linux-kernel - Re: [PATCH 0/8] kasan: test: avoid crashing the kernel with HW

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Date:   Thu, 12 Aug 2021 10:58:46 +0200
From:   Marco Elver <elver@...gle.com>
To:     andrey.konovalov@...ux.dev
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        kasan-dev@...glegroups.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/8] kasan: test: avoid crashing the kernel with HW_TAGS

On Wed, 11 Aug 2021 at 21:21, <andrey.konovalov@...ux.dev> wrote:
>
> From: Andrey Konovalov <andreyknvl@...il.com>
>
> KASAN tests do out-of-bounds and use-after-free accesses. Running the
> tests works fine for the GENERIC mode, as it uses qurantine and redzones.
> But the HW_TAGS mode uses neither, and running the tests might crash
> the kernel.
>
> Rework the tests to avoid corrupting kernel memory.

Thanks for this!

I think only 1 change is questionable ("kasan: test: avoid corrupting
memory via memset") because it no longer checks overlapping valid to
invalid range writes.

> Andrey Konovalov (8):
>   kasan: test: rework kmalloc_oob_right
>   kasan: test: avoid writing invalid memory
>   kasan: test: avoid corrupting memory via memset
>   kasan: test: disable kmalloc_memmove_invalid_size for HW_TAGS
>   kasan: test: only do kmalloc_uaf_memset for generic mode
>   kasan: test: clean up ksize_uaf
>   kasan: test: avoid corrupting memory in copy_user_test
>   kasan: test: avoid corrupting memory in kasan_rcu_uaf
>
>  lib/test_kasan.c        | 74 ++++++++++++++++++++++++++++-------------
>  lib/test_kasan_module.c | 20 +++++------
>  2 files changed, 60 insertions(+), 34 deletions(-)
>
> --
> 2.25.1
>