~hc/RK356X_SDK_RELEASE.git

..	..	@@ -1,371 +1,601 @@
	1	+// SPDX-License-Identifier: GPL-2.0-only
1	2	/*
2	3	*
3	4	* Copyright (c) 2014 Samsung Electronics Co., Ltd.
4	5	* Author: Andrey Ryabinin <a.ryabinin@samsung.com>
5		- *
6		- * This program is free software; you can redistribute it and/or modify
7		- * it under the terms of the GNU General Public License version 2 as
8		- * published by the Free Software Foundation.
9		- *
10	6	*/
11	7
12		-#define pr_fmt(fmt) "kasan test: %s " fmt, __func__
13		-
	8	+#include <linux/bitops.h>
14	9	#include <linux/delay.h>
	10	+#include <linux/kasan.h>
15	11	#include <linux/kernel.h>
16		-#include <linux/mman.h>
17	12	#include <linux/mm.h>
	13	+#include <linux/mman.h>
	14	+#include <linux/module.h>
18	15	#include <linux/printk.h>
	16	+#include <linux/random.h>
19	17	#include <linux/slab.h>
20	18	#include <linux/string.h>
21	19	#include <linux/uaccess.h>
22		-#include <linux/module.h>
23		-#include <linux/kasan.h>
	20	+#include <linux/io.h>
	21	+#include <linux/vmalloc.h>
	22	+
	23	+#include <asm/page.h>
	24	+
	25	+#include <kunit/test.h>
	26	+
	27	+#include "../mm/kasan/kasan.h"
	28	+
	29	+#define OOB_TAG_OFF (IS_ENABLED(CONFIG_KASAN_GENERIC) ? 0 : KASAN_GRANULE_SIZE)
24	30
25	31	/*
26		- * Note: test functions are marked noinline so that their names appear in
27		- * reports.
	32	+ * Some tests use these global variables to store return values from function
	33	+ * calls that could otherwise be eliminated by the compiler as dead code.
28	34	*/
	35	+void *kasan_ptr_result;
	36	+int kasan_int_result;
29	37
30		-static noinline void __init kmalloc_oob_right(void)
	38	+static struct kunit_resource resource;
	39	+static struct kunit_kasan_expectation fail_data;
	40	+static bool multishot;
	41	+
	42	+/*
	43	+ * Temporarily enable multi-shot mode. Otherwise, KASAN would only report the
	44	+ * first detected bug and panic the kernel if panic_on_warn is enabled. For
	45	+ * hardware tag-based KASAN also allow tag checking to be reenabled for each
	46	+ * test, see the comment for KUNIT_EXPECT_KASAN_FAIL().
	47	+ */
	48	+static int kasan_test_init(struct kunit *test)
	49	+{
	50	+ if (!kasan_enabled()) {
	51	+ kunit_err(test, "can't run KASAN tests with KASAN disabled");
	52	+ return -1;
	53	+ }
	54	+
	55	+ multishot = kasan_save_enable_multi_shot();
	56	+ kasan_set_tagging_report_once(false);
	57	+ return 0;
	58	+}
	59	+
	60	+static void kasan_test_exit(struct kunit *test)
	61	+{
	62	+ kasan_set_tagging_report_once(true);
	63	+ kasan_restore_multi_shot(multishot);
	64	+}
	65	+
	66	+/**
	67	+ * KUNIT_EXPECT_KASAN_FAIL() - check that the executed expression produces a
	68	+ * KASAN report; causes a test failure otherwise. This relies on a KUnit
	69	+ * resource named "kasan_data". Do not use this name for KUnit resources
	70	+ * outside of KASAN tests.
	71	+ *
	72	+ * For hardware tag-based KASAN in sync mode, when a tag fault happens, tag
	73	+ * checking is auto-disabled. When this happens, this test handler reenables
	74	+ * tag checking. As tag checking can be only disabled or enabled per CPU,
	75	+ * this handler disables migration (preemption).
	76	+ *
	77	+ * Since the compiler doesn't see that the expression can change the fail_data
	78	+ * fields, it can reorder or optimize away the accesses to those fields.
	79	+ * Use READ/WRITE_ONCE() for the accesses and compiler barriers around the
	80	+ * expression to prevent that.
	81	+ */
	82	+#define KUNIT_EXPECT_KASAN_FAIL(test, expression) do { \
	83	+ if (IS_ENABLED(CONFIG_KASAN_HW_TAGS) && \
	84	+ !kasan_async_mode_enabled()) \
	85	+ migrate_disable(); \
	86	+ WRITE_ONCE(fail_data.report_expected, true); \
	87	+ WRITE_ONCE(fail_data.report_found, false); \
	88	+ kunit_add_named_resource(test, \
	89	+ NULL, \
	90	+ NULL, \
	91	+ &resource, \
	92	+ "kasan_data", &fail_data); \
	93	+ barrier(); \
	94	+ expression; \
	95	+ barrier(); \
	96	+ if (kasan_async_mode_enabled()) \
	97	+ kasan_force_async_fault(); \
	98	+ barrier(); \
	99	+ KUNIT_EXPECT_EQ(test, \
	100	+ READ_ONCE(fail_data.report_expected), \
	101	+ READ_ONCE(fail_data.report_found)); \
	102	+ if (IS_ENABLED(CONFIG_KASAN_HW_TAGS) && \
	103	+ !kasan_async_mode_enabled()) { \
	104	+ if (READ_ONCE(fail_data.report_found)) \
	105	+ kasan_enable_tagging_sync(); \
	106	+ migrate_enable(); \
	107	+ } \
	108	+} while (0)
	109	+
	110	+#define KASAN_TEST_NEEDS_CONFIG_ON(test, config) do { \
	111	+ if (!IS_ENABLED(config)) { \
	112	+ kunit_info((test), "skipping, " #config " required"); \
	113	+ return; \
	114	+ } \
	115	+} while (0)
	116	+
	117	+#define KASAN_TEST_NEEDS_CONFIG_OFF(test, config) do { \
	118	+ if (IS_ENABLED(config)) { \
	119	+ kunit_info((test), "skipping, " #config " enabled"); \
	120	+ return; \
	121	+ } \
	122	+} while (0)
	123	+
	124	+static void kmalloc_oob_right(struct kunit *test)
31	125	{
32	126	char *ptr;
33	127	size_t size = 123;
34	128
35		- pr_info("out-of-bounds to right\n");
36	129	ptr = kmalloc(size, GFP_KERNEL);
37		- if (!ptr) {
38		- pr_err("Allocation failed\n");
39		- return;
40		- }
	130	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
41	131
42		- ptr[size] = 'x';
	132	+ KUNIT_EXPECT_KASAN_FAIL(test, ptr[size + OOB_TAG_OFF] = 'x');
43	133	kfree(ptr);
44	134	}
45	135
46		-static noinline void __init kmalloc_oob_left(void)
	136	+static void kmalloc_oob_left(struct kunit *test)
47	137	{
48	138	char *ptr;
49	139	size_t size = 15;
50	140
51		- pr_info("out-of-bounds to left\n");
52	141	ptr = kmalloc(size, GFP_KERNEL);
53		- if (!ptr) {
54		- pr_err("Allocation failed\n");
55		- return;
56		- }
	142	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
57	143
58		- ptr = (ptr - 1);
	144	+ KUNIT_EXPECT_KASAN_FAIL(test, ptr = (ptr - 1));
59	145	kfree(ptr);
60	146	}
61	147
62		-static noinline void __init kmalloc_node_oob_right(void)
	148	+static void kmalloc_node_oob_right(struct kunit *test)
63	149	{
64	150	char *ptr;
65	151	size_t size = 4096;
66	152
67		- pr_info("kmalloc_node(): out-of-bounds to right\n");
68	153	ptr = kmalloc_node(size, GFP_KERNEL, 0);
69		- if (!ptr) {
70		- pr_err("Allocation failed\n");
71		- return;
72		- }
	154	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
73	155
74		- ptr[size] = 0;
	156	+ KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 0);
75	157	kfree(ptr);
76	158	}
77	159
78		-#ifdef CONFIG_SLUB
79		-static noinline void __init kmalloc_pagealloc_oob_right(void)
	160	+/*
	161	+ * These kmalloc_pagealloc_* tests try allocating a memory chunk that doesn't
	162	+ * fit into a slab cache and therefore is allocated via the page allocator
	163	+ * fallback. Since this kind of fallback is only implemented for SLUB, these
	164	+ * tests are limited to that allocator.
