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Sat, 15 Aug 2026 23:53:01 -0700 (PDT) Message-ID: <1c60a15ad8013b49e0fea8eb3308b2a83ef5a2d6.camel@gmail.com> Subject: Re: [PATCH bpf-next v1 06/14] bpf: Correct kfunc argument diagnostics From: Eduard Zingerman To: Kumar Kartikeya Dwivedi , bpf@vger.kernel.org Cc: Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Emil Tsalapatis , kkd@meta.com, kernel-team@meta.com Date: Sat, 15 Aug 2026 23:52:57 -0700 In-Reply-To: <20260816015746.2632990-7-memxor@gmail.com> References: <20260816015746.2632990-1-memxor@gmail.com> <20260816015746.2632990-7-memxor@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2-10 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Sun, 2026-08-16 at 03:57 +0200, Kumar Kartikeya Dwivedi wrote: > The Call Type Safety diagnostics mishandle three kfunc argument classes. >=20 > BTF type ID 0 represents void, but btf_show_name() also uses zero to end > type traversal. A pointer that resolves to void therefore loses its point= ee > name and is rendered as "()". End traversal directly for concrete termina= l > types, but resolve referenced types before testing for ID zero, and name = the > void terminal type explicitly. Format the complete parameter pointer type > for nullable kfunc arguments, so void pointers are reported as (void *). >=20 > Also add the missing structured report when an __szk memory-size argument= is > not a verifier-known constant. Describe the generic bpf_refcount_acquire(= ) > contract without deriving an object type from its void pointer prototype. >=20 > Link: https://lore.kernel.org/bpf/668871823f90f69896d3db27b56db2f53e48116= 2.camel@gmail.com/ > Signed-off-by: Kumar Kartikeya Dwivedi > --- Acked-by: Eduard Zingerman ...