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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> |
1a2473f0 | 22 | #include <linux/set_memory.h> |
b92a953c MR |
23 | |
24 | #include <asm/page.h> | |
3f15801c | 25 | |
83c4e7a0 PA |
26 | #include <kunit/test.h> |
27 | ||
f33a0149 WW |
28 | #include "../mm/kasan/kasan.h" |
29 | ||
1f600626 | 30 | #define OOB_TAG_OFF (IS_ENABLED(CONFIG_KASAN_GENERIC) ? 0 : KASAN_GRANULE_SIZE) |
f33a0149 | 31 | |
adb72ae1 | 32 | /* |
0fd37925 AK |
33 | * Some tests use these global variables to store return values from function |
34 | * calls that could otherwise be eliminated by the compiler as dead code. | |
adb72ae1 | 35 | */ |
adb72ae1 | 36 | void *kasan_ptr_result; |
83c4e7a0 PA |
37 | int kasan_int_result; |
38 | ||
39 | static struct kunit_resource resource; | |
ed6d7444 | 40 | static struct kunit_kasan_status test_status; |
83c4e7a0 PA |
41 | static bool multishot; |
42 | ||
0fd37925 AK |
43 | /* |
44 | * Temporarily enable multi-shot mode. Otherwise, KASAN would only report the | |
f05842cf AK |
45 | * first detected bug and panic the kernel if panic_on_warn is enabled. For |
46 | * hardware tag-based KASAN also allow tag checking to be reenabled for each | |
47 | * test, see the comment for KUNIT_EXPECT_KASAN_FAIL(). | |
0fd37925 | 48 | */ |
83c4e7a0 PA |
49 | static int kasan_test_init(struct kunit *test) |
50 | { | |
d82dc3a4 AK |
51 | if (!kasan_enabled()) { |
52 | kunit_err(test, "can't run KASAN tests with KASAN disabled"); | |
53 | return -1; | |
54 | } | |
55 | ||
83c4e7a0 | 56 | multishot = kasan_save_enable_multi_shot(); |
ed6d7444 AK |
57 | test_status.report_found = false; |
58 | test_status.sync_fault = false; | |
99734b53 | 59 | kunit_add_named_resource(test, NULL, NULL, &resource, |
ed6d7444 | 60 | "kasan_status", &test_status); |
83c4e7a0 PA |
61 | return 0; |
62 | } | |
63 | ||
64 | static void kasan_test_exit(struct kunit *test) | |
65 | { | |
66 | kasan_restore_multi_shot(multishot); | |
ed6d7444 | 67 | KUNIT_EXPECT_FALSE(test, test_status.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 | |
ed6d7444 | 73 | * resource named "kasan_status". Do not use this name for KUnit resources |
0fd37925 | 74 | * outside of KASAN tests. |
f05842cf | 75 | * |
ed6d7444 | 76 | * For hardware tag-based KASAN, when a synchronous tag fault happens, tag |
e80a76aa AK |
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 | 80 | * |
ed6d7444 | 81 | * Since the compiler doesn't see that the expression can change the test_status |
2e4bde6a AK |
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 | 85 | * |
ed6d7444 AK |
86 | * In between KUNIT_EXPECT_KASAN_FAIL checks, test_status.report_found is kept |
87 | * as false. This allows detecting KASAN reports that happen outside of the | |
88 | * checks by asserting !test_status.report_found at the start of | |
89 | * KUNIT_EXPECT_KASAN_FAIL 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) && \ | |
2d27e585 | 93 | kasan_sync_fault_possible()) \ |
99734b53 | 94 | migrate_disable(); \ |
ed6d7444 | 95 | KUNIT_EXPECT_FALSE(test, READ_ONCE(test_status.report_found)); \ |
99734b53 AK |
96 | barrier(); \ |
97 | expression; \ | |
98 | barrier(); \ | |
ed6d7444 AK |
99 | if (kasan_async_fault_possible()) \ |
100 | kasan_force_async_fault(); \ | |
101 | if (!READ_ONCE(test_status.report_found)) { \ | |
3ff16d30 DG |
102 | KUNIT_FAIL(test, KUNIT_SUBTEST_INDENT "KASAN failure " \ |
103 | "expected in \"" #expression \ | |
104 | "\", but none occurred"); \ | |
105 | } \ | |
ed6d7444 AK |
106 | if (IS_ENABLED(CONFIG_KASAN_HW_TAGS) && \ |
107 | kasan_sync_fault_possible()) { \ | |
108 | if (READ_ONCE(test_status.report_found) && \ | |
109 | READ_ONCE(test_status.sync_fault)) \ | |
110 | kasan_enable_tagging(); \ | |
99734b53 AK |
111 | migrate_enable(); \ |
112 | } \ | |
ed6d7444 | 113 | WRITE_ONCE(test_status.report_found, false); \ |
83c4e7a0 PA |
114 | } while (0) |
115 | ||
da17e377 | 116 | #define KASAN_TEST_NEEDS_CONFIG_ON(test, config) do { \ |
40eb5cf4 ME |
117 | if (!IS_ENABLED(config)) \ |
118 | kunit_skip((test), "Test requires " #config "=y"); \ | |
da17e377 AK |
119 | } while (0) |
120 | ||
121 | #define KASAN_TEST_NEEDS_CONFIG_OFF(test, config) do { \ | |
40eb5cf4 ME |
122 | if (IS_ENABLED(config)) \ |
123 | kunit_skip((test), "Test requires " #config "=n"); \ | |
da17e377 AK |
124 | } while (0) |
125 | ||
73228c7e | 126 | static void kmalloc_oob_right(struct kunit *test) |
3f15801c AR |
127 | { |
128 | char *ptr; | |
ab512805 | 129 | size_t size = 128 - KASAN_GRANULE_SIZE - 5; |
3f15801c | 130 | |
3f15801c | 131 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 132 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
f33a0149 | 133 | |
ab512805 AK |
134 | /* |
135 | * An unaligned access past the requested kmalloc size. | |
136 | * Only generic KASAN can precisely detect these. | |
137 | */ | |
