Add __arg_trusted to annotate global func args that accept trusted
PTR_TO_BTF_ID arguments.
Also add __arg_maybe_null to combine with __arg_trusted (and maybe other
tags in the future) to force global subprog itself (i.e., callee) to do
NULL checks, as opposed to default non-NULL semantics (and thus caller's
responsibility to ensure non-NULL values).
Acked-by: Eduard Zingerman <eddyz87@xxxxxxxxx>
Signed-off-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
---
tools/lib/bpf/bpf_helpers.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/tools/lib/bpf/bpf_helpers.h b/tools/lib/bpf/bpf_helpers.h
index 2324cc42b017..5f5901187c94 100644
--- a/tools/lib/bpf/bpf_helpers.h
+++ b/tools/lib/bpf/bpf_helpers.h
@@ -190,6 +190,8 @@ enum libbpf_tristate {
#define __arg_ctx __attribute__((btf_decl_tag("arg:ctx")))
#define __arg_nonnull __attribute((btf_decl_tag("arg:nonnull")))
+#define __arg_maybe_null __attribute((btf_decl_tag("arg:maybe_null")))
+#define __arg_trusted __attribute((btf_decl_tag("arg:trusted")))
#ifndef ___bpf_concat
#define ___bpf_concat(a, b) a ## b
--
2.34.1
