# Re: \[PATCH v4\] ARM: Implement SLS mitigation

- From: Linus Walleij \<hidden\>
- Date: 2021-03-03 18:43:07 
- List: linux-security-module
- Page: https://ratatoskr.run/linux-security-module/2021/03/6287035
- Thread: https://ratatoskr.run/linux-arm-kernel/2021/02/6268187/t.md

```text
On Wed, Mar 3, 2021 at 4:29 PM David Laight [ref] wrote:
> > On Tue, Feb 23, 2021 at 11:05 AM Will Deacon [ref] wrote:

> > I wrote some suggestions on follow-ups in my reply, and I can
> > help out doing some of the patches, I think.
> >
> > Since ARM32 RET is mov pc, <>
> > git grep 'mov.*pc,' | wc -l gives 93 sites in arch/arm.
> > I suppose these need to come out:
> >
> > mov pc, lr
> > dsb(nsh);
> > isb();
>
> Won't that go horribly wrong for conditional returns?

It will so I would not insert it after those. It has to be
on a case-by-base basis, I am not planning any
search and replace operations.

Yours,
Linus Walleij
```