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

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Message-ID: <aWqIYkx-jrjbIXeS@wieczorr-mobl1.localdomain>
Date: Fri, 16 Jan 2026 18:53:28 +0000
From: Maciej Wieczor-Retman <m.wieczorretman@...me>
To: Andrey Ryabinin <ryabinin.a.a@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, Maciej Żenczykowski <maze@...gle.com>, Alexander Potapenko <glider@...gle.com>, Andrey Konovalov <andreyknvl@...il.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

Tested on a Sierra Forest server this time, still no issues both on generic and
sw_tags.

Tested-by: Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>

On 2026-01-16 at 14:28:22 +0100, Andrey Ryabinin 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
>
>

-- 
Kind regards
Maciej Wieczór-Retman