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From:   andrey.konovalov@linux.dev
To:     Marco Elver <elver@google.com>,
        Alexander Potapenko <glider@google.com>
Cc:     Andrey Konovalov <andreyknvl@gmail.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        Andrey Ryabinin <ryabinin.a.a@gmail.com>,
        kasan-dev@googlegroups.com, Evgenii Stepanov <eugenis@google.com>,
        Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org,
        Andrey Konovalov <andreyknvl@google.com>
Subject: [PATCH RFC 17/20] kasan: reorder tests
Date:   Mon,  6 Nov 2023 21:10:26 +0100
Message-Id: <f691b51115e34dd867707bebb5522cce161b46eb.1699297309.git.andreyknvl@google.com>
In-Reply-To: <cover.1699297309.git.andreyknvl@google.com>
References: <cover.1699297309.git.andreyknvl@google.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

From: Andrey Konovalov <andreyknvl@google.com>

Put closely related tests next to each other.

No functional changes.

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
---
 mm/kasan/kasan_test.c | 418 +++++++++++++++++++++---------------------
 1 file changed, 209 insertions(+), 209 deletions(-)

diff --git a/mm/kasan/kasan_test.c b/mm/kasan/kasan_test.c
index 4ea403653a39..9a1bdd6ca8c4 100644
--- a/mm/kasan/kasan_test.c
+++ b/mm/kasan/kasan_test.c
@@ -213,6 +213,23 @@ static void kmalloc_node_oob_right(struct kunit *test)
 	kfree(ptr);
 }
 
+/*
+ * Check that KASAN detects an out-of-bounds access for a big object allocated
+ * via kmalloc(). But not as big as to trigger the page_alloc fallback for SLUB.
+ */
+static void kmalloc_big_oob_right(struct kunit *test)
+{
+	char *ptr;
+	size_t size = KMALLOC_MAX_CACHE_SIZE - 256;
+
+	ptr = kmalloc(size, GFP_KERNEL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
+
+	OPTIMIZER_HIDE_VAR(ptr);
+	KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 0);
+	kfree(ptr);
+}
+
 /*
  * The kmalloc_large_* tests below use kmalloc() to allocate a memory chunk
  * that does not fit into the largest slab cache and therefore is allocated via
@@ -299,23 +316,6 @@ static void page_alloc_uaf(struct kunit *test)
 	KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[0]);
 }
 
-/*
- * Check that KASAN detects an out-of-bounds access for a big object allocated
- * via kmalloc(). But not as big as to trigger the page_alloc fallback for SLUB.
- */
-static void kmalloc_big_oob_right(struct kunit *test)
-{
-	char *ptr;
-	size_t size = KMALLOC_MAX_CACHE_SIZE - 256;
-
-	ptr = kmalloc(size, GFP_KERNEL);
-	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
-
-	OPTIMIZER_HIDE_VAR(ptr);
-	KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 0);
-	kfree(ptr);
-}
-
 static void krealloc_more_oob_helper(struct kunit *test,
 					size_t size1, size_t size2)
 {
@@ -698,6 +698,126 @@ static void kmalloc_uaf3(struct kunit *test)
 	KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr1)[8]);
 }
 
