Linux-kernel mailing list archive 1999-20,: Re: Capabilities done right [diff against 2.3.1]

# Re: Capabilities done right [diff against 2.3.1]

Ernst Jan Plugge (rmc@dds.nl)
Tue, 18 May 1999 10:04:50 +0200 (CEST)

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On Mon, 17 May 1999, Pavel Machek wrote:

> Yes, it is. Think about: (let ping be shell script)

[classic interpreter exploit snipped]

Wasn't this fixed for Linux a _long_ time ago?

Perl for example refuses to run a suid script unless it has been told at
compilation time that the OS has closed this hole. Red Hat's perl sure
doesn't complain when I run a suid perl script (not that I use them, of
course).

The usual fix, I believe, is to not pass the original filename as $1, but
a pipe that is connected to the original fd that was created when the
kernel opened the script to find out the interpreter's name.

Y.T.,

Ernst Jan Plugge - rmc@dds.nl

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