138 | if (IS_ENABLED(CONFIG_KASAN_GENERIC)) | |
139 | KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 'x'); | |
140 | ||
141 | /* | |
142 | * An aligned access into the first out-of-bounds granule that falls | |
143 | * within the aligned kmalloc object. | |
144 | */ | |
145 | KUNIT_EXPECT_KASAN_FAIL(test, ptr[size + 5] = 'y'); | |
146 | ||
147 | /* Out-of-bounds access past the aligned kmalloc object. */ | |
148 | KUNIT_EXPECT_KASAN_FAIL(test, ptr[0] = | |
149 | ptr[size + KASAN_GRANULE_SIZE + 5]); | |
150 | ||
3f15801c AR |
151 | kfree(ptr); |
152 | } | |
153 | ||
73228c7e | 154 | static void kmalloc_oob_left(struct kunit *test) |
3f15801c AR |
155 | { |
156 | char *ptr; | |
157 | size_t size = 15; | |
158 | ||
3f15801c | 159 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 160 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
3f15801c | 161 | |
73228c7e | 162 | KUNIT_EXPECT_KASAN_FAIL(test, *ptr = *(ptr - 1)); |
3f15801c AR |
163 | kfree(ptr); |
164 | } | |
165 | ||
73228c7e | 166 | static void kmalloc_node_oob_right(struct kunit *test) |
3f15801c AR |
167 | { |
168 | char *ptr; | |
169 | size_t size = 4096; | |
170 | ||
3f15801c | 171 | ptr = kmalloc_node(size, GFP_KERNEL, 0); |
73228c7e | 172 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
3f15801c | 173 | |
8fbad19b | 174 | KUNIT_EXPECT_KASAN_FAIL(test, ptr[0] = ptr[size]); |
3f15801c AR |
175 | kfree(ptr); |
176 | } | |
177 | ||
858bdeb0 AK |
178 | /* |
179 | * These kmalloc_pagealloc_* tests try allocating a memory chunk that doesn't | |
180 | * fit into a slab cache and therefore is allocated via the page allocator | |
181 | * fallback. Since this kind of fallback is only implemented for SLUB, these | |
182 | * tests are limited to that allocator. | |
183 | */ | |
73228c7e | 184 | static void kmalloc_pagealloc_oob_right(struct kunit *test) |
3f15801c AR |
185 | { |
186 | char *ptr; | |
187 | size_t size = KMALLOC_MAX_CACHE_SIZE + 10; | |
188 | ||
da17e377 | 189 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB); |
73228c7e | 190 | |
e6e8379c | 191 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 192 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
f33a0149 | 193 | |
73228c7e | 194 | KUNIT_EXPECT_KASAN_FAIL(test, ptr[size + OOB_TAG_OFF] = 0); |
858bdeb0 | 195 | |
e6e8379c AP |
196 | kfree(ptr); |
197 | } | |
47adccce | 198 | |
73228c7e | 199 | static void kmalloc_pagealloc_uaf(struct kunit *test) |
47adccce DV |
200 | { |
201 | char *ptr; | |
202 | size_t size = KMALLOC_MAX_CACHE_SIZE + 10; | |
203 | ||
da17e377 | 204 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB); |
47adccce | 205 | |
73228c7e PA |
206 | ptr = kmalloc(size, GFP_KERNEL); |
207 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
47adccce | 208 | kfree(ptr); |
858bdeb0 | 209 | |
8fbad19b | 210 | KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[0]); |
47adccce DV |
211 | } |
212 | ||
73228c7e | 213 | static void kmalloc_pagealloc_invalid_free(struct kunit *test) |
47adccce DV |
214 | { |
215 | char *ptr; | |
216 | size_t size = KMALLOC_MAX_CACHE_SIZE + 10; | |
217 | ||
da17e377 | 218 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB); |
47adccce | 219 | |
73228c7e PA |
220 | ptr = kmalloc(size, GFP_KERNEL); |
221 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
222 | ||
223 | KUNIT_EXPECT_KASAN_FAIL(test, kfree(ptr + 1)); | |
47adccce | 224 | } |
e6e8379c | 225 | |
858bdeb0 AK |
226 | static void pagealloc_oob_right(struct kunit *test) |
227 | { | |
228 | char *ptr; | |
229 | struct page *pages; | |
230 | size_t order = 4; | |
231 | size_t size = (1UL << (PAGE_SHIFT + order)); | |
232 | ||
233 | /* | |
234 | * With generic KASAN page allocations have no redzones, thus | |
235 | * out-of-bounds detection is not guaranteed. | |
236 | * See https://bugzilla.kernel.org/show_bug.cgi?id=210503. | |
237 | */ | |
238 | KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC); | |
239 | ||
240 | pages = alloc_pages(GFP_KERNEL, order); | |
241 | ptr = page_address(pages); | |
242 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
243 | ||
8fbad19b | 244 | KUNIT_EXPECT_KASAN_FAIL(test, ptr[0] = ptr[size]); |
858bdeb0 AK |
245 | free_pages((unsigned long)ptr, order); |
246 | } | |
247 | ||
248 | static void pagealloc_uaf(struct kunit *test) | |
249 | { | |
250 | char *ptr; | |
251 | struct page *pages; | |
252 | size_t order = 4; | |
253 | ||
254 | pages = alloc_pages(GFP_KERNEL, order); | |
255 | ptr = page_address(pages); | |
256 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
257 | free_pages((unsigned long)ptr, order); | |
258 | ||
8fbad19b | 259 | KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[0]); |
858bdeb0 AK |
260 | } |
261 | ||
73228c7e | 262 | static void kmalloc_large_oob_right(struct kunit *test) |
e6e8379c AP |
263 | { |
264 | char *ptr; | |
265 | size_t size = KMALLOC_MAX_CACHE_SIZE - 256; | |
0fd37925 AK |
266 | |
267 | /* | |