+static void kmalloc_double_kzfree(struct kunit *test)
+{
+	char *ptr;
+	size_t size = 16;
+
+	ptr = kmalloc(size, GFP_KERNEL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
+
+	kfree_sensitive(ptr);
+	KUNIT_EXPECT_KASAN_FAIL(test, kfree_sensitive(ptr));
+}
+
+/* Check that ksize() does NOT unpoison whole object. */
+static void ksize_unpoisons_memory(struct kunit *test)
+{
+	char *ptr;
+	size_t size = 128 - KASAN_GRANULE_SIZE - 5;
+	size_t real_size;
+
+	ptr = kmalloc(size, GFP_KERNEL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
+
+	real_size = ksize(ptr);
+	KUNIT_EXPECT_GT(test, real_size, size);
+
+	OPTIMIZER_HIDE_VAR(ptr);
+
+	/* These accesses shouldn't trigger a KASAN report. */
+	ptr[0] = 'x';
+	ptr[size - 1] = 'x';
+
+	/* These must trigger a KASAN report. */
+	if (IS_ENABLED(CONFIG_KASAN_GENERIC))
+		KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[size]);
+	KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[size + 5]);
+	KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[real_size - 1]);
+
+	kfree(ptr);
+}
+
+/*
+ * Check that a use-after-free is detected by ksize() and via normal accesses
+ * after it.
+ */
+static void ksize_uaf(struct kunit *test)
+{
+	char *ptr;
+	int size = 128 - KASAN_GRANULE_SIZE;
+
+	ptr = kmalloc(size, GFP_KERNEL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
+	kfree(ptr);
+
+	OPTIMIZER_HIDE_VAR(ptr);
+	KUNIT_EXPECT_KASAN_FAIL(test, ksize(ptr));
+	KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[0]);
+	KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[size]);
+}
+
+/*
+ * The two tests below check that Generic KASAN prints auxiliary stack traces
+ * for RCU callbacks and workqueues. The reports need to be inspected manually.
+ *
+ * These tests are still enabled for other KASAN modes to make sure that all
+ * modes report bad accesses in tested scenarios.
+ */
+
+static struct kasan_rcu_info {
+	int i;
+	struct rcu_head rcu;
+} *global_rcu_ptr;
+
+static void rcu_uaf_reclaim(struct rcu_head *rp)
+{
+	struct kasan_rcu_info *fp =
+		container_of(rp, struct kasan_rcu_info, rcu);
+
+	kfree(fp);
+	((volatile struct kasan_rcu_info *)fp)->i;
+}
+
+static void rcu_uaf(struct kunit *test)
+{
+	struct kasan_rcu_info *ptr;
+
+	ptr = kmalloc(sizeof(struct kasan_rcu_info), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
+
+	global_rcu_ptr = rcu_dereference_protected(
+				(struct kasan_rcu_info __rcu *)ptr, NULL);
+
+	KUNIT_EXPECT_KASAN_FAIL(test,
+		call_rcu(&global_rcu_ptr->rcu, rcu_uaf_reclaim);
+		rcu_barrier());
+}
+
+static void workqueue_uaf_work(struct work_struct *work)
+{
+	kfree(work);
+}
+
+static void workqueue_uaf(struct kunit *test)
+{
+	struct workqueue_struct *workqueue;
+	struct work_struct *work;
+
+	workqueue = create_workqueue("kasan_workqueue_test");
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, workqueue);
+
+	work = kmalloc(sizeof(struct work_struct), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, work);
+
+	INIT_WORK(work, workqueue_uaf_work);
+	queue_work(workqueue, work);
+	destroy_workqueue(workqueue);
+
+	KUNIT_EXPECT_KASAN_FAIL(test,
+		((volatile struct work_struct *)work)->data);
+}
+
 static void kfree_via_page(struct kunit *test)
 {
 	char *ptr;
@@ -748,6 +868,69 @@ static void kmem_cache_oob(struct kunit *test)
 	kmem_cache_destroy(cache);
 }
 
+static void kmem_cache_double_free(struct kunit *test)
+{
+	char *p;
+	size_t size = 200;
+	struct kmem_cache *cache;
+
+	cache = kmem_cache_create("test_cache", size, 0, 0, NULL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
+
+	p = kmem_cache_alloc(cache, GFP_KERNEL);
+	if (!p) {
+		kunit_err(test, "Allocation failed: %s\n", __func__);
+		kmem_cache_destroy(cache);
+		return;
+	}
+
+	kmem_cache_free(cache, p);
+	KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_free(cache, p));
+	kmem_cache_destroy(cache);
+}
+
+static void kmem_cache_invalid_free(struct kunit *test)
+{
+	char *p;
+	size_t size = 200;
+	struct kmem_cache *cache;
+
+	cache = kmem_cache_create("test_cache", size, 0, SLAB_TYPESAFE_BY_RCU,
+				  NULL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
+
+	p = kmem_cache_alloc(cache, GFP_KERNEL);
+	if (!p) {
+		kunit_err(test, "Allocation failed: %s\n", __func__);
+		kmem_cache_destroy(cache);
+		return;
+	}
+
+	/* Trigger invalid free, the object doesn't get freed. */
+	KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_free(cache, p + 1));
+
+	/*
+	 * Properly free the object to prevent the "Objects remaining in
+	 * test_cache on __kmem_cache_shutdown" BUG failure.
+	 */
+	kmem_cache_free(cache, p);
+
+	kmem_cache_destroy(cache);
+}
+
+static void empty_cache_ctor(void *object) { }
+
+static void kmem_cache_double_destroy(struct kunit *test)
+{
+	struct kmem_cache *cache;
+
+	/* Provide a constructor to prevent cache merging. */
+	cache = kmem_cache_create("test_cache", 200, 0, 0, empty_cache_ctor);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
+	kmem_cache_destroy(cache);
+	KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_destroy(cache));
+}
+
 static void kmem_cache_accounted(struct kunit *test)
 {
 	int i;
@@ -1151,53 +1334,6 @@ static void kasan_global_oob_left(struct kunit *test)
 	KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p);
 }
 
