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android_kernel_samsung_msm8976/net/ax25
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Hannes Frederic Sowa 0b15bc2925 net: add validation for the socket syscall protocol argument 
[ 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@twopensource.com>
Reported-by: 郭永刚 <guoyonggang@360.cn>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-01-22 19:47:55 -08:00
..
af_ax25.c net: add validation for the socket syscall protocol argument 2016-01-22 19:47:55 -08:00
ax25_addr.c small cleanup in ax25_addr_parse() 2012-07-09 00:16:16 -07:00
ax25_dev.c net ax25: Simplify and cleanup the ax25 sysctl handling. 2012-04-20 21:22:28 -04:00
ax25_ds_in.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
ax25_ds_subr.c hlist: drop the node parameter from iterators 2013-02-27 19:10:24 -08:00
ax25_ds_timer.c hlist: drop the node parameter from iterators 2013-02-27 19:10:24 -08:00
ax25_iface.c hlist: drop the node parameter from iterators 2013-02-27 19:10:24 -08:00
ax25_in.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
ax25_ip.c net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00
ax25_out.c net: use consume_skb() in place of kfree_skb() 2012-06-04 11:27:40 -04:00
ax25_route.c net: use consume_skb() in place of kfree_skb() 2012-06-04 11:27:40 -04:00
ax25_std_in.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
ax25_std_subr.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
ax25_std_timer.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
ax25_subr.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
ax25_timer.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
ax25_uid.c hlist: drop the node parameter from iterators 2013-02-27 19:10:24 -08:00
Kconfig Update broken web addresses in the kernel. 2010-10-18 11:03:14 +02:00
Makefile
sysctl_net_ax25.c net ax25: Simplify and cleanup the ax25 sysctl handling. 2012-04-20 21:22:28 -04:00
TODO [AX25]: Remove obsolete references to BKL from TODO file. 2008-03-26 02:14:38 -07:00