	165	+ */
	166	+static void kmalloc_pagealloc_oob_right(struct kunit *test)
80	167	{
81	168	char *ptr;
82	169	size_t size = KMALLOC_MAX_CACHE_SIZE + 10;
83	170
84		- /* Allocate a chunk that does not fit into a SLUB cache to trigger
85		- * the page allocator fallback.
	171	+ KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB);
	172	+
	173	+ ptr = kmalloc(size, GFP_KERNEL);
	174	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
	175	+
	176	+ KUNIT_EXPECT_KASAN_FAIL(test, ptr[size + OOB_TAG_OFF] = 0);
	177	+
	178	+ kfree(ptr);
	179	+}
	180	+
	181	+static void kmalloc_pagealloc_uaf(struct kunit *test)
	182	+{
	183	+ char *ptr;
	184	+ size_t size = KMALLOC_MAX_CACHE_SIZE + 10;
	185	+
	186	+ KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB);
	187	+
	188	+ ptr = kmalloc(size, GFP_KERNEL);
	189	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
	190	+ kfree(ptr);
	191	+
	192	+ KUNIT_EXPECT_KASAN_FAIL(test, ptr[0] = 0);
	193	+}
	194	+
	195	+static void kmalloc_pagealloc_invalid_free(struct kunit *test)
	196	+{
	197	+ char *ptr;
	198	+ size_t size = KMALLOC_MAX_CACHE_SIZE + 10;
	199	+
	200	+ KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB);
	201	+
	202	+ ptr = kmalloc(size, GFP_KERNEL);
	203	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
	204	+
	205	+ KUNIT_EXPECT_KASAN_FAIL(test, kfree(ptr + 1));
	206	+}
	207	+
	208	+static void pagealloc_oob_right(struct kunit *test)
	209	+{
	210	+ char *ptr;
	211	+ struct page *pages;
	212	+ size_t order = 4;
	213	+ size_t size = (1UL << (PAGE_SHIFT + order));
	214	+
	215	+ /*
	216	+ * With generic KASAN page allocations have no redzones, thus
	217	+ * out-of-bounds detection is not guaranteed.
	218	+ * See https://bugzilla.kernel.org/show_bug.cgi?id=210503.
86	219	*/
87		- pr_info("kmalloc pagealloc allocation: out-of-bounds to right\n");
88		- ptr = kmalloc(size, GFP_KERNEL);
89		- if (!ptr) {
90		- pr_err("Allocation failed\n");
91		- return;
92		- }
	220	+ KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC);
93	221
94		- ptr[size] = 0;
95		- kfree(ptr);
	222	+ pages = alloc_pages(GFP_KERNEL, order);
	223	+ ptr = page_address(pages);
	224	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
	225	+
	226	+ KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 0);
	227	+ free_pages((unsigned long)ptr, order);
96	228	}
97	229
98		-static noinline void __init kmalloc_pagealloc_uaf(void)
	230	+static void pagealloc_uaf(struct kunit *test)
99	231	{
100	232	char *ptr;
101		- size_t size = KMALLOC_MAX_CACHE_SIZE + 10;
	233	+ struct page *pages;
	234	+ size_t order = 4;
102	235
103		- pr_info("kmalloc pagealloc allocation: use-after-free\n");
104		- ptr = kmalloc(size, GFP_KERNEL);
105		- if (!ptr) {
106		- pr_err("Allocation failed\n");
107		- return;
108		- }
	236	+ pages = alloc_pages(GFP_KERNEL, order);
	237	+ ptr = page_address(pages);
	238	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
	239	+ free_pages((unsigned long)ptr, order);
109	240
110		- kfree(ptr);
111		- ptr[0] = 0;
	241	+ KUNIT_EXPECT_KASAN_FAIL(test, ptr[0] = 0);
112	242	}
113	243
114		-static noinline void __init kmalloc_pagealloc_invalid_free(void)
115		-{
116		- char *ptr;
117		- size_t size = KMALLOC_MAX_CACHE_SIZE + 10;
118		-
119		- pr_info("kmalloc pagealloc allocation: invalid-free\n");
120		- ptr = kmalloc(size, GFP_KERNEL);
121		- if (!ptr) {
122		- pr_err("Allocation failed\n");
123		- return;
124		- }
125		-
126		- kfree(ptr + 1);
127		-}
128		-#endif
129		-
130		-static noinline void __init kmalloc_large_oob_right(void)
	244	+static void kmalloc_large_oob_right(struct kunit *test)
131	245	{
132	246	char *ptr;
133	247	size_t size = KMALLOC_MAX_CACHE_SIZE - 256;
134		- /* Allocate a chunk that is large enough, but still fits into a slab
	248	+
	249	+ /*
	250	+ * Allocate a chunk that is large enough, but still fits into a slab
135	251	* and does not trigger the page allocator fallback in SLUB.
136	252	*/
137		- pr_info("kmalloc large allocation: out-of-bounds to right\n");
138	253	ptr = kmalloc(size, GFP_KERNEL);
139		- if (!ptr) {
140		- pr_err("Allocation failed\n");
141		- return;
142		- }
	254	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
143	255
144		- ptr[size] = 0;
	256	+ KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 0);
145	257	kfree(ptr);
146	258	}
147	259
148		-static noinline void __init kmalloc_oob_krealloc_more(void)
	260	+static void krealloc_more_oob_helper(struct kunit *test,
	261	+ size_t size1, size_t size2)
149	262	{
150	263	char ptr1, ptr2;
151		- size_t size1 = 17;
152		- size_t size2 = 19;
	264	+ size_t middle;
153	265
154		- pr_info("out-of-bounds after krealloc more\n");
	266	+ KUNIT_ASSERT_LT(test, size1, size2);
	267	+ middle = size1 + (size2 - size1) / 2;
	268	+
155	269	ptr1 = kmalloc(size1, GFP_KERNEL);
156		- ptr2 = krealloc(ptr1, size2, GFP_KERNEL);
157		- if (!ptr1 \|\| !ptr2) {
158		- pr_err("Allocation failed\n");
159		- kfree(ptr1);
160		- kfree(ptr2);
161		- return;
162		- }
	270	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1);
163	271
164		- ptr2[size2] = 'x';
	272	+ ptr2 = krealloc(ptr1, size2, GFP_KERNEL);
	273	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2);
	274	+
	275	+ /* All offsets up to size2 must be accessible. */
	276	+ ptr2[size1 - 1] = 'x';
	277	+ ptr2[size1] = 'x';
	278	+ ptr2[middle] = 'x';
	279	+ ptr2[size2 - 1] = 'x';
	280	+
	281	+ /* Generic mode is precise, so unaligned size2 must be inaccessible. */
	282	+ if (IS_ENABLED(CONFIG_KASAN_GENERIC))
	283	+ KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size2] = 'x');
	284	+
	285	+ /* For all modes first aligned offset after size2 must be inaccessible. */
	286	+ KUNIT_EXPECT_KASAN_FAIL(test,
	287	+ ptr2[round_up(size2, KASAN_GRANULE_SIZE)] = 'x');
	288	+
165	289	kfree(ptr2);
166	290	}
167	291
168		-static noinline void __init kmalloc_oob_krealloc_less(void)
	292	+static void krealloc_less_oob_helper(struct kunit *test,
	293	+ size_t size1, size_t size2)
169	294	{
170	295	char ptr1, ptr2;
171		- size_t size1 = 17;
172		- size_t size2 = 15;
	296	+ size_t middle;
173	297
174		- pr_info("out-of-bounds after krealloc less\n");
	298	+ KUNIT_ASSERT_LT(test, size2, size1);
	299	+ middle = size2 + (size1 - size2) / 2;
	300	+
175	301	ptr1 = kmalloc(size1, GFP_KERNEL);
	302	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1);
	303	+
176	304	ptr2 = krealloc(ptr1, size2, GFP_KERNEL);
177		- if (!ptr1 \|\| !ptr2) {
178		- pr_err("Allocation failed\n");
179		- kfree(ptr1);
180		- return;
181		- }
182		- ptr2[size2] = 'x';
	305	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2);
	306	+
	307	+ /* Must be accessible for all modes. */
	308	+ ptr2[size2 - 1] = 'x';
	309	+
	310	+ /* Generic mode is precise, so unaligned size2 must be inaccessible. */
	311	+ if (IS_ENABLED(CONFIG_KASAN_GENERIC))
	312	+ KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size2] = 'x');
	313	+
	314	+ /* For all modes first aligned offset after size2 must be inaccessible. */
	315	+ KUNIT_EXPECT_KASAN_FAIL(test,
	316	+ ptr2[round_up(size2, KASAN_GRANULE_SIZE)] = 'x');
	317	+
	318	+ /*
	319	+ * For all modes all size2, middle, and size1 should land in separate
	320	+ * granules and thus the latter two offsets should be inaccessible.