268 | * Allocate a chunk that is large enough, but still fits into a slab | |
e6e8379c AP |
269 | * and does not trigger the page allocator fallback in SLUB. |
270 | */ | |
3f15801c | 271 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 272 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
3f15801c | 273 | |
73228c7e | 274 | KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 0); |
3f15801c AR |
275 | kfree(ptr); |
276 | } | |
277 | ||
b87c28b9 AK |
278 | static void krealloc_more_oob_helper(struct kunit *test, |
279 | size_t size1, size_t size2) | |
3f15801c AR |
280 | { |
281 | char *ptr1, *ptr2; | |
b87c28b9 AK |
282 | size_t middle; |
283 | ||
284 | KUNIT_ASSERT_LT(test, size1, size2); | |
285 | middle = size1 + (size2 - size1) / 2; | |
3f15801c | 286 | |
3f15801c | 287 | ptr1 = kmalloc(size1, GFP_KERNEL); |
73228c7e | 288 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); |
3f15801c | 289 | |
73228c7e PA |
290 | ptr2 = krealloc(ptr1, size2, GFP_KERNEL); |
291 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2); | |
f33a0149 | 292 | |
b87c28b9 AK |
293 | /* All offsets up to size2 must be accessible. */ |
294 | ptr2[size1 - 1] = 'x'; | |
295 | ptr2[size1] = 'x'; | |
296 | ptr2[middle] = 'x'; | |
297 | ptr2[size2 - 1] = 'x'; | |
298 | ||
299 | /* Generic mode is precise, so unaligned size2 must be inaccessible. */ | |
300 | if (IS_ENABLED(CONFIG_KASAN_GENERIC)) | |
301 | KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size2] = 'x'); | |
302 | ||
303 | /* For all modes first aligned offset after size2 must be inaccessible. */ | |
304 | KUNIT_EXPECT_KASAN_FAIL(test, | |
305 | ptr2[round_up(size2, KASAN_GRANULE_SIZE)] = 'x'); | |
306 | ||
3f15801c AR |
307 | kfree(ptr2); |
308 | } | |
309 | ||
b87c28b9 AK |
310 | static void krealloc_less_oob_helper(struct kunit *test, |
311 | size_t size1, size_t size2) | |
3f15801c AR |
312 | { |
313 | char *ptr1, *ptr2; | |
b87c28b9 AK |
314 | size_t middle; |
315 | ||
316 | KUNIT_ASSERT_LT(test, size2, size1); | |
317 | middle = size2 + (size1 - size2) / 2; | |
3f15801c | 318 | |
3f15801c | 319 | ptr1 = kmalloc(size1, GFP_KERNEL); |
73228c7e | 320 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); |
f33a0149 | 321 | |
73228c7e PA |
322 | ptr2 = krealloc(ptr1, size2, GFP_KERNEL); |
323 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2); | |
f33a0149 | 324 | |
b87c28b9 AK |
325 | /* Must be accessible for all modes. */ |
326 | ptr2[size2 - 1] = 'x'; | |
327 | ||
328 | /* Generic mode is precise, so unaligned size2 must be inaccessible. */ | |
329 | if (IS_ENABLED(CONFIG_KASAN_GENERIC)) | |
330 | KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size2] = 'x'); | |
331 | ||
332 | /* For all modes first aligned offset after size2 must be inaccessible. */ | |
333 | KUNIT_EXPECT_KASAN_FAIL(test, | |
334 | ptr2[round_up(size2, KASAN_GRANULE_SIZE)] = 'x'); | |
335 | ||
336 | /* | |
337 | * For all modes all size2, middle, and size1 should land in separate | |
338 | * granules and thus the latter two offsets should be inaccessible. | |
339 | */ | |
340 | KUNIT_EXPECT_LE(test, round_up(size2, KASAN_GRANULE_SIZE), | |
341 | round_down(middle, KASAN_GRANULE_SIZE)); | |
342 | KUNIT_EXPECT_LE(test, round_up(middle, KASAN_GRANULE_SIZE), | |
343 | round_down(size1, KASAN_GRANULE_SIZE)); | |
344 | KUNIT_EXPECT_KASAN_FAIL(test, ptr2[middle] = 'x'); | |
345 | KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size1 - 1] = 'x'); | |
346 | KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size1] = 'x'); | |
347 | ||
3f15801c AR |
348 | kfree(ptr2); |
349 | } | |
350 | ||
b87c28b9 AK |
351 | static void krealloc_more_oob(struct kunit *test) |
352 | { | |
353 | krealloc_more_oob_helper(test, 201, 235); | |
354 | } | |
355 | ||
356 | static void krealloc_less_oob(struct kunit *test) | |
357 | { | |
358 | krealloc_less_oob_helper(test, 235, 201); | |
359 | } | |
360 | ||
361 | static void krealloc_pagealloc_more_oob(struct kunit *test) | |
362 | { | |
363 | /* page_alloc fallback in only implemented for SLUB. */ | |
364 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB); | |
365 | ||
366 | krealloc_more_oob_helper(test, KMALLOC_MAX_CACHE_SIZE + 201, | |
367 | KMALLOC_MAX_CACHE_SIZE + 235); | |
368 | } | |
369 | ||
370 | static void krealloc_pagealloc_less_oob(struct kunit *test) | |
371 | { | |
372 | /* page_alloc fallback in only implemented for SLUB. */ | |
373 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB); | |
374 | ||
375 | krealloc_less_oob_helper(test, KMALLOC_MAX_CACHE_SIZE + 235, | |
376 | KMALLOC_MAX_CACHE_SIZE + 201); | |
377 | } | |
378 | ||
26a5ca7a AK |
379 | /* |
380 | * Check that krealloc() detects a use-after-free, returns NULL, | |
381 | * and doesn't unpoison the freed object. | |
382 | */ | |
383 | static void krealloc_uaf(struct kunit *test) | |
384 | { | |
385 | char *ptr1, *ptr2; | |
386 | int size1 = 201; | |
387 | int size2 = 235; | |
