linux-kernel - Re: fanotify as syscalls

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Message-ID: <20090922162707.GA11608@shareable.org>
Date:	Tue, 22 Sep 2009 17:27:07 +0100
From:	Jamie Lokier <jamie@...reable.org>
To:	Eric Paris <eparis@...hat.com>
Cc:	Andreas Gruenbacher <agruen@...e.de>,
	Davide Libenzi <davidel@...ilserver.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Evgeniy Polyakov <zbr@...emap.net>,
	David Miller <davem@...emloft.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org, netdev@...r.kernel.org,
	viro@...iv.linux.org.uk, alan@...ux.intel.com, hch@...radead.org
Subject: Re: fanotify as syscalls

Eric Paris wrote:
> That's not the fatal flaw.  The fatal flaw is that I am not going to
> write 90% of a rootkit and make it easy to use.

I hate to point out the obvious, but fanotify's ability to intercept
every file access and rewrite the file before the access proceeds is
also 90% of a rootkit...

But fortunately both fanotify and syscall rewriting require root in
the first place.

I think that makes the rootkit argument moot.  As long as fanotify
doesn't have a non-root flavour... which really would be handy for
rootkits :-)

> Easy != Good.

I agree.

-- Jamie
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