midnight-commander-tty.txt

`Date: Sun, 6 Sep 1998 00:53:24 +0200  
From: Michal Zalewski <[email protected]>  
To: [email protected]  
Subject: Sendmail, lynx, Netscape, sshd, Linux kernel (twice)  
  
More kernel 'things' - tty allocation  
-------------------------------------  
  
Hmm, I've posted it months ago, and I have no idea why it hasn't been  
approved. Hmm, the problem: run 'mc' and enter: "ls -l `tty`". Not  
much to say. Default Linux semantics won't allow non-suid programs to  
allocate tty properly (it could be allocated, but in world-writable and  
world-readable mode). Two solutions:  
  
1. Give +s to Midnight Commander and other programs ;>  
2. Remove +s from screen, xterm, rxvt, mc ;> and use this module instead:  
http://dione.ids.pl/~lcamtuf/pliki/ttyperm.c (*Solution*)  
  
It changes Linux semantics on tty allocation to make it SYSV-alike. From  
now, you could even use non-suid screen - export SCREENDIR=~/screens in  
login scripts should be sufficient.  
  
_______________________________________________________________________  
Michal Zalewski [[email protected]] [ENSI / marchew] [dione.ids.pl SYSADM]  
[http://linux.lepszy.od.kobiety.pl/~lcamtuf/] <=--=> bash$ :(){ :|:&};:  
[voice phone: +48 (0) 22 813 25 86] ? [pager (MetroBip): 0 642 222 813]  
Iterowac jest rzecza ludzka, wykonywac rekursywnie - boska [P. Deutsch]  
`