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kasan: reorder tests
Put closely related tests next to each other. No functional changes. Link: https://lkml.kernel.org/r/acf0ee309394dbb5764c400434753ff030dd3d6c.1703024586.git.andreyknvl@google.com Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Cc: Alexander Lobakin <alobakin@pm.me> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Breno Leitao <leitao@debian.org> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Evgenii Stepanov <eugenis@google.com> Cc: Marco Elver <elver@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Andrey Konovalov
Andrew Morton
parent
0f18ea6ea4
commit
86b1596983
@ -213,6 +213,23 @@ static void kmalloc_node_oob_right(struct kunit *test)
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kfree(ptr);
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}
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/*
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* Check that KASAN detects an out-of-bounds access for a big object allocated
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* via kmalloc(). But not as big as to trigger the page_alloc fallback for SLUB.
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*/
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static void kmalloc_big_oob_right(struct kunit *test)
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{
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char *ptr;
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size_t size = KMALLOC_MAX_CACHE_SIZE - 256;
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ptr = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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OPTIMIZER_HIDE_VAR(ptr);
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KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 0);
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kfree(ptr);
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}
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/*
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* The kmalloc_large_* tests below use kmalloc() to allocate a memory chunk
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* that does not fit into the largest slab cache and therefore is allocated via
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@ -299,23 +316,6 @@ static void page_alloc_uaf(struct kunit *test)
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KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[0]);
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}
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/*
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* Check that KASAN detects an out-of-bounds access for a big object allocated
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* via kmalloc(). But not as big as to trigger the page_alloc fallback for SLUB.
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*/
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static void kmalloc_big_oob_right(struct kunit *test)
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{
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char *ptr;
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size_t size = KMALLOC_MAX_CACHE_SIZE - 256;
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ptr = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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OPTIMIZER_HIDE_VAR(ptr);
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KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 0);
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kfree(ptr);
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}
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static void krealloc_more_oob_helper(struct kunit *test,
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size_t size1, size_t size2)
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{
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@ -710,6 +710,126 @@ static void kmalloc_uaf3(struct kunit *test)
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KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr1)[8]);
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}
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static void kmalloc_double_kzfree(struct kunit *test)
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{
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char *ptr;
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size_t size = 16;
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ptr = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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kfree_sensitive(ptr);
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KUNIT_EXPECT_KASAN_FAIL(test, kfree_sensitive(ptr));
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}
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/* Check that ksize() does NOT unpoison whole object. */
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static void ksize_unpoisons_memory(struct kunit *test)
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{
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char *ptr;
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size_t size = 128 - KASAN_GRANULE_SIZE - 5;
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size_t real_size;
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ptr = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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real_size = ksize(ptr);
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KUNIT_EXPECT_GT(test, real_size, size);
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OPTIMIZER_HIDE_VAR(ptr);
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/* These accesses shouldn't trigger a KASAN report. */
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ptr[0] = 'x';
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ptr[size - 1] = 'x';
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/* These must trigger a KASAN report. */
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if (IS_ENABLED(CONFIG_KASAN_GENERIC))
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KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[size]);
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KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[size + 5]);
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KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[real_size - 1]);
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kfree(ptr);
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}
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/*
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* Check that a use-after-free is detected by ksize() and via normal accesses
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* after it.
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*/
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static void ksize_uaf(struct kunit *test)
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{
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char *ptr;
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int size = 128 - KASAN_GRANULE_SIZE;
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ptr = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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kfree(ptr);
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OPTIMIZER_HIDE_VAR(ptr);
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KUNIT_EXPECT_KASAN_FAIL(test, ksize(ptr));
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KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[0]);
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KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[size]);
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}
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/*
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* The two tests below check that Generic KASAN prints auxiliary stack traces
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* for RCU callbacks and workqueues. The reports need to be inspected manually.
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*
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* These tests are still enabled for other KASAN modes to make sure that all
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* modes report bad accesses in tested scenarios.
