mailing list archives
Re: Buffer overflow prevention
From: Mariusz Woloszyn <emsi () ipartners pl>
Date: Mon, 18 Aug 2003 20:01:51 +0200 (EEST)
On Mon, 18 Aug 2003 pageexec () freemail hu wrote:
Anyways, on an i386 you can do W^X somewhat. Not as perfectly as you
can on cpus that have a per-page X bit...
You are wrong again, PaX provides perfect per-page non-executable pages
using segmentation (SEGMEXEC), there are no restrictions on the ordering
of data/code pages like in OpenBSD.
BTW: have anyone tried to talk wih Linus about implementing some PaX (or
even GR) functionality in official Kernels?
I know that the argument for not implementing Solar Designer's
nonexecutable stack patch in official kernel was that it is easily
bypassable, so what about PaX???
I hate seeing GOT and other segments rwx nowdays (while it's marked as r-x
it IS executable).
Internet Security Specialist, GTS - Internet Partners
- Re: Buffer overflow prevention, (continued)