[PATCH v2 24/34] kasan, vmalloc, arm64: mark vmalloc mappings as pgprot_tagged

[Andrey Konovalov]

On Mon, Dec 13, 2021 at 4:17 PM Vincenzo Frascino
<vincenzo.frascino at arm.com> wrote:
>
> Hi Andrey,
>
> On 12/6/21 9:44 PM, andrey.konovalov at linux.dev wrote:
> > From: Andrey Konovalov <andreyknvl at google.com>
> >
> > HW_TAGS KASAN relies on ARM Memory Tagging Extension (MTE). With MTE,
> > a memory region must be mapped as MT_NORMAL_TAGGED to allow setting
> > memory tags via MTE-specific instructions.
> >
> > This change adds proper protection bits to vmalloc() allocations.
>
> Please avoid "this patch/this change" in patch description and use imperative
> mode as if you are giving a command to the code base ([1] paragraph 2).

Hi Vincenzo,

Done in v3.

> > These allocations are always backed by page_alloc pages, so the tags
> > will actually be getting set on the corresponding physical memory.
> >
> > Signed-off-by: Andrey Konovalov <andreyknvl at google.com>
> > Co-developed-by: Vincenzo Frascino <vincenzo.frascino at arm.com>
>
> With the change to the commit message:
>
> Signed-off-by: Vincenzo Frascino <vincenzo.frascino at arm.com>

Thanks!