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android_kernel_google_msm/net/decnet
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Hannes Frederic Sowa dcf5c5397a net: add validation for the socket syscall protocol argument 
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.

Change-Id: I653fad90da54908144cc8916c2dccb1fa6f14eed
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>
2016-10-29 23:12:11 +08:00
..
netfilter security: remove the security_netlink_recv hook as it is equivalent to capable() 2012-01-05 18:53:01 -05:00
af_decnet.c net: add validation for the socket syscall protocol argument 2016-10-29 23:12:11 +08:00
dn_dev.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
dn_fib.c atomic: use <linux/atomic.h> 2011-07-26 16:49:47 -07:00
dn_neigh.c decnet: Add missing neigh->ha locking to dn_neigh_output_packet() 2012-02-01 16:34:25 -05:00
dn_nsp_in.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
dn_nsp_out.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
dn_route.c decnet: remove unused variable from dn_output() 2012-02-05 17:44:55 -05:00
dn_rules.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
dn_table.c atomic: use <linux/atomic.h> 2011-07-26 16:49:47 -07:00
dn_timer.c decnet: proper socket refcounting 2011-11-26 15:49:07 -05:00
Kconfig
Makefile
README
sysctl_net_decnet.c
TODO

README 

                       Linux DECnet Project
                      ======================

The documentation for this kernel subsystem is available in the
Documentation/networking subdirectory of this distribution and also
on line at http://www.chygwyn.com/DECnet/

Steve Whitehouse <SteveW@ACM.org>