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[108.214.96.168]) by smtp.gmail.com with ESMTPSA id 00721157ae682-7a370df155csm79129167b3.36.2026.04.07.20.46.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 Apr 2026 20:46:48 -0700 (PDT) From: Sun Jian To: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, shuah@kernel.org Cc: martin.lau@linux.dev, eddyz87@gmail.com, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org, horms@kernel.org, syzbot+619b9ef527f510a57cfc@syzkaller.appspotmail.com, bpf@vger.kernel.org, netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Sun Jian Subject: [PATCH bpf v4 0/2] bpf: fix short IPv4/IPv6 handling in test_run_skb Date: Wed, 8 Apr 2026 11:46:21 +0800 Message-ID: <20260408034623.180320-1-sun.jian.kdev@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit bpf_prog_test_run_skb() may access IPv4/IPv6 network headers based on skb->protocol even when the provided test input only contains an Ethernet header. Fix it by rejecting such short IPv4/IPv6 inputs before accessing the L3 headers, and add a selftest that exercises the reported bpf_skb_adjust_room() path on ETH_HLEN-sized IPv4/IPv6 EtherType inputs. Changes in v4: - Split the selftests into a separate patch. - Rework the selftest to actually execute a BPF program calling bpf_skb_adjust_room(). - Reuse a single struct ethhdr eth_hlen and initialize h_proto from the test case table. - Add the Fixes tag to the test_run.c patch. Link: https://lore.kernel.org/bpf/CABFUUZF_CWQZrRk=L9cNxO=8Z4iSgGfXi3J=hpzeyTKDbfE2-w@mail.gmail.com/T/#mfabfe7e86bb30c0141fbc9f751b8b1cb07767f01 Sun Jian (2): bpf: reject short IPv4/IPv6 inputs in bpf_prog_test_run_skb selftests/bpf: cover short IPv4/IPv6 inputs with adjust_room net/bpf/test_run.c | 20 ++++++---- .../selftests/bpf/prog_tests/empty_skb.c | 40 +++++++++++++++++-- tools/testing/selftests/bpf/progs/empty_skb.c | 7 ++++ 3 files changed, 56 insertions(+), 11 deletions(-) base-commit: cbfffcca2bf0622b601b7eaf477aa29035169184 -- 2.43.0