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Re: Reminder: $EDITOR with spaces?

From: Karl Fogel <kfogel_at_newton.ch.collab.net>
Date: 2002-04-29 19:25:12 CEST

> So, let's say the user runs
> mycommit "foo; cp /bin/sh /tmp/; chmod 4777 /tmp/sh"

Invoking an $EDITOR by *any* means is the same as invoking arbitrary
programs (for example, if it's Emacs, then the user can just start up
a shell inside the editor, no need to get fancy). Bottom line: if you
can run `svn' as user jrandom, then you can run any program as user
jrandom. If someone has installed a setuid svn client binary, they
deserve what they get -- the safe thing to do is make sure only
jrandom can run svn as jrandom.

Remember, this isn't just about $EDITOR. It also holds when we
provide a mechanism for invoking a user-specified diff or merge
program; and inevitably there will be other circumstances where svn
invokes subprocesses. We need to put a warning in the documentation,
but otherwise let people shoot themselves in the foot if they choose.

So far, the security implications of system() don't seem any worse
than using APR/execl; system() is effectively as portable (it's ANSI
C, and the rest of the portability issues boil down to the argument
passed); and using system() will get us some expected behaviors that
we're not getting with APR.

+1 on using system(). I'm probably going to make this change unless
someone (Daniel?) beats me to it... :-)


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Received on Mon Apr 29 19:24:07 2002

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