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([147.46.174.222]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-37645c1aeb5sm1241003a91.2.2026.06.10.01.12.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 10 Jun 2026 01:12:43 -0700 (PDT) From: Sechang Lim To: Alexei Starovoitov , Daniel Borkmann , John Fastabend , Andrii Nakryiko , Martin KaFai Lau Cc: Eduard Zingerman , Stanislav Fomichev , Kumar Kartikeya Dwivedi , Song Liu , Yonghong Song , Jiri Olsa , Shuah Khan , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Cong Wang , Emil Tsalapatis , bpf@vger.kernel.org, netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH bpf v2 0/2] bpf, sockmap: fix bpf_msg_pop_data() integer overflow Date: Wed, 10 Jun 2026 08:11:52 +0000 Message-ID: <20260610081218.506709-1-rhkrqnwk98@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit bpf_msg_pop_data() computes "u64 last = start + len" with u32 operands, so a len close to U32_MAX wraps the sum and passes the bounds check. The pop loop then walks off the end of the sk_msg scatterlist and sk_msg_shift_left() calls put_page() on the empty msg->sg.end slot. v2: - add selftest (Cong Wang) - change pop to u32 (Emil Tsalapatis) v1: - https://lore.kernel.org/all/20260609183927.4021802-1-rhkrqnwk98@gmail.com/ Sechang Lim (2): bpf, sockmap: fix integer overflow in bpf_msg_pop_data() bounds check selftests/bpf: add test for bpf_msg_pop_data() overflow net/core/filter.c | 4 +- .../selftests/bpf/prog_tests/sockmap_basic.c | 48 +++++++++++++++++++ .../bpf/progs/test_sockmap_msg_pop_data.c | 27 +++++++++++ 3 files changed, 77 insertions(+), 2 deletions(-) create mode 100644 tools/testing/selftests/bpf/progs/test_sockmap_msg_pop_data.c -- 2.43.0