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Message-Id: <0295617f822f630711f5af03316d3cbda6e737d4.1452015822.git.jslaby@suse.cz>
Date: Tue, 5 Jan 2016 18:46:55 +0100
From: Jiri Slaby <jslaby@...e.cz>
To: stable@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
Hannes Frederic Sowa <hannes@...essinduktion.org>,
Cong Wang <cwang@...pensource.com>,
"David S . Miller" <davem@...emloft.net>,
Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 71/91] net: add validation for the socket syscall protocol argument
From: Hannes Frederic Sowa <hannes@...essinduktion.org>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
[ 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: [<ffffffff816db90e>] ? inet_autobind+0x2e/0x70
kernel: [<ffffffff816db9a4>] inet_dgram_connect+0x54/0x80
kernel: [<ffffffff81645069>] SYSC_connect+0xd9/0x110
kernel: [<ffffffff810ac51b>] ? ptrace_notify+0x5b/0x80
kernel: [<ffffffff810236d8>] ? syscall_trace_enter_phase2+0x108/0x200
kernel: [<ffffffff81645e0e>] SyS_connect+0xe/0x10
kernel: [<ffffffff81779515>] tracesys_phase2+0x84/0x89
I found no particular commit which introduced this problem.
CVE: CVE-2015-8543
Cc: Cong Wang <cwang@...pensource.com>
Reported-by: 郭永刚 <guoyonggang@....cn>
Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
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 4d631bd6fd16..41d98f1d0459 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -358,6 +358,7 @@ struct sock {
sk_no_check : 2,
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 78c474f8f615..c4ee710b2057 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 dd4d506ef923..c030d5c07178 100644
--- a/net/decnet/af_decnet.c
+++ b/net/decnet/af_decnet.c
@@ -677,6 +677,9 @@ 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 cfeb85cff4f0..09f9c045aa9c 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -288,6 +288,9 @@ static int inet_create(struct net *net, struct socket *sock, int protocol,
if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
build_ehash_secret();
+ 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 98e09df2d769..0747e1406af6 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -115,6 +115,9 @@ static int inet6_create(struct net *net, struct socket *sock, int protocol,
!inet_ehash_secret)
build_ehash_secret();
+ 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 a5e62ef57155..f8133ff5b081 100644
--- a/net/irda/af_irda.c
+++ b/net/irda/af_irda.c
@@ -1105,6 +1105,9 @@ static int irda_create(struct net *net, struct socket *sock, int protocol,
IRDA_DEBUG(2, "%s()\n", __func__);
+ if (protocol < 0 || protocol > SK_PROTOCOL_MAX)
+ return -EINVAL;
+
if (net != &init_net)
return -EAFNOSUPPORT;
--
2.6.4
--
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