From: Eduard Zingerman <eddyz87@gmail.com>
To: bpf@vger.kernel.org, ast@kernel.org
Cc: andrii@kernel.org, daniel@iogearbox.net, martin.lau@linux.dev,
kernel-team@fb.com, yonghong.song@linux.dev,
Eduard Zingerman <eddyz87@gmail.com>,
Kumar Kartikeya Dwivedi <memxor@gmail.com>
Subject: [PATCH bpf-next v2 5/8] libbpf: __arg_untrusted in bpf_helpers.h
Date: Fri, 4 Jul 2025 16:03:51 -0700 [thread overview]
Message-ID: <20250704230354.1323244-6-eddyz87@gmail.com> (raw)
In-Reply-To: <20250704230354.1323244-1-eddyz87@gmail.com>
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: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
---
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 76b127a9f24d..80c028540656 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
--
2.49.0
next prev parent reply other threads:[~2025-07-04 23:04 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-04 23:03 [PATCH bpf-next v2 0/8] bpf: additional use-cases for untrusted PTR_TO_MEM Eduard Zingerman
2025-07-04 23:03 ` [PATCH bpf-next v2 1/8] bpf: make makr_btf_ld_reg return error for unexpected reg types Eduard Zingerman
2025-07-04 23:03 ` [PATCH bpf-next v2 2/8] bpf: rdonly_untrusted_mem for btf id walk pointer leafs Eduard Zingerman
2025-07-04 23:03 ` [PATCH bpf-next v2 3/8] selftests/bpf: ptr_to_btf_id struct walk ending with primitive pointer Eduard Zingerman
2025-07-04 23:03 ` [PATCH bpf-next v2 4/8] bpf: attribute __arg_untrusted for global function parameters Eduard Zingerman
2025-07-04 23:03 ` Eduard Zingerman [this message]
2025-07-04 23:03 ` [PATCH bpf-next v2 6/8] selftests/bpf: test cases for __arg_untrusted Eduard Zingerman
2025-07-04 23:03 ` [PATCH bpf-next v2 7/8] bpf: support for void/primitive __arg_untrusted global func params Eduard Zingerman
2025-07-04 23:03 ` [PATCH bpf-next v2 8/8] selftests/bpf: tests for __arg_untrusted void * " Eduard Zingerman
2025-07-07 15:30 ` [PATCH bpf-next v2 0/8] bpf: additional use-cases for untrusted PTR_TO_MEM patchwork-bot+netdevbpf
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