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Wed, 27 May 2026 22:26:57 -0700 (PDT) From: Taegu Ha To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: Yonghong Song , Eduard Zingerman , Kumar Kartikeya Dwivedi , Shuah Khan , bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Taegu Ha Subject: [PATCH v2 0/1] bpf: reject overlarge global subprog argument sizes Date: Thu, 28 May 2026 14:25:32 +0900 Message-ID: <20260528052533.3940181-1-hataegu0826@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260527052539.3388700-1-hataegu0826@gmail.com> References: <20260527052539.3388700-1-hataegu0826@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This rejects BTF-derived global subprog argument sizes that cannot be represented by the verifier's signed access-size API. The issue is not a large immediate in the generated BPF instruction stream. The oversized BTF pointee size wraps the caller-side PTR_TO_STACK argument check before the callee is verified with the original large mem_size. Changes in v2: - Expand the commit message to describe the caller/callee verifier mismatch. - Keep the existing size expression unchanged after adding the S32_MAX guard, as suggested by Yonghong. Taegu Ha (1): bpf: reject overlarge global subprog argument sizes kernel/bpf/verifier.c | 5 +++++ .../bpf/progs/verifier_global_subprogs.c | 17 +++++++++++++++++ 2 files changed, 22 insertions(+) -- 2.43.0