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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
3f15801c AR |
2 | /* |
3 | * | |
4 | * Copyright (c) 2014 Samsung Electronics Co., Ltd. | |
5 | * Author: Andrey Ryabinin <a.ryabinin@samsung.com> | |
3f15801c AR |
6 | */ |
7 | ||
19a33ca6 | 8 | #include <linux/bitops.h> |
0386bf38 | 9 | #include <linux/delay.h> |
19a33ca6 | 10 | #include <linux/kasan.h> |
3f15801c | 11 | #include <linux/kernel.h> |
eae08dca | 12 | #include <linux/mm.h> |
19a33ca6 ME |
13 | #include <linux/mman.h> |
14 | #include <linux/module.h> | |
3f15801c | 15 | #include <linux/printk.h> |
573a4809 | 16 | #include <linux/random.h> |
3f15801c AR |
17 | #include <linux/slab.h> |
18 | #include <linux/string.h> | |
eae08dca | 19 | #include <linux/uaccess.h> |
b92a953c | 20 | #include <linux/io.h> |
06513916 | 21 | #include <linux/vmalloc.h> |
b92a953c MR |
22 | |
23 | #include <asm/page.h> | |
3f15801c | 24 | |
83c4e7a0 PA |
25 | #include <kunit/test.h> |
26 | ||
f33a0149 WW |
27 | #include "../mm/kasan/kasan.h" |
28 | ||
1f600626 | 29 | #define OOB_TAG_OFF (IS_ENABLED(CONFIG_KASAN_GENERIC) ? 0 : KASAN_GRANULE_SIZE) |
f33a0149 | 30 | |
adb72ae1 | 31 | /* |
0fd37925 AK |
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. | |
adb72ae1 | 34 | */ |
adb72ae1 | 35 | void *kasan_ptr_result; |
83c4e7a0 PA |
36 | int kasan_int_result; |
37 | ||
38 | static struct kunit_resource resource; | |
39 | static struct kunit_kasan_expectation fail_data; | |
40 | static bool multishot; | |
41 | ||
0fd37925 AK |
42 | /* |
43 | * Temporarily enable multi-shot mode. Otherwise, KASAN would only report the | |
f05842cf AK |
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(). | |
0fd37925 | 47 | */ |
83c4e7a0 PA |
48 | static int kasan_test_init(struct kunit *test) |
49 | { | |
d82dc3a4 AK |
50 | if (!kasan_enabled()) { |
51 | kunit_err(test, "can't run KASAN tests with KASAN disabled"); | |
52 | return -1; | |
53 | } | |
54 | ||
83c4e7a0 | 55 | multishot = kasan_save_enable_multi_shot(); |
f05842cf | 56 | kasan_set_tagging_report_once(false); |
99734b53 | 57 | fail_data.report_found = false; |
99734b53 AK |
58 | kunit_add_named_resource(test, NULL, NULL, &resource, |
59 | "kasan_data", &fail_data); | |
83c4e7a0 PA |
60 | return 0; |
61 | } | |
62 | ||
63 | static void kasan_test_exit(struct kunit *test) | |
64 | { | |
f05842cf | 65 | kasan_set_tagging_report_once(true); |
83c4e7a0 | 66 | kasan_restore_multi_shot(multishot); |
99734b53 | 67 | KUNIT_EXPECT_FALSE(test, fail_data.report_found); |
83c4e7a0 PA |
68 | } |
69 | ||
70 | /** | |
0fd37925 AK |
71 | * KUNIT_EXPECT_KASAN_FAIL() - check that the executed expression produces a |
72 | * KASAN report; causes a test failure otherwise. This relies on a KUnit | |
73 | * resource named "kasan_data". Do not use this name for KUnit resources | |
74 | * outside of KASAN tests. | |
f05842cf | 75 | * |
e80a76aa AK |
76 | * For hardware tag-based KASAN in sync mode, when a tag fault happens, tag |
77 | * checking is auto-disabled. When this happens, this test handler reenables | |
78 | * tag checking. As tag checking can be only disabled or enabled per CPU, | |
79 | * this handler disables migration (preemption). | |
2e4bde6a AK |
80 | * |
81 | * Since the compiler doesn't see that the expression can change the fail_data | |
82 | * fields, it can reorder or optimize away the accesses to those fields. | |
83 | * Use READ/WRITE_ONCE() for the accesses and compiler barriers around the | |
84 | * expression to prevent that. | |
99734b53 AK |
85 | * |
86 | * In between KUNIT_EXPECT_KASAN_FAIL checks, fail_data.report_found is kept as | |
87 | * false. This allows detecting KASAN reports that happen outside of the checks | |
88 | * by asserting !fail_data.report_found at the start of KUNIT_EXPECT_KASAN_FAIL | |
89 | * and in kasan_test_exit. | |
83c4e7a0 | 90 | */ |
99734b53 AK |
91 | #define KUNIT_EXPECT_KASAN_FAIL(test, expression) do { \ |
92 | if (IS_ENABLED(CONFIG_KASAN_HW_TAGS) && \ | |
93 | !kasan_async_mode_enabled()) \ | |
94 | migrate_disable(); \ | |
95 | KUNIT_EXPECT_FALSE(test, READ_ONCE(fail_data.report_found)); \ | |
99734b53 AK |
96 | barrier(); \ |
97 | expression; \ | |
98 | barrier(); \ | |
3ff16d30 DG |
99 | if (!READ_ONCE(fail_data.report_found)) { \ |
100 | KUNIT_FAIL(test, KUNIT_SUBTEST_INDENT "KASAN failure " \ | |
101 | "expected in \"" #expression \ | |
102 | "\", but none occurred"); \ | |
103 | } \ | |
99734b53 AK |
104 | if (IS_ENABLED(CONFIG_KASAN_HW_TAGS)) { \ |
105 | if (READ_ONCE(fail_data.report_found)) \ | |
106 | kasan_enable_tagging_sync(); \ | |
107 | migrate_enable(); \ | |
108 | } \ | |
109 | WRITE_ONCE(fail_data.report_found, false); \ | |
83c4e7a0 PA |
110 | } while (0) |
111 | ||
da17e377 | 112 | #define KASAN_TEST_NEEDS_CONFIG_ON(test, config) do { \ |
40eb5cf4 ME |
113 | if (!IS_ENABLED(config)) \ |
114 | kunit_skip((test), "Test requires " #config "=y"); \ | |
da17e377 AK |
115 | } while (0) |
116 | ||
117 | #define KASAN_TEST_NEEDS_CONFIG_OFF(test, config) do { \ | |
40eb5cf4 ME |
118 | if (IS_ENABLED(config)) \ |
119 | kunit_skip((test), "Test requires " #config "=n"); \ | |
da17e377 AK |
120 | } while (0) |
121 | ||
73228c7e | 122 | static void kmalloc_oob_right(struct kunit *test) |
3f15801c AR |
123 | { |
124 | char *ptr; | |
125 | size_t size = 123; | |
126 | ||
3f15801c | 127 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 128 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
f33a0149 | 129 | |
73228c7e | 130 | KUNIT_EXPECT_KASAN_FAIL(test, ptr[size + OOB_TAG_OFF] = 'x'); |
3f15801c AR |
131 | kfree(ptr); |
132 | } | |
133 | ||
