| Message ID | 20200805042938.2961494-4-davidgow@google.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | KASAN-KUnit Integration | expand |
On Wed, Aug 5, 2020 at 6:29 AM David Gow <davidgow@google.com> wrote: > > From: Patricia Alfonso <trishalfonso@google.com> > > Transfer all previous tests for KASAN to KUnit so they can be run > more easily. Using kunit_tool, developers can run these tests with their > other KUnit tests and see "pass" or "fail" with the appropriate KASAN > report instead of needing to parse each KASAN report to test KASAN > functionalities. All KASAN reports are still printed to dmesg. > > Stack tests do not work properly when KASAN_STACK is enabled so > those tests use a check for "if IS_ENABLED(CONFIG_KASAN_STACK)" so they > only run if stack instrumentation is enabled. If KASAN_STACK is not > enabled, KUnit will print a statement to let the user know this test > was not run with KASAN_STACK enabled. > > copy_user_test and kasan_rcu_uaf cannot be run in KUnit so there is a > separate test file for those tests, which can be run as before as a > module. > > Signed-off-by: Patricia Alfonso <trishalfonso@google.com> > Signed-off-by: David Gow <davidgow@google.com> > Reviewed-by: Brendan Higgins <brendanhiggins@google.com> > Reviewed-by: Andrey Konovalov <andreyknvl@google.com> > Reviewed-by: Dmitry Vyukov <dvyukov@google.com> > --- > lib/Kconfig.kasan | 22 +- > lib/Makefile | 3 +- > lib/test_kasan.c | 686 +++++++++++++++------------------------- > lib/test_kasan_module.c | 111 +++++++ > 4 files changed, 385 insertions(+), 437 deletions(-) > create mode 100644 lib/test_kasan_module.c > > diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan > index 047b53dbfd58..9a237887e52e 100644 > --- a/lib/Kconfig.kasan > +++ b/lib/Kconfig.kasan > @@ -167,12 +167,24 @@ config KASAN_VMALLOC > for KASAN to detect more sorts of errors (and to support vmapped > stacks), but at the cost of higher memory usage. > > -config TEST_KASAN > - tristate "Module for testing KASAN for bug detection" > - depends on m > +config KASAN_KUNIT_TEST > + tristate "KUnit-compatible tests of KASAN bug detection capabilities" if !KUNIT_ALL_TESTS > + depends on KASAN && KUNIT > + default KUNIT_ALL_TESTS > help > - This is a test module doing various nasty things like > - out of bounds accesses, use after free. It is useful for testing > + This is a KUnit test suite doing various nasty things like > + out of bounds and use after free accesses. It is useful for testing > kernel debugging features like KASAN. > > + For more information on KUnit and unit tests in general, please refer > + to the KUnit documentation in Documentation/dev-tools/kunit > + > +config TEST_KASAN_MODULE > + tristate "KUnit-incompatible tests of KASAN bug detection capabilities" > + depends on m && KASAN > + help > + This is a part of the KASAN test suite that is incompatible with > + KUnit. Currently includes tests that do bad copy_from/to_user > + accesses. > + > endif # KASAN > diff --git a/lib/Makefile b/lib/Makefile > index 46278be53cda..adaebfac81c9 100644 > --- a/lib/Makefile > +++ b/lib/Makefile > @@ -60,9 +60,10 @@ CFLAGS_test_bitops.o += -Werror > obj-$(CONFIG_TEST_SYSCTL) += test_sysctl.o > obj-$(CONFIG_TEST_HASH) += test_hash.o test_siphash.o > obj-$(CONFIG_TEST_IDA) += test_ida.o > -obj-$(CONFIG_TEST_KASAN) += test_kasan.o > +obj-$(CONFIG_KASAN_KUNIT_TEST) += test_kasan.o > CFLAGS_test_kasan.o += -fno-builtin > CFLAGS_test_kasan.o += $(call cc-disable-warning, vla) > +obj-$(CONFIG_TEST_KASAN_MODULE) += test_kasan_module.o > obj-$(CONFIG_TEST_UBSAN) += test_ubsan.o > CFLAGS_test_ubsan.o += $(call cc-disable-warning, vla) > UBSAN_SANITIZE_test_ubsan.o := y > diff --git a/lib/test_kasan.c b/lib/test_kasan.c > index 58bffadd8367..d023fb75fd60 100644 > --- a/lib/test_kasan.c > +++ b/lib/test_kasan.c > @@ -5,8 +5,6 @@ > * Author: Andrey Ryabinin <a.ryabinin@samsung.com> > */ > > -#define pr_fmt(fmt) "kasan test: %s " fmt, __func__ > - > #include <linux/bitops.h> > #include <linux/delay.h> > #include <linux/kasan.h> > @@ -77,416 +75,327 @@ static void kasan_test_exit(struct kunit *test) > fail_data.report_found); \ > } while (0) > > - > - > -/* > - * Note: test functions are marked noinline so that their names appear in > - * reports. > - */ > -static noinline void __init kmalloc_oob_right(void) > +static void kmalloc_oob_right(struct kunit *test) > { > char *ptr; > size_t size = 123; > > - pr_info("out-of-bounds to right\n"); > ptr = kmalloc(size, GFP_KERNEL); > - if (!ptr) { > - pr_err("Allocation failed\n"); > - return; > - } > - > - ptr[size + OOB_TAG_OFF] = 'x'; > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); > > + KUNIT_EXPECT_KASAN_FAIL(test, ptr[size + OOB_TAG_OFF] = 'x'); > kfree(ptr); > } > > -static noinline void __init kmalloc_oob_left(void) > +static void kmalloc_oob_left(struct kunit *test) > { > char *ptr; > size_t size = 15; > > - pr_info("out-of-bounds to left\n"); > ptr = kmalloc(size, GFP_KERNEL); > - if (!ptr) { > - pr_err("Allocation failed\n"); > - return; > - } > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); > > - *ptr = *(ptr - 1); > + KUNIT_EXPECT_KASAN_FAIL(test, *ptr = *(ptr - 1)); > kfree(ptr); > } > > -static noinline void __init kmalloc_node_oob_right(void) > +static void kmalloc_node_oob_right(struct kunit *test) > { > char *ptr; > size_t size = 4096; > > - pr_info("kmalloc_node(): out-of-bounds to right\n"); > ptr = kmalloc_node(size, GFP_KERNEL, 0); > - if (!ptr) { > - pr_err("Allocation failed\n"); > - return; > - } > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); > > - ptr[size] = 0; > + KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 0); > kfree(ptr); > } > > -#ifdef CONFIG_SLUB > -static noinline void __init kmalloc_pagealloc_oob_right(void) > +static void kmalloc_pagealloc_oob_right(struct kunit *test) > { > char *ptr; > size_t size = KMALLOC_MAX_CACHE_SIZE + 10; > > + if (!IS_ENABLED(CONFIG_SLUB)) { > + kunit_info(test, "CONFIG_SLUB is not enabled."); > + return; > + } > + > /* Allocate a chunk that does not fit into a SLUB cache to trigger > * the page allocator fallback. > */ > - pr_info("kmalloc pagealloc allocation: out-of-bounds to right\n"); > ptr = kmalloc(size, GFP_KERNEL); > - if (!ptr) { > - pr_err("Allocation failed\n"); > - return; > - } > - > - ptr[size + OOB_TAG_OFF] = 0; > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); > > + KUNIT_EXPECT_KASAN_FAIL(test, ptr[size + OOB_TAG_OFF] = 0); > kfree(ptr); > } > > -static noinline void __init kmalloc_pagealloc_uaf(void) > +static void kmalloc_pagealloc_uaf(struct kunit *test) > { > char *ptr; > size_t size = KMALLOC_MAX_CACHE_SIZE + 10; > > - pr_info("kmalloc pagealloc allocation: use-after-free\n"); > - ptr = kmalloc(size, GFP_KERNEL); > - if (!ptr) { > - pr_err("Allocation failed\n"); > + if (!IS_ENABLED(CONFIG_SLUB)) { > + kunit_info(test, "CONFIG_SLUB is not enabled."); > return; > } > > + ptr = kmalloc(size, GFP_KERNEL); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); > + > kfree(ptr); > - ptr[0] = 0; > + KUNIT_EXPECT_KASAN_FAIL(test, ptr[0] = 0); > } > > -static noinline void __init kmalloc_pagealloc_invalid_free(void) > +static void kmalloc_pagealloc_invalid_free(struct kunit *test) > { > char *ptr; > size_t size = KMALLOC_MAX_CACHE_SIZE + 10; > > - pr_info("kmalloc pagealloc allocation: invalid-free\n"); > - ptr = kmalloc(size, GFP_KERNEL); > - if (!ptr) { > - pr_err("Allocation failed\n"); > + if (!IS_ENABLED(CONFIG_SLUB)) { > + kunit_info(test, "CONFIG_SLUB is not enabled."); > return; > } > > - kfree(ptr + 1); > + ptr = kmalloc(size, GFP_KERNEL); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); > + > + KUNIT_EXPECT_KASAN_FAIL(test, kfree(ptr + 1)); > } > -#endif > > -static noinline void __init kmalloc_large_oob_right(void) > +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. > */ > - pr_info("kmalloc large allocation: out-of-bounds to right\n"); > ptr = kmalloc(size, GFP_KERNEL); > - if (!ptr) { > - pr_err("Allocation failed\n"); > - return; > - } > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); > > - ptr[size] = 0; > + KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 0); > kfree(ptr); > } > > -static noinline void __init kmalloc_oob_krealloc_more(void) > +static void kmalloc_oob_krealloc_more(struct kunit *test) > { > char *ptr1, *ptr2; > size_t size1 = 17; > size_t size2 = 19; > > - pr_info("out-of-bounds after krealloc more\n"); > ptr1 = kmalloc(size1, GFP_KERNEL); > - ptr2 = krealloc(ptr1, size2, GFP_KERNEL); > - if (!ptr1 || !ptr2) { > - pr_err("Allocation failed\n"); > - kfree(ptr1); > - kfree(ptr2); > - return; > - } > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); > > - ptr2[size2 + OOB_TAG_OFF] = 'x'; > + ptr2 = krealloc(ptr1, size2, GFP_KERNEL); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2); > > + KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size2 + OOB_TAG_OFF] = 'x'); > kfree(ptr2); > } > > -static noinline void __init kmalloc_oob_krealloc_less(void) > +static void kmalloc_oob_krealloc_less(struct kunit *test) > { > char *ptr1, *ptr2; > size_t