lkml.org 
[lkml]   [2005]   [May]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] prevent NULL mmap in topdown model
From
Date
Arjan van de Ven <arjan@infradead.org> writes:

> On Wed, 2005-05-18 at 23:46 -0700, Chris Wright wrote:
>
> sure. Making it *impossible* to mmap that page is bad. People should be
> able to do that if they really want to, just doing it if they don't ask
> for it is bad.
>
> There are plenty of reasons people may want that page mmaped, one of
> them being that the compiler can then do more speculative loads around
> null pointer checks. Not saying it's a brilliant idea always, but making
> such things impossible makes no sense.

More realistically, iirc either Wine or dosemu, i forget which, actually has
to map page 0 to work properly.

--
greg

-
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: 2005-05-29 23:22    [W:0.089 / U:0.268 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site