388 | ||
389 | ptr1 = kmalloc(size1, GFP_KERNEL); | |
390 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); | |
391 | kfree(ptr1); | |
392 | ||
393 | KUNIT_EXPECT_KASAN_FAIL(test, ptr2 = krealloc(ptr1, size2, GFP_KERNEL)); | |
ccad78f1 | 394 | KUNIT_ASSERT_NULL(test, ptr2); |
26a5ca7a AK |
395 | KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)ptr1); |
396 | } | |
397 | ||
73228c7e | 398 | static void kmalloc_oob_16(struct kunit *test) |
3f15801c AR |
399 | { |
400 | struct { | |
401 | u64 words[2]; | |
402 | } *ptr1, *ptr2; | |
403 | ||
58b999d7 | 404 | /* This test is specifically crafted for the generic mode. */ |
da17e377 | 405 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC); |
58b999d7 | 406 | |
3f15801c | 407 | ptr1 = kmalloc(sizeof(*ptr1) - 3, GFP_KERNEL); |
73228c7e PA |
408 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); |
409 | ||
3f15801c | 410 | ptr2 = kmalloc(sizeof(*ptr2), GFP_KERNEL); |
73228c7e PA |
411 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2); |
412 | ||
413 | KUNIT_EXPECT_KASAN_FAIL(test, *ptr1 = *ptr2); | |
3f15801c AR |
414 | kfree(ptr1); |
415 | kfree(ptr2); | |
416 | } | |
417 | ||
58b999d7 AK |
418 | static void kmalloc_uaf_16(struct kunit *test) |
419 | { | |
420 | struct { | |
421 | u64 words[2]; | |
422 | } *ptr1, *ptr2; | |
423 | ||
424 | ptr1 = kmalloc(sizeof(*ptr1), GFP_KERNEL); | |
425 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); | |
426 | ||
427 | ptr2 = kmalloc(sizeof(*ptr2), GFP_KERNEL); | |
428 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2); | |
429 | kfree(ptr2); | |
430 | ||
431 | KUNIT_EXPECT_KASAN_FAIL(test, *ptr1 = *ptr2); | |
432 | kfree(ptr1); | |
433 | } | |
434 | ||
555999a0 AK |
435 | /* |
436 | * Note: in the memset tests below, the written range touches both valid and | |
437 | * invalid memory. This makes sure that the instrumentation does not only check | |
438 | * the starting address but the whole range. | |
439 | */ | |
440 | ||
73228c7e | 441 | static void kmalloc_oob_memset_2(struct kunit *test) |
f523e737 WL |
442 | { |
443 | char *ptr; | |
555999a0 | 444 | size_t size = 128 - KASAN_GRANULE_SIZE; |
f523e737 | 445 | |
f523e737 | 446 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 447 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
f33a0149 | 448 | |
d73dad4e | 449 | OPTIMIZER_HIDE_VAR(size); |
555999a0 | 450 | KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + size - 1, 0, 2)); |
f523e737 WL |
451 | kfree(ptr); |
452 | } | |
453 | ||
73228c7e | 454 | static void kmalloc_oob_memset_4(struct kunit *test) |
f523e737 WL |
455 | { |
456 | char *ptr; | |
555999a0 | 457 | size_t size = 128 - KASAN_GRANULE_SIZE; |
f523e737 | 458 | |
f523e737 | 459 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 460 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
f33a0149 | 461 | |
d73dad4e | 462 | OPTIMIZER_HIDE_VAR(size); |
555999a0 | 463 | KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + size - 3, 0, 4)); |
f523e737 WL |
464 | kfree(ptr); |
465 | } | |
466 | ||
73228c7e | 467 | static void kmalloc_oob_memset_8(struct kunit *test) |
f523e737 WL |
468 | { |
469 | char *ptr; | |
555999a0 | 470 | size_t size = 128 - KASAN_GRANULE_SIZE; |
f523e737 | 471 | |
f523e737 | 472 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 473 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
f33a0149 | 474 | |
d73dad4e | 475 | OPTIMIZER_HIDE_VAR(size); |
555999a0 | 476 | KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + size - 7, 0, 8)); |
f523e737 WL |
477 | kfree(ptr); |
478 | } | |
479 | ||
73228c7e | 480 | static void kmalloc_oob_memset_16(struct kunit *test) |
f523e737 WL |
481 | { |
482 | char *ptr; | |
555999a0 | 483 | size_t size = 128 - KASAN_GRANULE_SIZE; |
f523e737 | 484 | |
f523e737 | 485 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 486 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
f33a0149 | 487 | |
d73dad4e | 488 | OPTIMIZER_HIDE_VAR(size); |
555999a0 | 489 | KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + size - 15, 0, 16)); |
f523e737 WL |
490 | kfree(ptr); |
491 | } | |
492 | ||
73228c7e | 493 | static void kmalloc_oob_in_memset(struct kunit *test) |
3f15801c AR |
494 | { |
495 | char *ptr; | |
555999a0 | 496 | size_t size = 128 - KASAN_GRANULE_SIZE; |
3f15801c | 497 | |
3f15801c | 498 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 499 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
f33a0149 | 500 | |
09c6304e | 501 | OPTIMIZER_HIDE_VAR(ptr); |
d73dad4e | 502 | OPTIMIZER_HIDE_VAR(size); |
555999a0 AK |
503 | KUNIT_EXPECT_KASAN_FAIL(test, |
504 | memset(ptr, 0, size + KASAN_GRANULE_SIZE)); | |
3f15801c AR |
505 | kfree(ptr); |
506 | } | |
507 | ||
758cabae | 508 | static void kmalloc_memmove_negative_size(struct kunit *test) |
98f3b56f WW |
509 | { |
510 | char *ptr; | |
511 | size_t size = 64; | |
d73dad4e | 512 | size_t invalid_size = -2; |
98f3b56f | 513 | |