	321	+ */
	322	+ KUNIT_EXPECT_LE(test, round_up(size2, KASAN_GRANULE_SIZE),
	323	+ round_down(middle, KASAN_GRANULE_SIZE));
	324	+ KUNIT_EXPECT_LE(test, round_up(middle, KASAN_GRANULE_SIZE),
	325	+ round_down(size1, KASAN_GRANULE_SIZE));
	326	+ KUNIT_EXPECT_KASAN_FAIL(test, ptr2[middle] = 'x');
	327	+ KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size1 - 1] = 'x');
	328	+ KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size1] = 'x');
	329	+
183	330	kfree(ptr2);
184	331	}
185	332
186		-static noinline void __init kmalloc_oob_16(void)
	333	+static void krealloc_more_oob(struct kunit *test)
	334	+{
	335	+ krealloc_more_oob_helper(test, 201, 235);
	336	+}
	337	+
	338	+static void krealloc_less_oob(struct kunit *test)
	339	+{
	340	+ krealloc_less_oob_helper(test, 235, 201);
	341	+}
	342	+
	343	+static void krealloc_pagealloc_more_oob(struct kunit *test)
	344	+{
	345	+ /* page_alloc fallback in only implemented for SLUB. */
	346	+ KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB);
	347	+
	348	+ krealloc_more_oob_helper(test, KMALLOC_MAX_CACHE_SIZE + 201,
	349	+ KMALLOC_MAX_CACHE_SIZE + 235);
	350	+}
	351	+
	352	+static void krealloc_pagealloc_less_oob(struct kunit *test)
	353	+{
	354	+ /* page_alloc fallback in only implemented for SLUB. */
	355	+ KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB);
	356	+
	357	+ krealloc_less_oob_helper(test, KMALLOC_MAX_CACHE_SIZE + 235,
	358	+ KMALLOC_MAX_CACHE_SIZE + 201);
	359	+}
	360	+
	361	+/*
	362	+ * Check that krealloc() detects a use-after-free, returns NULL,
	363	+ * and doesn't unpoison the freed object.
	364	+ */
	365	+static void krealloc_uaf(struct kunit *test)
	366	+{
	367	+ char ptr1, ptr2;
	368	+ int size1 = 201;
	369	+ int size2 = 235;
	370	+
	371	+ ptr1 = kmalloc(size1, GFP_KERNEL);
	372	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1);
	373	+ kfree(ptr1);
	374	+
	375	+ KUNIT_EXPECT_KASAN_FAIL(test, ptr2 = krealloc(ptr1, size2, GFP_KERNEL));
	376	+ KUNIT_ASSERT_PTR_EQ(test, (void *)ptr2, NULL);
	377	+ KUNIT_EXPECT_KASAN_FAIL(test, (volatile char )ptr1);
	378	+}
	379	+
	380	+static void kmalloc_oob_16(struct kunit *test)
187	381	{
188	382	struct {
189	383	u64 words[2];
190	384	} ptr1, ptr2;
191	385
192		- pr_info("kmalloc out-of-bounds for 16-bytes access\n");
	386	+ /* This test is specifically crafted for the generic mode. */
	387	+ KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC);
	388	+
193	389	ptr1 = kmalloc(sizeof(*ptr1) - 3, GFP_KERNEL);
	390	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1);
	391	+
194	392	ptr2 = kmalloc(sizeof(*ptr2), GFP_KERNEL);
195		- if (!ptr1 \|\| !ptr2) {
196		- pr_err("Allocation failed\n");
197		- kfree(ptr1);
198		- kfree(ptr2);
199		- return;
200		- }
201		- ptr1 = ptr2;
	393	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2);
	394	+
	395	+ KUNIT_EXPECT_KASAN_FAIL(test, ptr1 = ptr2);
202	396	kfree(ptr1);
203	397	kfree(ptr2);
204	398	}
205	399
206		-static noinline void __init kmalloc_oob_memset_2(void)
	400	+static void kmalloc_uaf_16(struct kunit *test)
	401	+{
	402	+ struct {
	403	+ u64 words[2];
	404	+ } ptr1, ptr2;
	405	+
	406	+ ptr1 = kmalloc(sizeof(*ptr1), GFP_KERNEL);
	407	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1);
	408	+
	409	+ ptr2 = kmalloc(sizeof(*ptr2), GFP_KERNEL);
	410	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2);
	411	+ kfree(ptr2);
	412	+
	413	+ KUNIT_EXPECT_KASAN_FAIL(test, ptr1 = ptr2);
	414	+ kfree(ptr1);
	415	+}
	416	+
	417	+static void kmalloc_oob_memset_2(struct kunit *test)
207	418	{
208	419	char *ptr;
209	420	size_t size = 8;
210	421
211		- pr_info("out-of-bounds in memset2\n");
212	422	ptr = kmalloc(size, GFP_KERNEL);
213		- if (!ptr) {
214		- pr_err("Allocation failed\n");
215		- return;
216		- }
	423	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
217	424
218		- memset(ptr+7, 0, 2);
	425	+ KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + 7 + OOB_TAG_OFF, 0, 2));
219	426	kfree(ptr);
220	427	}
221	428
222		-static noinline void __init kmalloc_oob_memset_4(void)
	429	+static void kmalloc_oob_memset_4(struct kunit *test)
223	430	{
224	431	char *ptr;
225	432	size_t size = 8;
226	433
227		- pr_info("out-of-bounds in memset4\n");
228	434	ptr = kmalloc(size, GFP_KERNEL);
229		- if (!ptr) {
230		- pr_err("Allocation failed\n");
231		- return;
232		- }
	435	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
233	436
234		- memset(ptr+5, 0, 4);
	437	+ KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + 5 + OOB_TAG_OFF, 0, 4));
235	438	kfree(ptr);
236	439	}
237	440
238	441
239		-static noinline void __init kmalloc_oob_memset_8(void)
	442	+static void kmalloc_oob_memset_8(struct kunit *test)
240	443	{
241	444	char *ptr;
242	445	size_t size = 8;
243	446
244		- pr_info("out-of-bounds in memset8\n");
245	447	ptr = kmalloc(size, GFP_KERNEL);
246		- if (!ptr) {
247		- pr_err("Allocation failed\n");
248		- return;
249		- }
	448	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
250	449
251		- memset(ptr+1, 0, 8);
	450	+ KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + 1 + OOB_TAG_OFF, 0, 8));
252	451	kfree(ptr);
253	452	}
254	453
255		-static noinline void __init kmalloc_oob_memset_16(void)
	454	+static void kmalloc_oob_memset_16(struct kunit *test)
256	455	{
257	456	char *ptr;
258	457	size_t size = 16;
259	458
260		- pr_info("out-of-bounds in memset16\n");
261	459	ptr = kmalloc(size, GFP_KERNEL);
262		- if (!ptr) {
263		- pr_err("Allocation failed\n");
264		- return;
265		- }
	460	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
266	461
267		- memset(ptr+1, 0, 16);
	462	+ KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + 1 + OOB_TAG_OFF, 0, 16));
268	463	kfree(ptr);
269	464	}
