diff options
Diffstat (limited to 'mm/kasan/kasan_test.c')
| -rw-r--r-- | mm/kasan/kasan_test.c | 793 |
1 files changed, 554 insertions, 239 deletions
diff --git a/mm/kasan/kasan_test.c b/mm/kasan/kasan_test.c index 34515a106ca5..971cfff4ca0b 100644 --- a/mm/kasan/kasan_test.c +++ b/mm/kasan/kasan_test.c @@ -13,6 +13,7 @@ #include <linux/io.h> #include <linux/kasan.h> #include <linux/kernel.h> +#include <linux/mempool.h> #include <linux/mm.h> #include <linux/mman.h> #include <linux/module.h> @@ -213,17 +214,32 @@ static void kmalloc_node_oob_right(struct kunit *test) } /* - * These kmalloc_pagealloc_* tests try allocating a memory chunk that doesn't - * fit into a slab cache and therefore is allocated via the page allocator - * fallback. Since this kind of fallback is only implemented for SLUB, these - * tests are limited to that allocator. + * 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. */ -static void kmalloc_pagealloc_oob_right(struct kunit *test) +static void kmalloc_big_oob_right(struct kunit *test) { char *ptr; - size_t size = KMALLOC_MAX_CACHE_SIZE + 10; + 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); +} - KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB); +/* + * 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 + * the page_alloc fallback. + */ + +static void kmalloc_large_oob_right(struct kunit *test) +{ + char *ptr; + size_t size = KMALLOC_MAX_CACHE_SIZE + 10; ptr = kmalloc(size, GFP_KERNEL); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); @@ -234,13 +250,11 @@ static void kmalloc_pagealloc_oob_right(struct kunit *test) kfree(ptr); } -static void kmalloc_pagealloc_uaf(struct kunit *test) +static void kmalloc_large_uaf(struct kunit *test) { char *ptr; size_t size = KMALLOC_MAX_CACHE_SIZE + 10; - KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB); - ptr = kmalloc(size, GFP_KERNEL); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); kfree(ptr); @@ -248,20 +262,18 @@ static void kmalloc_pagealloc_uaf(struct kunit *test) KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[0]); } -static void kmalloc_pagealloc_invalid_free(struct kunit *test) +static void kmalloc_large_invalid_free(struct kunit *test) { char *ptr; size_t size = KMALLOC_MAX_CACHE_SIZE + 10; - KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB); - ptr = kmalloc(size, GFP_KERNEL); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); KUNIT_EXPECT_KASAN_FAIL(test, kfree(ptr + 1)); } -static void pagealloc_oob_right(struct kunit *test) +static void page_alloc_oob_right(struct kunit *test) { char *ptr; struct page *pages; @@ -283,7 +295,7 @@ static void pagealloc_oob_right(struct kunit *test) free_pages((unsigned long)ptr, order); } -static void pagealloc_uaf(struct kunit *test) +static void page_alloc_uaf(struct kunit *test) { char *ptr; struct page *pages; @@ -297,23 +309,6 @@ static void pagealloc_uaf(struct kunit *test) KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[0]); } -static void kmalloc_large_oob_right(struct kunit *test) -{ - char *ptr; - size_t size = KMALLOC_MAX_CACHE_SIZE - 256; - - /* - * Allocate a chunk that is large enough, but still fits into a slab - * and does not trigger the page allocator fallback in SLUB. - */ - 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) { @@ -403,20 +398,14 @@ static void krealloc_less_oob(struct kunit *test) krealloc_less_oob_helper(test, 235, 201); } -static void krealloc_pagealloc_more_oob(struct kunit *test) +static void krealloc_large_more_oob(struct kunit *test) { - /* page_alloc fallback in only implemented for SLUB. */ - KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB); - krealloc_more_oob_helper(test, KMALLOC_MAX_CACHE_SIZE + 201, KMALLOC_MAX_CACHE_SIZE + 235); } -static void krealloc_pagealloc_less_oob(struct kunit *test) +static void krealloc_large_less_oob(struct kunit *test) { - /* page_alloc fallback in only implemented for SLUB. */ - KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB); - krealloc_less_oob_helper(test, KMALLOC_MAX_CACHE_SIZE + 235, KMALLOC_MAX_CACHE_SIZE + 201); } @@ -708,6 +697,126 @@ 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; @@ -758,6 +867,69 @@ 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; @@ -810,6 +982,303 @@ static void kmem_cache_bulk(struct kunit *test) kmem_cache_destroy(cache); } +static void *mempool_prepare_kmalloc(struct kunit *test, mempool_t *pool, size_t size) +{ + int pool_size = 4; + int ret; + void *elem; + + memset(pool, 0, sizeof(*pool)); + ret = mempool_init_kmalloc_pool(pool, pool_size, size); + KUNIT_ASSERT_EQ(test, ret, 0); + + /* + * Allocate one element to prevent mempool from freeing elements to the + * underlying allocator and instead make it add them to the element + * list when the tests trigger double-free and invalid-free bugs. + * This allows testing KASAN annotations in add_element(). + */ + elem = mempool_alloc_preallocated(pool); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, elem); + + return elem; +} + +static struct kmem_cache *mempool_prepare_slab(struct kunit *test, mempool_t *pool, size_t size) +{ + struct kmem_cache *cache; + int pool_size = 4; + int ret; + + cache = kmem_cache_create("test_cache", size, 0, 0, NULL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); + + memset(pool, 0, sizeof(*pool)); + ret = mempool_init_slab_pool(pool, pool_size, cache); + KUNIT_ASSERT_EQ(test, ret, 0); + + /* + * Do not allocate one preallocated element, as we skip the double-free + * and invalid-free tests for slab mempool for simplicity. + */ + + return cache; +} + +static void *mempool_prepare_page(struct kunit *test, mempool_t *pool, int order) +{ + int pool_size = 4; + int ret; + void *elem; + + memset(pool, 0, sizeof(*pool)); + ret = mempool_init_page_pool(pool, pool_size, order); + KUNIT_ASSERT_EQ(test, ret, 0); + + elem = mempool_alloc_preallocated(pool); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, elem); + + return elem; +} + +static void mempool_oob_right_helper(struct kunit *test, mempool_t *pool, size_t size) +{ + char *elem; + + elem = mempool_alloc_preallocated(pool); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, elem); + + OPTIMIZER_HIDE_VAR(elem); + + if (IS_ENABLED(CONFIG_KASAN_GENERIC)) + KUNIT_EXPECT_KASAN_FAIL(test, + ((volatile char *)&elem[size])[0]); + else + KUNIT_EXPECT_KASAN_FAIL(test, + ((volatile char *)&elem[round_up(size, KASAN_GRANULE_SIZE)])[0]); + + mempool_free(elem, pool); +} + +static void mempool_kmalloc_oob_right(struct kunit *test) +{ + mempool_t pool; + size_t size = 128 - KASAN_GRANULE_SIZE - 5; + void *extra_elem; + + extra_elem = mempool_prepare_kmalloc(test, &pool, size); + + mempool_oob_right_helper(test, &pool, size); + + mempool_free(extra_elem, &pool); + mempool_exit(&pool); +} + +static void mempool_kmalloc_large_oob_right(struct kunit *test) +{ + mempool_t pool; + size_t size = KMALLOC_MAX_CACHE_SIZE + 1; + void *extra_elem; + + extra_elem = mempool_prepare_kmalloc(test, &pool, size); + + mempool_oob_right_helper(test, &pool, size); + + mempool_free(extra_elem, &pool); + mempool_exit(&pool); +} + +static void mempool_slab_oob_right(struct kunit *test) +{ + mempool_t pool; + size_t size = 123; + struct kmem_cache *cache; + + cache = mempool_prepare_slab(test, &pool, size); + + mempool_oob_right_helper(test, &pool, size); + + mempool_exit(&pool); + kmem_cache_destroy(cache); +} + +/* + * Skip the out-of-bounds test for page mempool. With Generic