From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8D18247042E; Tue, 21 Jul 2026 19:52:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784663574; cv=none; b=USOxrYzQw+0ZEkwSfhujzdjWRTqGmXZJ4DJimkMEbgu2d1bKbZDbWIy/kOk6gmY2oLcU2ZHNSPHJDsqpwPitOSVCzAhZ2wj8Eu3Elsg+ivuFlDgJy52MSmKzk5hkaLrjRtPmhXZbdptNHVau+nJqXtTOcz7riGykADgf+Zhvy38= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784663574; c=relaxed/simple; bh=5TTASPgcC2t3LShlHMGX1BrVpppC9lGk3neA3+ZEX0w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=TKb2xi863WPy8X8oUbzW5tdlrhik2y60/dpKtJQBOmRqApK6DjOx1HBIQZ8fnrG396ODMw/BKAnyQNArWkbD1gQZ6i57VfhjrfXOG3UYdpVMgVJmhHVum4VRDw8a8tMpt3QaaqZjc0JcK432eSr4ZDZd4v2vFHF0s3dlTtf9fGo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=y0wqesyj; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="y0wqesyj" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E57AE1F000E9; Tue, 21 Jul 2026 19:52:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784663573; bh=9lwhaIVxGhRUMrpmszlXFkJp0p9mGFYGkGz1TQkR0og=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=y0wqesyjQ2JSyIv4nWl5Ne0fGMm9vQXuTh/+mjtLwjanRbpSzv1DTLFtw0TX94Kov 1Z7do5g/kI/7MZtNO4K/4607orzi+CotT/d4M38XzMufmsCn8OhCJthKVoThLrEH3c 60xBNXyQ8Z5Ma00+9jaBAUaBRIx9VTiz4zkydruE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Stephen Smalley , Tristan Madani , Paul Moore Subject: [PATCH 6.12 0872/1276] selinux: avoid sk_socket dereference in selinux_sctp_bind_connect() Date: Tue, 21 Jul 2026 17:21:55 +0200 Message-ID: <20260721152505.568375831@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152446.065700225@linuxfoundation.org> References: <20260721152446.065700225@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tristan Madani commit 56acfeb10019e200ab6787d01f8d7cbe0f01526f upstream. selinux_sctp_bind_connect() dereferences sk->sk_socket to pass a struct socket * to selinux_socket_bind() and selinux_socket_connect_helper(). However, when the hook is invoked from the ASCONF softirq path (sctp_process_asconf), there is no file reference guaranteeing that sk->sk_socket is non-NULL. The setsockopt callers (bindx, connectx, set_primary, sendmsg connect) hold a file reference and are not affected. Both selinux_socket_bind() and selinux_socket_connect_helper() immediately resolve sock->sk, never using the struct socket * for anything else. Refactor the inner logic into helpers that take a struct sock * directly so that selinux_sctp_bind_connect() never needs to touch sk->sk_socket at all. Cc: stable@vger.kernel.org Fixes: d452930fd3b9 ("selinux: Add SCTP support") Suggested-by: Stephen Smalley Signed-off-by: Tristan Madani Reviewed-by: Stephen Smalley Tested-by: Stephen Smalley Signed-off-by: Paul Moore Signed-off-by: Greg Kroah-Hartman --- security/selinux/hooks.c | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -4801,9 +4801,8 @@ static int selinux_socket_socketpair(str Need to determine whether we should perform a name_bind permission check between the socket and the port number. */ -static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen) +static int __selinux_socket_bind(struct sock *sk, struct sockaddr *address, int addrlen) { - struct sock *sk = sock->sk; struct sk_security_struct *sksec = selinux_sock(sk); u16 family; int err; @@ -4937,13 +4936,17 @@ err_af: return -EAFNOSUPPORT; } +static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen) +{ + return __selinux_socket_bind(sock->sk, address, addrlen); +} + /* This supports connect(2) and SCTP connect services such as sctp_connectx(3) * and sctp_sendmsg(3) as described in Documentation/security/SCTP.rst */ -static int selinux_socket_connect_helper(struct socket *sock, +static int selinux_socket_connect_helper(struct sock *sk, struct sockaddr *address, int addrlen) { - struct sock *sk = sock->sk; struct sk_security_struct *sksec = selinux_sock(sk); int err; @@ -5036,7 +5039,7 @@ static int selinux_socket_connect(struct int err; struct sock *sk = sock->sk; - err = selinux_socket_connect_helper(sock, address, addrlen); + err = selinux_socket_connect_helper(sk, address, addrlen); if (err) return err; @@ -5538,13 +5541,11 @@ static int selinux_sctp_bind_connect(str int len, err = 0, walk_size = 0; void *addr_buf; struct sockaddr *addr; - struct socket *sock; if (!selinux_policycap_extsockclass()) return 0; /* Process one or more addresses that may be IPv4 or IPv6 */ - sock = sk->sk_socket; addr_buf = address; while (walk_size < addrlen) { @@ -5573,14 +5574,14 @@ static int selinux_sctp_bind_connect(str case SCTP_PRIMARY_ADDR: case SCTP_SET_PEER_PRIMARY_ADDR: case SCTP_SOCKOPT_BINDX_ADD: - err = selinux_socket_bind(sock, addr, len); + err = __selinux_socket_bind(sk, addr, len); break; /* Connect checks */ case SCTP_SOCKOPT_CONNECTX: case SCTP_PARAM_SET_PRIMARY: case SCTP_PARAM_ADD_IP: case SCTP_SENDMSG_CONNECT: - err = selinux_socket_connect_helper(sock, addr, len); + err = selinux_socket_connect_helper(sk, addr, len); if (err) return err;