1b0668be AK |
514 | /* |
515 | * Hardware tag-based mode doesn't check memmove for negative size. | |
516 | * As a result, this test introduces a side-effect memory corruption, | |
517 | * which can result in a crash. | |
518 | */ | |
519 | KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_HW_TAGS); | |
520 | ||
98f3b56f | 521 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 522 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
98f3b56f WW |
523 | |
524 | memset((char *)ptr, 0, 64); | |
09c6304e | 525 | OPTIMIZER_HIDE_VAR(ptr); |
d73dad4e | 526 | OPTIMIZER_HIDE_VAR(invalid_size); |
73228c7e PA |
527 | KUNIT_EXPECT_KASAN_FAIL(test, |
528 | memmove((char *)ptr, (char *)ptr + 4, invalid_size)); | |
98f3b56f WW |
529 | kfree(ptr); |
530 | } | |
531 | ||
758cabae PC |
532 | static void kmalloc_memmove_invalid_size(struct kunit *test) |
533 | { | |
534 | char *ptr; | |
535 | size_t size = 64; | |
536 | volatile size_t invalid_size = size; | |
537 | ||
538 | ptr = kmalloc(size, GFP_KERNEL); | |
539 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
540 | ||
98f3b56f | 541 | memset((char *)ptr, 0, 64); |
09c6304e | 542 | OPTIMIZER_HIDE_VAR(ptr); |
73228c7e PA |
543 | KUNIT_EXPECT_KASAN_FAIL(test, |
544 | memmove((char *)ptr, (char *)ptr + 4, invalid_size)); | |
98f3b56f WW |
545 | kfree(ptr); |
546 | } | |
547 | ||
73228c7e | 548 | static void kmalloc_uaf(struct kunit *test) |
3f15801c AR |
549 | { |
550 | char *ptr; | |
551 | size_t size = 10; | |
552 | ||
3f15801c | 553 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 554 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
3f15801c AR |
555 | |
556 | kfree(ptr); | |
8fbad19b | 557 | KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[8]); |
3f15801c AR |
558 | } |
559 | ||
73228c7e | 560 | static void kmalloc_uaf_memset(struct kunit *test) |
3f15801c AR |
561 | { |
562 | char *ptr; | |
563 | size_t size = 33; | |
564 | ||
25b12a58 AK |
565 | /* |
566 | * Only generic KASAN uses quarantine, which is required to avoid a | |
567 | * kernel memory corruption this test causes. | |
568 | */ | |
569 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC); | |
570 | ||
3f15801c | 571 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 572 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
3f15801c AR |
573 | |
574 | kfree(ptr); | |
73228c7e | 575 | KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr, 0, size)); |
3f15801c AR |
576 | } |
577 | ||
73228c7e | 578 | static void kmalloc_uaf2(struct kunit *test) |
3f15801c AR |
579 | { |
580 | char *ptr1, *ptr2; | |
581 | size_t size = 43; | |
1b1df4c4 | 582 | int counter = 0; |
3f15801c | 583 | |
1b1df4c4 | 584 | again: |
3f15801c | 585 | ptr1 = kmalloc(size, GFP_KERNEL); |
73228c7e | 586 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); |
3f15801c AR |
587 | |
588 | kfree(ptr1); | |
73228c7e | 589 | |
3f15801c | 590 | ptr2 = kmalloc(size, GFP_KERNEL); |
73228c7e PA |
591 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2); |
592 | ||
1b1df4c4 AK |
593 | /* |
594 | * For tag-based KASAN ptr1 and ptr2 tags might happen to be the same. | |
595 | * Allow up to 16 attempts at generating different tags. | |
596 | */ | |
597 | if (!IS_ENABLED(CONFIG_KASAN_GENERIC) && ptr1 == ptr2 && counter++ < 16) { | |
598 | kfree(ptr2); | |
599 | goto again; | |
600 | } | |
601 | ||
8fbad19b | 602 | KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr1)[40]); |
73228c7e | 603 | KUNIT_EXPECT_PTR_NE(test, ptr1, ptr2); |
3f15801c | 604 | |
3f15801c AR |
605 | kfree(ptr2); |
606 | } | |
607 | ||
73228c7e | 608 | static void kfree_via_page(struct kunit *test) |
b92a953c MR |
609 | { |
610 | char *ptr; | |
611 | size_t size = 8; | |
612 | struct page *page; | |
613 | unsigned long offset; | |
614 | ||
b92a953c | 615 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 616 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
b92a953c MR |
617 | |
618 | page = virt_to_page(ptr); | |
619 | offset = offset_in_page(ptr); | |
620 | kfree(page_address(page) + offset); | |
621 | } | |
622 | ||
73228c7e | 623 | static void kfree_via_phys(struct kunit *test) |
b92a953c MR |
624 | { |
625 | char *ptr; | |
626 | size_t size = 8; | |
627 | phys_addr_t phys; | |
628 | ||
b92a953c | 629 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 630 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
b92a953c MR |
631 | |
632 | phys = virt_to_phys(ptr); | |
633 | kfree(phys_to_virt(phys)); | |
634 | } | |
635 | ||
73228c7e | 636 | static void kmem_cache_oob(struct kunit *test) |
3f15801c AR |
637 | { |
638 | char *p; | |
639 | size_t size = 200; | |
11516135 AK |
640 | struct kmem_cache *cache; |
641 | ||
642 | cache = kmem_cache_create("test_cache", size, 0, 0, NULL); | |
73228c7e | 643 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); |
11516135 | 644 | |
3f15801c AR |
645 | p = kmem_cache_alloc(cache, GFP_KERNEL); |
