[Question] Should retain 2M alignment if kernel image is bad aligned at entry or BSS overlaps?

[Ard Biesheuvel]

On Thu, 3 Mar 2022 at 06:14, Kefeng Wang <wangkefeng.wang at huawei.com> wrote:
>
>
> On 2022/3/1 20:57, Ard Biesheuvel wrote:
> > On Tue, 1 Mar 2022 at 11:34, Kefeng Wang <wangkefeng.wang at huawei.com> wrote:
> >>
...
> >> Do you think the following adjustment make sense or it is definitely wrong?
> >>
> > I can only answer this if I understand which problem it solves. Why do
> > you need the 2M alignment in this case?
> > .
>
> Sorry for the late response，my purpose is that we don't want to enable
> KPTI if
>
> KASLR is disabled. For now, if there are some firmware bug, the kernel
> image is
>
> relocated which lead to kaslr_requires_kpti() returen
> ture(kaslr_offset() > 0).
>
> the change to 2M alignment is a workaround and according to your
> explanation,
>
> I don't think the workaround is necessary.  I want to make sure that the
> above
>
> scene is expected? thanks.
>

I don't think we need this.