-/* Check that ksize() does NOT unpoison whole object. */
-static void ksize_unpoisons_memory(struct kunit *test)
-{
-	char *ptr;
-	size_t size = 128 - KASAN_GRANULE_SIZE - 5;
-	size_t real_size;
-
-	ptr = kmalloc(size, GFP_KERNEL);
-	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
-
-	real_size = ksize(ptr);
-	KUNIT_EXPECT_GT(test, real_size, size);
-
-	OPTIMIZER_HIDE_VAR(ptr);
-
-	/* These accesses shouldn't trigger a KASAN report. */
-	ptr[0] = 'x';
-	ptr[size - 1] = 'x';
-
-	/* These must trigger a KASAN report. */
-	if (IS_ENABLED(CONFIG_KASAN_GENERIC))
-		KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[size]);
-	KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[size + 5]);
-	KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[real_size - 1]);
-
-	kfree(ptr);
-}
-
-/*
- * Check that a use-after-free is detected by ksize() and via normal accesses
- * after it.
- */
-static void ksize_uaf(struct kunit *test)
-{
-	char *ptr;
-	int size = 128 - KASAN_GRANULE_SIZE;
-
-	ptr = kmalloc(size, GFP_KERNEL);
-	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
-	kfree(ptr);
-
-	OPTIMIZER_HIDE_VAR(ptr);
-	KUNIT_EXPECT_KASAN_FAIL(test, ksize(ptr));
-	KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[0]);
-	KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[size]);
-}
-
 static void kasan_stack_oob(struct kunit *test)
 {
 	char stack_array[10];
@@ -1240,69 +1376,6 @@ static void kasan_alloca_oob_right(struct kunit *test)
 	KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p);
 }
 
-static void kmem_cache_double_free(struct kunit *test)
-{
-	char *p;
-	size_t size = 200;
-	struct kmem_cache *cache;
-
-	cache = kmem_cache_create("test_cache", size, 0, 0, NULL);
-	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
-
-	p = kmem_cache_alloc(cache, GFP_KERNEL);
-	if (!p) {
-		kunit_err(test, "Allocation failed: %s\n", __func__);
-		kmem_cache_destroy(cache);
-		return;
-	}
-
-	kmem_cache_free(cache, p);
-	KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_free(cache, p));
-	kmem_cache_destroy(cache);
-}
-
-static void kmem_cache_invalid_free(struct kunit *test)
-{
-	char *p;
-	size_t size = 200;
-	struct kmem_cache *cache;
-
-	cache = kmem_cache_create("test_cache", size, 0, SLAB_TYPESAFE_BY_RCU,
-				  NULL);
-	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
-
-	p = kmem_cache_alloc(cache, GFP_KERNEL);
-	if (!p) {
-		kunit_err(test, "Allocation failed: %s\n", __func__);
-		kmem_cache_destroy(cache);
-		return;
-	}
-
-	/* Trigger invalid free, the object doesn't get freed. */
-	KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_free(cache, p + 1));
-
-	/*
-	 * Properly free the object to prevent the "Objects remaining in
-	 * test_cache on __kmem_cache_shutdown" BUG failure.
-	 */
-	kmem_cache_free(cache, p);
-
-	kmem_cache_destroy(cache);
-}
-
-static void empty_cache_ctor(void *object) { }
-
-static void kmem_cache_double_destroy(struct kunit *test)
-{
-	struct kmem_cache *cache;
-
-	/* Provide a constructor to prevent cache merging. */
-	cache = kmem_cache_create("test_cache", 200, 0, 0, empty_cache_ctor);
-	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
-	kmem_cache_destroy(cache);
-	KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_destroy(cache));
-}
-
 static void kasan_memchr(struct kunit *test)
 {
 	char *ptr;
@@ -1464,79 +1537,6 @@ static void kasan_bitops_tags(struct kunit *test)
 	kfree(bits);
 }
 
