kafai.wan@hotmail.com/
Acked-by: Jiri Olsa <jolsa@kernel.org>
thanks,
jirka
>
> 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
> Details in here:
> https://lore.kernel.org/all/20250412170626.3638516-1-kafai.wan@hotmail.com/
>
> --
> 2.43.0
>