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Tue, 13 Jan 2026 13:59:46 -0800 (PST) Message-ID: <18d9b15319bf8d71a3cd5b08239529505714dc96.camel@gmail.com> Subject: Re: [PATCH bpf-next v1 03/10] bpf: Verifier support for KF_IMPLICIT_ARGS From: Eduard Zingerman To: Ihor Solodrai , Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Martin KaFai Lau Cc: Mykyta Yatsenko , Tejun Heo , Alan Maguire , Benjamin Tissoires , Jiri Kosina , bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-input@vger.kernel.org, sched-ext@lists.linux.dev Date: Tue, 13 Jan 2026 13:59:43 -0800 In-Reply-To: <20260109184852.1089786-4-ihor.solodrai@linux.dev> References: <20260109184852.1089786-1-ihor.solodrai@linux.dev> <20260109184852.1089786-4-ihor.solodrai@linux.dev> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.58.2 (3.58.2-1.fc43) Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Fri, 2026-01-09 at 10:48 -0800, Ihor Solodrai wrote: [...] > --- a/kernel/bpf/verifier.c > +++ b/kernel/bpf/verifier.c > @@ -3271,6 +3271,38 @@ static struct btf *find_kfunc_desc_btf(struct bpf_= verifier_env *env, s16 offset) > return btf_vmlinux ?: ERR_PTR(-ENOENT); > } > =20 > +#define KF_IMPL_SUFFIX "_impl" > + > +static const struct btf_type *find_kfunc_impl_proto(struct bpf_verifier_= env *env, > + struct btf *btf, > + const char *func_name) > +{ > + char impl_name[KSYM_SYMBOL_LEN]; Oh, as we discussed already, this should use env->tmp_str_buf. > + const struct btf_type *func; > + s32 impl_id; > + int len; > + > + len =3D snprintf(impl_name, sizeof(impl_name), "%s%s", func_name, KF_IM= PL_SUFFIX); > + if (len < 0 || len >=3D sizeof(impl_name)) { > + verbose(env, "function name %s%s is too long\n", func_name, KF_IMPL_SU= FFIX); > + return NULL; > + } [...]