| 1 |
On 3/27/06, Hemmann, Volker Armin <volker.armin.hemmann@××××××××××××.de> wrote: |
| 2 |
> On Monday 27 March 2006 07:57, Richard Fish wrote: |
| 3 |
> > On 3/26/06, Walter Dnes <waltdnes@××××××××.org> wrote: |
| 4 |
> > > The subject says it all. I've done some spelunking through |
| 5 |
> > > /usr/src/linux/.config, and I don't see anything relavant. |
| 6 |
> > |
| 7 |
> > It's enabled by default. If you don't want it, you need to boot with |
| 8 |
> > the "noexec=off" kernel option. |
| 9 |
> > |
| 10 |
> |
| 11 |
> on AMD64, but x86 doesn't have the NX bit, so a hardened kernel might be the |
| 12 |
> best solution. |
| 13 |
|
| 14 |
No, current intel processors support the NX bit also: |
| 15 |
|
| 16 |
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge |
| 17 |
mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx pni |
| 18 |
monitor vmx est tm2 xtpr |
| 19 |
|
| 20 |
And if you look at the noexec_setup function in arch/i386/mm/init.c, |
| 21 |
you will see that it does not require AMD64. |
| 22 |
|
| 23 |
But I agree that PAE is the necessary option if your processor is too |
| 24 |
old and does not support the NX bit. Sorry I did not mention that. |
| 25 |
|
| 26 |
-Richard |
| 27 |
|
| 28 |
-- |
| 29 |
gentoo-user@g.o mailing list |
Archives