Multiple Platform remote CPU load issue in Samba 1.x and2.x

[Allen, Michael B (RSCH)]

> -----Original Message-----
> From:	Allen, Michael B (RSCH) [SMTP:Michael_B_Allen at ml.com]
> Sent:	Tuesday, June 13, 2000 8:49 PM
> To:	Multiple recipients of list SAMBA-TECHNICAL
> Subject:	RE: Multiple Platform remote CPU load issue in Samba 1.x
> and2.x
> 
> Actually could this be a kernel networking issue with linux? I'm running
> 2.2.14-5.0. If not it should be trivial to fix. Anyone with a current CVS
> checkout wanna come up with a quick patch?
	[Allen, Michael B (RSCH)]  

	A quick fix could be as simple as adding something like the
following to the netbios session code:

	if ( first two bytes != 0x81 00 ) { // session request
	     send 0x83 00 00 01 81 // negative session response
	                                      // not listening on called
name error
	     close the connection
	}

	But the real problem is that it's clear the current code isn't
validating the incoming info _at all_. It should really check the packet
type, calling name, and called name. I wonder why it doesn't barf on reading
the name though. That's why I think there might be something lower level
going on but again I haven't looked at the session service code.

	Michael B. Allen
	http://jcifs.samba.org