# Re: \[PATCH\] mm: Remove HARDENED\_USERCOPY\_FALLBACK

- From: David Rientjes \<rientjes@google.com\>
- Date: 2021-09-26 20:49:40 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2021/09/1522109
- Thread: https://ratatoskr.run/linux-mm/2021/09/1516875/t.md

```text
On Tue, 21 Sep 2021, Stephen Kitt wrote:

> This has served its purpose and is no longer used. All usercopy
> violations appear to have been handled by now, any remaining
> instances (or new bugs) will cause copies to be rejected.
> 
> This isn't a direct revert of commit 2d891fbc3bb6 ("usercopy: Allow
> strict enforcement of whitelists"); since usercopy_fallback is
> effectively 0, the fallback handling is removed too.
> 
> This also removes the usercopy_fallback module parameter on
> slab_common.
> 
> Link: https://github.com/KSPP/linux/issues/153
> Signed-off-by: Stephen Kitt <redacted>
> Suggested-by: Kees Cook <redacted>

Acked-by: David Rientjes <rientjes@google.com>
```