73228c7e | 134 | static void kmalloc_oob_left(struct kunit *test) |
3f15801c AR |
135 | { |
136 | char *ptr; | |
137 | size_t size = 15; | |
138 | ||
3f15801c | 139 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 140 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
3f15801c | 141 | |
73228c7e | 142 | KUNIT_EXPECT_KASAN_FAIL(test, *ptr = *(ptr - 1)); |
3f15801c AR |
143 | kfree(ptr); |
144 | } | |
145 | ||
73228c7e | 146 | static void kmalloc_node_oob_right(struct kunit *test) |
3f15801c AR |
147 | { |
148 | char *ptr; | |
149 | size_t size = 4096; | |
150 | ||
3f15801c | 151 | ptr = kmalloc_node(size, GFP_KERNEL, 0); |
73228c7e | 152 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
3f15801c | 153 | |
73228c7e | 154 | KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 0); |
3f15801c AR |
155 | kfree(ptr); |
156 | } | |
157 | ||
858bdeb0 AK |
158 | /* |
159 | * These kmalloc_pagealloc_* tests try allocating a memory chunk that doesn't | |
160 | * fit into a slab cache and therefore is allocated via the page allocator | |
161 | * fallback. Since this kind of fallback is only implemented for SLUB, these | |
162 | * tests are limited to that allocator. | |
163 | */ | |
73228c7e | 164 | static void kmalloc_pagealloc_oob_right(struct kunit *test) |
3f15801c AR |
165 | { |
166 | char *ptr; | |
167 | size_t size = KMALLOC_MAX_CACHE_SIZE + 10; | |
168 | ||
da17e377 | 169 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB); |
73228c7e | 170 | |
e6e8379c | 171 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 172 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
f33a0149 | 173 | |
73228c7e | 174 | KUNIT_EXPECT_KASAN_FAIL(test, ptr[size + OOB_TAG_OFF] = 0); |
858bdeb0 | 175 | |
e6e8379c AP |
176 | kfree(ptr); |
177 | } | |
47adccce | 178 | |
73228c7e | 179 | static void kmalloc_pagealloc_uaf(struct kunit *test) |
47adccce DV |
180 | { |
181 | char *ptr; | |
182 | size_t size = KMALLOC_MAX_CACHE_SIZE + 10; | |
183 | ||
da17e377 | 184 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB); |
47adccce | 185 | |
73228c7e PA |
186 | ptr = kmalloc(size, GFP_KERNEL); |
187 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
47adccce | 188 | kfree(ptr); |
858bdeb0 | 189 | |
73228c7e | 190 | KUNIT_EXPECT_KASAN_FAIL(test, ptr[0] = 0); |
47adccce DV |
191 | } |
192 | ||
73228c7e | 193 | static void kmalloc_pagealloc_invalid_free(struct kunit *test) |
47adccce DV |
194 | { |
195 | char *ptr; | |
196 | size_t size = KMALLOC_MAX_CACHE_SIZE + 10; | |
197 | ||
da17e377 | 198 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB); |
47adccce | 199 | |
73228c7e PA |
200 | ptr = kmalloc(size, GFP_KERNEL); |
201 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
202 | ||
203 | KUNIT_EXPECT_KASAN_FAIL(test, kfree(ptr + 1)); | |
47adccce | 204 | } |
e6e8379c | 205 | |
858bdeb0 AK |
206 | static void pagealloc_oob_right(struct kunit *test) |
207 | { | |
208 | char *ptr; | |
209 | struct page *pages; | |
210 | size_t order = 4; | |
211 | size_t size = (1UL << (PAGE_SHIFT + order)); | |
212 | ||
213 | /* | |
214 | * With generic KASAN page allocations have no redzones, thus | |
215 | * out-of-bounds detection is not guaranteed. | |
216 | * See https://bugzilla.kernel.org/show_bug.cgi?id=210503. | |
217 | */ | |
218 | KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC); | |
219 | ||
220 | pages = alloc_pages(GFP_KERNEL, order); | |
221 | ptr = page_address(pages); | |
222 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
223 | ||
224 | KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 0); | |
225 | free_pages((unsigned long)ptr, order); | |
226 | } | |
227 | ||
228 | static void pagealloc_uaf(struct kunit *test) | |
229 | { | |
230 | char *ptr; | |
231 | struct page *pages; | |
232 | size_t order = 4; | |
233 | ||
234 | pages = alloc_pages(GFP_KERNEL, order); | |
235 | ptr = page_address(pages); | |
236 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
237 | free_pages((unsigned long)ptr, order); | |
238 | ||
239 | KUNIT_EXPECT_KASAN_FAIL(test, ptr[0] = 0); | |
240 | } | |
241 | ||
73228c7e | 242 | static void kmalloc_large_oob_right(struct kunit *test) |
e6e8379c AP |
243 | { |
244 | char *ptr; | |
245 | size_t size = KMALLOC_MAX_CACHE_SIZE - 256; | |
0fd37925 AK |
246 | |
247 | /* | |
248 | * Allocate a chunk that is large enough, but still fits into a slab | |
e6e8379c AP |
249 | * and does not trigger the page allocator fallback in SLUB. |
250 | */ | |
3f15801c | 251 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 252 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
3f15801c | 253 | |
73228c7e | 254 | KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 0); |
3f15801c AR |
255 | kfree(ptr); |
256 | } | |
257 | ||
b87c28b9 AK |
258 | static void krealloc_more_oob_helper(struct kunit *test, |
259 | size_t size1, size_t size2) | |
3f15801c AR |
260 | { |
261 | char *ptr1, *ptr2; | |
b87c28b9 AK |
262 | size_t middle; |
263 | ||
264 | KUNIT_ASSERT_LT(test, size1, size2); | |
265 | middle = size1 + (size2 - size1) / 2; | |
3f15801c | 266 | |
3f15801c | 267 | ptr1 = kmalloc(size1, GFP_KERNEL); |
73228c7e | 268 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); |
3f15801c | 269 | |
73228c7e PA |
270 | ptr2 = krealloc(ptr1, size2, GFP_KERNEL); |
271 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2); | |
f33a0149 | 272 | |
b87c28b9 AK |
273 | /* All offsets up to size2 must be accessible. */ |
274 | ptr2[size1 - 1] = 'x'; | |
275 | ptr2[size1] = 'x'; | |
276 | ptr2[middle] = 'x'; | |
277 | ptr2[size2 - 1] = 'x'; | |
278 | ||
279 | /* Generic mode is precise, so unaligned size2 must be inaccessible. */ | |
280 | if (IS_ENABLED(CONFIG_KASAN_GENERIC)) | |
