Subject: Re: Importing PaX features to NetBSD
To: Elad Efrat <>
From: Matt Thomas <>
List: tech-security
Date: 12/18/2005 13:39:02
Elad Efrat wrote:
> Jason Thorpe wrote:
>>On Dec 18, 2005, at 4:03 AM, Martin Husemann wrote:
>>>The mprotect changes are arch dependend, and as gimpy pointed out  would
>>>violate ABI on some archs. I don't see how implementing them (which 
>>>be MD anyway) would cause any negative impact on other archs.
>>Yah, these would have to be implemented using new pmap hooks.
> Why wouuld these require pmap changes? they (should) be pure
> mmap/mprotect changes. Do you want to implement them in pmap because
> they are MD, or is there a technical need?

My proposal doesn't need pmap hooks.  However, VM placement does (see
PMAP_PREFER() for instance) for virtual caches.

Matt Thomas                     email:
3am Software Foundry              www:
Cupertino, CA              disclaimer: I avow all knowledge of this message.