Text File

Aucbvax.3000 fa.unix-wizards utzoo!decvax!ucbvax!unix-wizards Tue Sep 8 06:29:23 1981 setuid ignored for root >From decvax!duke!unc!smb@Berkeley Tue Sep 8 06:24:47 1981 In-real-life: Steven M. Bellovin Location: University of North Carolina at Chapel Hill

I think that the Interactive Systems scheme won't work particularly well. If, say, root -- the real root -- invokes a spooling daemon, the "standard" lock-file mechanism (creating the sucker mode 444) won't work, as root has the permission to overwrite it, regardless of what it's setuid to. Nor does it really solve the problem of creating files on behalf of the real user -- who should own them? I suspect that the "schizo" call, which flips the real and effective uids, is a better hack than granting the union of all permissions.

----------------------------------------------------------------- gopher://quux.org/ conversion by John Goerzen <jgoerzen@complete.org> of http://communication.ucsd.edu/A-News/

This Usenet Oldnews Archive article may be copied and distributed freely, provided:

1. There is no money collected for the text(s) of the articles.

2. The following notice remains appended to each copy:

The Usenet Oldnews Archive: Compilation Copyright (C) 1981, 1996 Bruce Jones, Henry Spencer, David Wiseman.