281 | KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size2] = 'x'); | |
282 | ||
283 | /* For all modes first aligned offset after size2 must be inaccessible. */ | |
284 | KUNIT_EXPECT_KASAN_FAIL(test, | |
285 | ptr2[round_up(size2, KASAN_GRANULE_SIZE)] = 'x'); | |
286 | ||
3f15801c AR |
287 | kfree(ptr2); |
288 | } | |
289 | ||
b87c28b9 AK |
290 | static void krealloc_less_oob_helper(struct kunit *test, |
291 | size_t size1, size_t size2) | |
3f15801c AR |
292 | { |
293 | char *ptr1, *ptr2; | |
b87c28b9 AK |
294 | size_t middle; |
295 | ||
296 | KUNIT_ASSERT_LT(test, size2, size1); | |
297 | middle = size2 + (size1 - size2) / 2; | |
3f15801c | 298 | |
3f15801c | 299 | ptr1 = kmalloc(size1, GFP_KERNEL); |
73228c7e | 300 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); |
f33a0149 | 301 | |
73228c7e PA |
302 | ptr2 = krealloc(ptr1, size2, GFP_KERNEL); |
303 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2); | |
f33a0149 | 304 | |
b87c28b9 AK |
305 | /* Must be accessible for all modes. */ |
306 | ptr2[size2 - 1] = 'x'; | |
307 | ||
308 | /* Generic mode is precise, so unaligned size2 must be inaccessible. */ | |
309 | if (IS_ENABLED(CONFIG_KASAN_GENERIC)) | |
310 | KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size2] = 'x'); | |
311 | ||
312 | /* For all modes first aligned offset after size2 must be inaccessible. */ | |
313 | KUNIT_EXPECT_KASAN_FAIL(test, | |
314 | ptr2[round_up(size2, KASAN_GRANULE_SIZE)] = 'x'); | |
315 | ||
316 | /* | |
317 | * For all modes all size2, middle, and size1 should land in separate | |
318 | * granules and thus the latter two offsets should be inaccessible. | |
319 | */ | |
320 | KUNIT_EXPECT_LE(test, round_up(size2, KASAN_GRANULE_SIZE), | |
321 | round_down(middle, KASAN_GRANULE_SIZE)); | |
322 | KUNIT_EXPECT_LE(test, round_up(middle, KASAN_GRANULE_SIZE), | |
323 | round_down(size1, KASAN_GRANULE_SIZE)); | |
324 | KUNIT_EXPECT_KASAN_FAIL(test, ptr2[middle] = 'x'); | |
325 | KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size1 - 1] = 'x'); | |
326 | KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size1] = 'x'); | |
327 | ||
3f15801c AR |
328 | kfree(ptr2); |
329 | } | |
330 | ||
b87c28b9 AK |
331 | static void krealloc_more_oob(struct kunit *test) |
332 | { | |
333 | krealloc_more_oob_helper(test, 201, 235); | |
334 | } | |
335 | ||
336 | static void krealloc_less_oob(struct kunit *test) | |
337 | { | |
338 | krealloc_less_oob_helper(test, 235, 201); | |
339 | } | |
340 | ||
341 | static void krealloc_pagealloc_more_oob(struct kunit *test) | |
342 | { | |
343 | /* page_alloc fallback in only implemented for SLUB. */ | |
344 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB); | |
345 | ||
346 | krealloc_more_oob_helper(test, KMALLOC_MAX_CACHE_SIZE + 201, | |
347 | KMALLOC_MAX_CACHE_SIZE + 235); | |
348 | } | |
349 | ||
350 | static void krealloc_pagealloc_less_oob(struct kunit *test) | |
351 | { | |
352 | /* page_alloc fallback in only implemented for SLUB. */ | |
353 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB); | |
354 | ||
355 | krealloc_less_oob_helper(test, KMALLOC_MAX_CACHE_SIZE + 235, | |
356 | KMALLOC_MAX_CACHE_SIZE + 201); | |
357 | } | |
358 | ||
26a5ca7a AK |
359 | /* |
360 | * Check that krealloc() detects a use-after-free, returns NULL, | |
361 | * and doesn't unpoison the freed object. | |
362 | */ | |
363 | static void krealloc_uaf(struct kunit *test) | |
364 | { | |
365 | char *ptr1, *ptr2; | |
366 | int size1 = 201; | |
367 | int size2 = 235; | |
368 | ||
369 | ptr1 = kmalloc(size1, GFP_KERNEL); | |
370 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); | |
371 | kfree(ptr1); | |
372 | ||
373 | KUNIT_EXPECT_KASAN_FAIL(test, ptr2 = krealloc(ptr1, size2, GFP_KERNEL)); | |
374 | KUNIT_ASSERT_PTR_EQ(test, (void *)ptr2, NULL); | |
375 | KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)ptr1); | |
376 | } | |
377 | ||
73228c7e | 378 | static void kmalloc_oob_16(struct kunit *test) |
3f15801c AR |
379 | { |
380 | struct { | |
381 | u64 words[2]; | |
382 | } *ptr1, *ptr2; | |
383 | ||
58b999d7 | 384 | /* This test is specifically crafted for the generic mode. */ |
da17e377 | 385 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC); |
58b999d7 | 386 | |
3f15801c | 387 | ptr1 = kmalloc(sizeof(*ptr1) - 3, GFP_KERNEL); |
73228c7e PA |
388 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); |
389 | ||
3f15801c | 390 | ptr2 = kmalloc(sizeof(*ptr2), GFP_KERNEL); |
73228c7e PA |
391 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2); |
392 | ||
393 | KUNIT_EXPECT_KASAN_FAIL(test, *ptr1 = *ptr2); | |
3f15801c AR |
394 | kfree(ptr1); |
395 | kfree(ptr2); | |
396 | } | |
397 | ||
58b999d7 AK |
398 | static void kmalloc_uaf_16(struct kunit *test) |
399 | { | |
400 | struct { | |
401 | u64 words[2]; | |
402 | } *ptr1, *ptr2; | |
403 | ||
404 | ptr1 = kmalloc(sizeof(*ptr1), GFP_KERNEL); | |
405 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); | |
406 | ||
407 | ptr2 = kmalloc(sizeof(*ptr2), GFP_KERNEL); | |
408 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2); | |
409 | kfree(ptr2); | |
410 | ||
411 | KUNIT_EXPECT_KASAN_FAIL(test, *ptr1 = *ptr2); | |
412 | kfree(ptr1); | |
413 | } | |
414 | ||
73228c7e | 415 | static void kmalloc_oob_memset_2(struct kunit *test) |
f523e737 WL |
416 | { |
417 | char *ptr; | |
418 | size_t size = 8; | |
419 | ||
f523e737 | 420 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 421 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
f33a0149 | 422 | |
73228c7e | 423 | KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + 7 + OOB_TAG_OFF, 0, 2)); |
f523e737 WL |
424 | kfree(ptr); |
425 | } | |
426 | ||
