FD/overwriting suid files

[nlawson () statler csc calpoly edu (Nathan Lawson)]

I always have thought that any good OS will reset any suid/sgid bits on a file
write.  Such is the case for the Solaris 2.4 machine I tested this on.  I think
any OS that doesn't do this has some deep design flaws.

wopr> touch n
wopr> ls -l n
   0 -rw-------  1 nlawson         0 Feb 13 12:19 n
wopr> chmod 7777 n
wopr> ls -l n
   0 -rwsrwsrwx  1 nlawson         0 Feb 13 12:19 n*
wopr> echo /bin/sh >> n
wopr> ls -l n
   1 -rwxrwxrwx  1 nlawson         8 Feb 13 12:19 n*

-- 
Nathan Lawson   | "One of the advantages of using UNIX to teach an operating
CSL 490 Admin   |  systems course is the sources and documentation will easily
756-7180 @Work  |  fit into a students briefcase."  -- John Lions (1976)