Re: TASK_UNMAPPED_BASE & stack location

H. Peter Anvin
2003-04-25T20:50:00Z

Followup to: <459930000.1051302738@[10.10.2.4]>
By author: "Martin J. Bligh" <mbligh@aracnet.com>
In newsgroup: linux.dev.kernel
>
> Is there any good reason we can't remove TASK_UNMAPPED_BASE, and just shove
> libraries directly above the program text? Red Hat seems to have patches to
> dynamically tune it on a per-processes basis anyway ...
>
> Moreover, can we put the stack back where it's meant to be, below the
> program text, in that wasted 128MB of virtual space? Who really wants
> > 128MB of stack anyway (and can't fix their app)?
>

That space is NULL pointer trap zone. NULL pointer trapping -> good.

-hpa
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