[PATCH 1/2] ARM: ioremap: Flush PGDs for VMALLOC shadow

[Linus Walleij]

On Wed, Oct 16, 2024 at 8:50 PM Ard Biesheuvel <ardb at kernel.org> wrote:

> Yes, so we rely on the fact that changes to the vmalloc area and
> changes to the associated shadow mappings always occur in combination,
> right?

Yes otherwise it is pretty much the definition of a KASAN violation.

Mostly it "just works" because all low-level operations emitted by the
compiler and all memcpy() (etc) are patched to do any memory access
in tandem, this vmalloc_seq-thing was a big confusion for me.

I'll send out the revised patches so people can test!

Yours,
Linus Walleij