size1 = 17; > size_t size2 = 15; > > - pr_info("out-of-bounds after krealloc less\n"); > ptr1 = kmalloc(size1, GFP_KERNEL); > - ptr2 = krealloc(ptr1, size2, GFP_KERNEL); > - if (!ptr1 || !ptr2) { > - pr_err("Allocation failed\n"); > - kfree(ptr1); > - return; > - } > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); > > - ptr2[size2 + OOB_TAG_OFF] = 'x'; > + ptr2 = krealloc(ptr1, size2, GFP_KERNEL); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2); > > + KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size2 + OOB_TAG_OFF] = 'x'); > kfree(ptr2); > } > > -static noinline void __init kmalloc_oob_16(void) > +static void kmalloc_oob_16(struct kunit *test) > { > struct { > u64 words[2]; > } *ptr1, *ptr2; > > - pr_info("kmalloc out-of-bounds for 16-bytes access\n"); > ptr1 = kmalloc(sizeof(*ptr1) - 3, GFP_KERNEL); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); > + > ptr2 = kmalloc(sizeof(*ptr2), GFP_KERNEL); > - if (!ptr1 || !ptr2) { > - pr_err("Allocation failed\n"); > - kfree(ptr1); > - kfree(ptr2); > - return; > - } > - *ptr1 = *ptr2; > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2); > + > + KUNIT_EXPECT_KASAN_FAIL(test, *ptr1 = *ptr2); > kfree(ptr1); > kfree(ptr2); > } > > -static noinline void __init kmalloc_oob_memset_2(void) > +static void kmalloc_oob_memset_2(struct kunit *test) > { > char *ptr; > size_t size = 8; > > - pr_info("out-of-bounds in memset2\n"); > ptr = kmalloc(size, GFP_KERNEL); > - if (!ptr) { > - pr_err("Allocation failed\n"); > - return; > - } > - > - memset(ptr + 7 + OOB_TAG_OFF, 0, 2); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); > > + KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + 7 + OOB_TAG_OFF, 0, 2)); > kfree(ptr); > } > > -static noinline void __init kmalloc_oob_memset_4(void) > +static void kmalloc_oob_memset_4(struct kunit *test) > { > char *ptr; > size_t size = 8; > > - pr_info("out-of-bounds in memset4\n"); > ptr = kmalloc(size, GFP_KERNEL); > - if (!ptr) { > - pr_err("Allocation failed\n"); > - return; > - } > - > - memset(ptr + 5 + OOB_TAG_OFF, 0, 4); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); > > + KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + 5 + OOB_TAG_OFF, 0, 4)); > kfree(ptr); > } > > > -static noinline void __init kmalloc_oob_memset_8(void) > +static void kmalloc_oob_memset_8(struct kunit *test) > { > char *ptr; > size_t size = 8; > > - pr_info("out-of-bounds in memset8\n"); > ptr = kmalloc(size, GFP_KERNEL); > - if (!ptr) { > - pr_err("Allocation failed\n"); > - return; > - } > - > - memset(ptr + 1 + OOB_TAG_OFF, 0, 8); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); > > + KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + 1 + OOB_TAG_OFF, 0, 8)); > kfree(ptr); > } > > -static noinline void __init kmalloc_oob_memset_16(void) > +static void kmalloc_oob_memset_16(struct kunit *test) > { > char *ptr; > size_t size = 16; > > - pr_info("out-of-bounds in memset16\n"); > ptr = kmalloc(size, GFP_KERNEL); > - if (!ptr) { > - pr_err("Allocation failed\n"); > - return; > - } > - > - memset(ptr + 1 + OOB_TAG_OFF, 0, 16); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); > > + KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + 1 + OOB_TAG_OFF, 0, 16)); > kfree(ptr); > } > > -static noinline void __init kmalloc_oob_in_memset(void) > +static void kmalloc_oob_in_memset(struct kunit *test) > { > char *ptr; > size_t size = 666; > > - pr_info("out-of-bounds in memset\n"); > ptr = kmalloc(size, GFP_KERNEL); > - if (!ptr) { > - pr_err("Allocation failed\n"); > - return; > - } > - > - memset(ptr, 0, size + 5 + OOB_TAG_OFF); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); > > + KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr, 0, size + 5 + OOB_TAG_OFF)); > kfree(ptr); > } > > -static noinline void __init kmalloc_memmove_invalid_size(void) > +static void kmalloc_memmove_invalid_size(struct kunit *test) > { > char *ptr; > size_t size = 64; > volatile size_t invalid_size = -2; > > - pr_info("invalid size in memmove\n"); > ptr = kmalloc(size, GFP_KERNEL); > - if (!ptr) { > - pr_err("Allocation failed\n"); > - return; > - } > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); > > memset((char *)ptr, 0, 64); > - memmove((char *)ptr, (char *)ptr + 4, invalid_size); > + > + KUNIT_EXPECT_KASAN_FAIL(test, > + memmove((char *)ptr, (char *)ptr + 4, invalid_size)); > kfree(ptr); > } > > -static noinline void __init kmalloc_uaf(void) > +static void kmalloc_uaf(struct kunit *test) > { > char *ptr; > size_t size = 10; > > - pr_info("use-after-free\n"); > ptr = kmalloc(size, GFP_KERNEL); > - if (!ptr) { > - pr_err("Allocation failed\n"); > - return; > - } > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); > > kfree(ptr); > - *(ptr + 8) = 'x'; > + KUNIT_EXPECT_KASAN_FAIL(test, *(ptr + 8) = 'x'); > } > > -static noinline void __init kmalloc_uaf_memset(void) > +static void kmalloc_uaf_memset(struct kunit *test) > { > char *ptr; > size_t size = 33; > > - pr_info("use-after-free in memset\n"); > ptr = kmalloc(size, GFP_KERNEL); > - if (!ptr) { > - pr_err("Allocation failed\n"); > - return; > - } > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); > > kfree(ptr); > - memset(ptr, 0, size); > + KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr, 0, size)); > } > > -static noinline void __init kmalloc_uaf2(void) > +static void kmalloc_uaf2(struct kunit *test) > { > char *ptr1, *ptr2; > size_t size = 43; > > - pr_info("use-after-free after another kmalloc\n"); > ptr1 = kmalloc(size, GFP_KERNEL); > - if (!ptr1) { > - pr_err("Allocation failed\n"); > - return; > - } > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); > > kfree(ptr1); > + > ptr2 = kmalloc(size, GFP_KERNEL); > - if (!ptr2) { > - pr_err("Allocation failed\n"); > - return; > - } > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2); > + > + KUNIT_EXPECT_KASAN_FAIL(test, ptr1[40] = 'x'); > + KUNIT_EXPECT_PTR_NE(test, ptr1, ptr2); > > - ptr1[40] = 'x'; > - if (ptr1 == ptr2) > - pr_err("Could not detect use-after-free: ptr1 == ptr2\n"); > kfree(ptr2); > } > > -static noinline void __init kfree_via_page(void) > +static void kfree_via_page(struct kunit *test) > { > char *ptr; > size_t size = 8; > struct page *page; > unsigned long offset; > > - pr_info("invalid-free false positive (via page)\n"); > ptr = kmalloc(size, GFP_KERNEL); > - if (!ptr) { > - pr_err("Allocation failed\n"); > - return; > - } > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); > > page = virt_to_page(ptr); > offset = offset_in_page(ptr); > kfree(page_address(page) + offset); > } > > -static noinline void __init kfree_via_phys(void) > +static void kfree_via_phys(struct kunit *test) > { > char *ptr; > size_t size = 8; > phys_addr_t phys; > > - pr_info("invalid-free false positive (via phys)\n"); > ptr = kmalloc(size, GFP_KERNEL); > - if (!ptr) { > - pr_err("Allocation failed\n"); > - return; > - } > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); > > phys = virt_to_phys(ptr); > kfree(phys_to_virt(phys)); > } > > -static noinline void __init kmem_cache_oob(void) > +static void kmem_cache_oob(struct kunit *test) > { > char *p; > size_t size = 200; > struct kmem_cache *cache = kmem_cache_create("test_cache", > size, 0, > 0, NULL); > - if (!cache) { > - pr_err("Cache allocation failed\n"); > - return; > - } > - pr_info("out-of-bounds in kmem_cache_alloc\n"); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); > p = kmem_cache_alloc(cache, GFP_KERNEL); > if (!p) { > - pr_err("Allocation failed\n"); > + kunit_err(test, "Allocation failed: %s\n", __func__); > kmem_cache_destroy(cache); > return; > } > > - *p = p[size + OOB_TAG_OFF]; > - > + KUNIT_EXPECT_KASAN_FAIL(test, *p = p[size + OOB_TAG_OFF]); > kmem_cache_free(cache, p); > kmem_cache_destroy(cache); > } > > -static noinline void __init memcg_accounted_kmem_cache(void) > +static void memcg_accounted_kmem_cache(struct kunit *test) > { > int i; > char *p; > @@ -494,12 +403,8 @@ static noinline void __init memcg_accounted_kmem_cache(void) > struct kmem_cache *cache; > > cache = kmem_cache_create("test_cache", size, 0, SLAB_ACCOUNT, NULL); > - if (!cache) { > - pr_err("Cache allocation failed\n"); > - return; > - } > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); > > - pr_info("allocate memcg accounted object\n"); > /* > * Several allocations with a delay to allow for lazy per memcg kmem > * cache creation. > @@ -519,134 +424,93 @@ static noinline void __init memcg_accounted_kmem_cache(void) > > static char global_array[10]; > > -static noinline void __init kasan_global_oob(void) > +static void kasan_global_oob(struct kunit *test) > { > volatile int i = 3; > char *p = &global_array[ARRAY_SIZE(global_array) + i]; > > - pr_info("out-of-bounds global variable\n"); > - *(volatile char *)p; > -} > - > -static noinline void __init kasan_stack_oob(void) > -{ > - char stack_array[10]; > - volatile int i = OOB_TAG_OFF; > - char *p = &stack_array[ARRAY_SIZE(stack_array) + i]; > - > - pr_info("out-of-bounds on stack\n"); > - *(volatile char *)p; > + KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p); > } > > -static