[Coco] Telnet to your CoCo.. and invite 6 of your friends

[Joel Ewy]

Willard Goosey wrote:

> ...

>> Would it be hard to write a routine that would intercept such a call

>> and disable it, or disable it in some other way?

>>     

>

> Probably the easiest way is to grab the NitrOS-9 source and replace

> F$SETID with a stub that always fails.  Or expand the system call a

> little by making it check the current user number, and only allow user

> 0 to succeed.

>

> I'm not deep enough into OS-9 kernel hacking to know what would happen

> if there were multiple modules trying to provide the same system call.

> That might or might not be handled gracefully.

>

>   


In theory, you can add new system calls by adding os9p[x] modules, and 
there are versions of os9p3 out there.  So your question is a good one:  
what if os9p3 implemented the F$SETID call?  Could that simply override 
the one in os9p2?  That would be interesting.

JCE


>> I would think that for a server there is no real

>> need to switch user IDs. 

>>     

>

> Security systems start getting complicated really quickly...

>

> Willard

>