270	465
271		-static noinline void __init kmalloc_oob_in_memset(void)
	466	+static void kmalloc_oob_in_memset(struct kunit *test)
272	467	{
273	468	char *ptr;
274	469	size_t size = 666;
275	470
276		- pr_info("out-of-bounds in memset\n");
277	471	ptr = kmalloc(size, GFP_KERNEL);
278		- if (!ptr) {
279		- pr_err("Allocation failed\n");
280		- return;
281		- }
	472	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
282	473
283		- memset(ptr, 0, size+5);
	474	+ KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr, 0, size + 5 + OOB_TAG_OFF));
284	475	kfree(ptr);
285	476	}
286	477
287		-static noinline void __init kmalloc_uaf(void)
	478	+static void kmalloc_memmove_invalid_size(struct kunit *test)
	479	+{
	480	+ char *ptr;
	481	+ size_t size = 64;
	482	+ volatile size_t invalid_size = -2;
	483	+
	484	+ ptr = kmalloc(size, GFP_KERNEL);
	485	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
	486	+
	487	+ memset((char *)ptr, 0, 64);
	488	+
	489	+ KUNIT_EXPECT_KASAN_FAIL(test,
	490	+ memmove((char )ptr, (char )ptr + 4, invalid_size));
	491	+ kfree(ptr);
	492	+}
	493	+
	494	+static void kmalloc_uaf(struct kunit *test)
288	495	{
289	496	char *ptr;
290	497	size_t size = 10;
291	498
292		- pr_info("use-after-free\n");
293	499	ptr = kmalloc(size, GFP_KERNEL);
294		- if (!ptr) {
295		- pr_err("Allocation failed\n");
296		- return;
297		- }
	500	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
298	501
299	502	kfree(ptr);
300		- *(ptr + 8) = 'x';
	503	+ KUNIT_EXPECT_KASAN_FAIL(test, *(ptr + 8) = 'x');
301	504	}
302	505
303		-static noinline void __init kmalloc_uaf_memset(void)
	506	+static void kmalloc_uaf_memset(struct kunit *test)
304	507	{
305	508	char *ptr;
306	509	size_t size = 33;
307	510
308		- pr_info("use-after-free in memset\n");
309	511	ptr = kmalloc(size, GFP_KERNEL);
310		- if (!ptr) {
311		- pr_err("Allocation failed\n");
312		- return;
313		- }
	512	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
314	513
315	514	kfree(ptr);
316		- memset(ptr, 0, size);
	515	+ KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr, 0, size));
317	516	}
318	517
319		-static noinline void __init kmalloc_uaf2(void)
	518	+static void kmalloc_uaf2(struct kunit *test)
320	519	{
321	520	char ptr1, ptr2;
322	521	size_t size = 43;
	522	+ int counter = 0;
323	523
324		- pr_info("use-after-free after another kmalloc\n");
	524	+again:
325	525	ptr1 = kmalloc(size, GFP_KERNEL);
326		- if (!ptr1) {
327		- pr_err("Allocation failed\n");
328		- return;
329		- }
	526	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1);
330	527
331	528	kfree(ptr1);
	529	+
332	530	ptr2 = kmalloc(size, GFP_KERNEL);
333		- if (!ptr2) {
334		- pr_err("Allocation failed\n");
335		- return;
	531	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2);
	532	+
	533	+ /*
	534	+ * For tag-based KASAN ptr1 and ptr2 tags might happen to be the same.
	535	+ * Allow up to 16 attempts at generating different tags.
	536	+ */
	537	+ if (!IS_ENABLED(CONFIG_KASAN_GENERIC) && ptr1 == ptr2 && counter++ < 16) {
	538	+ kfree(ptr2);
	539	+ goto again;
336	540	}
337	541
338		- ptr1[40] = 'x';
339		- if (ptr1 == ptr2)
340		- pr_err("Could not detect use-after-free: ptr1 == ptr2\n");
	542	+ KUNIT_EXPECT_KASAN_FAIL(test, ptr1[40] = 'x');
	543	+ KUNIT_EXPECT_PTR_NE(test, ptr1, ptr2);
	544	+
341	545	kfree(ptr2);
342	546	}
343	547
344		-static noinline void __init kmem_cache_oob(void)
	548	+static void kfree_via_page(struct kunit *test)
	549	+{
	550	+ char *ptr;
	551	+ size_t size = 8;
	552	+ struct page *page;
	553	+ unsigned long offset;
	554	+
	555	+ ptr = kmalloc(size, GFP_KERNEL);
	556	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
	557	+
	558	+ page = virt_to_page(ptr);
	559	+ offset = offset_in_page(ptr);
	560	+ kfree(page_address(page) + offset);
	561	+}
	562	+
	563	+static void kfree_via_phys(struct kunit *test)
	564	+{
	565	+ char *ptr;
	566	+ size_t size = 8;
	567	+ phys_addr_t phys;
	568	+
	569	+ ptr = kmalloc(size, GFP_KERNEL);
	570	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
	571	+
	572	+ phys = virt_to_phys(ptr);
	573	+ kfree(phys_to_virt(phys));
	574	+}
	575	+
	576	+static void kmem_cache_oob(struct kunit *test)
345	577	{
346	578	char *p;
347	579	size_t size = 200;
348		- struct kmem_cache *cache = kmem_cache_create("test_cache",
349		- size, 0,
350		- 0, NULL);
351		- if (!cache) {
352		- pr_err("Cache allocation failed\n");
353		- return;
354		- }
355		- pr_info("out-of-bounds in kmem_cache_alloc\n");
	580	+ struct kmem_cache *cache;
	581	+
	582	+ cache = kmem_cache_create("test_cache", size, 0, 0, NULL);
	583	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
	584	+
356	585	p = kmem_cache_alloc(cache, GFP_KERNEL);
357	586	if (!p) {
358		- pr_err("Allocation failed\n");
	587	+ kunit_err(test, "Allocation failed: %s\n", __func__);
359	588	kmem_cache_destroy(cache);
360	589	return;
361	590	}
362	591
363		- *p = p[size];
	592	+ KUNIT_EXPECT_KASAN_FAIL(test, *p = p[size + OOB_TAG_OFF]);
	593	+
364	594	kmem_cache_free(cache, p);
365	595	kmem_cache_destroy(cache);
366	596	}
367	597
368		-static noinline void __init memcg_accounted_kmem_cache(void)
	598	+static void kmem_cache_accounted(struct kunit *test)
369	599	{
370	600	int i;
371	601	char *p;
..	..	@@ -373,12 +603,8 @@
373	603	struct kmem_cache *cache;
374	604
375	605	cache = kmem_cache_create("test_cache", size, 0, SLAB_ACCOUNT, NULL);
376		- if (!cache) {
377		- pr_err("Cache allocation failed\n");
378		- return;
379		- }
	606	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
380	607
381		- pr_info("allocate memcg accounted object\n");
382	608	/*
383	609	* Several allocations with a delay to allow for lazy per memcg kmem
384	610	* cache creation.
