bsdsocket_library crashes on DEBIAN
 

Hello gurus!!
A very nasty and easily reproductible bug...

- install Xubuntu on a virtual machine
- install fs-uae via apt-get
- emulate AmigaOS 3.1 + KICK 3.1 with bsdsocket_library = 1
- spawn a TELNETD via INETD (Amitcp 3 Aminet version)
- "telnet localhost" on another terminal

--> *** buffer overflow detected ***: terminated <---

More info (and tears) here:
https://github.com/FrodeSolheim/fs-uae/issues/327
(issue filed by me)

Any clues?
Many thanks!!!

This will probably not help, but it wont cost you much to try.

Have seen variants of UAE crash from misbehaving Amiga programs before. So I was thinking, that if it is the same telnetd as in this thread http://eab.abime.net/showthread.php?t=112069 it could very well be some secondary issue caused by overrunning the stack and doing random stuff in conjunction with the call over to the host Linux OS TCP/IP-stack.

So see if it helps giving telnetd a larger stack, should be possible via the inetd config. Else try something like stackattack on aminet.

Thank you!!

Not sure how to specify stack size in AMITCP inetd.conf...

Tried with "stackattack_020 MIN=131072" invoked in CLI without success!

Some progress...

Serving services over unpriviledged ports seems to fix the issue.

By the way... AmiTcp "services file" won't honor ports numbers specified!

It just ignores the directive:

telnet 1023/tcp

and goes on serving telnet on 23/tcp.

What's wrong with my "services" config??

So...

newshell TCP:1023

kinda works... It won't crash fs-uae!

But with known limitations, e.g. having to add ";" at line end to interact.

Disregard above post!

newshell TCP:23

works OK!

What remains to be sorted out is why the VERY SAME setup works on WinUAE while it crashes FS-UAE.

(same DH0: folder, same Kickstart, bsdsocket_library = 1)

Solved!!!
 

Thanks Patrik for putting me on the right track!

Offending code was on guest side.

I replaced "inetd" binary with a more recent one and problem disappeared.

Original - crashing - inetd downloaded from:
http://aminet.net/package/comm/net/AmiTCP-bin-30b2

Working inetd downloaded from:
http://aminet.net/package/comm/tcp/AmiTCP-demo-40

Thanks again Patrik :)

Cheers! :) Good work finding the problem!