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

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Message-ID: <20260116132822.22227-1-ryabinin.a.a@gmail.com>
Date: Fri, 16 Jan 2026 14:28:22 +0100
From: Andrey Ryabinin <ryabinin.a.a@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Maciej Żenczykowski <maze@...gle.com>,
	Maciej Wieczor-Retman <m.wieczorretman@...me>,
	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,
	Andrey Ryabinin <ryabinin.a.a@...il.com>
Subject: [PATCH] mm-kasan-kunit-extend-vmalloc-oob-tests-to-cover-vrealloc-fix

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