noinline void __init ksize_unpoisons_memory(void) > +static void ksize_unpoisons_memory(struct kunit *test) > { > char *ptr; > size_t size = 123, real_size; > > - pr_info("ksize() unpoisons the whole allocated chunk\n"); > ptr = kmalloc(size, GFP_KERNEL); > - if (!ptr) { > - pr_err("Allocation failed\n"); > - return; > - } > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); > real_size = ksize(ptr); > /* This access doesn't trigger an error. */ > ptr[size] = 'x'; > /* This one does. */ > - ptr[real_size] = 'y'; > + KUNIT_EXPECT_KASAN_FAIL(test, ptr[real_size] = 'y'); > kfree(ptr); > } > > -static noinline void __init copy_user_test(void) > +static void kasan_stack_oob(struct kunit *test) > { > - char *kmem; > - char __user *usermem; > - size_t size = 10; > - int unused; > - > - kmem = kmalloc(size, GFP_KERNEL); > - if (!kmem) > - return; > + char stack_array[10]; > + volatile int i = OOB_TAG_OFF; > + char *p = &stack_array[ARRAY_SIZE(stack_array) + i]; > > - usermem = (char __user *)vm_mmap(NULL, 0, PAGE_SIZE, > - PROT_READ | PROT_WRITE | PROT_EXEC, > - MAP_ANONYMOUS | MAP_PRIVATE, 0); > - if (IS_ERR(usermem)) { > - pr_err("Failed to allocate user memory\n"); > - kfree(kmem); > + if (!IS_ENABLED(CONFIG_KASAN_STACK)) { > + kunit_info(test, "CONFIG_KASAN_STACK is not enabled"); > return; > } > > - pr_info("out-of-bounds in copy_from_user()\n"); > - unused = copy_from_user(kmem, usermem, size + 1 + OOB_TAG_OFF); > - > - pr_info("out-of-bounds in copy_to_user()\n"); > - unused = copy_to_user(usermem, kmem, size + 1 + OOB_TAG_OFF); > - > - pr_info("out-of-bounds in __copy_from_user()\n"); > - unused = __copy_from_user(kmem, usermem, size + 1 + OOB_TAG_OFF); > - > - pr_info("out-of-bounds in __copy_to_user()\n"); > - unused = __copy_to_user(usermem, kmem, size + 1 + OOB_TAG_OFF); > - > - pr_info("out-of-bounds in __copy_from_user_inatomic()\n"); > - unused = __copy_from_user_inatomic(kmem, usermem, size + 1 + OOB_TAG_OFF); > - > - pr_info("out-of-bounds in __copy_to_user_inatomic()\n"); > - unused = __copy_to_user_inatomic(usermem, kmem, size + 1 + OOB_TAG_OFF); > - > - pr_info("out-of-bounds in strncpy_from_user()\n"); > - unused = strncpy_from_user(kmem, usermem, size + 1 + OOB_TAG_OFF); > - > - vm_munmap((unsigned long)usermem, PAGE_SIZE); > - kfree(kmem); > + KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p); > } > > -static noinline void __init kasan_alloca_oob_left(void) > +static void kasan_alloca_oob_left(struct kunit *test) > { > volatile int i = 10; > char alloca_array[i]; > char *p = alloca_array - 1; > > - pr_info("out-of-bounds to left on alloca\n"); > - *(volatile char *)p; > + if (!IS_ENABLED(CONFIG_KASAN_STACK)) { > + kunit_info(test, "CONFIG_KASAN_STACK is not enabled"); > + return; > + } > + > + KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p); > } > > -static noinline void __init kasan_alloca_oob_right(void) > +static void kasan_alloca_oob_right(struct kunit *test) > { > volatile int i = 10; > char alloca_array[i]; > char *p = alloca_array + i; > > - pr_info("out-of-bounds to right on alloca\n"); > - *(volatile char *)p; > + if (!IS_ENABLED(CONFIG_KASAN_STACK)) { > + kunit_info(test, "CONFIG_KASAN_STACK is not enabled"); > + return; > + } > + > + KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p); > } > > -static noinline void __init kmem_cache_double_free(void) > +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); > - if (!cache) { > - pr_err("Cache allocation failed\n"); > - return; > - } > - pr_info("double-free on heap object\n"); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); > + > p = kmem_cache_alloc(cache, GFP_KERNEL); > if (!p) { > - pr_err("Allocation failed\n"); > + kunit_err(test, "Allocation failed: %s\n", __func__); > kmem_cache_destroy(cache); > return; > } > > kmem_cache_free(cache, p); > - kmem_cache_free(cache, p); > + KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_free(cache, p)); > kmem_cache_destroy(cache); > } > > -static noinline void __init kmem_cache_invalid_free(void) > +static void kmem_cache_invalid_free(struct kunit *test) > { > char *p; > size_t size = 200; > @@ -654,20 +518,17 @@ static noinline void __init kmem_cache_invalid_free(void) > > cache = kmem_cache_create("test_cache", size, 0, SLAB_TYPESAFE_BY_RCU, > NULL); > - if (!cache) { > - pr_err("Cache allocation failed\n"); > - return; > - } > - pr_info("invalid-free of heap object\n"); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); > + > p = kmem_cache_alloc(cache, GFP_KERNEL); > if (!p) { > - pr_err("Allocation failed\n"); > + kunit_err(test, "Allocation failed: %s\n", __func__); > kmem_cache_destroy(cache); > return; > } > > /* Trigger invalid free, the object doesn't get freed */ > - kmem_cache_free(cache, p + 1); > + KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_free(cache, p + 1)); > > /* > * Properly free the object to prevent the "Objects remaining in > @@ -678,45 +539,64 @@ static noinline void __init kmem_cache_invalid_free(void) > kmem_cache_destroy(cache); > } > > -static noinline void __init kasan_memchr(void) > +static void kasan_memchr(struct kunit *test) > { > char *ptr; > size_t size = 24; > > - pr_info("out-of-bounds in memchr\n"); > - ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO); > - if (!ptr) > + /* See https://bugzilla.kernel.org/show_bug.cgi?id=206337 */ > + if (IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT)) { > + kunit_info(test, > + "str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT"); > return; > + } > + > + ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); > + > + KUNIT_EXPECT_KASAN_FAIL(test, > + kasan_ptr_result = memchr(ptr, '1', size + 1)); > > kasan_ptr_result = memchr(ptr, '1', size + 1); Looks like this memchr() call is excessive ^ > kfree(ptr); > } > > -static noinline void __init kasan_memcmp(void) > +static void kasan_memcmp(struct kunit *test) > { > char *ptr; > size_t size = 24; > int arr[9]; > > - pr_info("out-of-bounds in memcmp\n"); > - ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO); > - if (!ptr) > + /* See https://bugzilla.kernel.org/show_bug.cgi?id=206337 */ > + if (IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT)) { > + kunit_info(test, > + "str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT"); > return; > + } > > + ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); > memset(arr, 0, sizeof(arr)); > - kasan_int_result = memcmp(ptr, arr, size + 1); > + > + KUNIT_EXPECT_KASAN_FAIL(test, > + kasan_int_result = memcmp(ptr, arr, size+1)); > kfree(ptr); > } > > -static noinline void __init kasan_strings(void) > +static void kasan_strings(struct kunit *test) > { > char *ptr; > size_t size = 24; > > - pr_info("use-after-free in strchr\n"); > - ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO); > - if (!ptr) > + /* See https://bugzilla.kernel.org/show_bug.cgi?id=206337 */ > + if (IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT)) { > + kunit_info(test, > + "str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT"); > return; > + } > + > + ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); > > kfree(ptr); > > @@ -727,220 +607,164 @@ static noinline void __init kasan_strings(void) > * will likely point to zeroed byte. > */ > ptr += 16; > - kasan_ptr_result = strchr(ptr, '1'); > + KUNIT_EXPECT_KASAN_FAIL(test, kasan_ptr_result = strchr(ptr, '1')); > > - pr_info("use-after-free in strrchr\n"); > - kasan_ptr_result = strrchr(ptr, '1'); > + KUNIT_EXPECT_KASAN_FAIL(test, kasan_ptr_result = strrchr(ptr, '1')); > > - pr_info("use-after-free in strcmp\n"); > - kasan_int_result = strcmp(ptr, "2"); > + KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strcmp(ptr, "2")); > > - pr_info("use-after-free in strncmp\n"); > - kasan_int_result = strncmp(ptr, "2", 1); > + KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strncmp(ptr, "2", 1)); > > - pr_info("use-after-free in strlen\n"); > - kasan_int_result = strlen(ptr); > + KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strlen(ptr)); > > - pr_info("use-after-free in strnlen\n"); > - kasan_int_result = strnlen(ptr, 1); > + KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strnlen(ptr, 1)); > } > > -static noinline void __init kasan_bitops(void) > +static void kasan_bitops(struct kunit *test) > { > /* > * Allocate 1 more byte, which causes kzalloc to round up to 16-bytes; > * this way we do not actually corrupt other memory. > */ > long *bits = kzalloc(sizeof(*bits) + 1, GFP_KERNEL); > - if (!bits) > - return; > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, bits); > > /* > * Below calls try to access bit within allocated memory; however, the > * below accesses are still out-of-bounds, since bitops are defined to > * operate on the whole long the bit is in. > */ > - pr_info("out-of-bounds in set_bit\n"); > - set_bit(BITS_PER_LONG, bits); > + KUNIT_EXPECT_KASAN_FAIL(test, set_bit(BITS_PER_LONG, bits)); > > - pr_info("out-of-bounds in __set_bit\n"); > - __set_bit(BITS_PER_LONG, bits); > + KUNIT_EXPECT_KASAN_FAIL(test, __set_bit(BITS_PER_LONG, bits)); > > - pr_info("out-of-bounds