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Thu, 27 Aug 2026 11:02:01 -0700 (PDT) Received: from lvondent-mobl5 ([72.188.211.115]) by smtp.gmail.com with ESMTPSA id a1e0cc1a2514c-97ccc0f4963sm3695458241.12.2026.08.27.11.02.00 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 27 Aug 2026 11:02:00 -0700 (PDT) From: Luiz Augusto von Dentz To: linux-bluetooth@vger.kernel.org Subject: [PATCH v1 2/2] Bluetooth: ISO: require CAP_NET_BIND_SERVICE to bind Date: Thu, 27 Aug 2026 14:01:49 -0400 Message-ID: <20260827180149.415744-2-luiz.dentz@gmail.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260827180149.415744-1-luiz.dentz@gmail.com> References: <20260827180149.415744-1-luiz.dentz@gmail.com> Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Luiz Augusto von Dentz ISO sockets have no PSM or port namespace: binding one reserves the ability to accept any incoming CIS or to sync to broadcast streams on the adapter. That is equivalent to listening on a well-known service, which L2CAP already restricts to CAP_NET_BIND_SERVICE in l2cap_validate_bredr_psm()/l2cap_validate_le_psm(). Apply the same restriction to iso_sock_bind() so unprivileged processes can no longer hijack incoming ISO links. Fixes: ccf74f2390d6 ("Bluetooth: Add BTPROTO_ISO socket type") Signed-off-by: Luiz Augusto von Dentz --- net/bluetooth/iso.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/net/bluetooth/iso.c b/net/bluetooth/iso.c index 75bfd5938b2e..4e1e34ffc294 100644 --- a/net/bluetooth/iso.c +++ b/net/bluetooth/iso.c @@ -1200,6 +1200,13 @@ static int iso_sock_bind(struct socket *sock, struct sockaddr_unsized *addr, addr->sa_family != AF_BLUETOOTH) return -EINVAL; + /* Binding an ISO socket reserves the ability to accept any incoming + * CIS/BIS on the adapter, so restrict it in the same way L2CAP + * restricts well-known PSMs. + */ + if (!capable(CAP_NET_BIND_SERVICE)) + return -EACCES; + lock_sock(sk); if ((sk->sk_state == BT_CONNECT2 || sk->sk_state == BT_CONNECTED) && -- 2.54.0