From patchwork Mon Sep 15 22:08:02 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kamal Mostafa X-Patchwork-Id: 389768 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from huckleberry.canonical.com (huckleberry.canonical.com [91.189.94.19]) by ozlabs.org (Postfix) with ESMTP id 277F614008C; Tue, 16 Sep 2014 08:23:22 +1000 (EST) Received: from localhost ([127.0.0.1] helo=huckleberry.canonical.com) by huckleberry.canonical.com with esmtp (Exim 4.76) (envelope-from ) id 1XTeg3-0001YT-Mi; Mon, 15 Sep 2014 22:23:19 +0000 Received: from youngberry.canonical.com ([91.189.89.112]) by huckleberry.canonical.com with esmtp (Exim 4.76) (envelope-from ) id 1XTea8-0006Hi-8T for kernel-team@lists.ubuntu.com; Mon, 15 Sep 2014 22:17:12 +0000 Received: from c-76-102-4-12.hsd1.ca.comcast.net ([76.102.4.12] helo=fourier) by youngberry.canonical.com with esmtpsa (TLS1.0:DHE_RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1XTeTe-00008k-0J; Mon, 15 Sep 2014 22:10:30 +0000 Received: from kamal by fourier with local (Exim 4.82) (envelope-from ) id 1XTeTc-0002bf-7Z; Mon, 15 Sep 2014 15:10:28 -0700 From: Kamal Mostafa To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Subject: [PATCH 3.13 072/187] selinux: fix the default socket labeling in sock_graft() Date: Mon, 15 Sep 2014 15:08:02 -0700 Message-Id: <1410818997-9432-73-git-send-email-kamal@canonical.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1410818997-9432-1-git-send-email-kamal@canonical.com> References: <1410818997-9432-1-git-send-email-kamal@canonical.com> X-Extended-Stable: 3.13 Cc: Paul Moore , Kamal Mostafa X-BeenThere: kernel-team@lists.ubuntu.com X-Mailman-Version: 2.1.14 Precedence: list List-Id: Kernel team discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: kernel-team-bounces@lists.ubuntu.com Sender: kernel-team-bounces@lists.ubuntu.com 3.13.11.7 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Paul Moore commit 4da6daf4d3df5a977e4623963f141a627fd2efce upstream. The sock_graft() hook has special handling for AF_INET, AF_INET, and AF_UNIX sockets as those address families have special hooks which label the sock before it is attached its associated socket. Unfortunately, the sock_graft() hook was missing a default approach to labeling sockets which meant that any other address family which made use of connections or the accept() syscall would find the returned socket to be in an "unlabeled" state. This was recently demonstrated by the kcrypto/AF_ALG subsystem and the newly released cryptsetup package (cryptsetup v1.6.5 and later). This patch preserves the special handling in selinux_sock_graft(), but adds a default behavior - setting the sock's label equal to the associated socket - which resolves the problem with AF_ALG and presumably any other address family which makes use of accept(). Signed-off-by: Paul Moore Tested-by: Milan Broz Signed-off-by: Kamal Mostafa --- include/linux/security.h | 5 ++++- security/selinux/hooks.c | 13 +++++++++++-- 2 files changed, 15 insertions(+), 3 deletions(-) diff --git a/include/linux/security.h b/include/linux/security.h index 5623a7f..e42af21 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -987,7 +987,10 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts) * Retrieve the LSM-specific secid for the sock to enable caching of network * authorizations. * @sock_graft: - * Sets the socket's isec sid to the sock's sid. + * This hook is called in response to a newly created sock struct being + * grafted onto an existing socket and allows the security module to + * perform whatever security attribute management is necessary for both + * the sock and socket. * @inet_conn_request: * Sets the openreq's sid to socket's sid with MLS portion taken from peer sid. * @inet_csk_clone: diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 019749c..f66143d 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -4497,9 +4497,18 @@ static void selinux_sock_graft(struct sock *sk, struct socket *parent) struct inode_security_struct *isec = SOCK_INODE(parent)->i_security; struct sk_security_struct *sksec = sk->sk_security; - if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6 || - sk->sk_family == PF_UNIX) + switch (sk->sk_family) { + case PF_INET: + case PF_INET6: + case PF_UNIX: isec->sid = sksec->sid; + break; + default: + /* by default there is no special labeling mechanism for the + * sksec label so inherit the label from the parent socket */ + BUG_ON(sksec->sid != SECINITSID_UNLABELED); + sksec->sid = isec->sid; + } sksec->sclass = isec->sclass; }