in clear_bit\n"); > - clear_bit(BITS_PER_LONG, bits); > + KUNIT_EXPECT_KASAN_FAIL(test, clear_bit(BITS_PER_LONG, bits)); > > - pr_info("out-of-bounds in __clear_bit\n"); > - __clear_bit(BITS_PER_LONG, bits); > + KUNIT_EXPECT_KASAN_FAIL(test, __clear_bit(BITS_PER_LONG, bits)); > > - pr_info("out-of-bounds in clear_bit_unlock\n"); > - clear_bit_unlock(BITS_PER_LONG, bits); > + KUNIT_EXPECT_KASAN_FAIL(test, clear_bit_unlock(BITS_PER_LONG, bits)); > > - pr_info("out-of-bounds in __clear_bit_unlock\n"); > - __clear_bit_unlock(BITS_PER_LONG, bits); > + KUNIT_EXPECT_KASAN_FAIL(test, __clear_bit_unlock(BITS_PER_LONG, bits)); > > - pr_info("out-of-bounds in change_bit\n"); > - change_bit(BITS_PER_LONG, bits); > + KUNIT_EXPECT_KASAN_FAIL(test, change_bit(BITS_PER_LONG, bits)); > > - pr_info("out-of-bounds in __change_bit\n"); > - __change_bit(BITS_PER_LONG, bits); > + KUNIT_EXPECT_KASAN_FAIL(test, __change_bit(BITS_PER_LONG, bits)); > > /* > * Below calls try to access bit beyond allocated memory. > */ > - pr_info("out-of-bounds in test_and_set_bit\n"); > - test_and_set_bit(BITS_PER_LONG + BITS_PER_BYTE, bits); > + KUNIT_EXPECT_KASAN_FAIL(test, > + test_and_set_bit(BITS_PER_LONG + BITS_PER_BYTE, bits)); > > - pr_info("out-of-bounds in __test_and_set_bit\n"); > - __test_and_set_bit(BITS_PER_LONG + BITS_PER_BYTE, bits); > + KUNIT_EXPECT_KASAN_FAIL(test, > + __test_and_set_bit(BITS_PER_LONG + BITS_PER_BYTE, bits)); > > - pr_info("out-of-bounds in test_and_set_bit_lock\n"); > - test_and_set_bit_lock(BITS_PER_LONG + BITS_PER_BYTE, bits); > + KUNIT_EXPECT_KASAN_FAIL(test, > + test_and_set_bit_lock(BITS_PER_LONG + BITS_PER_BYTE, bits)); > > - pr_info("out-of-bounds in test_and_clear_bit\n"); > - test_and_clear_bit(BITS_PER_LONG + BITS_PER_BYTE, bits); > + KUNIT_EXPECT_KASAN_FAIL(test, > + test_and_clear_bit(BITS_PER_LONG + BITS_PER_BYTE, bits)); > > - pr_info("out-of-bounds in __test_and_clear_bit\n"); > - __test_and_clear_bit(BITS_PER_LONG + BITS_PER_BYTE, bits); > + KUNIT_EXPECT_KASAN_FAIL(test, > + __test_and_clear_bit(BITS_PER_LONG + BITS_PER_BYTE, bits)); > > - pr_info("out-of-bounds in test_and_change_bit\n"); > - test_and_change_bit(BITS_PER_LONG + BITS_PER_BYTE, bits); > + KUNIT_EXPECT_KASAN_FAIL(test, > + test_and_change_bit(BITS_PER_LONG + BITS_PER_BYTE, bits)); > > - pr_info("out-of-bounds in __test_and_change_bit\n"); > - __test_and_change_bit(BITS_PER_LONG + BITS_PER_BYTE, bits); > + KUNIT_EXPECT_KASAN_FAIL(test, > + __test_and_change_bit(BITS_PER_LONG + BITS_PER_BYTE, bits)); > > - pr_info("out-of-bounds in test_bit\n"); > - kasan_int_result = test_bit(BITS_PER_LONG + BITS_PER_BYTE, bits); > + KUNIT_EXPECT_KASAN_FAIL(test, > + kasan_int_result = > + test_bit(BITS_PER_LONG + BITS_PER_BYTE, bits)); > > #if defined(clear_bit_unlock_is_negative_byte) > - pr_info("out-of-bounds in clear_bit_unlock_is_negative_byte\n"); > - kasan_int_result = clear_bit_unlock_is_negative_byte(BITS_PER_LONG + > - BITS_PER_BYTE, bits); > + KUNIT_EXPECT_KASAN_FAIL(test, > + kasan_int_result = clear_bit_unlock_is_negative_byte( > + BITS_PER_LONG + BITS_PER_BYTE, bits)); > #endif > kfree(bits); > } > > -static noinline void __init kmalloc_double_kzfree(void) > +static void kmalloc_double_kzfree(struct kunit *test) > { > char *ptr; > size_t size = 16; > > - pr_info("double-free (kfree_sensitive)\n"); > ptr = kmalloc(size, GFP_KERNEL); > - if (!ptr) { > - pr_err("Allocation failed\n"); > - return; > - } > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); > > kfree_sensitive(ptr); > - kfree_sensitive(ptr); > + KUNIT_EXPECT_KASAN_FAIL(test, kfree_sensitive(ptr)); > } > > -#ifdef CONFIG_KASAN_VMALLOC > -static noinline void __init vmalloc_oob(void) > +static void vmalloc_oob(struct kunit *test) > { > void *area; > > - pr_info("vmalloc out-of-bounds\n"); > + if (!IS_ENABLED(CONFIG_KASAN_VMALLOC)) { > + kunit_info(test, "CONFIG_KASAN_VMALLOC is not enabled."); > + return; > + } > > /* > * We have to be careful not to hit the guard page. > * The MMU will catch that and crash us. > */ > area = vmalloc(3000); > - if (!area) { > - pr_err("Allocation failed\n"); > - return; > - } > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, area); > > - ((volatile char *)area)[3100]; > + KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)area)[3100]); > vfree(area); > } > -#else > -static void __init vmalloc_oob(void) {} > -#endif > - > -static struct kasan_rcu_info { > - int i; > - struct rcu_head rcu; > -} *global_rcu_ptr; > - > -static noinline void __init kasan_rcu_reclaim(struct rcu_head *rp) > -{ > - struct kasan_rcu_info *fp = container_of(rp, > - struct kasan_rcu_info, rcu); > - > - kfree(fp); > - fp->i = 1; > -} > - > -static noinline void __init kasan_rcu_uaf(void) > -{ > - struct kasan_rcu_info *ptr; > > - pr_info("use-after-free in kasan_rcu_reclaim\n"); > - ptr = kmalloc(sizeof(struct kasan_rcu_info), GFP_KERNEL); > - if (!ptr) { > - pr_err("Allocation failed\n"); > - return; > - } > - > - global_rcu_ptr = rcu_dereference_protected(ptr, NULL); > - call_rcu(&global_rcu_ptr->rcu, kasan_rcu_reclaim); > -} > - > -static int __init kmalloc_tests_init(void) > -{ > - /* > - * Temporarily enable multi-shot mode. Otherwise, we'd only get a > - * report for the first case. > - */ > - bool multishot = kasan_save_enable_multi_shot(); > - > - kmalloc_oob_right(); > - kmalloc_oob_left(); > - kmalloc_node_oob_right(); > -#ifdef CONFIG_SLUB > - kmalloc_pagealloc_oob_right(); > - kmalloc_pagealloc_uaf(); > - kmalloc_pagealloc_invalid_free(); > -#endif > - kmalloc_large_oob_right(); > - kmalloc_oob_krealloc_more(); > - kmalloc_oob_krealloc_less(); > - kmalloc_oob_16(); > - kmalloc_oob_in_memset(); > - kmalloc_oob_memset_2(); > - kmalloc_oob_memset_4(); > - kmalloc_oob_memset_8(); > - kmalloc_oob_memset_16(); > - kmalloc_memmove_invalid_size(); > - kmalloc_uaf(); > - kmalloc_uaf_memset(); > - kmalloc_uaf2(); > - kfree_via_page(); > - kfree_via_phys(); > - kmem_cache_oob(); > - memcg_accounted_kmem_cache(); > - kasan_stack_oob(); > - kasan_global_oob(); > - kasan_alloca_oob_left(); > - kasan_alloca_oob_right(); > - ksize_unpoisons_memory(); > - copy_user_test(); > - kmem_cache_double_free(); > - kmem_cache_invalid_free(); > - kasan_memchr(); > - kasan_memcmp(); > - kasan_strings(); > - kasan_bitops(); > - kmalloc_double_kzfree(); > - vmalloc_oob(); > - kasan_rcu_uaf(); > - > - kasan_restore_multi_shot(multishot); > - > - return -EAGAIN; > -} > +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(kmalloc_large_oob_right), > + KUNIT_CASE(kmalloc_oob_krealloc_more), > + KUNIT_CASE(kmalloc_oob_krealloc_less), > + KUNIT_CASE(kmalloc_oob_16), > + KUNIT_CASE(kmalloc_oob_in_memset), > + KUNIT_CASE(kmalloc_oob_memset_2), > + KUNIT_CASE(kmalloc_oob_memset_4), > + KUNIT_CASE(kmalloc_oob_memset_8), > + KUNIT_CASE(kmalloc_oob_memset_16), > + KUNIT_CASE(kmalloc_memmove_invalid_size), > + KUNIT_CASE(kmalloc_uaf), > + KUNIT_CASE(kmalloc_uaf_memset), > + KUNIT_CASE(kmalloc_uaf2), > + KUNIT_CASE(kfree_via_page), > + KUNIT_CASE(kfree_via_phys), > + KUNIT_CASE(kmem_cache_oob), > + KUNIT_CASE(memcg_accounted_kmem_cache), > + KUNIT_CASE(kasan_global_oob), > + KUNIT_CASE(kasan_stack_oob), > + KUNIT_CASE(kasan_alloca_oob_left), > + KUNIT_CASE(kasan_alloca_oob_right), > + KUNIT_CASE(ksize_unpoisons_memory), > + KUNIT_CASE(kmem_cache_double_free), > + KUNIT_CASE(kmem_cache_invalid_free), > + KUNIT_CASE(kasan_memchr), > + KUNIT_CASE(kasan_memcmp), > + KUNIT_CASE(kasan_strings), > + KUNIT_CASE(kasan_bitops), > + KUNIT_CASE(kmalloc_double_kzfree), > + KUNIT_CASE(vmalloc_oob), > + {} > +}; > + > +static struct kunit_suite kasan_kunit_test_suite = { > + .name = "kasan", > + .init = kasan_test_init, > + .test_cases = kasan_kunit_test_cases, > + .exit = kasan_test_exit, > +}; > + > +kunit_test_suite(kasan_kunit_test_suite); > > -module_init(kmalloc_tests_init); > MODULE_LICENSE("GPL"); > diff --git a/lib/test_kasan_module.c b/lib/test_kasan_module.c > new file mode 100644 > index 000000000000..2d68db6ae67b > --- /dev/null > +++ b/lib/test_kasan_module.c > @@ -0,0 +1,111 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* > + * > + * Copyright (c) 2014 Samsung Electronics Co., Ltd. > + * Author: Andrey Ryabinin <a.ryabinin@samsung.com> > + */ > + > +#define pr_fmt(fmt) "kasan test: %s " fmt, __func__ > + > +#include <linux/mman.h> > +#include <linux/module.h> > +#include <linux/printk.h> > +#include <linux/slab.h> > +#include <linux/uaccess.h> > + > +#include "../mm/kasan/kasan.h" > + > +#define OOB_TAG_OFF (IS_ENABLED(CONFIG_KASAN_GENERIC) ? 