Commit aaa0e57e authored by Eduard Zingerman's avatar Eduard Zingerman Committed by Alexei Starovoitov
Browse files

libbpf: __arg_untrusted in bpf_helpers.h 



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
    ...
  }

Acked-by: default avatarKumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: default avatarEduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20250704230354.1323244-6-eddyz87@gmail.com


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 182f7df7

tools/lib/bpf/bpf_helpers.h

+1 −0
Original line number Diff line number Diff line
@@ -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