lkml.org 
[lkml]   [2007]   [Jun]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH] Check files' signatures before doing suid/sgid [2/4]

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/

\
 
 \ /
  Last update: 2007-06-25 12:57    [W:0.054 / U:0.144 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site