[mini anonsik] kernel: exec-shield + NX.

[Paweł Sikora]

On Friday 04 of June 2004 12:51, Jan Rekorajski wrote:
> On Fri, 04 Jun 2004, Paweł Sikora wrote:
> > testuje to juz drugi dzien i nie zauwazylem by sytem pochlonal
> > mi jakos wiecej pamieci (mam tylko 256MB ramu).
> > nie zauwazylem tez by cos dzialalo wolniej (np. kde).
>
> Dziekuje. Tyle mi wystarczy ;)
> Tak przy okazji to wlasnie poczytalem sobie o tym paczu i go przejrzalem
> i tam nic nie ma na temat koniecznosci wlaczania HIGHMEM_64GB.
> Czy cos przeoczylem?

tak:)
[ http://lkml.org/lkml/2004/6/2/233 ]

(...)
if the CPU supports NX (and the kernel has been compiled with
CONFIG_HIGHMEM64G) then exec-shield will use NX to provide page-level
finegrained control over execution. On legacy CPUs that dont support NX
the segment-limit method is used to control execution (in a coarser
way). In the NX case the segment-limit is turned off altogether.
(...)

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