..	..	@@ -396,136 +622,157 @@
396	622	kmem_cache_destroy(cache);
397	623	}
398	624
	625	+static void kmem_cache_bulk(struct kunit *test)
	626	+{
	627	+ struct kmem_cache *cache;
	628	+ size_t size = 200;
	629	+ char *p[10];
	630	+ bool ret;
	631	+ int i;
	632	+
	633	+ cache = kmem_cache_create("test_cache", size, 0, 0, NULL);
	634	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
	635	+
	636	+ ret = kmem_cache_alloc_bulk(cache, GFP_KERNEL, ARRAY_SIZE(p), (void **)&p);
	637	+ if (!ret) {
	638	+ kunit_err(test, "Allocation failed: %s\n", __func__);
	639	+ kmem_cache_destroy(cache);
	640	+ return;
	641	+ }
	642	+
	643	+ for (i = 0; i < ARRAY_SIZE(p); i++)
	644	+ p[i][0] = p[i][size - 1] = 42;
	645	+
	646	+ kmem_cache_free_bulk(cache, ARRAY_SIZE(p), (void **)&p);
	647	+ kmem_cache_destroy(cache);
	648	+}
	649	+
399	650	static char global_array[10];
400	651
401		-static noinline void __init kasan_global_oob(void)
	652	+static void kasan_global_oob(struct kunit *test)
402	653	{
403		- volatile int i = 3;
404		- char *p = &global_array[ARRAY_SIZE(global_array) + i];
	654	+ /*
	655	+ * Deliberate out-of-bounds access. To prevent CONFIG_UBSAN_LOCAL_BOUNDS
	656	+ * from failing here and panicing the kernel, access the array via a
	657	+ * volatile pointer, which will prevent the compiler from being able to
	658	+ * determine the array bounds.
	659	+ *
	660	+ * This access uses a volatile pointer to char (char *volatile) rather
	661	+ * than the more conventional pointer to volatile char (volatile char *)
	662	+ * because we want to prevent the compiler from making inferences about
	663	+ * the pointer itself (i.e. its array bounds), not the data that it
	664	+ * refers to.
	665	+ */
	666	+ char *volatile array = global_array;
	667	+ char *p = &array[ARRAY_SIZE(global_array) + 3];
405	668
406		- pr_info("out-of-bounds global variable\n");
407		- (volatile char )p;
	669	+ /* Only generic mode instruments globals. */
	670	+ KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC);
	671	+
	672	+ KUNIT_EXPECT_KASAN_FAIL(test, (volatile char )p);
408	673	}
409	674
410		-static noinline void __init kasan_stack_oob(void)
411		-{
412		- char stack_array[10];
413		- volatile int i = 0;
414		- char *p = &stack_array[ARRAY_SIZE(stack_array) + i];
415		-
416		- pr_info("out-of-bounds on stack\n");
417		- (volatile char )p;
418		-}
419		-
420		-static noinline void __init ksize_unpoisons_memory(void)
	675	+/* Check that ksize() makes the whole object accessible. */
	676	+static void ksize_unpoisons_memory(struct kunit *test)
421	677	{
422	678	char *ptr;
423	679	size_t size = 123, real_size;
424	680
425		- pr_info("ksize() unpoisons the whole allocated chunk\n");
426	681	ptr = kmalloc(size, GFP_KERNEL);
427		- if (!ptr) {
428		- pr_err("Allocation failed\n");
429		- return;
430		- }
	682	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
431	683	real_size = ksize(ptr);
432		- /* This access doesn't trigger an error. */
	684	+
	685	+ /* This access shouldn't trigger a KASAN report. */
433	686	ptr[size] = 'x';
434		- /* This one does. */
435		- ptr[real_size] = 'y';
	687	+
	688	+ /* This one must. */
	689	+ KUNIT_EXPECT_KASAN_FAIL(test, ptr[real_size] = 'y');
	690	+
436	691	kfree(ptr);
437	692	}
438	693
439		-static noinline void __init copy_user_test(void)
	694	+/*
	695	+ * Check that a use-after-free is detected by ksize() and via normal accesses
	696	+ * after it.
	697	+ */
	698	+static void ksize_uaf(struct kunit *test)
440	699	{
441		- char *kmem;
442		- char __user *usermem;
443		- size_t size = 10;
444		- int unused;
	700	+ char *ptr;
	701	+ int size = 128 - KASAN_GRANULE_SIZE;
445	702
446		- kmem = kmalloc(size, GFP_KERNEL);
447		- if (!kmem)
448		- return;
	703	+ ptr = kmalloc(size, GFP_KERNEL);
	704	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
	705	+ kfree(ptr);
449	706
450		- usermem = (char __user *)vm_mmap(NULL, 0, PAGE_SIZE,
451		- PROT_READ \| PROT_WRITE \| PROT_EXEC,
452		- MAP_ANONYMOUS \| MAP_PRIVATE, 0);
453		- if (IS_ERR(usermem)) {
454		- pr_err("Failed to allocate user memory\n");
455		- kfree(kmem);
456		- return;
457		- }
458		-
459		- pr_info("out-of-bounds in copy_from_user()\n");
460		- unused = copy_from_user(kmem, usermem, size + 1);
461		-
462		- pr_info("out-of-bounds in copy_to_user()\n");
463		- unused = copy_to_user(usermem, kmem, size + 1);
464		-
465		- pr_info("out-of-bounds in __copy_from_user()\n");
466		- unused = __copy_from_user(kmem, usermem, size + 1);
467		-
468		- pr_info("out-of-bounds in __copy_to_user()\n");
469		- unused = __copy_to_user(usermem, kmem, size + 1);
470		-
471		- pr_info("out-of-bounds in __copy_from_user_inatomic()\n");
472		- unused = __copy_from_user_inatomic(kmem, usermem, size + 1);
473		-
474		- pr_info("out-of-bounds in __copy_to_user_inatomic()\n");
475		- unused = __copy_to_user_inatomic(usermem, kmem, size + 1);
476		-
477		- pr_info("out-of-bounds in strncpy_from_user()\n");
478		- unused = strncpy_from_user(kmem, usermem, size + 1);
479		-
480		- vm_munmap((unsigned long)usermem, PAGE_SIZE);
481		- kfree(kmem);
	707	+ KUNIT_EXPECT_KASAN_FAIL(test, ksize(ptr));
	708	+ KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = *ptr);
	709	+ KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = *(ptr + size));
482	710	}
483	711
484		-static noinline void __init kasan_alloca_oob_left(void)
	712	+static void kasan_stack_oob(struct kunit *test)
	713	+{
	714	+ char stack_array[10];
	715	+ /* See comment in kasan_global_oob. */
	716	+ char *volatile array = stack_array;
	717	+ char *p = &array[ARRAY_SIZE(stack_array) + OOB_TAG_OFF];
	718	+
	719	+ KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_STACK);
	720	+
	721	+ KUNIT_EXPECT_KASAN_FAIL(test, (volatile char )p);
	722	+}
	723	+
	724	+static void kasan_alloca_oob_left(struct kunit *test)
485	725	{
486	726	volatile int i = 10;
487	727	char alloca_array[i];
488		- char *p = alloca_array - 1;