73228c7e | 427 | static void kmalloc_oob_memset_4(struct kunit *test) |
f523e737 WL |
428 | { |
429 | char *ptr; | |
430 | size_t size = 8; | |
431 | ||
f523e737 | 432 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 433 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
f33a0149 | 434 | |
73228c7e | 435 | KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + 5 + OOB_TAG_OFF, 0, 4)); |
f523e737 WL |
436 | kfree(ptr); |
437 | } | |
438 | ||
439 | ||
73228c7e | 440 | static void kmalloc_oob_memset_8(struct kunit *test) |
f523e737 WL |
441 | { |
442 | char *ptr; | |
443 | size_t size = 8; | |
444 | ||
f523e737 | 445 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 446 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
f33a0149 | 447 | |
73228c7e | 448 | KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + 1 + OOB_TAG_OFF, 0, 8)); |
f523e737 WL |
449 | kfree(ptr); |
450 | } | |
451 | ||
73228c7e | 452 | static void kmalloc_oob_memset_16(struct kunit *test) |
f523e737 WL |
453 | { |
454 | char *ptr; | |
455 | size_t size = 16; | |
456 | ||
f523e737 | 457 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 458 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
f33a0149 | 459 | |
73228c7e | 460 | KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + 1 + OOB_TAG_OFF, 0, 16)); |
f523e737 WL |
461 | kfree(ptr); |
462 | } | |
463 | ||
73228c7e | 464 | static void kmalloc_oob_in_memset(struct kunit *test) |
3f15801c AR |
465 | { |
466 | char *ptr; | |
467 | size_t size = 666; | |
468 | ||
3f15801c | 469 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 470 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
f33a0149 | 471 | |
73228c7e | 472 | KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr, 0, size + 5 + OOB_TAG_OFF)); |
3f15801c AR |
473 | kfree(ptr); |
474 | } | |
475 | ||
73228c7e | 476 | static void kmalloc_memmove_invalid_size(struct kunit *test) |
98f3b56f WW |
477 | { |
478 | char *ptr; | |
479 | size_t size = 64; | |
480 | volatile size_t invalid_size = -2; | |
481 | ||
98f3b56f | 482 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 483 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
98f3b56f WW |
484 | |
485 | memset((char *)ptr, 0, 64); | |
73228c7e PA |
486 | |
487 | KUNIT_EXPECT_KASAN_FAIL(test, | |
488 | memmove((char *)ptr, (char *)ptr + 4, invalid_size)); | |
98f3b56f WW |
489 | kfree(ptr); |
490 | } | |
491 | ||
73228c7e | 492 | static void kmalloc_uaf(struct kunit *test) |
3f15801c AR |
493 | { |
494 | char *ptr; | |
495 | size_t size = 10; | |
496 | ||
3f15801c | 497 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 498 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
3f15801c AR |
499 | |
500 | kfree(ptr); | |
73228c7e | 501 | KUNIT_EXPECT_KASAN_FAIL(test, *(ptr + 8) = 'x'); |
3f15801c AR |
502 | } |
503 | ||
73228c7e | 504 | static void kmalloc_uaf_memset(struct kunit *test) |
3f15801c AR |
505 | { |
506 | char *ptr; | |
507 | size_t size = 33; | |
508 | ||
3f15801c | 509 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 510 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
3f15801c AR |
511 | |
512 | kfree(ptr); | |
73228c7e | 513 | KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr, 0, size)); |
3f15801c AR |
514 | } |
515 | ||
73228c7e | 516 | static void kmalloc_uaf2(struct kunit *test) |
3f15801c AR |
517 | { |
518 | char *ptr1, *ptr2; | |
519 | size_t size = 43; | |
1b1df4c4 | 520 | int counter = 0; |
3f15801c | 521 | |
1b1df4c4 | 522 | again: |
3f15801c | 523 | ptr1 = kmalloc(size, GFP_KERNEL); |
73228c7e | 524 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); |
3f15801c AR |
525 | |
526 | kfree(ptr1); | |
73228c7e | 527 | |
3f15801c | 528 | ptr2 = kmalloc(size, GFP_KERNEL); |
73228c7e PA |
529 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2); |
530 | ||
1b1df4c4 AK |
531 | /* |
532 | * For tag-based KASAN ptr1 and ptr2 tags might happen to be the same. | |
533 | * Allow up to 16 attempts at generating different tags. | |
534 | */ | |
535 | if (!IS_ENABLED(CONFIG_KASAN_GENERIC) && ptr1 == ptr2 && counter++ < 16) { | |
536 | kfree(ptr2); | |
537 | goto again; | |
538 | } | |
539 | ||
73228c7e PA |
540 | KUNIT_EXPECT_KASAN_FAIL(test, ptr1[40] = 'x'); |
541 | KUNIT_EXPECT_PTR_NE(test, ptr1, ptr2); | |
3f15801c | 542 | |
3f15801c AR |
543 | kfree(ptr2); |
544 | } | |
545 | ||
73228c7e | 546 | static void kfree_via_page(struct kunit *test) |
b92a953c MR |
547 | { |
548 | char *ptr; | |
549 | size_t size = 8; | |
550 | struct page *page; | |
551 | unsigned long offset; | |
552 | ||
b92a953c | 553 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 554 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
b92a953c MR |
555 | |
556 | page = virt_to_page(ptr); | |
557 | offset = offset_in_page(ptr); | |
558 | kfree(page_address(page) + offset); | |
559 | } | |
560 | ||
73228c7e | 561 | static void kfree_via_phys(struct kunit *test) |
b92a953c MR |
562 | { |
563 | char *ptr; | |
564 | size_t size = 8; | |
565 | phys_addr_t phys; | |
566 | ||
b92a953c | 567 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 568 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
b92a953c MR |
569 | |
570 | phys = virt_to_phys(ptr); | |
571 | kfree(phys_to_virt(phys)); | |
572 | } | |
573 | ||
73228c7e | 574 | static void kmem_cache_oob(struct kunit *test) |
3f15801c AR |
575 | { |
576 | char *p; | |
577 | size_t size = 200; | |
11516135 AK |
578 | struct kmem_cache *cache; |
579 | ||
580 | cache = kmem_cache_create("test_cache", size, 0, 0, NULL); | |
73228c7e | 581 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); |
11516135 | 582 | |
3f15801c AR |
583 | p = kmem_cache_alloc(cache, GFP_KERNEL); |
