Article View: net.bugs.4bsd
Article #1645Re: tip shell escape (4.3BSD)
From: Dan Lanciani
Date: Fri, 22 Aug 1986 01:51
Date: Fri, 22 Aug 1986 01:51
17 lines
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1324 bytes
In article <600@varian.UUCP>, david@varian.UUCP (David Brown) writes: > I've been having problems using tip on 4.3BSD. When I try to use any > tilde command that requires forking a shell (~!, ~$, etc.), I get: > > /bin/csh: permission denied > This is a "feature" of the C-shell. If on interactive startup it finds that its real uid != its effective uid or its real gid != its effective gid it prints this unhelpful message and exits. I assume this is supposed to prevent evil hackers from getting privileged shells. Of course, all evil hackers use sh so nothing is gained by the hack. It would make much more sense to fix the program (tip in this case) than to break the shell. Note that this also makes setuid C-shell scripts fail. Dan Lanciani ddl@harvard.*
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!mnetor!seismo!husc6!ddl From: ddl@husc6.HARVARD.EDU (Dan Lanciani) Newsgroups: net.bugs.4bsd Subject: Re: tip shell escape (4.3BSD) Message-ID: <191@husc6.HARVARD.EDU> Date: Thu, 21-Aug-86 21:51:24 EDT Article-I.D.: husc6.191 Posted: Thu Aug 21 21:51:24 1986 Date-Received: Fri, 22-Aug-86 05:38:16 EDT References: <600@varian.UUCP> Distribution: net Organization: Harvard University, Cambridge Mass Lines: 17 Summary: silly security feature...