linux-kernel - Re: [PATCH] mm-kasan-kunit-extend-vmalloc-oob-tests-to-cover-vrealloc-fix

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Message-ID: <CA+fCnZed4zuPgoacXgEKYjPJ-r5JkZTFcgFFysFLngMLkrhfKQ@mail.gmail.com>
Date: Sat, 17 Jan 2026 02:16:39 +0100
From: Andrey Konovalov <andreyknvl@...il.com>
To: Andrey Ryabinin <ryabinin.a.a@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, Maciej Żenczykowski <maze@...gle.com>, 
	Maciej Wieczor-Retman <m.wieczorretman@...me>, Alexander Potapenko <glider@...gle.com>, 
	Dmitry Vyukov <dvyukov@...gle.com>, Vincenzo Frascino <vincenzo.frascino@....com>, 
	kasan-dev@...glegroups.com, Uladzislau Rezki <urezki@...il.com>, linux-kernel@...r.kernel.org, 
	linux-mm@...ck.org
Subject: Re: [PATCH] mm-kasan-kunit-extend-vmalloc-oob-tests-to-cover-vrealloc-fix

On Fri, Jan 16, 2026 at 2:29 PM Andrey Ryabinin <ryabinin.a.a@...il.com> wrote:
>
> Adjust vrealloc() size to verify full-granule poisoning/unpoisoning
> in tag-based modes.
>
> Signed-off-by: Andrey Ryabinin <ryabinin.a.a@...il.com>
> Cc: Andrey Konovalov <andreyknvl@...il.com>
> ---
>  mm/kasan/kasan_test_c.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/mm/kasan/kasan_test_c.c b/mm/kasan/kasan_test_c.c
> index cc8fc479e13a..b4d157962121 100644
> --- a/mm/kasan/kasan_test_c.c
> +++ b/mm/kasan/kasan_test_c.c
> @@ -1881,7 +1881,7 @@ static void vmalloc_oob(struct kunit *test)
>
>         vmalloc_oob_helper(test, v_ptr, size);
>
> -       size--;
> +       size -= KASAN_GRANULE_SIZE + 1;
>         v_ptr = vrealloc(v_ptr, size, GFP_KERNEL);
>         KUNIT_ASSERT_NOT_ERR_OR_NULL(test, v_ptr);
>
> @@ -1889,7 +1889,7 @@ static void vmalloc_oob(struct kunit *test)
>
>         vmalloc_oob_helper(test, v_ptr, size);
>
> -       size += 2;
> +       size += 2 * KASAN_GRANULE_SIZE + 2;
>         v_ptr = vrealloc(v_ptr, size, GFP_KERNEL);
>         KUNIT_ASSERT_NOT_ERR_OR_NULL(test, v_ptr);
>
> --
> 2.52.0
>

Reviewed-by: Andrey Konovalov <andreyknvl@...il.com>