THANKS!!! 8-) > In old Unices like SunOS 4 file like /etc/utmp (or /var/run/utmp) would > be world-writable. This file keeps records related to logins and logouts. > "strace -o tmp_file who" to see this in liunx. > > "wall" commands get issued to logged-in users on their terminals as > determined from this file. A shortcoming of a world-writable file was > that "wall" output could get written to other files by making entries > that pretend they are a current terminal. > > utempter performs the utmp edits automatically as directed by login or > PAM or whatever without allowing you to fill the file with junk or hide > by erasing records of your current session. I don't know in more detail > how it works but (apart from maybe a PAM interface) I'd imagine it's pretty > simple in the source. > ------------------------------------------------------------------------ > To unsubscribe email security-discuss-request@linuxsecurity.com > with "unsubscribe" in the subject of the message. > -- duane -- GnuPG Public Key: http://sukkha.homeip.net/pgp.html -- Fun reading: 8-) http://linuxtoday.com/search.php3?author=Duane:Dunston ------------------------------------------------------------------------ To unsubscribe email security-discuss-request@linuxsecurity.com with "unsubscribe" in the subject of the message.
