# Re: \[PATCH v5 07/27\] mm/mmap: Create a guard area between VMAs

- From: Florian Weimer \<hidden\>
- Date: 2018-10-12 10:24:52 
- List: linux-api
- Page: https://ratatoskr.run/linux-api/2018/10/5406311
- Thread: https://ratatoskr.run/linux-doc/2018/10/5406311/t.md

```text
* Dave Hansen:

> On 10/11/2018 08:15 AM, Yu-cheng Yu wrote:
>> Create a guard area between VMAs to detect memory corruption.
>
> This is a pretty major change that has a bunch of end-user implications.
>  It's not dependent on any debugging options and can't be turned on/off
> by individual apps, at runtime, or even at boot.
>
> Its connection to this series is also tenuous and not spelled out in the
> exceptionally terse changelog.

I agree.  We did have application failures due to the introduction of
the stack gap, so this change is likely to cause failures when applied
to existing mappings as well.
```