646 | if (!p) { | |
73228c7e | 647 | kunit_err(test, "Allocation failed: %s\n", __func__); |
3f15801c AR |
648 | kmem_cache_destroy(cache); |
649 | return; | |
650 | } | |
651 | ||
73228c7e | 652 | KUNIT_EXPECT_KASAN_FAIL(test, *p = p[size + OOB_TAG_OFF]); |
11516135 | 653 | |
3f15801c AR |
654 | kmem_cache_free(cache, p); |
655 | kmem_cache_destroy(cache); | |
656 | } | |
657 | ||
11516135 | 658 | static void kmem_cache_accounted(struct kunit *test) |
0386bf38 GT |
659 | { |
660 | int i; | |
661 | char *p; | |
662 | size_t size = 200; | |
663 | struct kmem_cache *cache; | |
664 | ||
665 | cache = kmem_cache_create("test_cache", size, 0, SLAB_ACCOUNT, NULL); | |
73228c7e | 666 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); |
0386bf38 | 667 | |
0386bf38 GT |
668 | /* |
669 | * Several allocations with a delay to allow for lazy per memcg kmem | |
670 | * cache creation. | |
671 | */ | |
672 | for (i = 0; i < 5; i++) { | |
673 | p = kmem_cache_alloc(cache, GFP_KERNEL); | |
dc2bf000 | 674 | if (!p) |
0386bf38 | 675 | goto free_cache; |
dc2bf000 | 676 | |
0386bf38 GT |
677 | kmem_cache_free(cache, p); |
678 | msleep(100); | |
679 | } | |
680 | ||
681 | free_cache: | |
682 | kmem_cache_destroy(cache); | |
683 | } | |
684 | ||
11516135 AK |
685 | static void kmem_cache_bulk(struct kunit *test) |
686 | { | |
687 | struct kmem_cache *cache; | |
688 | size_t size = 200; | |
689 | char *p[10]; | |
690 | bool ret; | |
691 | int i; | |
692 | ||
693 | cache = kmem_cache_create("test_cache", size, 0, 0, NULL); | |
694 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); | |
695 | ||
696 | ret = kmem_cache_alloc_bulk(cache, GFP_KERNEL, ARRAY_SIZE(p), (void **)&p); | |
697 | if (!ret) { | |
698 | kunit_err(test, "Allocation failed: %s\n", __func__); | |
699 | kmem_cache_destroy(cache); | |
700 | return; | |
701 | } | |
702 | ||
703 | for (i = 0; i < ARRAY_SIZE(p); i++) | |
704 | p[i][0] = p[i][size - 1] = 42; | |
705 | ||
706 | kmem_cache_free_bulk(cache, ARRAY_SIZE(p), (void **)&p); | |
707 | kmem_cache_destroy(cache); | |
708 | } | |
709 | ||
3f15801c AR |
710 | static char global_array[10]; |
711 | ||
e5f47287 | 712 | static void kasan_global_oob_right(struct kunit *test) |
3f15801c | 713 | { |
f649dc0e PC |
714 | /* |
715 | * Deliberate out-of-bounds access. To prevent CONFIG_UBSAN_LOCAL_BOUNDS | |
53b0fe36 | 716 | * from failing here and panicking the kernel, access the array via a |
f649dc0e PC |
717 | * volatile pointer, which will prevent the compiler from being able to |
718 | * determine the array bounds. | |
719 | * | |
720 | * This access uses a volatile pointer to char (char *volatile) rather | |
721 | * than the more conventional pointer to volatile char (volatile char *) | |
722 | * because we want to prevent the compiler from making inferences about | |
723 | * the pointer itself (i.e. its array bounds), not the data that it | |
724 | * refers to. | |
725 | */ | |
726 | char *volatile array = global_array; | |
727 | char *p = &array[ARRAY_SIZE(global_array) + 3]; | |
3f15801c | 728 | |
58b999d7 | 729 | /* Only generic mode instruments globals. */ |
da17e377 | 730 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC); |
58b999d7 | 731 | |
73228c7e | 732 | KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p); |
3f15801c AR |
733 | } |
734 | ||
e5f47287 ME |
735 | static void kasan_global_oob_left(struct kunit *test) |
736 | { | |
737 | char *volatile array = global_array; | |
738 | char *p = array - 3; | |
739 | ||
740 | /* | |
741 | * GCC is known to fail this test, skip it. | |
742 | * See https://bugzilla.kernel.org/show_bug.cgi?id=215051. | |
743 | */ | |
744 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_CC_IS_CLANG); | |
745 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC); | |
746 | KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p); | |
747 | } | |
748 | ||
611806b4 | 749 | /* Check that ksize() makes the whole object accessible. */ |
73228c7e | 750 | static void ksize_unpoisons_memory(struct kunit *test) |
96fe805f AP |
751 | { |
752 | char *ptr; | |
48c23239 | 753 | size_t size = 123, real_size; |
96fe805f | 754 | |
96fe805f | 755 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 756 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
96fe805f | 757 | real_size = ksize(ptr); |
0fd37925 AK |
758 | |
759 | /* This access shouldn't trigger a KASAN report. */ | |
96fe805f | 760 | ptr[size] = 'x'; |
0fd37925 AK |
761 | |
762 | /* This one must. */ | |
8fbad19b | 763 | KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[real_size]); |
0fd37925 | 764 | |
96fe805f AP |
765 | kfree(ptr); |
766 | } | |
767 | ||
611806b4 AK |
768 | /* |
769 | * Check that a use-after-free is detected by ksize() and via normal accesses | |
770 | * after it. | |
771 | */ | |
772 | static void ksize_uaf(struct kunit *test) | |
773 | { | |
774 | char *ptr; | |
775 | int size = 128 - KASAN_GRANULE_SIZE; | |
