linux-kernel - Re: [PATCH mm v4 16/39] kasan: define KASAN_VMALLOC_INVALID for SW

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Message-ID: <CAG_fn=W_6j08zxpgWeCX_uxN+Jqi93XYtQ_GY-Gjs_Ru2Hb2aQ@mail.gmail.com>
Date:   Tue, 21 Dec 2021 10:23:02 +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 16/39] kasan: define KASAN_VMALLOC_INVALID for SW_TAGS

On Mon, Dec 20, 2021 at 11:00 PM <andrey.konovalov@...ux.dev> wrote:
>
> From: Andrey Konovalov <andreyknvl@...gle.com>
>
> In preparation for adding vmalloc support to SW_TAGS KASAN,
> provide a KASAN_VMALLOC_INVALID definition for it.
>
> HW_TAGS KASAN won't be using this value, as it falls back onto
> page_alloc for poisoning freed vmalloc() memory.
>
> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
Reviewed-by: Alexander Potapenko <glider@...gle.com>