linux-kernel - Re: [PATCH 24/31] kasan, vmalloc, arm64: mark vmalloc mappings as pgprot

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Message-ID: <YaoQos9Fevz32h6+@elver.google.com>
Date:   Fri, 3 Dec 2021 13:42:10 +0100
From:   Marco Elver <elver@...gle.com>
To:     andrey.konovalov@...ux.dev
Cc:     Alexander Potapenko <glider@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Peter Collingbourne <pcc@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>, kasan-dev@...glegroups.com,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Evgenii Stepanov <eugenis@...gle.com>,
        linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: Re: [PATCH 24/31] kasan, vmalloc, arm64: mark vmalloc mappings as
 pgprot_tagged

On Tue, Nov 30, 2021 at 11:07PM +0100, andrey.konovalov@...ux.dev wrote:
> From: Andrey Konovalov <andreyknvl@...gle.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.
> 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@...gle.com>
> Co-developed-by: Vincenzo Frascino <vincenzo.frascino@....com>

This is also missing Signed-off-by from Vincenzo.