584 | if (!p) { | |
73228c7e | 585 | kunit_err(test, "Allocation failed: %s\n", __func__); |
3f15801c AR |
586 | kmem_cache_destroy(cache); |
587 | return; | |
588 | } | |
589 | ||
73228c7e | 590 | KUNIT_EXPECT_KASAN_FAIL(test, *p = p[size + OOB_TAG_OFF]); |
11516135 | 591 | |
3f15801c AR |
592 | kmem_cache_free(cache, p); |
593 | kmem_cache_destroy(cache); | |
594 | } | |
595 | ||
11516135 | 596 | static void kmem_cache_accounted(struct kunit *test) |
0386bf38 GT |
597 | { |
598 | int i; | |
599 | char *p; | |
600 | size_t size = 200; | |
601 | struct kmem_cache *cache; | |
602 | ||
603 | cache = kmem_cache_create("test_cache", size, 0, SLAB_ACCOUNT, NULL); | |
73228c7e | 604 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); |
0386bf38 | 605 | |
0386bf38 GT |
606 | /* |
607 | * Several allocations with a delay to allow for lazy per memcg kmem | |
608 | * cache creation. | |
609 | */ | |
610 | for (i = 0; i < 5; i++) { | |
611 | p = kmem_cache_alloc(cache, GFP_KERNEL); | |
dc2bf000 | 612 | if (!p) |
0386bf38 | 613 | goto free_cache; |
dc2bf000 | 614 | |
0386bf38 GT |
615 | kmem_cache_free(cache, p); |
616 | msleep(100); | |
617 | } | |
618 | ||
619 | free_cache: | |
620 | kmem_cache_destroy(cache); | |
621 | } | |
622 | ||
11516135 AK |
623 | static void kmem_cache_bulk(struct kunit *test) |
624 | { | |
625 | struct kmem_cache *cache; | |
626 | size_t size = 200; | |
627 | char *p[10]; | |
628 | bool ret; | |
629 | int i; | |
630 | ||
631 | cache = kmem_cache_create("test_cache", size, 0, 0, NULL); | |
632 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); | |
633 | ||
634 | ret = kmem_cache_alloc_bulk(cache, GFP_KERNEL, ARRAY_SIZE(p), (void **)&p); | |
635 | if (!ret) { | |
636 | kunit_err(test, "Allocation failed: %s\n", __func__); | |
637 | kmem_cache_destroy(cache); | |
638 | return; | |
639 | } | |
640 | ||
641 | for (i = 0; i < ARRAY_SIZE(p); i++) | |
642 | p[i][0] = p[i][size - 1] = 42; | |
643 | ||
644 | kmem_cache_free_bulk(cache, ARRAY_SIZE(p), (void **)&p); | |
645 | kmem_cache_destroy(cache); | |
646 | } | |
647 | ||
3f15801c AR |
648 | static char global_array[10]; |
649 | ||
73228c7e | 650 | static void kasan_global_oob(struct kunit *test) |
3f15801c | 651 | { |
f649dc0e PC |
652 | /* |
653 | * Deliberate out-of-bounds access. To prevent CONFIG_UBSAN_LOCAL_BOUNDS | |
654 | * from failing here and panicing the kernel, access the array via a | |
655 | * volatile pointer, which will prevent the compiler from being able to | |
656 | * determine the array bounds. | |
657 | * | |
658 | * This access uses a volatile pointer to char (char *volatile) rather | |
659 | * than the more conventional pointer to volatile char (volatile char *) | |
660 | * because we want to prevent the compiler from making inferences about | |
661 | * the pointer itself (i.e. its array bounds), not the data that it | |
662 | * refers to. | |
663 | */ | |
664 | char *volatile array = global_array; | |
665 | char *p = &array[ARRAY_SIZE(global_array) + 3]; | |
3f15801c | 666 | |
58b999d7 | 667 | /* Only generic mode instruments globals. */ |
da17e377 | 668 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC); |
58b999d7 | 669 | |
73228c7e | 670 | KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p); |
3f15801c AR |
671 | } |
672 | ||
611806b4 | 673 | /* Check that ksize() makes the whole object accessible. */ |
73228c7e | 674 | static void ksize_unpoisons_memory(struct kunit *test) |
96fe805f AP |
675 | { |
676 | char *ptr; | |
48c23239 | 677 | size_t size = 123, real_size; |
96fe805f | 678 | |
96fe805f | 679 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 680 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
96fe805f | 681 | real_size = ksize(ptr); |
0fd37925 AK |
682 | |
683 | /* This access shouldn't trigger a KASAN report. */ | |
96fe805f | 684 | ptr[size] = 'x'; |
0fd37925 AK |
685 | |
686 | /* This one must. */ | |
73228c7e | 687 | KUNIT_EXPECT_KASAN_FAIL(test, ptr[real_size] = 'y'); |
0fd37925 | 688 | |
96fe805f AP |
689 | kfree(ptr); |
690 | } | |
691 | ||
611806b4 AK |
692 | /* |
693 | * Check that a use-after-free is detected by ksize() and via normal accesses | |
694 | * after it. | |
695 | */ | |
696 | static void ksize_uaf(struct kunit *test) | |
697 | { | |
698 | char *ptr; | |
699 | int size = 128 - KASAN_GRANULE_SIZE; | |
700 | ||
701 | ptr = kmalloc(size, GFP_KERNEL); | |
702 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
703 | kfree(ptr); | |
704 | ||
705 | KUNIT_EXPECT_KASAN_FAIL(test, ksize(ptr)); | |
706 | KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = *ptr); | |
707 | KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = *(ptr + size)); | |
708 | } | |
709 | ||
73228c7e | 710 | static void kasan_stack_oob(struct kunit *test) |
eae08dca | 711 | { |
73228c7e | 712 | char stack_array[10]; |
f649dc0e PC |
713 | /* See comment in kasan_global_oob. */ |
714 | char *volatile array = stack_array; | |
715 | char *p = &array[ARRAY_SIZE(stack_array) + OOB_TAG_OFF]; | |
eae08dca | 716 | |
da17e377 | 717 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_STACK); |
eae08dca | 718 | |
73228c7e | 719 | KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p); |
eae08dca AR |
720 | } |
721 | ||
73228c7e | 722 | static void kasan_alloca_oob_left(struct kunit *test) |
00a14294 PL |
723 | { |
724 | volatile int i = 10; | |
725 | char alloca_array[i]; | |
f649dc0e PC |
726 | /* See comment in kasan_global_oob. */ |
727 | char *volatile array = alloca_array; | |
728 | char *p = array - 1; | |
00a14294 | 729 | |
58b999d7 | 730 | /* Only generic mode instruments dynamic allocas. */ |
da17e377 AK |
