linux-kernel - Re: [PATCH mm v4 26/39] kasan, vmalloc: unpoison VM

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Date:   Tue, 21 Dec 2021 12:50:17 +0100
From:   Alexander Potapenko <glider@...gle.com>
To:     andrey.konovalov@...ux.dev
Cc:     Marco Elver <elver@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Peter Collingbourne <pcc@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: Re: [PATCH mm v4 26/39] kasan, vmalloc: unpoison VM_ALLOC pages after mapping

On Mon, Dec 20, 2021 at 11:02 PM <andrey.konovalov@...ux.dev> wrote:
>
> From: Andrey Konovalov <andreyknvl@...gle.com>
>
> Make KASAN unpoison vmalloc mappings after they have been mapped in
> when it's possible: for vmalloc() (indentified via VM_ALLOC) and
> vm_map_ram().
>
> The reasons for this are:
>
> - For vmalloc() and vm_map_ram(): pages don't get unpoisoned in case
>   mapping them fails.
> - For vmalloc(): HW_TAGS KASAN needs pages to be mapped to set tags via
>   kasan_unpoison_vmalloc().
>
> As a part of these changes, the return value of __vmalloc_node_range()
> is changed to area->addr. This is a non-functional change, as
> __vmalloc_area_node() returns area->addr anyway.
>
> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
Reviewed-by: Alexander Potapenko <glider@...gle.com>