Messages in this thread | | | From | Johannes Schlumberger <> | Date | Mon, 25 Jun 2007 12:54:35 +0200 | Subject | Re: [PATCH] Check files' signatures before doing suid/sgid [2/4] |
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Hi,
> >If a process uses read() it needs some executable and writable memory. We do > >check for this in mprotect(). There is a problem with the i386-architecture, > >because it allows execution of any readable page (except with newer > >processors). But beyond that ugliness of i386, it should not be possible to > >execute anything without us noticing it (hopefully). > > r and x together is not a problem IMHO.
It is, if you would want to have rw but can only get rwx. regards, Johannes
-- Johannes Schlumberger Department of Computer Science IV Martensstrasse 1 D-91058 Erlangen Germany University of Erlangen-Nuremberg http://wwwcip.informatik.uni-erlangen.de/~spjsschl - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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