731 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC); |
732 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_STACK); | |
73228c7e PA |
733 | |
734 | KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p); | |
00a14294 PL |
735 | } |
736 | ||
73228c7e | 737 | static void kasan_alloca_oob_right(struct kunit *test) |
00a14294 PL |
738 | { |
739 | volatile int i = 10; | |
740 | char alloca_array[i]; | |
f649dc0e PC |
741 | /* See comment in kasan_global_oob. */ |
742 | char *volatile array = alloca_array; | |
743 | char *p = array + i; | |
00a14294 | 744 | |
58b999d7 | 745 | /* Only generic mode instruments dynamic allocas. */ |
da17e377 AK |
746 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC); |
747 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_STACK); | |
73228c7e PA |
748 | |
749 | KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p); | |
00a14294 PL |
750 | } |
751 | ||
73228c7e | 752 | static void kmem_cache_double_free(struct kunit *test) |
b1d57289 DV |
753 | { |
754 | char *p; | |
755 | size_t size = 200; | |
756 | struct kmem_cache *cache; | |
757 | ||
758 | cache = kmem_cache_create("test_cache", size, 0, 0, NULL); | |
73228c7e PA |
759 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); |
760 | ||
b1d57289 DV |
761 | p = kmem_cache_alloc(cache, GFP_KERNEL); |
762 | if (!p) { | |
73228c7e | 763 | kunit_err(test, "Allocation failed: %s\n", __func__); |
b1d57289 DV |
764 | kmem_cache_destroy(cache); |
765 | return; | |
766 | } | |
767 | ||
768 | kmem_cache_free(cache, p); | |
73228c7e | 769 | KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_free(cache, p)); |
b1d57289 DV |
770 | kmem_cache_destroy(cache); |
771 | } | |
772 | ||
73228c7e | 773 | static void kmem_cache_invalid_free(struct kunit *test) |
b1d57289 DV |
774 | { |
775 | char *p; | |
776 | size_t size = 200; | |
777 | struct kmem_cache *cache; | |
778 | ||
779 | cache = kmem_cache_create("test_cache", size, 0, SLAB_TYPESAFE_BY_RCU, | |
780 | NULL); | |
73228c7e PA |
781 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); |
782 | ||
b1d57289 DV |
783 | p = kmem_cache_alloc(cache, GFP_KERNEL); |
784 | if (!p) { | |
73228c7e | 785 | kunit_err(test, "Allocation failed: %s\n", __func__); |
b1d57289 DV |
786 | kmem_cache_destroy(cache); |
787 | return; | |
788 | } | |
789 | ||
0fd37925 | 790 | /* Trigger invalid free, the object doesn't get freed. */ |
73228c7e | 791 | KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_free(cache, p + 1)); |
91c93ed0 AK |
792 | |
793 | /* | |
794 | * Properly free the object to prevent the "Objects remaining in | |
795 | * test_cache on __kmem_cache_shutdown" BUG failure. | |
796 | */ | |
797 | kmem_cache_free(cache, p); | |
798 | ||
b1d57289 DV |
799 | kmem_cache_destroy(cache); |
800 | } | |
801 | ||
73228c7e | 802 | static void kasan_memchr(struct kunit *test) |
0c96350a AR |
803 | { |
804 | char *ptr; | |
805 | size_t size = 24; | |
806 | ||
0fd37925 AK |
807 | /* |
808 | * str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT. | |
809 | * See https://bugzilla.kernel.org/show_bug.cgi?id=206337 for details. | |
810 | */ | |
da17e377 | 811 | KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_AMD_MEM_ENCRYPT); |
73228c7e | 812 | |
58b999d7 AK |
813 | if (OOB_TAG_OFF) |
814 | size = round_up(size, OOB_TAG_OFF); | |
815 | ||
73228c7e PA |
816 | ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO); |
817 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
818 | ||
819 | KUNIT_EXPECT_KASAN_FAIL(test, | |
820 | kasan_ptr_result = memchr(ptr, '1', size + 1)); | |
0c96350a | 821 | |
0c96350a AR |
822 | kfree(ptr); |
823 | } | |
824 | ||
73228c7e | 825 | static void kasan_memcmp(struct kunit *test) |
0c96350a AR |
826 | { |
827 | char *ptr; | |
828 | size_t size = 24; | |
829 | int arr[9]; | |
830 | ||
0fd37925 AK |
831 | /* |
832 | * str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT. | |
833 | * See https://bugzilla.kernel.org/show_bug.cgi?id=206337 for details. | |
834 | */ | |
da17e377 | 835 | KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_AMD_MEM_ENCRYPT); |
0c96350a | 836 | |
58b999d7 AK |
837 | if (OOB_TAG_OFF) |
838 | size = round_up(size, OOB_TAG_OFF); | |
839 | ||
73228c7e PA |
840 | ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO); |
841 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
0c96350a | 842 | memset(arr, 0, sizeof(arr)); |
73228c7e PA |
843 | |
844 | KUNIT_EXPECT_KASAN_FAIL(test, | |
845 | kasan_int_result = memcmp(ptr, arr, size+1)); | |
0c96350a AR |
846 | kfree(ptr); |
847 | } | |
848 | ||
73228c7e | 849 | static void kasan_strings(struct kunit *test) |
0c96350a AR |
850 | { |
851 | char *ptr; | |
852 | size_t size = 24; | |
853 | ||
0fd37925 AK |
854 | /* |
855 | * str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT. | |
856 | * See https://bugzilla.kernel.org/show_bug.cgi?id=206337 for details. | |
857 | */ | |
da17e377 | 858 | KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_AMD_MEM_ENCRYPT); |
73228c7e PA |
859 | |
860 | ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO); | |
861 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
0c96350a AR |
862 | |
863 | kfree(ptr); | |
864 | ||
865 | /* | |
866 | * Try to cause only 1 invalid access (less spam in dmesg). | |
867 | * For that we need ptr to point to zeroed byte. | |
868 | * Skip metadata that could be stored in freed object so ptr | |
869 | * will likely point to zeroed byte. | |
870 | */ | |
871 | ptr += 16; | |
73228c7e | 872 | KUNIT_EXPECT_KASAN_FAIL(test, kasan_ptr_result = strchr(ptr, '1')); |
0c96350a | 873 | |
73228c7e | 874 | KUNIT_EXPECT_KASAN_FAIL(test, kasan_ptr_result = strrchr(ptr, '1')); |
