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([2605:8d80:58a5:c474:f5cf:239:70ad:a743]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-cbdba447107sm194328a12.21.2026.07.28.18.40.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 28 Jul 2026 18:41:05 -0700 (PDT) Message-ID: Subject: Re: [PATCH bpf-next v1 8/8] resolve_btfids: Enforce consistent kfunc flags across BTF ID sets From: Eduard Zingerman To: Ihor Solodrai , Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Kumar Kartikeya Dwivedi Cc: Benjamin Tissoires , Jiri Kosina , Emil Tsalapatis , Jiri Olsa , bpf@vger.kernel.org, linux-input@vger.kernel.org, kernel-team@meta.com Date: Tue, 28 Jul 2026 18:40:46 -0700 In-Reply-To: <20260722233518.778854-9-ihor.solodrai@linux.dev> References: <20260722233518.778854-1-ihor.solodrai@linux.dev> <20260722233518.778854-9-ihor.solodrai@linux.dev> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.52.3-0ubuntu1.1 Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 eOn Wed, 2026-07-22 at 16:35 -0700, Ihor Solodrai wrote: > A kfunc may be listed in several BTF ID sets, which is expected > because different kfuncs are available to BPF programs depending on > their type. >=20 > However kfunc flags across different BTF ID sets must be consistent [1]. > The flags should be considered a part of the kfunc declaration, > because they influence its BTF representation and verifier handling. >=20 > Enforce the kfunc flag consistency in resolve_btifds by hard failing > on error and blocking kernel (or module) build. >=20 > [1] https://lore.kernel.org/bpf/9b2196dd-443b-4632-ae11-030cdbdc59b4@linu= x.dev/ >=20 > Signed-off-by: Ihor Solodrai > --- Reviewed-by: Eduard Zingerman ...