On Thu, 3 Jul 2025 at 00:47, Eduard Zingerman <eddyz87@xxxxxxxxx> wrote:
>
> Make btf_decl_tag("arg:untrusted") available for libbpf users via
> macro. Makes the following usage possible:
>
> void foo(struct bar *p __arg_untrusted) { ... }
> void bar(struct foo *p __arg_trusted) {
> ...
> foo(p->buz->bar); // buz derefrence looses __trusted
> ...
> }
>
> Signed-off-by: Eduard Zingerman <eddyz87@xxxxxxxxx>
> ---
Acked-by: Kumar Kartikeya Dwivedi <memxor@xxxxxxxxx>
> tools/lib/bpf/bpf_helpers.h | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/tools/lib/bpf/bpf_helpers.h b/tools/lib/bpf/bpf_helpers.h
> index a50773d4616e..cd7771951a71 100644
> --- a/tools/lib/bpf/bpf_helpers.h
> +++ b/tools/lib/bpf/bpf_helpers.h
> @@ -215,6 +215,7 @@ enum libbpf_tristate {
> #define __arg_nonnull __attribute((btf_decl_tag("arg:nonnull")))
> #define __arg_nullable __attribute((btf_decl_tag("arg:nullable")))
> #define __arg_trusted __attribute((btf_decl_tag("arg:trusted")))
> +#define __arg_untrusted __attribute((btf_decl_tag("arg:untrusted")))
> #define __arg_arena __attribute((btf_decl_tag("arg:arena")))
>
> #ifndef ___bpf_concat
> --
> 2.47.1
>
>
