Re: rm-ing files with open file descriptors

From: Pavel Machek (pavel@suse.cz)
Date: Wed Jan 23 2002 - 07:18:19 EST

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Hi!

> >> This could be hacked around ofcourse in fs/namei.c, so I tried
> >> it for fun. And indeed, with a minor correction it works:
> >>
> >> % perl flink.pl
> >> Success.
> >>
> >> I now have a flink-test2.txt file. That is pretty cool ;)
> >
> >It's also a security hole.
>
> How is linking back a file into the normal namespace anymore
> a security hole as having it under /proc or keeping an fd to it
> open?

Imagine you want to delete my file, you are root.

Before, you could rm it, then kill all my processes.
Pavel

-- 
(about SSSCA) "I don't say this lightly.  However, I really think that the U.S.
no longer is classifiable as a democracy, but rather as a plutocracy." --hpa
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Next message: Pavel Machek: "swsusp for 2.4.17"
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