	728	+ /* See comment in kasan_global_oob. */
	729	+ char *volatile array = alloca_array;
	730	+ char *p = array - 1;
489	731
490		- pr_info("out-of-bounds to left on alloca\n");
491		- (volatile char )p;
	732	+ /* Only generic mode instruments dynamic allocas. */
	733	+ KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC);
	734	+ KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_STACK);
	735	+
	736	+ KUNIT_EXPECT_KASAN_FAIL(test, (volatile char )p);
492	737	}
493	738
494		-static noinline void __init kasan_alloca_oob_right(void)
	739	+static void kasan_alloca_oob_right(struct kunit *test)
495	740	{
496	741	volatile int i = 10;
497	742	char alloca_array[i];
498		- char *p = alloca_array + i;
	743	+ /* See comment in kasan_global_oob. */
	744	+ char *volatile array = alloca_array;
	745	+ char *p = array + i;
499	746
500		- pr_info("out-of-bounds to right on alloca\n");
501		- (volatile char )p;
	747	+ /* Only generic mode instruments dynamic allocas. */
	748	+ KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC);
	749	+ KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_STACK);
	750	+
	751	+ KUNIT_EXPECT_KASAN_FAIL(test, (volatile char )p);
502	752	}
503	753
504		-static noinline void __init kmem_cache_double_free(void)
	754	+static void kmem_cache_double_free(struct kunit *test)
505	755	{
506	756	char *p;
507	757	size_t size = 200;
508	758	struct kmem_cache *cache;
509	759
510	760	cache = kmem_cache_create("test_cache", size, 0, 0, NULL);
511		- if (!cache) {
512		- pr_err("Cache allocation failed\n");
513		- return;
514		- }
515		- pr_info("double-free on heap object\n");
	761	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
	762	+
516	763	p = kmem_cache_alloc(cache, GFP_KERNEL);
517	764	if (!p) {
518		- pr_err("Allocation failed\n");
	765	+ kunit_err(test, "Allocation failed: %s\n", __func__);
519	766	kmem_cache_destroy(cache);
520	767	return;
521	768	}
522	769
523	770	kmem_cache_free(cache, p);
524		- kmem_cache_free(cache, p);
	771	+ KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_free(cache, p));
525	772	kmem_cache_destroy(cache);
526	773	}
527	774
528		-static noinline void __init kmem_cache_invalid_free(void)
	775	+static void kmem_cache_invalid_free(struct kunit *test)
529	776	{
530	777	char *p;
531	778	size_t size = 200;
..	..	@@ -533,20 +780,17 @@
533	780
534	781	cache = kmem_cache_create("test_cache", size, 0, SLAB_TYPESAFE_BY_RCU,
535	782	NULL);
536		- if (!cache) {
537		- pr_err("Cache allocation failed\n");
538		- return;
539		- }
540		- pr_info("invalid-free of heap object\n");
	783	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
	784	+
541	785	p = kmem_cache_alloc(cache, GFP_KERNEL);
542	786	if (!p) {
543		- pr_err("Allocation failed\n");
	787	+ kunit_err(test, "Allocation failed: %s\n", __func__);
544	788	kmem_cache_destroy(cache);
545	789	return;
546	790	}
547	791
548		- /* Trigger invalid free, the object doesn't get freed */
549		- kmem_cache_free(cache, p + 1);
	792	+ /* Trigger invalid free, the object doesn't get freed. */
	793	+ KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_free(cache, p + 1));
550	794
551	795	/*
552	796	* Properly free the object to prevent the "Objects remaining in
..	..	@@ -557,45 +801,66 @@
557	801	kmem_cache_destroy(cache);
558	802	}
559	803
560		-static noinline void __init kasan_memchr(void)
	804	+static void kasan_memchr(struct kunit *test)
561	805	{
562	806	char *ptr;
563	807	size_t size = 24;
564	808
565		- pr_info("out-of-bounds in memchr\n");
566		- ptr = kmalloc(size, GFP_KERNEL \| __GFP_ZERO);
567		- if (!ptr)
568		- return;
	809	+ /*
	810	+ * str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT.
	811	+ * See https://bugzilla.kernel.org/show_bug.cgi?id=206337 for details.
	812	+ */
	813	+ KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_AMD_MEM_ENCRYPT);
569	814
570		- memchr(ptr, '1', size + 1);
	815	+ if (OOB_TAG_OFF)
	816	+ size = round_up(size, OOB_TAG_OFF);
	817	+
	818	+ ptr = kmalloc(size, GFP_KERNEL \| __GFP_ZERO);
	819	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
	820	+
	821	+ KUNIT_EXPECT_KASAN_FAIL(test,
	822	+ kasan_ptr_result = memchr(ptr, '1', size + 1));
	823	+
571	824	kfree(ptr);
572	825	}
573	826
574		-static noinline void __init kasan_memcmp(void)
	827	+static void kasan_memcmp(struct kunit *test)
575	828	{
576	829	char *ptr;
577	830	size_t size = 24;
578	831	int arr[9];
579	832
580		- pr_info("out-of-bounds in memcmp\n");
581		- ptr = kmalloc(size, GFP_KERNEL \| __GFP_ZERO);
582		- if (!ptr)
583		- return;
	833	+ /*
	834	+ * str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT.
	835	+ * See https://bugzilla.kernel.org/show_bug.cgi?id=206337 for details.
	836	+ */
	837	+ KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_AMD_MEM_ENCRYPT);
584	838
	839	+ if (OOB_TAG_OFF)
	840	+ size = round_up(size, OOB_TAG_OFF);
	841	+
	842	+ ptr = kmalloc(size, GFP_KERNEL \| __GFP_ZERO);
	843	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
585	844	memset(arr, 0, sizeof(arr));
586		- memcmp(ptr, arr, size+1);
	845	+
	846	+ KUNIT_EXPECT_KASAN_FAIL(test,
	847	+ kasan_int_result = memcmp(ptr, arr, size+1));
587	848	kfree(ptr);
588	849	}
589	850
590		-static noinline void __init kasan_strings(void)
	851	+static void kasan_strings(struct kunit *test)
591	852	{
592	853	char *ptr;
593	854	size_t size = 24;
594	855
595		- pr_info("use-after-free in strchr\n");
	856	+ /*
	857	+ * str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT.
	858	+ * See https://bugzilla.kernel.org/show_bug.cgi?id=206337 for details.
	859	+ */
	860	+ KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_AMD_MEM_ENCRYPT);
	861	+
596	862	ptr = kmalloc(size, GFP_KERNEL \| __GFP_ZERO);
597		- if (!ptr)
598		- return;
	863	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
599	864
600	865	kfree(ptr);
601	866
..	..	@@ -606,70 +871,271 @@
606	871	* will likely point to zeroed byte.
