linux/net/nfc/llcp
Mathias Krause d26d6504f2 NFC: llcp: fix info leaks via msg_name in llcp_sock_recvmsg()
The code in llcp_sock_recvmsg() does not initialize all the members of
struct sockaddr_nfc_llcp when filling the sockaddr info. Nor does it
initialize the padding bytes of the structure inserted by the compiler
for alignment.

Also, if the socket is in state LLCP_CLOSED or is shutting down during
receive the msg_namelen member is not updated to 0 while otherwise
returning with 0, i.e. "success". The msg_namelen update is also
missing for stream and seqpacket sockets which don't fill the sockaddr
info.

Both issues lead to the fact that the code will leak uninitialized
kernel stack bytes in net/socket.c.

Fix the first issue by initializing the memory used for sockaddr info
with memset(0). Fix the second one by setting msg_namelen to 0 early.
It will be updated later if we're going to fill the msg_name member.

Cc: Lauro Ramos Venancio <lauro.venancio@openbossa.org>
Cc: Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
Cc: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-04-07 16:28:02 -04:00
..
commands.c NFC: Add support for SO_TIMESTAMP LLCP socket option 2013-01-10 00:44:24 +01:00
Kconfig NFC: Remove CONFIG_EXPERIMENTAL from the LLCP Makefile 2012-10-26 18:26:52 +02:00
llcp.c NFC: llcp: Remove possible double call to kfree_skb 2013-03-20 16:46:40 +01:00
llcp.h NFC: llcp: Remove the tx backlog queue 2013-01-10 00:44:31 +01:00
sock.c NFC: llcp: fix info leaks via msg_name in llcp_sock_recvmsg() 2013-04-07 16:28:02 -04:00