Re: [PATCH 2/2] mm/page_alloc.c: add config option to sanitize freed pages

From: Anisse Astier
Date: Mon Apr 27 2015 - 17:27:59 EST

On Mon, Apr 27, 2015 at 11:25 AM, PaX Team <pageexec@xxxxxxxxxxx> wrote:
> the PaX SANITIZE feature does exactly this in mm/page_alloc.c:prep_new_page:
> if (gfp_flags & __GFP_ZERO)
> prep_zero_page(page, order, gfp_flags);
> #endif

Thanks, I'll do that in the next iteration.

>> you'd need to clear memory on boot for example.
> it happens automagically because on boot during the transition from the
> boot allocator to the buddy one each page gets freed which will then go
> through the page clearing path.

Interesting, I'll see how it works.

> however there's a known problem/conflict with HIBERNATION (see
> which i think would
> have to be resolved before upstream acceptance.

I don't use hibernation, but I'll see if I can create a swap partition
to test that.


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