Re: [PATCH v5] RO/NX protection for loadable kernel modules

[Rusty Russell]

On Sun, 12 Jul 2009 05:15:24 pm Arjan van de Ven wrote:
> Rusty Russell <rusty@xxxxxxxxxxxxxxx> wrote:
> > (I like the idea of trying kmalloc and falling back, simply because
> > it reduces TLB pressure, but that's probably best done after
> > unification).
>
> or using a non-power-of-two get_free_pages() thing...
>
> some architectures will need to know that memory needs to be executable
> at allocation time so that it can be put in an executable address range
> etc...

Yes, maybe that's better than kmalloc.  On my laptop I have 105 modules 
loaded, with 3778464 total length: I'm wasting 206944 bytes on unused tails of 
pages.  But that's only 0.06% of my memory.

Thanks,
Rusty.
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