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From: mdm@cocktrice.uucp (Mike Mitchell)
Newsgroups: comp.os.minix
Subject: FS bug?
Message-ID: <1990Dec21.003030.4379@cocktrice.uucp>
Date: 21 Dec 90 00:30:30 GMT
Organization: Mike's Playground, Santa Fe, New Mexico
Lines: 27

After having installed Bruce Evan's patches for 386/Minix, I have noticed
one problem. I think that this may be a generic problem with either fs or
mm, however I have not yet found the offending code.

I have been attempting to install uupc; I desired to have all executables
in /bin and /usr/bin protected in such a manner that only the execute bit
is on. I changed the mode of all files to reflect the fact that group and
world read/write bits had been removed.

login cannot exec /bin/sh when it has been changed to 511; this makes it
impossible for a user account to be created and used. When I changed the
protections of /bin/sh to 555, login was able to exec the shell and allow
the user to login. When the login had succeeded in execing a copy of /bin/sh
the next problem to crop up was 'ls: cannot execute'. By changing the
mode of ls from 511 to 555, it began to work.

Having files readable by group and world is defeats the purpose of having
the execute bit the only one set. I would really like to keep user accounts
from being able to access the binaries.

What am I doing incorrectly? Is there a patch to fix this? Thank you very
much for your time and effort.

-- 
Mike Mitchell                             Mail: ...!uunet!dmk3b1!cocktrice!mdm
2020 Calle Lorca #43                                   Phone: (505) 471-7639 H
Santa Fe, New Mexico 87505                                    (505) 473-4482 W