Re: [PATCH] Check files' signatures before doing suid/sgid [2/4]

[Johannes Schlumberger]

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@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/