Messages in this thread | | | Date | Sat, 8 Dec 2007 10:50:19 +0000 | From | Pavel Machek <> | Subject | Re: Out of tree module using LSM |
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On Thu 2007-11-29 23:58:44, Andi Kleen wrote: > Alan Cox <alan@lxorguk.ukuu.org.uk> writes: > > > > The simple case is > > open > > write cathedral and bazaar in some order > > close > > <trap close -> process -> label eric_t> > > > > open (eric_t) - SELinux "no" > > > > > > Anyone smart will then write it out of order and keep the file open, or > > That would assume Eric already has a program running on your system > optimized to inject his works in a obfuscated way. And if he has a > program running he can do nearly everything already. You already > lost the game. > > The normal case Tvrtko et.al. are trying to handle would be more the > work getting downloaded from somewhere or read from a usb stick using > normal programs like web browsers or file managers who don't do any > out of order writing tricks and other obfuscation.
Fortunately normal programs tend to be dynamically linked, so LD_PRELOAD is fine to handle them. And we know we can't handle nasty programs. Seems like LD_PRELOAD is the way to go.
Pavel
-- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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