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Re: Dangerous: delete-file deletes current directory as root!!
From: |
Francesco Potorti` |
Subject: |
Re: Dangerous: delete-file deletes current directory as root!! |
Date: |
Sun, 13 Oct 2002 19:20:38 +0200 |
> > > Now, I'm not sure what `delete-file' should do. Should it mimic `unlink'
> > > or should it first check that it is not called on a directory ?
> > Definitely the second one.
>
> Do you mean it for all cases, or only for interactive use ?
I mean for all cases. If we ever want to provide unlink(2) complete
functionality from inside Emacs (which I am not sure it is wise), we
should use a different function for that purpose.
> You say "I really mean it" but obviously you're not aware of the dangers
> since you think it's no more dangerous than running a shell. You don't
> realize the amount of code Emacs uses for the simplest operations
> and how many hooks and tricks it provides, all of them designed for
> the user's convenience but with very little thought given to the
> security implications ot to the case when the user is root (and
> can thus do things that would normally fail, as in your case).
I agree with what you say (also in the following, that I cut), but my
conclusions are different, based on experience. For many years I have
run Emacs as root in a dedicated text console and in a dedicated X
frame, as I often do system management. While I do not do almost
anything as root that I could do as a normal user, I happen to use Emacs
as root daily on GNU/Linux, and this is the first time I have used it on
Sun. The only difference between the two environments should be the
kernel and library.
In practice, I found that Emacs on GNU/Linux protects me better than the
shell does, when I am acting as root.