776 | ||
777 | ptr = kmalloc(size, GFP_KERNEL); | |
778 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
779 | kfree(ptr); | |
780 | ||
781 | KUNIT_EXPECT_KASAN_FAIL(test, ksize(ptr)); | |
b38fcca3 AK |
782 | KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[0]); |
783 | KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[size]); | |
611806b4 AK |
784 | } |
785 | ||
73228c7e | 786 | static void kasan_stack_oob(struct kunit *test) |
eae08dca | 787 | { |
73228c7e | 788 | char stack_array[10]; |
2dfd1bd9 | 789 | /* See comment in kasan_global_oob_right. */ |
f649dc0e PC |
790 | char *volatile array = stack_array; |
791 | char *p = &array[ARRAY_SIZE(stack_array) + OOB_TAG_OFF]; | |
eae08dca | 792 | |
da17e377 | 793 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_STACK); |
eae08dca | 794 | |
73228c7e | 795 | KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p); |
eae08dca AR |
796 | } |
797 | ||
73228c7e | 798 | static void kasan_alloca_oob_left(struct kunit *test) |
00a14294 PL |
799 | { |
800 | volatile int i = 10; | |
801 | char alloca_array[i]; | |
2dfd1bd9 | 802 | /* See comment in kasan_global_oob_right. */ |
f649dc0e PC |
803 | char *volatile array = alloca_array; |
804 | char *p = array - 1; | |
00a14294 | 805 | |
58b999d7 | 806 | /* Only generic mode instruments dynamic allocas. */ |
da17e377 AK |
807 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC); |
808 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_STACK); | |
73228c7e PA |
809 | |
810 | KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p); | |
00a14294 PL |
811 | } |
812 | ||
73228c7e | 813 | static void kasan_alloca_oob_right(struct kunit *test) |
00a14294 PL |
814 | { |
815 | volatile int i = 10; | |
816 | char alloca_array[i]; | |
2dfd1bd9 | 817 | /* See comment in kasan_global_oob_right. */ |
f649dc0e PC |
818 | char *volatile array = alloca_array; |
819 | char *p = array + i; | |
00a14294 | 820 | |
58b999d7 | 821 | /* Only generic mode instruments dynamic allocas. */ |
da17e377 AK |
822 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC); |
823 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_STACK); | |
73228c7e PA |
824 | |
825 | KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p); | |
00a14294 PL |
826 | } |
827 | ||
73228c7e | 828 | static void kmem_cache_double_free(struct kunit *test) |
b1d57289 DV |
829 | { |
830 | char *p; | |
831 | size_t size = 200; | |
832 | struct kmem_cache *cache; | |
833 | ||
834 | cache = kmem_cache_create("test_cache", size, 0, 0, NULL); | |
73228c7e PA |
835 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); |
836 | ||
b1d57289 DV |
837 | p = kmem_cache_alloc(cache, GFP_KERNEL); |
838 | if (!p) { | |
73228c7e | 839 | kunit_err(test, "Allocation failed: %s\n", __func__); |
b1d57289 DV |
840 | kmem_cache_destroy(cache); |
841 | return; | |
842 | } | |
843 | ||
844 | kmem_cache_free(cache, p); | |
73228c7e | 845 | KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_free(cache, p)); |
b1d57289 DV |
846 | kmem_cache_destroy(cache); |
847 | } | |
848 | ||
73228c7e | 849 | static void kmem_cache_invalid_free(struct kunit *test) |
b1d57289 DV |
850 | { |
851 | char *p; | |
852 | size_t size = 200; | |
853 | struct kmem_cache *cache; | |
854 | ||
855 | cache = kmem_cache_create("test_cache", size, 0, SLAB_TYPESAFE_BY_RCU, | |
856 | NULL); | |
73228c7e PA |
857 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); |
858 | ||
b1d57289 DV |
859 | p = kmem_cache_alloc(cache, GFP_KERNEL); |
860 | if (!p) { | |
73228c7e | 861 | kunit_err(test, "Allocation failed: %s\n", __func__); |
b1d57289 DV |
862 | kmem_cache_destroy(cache); |
863 | return; | |
864 | } | |
865 | ||
0fd37925 | 866 | /* Trigger invalid free, the object doesn't get freed. */ |
73228c7e | 867 | KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_free(cache, p + 1)); |
91c93ed0 AK |
868 | |
869 | /* | |
870 | * Properly free the object to prevent the "Objects remaining in | |
871 | * test_cache on __kmem_cache_shutdown" BUG failure. | |
872 | */ | |
873 | kmem_cache_free(cache, p); | |
874 | ||
b1d57289 DV |
875 | kmem_cache_destroy(cache); |
876 | } | |
877 | ||
70effdc3 AK |
878 | static void empty_cache_ctor(void *object) { } |
879 | ||
f98f966c ME |
880 | static void kmem_cache_double_destroy(struct kunit *test) |
881 | { | |
882 | struct kmem_cache *cache; | |
883 | ||
70effdc3 AK |
884 | /* Provide a constructor to prevent cache merging. */ |
885 | cache = kmem_cache_create("test_cache", 200, 0, 0, empty_cache_ctor); | |
f98f966c ME |
886 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); |
887 | kmem_cache_destroy(cache); | |
888 | KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_destroy(cache)); | |
889 | } | |
890 | ||
73228c7e | 891 | static void kasan_memchr(struct kunit *test) |
0c96350a AR |
892 | { |
893 | char *ptr; | |
894 | size_t size = 24; | |
895 | ||
0fd37925 AK |
896 | /* |