0 : KASAN_SHADOW_SCALE_SIZE) > + > +static noinline void __init copy_user_test(void) > +{ > + char *kmem; > + char __user *usermem; > + size_t size = 10; > + int unused; > + > + kmem = kmalloc(size, GFP_KERNEL); > + if (!kmem) > + return; > + > + usermem = (char __user *)vm_mmap(NULL, 0, PAGE_SIZE, > + PROT_READ | PROT_WRITE | PROT_EXEC, > + MAP_ANONYMOUS | MAP_PRIVATE, 0); > + if (IS_ERR(usermem)) { > + pr_err("Failed to allocate user memory\n"); > + kfree(kmem); > + return; > + } > + > + pr_info("out-of-bounds in copy_from_user()\n"); > + unused = copy_from_user(kmem, usermem, size + 1 + OOB_TAG_OFF); > + > + pr_info("out-of-bounds in copy_to_user()\n"); > + unused = copy_to_user(usermem, kmem, size + 1 + OOB_TAG_OFF); > + > + pr_info("out-of-bounds in __copy_from_user()\n"); > + unused = __copy_from_user(kmem, usermem, size + 1 + OOB_TAG_OFF); > + > + pr_info("out-of-bounds in __copy_to_user()\n"); > + unused = __copy_to_user(usermem, kmem, size + 1 + OOB_TAG_OFF); > + > + pr_info("out-of-bounds in __copy_from_user_inatomic()\n"); > + unused = __copy_from_user_inatomic(kmem, usermem, size + 1 + OOB_TAG_OFF); > + > + pr_info("out-of-bounds in __copy_to_user_inatomic()\n"); > + unused = __copy_to_user_inatomic(usermem, kmem, size + 1 + OOB_TAG_OFF); > + > + pr_info("out-of-bounds in strncpy_from_user()\n"); > + unused = strncpy_from_user(kmem, usermem, size + 1 + OOB_TAG_OFF); > + > + vm_munmap((unsigned long)usermem, PAGE_SIZE); > + kfree(kmem); > +} > + > +static struct kasan_rcu_info { > + int i; > + struct rcu_head rcu; > +} *global_rcu_ptr; > + > +static noinline void __init kasan_rcu_reclaim(struct rcu_head *rp) > +{ > + struct kasan_rcu_info *fp = container_of(rp, > + struct kasan_rcu_info, rcu); > + > + kfree(fp); > + fp->i = 1; > +} > + > +static noinline void __init kasan_rcu_uaf(void) > +{ > + struct kasan_rcu_info *ptr; > + > + pr_info("use-after-free in kasan_rcu_reclaim\n"); > + ptr = kmalloc(sizeof(struct kasan_rcu_info), GFP_KERNEL); > + if (!ptr) { > + pr_err("Allocation failed\n"); > + return; > + } > + > + global_rcu_ptr = rcu_dereference_protected(ptr, NULL); > + call_rcu(&global_rcu_ptr->rcu, kasan_rcu_reclaim); > +} > + > + > +static int __init test_kasan_module_init(void) > +{ > + /* > + * Temporarily enable multi-shot mode. Otherwise, we'd only get a > + * report for the first case. > + */ > + bool multishot = kasan_save_enable_multi_shot(); > + > + copy_user_test(); > + kasan_rcu_uaf(); > + > + kasan_restore_multi_shot(multishot); > + return -EAGAIN; > +} > + > +module_init(test_kasan_module_init); > +MODULE_LICENSE("GPL"); > -- > 2.28.0.163.g6104cc2f0b6-goog >
diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan index 047b53dbfd58..9a237887e52e 100644 --- a/lib/Kconfig.kasan +++ b/lib/Kconfig.kasan @@ -167,12 +167,24 @@ config KASAN_VMALLOC for KASAN to detect more sorts of errors (and to support vmapped stacks), but at the cost of higher memory usage. -config TEST_KASAN - tristate "Module for testing KASAN for bug detection" - depends on m +config KASAN_KUNIT_TEST + tristate "KUnit-compatible tests of KASAN bug detection capabilities" if !KUNIT_ALL_TESTS + depends on KASAN && KUNIT + default KUNIT_ALL_TESTS help - This is a test module doing various nasty things like - out of bounds accesses, use after free. It is useful for testing + This is a KUnit test suite doing various nasty things like + out of bounds and use after free accesses. It is useful for testing kernel debugging features like KASAN. + For more information on KUnit and unit tests in general, please refer + to the KUnit documentation in Documentation/dev-tools/kunit + +config TEST_KASAN_MODULE + tristate "KUnit-incompatible tests of KASAN bug detection capabilities" + depends on m && KASAN + help + This is a part of the KASAN test suite that is incompatible with + KUnit. Currently includes tests that do bad copy_from/to_user + accesses. + endif # KASAN diff --git a/lib/Makefile b/lib/Makefile index 46278be53cda..adaebfac81c9 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -60,9 +60,10 @@ CFLAGS_test_bitops.o += -Werror obj-$(CONFIG_TEST_SYSCTL) += test_sysctl.o obj-$(CONFIG_TEST_HASH) += test_hash.o test_siphash.o obj-$(CONFIG_TEST_IDA) += test_ida.o -obj-$(CONFIG_TEST_KASAN) += test_kasan.o +obj-$(CONFIG_KASAN_KUNIT_TEST) += test_kasan.o CFLAGS_test_kasan.o += -fno-builtin CFLAGS_test_kasan.o += $(call cc-disable-warning, vla) +obj-$(CONFIG_TEST_KASAN_MODULE) += test_kasan_module.o obj-$(CONFIG_TEST_UBSAN) += test_ubsan.o CFLAGS_test_ubsan.o += $(call cc-disable-warning, vla) UBSAN_SANITIZE_test_ubsan.o := y diff --git a/lib/test_kasan.c b/lib/test_kasan.c index 58bffadd8367..d023fb75fd60 100644 --- a/lib/test_kasan.c +++ b/lib/test_kasan.c @@ -5,8 +5,6 @@ * Author: Andrey Ryabinin <a.ryabinin@samsung.com> */ -#define pr_fmt(fmt) "kasan test: %s " fmt, __func__ - #include <linux/bitops.h> #include <linux/delay.h> #include <linux/kasan.h> @@ -77,416 +75,327 @@ static void kasan_test_exit(struct kunit *test) fail_data.report_found); \ } while (0) - - -/* - * Note: test functions are marked noinline so that their names appear in - * reports. - */ -static noinline void __init kmalloc_oob_right(void) +static void kmalloc_oob_right(struct kunit *test) { char *ptr; size_t size = 123; - pr_info("out-of-bounds to right\n"); ptr = kmalloc(size, GFP_KERNEL); - if (!ptr) { - pr_err("Allocation failed\n"); - return; - } - - ptr[size + OOB_TAG_OFF] = 'x'; + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); + KUNIT_EXPECT_KASAN_FAIL(test, ptr[size + OOB_TAG_OFF] = 'x'); kfree(ptr); } -static noinline void __init kmalloc_oob_left(void) +static void kmalloc_oob_left(struct kunit *test) { char *ptr; size_t size = 15; - pr_info("out-of-bounds to left\n"); ptr = kmalloc(size, GFP_KERNEL); - if (!ptr) { - pr_err("Allocation failed\n"); - return; - } + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); - *ptr = *(ptr - 1); + KUNIT_EXPECT_KASAN_FAIL(test, *ptr = *(ptr - 1)); kfree(ptr); } -static noinline void __init kmalloc_node_oob_right(void) +static void kmalloc_node_oob_right(struct kunit *test) { char *ptr; size_t size = 4096; - pr_info("kmalloc_node(): out-of-bounds to right\n"); ptr = kmalloc_node(size, GFP_KERNEL, 0); - if (!ptr) { - pr_err("Allocation failed\n"); - return; - } + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); - ptr[size] = 0; + KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 0); kfree(ptr); } -#ifdef CONFIG_SLUB -static noinline void __init kmalloc_pagealloc_oob_right(void) +static void kmalloc_pagealloc_oob_right(struct kunit *test) { char *ptr; size_t size = KMALLOC_MAX_CACHE_SIZE + 10; + if (!IS_ENABLED(CONFIG_SLUB)) { + kunit_info(test, "CONFIG_SLUB is not enabled."); + return; + } + /* Allocate a chunk that does not fit into a SLUB cache to trigger * the page allocator fallback. */ - pr_info("kmalloc pagealloc allocation: out-of-bounds to right\n"); ptr = kmalloc(size, GFP_KERNEL); - if (!ptr) { - pr_err("Allocation failed\n"); - return; - } - - ptr[size + OOB_TAG_OFF] = 0; + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); + KUNIT_EXPECT_KASAN_FAIL(test, ptr[size + OOB_TAG_OFF] = 0); kfree(ptr); } -static noinline void __init kmalloc_pagealloc_uaf(void) +static void kmalloc_pagealloc_uaf(struct kunit *test) { char *ptr; size_t size = KMALLOC_MAX_CACHE_SIZE + 10; - pr_info("kmalloc pagealloc allocation: use-after-free\n"); - ptr = kmalloc(size, GFP_KERNEL); - if (!ptr) { - pr_err("Allocation failed\n"); + if (!IS_ENABLED(CONFIG_SLUB)) { + kunit_info(test, "CONFIG_SLUB is not enabled."); return; } + ptr = kmalloc(size, GFP_KERNEL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); + kfree(ptr); - ptr[0] = 0; + KUNIT_EXPECT_KASAN_FAIL(test, ptr[0] = 0); } -static noinline void __init kmalloc_pagealloc_invalid_free(void) +static void kmalloc_pagealloc_invalid_free(struct kunit *test) { char *ptr; size_t size = KMALLOC_MAX_CACHE_SIZE + 10; - pr_info("kmalloc pagealloc allocation: invalid-free\n"); - ptr = kmalloc(size, GFP_KERNEL); - if (!ptr) { - pr_err("Allocation failed\n"); + if (!IS_ENABLED(CONFIG_SLUB)) { + kunit_info(test, "CONFIG_SLUB is not enabled."); return; } - kfree(ptr + 1); + ptr = kmalloc(size, GFP_KERNEL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); + + KUNIT_EXPECT_KASAN_FAIL(test, kfree(ptr + 1)); } -#endif -static noinline void __init kmalloc_large_oob_right(void) +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. */ - pr_info("kmalloc large allocation: out-of-bounds to right\n"); ptr = kmalloc(size, GFP_KERNEL); - if (!ptr) { - pr_err("Allocation failed\n"); - return; - } + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); - ptr[size] = 0; + KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 0); kfree(ptr); } -static noinline void __init kmalloc_oob_krealloc_more(void) +static void kmalloc_oob_krealloc_more(struct kunit *test) { char *ptr1, *ptr2; size_t size1 = 17; size_t size2 = 19; - pr_info("out-of-bounds after krealloc more\n"); ptr1 = kmalloc(size1, GFP_KERNEL); - ptr2 = krealloc(ptr1, size2, GFP_KERNEL); - if (!ptr1 || !ptr2) { - pr_err("Allocation failed\n"); - kfree(ptr1); - kfree(ptr2); - return; - } + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); - ptr2[size2 + OOB_TAG_OFF] = 'x'; + ptr2 = krealloc(ptr1, size2, GFP_KERNEL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2); + KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size2 + OOB_TAG_OFF] = 'x'); kfree(ptr2); } -static noinline void __init kmalloc_oob_krealloc_less(void) +static void kmalloc_oob_krealloc_less(struct kunit *test) { char *ptr1, *ptr2; size_t size1 = 17; size_t