607	872	*/
608	873	ptr += 16;
609		- strchr(ptr, '1');
	874	+ KUNIT_EXPECT_KASAN_FAIL(test, kasan_ptr_result = strchr(ptr, '1'));
610	875
611		- pr_info("use-after-free in strrchr\n");
612		- strrchr(ptr, '1');
	876	+ KUNIT_EXPECT_KASAN_FAIL(test, kasan_ptr_result = strrchr(ptr, '1'));
613	877
614		- pr_info("use-after-free in strcmp\n");
615		- strcmp(ptr, "2");
	878	+ KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strcmp(ptr, "2"));
616	879
617		- pr_info("use-after-free in strncmp\n");
618		- strncmp(ptr, "2", 1);
	880	+ KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strncmp(ptr, "2", 1));
619	881
620		- pr_info("use-after-free in strlen\n");
621		- strlen(ptr);
	882	+ KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strlen(ptr));
622	883
623		- pr_info("use-after-free in strnlen\n");
624		- strnlen(ptr, 1);
	884	+ KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strnlen(ptr, 1));
625	885	}
626	886
627		-static int __init kmalloc_tests_init(void)
	887	+static void kasan_bitops_modify(struct kunit test, int nr, void addr)
628	888	{
629		- /*
630		- * Temporarily enable multi-shot mode. Otherwise, we'd only get a
631		- * report for the first case.
632		- */
633		- bool multishot = kasan_save_enable_multi_shot();
634		-
635		- kmalloc_oob_right();
636		- kmalloc_oob_left();
637		- kmalloc_node_oob_right();
638		-#ifdef CONFIG_SLUB
639		- kmalloc_pagealloc_oob_right();
640		- kmalloc_pagealloc_uaf();
641		- kmalloc_pagealloc_invalid_free();
642		-#endif
643		- kmalloc_large_oob_right();
644		- kmalloc_oob_krealloc_more();
645		- kmalloc_oob_krealloc_less();
646		- kmalloc_oob_16();
647		- kmalloc_oob_in_memset();
648		- kmalloc_oob_memset_2();
649		- kmalloc_oob_memset_4();
650		- kmalloc_oob_memset_8();
651		- kmalloc_oob_memset_16();
652		- kmalloc_uaf();
653		- kmalloc_uaf_memset();
654		- kmalloc_uaf2();
655		- kmem_cache_oob();
656		- memcg_accounted_kmem_cache();
657		- kasan_stack_oob();
658		- kasan_global_oob();
659		- kasan_alloca_oob_left();
660		- kasan_alloca_oob_right();
661		- ksize_unpoisons_memory();
662		- copy_user_test();
663		- kmem_cache_double_free();
664		- kmem_cache_invalid_free();
665		- kasan_memchr();
666		- kasan_memcmp();
667		- kasan_strings();
668		-
669		- kasan_restore_multi_shot(multishot);
670		-
671		- return -EAGAIN;
	889	+ KUNIT_EXPECT_KASAN_FAIL(test, set_bit(nr, addr));
	890	+ KUNIT_EXPECT_KASAN_FAIL(test, __set_bit(nr, addr));
	891	+ KUNIT_EXPECT_KASAN_FAIL(test, clear_bit(nr, addr));
	892	+ KUNIT_EXPECT_KASAN_FAIL(test, __clear_bit(nr, addr));
	893	+ KUNIT_EXPECT_KASAN_FAIL(test, clear_bit_unlock(nr, addr));
	894	+ KUNIT_EXPECT_KASAN_FAIL(test, __clear_bit_unlock(nr, addr));
	895	+ KUNIT_EXPECT_KASAN_FAIL(test, change_bit(nr, addr));
	896	+ KUNIT_EXPECT_KASAN_FAIL(test, __change_bit(nr, addr));
672	897	}
673	898
674		-module_init(kmalloc_tests_init);
	899	+static void kasan_bitops_test_and_modify(struct kunit test, int nr, void addr)
	900	+{
	901	+ KUNIT_EXPECT_KASAN_FAIL(test, test_and_set_bit(nr, addr));
	902	+ KUNIT_EXPECT_KASAN_FAIL(test, __test_and_set_bit(nr, addr));
	903	+ KUNIT_EXPECT_KASAN_FAIL(test, test_and_set_bit_lock(nr, addr));
	904	+ KUNIT_EXPECT_KASAN_FAIL(test, test_and_clear_bit(nr, addr));
	905	+ KUNIT_EXPECT_KASAN_FAIL(test, __test_and_clear_bit(nr, addr));
	906	+ KUNIT_EXPECT_KASAN_FAIL(test, test_and_change_bit(nr, addr));
	907	+ KUNIT_EXPECT_KASAN_FAIL(test, __test_and_change_bit(nr, addr));
	908	+ KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = test_bit(nr, addr));
	909	+
	910	+#if defined(clear_bit_unlock_is_negative_byte)
	911	+ KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result =
	912	+ clear_bit_unlock_is_negative_byte(nr, addr));
	913	+#endif
	914	+}
	915	+
	916	+static void kasan_bitops_generic(struct kunit *test)
	917	+{
	918	+ long *bits;
	919	+
	920	+ /* This test is specifically crafted for the generic mode. */
	921	+ KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC);
	922	+
	923	+ /*
	924	+ * Allocate 1 more byte, which causes kzalloc to round up to 16 bytes;
	925	+ * this way we do not actually corrupt other memory.
	926	+ */
	927	+ bits = kzalloc(sizeof(*bits) + 1, GFP_KERNEL);
	928	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, bits);
	929	+
	930	+ /*
	931	+ * Below calls try to access bit within allocated memory; however, the
	932	+ * below accesses are still out-of-bounds, since bitops are defined to
	933	+ * operate on the whole long the bit is in.
	934	+ */
	935	+ kasan_bitops_modify(test, BITS_PER_LONG, bits);
	936	+
	937	+ /*
	938	+ * Below calls try to access bit beyond allocated memory.
	939	+ */
	940	+ kasan_bitops_test_and_modify(test, BITS_PER_LONG + BITS_PER_BYTE, bits);
	941	+
	942	+ kfree(bits);
	943	+}
	944	+
	945	+static void kasan_bitops_tags(struct kunit *test)
	946	+{
	947	+ long *bits;
	948	+
	949	+ /* This test is specifically crafted for tag-based modes. */
	950	+ KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC);
	951	+
	952	+ /* kmalloc-64 cache will be used and the last 16 bytes will be the redzone. */
	953	+ bits = kzalloc(48, GFP_KERNEL);
	954	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, bits);
	955	+
	956	+ /* Do the accesses past the 48 allocated bytes, but within the redone. */
	957	+ kasan_bitops_modify(test, BITS_PER_LONG, (void *)bits + 48);
	958	+ kasan_bitops_test_and_modify(test, BITS_PER_LONG + BITS_PER_BYTE, (void *)bits + 48);
	959	+
	960	+ kfree(bits);
	961	+}
	962	+
	963	+static void kmalloc_double_kzfree(struct kunit *test)
	964	+{
	965	+ char *ptr;
	966	+ size_t size = 16;
	967	+
	968	+ ptr = kmalloc(size, GFP_KERNEL);
	969	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
	970	+
	971	+ kfree_sensitive(ptr);
	972	+ KUNIT_EXPECT_KASAN_FAIL(test, kfree_sensitive(ptr));
	973	+}
	974	+
	975	+static void vmalloc_oob(struct kunit *test)
	976	+{
	977	+ void *area;
	978	+
	979	+ KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_VMALLOC);
	980	+
	981	+ /*
	982	+ * We have to be careful not to hit the guard page.
	983	+ * The MMU will catch that and crash us.
	984	+ */
	985	+ area = vmalloc(3000);
	986	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, area);
	987	+
	988	+ KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)area)[3100]);
	989	+ vfree(area);
	990	+}
	991	+
	992	+/*
	993	+ * Check that the assigned pointer tag falls within the [KASAN_TAG_MIN,
	994	+ * KASAN_TAG_KERNEL) range (note: excluding the match-all tag) for tag-based
	995	+ * modes.
