[PATCH v4 22/26] arm64: mm: move ro_after_init section into the data segment

[Ard Biesheuvel]

On Mon, 13 Jun 2022 at 19:00, Kees Cook <keescook at chromium.org> wrote:
>
> On Mon, Jun 13, 2022 at 04:45:46PM +0200, Ard Biesheuvel wrote:
> > Currently, the ro_after_init sections sits right in the middle of the
> > text/rodata/inittext segment, making it difficult to map any of those
> > non-writable during early boot. So instead, move it to the start of
> > .data, and update the init sequences so that the section is remapped
> > read-only once startup completes.
> >
> > Note that this moves the entire HYP data section into .data as well -
> > this likely needs to remain as a single block for now, but could perhaps
> > split into a .rodata and .data..ro_after_init section later.
>
> If I'm reading this correctly, this means that .data..ro_after_init now
> lives between .data and .rodata?
>

No, between .initdata and .data

> Do the various LKDTM tests still pass after this change?
>

Good question, I'll check.

> Reviewed-by: Kees Cook <keescook at chromium.org>
>
> --
> Kees Cook