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 C2A133370EA; Tue, 21 Jul 2026 19:52:50 +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=1784663571; cv=none; b=CkFIJsCAnH2TVUfJnXCjVbma7m2rkcbAjhGZuUZqbXJvpV0YVmFYpfkgXm/d1ST+rwVMC+Kq/cHYt2+PLvMEUGj+SBBNgABAL9cyJAhngU+4mdn1sPOwFqa5trFZEKxMnstfqbVTY82+TYzT17WCEKfJAXQ842JvrR/8d4aZo7o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784663571; c=relaxed/simple; bh=pG8cOKgFTgI3RocjNQjjv1U+0jCLu+d1IGenRQWNt+Q=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=t6i9KGsVZxakiHKNjsq4Zjy6bibzstXtbrN0qBV43e0WBVSWh4wLMdHYod8gzEoMoB5e+8NbUMvvKIR1EODbxAzhCUAe8BUGLcXS2srnNAtnSejvebvNFeeUDdRYCrtGg5A0vTkIW2PypeYWuIAPoCs8d4zJRZ8jk89JSXZYd0g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=dAPXWfBE; 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="dAPXWfBE" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 342651F000E9; Tue, 21 Jul 2026 19:52:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784663570; bh=Xr0UG2mTb9cGgJTHTAODNXZCRZhfpSsIGPW9c8sq1g4=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=dAPXWfBE/F4Rx6pOpi4VfGxpJkz1N0B81B08oYDd1Fr2UyoYNl7LSWeg2LFGTUIoY 8apHz8OX9+lcTGTNDrPm/IfKP/rrfs5T2EUx4VwqG5dDBW/ai5Q/pvura15stvZ93a tetU3Ei0A+l9ZME7DlkSiEeUzmEiD3Djj+hur25s= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Bryam Vargas , Matthieu Buffet , Mikhail Ivanov , Stephen Smalley , Paul Moore Subject: [PATCH 6.12 0871/1276] selinux: check connect-related permissions on TCP Fast Open Date: Tue, 21 Jul 2026 17:21:54 +0200 Message-ID: <20260721152505.545528361@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: stable@vger.kernel.org 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: Stephen Smalley commit 44c74d27d1b9aaa99fa8a83640c1223575262b80 upstream. Similar to Landlock, SELinux was not updated when TCP Fast Open support was introduced to ensure connect-related permissions are checked when using TCP Fast Open. Update its socket_sendmsg() hook to call selinux_socket_connect() when MSG_FASTOPEN is passed. Cc: stable@vger.kernel.org Link: https://lore.kernel.org/linux-security-module/20260616201615.275032-1-hexlabsecurity@proton.me/ Link: https://lore.kernel.org/linux-security-module/20260617180526.15627-2-matthieu@buffet.re/ Reported-by: Bryam Vargas Reported-by: Matthieu Buffet Reported-by: Mikhail Ivanov Signed-off-by: Stephen Smalley Tested-by: Bryam Vargas Signed-off-by: Paul Moore Signed-off-by: Greg Kroah-Hartman --- security/selinux/hooks.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-) --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -5077,7 +5077,24 @@ static int selinux_socket_accept(struct static int selinux_socket_sendmsg(struct socket *sock, struct msghdr *msg, int size) { - return sock_has_perm(sock->sk, SOCKET__WRITE); + int rc; + struct sockaddr *const addr = msg->msg_name; + const int addrlen = msg->msg_namelen; + + rc = sock_has_perm(sock->sk, SOCKET__WRITE); + if (rc) + return rc; + + if (addr && (msg->msg_flags & MSG_FASTOPEN) && + (sk_is_tcp(sock->sk) || + (sk_is_inet(sock->sk) && sock->sk->sk_type == SOCK_STREAM && + sock->sk->sk_protocol == IPPROTO_MPTCP))) { + rc = selinux_socket_connect(sock, addr, addrlen); + if (rc) + return rc; + } + + return 0; } static int selinux_socket_recvmsg(struct socket *sock, struct msghdr *msg,