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*/
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static struct kasan_rcu_info {
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int i;
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struct rcu_head rcu;
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} *global_rcu_ptr;
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static void rcu_uaf_reclaim(struct rcu_head *rp)
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{
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struct kasan_rcu_info *fp =
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container_of(rp, struct kasan_rcu_info, rcu);
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kfree(fp);
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((volatile struct kasan_rcu_info *)fp)->i;
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}
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static void rcu_uaf(struct kunit *test)
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{
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struct kasan_rcu_info *ptr;
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ptr = kmalloc(sizeof(struct kasan_rcu_info), GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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global_rcu_ptr = rcu_dereference_protected(
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(struct kasan_rcu_info __rcu *)ptr, NULL);
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KUNIT_EXPECT_KASAN_FAIL(test,
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call_rcu(&global_rcu_ptr->rcu, rcu_uaf_reclaim);
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rcu_barrier());
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}
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static void workqueue_uaf_work(struct work_struct *work)
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{
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kfree(work);
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}
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static void workqueue_uaf(struct kunit *test)
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{
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struct workqueue_struct *workqueue;
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struct work_struct *work;
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workqueue = create_workqueue("kasan_workqueue_test");
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, workqueue);
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work = kmalloc(sizeof(struct work_struct), GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, work);
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INIT_WORK(work, workqueue_uaf_work);
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queue_work(workqueue, work);
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destroy_workqueue(workqueue);
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KUNIT_EXPECT_KASAN_FAIL(test,
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((volatile struct work_struct *)work)->data);
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}
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static void kfree_via_page(struct kunit *test)
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{
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char *ptr;
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@ -760,6 +880,69 @@ static void kmem_cache_oob(struct kunit *test)
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kmem_cache_destroy(cache);
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}
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static void kmem_cache_double_free(struct kunit *test)
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{
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char *p;
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size_t size = 200;
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struct kmem_cache *cache;
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cache = kmem_cache_create("test_cache", size, 0, 0, NULL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
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p = kmem_cache_alloc(cache, GFP_KERNEL);
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if (!p) {
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kunit_err(test, "Allocation failed: %s\n", __func__);
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kmem_cache_destroy(cache);
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return;
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}
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kmem_cache_free(cache, p);
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KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_free(cache, p));
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kmem_cache_destroy(cache);
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}
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static void kmem_cache_invalid_free(struct kunit *test)
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{
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char *p;
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size_t size = 200;
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struct kmem_cache *cache;
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cache = kmem_cache_create("test_cache", size, 0, SLAB_TYPESAFE_BY_RCU,
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NULL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
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p = kmem_cache_alloc(cache, GFP_KERNEL);
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if (!p) {
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kunit_err(test, "Allocation failed: %s\n", __func__);
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kmem_cache_destroy(cache);
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return;
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}
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/* Trigger invalid free, the object doesn't get freed. */
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KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_free(cache, p + 1));
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/*
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* Properly free the object to prevent the "Objects remaining in
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* test_cache on __kmem_cache_shutdown" BUG failure.
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*/
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kmem_cache_free(cache, p);
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kmem_cache_destroy(cache);
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}
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static void empty_cache_ctor(void *object) { }
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static void kmem_cache_double_destroy(struct kunit *test)
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{
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struct kmem_cache *cache;
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/* Provide a constructor to prevent cache merging. */
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cache = kmem_cache_create("test_cache", 200, 0, 0, empty_cache_ctor);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
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kmem_cache_destroy(cache);
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KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_destroy(cache));
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}
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static void kmem_cache_accounted(struct kunit *test)
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{
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int i;
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@ -1157,53 +1340,6 @@ static void kasan_global_oob_left(struct kunit *test)
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KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p);
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}
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/* Check that ksize() does NOT unpoison whole object. */
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static void ksize_unpoisons_memory(struct kunit *test)
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{
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char *ptr;
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size_t size = 128 - KASAN_GRANULE_SIZE - 5;
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size_t real_size;
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ptr = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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real_size = ksize(ptr);
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KUNIT_EXPECT_GT(test, real_size, size);
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OPTIMIZER_HIDE_VAR(ptr);
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/* These accesses shouldn't trigger a KASAN report. */
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ptr[0] = 'x';
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ptr[size - 1] = 'x';
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/* These must trigger a KASAN report. */
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if (IS_ENABLED(CONFIG_KASAN_GENERIC))
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KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[size]);
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KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[size + 5]);
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KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[real_size - 1]);
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kfree(ptr);
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}
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/*
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* Check that a use-after-free is detected by ksize() and via normal accesses
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* after it.