size2 = 15; - pr_info("out-of-bounds after krealloc less\n"); ptr1 = kmalloc(size1, GFP_KERNEL); - ptr2 = krealloc(ptr1, size2, GFP_KERNEL); - if (!ptr1 || !ptr2) { - pr_err("Allocation failed\n"); - kfree(ptr1); - return; - } + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); - ptr2[size2 + OOB_TAG_OFF] = 'x'; + ptr2 = krealloc(ptr1, size2, GFP_KERNEL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2); + KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size2 + OOB_TAG_OFF] = 'x'); kfree(ptr2); } -static noinline void __init kmalloc_oob_16(void) +static void kmalloc_oob_16(struct kunit *test) { struct { u64 words[2]; } *ptr1, *ptr2; - pr_info("kmalloc out-of-bounds for 16-bytes access\n"); ptr1 = kmalloc(sizeof(*ptr1) - 3, GFP_KERNEL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); + ptr2 = kmalloc(sizeof(*ptr2), GFP_KERNEL); - if (!ptr1 || !ptr2) { - pr_err("Allocation failed\n"); - kfree(ptr1); - kfree(ptr2); - return; - } - *ptr1 = *ptr2; + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2); + + KUNIT_EXPECT_KASAN_FAIL(test, *ptr1 = *ptr2); kfree(ptr1); kfree(ptr2); } -static noinline void __init kmalloc_oob_memset_2(void) +static void kmalloc_oob_memset_2(struct kunit *test) { char *ptr; size_t size = 8; - pr_info("out-of-bounds in memset2\n"); ptr = kmalloc(size, GFP_KERNEL); - if (!ptr) { - pr_err("Allocation failed\n"); - return; - } - - memset(ptr + 7 + OOB_TAG_OFF, 0, 2); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); + KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + 7 + OOB_TAG_OFF, 0, 2)); kfree(ptr); } -static noinline void __init kmalloc_oob_memset_4(void) +static void kmalloc_oob_memset_4(struct kunit *test) { char *ptr; size_t size = 8; - pr_info("out-of-bounds in memset4\n"); ptr = kmalloc(size, GFP_KERNEL); - if (!ptr) { - pr_err("Allocation failed\n"); - return; - } - - memset(ptr + 5 + OOB_TAG_OFF, 0, 4); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); + KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + 5 + OOB_TAG_OFF, 0, 4)); kfree(ptr); } -static noinline void __init kmalloc_oob_memset_8(void) +static void kmalloc_oob_memset_8(struct kunit *test) { char *ptr; size_t size = 8; - pr_info("out-of-bounds in memset8\n"); ptr = kmalloc(size, GFP_KERNEL); - if (!ptr) { - pr_err("Allocation failed\n"); - return; - } - - memset(ptr + 1 + OOB_TAG_OFF, 0, 8); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); + KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + 1 + OOB_TAG_OFF, 0, 8)); kfree(ptr); } -static noinline void __init kmalloc_oob_memset_16(void) +static void kmalloc_oob_memset_16(struct kunit *test) { char *ptr; size_t size = 16; - pr_info("out-of-bounds in memset16\n"); ptr = kmalloc(size, GFP_KERNEL); - if (!ptr) { - pr_err("Allocation failed\n"); - return; - } - - memset(ptr + 1 + OOB_TAG_OFF, 0, 16); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); + KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + 1 + OOB_TAG_OFF, 0, 16)); kfree(ptr); } -static noinline void __init kmalloc_oob_in_memset(void) +static void kmalloc_oob_in_memset(struct kunit *test) { char *ptr; size_t size = 666; - pr_info("out-of-bounds in memset\n"); ptr = kmalloc(size, GFP_KERNEL); - if (!ptr) { - pr_err("Allocation failed\n"); - return; - } - - memset(ptr, 0, size + 5 + OOB_TAG_OFF); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); + KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr, 0, size + 5 + OOB_TAG_OFF)); kfree(ptr); } -static noinline void __init kmalloc_memmove_invalid_size(void) +static void kmalloc_memmove_invalid_size(struct kunit *test) { char *ptr; size_t size = 64; volatile size_t invalid_size = -2; - pr_info("invalid size in memmove\n"); ptr = kmalloc(size, GFP_KERNEL); - if (!ptr) { - pr_err("Allocation failed\n"); - return; - } + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); memset((char *)ptr, 0, 64); - memmove((char *)ptr, (char *)ptr + 4, invalid_size); + + KUNIT_EXPECT_KASAN_FAIL(test, + memmove((char *)ptr, (char *)ptr + 4, invalid_size)); kfree(ptr); } -static noinline void __init kmalloc_uaf(void) +static void kmalloc_uaf(struct kunit *test) { char *ptr; size_t size = 10; - pr_info("use-after-free\n"); ptr = kmalloc(size, GFP_KERNEL); - if (!ptr) { - pr_err("Allocation failed\n"); - return; - } + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); kfree(ptr); - *(ptr + 8) = 'x'; + KUNIT_EXPECT_KASAN_FAIL(test, *(ptr + 8) = 'x'); } -static noinline void __init kmalloc_uaf_memset(void) +static void kmalloc_uaf_memset(struct kunit *test) { char *ptr; size_t size = 33; - pr_info("use-after-free in memset\n"); ptr = kmalloc(size, GFP_KERNEL); - if (!ptr) { - pr_err("Allocation failed\n"); - return; - } + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); kfree(ptr); - memset(ptr, 0, size); + KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr, 0, size)); } -static noinline void __init kmalloc_uaf2(void) +static void kmalloc_uaf2(struct kunit *test) { char *ptr1, *ptr2; size_t size = 43; - pr_info("use-after-free after another kmalloc\n"); ptr1 = kmalloc(size, GFP_KERNEL); - if (!ptr1) { - pr_err("Allocation failed\n"); - return; - } + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); kfree(ptr1); + ptr2 = kmalloc(size, GFP_KERNEL); - if (!ptr2) { - pr_err("Allocation failed\n"); - return; - } + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2); + + KUNIT_EXPECT_KASAN_FAIL(test, ptr1[40] = 'x'); + KUNIT_EXPECT_PTR_NE(test, ptr1, ptr2); - ptr1[40] = 'x'; - if (ptr1 == ptr2) - pr_err("Could not detect use-after-free: ptr1 == ptr2\n"); kfree(ptr2); } -static noinline void __init kfree_via_page(void) +static void kfree_via_page(struct kunit *test) { char *ptr; size_t size = 8; struct page *page; unsigned long offset; - pr_info("invalid-free false positive (via page)\n"); ptr = kmalloc(size, GFP_KERNEL); - if (!ptr) { - pr_err("Allocation failed\n"); - return; - } + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); page = virt_to_page(ptr); offset = offset_in_page(ptr); kfree(page_address(page) + offset); } -static noinline void __init kfree_via_phys(void) +static void kfree_via_phys(struct kunit *test) { char *ptr; size_t size = 8; phys_addr_t phys; - pr_info("invalid-free false positive (via phys)\n"); ptr = kmalloc(size, GFP_KERNEL); - if (!ptr) { - pr_err("Allocation failed\n"); - return; - } + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); phys = virt_to_phys(ptr); kfree(phys_to_virt(phys)); } -static noinline void __init kmem_cache_oob(void) +static void kmem_cache_oob(struct kunit *test) { char *p; size_t size = 200; struct kmem_cache *cache = kmem_cache_create("test_cache", size, 0, 0, NULL); - if (!cache) { - pr_err("Cache allocation failed\n"); - return; - } - pr_info("out-of-bounds in kmem_cache_alloc\n"); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); p = kmem_cache_alloc(cache, GFP_KERNEL); if (!p) { - pr_err("Allocation failed\n"); + kunit_err(test, "Allocation failed: %s\n", __func__); kmem_cache_destroy(cache); return; } - *p = p[size + OOB_TAG_OFF]; - + KUNIT_EXPECT_KASAN_FAIL(test, *p = p[size + OOB_TAG_OFF]); kmem_cache_free(cache, p); kmem_cache_destroy(cache); } -static noinline void __init memcg_accounted_kmem_cache(void) +static void memcg_accounted_kmem_cache(struct kunit *test) { int i; char *p; @@ -494,12 +403,8 @@ static noinline void __init memcg_accounted_kmem_cache(void) struct kmem_cache *cache; cache = kmem_cache_create("test_cache", size, 0, SLAB_ACCOUNT, NULL); - if (!cache) { - pr_err("Cache allocation failed\n"); - return; - } + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); - pr_info("allocate memcg accounted object\n"); /* * Several allocations with a delay to allow for lazy per memcg kmem * cache creation. @@ -519,134 +424,93 @@ static noinline void __init memcg_accounted_kmem_cache(void) static char global_array[10]; -static noinline void __init kasan_global_oob(void) +static void kasan_global_oob(struct kunit *test) { volatile int i = 3; char *p = &global_array[ARRAY_SIZE(global_array) + i]; - pr_info("out-of-bounds global variable\n"); - *(volatile char *)p; -} - -static noinline void __init kasan_stack_oob(void) -{ - char stack_array[10]; - volatile int i = OOB_TAG_OFF; - char *p = &stack_array[ARRAY_SIZE(stack_array) + i]; - - pr_info("out-of-bounds on stack\n"); - *(volatile char *)p; + KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p); } -static noinline void __init ksize_unpoisons_memory(void) +static void ksize_unpoisons_memory(struct kunit *test) { char *ptr; size_t size = 123, real_size; - pr_info("ksize() unpoisons the whole allocated chunk\n"); ptr = kmalloc(size, GFP_KERNEL); - if (!ptr) { - pr_err("Allocation failed\n"); - return; - } + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); real_size = ksize(ptr); /* This access doesn't trigger an error. */ ptr[size] = 'x'; /* This one does. */ - ptr[real_size] = 'y'; + KUNIT_EXPECT_KASAN_FAIL(test, ptr[real_size] = 'y'); kfree(ptr); } -static noinline void __init copy_user_test(void) +static void kasan_stack_oob(struct kunit *test) { - char *kmem; - char __user *usermem; - size_t size = 10; - int unused; - - kmem = kmalloc(size, GFP_KERNEL); - if (!kmem) - return; + char stack_array[10]; + volatile int i = OOB_TAG_OFF; + char *p = &stack_array[ARRAY_SIZE(stack_array) + i]; - usermem = (char __user *)vm_mmap(NULL, 0, PAGE_SIZE, - PROT_READ | PROT_WRITE | PROT_EXEC, - MAP_ANONYMOUS | MAP_PRIVATE, 0); - if (IS_ERR(usermem)) { - pr_err("Failed to allocate user memory\n"); - kfree(kmem); + if (!IS_ENABLED(CONFIG_KASAN_STACK)) { + kunit_info(test, "CONFIG_KASAN_STACK is not enabled"); return; } - pr_info("out-of-bounds in copy_from_user()\n"); - unused = copy_from_user(kmem, usermem, size + 1 + OOB_TAG_OFF); - - pr_info("out-of-bounds in copy_to_user()\n"); - unused = copy_to_user(usermem, kmem, size + 1 + OOB_TAG_OFF); - - pr_info("out-of-bounds in __copy_from_user()\n"); - unused = __copy_from_user(kmem, usermem, size + 1 + OOB_TAG_OFF); - - pr_info("out-of-bounds in __copy_to_user()\n"); - unused = __copy_to_user(usermem, kmem, size + 1 + OOB_TAG_OFF); - - pr_info("out-of-bounds in __copy_from_user_inatomic()\n"); - unused = __copy_from_user_inatomic(kmem, usermem, size + 1 + OOB_TAG_OFF); - - pr_info("out-of-bounds in __copy_to_user_inatomic()\n"); - unused = __copy_to_user_inatomic(usermem, kmem, size + 1 + OOB_TAG_OFF); - - pr_info("out-of-bounds in strncpy_from_user()\n"); - unused = strncpy_from_user(kmem, usermem, size + 1 + OOB_TAG_OFF); - - vm_munmap((unsigned long)usermem, PAGE_SIZE); - kfree(kmem); + KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p); } -static noinline void __init kasan_alloca_oob_left(void) +static void kasan_alloca_oob_left(struct kunit *test) { volatile int i = 10; char alloca_array[i]; char *p = alloca_array - 1; - pr_info("out-of-bounds to left on alloca\n"); - *(volatile char *)p; + if (!IS_ENABLED(CONFIG_KASAN_STACK)) { + kunit_info(test, "CONFIG_KASAN_STACK is not enabled"); + return; + } + + KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p); } -static noinline void __init kasan_alloca_oob_right(void) +static void kasan_alloca_oob_right(struct kunit *test) { volatile int i = 10; char alloca_array[i]; char *p = alloca_array + i; - pr_info("out-of-bounds to right on alloca\n"); - *(volatile char *)p; + if (!IS_ENABLED(CONFIG_KASAN_STACK)) { + kunit_info(test, "CONFIG_KASAN_STACK is not enabled"); + return; + } + + KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p); } -static noinline void __init kmem_cache_double_free(void) +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); - if (!cache) { - pr_err("Cache allocation failed\n"); - return; - } - pr_info("double-free on heap object\n"); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); + p = kmem_cache_alloc(cache, GFP_KERNEL); if (!p) { - pr_err("Allocation failed\n"); + kunit_err(test, "Allocation failed: %s\n", __func__); kmem_cache_destroy(cache); return; } kmem_cache_free(cache, p); - kmem_cache_free(cache, p); + KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_free(cache, p)); kmem_cache_destroy(cache); } -static noinline void __init kmem_cache_invalid_free(void) +static void kmem_cache_invalid_free(struct kunit *test) { char *p; size_t size = 200; @@ -654,20 +518,17 @@ static noinline void __init kmem_cache_invalid_free(void) cache = kmem_cache_create("test_cache", size, 0, SLAB_TYPESAFE_BY_RCU, NULL); - if (!cache) { - pr_err("Cache allocation failed\n"); - return; - } - pr_info("invalid-free of heap object\n"); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); + p = kmem_cache_alloc(cache, GFP_KERNEL); if (!p) { - pr_err("Allocation failed\n"); + kunit_err(test, "Allocation failed: %s\n", __func__); kmem_cache_destroy(cache); return; } /* Trigger invalid free, the object doesn't get freed */ - kmem_cache_free(cache, p + 1); + KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_free(cache, p + 1)); /* * Properly free the object to prevent the "Objects remaining in @@ -678,45 +539,64 @@ static noinline void __init kmem_cache_invalid_free(void) kmem_cache_destroy(cache); } -static noinline void __init kasan_memchr(void) +static void kasan_memchr(struct kunit *test) { char *ptr; size_t size = 24; - pr_info("out-of-bounds in memchr\n"); - ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO); - if (!ptr) + /* See https://bugzilla.kernel.org/show_bug.cgi?id=206337 */ + if (IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT)) { + kunit_info(test, + "str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT"); return; + } + + ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); + + KUNIT_EXPECT_KASAN_FAIL(test, + kasan_ptr_result = memchr(ptr, '1', size + 1)); kasan_ptr_result = memchr(ptr, '1', size + 1); kfree(ptr); } -static noinline void __init kasan_memcmp(void) +static void kasan_memcmp(struct kunit *test) { char *ptr; size_t size = 24; int arr[9]; - pr_info("out-of-bounds in memcmp\n"); - ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO); - if (!ptr) + /* See https://bugzilla.kernel.org/show_bug.cgi?id=206337 */ + if (IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT)) { + kunit_info(test, + "str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT"); return; + } + ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); memset(arr, 0, sizeof(arr)); - kasan_int_result = memcmp(ptr, arr, size + 1); + + KUNIT_EXPECT_KASAN_FAIL(test, + kasan_int_result = memcmp(ptr, arr, size+1)); kfree(ptr); } -static noinline void __init kasan_strings(void) +static void kasan_strings(struct kunit *test) { char *ptr; size_t size = 24; - pr_info("use-after-free in strchr\n"); - ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO); - if (!ptr) + /* See https://bugzilla.kernel.org/show_bug.cgi?id=206337 */ + if (IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT)) { + kunit_info(test, + "str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT"); return; + } + + ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); kfree(ptr); @@ -727,220 +607,164 @@ static noinline void __init kasan_strings(void) * will likely point to zeroed byte. */ ptr += 16; - kasan_ptr_result = strchr(ptr, '1'); + KUNIT_EXPECT_KASAN_FAIL(test, kasan_ptr_result = strchr(ptr, '1')); - pr_info("use-after-free in strrchr\n"); - kasan_ptr_result = strrchr(ptr, '1'); + KUNIT_EXPECT_KASAN_FAIL(test, kasan_ptr_result = strrchr(ptr, '1')); - pr_info("use-after-free in strcmp\n"); - kasan_int_result = strcmp(ptr, "2"); + KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strcmp(ptr, "2")); - pr_info("use-after-free in strncmp\n"); - kasan_int_result = strncmp(ptr, "2", 1); + KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strncmp(ptr, "2", 1)); - pr_info("use-after-free in strlen\n"); - kasan_int_result = strlen(ptr); + KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strlen(ptr)); - pr_info("use-after-free in strnlen\n"); - kasan_int_result = strnlen(ptr, 1); + KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strnlen(ptr, 1)); } -static noinline void __init kasan_bitops(void) +static void kasan_bitops(struct kunit *test) { /* * Allocate 1 more byte, which causes kzalloc to round up to 16-bytes; * this way we do not actually corrupt other memory. */ long *bits = kzalloc(sizeof(*bits) + 1, GFP_KERNEL); - if (!bits) - return; + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, bits); /* * Below calls try to access bit within allocated memory; however, the * below accesses are still out-of-bounds, since bitops are defined to * operate on the whole long the bit is in. */ - pr_info("out-of-bounds in set_bit\n"); - set_bit(BITS_PER_LONG, bits); + KUNIT_EXPECT_KASAN_FAIL(test, set_bit(BITS_PER_LONG, bits)); - pr_info("out-of-bounds in __set_bit\n"); - __set_bit(BITS_PER_LONG, bits); + KUNIT_EXPECT_KASAN_FAIL(test, __set_bit(BITS_PER_LONG, bits)); - pr_info("out-of-bounds in clear_bit\n"); - clear_bit(BITS_PER_LONG, bits); + KUNIT_EXPECT_KASAN_FAIL(test, clear_bit(BITS_PER_LONG, bits)); - pr_info("out-of-bounds in __clear_bit\n"); - __clear_bit(BITS_PER_LONG, bits); + KUNIT_EXPECT_KASAN_FAIL(test, __clear_bit(BITS_PER_LONG, bits)); - pr_info("out-of-bounds in clear_bit_unlock\n"); - clear_bit_unlock(BITS_PER_LONG, bits); + KUNIT_EXPECT_KASAN_FAIL(test, clear_bit_unlock(BITS_PER_LONG, bits)); - pr_info("out-of-bounds in __clear_bit_unlock\n"); - __clear_bit_unlock(BITS_PER_LONG, bits); + KUNIT_EXPECT_KASAN_FAIL(test, __clear_bit_unlock(BITS_PER_LONG, bits)); - pr_info("out-of-bounds in change_bit\n"); - change_bit(BITS_PER_LONG, bits); + KUNIT_EXPECT_KASAN_FAIL(test, change_bit(BITS_PER_LONG, bits)); - pr_info("out-of-bounds in __change_bit\n"); - __change_bit(BITS_PER_LONG, bits); + KUNIT_EXPECT_KASAN_FAIL(test, __change_bit(BITS_PER_LONG, bits)); /* * Below calls try to access bit beyond allocated memory. */ - pr_info("out-of-bounds in test_and_set_bit\n"); - test_and_set_bit(BITS_PER_LONG + BITS_PER_BYTE, bits); + KUNIT_EXPECT_KASAN_FAIL(test, + test_and_set_bit(BITS_PER_LONG + BITS_PER_BYTE, bits)); - pr_info("out-of-bounds in __test_and_set_bit\n"); - __test_and_set_bit(BITS_PER_LONG + BITS_PER_BYTE, bits); + KUNIT_EXPECT_KASAN_FAIL(test, + __test_and_set_bit(BITS_PER_LONG + BITS_PER_BYTE, bits)); - pr_info("out-of-bounds in test_and_set_bit_lock\n"); - test_and_set_bit_lock(BITS_PER_LONG + BITS_PER_BYTE, bits); + KUNIT_EXPECT_KASAN_FAIL(test, + test_and_set_bit_lock(BITS_PER_LONG + BITS_PER_BYTE, bits)); - pr_info("out-of-bounds in test_and_clear_bit\n"); - test_and_clear_bit(BITS_PER_LONG + BITS_PER_BYTE, bits); + KUNIT_EXPECT_KASAN_FAIL(test, + test_and_clear_bit(BITS_PER_LONG + BITS_PER_BYTE, bits)); - pr_info("out-of-bounds in __test_and_clear_bit\n"); - __test_and_clear_bit(BITS_PER_LONG + BITS_PER_BYTE, bits); + KUNIT_EXPECT_KASAN_FAIL(test, + __test_and_clear_bit(BITS_PER_LONG + BITS_PER_BYTE, bits)); - pr_info("out-of-bounds in test_and_change_bit\n"); - test_and_change_bit(BITS_PER_LONG + BITS_PER_BYTE, bits); + KUNIT_EXPECT_KASAN_FAIL(test, + test_and_change_bit(BITS_PER_LONG + BITS_PER_BYTE, bits)); - pr_info("out-of-bounds in __test_and_change_bit\n"); - __test_and_change_bit(BITS_PER_LONG + BITS_PER_BYTE, bits); + KUNIT_EXPECT_KASAN_FAIL(test, + __test_and_change_bit(BITS_PER_LONG + BITS_PER_BYTE, bits)); - pr_info("out-of-bounds in test_bit\n"); - kasan_int_result = test_bit(BITS_PER_LONG + BITS_PER_BYTE, bits); + KUNIT_EXPECT_KASAN_FAIL(test, + kasan_int_result = + test_bit(BITS_PER_LONG + BITS_PER_BYTE, bits)); #if defined(clear_bit_unlock_is_negative_byte) - pr_info("out-of-bounds in clear_bit_unlock_is_negative_byte\n"); - kasan_int_result = clear_bit_unlock_is_negative_byte(BITS_PER_LONG + - BITS_PER_BYTE, bits); + KUNIT_EXPECT_KASAN_FAIL(test, + kasan_int_result = clear_bit_unlock_is_negative_byte( + BITS_PER_LONG + BITS_PER_BYTE, bits)); #endif kfree(bits); } -static noinline void __init kmalloc_double_kzfree(void) +static void kmalloc_double_kzfree(struct kunit *test) { char *ptr; size_t size = 16; - pr_info("double-free (kfree_sensitive)\n"); ptr = kmalloc(size, GFP_KERNEL); - if (!ptr) { - pr_err("Allocation failed\n"); - return; - } + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); kfree_sensitive(ptr); - kfree_sensitive(ptr); + KUNIT_EXPECT_KASAN_FAIL(test, kfree_sensitive(ptr)); } -#ifdef CONFIG_KASAN_VMALLOC -static noinline void __init vmalloc_oob(void) +static void vmalloc_oob(struct kunit *test) { void *area; - pr_info("vmalloc out-of-bounds\n"); + if (!IS_ENABLED(CONFIG_KASAN_VMALLOC)) { + kunit_info(test, "CONFIG_KASAN_VMALLOC is not enabled."); + return; + } /* * We have to be careful not to hit the guard page. * The MMU will catch that and crash us. */ area = vmalloc(3000); - if (!area) { - pr_err("Allocation failed\n"); - return; - } + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, area); - ((volatile char *)area)[3100]; + KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)area)[3100]); vfree(area); } -#else -static void __init vmalloc_oob(void) {} -#endif - -static struct kasan_rcu_info { - int i; - struct rcu_head rcu; -} *global_rcu_ptr; - -static noinline void __init kasan_rcu_reclaim(struct rcu_head *rp) -{ - struct kasan_rcu_info *fp = container_of(rp, - struct kasan_rcu_info, rcu); - - kfree(fp); - fp->i = 1; -} - -static noinline void __init kasan_rcu_uaf(void) -{ - struct kasan_rcu_info *ptr; - pr_info("use-after-free in kasan_rcu_reclaim\n"); - ptr = kmalloc(sizeof(struct kasan_rcu_info), GFP_KERNEL); - if (!ptr) { - pr_err("Allocation failed\n"); - return; - } - - global_rcu_ptr = rcu_dereference_protected(ptr, NULL); - call_rcu(&global_rcu_ptr->rcu, kasan_rcu_reclaim); -} - -static int __init kmalloc_tests_init(void) -{ - /* - * Temporarily enable multi-shot mode. Otherwise, we'd only get a - * report for the first case. - */ - bool multishot = kasan_save_enable_multi_shot(); - - kmalloc_oob_right(); - kmalloc_oob_left(); - kmalloc_node_oob_right(); -#ifdef CONFIG_SLUB - kmalloc_pagealloc_oob_right(); - kmalloc_pagealloc_uaf(); - kmalloc_pagealloc_invalid_free(); -#endif - kmalloc_large_oob_right(); - kmalloc_oob_krealloc_more(); - kmalloc_oob_krealloc_less(); - kmalloc_oob_16(); - kmalloc_oob_in_memset(); - kmalloc_oob_memset_2(); - kmalloc_oob_memset_4(); - kmalloc_oob_memset_8(); - kmalloc_oob_memset_16(); - kmalloc_memmove_invalid_size(); - kmalloc_uaf(); - kmalloc_uaf_memset(); - kmalloc_uaf2(); - kfree_via_page(); - kfree_via_phys(); - kmem_cache_oob(); - memcg_accounted_kmem_cache(); - kasan_stack_oob(); - kasan_global_oob(); - kasan_alloca_oob_left(); - kasan_alloca_oob_right(); - ksize_unpoisons_memory(); - copy_user_test(); - kmem_cache_double_free(); - kmem_cache_invalid_free(); - kasan_memchr(); - kasan_memcmp(); - kasan_strings(); - kasan_bitops(); - kmalloc_double_kzfree(); - vmalloc_oob(); - kasan_rcu_uaf(); - - kasan_restore_multi_shot(multishot); - - return -EAGAIN; -} +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(kmalloc_large_oob_right), + KUNIT_CASE(kmalloc_oob_krealloc_more), + KUNIT_CASE(kmalloc_oob_krealloc_less), + KUNIT_CASE(kmalloc_oob_16), + KUNIT_CASE(kmalloc_oob_in_memset), + KUNIT_CASE(kmalloc_oob_memset_2), + KUNIT_CASE(kmalloc_oob_memset_4), + KUNIT_CASE(kmalloc_oob_memset_8), + KUNIT_CASE(kmalloc_oob_memset_16), + KUNIT_CASE(kmalloc_memmove_invalid_size), + KUNIT_CASE(kmalloc_uaf), + KUNIT_CASE(kmalloc_uaf_memset), + KUNIT_CASE(kmalloc_uaf2), + KUNIT_CASE(kfree_via_page), + KUNIT_CASE(kfree_via_phys), + KUNIT_CASE(kmem_cache_oob), + KUNIT_CASE(memcg_accounted_kmem_cache), + KUNIT_CASE(kasan_global_oob), + KUNIT_CASE(kasan_stack_oob), + KUNIT_CASE(kasan_alloca_oob_left), + KUNIT_CASE(kasan_alloca_oob_right), + KUNIT_CASE(ksize_unpoisons_memory), + KUNIT_CASE(kmem_cache_double_free), + KUNIT_CASE(kmem_cache_invalid_free), + KUNIT_CASE(kasan_memchr), + KUNIT_CASE(kasan_memcmp), + KUNIT_CASE(kasan_strings), + KUNIT_CASE(kasan_bitops), + KUNIT_CASE(kmalloc_double_kzfree), + KUNIT_CASE(vmalloc_oob), + {} +}; + +static struct kunit_suite kasan_kunit_test_suite = { + .name = "kasan", + .init = kasan_test_init, + .test_cases = kasan_kunit_test_cases, + .exit = kasan_test_exit, +}; + +kunit_test_suite(kasan_kunit_test_suite); -module_init(kmalloc_tests_init); MODULE_LICENSE("GPL"); diff --git a/lib/test_kasan_module.c b/lib/test_kasan_module.c new file mode 100644 index 000000000000..2d68db6ae67b --- /dev/null +++ b/lib/test_kasan_module.c @@ -0,0 +1,111 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * + * Copyright (c) 2014 Samsung Electronics Co., Ltd. + * Author: Andrey Ryabinin <a.ryabinin@samsung.com> + */ + +#define pr_fmt(fmt) "kasan test: %s " fmt, __func__ + +#include <linux/mman.h> +#include <linux/module.h> +#include <linux/printk.h> +#include <linux/slab.h> +#include <linux/uaccess.h> + +#include "../mm/kasan/kasan.h" + +#define OOB_TAG_OFF (IS_ENABLED(CONFIG_KASAN_GENERIC) ? 0 : KASAN_SHADOW_SCALE_SIZE) + +static noinline void __init copy_user_test(void) +{ + char *kmem; + char __user *usermem; + size_t size = 10; + int unused; + + kmem = kmalloc(size, GFP_KERNEL); + if (!kmem) + return; + + usermem = (char __user *)vm_mmap(NULL, 0, PAGE_SIZE, + PROT_READ | PROT_WRITE | PROT_EXEC, + MAP_ANONYMOUS | MAP_PRIVATE, 0); + if (IS_ERR(usermem)) { + pr_err("Failed to allocate user memory\n"); + kfree(kmem); + return; + } + + pr_info("out-of-bounds in copy_from_user()\n"); + unused = copy_from_user(kmem, usermem, size + 1 + OOB_TAG_OFF); + + pr_info("out-of-bounds in copy_to_user()\n"); + unused = copy_to_user(usermem, kmem, size + 1 + OOB_TAG_OFF); + + pr_info("out-of-bounds in __copy_from_user()\n"); + unused = __copy_from_user(kmem, usermem, size + 1 + OOB_TAG_OFF); + + pr_info("out-of-bounds in __copy_to_user()\n"); + unused = __copy_to_user(usermem, kmem, size + 1 + OOB_TAG_OFF); + + pr_info("out-of-bounds in __copy_from_user_inatomic()\n"); + unused = __copy_from_user_inatomic(kmem, usermem, size + 1 + OOB_TAG_OFF); + + pr_info("out-of-bounds in __copy_to_user_inatomic()\n"); + unused = __copy_to_user_inatomic(usermem, kmem, size + 1 + OOB_TAG_OFF); + + pr_info("out-of-bounds in strncpy_from_user()\n"); + unused = strncpy_from_user(kmem, usermem, size + 1 + OOB_TAG_OFF); + + vm_munmap((unsigned long)usermem, PAGE_SIZE); + kfree(kmem); +} + +static struct kasan_rcu_info { + int i; + struct rcu_head rcu; +} *global_rcu_ptr; + +static noinline void __init kasan_rcu_reclaim(struct rcu_head *rp) +{ + struct kasan_rcu_info *fp = container_of(rp, + struct kasan_rcu_info, rcu); + + kfree(fp); + fp->i = 1; +} + +static noinline void __init kasan_rcu_uaf(void) +{ + struct kasan_rcu_info *ptr; + + pr_info("use-after-free in kasan_rcu_reclaim\n"); + ptr = kmalloc(sizeof(struct kasan_rcu_info), GFP_KERNEL); + if (!ptr) { + pr_err("Allocation failed\n"); + return; + } + + global_rcu_ptr = rcu_dereference_protected(ptr, NULL); + call_rcu(&global_rcu_ptr->rcu, kasan_rcu_reclaim); +} + + +static int __init test_kasan_module_init(void) +{ + /* + * Temporarily enable multi-shot mode. Otherwise, we'd only get a + * report for the first case. + */ + bool multishot = kasan_save_enable_multi_shot(); + + copy_user_test(); + kasan_rcu_uaf(); + + kasan_restore_multi_shot(multishot); + return -EAGAIN; +} + +module_init(test_kasan_module_init); +MODULE_LICENSE("GPL");