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


> >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.

Johannes Schlumberger Department of Computer Science IV
Martensstrasse 1 D-91058 Erlangen Germany University of Erlangen-Nuremberg
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2007-06-25 12:57    [W:0.103 / U:9.788 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site