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*/
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static void ksize_uaf(struct kunit *test)
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{
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char *ptr;
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int size = 128 - KASAN_GRANULE_SIZE;
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ptr = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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kfree(ptr);
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OPTIMIZER_HIDE_VAR(ptr);
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KUNIT_EXPECT_KASAN_FAIL(test, ksize(ptr));
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KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[0]);
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KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[size]);
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}
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static void kasan_stack_oob(struct kunit *test)
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{
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char stack_array[10];
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@ -1246,69 +1382,6 @@ static void kasan_alloca_oob_right(struct kunit *test)
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KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p);
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}
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static void kmem_cache_double_free(struct kunit *test)
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{
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char *p;
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size_t size = 200;
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struct kmem_cache *cache;
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cache = kmem_cache_create("test_cache", size, 0, 0, NULL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
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p = kmem_cache_alloc(cache, GFP_KERNEL);
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if (!p) {
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kunit_err(test, "Allocation failed: %s\n", __func__);
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kmem_cache_destroy(cache);
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return;
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}
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kmem_cache_free(cache, p);
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KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_free(cache, p));
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kmem_cache_destroy(cache);
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}
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static void kmem_cache_invalid_free(struct kunit *test)
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{
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char *p;
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size_t size = 200;
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struct kmem_cache *cache;
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cache = kmem_cache_create("test_cache", size, 0, SLAB_TYPESAFE_BY_RCU,
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NULL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
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p = kmem_cache_alloc(cache, GFP_KERNEL);
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if (!p) {
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kunit_err(test, "Allocation failed: %s\n", __func__);
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kmem_cache_destroy(cache);
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return;
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}
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/* Trigger invalid free, the object doesn't get freed. */
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KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_free(cache, p + 1));
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/*
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* Properly free the object to prevent the "Objects remaining in
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* test_cache on __kmem_cache_shutdown" BUG failure.
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*/
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kmem_cache_free(cache, p);
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kmem_cache_destroy(cache);
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}
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static void empty_cache_ctor(void *object) { }
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static void kmem_cache_double_destroy(struct kunit *test)
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{
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struct kmem_cache *cache;
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/* Provide a constructor to prevent cache merging. */
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cache = kmem_cache_create("test_cache", 200, 0, 0, empty_cache_ctor);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
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kmem_cache_destroy(cache);
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KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_destroy(cache));
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}
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static void kasan_memchr(struct kunit *test)
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{
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char *ptr;
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@ -1470,79 +1543,6 @@ static void kasan_bitops_tags(struct kunit *test)
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kfree(bits);
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}
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static void kmalloc_double_kzfree(struct kunit *test)
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{
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char *ptr;
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size_t size = 16;
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ptr = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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kfree_sensitive(ptr);
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KUNIT_EXPECT_KASAN_FAIL(test, kfree_sensitive(ptr));
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}
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/*
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* The two tests below check that Generic KASAN prints auxiliary stack traces
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* for RCU callbacks and workqueues. The reports need to be inspected manually.
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*
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* These tests are still enabled for other KASAN modes to make sure that all
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* modes report bad accesses in tested scenarios.
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*/
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static struct kasan_rcu_info {
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int i;
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struct rcu_head rcu;
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} *global_rcu_ptr;
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static void rcu_uaf_reclaim(struct rcu_head *rp)
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{
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struct kasan_rcu_info *fp =
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container_of(rp, struct kasan_rcu_info, rcu);
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kfree(fp);
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((volatile struct kasan_rcu_info *)fp)->i;
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}
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static void rcu_uaf(struct kunit *test)
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{
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struct kasan_rcu_info *ptr;
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ptr = kmalloc(sizeof(struct kasan_rcu_info), GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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global_rcu_ptr = rcu_dereference_protected(
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(struct kasan_rcu_info __rcu *)ptr, NULL);
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KUNIT_EXPECT_KASAN_FAIL(test,
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call_rcu(&global_rcu_ptr->rcu, rcu_uaf_reclaim);
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rcu_barrier());
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}
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static void workqueue_uaf_work(struct work_struct *work)
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{
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kfree(work);
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}
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static void workqueue_uaf(struct kunit *test)
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{
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struct workqueue_struct *workqueue;
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struct work_struct *work;
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workqueue = create_workqueue("kasan_workqueue_test");
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, workqueue);
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work = kmalloc(sizeof(struct work_struct), GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, work);
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INIT_WORK(work, workqueue_uaf_work);
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queue_work(workqueue, work);
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destroy_workqueue(workqueue);
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KUNIT_EXPECT_KASAN_FAIL(test,
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((volatile struct work_struct *)work)->data);
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}
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static void vmalloc_helpers_tags(struct kunit *test)
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{
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void *ptr;
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@ -1829,12 +1829,12 @@ static struct kunit_case kasan_kunit_test_cases[] = {
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KUNIT_CASE(kmalloc_oob_right),
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KUNIT_CASE(kmalloc_oob_left),
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KUNIT_CASE(kmalloc_node_oob_right),
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KUNIT_CASE(kmalloc_big_oob_right),
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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),
|
||||
@ -1853,9 +1853,17 @@ 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),
|
||||
@ -1875,19 +1883,11 @@ 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),
|
||||
|
||||
Loading…
Reference in New Issue
Block a user