0c96350a | 875 | |
73228c7e | 876 | KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strcmp(ptr, "2")); |
0c96350a | 877 | |
73228c7e | 878 | KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strncmp(ptr, "2", 1)); |
0c96350a | 879 | |
73228c7e | 880 | KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strlen(ptr)); |
0c96350a | 881 | |
73228c7e | 882 | KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strnlen(ptr, 1)); |
0c96350a AR |
883 | } |
884 | ||
58b999d7 AK |
885 | static void kasan_bitops_modify(struct kunit *test, int nr, void *addr) |
886 | { | |
887 | KUNIT_EXPECT_KASAN_FAIL(test, set_bit(nr, addr)); | |
888 | KUNIT_EXPECT_KASAN_FAIL(test, __set_bit(nr, addr)); | |
889 | KUNIT_EXPECT_KASAN_FAIL(test, clear_bit(nr, addr)); | |
890 | KUNIT_EXPECT_KASAN_FAIL(test, __clear_bit(nr, addr)); | |
891 | KUNIT_EXPECT_KASAN_FAIL(test, clear_bit_unlock(nr, addr)); | |
892 | KUNIT_EXPECT_KASAN_FAIL(test, __clear_bit_unlock(nr, addr)); | |
893 | KUNIT_EXPECT_KASAN_FAIL(test, change_bit(nr, addr)); | |
894 | KUNIT_EXPECT_KASAN_FAIL(test, __change_bit(nr, addr)); | |
895 | } | |
896 | ||
897 | static void kasan_bitops_test_and_modify(struct kunit *test, int nr, void *addr) | |
898 | { | |
899 | KUNIT_EXPECT_KASAN_FAIL(test, test_and_set_bit(nr, addr)); | |
900 | KUNIT_EXPECT_KASAN_FAIL(test, __test_and_set_bit(nr, addr)); | |
901 | KUNIT_EXPECT_KASAN_FAIL(test, test_and_set_bit_lock(nr, addr)); | |
902 | KUNIT_EXPECT_KASAN_FAIL(test, test_and_clear_bit(nr, addr)); | |
903 | KUNIT_EXPECT_KASAN_FAIL(test, __test_and_clear_bit(nr, addr)); | |
904 | KUNIT_EXPECT_KASAN_FAIL(test, test_and_change_bit(nr, addr)); | |
905 | KUNIT_EXPECT_KASAN_FAIL(test, __test_and_change_bit(nr, addr)); | |
906 | KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = test_bit(nr, addr)); | |
907 | ||
908 | #if defined(clear_bit_unlock_is_negative_byte) | |
909 | KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = | |
910 | clear_bit_unlock_is_negative_byte(nr, addr)); | |
911 | #endif | |
912 | } | |
913 | ||
914 | static void kasan_bitops_generic(struct kunit *test) | |
19a33ca6 | 915 | { |
58b999d7 AK |
916 | long *bits; |
917 | ||
918 | /* This test is specifically crafted for the generic mode. */ | |
da17e377 | 919 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC); |
58b999d7 | 920 | |
19a33ca6 | 921 | /* |
0fd37925 | 922 | * Allocate 1 more byte, which causes kzalloc to round up to 16 bytes; |
19a33ca6 ME |
923 | * this way we do not actually corrupt other memory. |
924 | */ | |
58b999d7 | 925 | bits = kzalloc(sizeof(*bits) + 1, GFP_KERNEL); |
73228c7e | 926 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, bits); |
19a33ca6 ME |
927 | |
928 | /* | |
929 | * Below calls try to access bit within allocated memory; however, the | |
930 | * below accesses are still out-of-bounds, since bitops are defined to | |
931 | * operate on the whole long the bit is in. | |
932 | */ | |
58b999d7 | 933 | kasan_bitops_modify(test, BITS_PER_LONG, bits); |
19a33ca6 ME |
934 | |
935 | /* | |
936 | * Below calls try to access bit beyond allocated memory. | |
937 | */ | |
58b999d7 | 938 | kasan_bitops_test_and_modify(test, BITS_PER_LONG + BITS_PER_BYTE, bits); |
19a33ca6 | 939 | |
58b999d7 AK |
940 | kfree(bits); |
941 | } | |
19a33ca6 | 942 | |
58b999d7 AK |
943 | static void kasan_bitops_tags(struct kunit *test) |
944 | { | |
945 | long *bits; | |
19a33ca6 | 946 | |
da17e377 AK |
947 | /* This test is specifically crafted for tag-based modes. */ |
948 | KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC); | |
19a33ca6 | 949 | |
e66e1799 AK |
950 | /* kmalloc-64 cache will be used and the last 16 bytes will be the redzone. */ |
951 | bits = kzalloc(48, GFP_KERNEL); | |
58b999d7 | 952 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, bits); |
19a33ca6 | 953 | |
e66e1799 AK |
954 | /* Do the accesses past the 48 allocated bytes, but within the redone. */ |
955 | kasan_bitops_modify(test, BITS_PER_LONG, (void *)bits + 48); | |
956 | kasan_bitops_test_and_modify(test, BITS_PER_LONG + BITS_PER_BYTE, (void *)bits + 48); | |
19a33ca6 | 957 | |
19a33ca6 ME |
958 | kfree(bits); |
959 | } | |
960 | ||
73228c7e | 961 | static void kmalloc_double_kzfree(struct kunit *test) |
bb104ed7 ME |
962 | { |
963 | char *ptr; | |
964 | size_t size = 16; | |
965 | ||
bb104ed7 | 966 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 967 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
bb104ed7 | 968 | |
453431a5 | 969 | kfree_sensitive(ptr); |
73228c7e | 970 | KUNIT_EXPECT_KASAN_FAIL(test, kfree_sensitive(ptr)); |
bb104ed7 ME |
971 | } |
972 | ||
73228c7e | 973 | static void vmalloc_oob(struct kunit *test) |
06513916 DA |
974 | { |
975 | void *area; | |
976 | ||
da17e377 | 977 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_VMALLOC); |
06513916 DA |
978 | |
979 | /* | |
980 | * We have to be careful not to hit the guard page. | |
981 | * The MMU will catch that and crash us. | |
982 | */ | |
983 | area = vmalloc(3000); | |
73228c7e | 984 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, area); |
06513916 | 985 | |
73228c7e | 986 | KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)area)[3100]); |
06513916 DA |
987 | vfree(area); |
988 | } | |
387d6e46 | 989 | |
573a4809 AK |
990 | /* |
991 | * Check that the assigned pointer tag falls within the [KASAN_TAG_MIN, | |
992 | * KASAN_TAG_KERNEL) range (note: excluding the match-all tag) for tag-based | |
993 | * modes. | |
994 | */ | |
995 | static void match_all_not_assigned(struct kunit *test) | |
996 | { | |
997 | char *ptr; | |
998 | struct page *pages; | |
999 | int i, size, order; | |
1000 | ||
