# \[PATCH 3/6\] struct page: add field for vm\_struct

- From: Igor Stoppa \<hidden\>
- Date: 2018-02-21 12:01:20 
- List: linux-security-module
- Page: https://ratatoskr.run/linux-security-module/2018/02/5197197
- Thread: https://ratatoskr.run/linux-security-module/2018/02/5197191/t.md

```text


On 20/02/18 22:54, Matthew Wilcox wrote:
> On Tue, Feb 20, 2018 at 09:53:30PM +0200, Igor Stoppa wrote:

[...]

>> It was found while testing on a configuration with framebuffer.
> 
> ... ah.  You tried to use vmalloc_to_page() on something which wasn't
> backed by a struct page.  That's *supposed* to return NULL, but my
> guess is that after this patch it returned garbage.

it seems to return garbage also without this patch, but I need to clean
up the code, try it again and possibly come up with a demo patch for
triggering the problem.

I'll investigate it more. However it doesn't seem to be related to the
functionality I need. So I plan to treat it as separate issue and leave
find_vm_area untouched, at least in pmalloc scope.

--
igor



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