Re: [PATCH 0/2] mm/mremap: fix two issues with MREMAP_DONTUNMAP

[Andrew Morton]

On Sun, 20 Sep 2026 15:13:09 +0100 "Lorenzo Stoakes (ARM)" <ljs@xxxxxxxxxx> wrote:

> The MREMAP_DONTUNMAP feature is highly unusual in that it permits mremap()
> operations that keep the original VMA in place.
> 
> Historically this has led to a lot of bugs where non-obvious interactions
> occur between existing mremap() operations and the original VMA.
> 
> ...
> 
> Both issues can be fixed by treating the source range as distinct from the
> destination range, which is the definition of what MREMAP_DONTUNMAP does so
> is appropriate.

Can we please have some review of these two cc:stable hotfixes?

Thanks.