-static void kmalloc_double_kzfree(struct kunit *test)
-{
-	char *ptr;
-	size_t size = 16;
-
-	ptr = kmalloc(size, GFP_KERNEL);
-	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
-
-	kfree_sensitive(ptr);
-	KUNIT_EXPECT_KASAN_FAIL(test, kfree_sensitive(ptr));
-}
-
-/*
- * The two tests below check that Generic KASAN prints auxiliary stack traces
- * for RCU callbacks and workqueues. The reports need to be inspected manually.
- *
- * These tests are still enabled for other KASAN modes to make sure that all
- * modes report bad accesses in tested scenarios.
- */
-
-static struct kasan_rcu_info {
-	int i;
-	struct rcu_head rcu;
-} *global_rcu_ptr;
-
-static void rcu_uaf_reclaim(struct rcu_head *rp)
-{
-	struct kasan_rcu_info *fp =
-		container_of(rp, struct kasan_rcu_info, rcu);
-
-	kfree(fp);
-	((volatile struct kasan_rcu_info *)fp)->i;
-}
-
-static void rcu_uaf(struct kunit *test)
-{
-	struct kasan_rcu_info *ptr;
-
-	ptr = kmalloc(sizeof(struct kasan_rcu_info), GFP_KERNEL);
-	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
-
-	global_rcu_ptr = rcu_dereference_protected(
-				(struct kasan_rcu_info __rcu *)ptr, NULL);
-
-	KUNIT_EXPECT_KASAN_FAIL(test,
-		call_rcu(&global_rcu_ptr->rcu, rcu_uaf_reclaim);
-		rcu_barrier());
-}
-
-static void workqueue_uaf_work(struct work_struct *work)
-{
-	kfree(work);
-}
-
-static void workqueue_uaf(struct kunit *test)
-{
-	struct workqueue_struct *workqueue;
-	struct work_struct *work;
-
-	workqueue = create_workqueue("kasan_workqueue_test");
-	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, workqueue);
-
-	work = kmalloc(sizeof(struct work_struct), GFP_KERNEL);
-	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, work);
-
-	INIT_WORK(work, workqueue_uaf_work);
-	queue_work(workqueue, work);
-	destroy_workqueue(workqueue);
-
-	KUNIT_EXPECT_KASAN_FAIL(test,
-		((volatile struct work_struct *)work)->data);
-}
-
 static void vmalloc_helpers_tags(struct kunit *test)
 {
 	void *ptr;
@@ -1823,12 +1823,12 @@ static struct kunit_case kasan_kunit_test_cases[] = {
 	KUNIT_CASE(kmalloc_oob_right),
 	KUNIT_CASE(kmalloc_oob_left),
 	KUNIT_CASE(kmalloc_node_oob_right),
+	KUNIT_CASE(kmalloc_big_oob_right),
 	KUNIT_CASE(kmalloc_large_oob_right),
 	KUNIT_CASE(kmalloc_large_uaf),
 	KUNIT_CASE(kmalloc_large_invalid_free),
 	KUNIT_CASE(page_alloc_oob_right),
 	KUNIT_CASE(page_alloc_uaf),
-	KUNIT_CASE(kmalloc_big_oob_right),
 	KUNIT_CASE(krealloc_more_oob),
 	KUNIT_CASE(krealloc_less_oob),
 	KUNIT_CASE(krealloc_large_more_oob),
@@ -1847,9 +1847,17 @@ static struct kunit_case kasan_kunit_test_cases[] = {
 	KUNIT_CASE(kmalloc_uaf_memset),
 	KUNIT_CASE(kmalloc_uaf2),
 	KUNIT_CASE(kmalloc_uaf3),
+	KUNIT_CASE(kmalloc_double_kzfree),
+	KUNIT_CASE(ksize_unpoisons_memory),
+	KUNIT_CASE(ksize_uaf),
+	KUNIT_CASE(rcu_uaf),
+	KUNIT_CASE(workqueue_uaf),
 	KUNIT_CASE(kfree_via_page),
 	KUNIT_CASE(kfree_via_phys),
 	KUNIT_CASE(kmem_cache_oob),
+	KUNIT_CASE(kmem_cache_double_free),
+	KUNIT_CASE(kmem_cache_invalid_free),
+	KUNIT_CASE(kmem_cache_double_destroy),
 	KUNIT_CASE(kmem_cache_accounted),
 	KUNIT_CASE(kmem_cache_bulk),
 	KUNIT_CASE(mempool_kmalloc_oob_right),
@@ -1869,19 +1877,11 @@ static struct kunit_case kasan_kunit_test_cases[] = {
 	KUNIT_CASE(kasan_stack_oob),
 	KUNIT_CASE(kasan_alloca_oob_left),
 	KUNIT_CASE(kasan_alloca_oob_right),
-	KUNIT_CASE(ksize_unpoisons_memory),
-	KUNIT_CASE(ksize_uaf),
-	KUNIT_CASE(kmem_cache_double_free),
-	KUNIT_CASE(kmem_cache_invalid_free),
-	KUNIT_CASE(kmem_cache_double_destroy),
 	KUNIT_CASE(kasan_memchr),
 	KUNIT_CASE(kasan_memcmp),
 	KUNIT_CASE(kasan_strings),
 	KUNIT_CASE(kasan_bitops_generic),
 	KUNIT_CASE(kasan_bitops_tags),
-	KUNIT_CASE(kmalloc_double_kzfree),
-	KUNIT_CASE(rcu_uaf),
-	KUNIT_CASE(workqueue_uaf),
 	KUNIT_CASE(vmalloc_helpers_tags),
 	KUNIT_CASE(vmalloc_oob),
 	KUNIT_CASE(vmap_tags),
-- 
2.25.1