	996	+ */
	997	+static void match_all_not_assigned(struct kunit *test)
	998	+{
	999	+ char *ptr;
	1000	+ struct page *pages;
	1001	+ int i, size, order;
	1002	+
	1003	+ KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC);
	1004	+
	1005	+ for (i = 0; i < 256; i++) {
	1006	+ size = (get_random_int() % 1024) + 1;
	1007	+ ptr = kmalloc(size, GFP_KERNEL);
	1008	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
	1009	+ KUNIT_EXPECT_GE(test, (u8)get_tag(ptr), (u8)KASAN_TAG_MIN);
	1010	+ KUNIT_EXPECT_LT(test, (u8)get_tag(ptr), (u8)KASAN_TAG_KERNEL);
	1011	+ kfree(ptr);
	1012	+ }
	1013	+
	1014	+ for (i = 0; i < 256; i++) {
	1015	+ order = (get_random_int() % 4) + 1;
	1016	+ pages = alloc_pages(GFP_KERNEL, order);
	1017	+ ptr = page_address(pages);
	1018	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
	1019	+ KUNIT_EXPECT_GE(test, (u8)get_tag(ptr), (u8)KASAN_TAG_MIN);
	1020	+ KUNIT_EXPECT_LT(test, (u8)get_tag(ptr), (u8)KASAN_TAG_KERNEL);
	1021	+ free_pages((unsigned long)ptr, order);
	1022	+ }
	1023	+}
	1024	+
	1025	+/* Check that 0xff works as a match-all pointer tag for tag-based modes. */
	1026	+static void match_all_ptr_tag(struct kunit *test)
	1027	+{
	1028	+ char *ptr;
	1029	+ u8 tag;
	1030	+
	1031	+ KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC);
	1032	+
	1033	+ ptr = kmalloc(128, GFP_KERNEL);
	1034	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
	1035	+
	1036	+ /* Backup the assigned tag. */
	1037	+ tag = get_tag(ptr);
	1038	+ KUNIT_EXPECT_NE(test, tag, (u8)KASAN_TAG_KERNEL);
	1039	+
	1040	+ /* Reset the tag to 0xff.*/
	1041	+ ptr = set_tag(ptr, KASAN_TAG_KERNEL);
	1042	+
	1043	+ /* This access shouldn't trigger a KASAN report. */
	1044	+ *ptr = 0;
	1045	+
	1046	+ /* Recover the pointer tag and free. */
	1047	+ ptr = set_tag(ptr, tag);
	1048	+ kfree(ptr);
	1049	+}
	1050	+
	1051	+/* Check that there are no match-all memory tags for tag-based modes. */
	1052	+static void match_all_mem_tag(struct kunit *test)
	1053	+{
	1054	+ char *ptr;
	1055	+ int tag;
	1056	+
	1057	+ KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC);
	1058	+
	1059	+ ptr = kmalloc(128, GFP_KERNEL);
	1060	+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
	1061	+ KUNIT_EXPECT_NE(test, (u8)get_tag(ptr), (u8)KASAN_TAG_KERNEL);
	1062	+
	1063	+ /* For each possible tag value not matching the pointer tag. */
	1064	+ for (tag = KASAN_TAG_MIN; tag <= KASAN_TAG_KERNEL; tag++) {
	1065	+ if (tag == get_tag(ptr))
	1066	+ continue;
	1067	+
	1068	+ /* Mark the first memory granule with the chosen memory tag. */
	1069	+ kasan_poison(ptr, KASAN_GRANULE_SIZE, (u8)tag, false);
	1070	+
	1071	+ /* This access must cause a KASAN report. */
	1072	+ KUNIT_EXPECT_KASAN_FAIL(test, *ptr = 0);
	1073	+ }
	1074	+
	1075	+ /* Recover the memory tag and free. */
	1076	+ kasan_poison(ptr, KASAN_GRANULE_SIZE, get_tag(ptr), false);
	1077	+ kfree(ptr);
	1078	+}
	1079	+
	1080	+static struct kunit_case kasan_kunit_test_cases[] = {
	1081	+ KUNIT_CASE(kmalloc_oob_right),
	1082	+ KUNIT_CASE(kmalloc_oob_left),
	1083	+ KUNIT_CASE(kmalloc_node_oob_right),
	1084	+ KUNIT_CASE(kmalloc_pagealloc_oob_right),
	1085	+ KUNIT_CASE(kmalloc_pagealloc_uaf),
	1086	+ KUNIT_CASE(kmalloc_pagealloc_invalid_free),
	1087	+ KUNIT_CASE(pagealloc_oob_right),
	1088	+ KUNIT_CASE(pagealloc_uaf),
	1089	+ KUNIT_CASE(kmalloc_large_oob_right),
	1090	+ KUNIT_CASE(krealloc_more_oob),
	1091	+ KUNIT_CASE(krealloc_less_oob),
	1092	+ KUNIT_CASE(krealloc_pagealloc_more_oob),
	1093	+ KUNIT_CASE(krealloc_pagealloc_less_oob),
	1094	+ KUNIT_CASE(krealloc_uaf),
	1095	+ KUNIT_CASE(kmalloc_oob_16),
	1096	+ KUNIT_CASE(kmalloc_uaf_16),
	1097	+ KUNIT_CASE(kmalloc_oob_in_memset),
	1098	+ KUNIT_CASE(kmalloc_oob_memset_2),
	1099	+ KUNIT_CASE(kmalloc_oob_memset_4),
	1100	+ KUNIT_CASE(kmalloc_oob_memset_8),
	1101	+ KUNIT_CASE(kmalloc_oob_memset_16),
	1102	+ KUNIT_CASE(kmalloc_memmove_invalid_size),
	1103	+ KUNIT_CASE(kmalloc_uaf),
	1104	+ KUNIT_CASE(kmalloc_uaf_memset),
	1105	+ KUNIT_CASE(kmalloc_uaf2),
	1106	+ KUNIT_CASE(kfree_via_page),
	1107	+ KUNIT_CASE(kfree_via_phys),
	1108	+ KUNIT_CASE(kmem_cache_oob),
	1109	+ KUNIT_CASE(kmem_cache_accounted),
	1110	+ KUNIT_CASE(kmem_cache_bulk),
	1111	+ KUNIT_CASE(kasan_global_oob),
	1112	+ KUNIT_CASE(kasan_stack_oob),
	1113	+ KUNIT_CASE(kasan_alloca_oob_left),
	1114	+ KUNIT_CASE(kasan_alloca_oob_right),
	1115	+ KUNIT_CASE(ksize_unpoisons_memory),
	1116	+ KUNIT_CASE(ksize_uaf),
	1117	+ KUNIT_CASE(kmem_cache_double_free),
	1118	+ KUNIT_CASE(kmem_cache_invalid_free),
	1119	+ KUNIT_CASE(kasan_memchr),
	1120	+ KUNIT_CASE(kasan_memcmp),
	1121	+ KUNIT_CASE(kasan_strings),
	1122	+ KUNIT_CASE(kasan_bitops_generic),
	1123	+ KUNIT_CASE(kasan_bitops_tags),
	1124	+ KUNIT_CASE(kmalloc_double_kzfree),
	1125	+ KUNIT_CASE(vmalloc_oob),
	1126	+ KUNIT_CASE(match_all_not_assigned),
	1127	+ KUNIT_CASE(match_all_ptr_tag),
	1128	+ KUNIT_CASE(match_all_mem_tag),
	1129	+ {}
	1130	+};
	1131	+
	1132	+static struct kunit_suite kasan_kunit_test_suite = {
	1133	+ .name = "kasan",
	1134	+ .init = kasan_test_init,
	1135	+ .test_cases = kasan_kunit_test_cases,
	1136	+ .exit = kasan_test_exit,
	1137	+};
	1138	+
	1139	+kunit_test_suite(kasan_kunit_test_suite);
	1140	+
675	1141	MODULE_LICENSE("GPL");