On Tue, 14 Dec 2004, Paul Starzetz wrote:

> The Linux kernel provides a powerful socket API to user applications.
> Among other functions sockets provide an universal way for IPC and user-
> kernel communication. The socket layer uses several logical sublayers.
> One of the layers, so called auxiliary message layer (or scm layer),
> augments the socket API by an universal user-kernel message passing
> capability (see recvfrom(2) for more details on auxiliary messages).

More nasties might be lurking nearby (at least in 2.4):

- additional, almost identical, copies of cmsg parsing code appear in
ip_cmsg_send() (net/ipv4/ip_sockglue.c) and datagram_send_ctl()
(net/ipv6/datagram.c)

- sys_sendmsg() (net/socket.c) is willing to allocate almost arbitrary
large blocks of kernel memory

--Pavel Kankovsky aka Peak [ Boycott Microsoft--http://www.vcnet.com/bms ]
"Resistance is futile. Open your source code and prepare for assimilation."

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