Possible bug in 4.1 in.comsat

[Paul John Falstad]

Has anyone heard about a bug in in.comsat in SunOS 4.1?  I'm not getting
biffed on my system.  I took a look at the binaries, and figured out that
comsat calls getpwnam() with a userid it gets from the ut_name field in
utmp.  Of course, ut_name is an 8 character buffer, so the string isn't
null terminated if the person's username is 8 characters (like mine is).
The name runs into the ut_host field, so the getpwnam fails, and comsat
segfaults.  I checked this by exec'ing /bin/login (which clears the
ut_host field), and mailing myself some things.  Biff worked fine then,
because ut_host is set to all nulls, which provides the null terminator
for the user name.

Anyone heard about this?  Or is it a bug in my head?

Paul Falstad, pfalstad at phoenix.princeton.edu PLink:HYPNOS GEnie:P.FALSTAD