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

- From: Matthew Wilcox \<willy@infradead.org\>
- Date: 2018-02-20 20:54:42 
- List: linux-security-module
- Page: https://ratatoskr.run/linux-security-module/2018/02/5197196
- Thread: https://ratatoskr.run/linux-security-module/2018/02/5197191/t.md

```text
On Tue, Feb 20, 2018 at 09:53:30PM +0200, Igor Stoppa wrote:
> The patch relies on the function vmalloc_to_page ... which will return
> NULL when applied to huge mappings, while the original implementation
> will still work.

Huh?  vmalloc_to_page() should work for huge mappings...

> 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.

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