KASAN, page + * allocations have no redzones, and thus the out-of-bounds detection is not + * guaranteed; see https://bugzilla.kernel.org/show_bug.cgi?id=210503. With + * the tag-based KASAN modes, the neighboring allocation might have the same + * tag; see https://bugzilla.kernel.org/show_bug.cgi?id=203505. + */ + +static void mempool_uaf_helper(struct kunit *test, mempool_t *pool, bool page) +{ + char *elem, *ptr; + + elem = mempool_alloc_preallocated(pool); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, elem); + + mempool_free(elem, pool); + + ptr = page ? page_address((struct page *)elem) : elem; + KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[0]); +} + +static void mempool_kmalloc_uaf(struct kunit *test) +{ + mempool_t pool; + size_t size = 128; + void *extra_elem; + + extra_elem = mempool_prepare_kmalloc(test, &pool, size); + + mempool_uaf_helper(test, &pool, false); + + mempool_free(extra_elem, &pool); + mempool_exit(&pool); +} + +static void mempool_kmalloc_large_uaf(struct kunit *test) +{ + mempool_t pool; + size_t size = KMALLOC_MAX_CACHE_SIZE + 1; + void *extra_elem; + + extra_elem = mempool_prepare_kmalloc(test, &pool, size); + + mempool_uaf_helper(test, &pool, false); + + mempool_free(extra_elem, &pool); + mempool_exit(&pool); +} + +static void mempool_slab_uaf(struct kunit *test) +{ + mempool_t pool; + size_t size = 123; + struct kmem_cache *cache; + + cache = mempool_prepare_slab(test, &pool, size); + + mempool_uaf_helper(test, &pool, false); + + mempool_exit(&pool); + kmem_cache_destroy(cache); +} + +static void mempool_page_alloc_uaf(struct kunit *test) +{ + mempool_t pool; + int order = 2; + void *extra_elem; + + extra_elem = mempool_prepare_page(test, &pool, order); + + mempool_uaf_helper(test, &pool, true); + + mempool_free(extra_elem, &pool); + mempool_exit(&pool); +} + +static void mempool_double_free_helper(struct kunit *test, mempool_t *pool) +{ + char *elem; + + elem = mempool_alloc_preallocated(pool); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, elem); + + mempool_free(elem, pool); + + KUNIT_EXPECT_KASAN_FAIL(test, mempool_free(elem, pool)); +} + +static void mempool_kmalloc_double_free(struct kunit *test) +{ + mempool_t pool; + size_t size = 128; + char *extra_elem; + + extra_elem = mempool_prepare_kmalloc(test, &pool, size); + + mempool_double_free_helper(test, &pool); + + mempool_free(extra_elem, &pool); + mempool_exit(&pool); +} + +static void mempool_kmalloc_large_double_free(struct kunit *test) +{ + mempool_t pool; + size_t size = KMALLOC_MAX_CACHE_SIZE + 1; + char *extra_elem; + + extra_elem = mempool_prepare_kmalloc(test, &pool, size); + + mempool_double_free_helper(test, &pool); + + mempool_free(extra_elem, &pool); + mempool_exit(&pool); +} + +static void mempool_page_alloc_double_free(struct kunit *test) +{ + mempool_t pool; + int order = 2; + char *extra_elem; + + extra_elem = mempool_prepare_page(test, &pool, order); + + mempool_double_free_helper(test, &pool); + + mempool_free(extra_elem, &pool); + mempool_exit(&pool); +} + +static void mempool_kmalloc_invalid_free_helper(struct kunit *test, mempool_t *pool) +{ + char *elem; + + elem = mempool_alloc_preallocated(pool); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, elem); + + KUNIT_EXPECT_KASAN_FAIL(test, mempool_free(elem + 1, pool)); + + mempool_free(elem, pool); +} + +static void mempool_kmalloc_invalid_free(struct kunit *test) +{ + mempool_t pool; + size_t size = 128; + char *extra_elem; + + extra_elem = mempool_prepare_kmalloc(test, &pool, size); + + mempool_kmalloc_invalid_free_helper(test, &pool); + + mempool_free(extra_elem, &pool); + mempool_exit(&pool); +} + +static void mempool_kmalloc_large_invalid_free(struct kunit *test) +{ + mempool_t pool; + size_t size = KMALLOC_MAX_CACHE_SIZE + 1; + char *extra_elem; + + extra_elem = mempool_prepare_kmalloc(test, &pool, size); + + mempool_kmalloc_invalid_free_helper(test, &pool); + + mempool_free(extra_elem, &pool); + mempool_exit(&pool); +} + +/* + * Skip the invalid-free test for page mempool. The invalid-free detection only + * works for compound pages and mempool preallocates all page elements without + * the __GFP_COMP flag. + */ + static char global_array[10]; static void kasan_global_oob_right(struct kunit *test) @@ -849,53 +1318,6 @@ 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]; @@ -938,69 +1360,6 @@ 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; @@ -1162,79 +1521,6 @@ 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; @@ -1244,6 +1530,9 @@ static void vmalloc_helpers_tags(struct kunit *test) KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_VMALLOC); + if (!kasan_vmalloc_enabled()) + kunit_skip(test, "Test requires kasan.vmalloc=on"); + ptr = vmalloc(PAGE_SIZE); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); @@ -1278,6 +1567,9 @@ static void vmalloc_oob(struct kunit *test) KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_VMALLOC); + if (!kasan_vmalloc_enabled()) + kunit_skip(test, "Test requires kasan.vmalloc=on"); + v_ptr = vmalloc(size); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, v_ptr); @@ -1331,6 +1623,9 @@ static void vmap_tags(struct kunit *test) KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_VMALLOC); + if (!kasan_vmalloc_enabled()) + kunit_skip(test, "Test requires kasan.vmalloc=on"); + p_page = alloc_pages(GFP_KERNEL, 1); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, p_page); p_ptr = page_address(p_page); @@ -1449,7 +1744,7 @@ static void match_all_not_assigned(struct kunit *test) free_pages((unsigned long)ptr, order); } - if (!IS_ENABLED(CONFIG_KASAN_VMALLOC)) + if (!kasan_vmalloc_enabled()) return; for (i = 0; i < 256; i++) { @@ -1502,6 +1797,14 @@ static void match_all_mem_tag(struct kunit *test) /* For each possible tag value not matching the pointer tag. */ for (tag = KASAN_TAG_MIN; tag <= KASAN_TAG_KERNEL; tag++) { + /* + * For Software Tag-Based KASAN, skip the majority of tag + * values to avoid the test printing too many reports. + */ + if (IS_ENABLED(CONFIG_KASAN_SW_TAGS) && + tag >= KASAN_TAG_MIN + 8 && tag <= KASAN_TAG_KERNEL - 8) + continue; + if (tag == get_tag(ptr)) continue; @@ -1521,16 +1824,16 @@ 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_pagealloc_oob_right), - KUNIT_CASE(kmalloc_pagealloc_uaf), - KUNIT_CASE(kmalloc_pagealloc_invalid_free), - KUNIT_CASE(pagealloc_oob_right), - KUNIT_CASE(pagealloc_uaf), + 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(krealloc_more_oob), KUNIT_CASE(krealloc_less_oob), - KUNIT_CASE(krealloc_pagealloc_more_oob), - KUNIT_CASE(krealloc_pagealloc_less_oob), + KUNIT_CASE(krealloc_large_more_oob), + KUNIT_CASE(krealloc_large_less_oob), KUNIT_CASE(krealloc_uaf), KUNIT_CASE(kmalloc_oob_16), KUNIT_CASE(kmalloc_uaf_16), @@ -1545,29 +1848,41 @@ 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), + KUNIT_CASE(mempool_kmalloc_large_oob_right), + KUNIT_CASE(mempool_slab_oob_right), + KUNIT_CASE(mempool_kmalloc_uaf), + KUNIT_CASE(mempool_kmalloc_large_uaf), + KUNIT_CASE(mempool_slab_uaf), + KUNIT_CASE(mempool_page_alloc_uaf), + KUNIT_CASE(mempool_kmalloc_double_free), + KUNIT_CASE(mempool_kmalloc_large_double_free), + KUNIT_CASE(mempool_page_alloc_double_free), + KUNIT_CASE(mempool_kmalloc_invalid_free), + KUNIT_CASE(mempool_kmalloc_large_invalid_free), KUNIT_CASE(kasan_global_oob_right), KUNIT_CASE(kasan_global_oob_left), 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), |