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

* Dave Hansen:

On 10/11/2018 08:15 AM, Yu-cheng Yu wrote:

quoted

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.