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Tue, 05 Nov 2024 16:39:15 -0800 (PST) Received: from n191-036-066.byted.org ([147.160.184.86]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6d3541614e1sm66312226d6.86.2024.11.05.16.39.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 Nov 2024 16:39:15 -0800 (PST) From: zijianzhang@bytedance.com To: bpf@vger.kernel.org Cc: martin.lau@linux.dev, borisp@nvidia.com, john.fastabend@gmail.com, kuba@kernel.org, davem@davemloft.net, edumazet@google.com, pabeni@redhat.com, horms@kernel.org, mst@redhat.com, sgarzare@redhat.com, bobby.eshleman@bytedance.com, jakub@cloudflare.com, andrii@kernel.org, cong.wang@bytedance.com, jiang.wang@bytedance.com, netdev@vger.kernel.org, Zijian Zhang , Stanislav Fomichev Subject: [PATCH v3 bpf] bpf: Add sk_is_inet and IS_ICSK check in tls_sw_has_ctx_tx/rx Date: Wed, 6 Nov 2024 00:37:42 +0000 Message-Id: <20241106003742.399240-1-zijianzhang@bytedance.com> X-Mailer: git-send-email 2.20.1 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: bpf@iogearbox.net From: Zijian Zhang As the introduction of the support for vsock and unix sockets in sockmap, tls_sw_has_ctx_tx/rx cannot presume the socket passed in must be IS_ICSK. vsock and af_unix sockets have vsock_sock and unix_sock instead of inet_connection_sock. For these sockets, tls_get_ctx may return an invalid pointer and cause page fault in function tls_sw_ctx_rx. BUG: unable to handle page fault for address: 0000000000040030 Workqueue: vsock-loopback vsock_loopback_work RIP: 0010:sk_psock_strp_data_ready+0x23/0x60 Call Trace: ? __die+0x81/0xc3 ? no_context+0x194/0x350 ? do_page_fault+0x30/0x110 ? async_page_fault+0x3e/0x50 ? sk_psock_strp_data_ready+0x23/0x60 virtio_transport_recv_pkt+0x750/0x800 ? update_load_avg+0x7e/0x620 vsock_loopback_work+0xd0/0x100 process_one_work+0x1a7/0x360 worker_thread+0x30/0x390 ? create_worker+0x1a0/0x1a0 kthread+0x112/0x130 ? __kthread_cancel_work+0x40/0x40 ret_from_fork+0x1f/0x40 v2: - Add IS_ICSK check v3: - Update the commits in Fixes Fixes: 634f1a7110b4 ("vsock: support sockmap") Fixes: 94531cfcbe79 ("af_unix: Add unix_stream_proto for sockmap") Signed-off-by: Zijian Zhang Acked-by: Stanislav Fomichev Acked-by: Jakub Kicinski Reviewed-by: Cong Wang --- include/net/tls.h | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/include/net/tls.h b/include/net/tls.h index 3a33924db2bc..61fef2880114 100644 --- a/include/net/tls.h +++ b/include/net/tls.h @@ -390,8 +390,12 @@ tls_offload_ctx_tx(const struct tls_context *tls_ctx) static inline bool tls_sw_has_ctx_tx(const struct sock *sk) { - struct tls_context *ctx = tls_get_ctx(sk); + struct tls_context *ctx; + + if (!sk_is_inet(sk) || !inet_test_bit(IS_ICSK, sk)) + return false; + ctx = tls_get_ctx(sk); if (!ctx) return false; return !!tls_sw_ctx_tx(ctx); @@ -399,8 +403,12 @@ static inline bool tls_sw_has_ctx_tx(const struct sock *sk) static inline bool tls_sw_has_ctx_rx(const struct sock *sk) { - struct tls_context *ctx = tls_get_ctx(sk); + struct tls_context *ctx; + + if (!sk_is_inet(sk) || !inet_test_bit(IS_ICSK, sk)) + return false; + ctx = tls_get_ctx(sk); if (!ctx) return false; return !!tls_sw_ctx_rx(ctx);