From patchwork Wed Jan 20 01:04:51 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Kamal Mostafa X-Patchwork-Id: 570330 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 C7293140BA2; Wed, 20 Jan 2016 12:15:05 +1100 (AEDT) Received: from localhost ([127.0.0.1] helo=huckleberry.canonical.com) by huckleberry.canonical.com with esmtp (Exim 4.76) (envelope-from ) id 1aLhMU-00007w-39; Wed, 20 Jan 2016 01:15:02 +0000 Received: from youngberry.canonical.com ([91.189.89.112]) by huckleberry.canonical.com with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.76) (envelope-from ) id 1aLhJ8-0006bl-Dm for kernel-team@lists.ubuntu.com; Wed, 20 Jan 2016 01:11:34 +0000 Received: from 1.general.kamal.us.vpn ([10.172.68.52] helo=fourier) by youngberry.canonical.com with esmtpsa (TLS1.0:DHE_RSA_AES_128_CBC_SHA1:16) (Exim 4.76) (envelope-from ) id 1aLhFl-0000nG-F8; Wed, 20 Jan 2016 01:08:05 +0000 Received: from kamal by fourier with local (Exim 4.82) (envelope-from ) id 1aLhFi-0008VJ-MZ; Tue, 19 Jan 2016 17:08:02 -0800 From: Kamal Mostafa To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Subject: [PATCH 3.19.y-ckt 013/160] net: add validation for the socket syscall protocol argument Date: Tue, 19 Jan 2016 17:04:51 -0800 Message-Id: <1453252038-31915-14-git-send-email-kamal@canonical.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1453252038-31915-1-git-send-email-kamal@canonical.com> References: <1453252038-31915-1-git-send-email-kamal@canonical.com> MIME-Version: 1.0 X-Extended-Stable: 3.19 Cc: Cong Wang , Kamal Mostafa , "David S. Miller" , Hannes Frederic Sowa 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: , Errors-To: kernel-team-bounces@lists.ubuntu.com Sender: kernel-team-bounces@lists.ubuntu.com 3.19.8-ckt13 -stable review patch. If anyone has any objections, please let me know. ---8<------------------------------------------------------------ From: Hannes Frederic Sowa [ Upstream commit 79462ad02e861803b3840cc782248c7359451cd9 ] 郭永刚 reported that one could simply crash the kernel as root by using a simple program: int socket_fd; struct sockaddr_in addr; addr.sin_port = 0; addr.sin_addr.s_addr = INADDR_ANY; addr.sin_family = 10; socket_fd = socket(10,3,0x40000000); connect(socket_fd , &addr,16); AF_INET, AF_INET6 sockets actually only support 8-bit protocol identifiers. inet_sock's skc_protocol field thus is sized accordingly, thus larger protocol identifiers simply cut off the higher bits and store a zero in the protocol fields. This could lead to e.g. NULL function pointer because as a result of the cut off inet_num is zero and we call down to inet_autobind, which is NULL for raw sockets. kernel: Call Trace: kernel: [] ? inet_autobind+0x2e/0x70 kernel: [] inet_dgram_connect+0x54/0x80 kernel: [] SYSC_connect+0xd9/0x110 kernel: [] ? ptrace_notify+0x5b/0x80 kernel: [] ? syscall_trace_enter_phase2+0x108/0x200 kernel: [] SyS_connect+0xe/0x10 kernel: [] tracesys_phase2+0x84/0x89 I found no particular commit which introduced this problem. CVE: CVE-2015-8543 Cc: Cong Wang Reported-by: 郭永刚 Signed-off-by: Hannes Frederic Sowa Signed-off-by: David S. Miller Signed-off-by: Kamal Mostafa --- include/net/sock.h | 1 + net/ax25/af_ax25.c | 3 +++ net/decnet/af_decnet.c | 3 +++ net/ipv4/af_inet.c | 3 +++ net/ipv6/af_inet6.c | 3 +++ net/irda/af_irda.c | 3 +++ 6 files changed, 16 insertions(+) diff --git a/include/net/sock.h b/include/net/sock.h index 6690502..1333abe 100644 --- a/include/net/sock.h +++ b/include/net/sock.h @@ -385,6 +385,7 @@ struct sock { sk_no_check_rx : 1, sk_userlocks : 4, sk_protocol : 8, +#define SK_PROTOCOL_MAX U8_MAX sk_type : 16; kmemcheck_bitfield_end(flags); int sk_wmem_queued; diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c index ca049a7..161dd3c 100644 --- a/net/ax25/af_ax25.c +++ b/net/ax25/af_ax25.c @@ -806,6 +806,9 @@ static int ax25_create(struct net *net, struct socket *sock, int protocol, struct sock *sk; ax25_cb *ax25; + if (protocol < 0 || protocol > SK_PROTOCOL_MAX) + return -EINVAL; + if (!net_eq(net, &init_net)) return -EAFNOSUPPORT; diff --git a/net/decnet/af_decnet.c b/net/decnet/af_decnet.c index 8102286..f058dc7 100644 --- a/net/decnet/af_decnet.c +++ b/net/decnet/af_decnet.c @@ -678,6 +678,9 @@ static int dn_create(struct net *net, struct socket *sock, int protocol, { struct sock *sk; + if (protocol < 0 || protocol > SK_PROTOCOL_MAX) + return -EINVAL; + if (!net_eq(net, &init_net)) return -EAFNOSUPPORT; diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c index 515f689..c9c28d7 100644 --- a/net/ipv4/af_inet.c +++ b/net/ipv4/af_inet.c @@ -259,6 +259,9 @@ static int inet_create(struct net *net, struct socket *sock, int protocol, int try_loading_module = 0; int err; + if (protocol < 0 || protocol >= IPPROTO_MAX) + return -EINVAL; + sock->state = SS_UNCONNECTED; /* Look for the requested type/protocol pair. */ diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c index e8c4400..f16a8cd 100644 --- a/net/ipv6/af_inet6.c +++ b/net/ipv6/af_inet6.c @@ -109,6 +109,9 @@ static int inet6_create(struct net *net, struct socket *sock, int protocol, int try_loading_module = 0; int err; + if (protocol < 0 || protocol >= IPPROTO_MAX) + return -EINVAL; + /* Look for the requested type/protocol pair. */ lookup_protocol: err = -ESOCKTNOSUPPORT; diff --git a/net/irda/af_irda.c b/net/irda/af_irda.c index 568edc7..1143cae 100644 --- a/net/irda/af_irda.c +++ b/net/irda/af_irda.c @@ -1086,6 +1086,9 @@ static int irda_create(struct net *net, struct socket *sock, int protocol, struct sock *sk; struct irda_sock *self; + if (protocol < 0 || protocol > SK_PROTOCOL_MAX) + return -EINVAL; + if (net != &init_net) return -EAFNOSUPPORT;