1001 | KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC); | |
1002 | ||
1003 | for (i = 0; i < 256; i++) { | |
1004 | size = (get_random_int() % 1024) + 1; | |
1005 | ptr = kmalloc(size, GFP_KERNEL); | |
1006 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
1007 | KUNIT_EXPECT_GE(test, (u8)get_tag(ptr), (u8)KASAN_TAG_MIN); | |
1008 | KUNIT_EXPECT_LT(test, (u8)get_tag(ptr), (u8)KASAN_TAG_KERNEL); | |
1009 | kfree(ptr); | |
1010 | } | |
1011 | ||
1012 | for (i = 0; i < 256; i++) { | |
1013 | order = (get_random_int() % 4) + 1; | |
1014 | pages = alloc_pages(GFP_KERNEL, order); | |
1015 | ptr = page_address(pages); | |
1016 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
1017 | KUNIT_EXPECT_GE(test, (u8)get_tag(ptr), (u8)KASAN_TAG_MIN); | |
1018 | KUNIT_EXPECT_LT(test, (u8)get_tag(ptr), (u8)KASAN_TAG_KERNEL); | |
1019 | free_pages((unsigned long)ptr, order); | |
1020 | } | |
1021 | } | |
1022 | ||
1023 | /* Check that 0xff works as a match-all pointer tag for tag-based modes. */ | |
1024 | static void match_all_ptr_tag(struct kunit *test) | |
1025 | { | |
1026 | char *ptr; | |
1027 | u8 tag; | |
1028 | ||
1029 | KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC); | |
1030 | ||
1031 | ptr = kmalloc(128, GFP_KERNEL); | |
1032 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
1033 | ||
1034 | /* Backup the assigned tag. */ | |
1035 | tag = get_tag(ptr); | |
1036 | KUNIT_EXPECT_NE(test, tag, (u8)KASAN_TAG_KERNEL); | |
1037 | ||
1038 | /* Reset the tag to 0xff.*/ | |
1039 | ptr = set_tag(ptr, KASAN_TAG_KERNEL); | |
1040 | ||
1041 | /* This access shouldn't trigger a KASAN report. */ | |
1042 | *ptr = 0; | |
1043 | ||
1044 | /* Recover the pointer tag and free. */ | |
1045 | ptr = set_tag(ptr, tag); | |
1046 | kfree(ptr); | |
1047 | } | |
1048 | ||
1049 | /* Check that there are no match-all memory tags for tag-based modes. */ | |
1050 | static void match_all_mem_tag(struct kunit *test) | |
1051 | { | |
1052 | char *ptr; | |
1053 | int tag; | |
1054 | ||
1055 | KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC); | |
1056 | ||
1057 | ptr = kmalloc(128, GFP_KERNEL); | |
1058 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
1059 | KUNIT_EXPECT_NE(test, (u8)get_tag(ptr), (u8)KASAN_TAG_KERNEL); | |
1060 | ||
1061 | /* For each possible tag value not matching the pointer tag. */ | |
1062 | for (tag = KASAN_TAG_MIN; tag <= KASAN_TAG_KERNEL; tag++) { | |
1063 | if (tag == get_tag(ptr)) | |
1064 | continue; | |
1065 | ||
1066 | /* Mark the first memory granule with the chosen memory tag. */ | |
aa5c219c | 1067 | kasan_poison(ptr, KASAN_GRANULE_SIZE, (u8)tag, false); |
573a4809 AK |
1068 | |
1069 | /* This access must cause a KASAN report. */ | |
1070 | KUNIT_EXPECT_KASAN_FAIL(test, *ptr = 0); | |
1071 | } | |
1072 | ||
1073 | /* Recover the memory tag and free. */ | |
aa5c219c | 1074 | kasan_poison(ptr, KASAN_GRANULE_SIZE, get_tag(ptr), false); |
573a4809 AK |
1075 | kfree(ptr); |
1076 | } | |
1077 | ||
73228c7e PA |
1078 | static struct kunit_case kasan_kunit_test_cases[] = { |
1079 | KUNIT_CASE(kmalloc_oob_right), | |
1080 | KUNIT_CASE(kmalloc_oob_left), | |
1081 | KUNIT_CASE(kmalloc_node_oob_right), | |
1082 | KUNIT_CASE(kmalloc_pagealloc_oob_right), | |
1083 | KUNIT_CASE(kmalloc_pagealloc_uaf), | |
1084 | KUNIT_CASE(kmalloc_pagealloc_invalid_free), | |
858bdeb0 AK |
1085 | KUNIT_CASE(pagealloc_oob_right), |
1086 | KUNIT_CASE(pagealloc_uaf), | |
73228c7e | 1087 | KUNIT_CASE(kmalloc_large_oob_right), |
b87c28b9 AK |
1088 | KUNIT_CASE(krealloc_more_oob), |
1089 | KUNIT_CASE(krealloc_less_oob), | |
1090 | KUNIT_CASE(krealloc_pagealloc_more_oob), | |
1091 | KUNIT_CASE(krealloc_pagealloc_less_oob), | |
26a5ca7a | 1092 | KUNIT_CASE(krealloc_uaf), |
73228c7e | 1093 | KUNIT_CASE(kmalloc_oob_16), |
58b999d7 | 1094 | KUNIT_CASE(kmalloc_uaf_16), |
73228c7e PA |
1095 | KUNIT_CASE(kmalloc_oob_in_memset), |
1096 | KUNIT_CASE(kmalloc_oob_memset_2), | |
1097 | KUNIT_CASE(kmalloc_oob_memset_4), | |
1098 | KUNIT_CASE(kmalloc_oob_memset_8), | |
1099 | KUNIT_CASE(kmalloc_oob_memset_16), | |
1100 | KUNIT_CASE(kmalloc_memmove_invalid_size), | |
1101 | KUNIT_CASE(kmalloc_uaf), | |
1102 | KUNIT_CASE(kmalloc_uaf_memset), | |
1103 | KUNIT_CASE(kmalloc_uaf2), | |
1104 | KUNIT_CASE(kfree_via_page), | |
1105 | KUNIT_CASE(kfree_via_phys), | |
1106 | KUNIT_CASE(kmem_cache_oob), | |
11516135 AK |
1107 | KUNIT_CASE(kmem_cache_accounted), |
1108 | KUNIT_CASE(kmem_cache_bulk), | |
73228c7e PA |
1109 | KUNIT_CASE(kasan_global_oob), |
1110 | KUNIT_CASE(kasan_stack_oob), | |
1111 | KUNIT_CASE(kasan_alloca_oob_left), | |
1112 | KUNIT_CASE(kasan_alloca_oob_right), | |
1113 | KUNIT_CASE(ksize_unpoisons_memory), | |
611806b4 | 1114 | KUNIT_CASE(ksize_uaf), |
73228c7e PA |
1115 | KUNIT_CASE(kmem_cache_double_free), |
1116 | KUNIT_CASE(kmem_cache_invalid_free), | |
1117 | KUNIT_CASE(kasan_memchr), | |
1118 | KUNIT_CASE(kasan_memcmp), | |
1119 | KUNIT_CASE(kasan_strings), | |
58b999d7 AK |
1120 | KUNIT_CASE(kasan_bitops_generic), |
1121 | KUNIT_CASE(kasan_bitops_tags), | |
73228c7e PA |
1122 | KUNIT_CASE(kmalloc_double_kzfree), |
1123 | KUNIT_CASE(vmalloc_oob), | |
573a4809 AK |
1124 | KUNIT_CASE(match_all_not_assigned), |
1125 | KUNIT_CASE(match_all_ptr_tag), | |
1126 | KUNIT_CASE(match_all_mem_tag), | |
73228c7e PA |
1127 | {} |
1128 | }; | |
1129 | ||
1130 | static struct kunit_suite kasan_kunit_test_suite = { | |
1131 | .name = "kasan", | |
1132 | .init = kasan_test_init, | |
1133 | .test_cases = kasan_kunit_test_cases, | |
1134 | .exit = kasan_test_exit, | |
1135 | }; | |
1136 | ||
1137 | kunit_test_suite(kasan_kunit_test_suite); | |
3f15801c | 1138 | |
3f15801c | 1139 | MODULE_LICENSE("GPL"); |