Re: OS stopping stack buffer overflow exploits

From: Matthew Dharm (mdharm-kernel@one-eyed-alien.net)
Date: Sat Jun 03 2000 - 21:48:17 EST

On Sat, Jun 03, 2000 at 09:06:46PM -0500, Robert Redelmeier wrote:
> 2) On syscall entry, the kernel could check the page tables
> to be sure that the return address is from code pages (read-only),
> and not from data pages (read-write). The kernel would log and
> terminate any such process. Kill some nasty bugs this way too.
> This assumes an exploit can do limited damage without syscalls.

Hrm... this could cause some problems for applications which use
self-modifying code (i.e. trampoline handlers, etc.)

Matt 

-- 
Matthew Dharm                              Home: mdharm@one-eyed-alien.net 
Senior Engineer, QCP Inc.                            Work: mdharm@qcpi.com

We can customize our colonels.
					-- Tux
User Friendly, 12/1/1998

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/

This archive was generated by hypermail 2b29 : Wed Jun 07 2000 - 21:00:18 EST