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Tue, 20 Oct 2026 08:59:00 -0700 (PDT) Received: from mtardy-friendly-lvh-runner.europe-west1-c.c.cilium-dev.internal ([2600:1900:4010:1a8::]) by smtp.googlemail.com with ESMTPSA id 5b1f17b1804b1-4a1fb83ff02sm5627335e9.6.2026.10.20.08.58.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 Oct 2026 08:58:59 -0700 (PDT) From: Mahe Tardy To: bpf@vger.kernel.org Cc: andrii@kernel.org, ast@kernel.org, daniel@iogearbox.net, davem@davemloft.net, willemb@google.com, eddyz87@gmail.com, edumazet@google.com, john.fastabend@gmail.com, kuba@kernel.org, horms@kernel.org, liamwisehart@meta.com, martin.lau@linux.dev, pabeni@redhat.com, song@kernel.org, netdev@vger.kernel.org, sdf.kernel@gmail.com, yonghong.song@linux.dev, jolsa@kernel.org, kuniyu@google.com, memxor@gmail.com, emil@etsalapatis.com, almagui@kernel.org, Mahe Tardy Subject: [PATCH bpf-next v2 3/3] selftests/bpf: Test forbidden bpf_ksock_sendto() LSM attach Date: Tue, 20 Oct 2026 15:58:48 +0000 Message-ID: <20261020155848.75711-4-mahe.tardy@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261020155848.75711-1-mahe.tardy@gmail.com> References: <20261020155848.75711-1-mahe.tardy@gmail.com> X-Mailing-List: bpf@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Similarly to '7b0dfbf5776b ("selftests/bpf: Test forbidden bpf_ksock_send() LSM attach")', tests that the verifier filter prevents bpf_ksock_sendto() to be called in a LSM program attached to security_socket_sendmsg() as it would create a direct recursion. Signed-off-by: Mahe Tardy --- .../selftests/bpf/progs/ksock_lsm_verifier.c | 25 ++++++++++++++++++- 1 file changed, 24 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/bpf/progs/ksock_lsm_verifier.c b/tools/testing/selftests/bpf/progs/ksock_lsm_verifier.c index fd2ccfdb5802..9533570eb340 100644 --- a/tools/testing/selftests/bpf/progs/ksock_lsm_verifier.c +++ b/tools/testing/selftests/bpf/progs/ksock_lsm_verifier.c @@ -12,7 +12,7 @@ char send_data[11] = "dummy data"; SEC("lsm.s/socket_sendmsg") __description("bpf_ksock_send is rejected from socket_sendmsg LSM hook") __failure __msg("calling kernel function bpf_ksock_send is not allowed") -int BPF_PROG(ksock_socket_sendmsg, struct socket *sock, struct msghdr *msg, +int BPF_PROG(socket_sendmsg_ksock_send, struct socket *sock, struct msghdr *msg, int size, int ret) { struct __ksock_ctx_value *v; @@ -32,4 +32,27 @@ int BPF_PROG(ksock_socket_sendmsg, struct socket *sock, struct msghdr *msg, return ret; } +SEC("lsm.s/socket_sendmsg") +__description("bpf_ksock_sendto is rejected from socket_sendmsg LSM hook") +__failure __msg("calling kernel function bpf_ksock_sendto is not allowed") +int BPF_PROG(socket_sendmsg_ksock_sendto, struct socket *sock, + struct msghdr *msg, int size, int ret) +{ + struct __ksock_ctx_value *v; + struct bpf_ksock *ks; + + v = ksock_ctx_value_lookup(); + if (!v) + return ret; + + ks = bpf_kptr_xchg(&v->ctx, NULL); + if (!ks) + return ret; + + bpf_ksock_sendto(ks, send_data, sizeof(send_data), NULL, 0); + bpf_ksock_release(ks); + + return ret; +} + char __license[] SEC("license") = "GPL"; -- 2.43.0