897 | * str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT. | |
898 | * See https://bugzilla.kernel.org/show_bug.cgi?id=206337 for details. | |
899 | */ | |
da17e377 | 900 | KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_AMD_MEM_ENCRYPT); |
73228c7e | 901 | |
58b999d7 AK |
902 | if (OOB_TAG_OFF) |
903 | size = round_up(size, OOB_TAG_OFF); | |
904 | ||
73228c7e PA |
905 | ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO); |
906 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
907 | ||
09c6304e | 908 | OPTIMIZER_HIDE_VAR(ptr); |
cab71f74 | 909 | OPTIMIZER_HIDE_VAR(size); |
73228c7e PA |
910 | KUNIT_EXPECT_KASAN_FAIL(test, |
911 | kasan_ptr_result = memchr(ptr, '1', size + 1)); | |
0c96350a | 912 | |
0c96350a AR |
913 | kfree(ptr); |
914 | } | |
915 | ||
73228c7e | 916 | static void kasan_memcmp(struct kunit *test) |
0c96350a AR |
917 | { |
918 | char *ptr; | |
919 | size_t size = 24; | |
920 | int arr[9]; | |
921 | ||
0fd37925 AK |
922 | /* |
923 | * str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT. | |
924 | * See https://bugzilla.kernel.org/show_bug.cgi?id=206337 for details. | |
925 | */ | |
da17e377 | 926 | KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_AMD_MEM_ENCRYPT); |
0c96350a | 927 | |
58b999d7 AK |
928 | if (OOB_TAG_OFF) |
929 | size = round_up(size, OOB_TAG_OFF); | |
930 | ||
73228c7e PA |
931 | ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO); |
932 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
0c96350a | 933 | memset(arr, 0, sizeof(arr)); |
73228c7e | 934 | |
09c6304e | 935 | OPTIMIZER_HIDE_VAR(ptr); |
cab71f74 | 936 | OPTIMIZER_HIDE_VAR(size); |
73228c7e PA |
937 | KUNIT_EXPECT_KASAN_FAIL(test, |
938 | kasan_int_result = memcmp(ptr, arr, size+1)); | |
0c96350a AR |
939 | kfree(ptr); |
940 | } | |
941 | ||
73228c7e | 942 | static void kasan_strings(struct kunit *test) |
0c96350a AR |
943 | { |
944 | char *ptr; | |
945 | size_t size = 24; | |
946 | ||
0fd37925 AK |
947 | /* |
948 | * str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT. | |
949 | * See https://bugzilla.kernel.org/show_bug.cgi?id=206337 for details. | |
950 | */ | |
da17e377 | 951 | KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_AMD_MEM_ENCRYPT); |
73228c7e PA |
952 | |
953 | ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO); | |
954 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
0c96350a AR |
955 | |
956 | kfree(ptr); | |
957 | ||
958 | /* | |
959 | * Try to cause only 1 invalid access (less spam in dmesg). | |
960 | * For that we need ptr to point to zeroed byte. | |
961 | * Skip metadata that could be stored in freed object so ptr | |
962 | * will likely point to zeroed byte. | |
963 | */ | |
964 | ptr += 16; | |
73228c7e | 965 | KUNIT_EXPECT_KASAN_FAIL(test, kasan_ptr_result = strchr(ptr, '1')); |
0c96350a | 966 | |
73228c7e | 967 | KUNIT_EXPECT_KASAN_FAIL(test, kasan_ptr_result = strrchr(ptr, '1')); |
0c96350a | 968 | |
73228c7e | 969 | KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strcmp(ptr, "2")); |
0c96350a | 970 | |
73228c7e | 971 | KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strncmp(ptr, "2", 1)); |
0c96350a | 972 | |
73228c7e | 973 | KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strlen(ptr)); |
0c96350a | 974 | |
73228c7e | 975 | KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strnlen(ptr, 1)); |
0c96350a AR |
976 | } |
977 | ||
58b999d7 AK |
978 | static void kasan_bitops_modify(struct kunit *test, int nr, void *addr) |
979 | { | |
980 | KUNIT_EXPECT_KASAN_FAIL(test, set_bit(nr, addr)); | |
981 | KUNIT_EXPECT_KASAN_FAIL(test, __set_bit(nr, addr)); | |
982 | KUNIT_EXPECT_KASAN_FAIL(test, clear_bit(nr, addr)); | |
983 | KUNIT_EXPECT_KASAN_FAIL(test, __clear_bit(nr, addr)); | |
984 | KUNIT_EXPECT_KASAN_FAIL(test, clear_bit_unlock(nr, addr)); | |
985 | KUNIT_EXPECT_KASAN_FAIL(test, __clear_bit_unlock(nr, addr)); | |
986 | KUNIT_EXPECT_KASAN_FAIL(test, change_bit(nr, addr)); | |
987 | KUNIT_EXPECT_KASAN_FAIL(test, __change_bit(nr, addr)); | |
988 | } | |
989 | ||
990 | static void kasan_bitops_test_and_modify(struct kunit *test, int nr, void *addr) | |
991 | { | |
992 | KUNIT_EXPECT_KASAN_FAIL(test, test_and_set_bit(nr, addr)); | |
993 | KUNIT_EXPECT_KASAN_FAIL(test, __test_and_set_bit(nr, addr)); | |
994 | KUNIT_EXPECT_KASAN_FAIL(test, test_and_set_bit_lock(nr, addr)); | |
995 | KUNIT_EXPECT_KASAN_FAIL(test, test_and_clear_bit(nr, addr)); | |
996 | KUNIT_EXPECT_KASAN_FAIL(test, __test_and_clear_bit(nr, addr)); | |
997 | KUNIT_EXPECT_KASAN_FAIL(test, test_and_change_bit(nr, addr)); | |
998 | KUNIT_EXPECT_KASAN_FAIL(test, __test_and_change_bit(nr, addr)); | |
999 | KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = test_bit(nr, addr)); | |
1000 | ||
1001 | #if defined(clear_bit_unlock_is_negative_byte) | |
1002 | KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = | |
1003 | clear_bit_unlock_is_negative_byte(nr, addr)); | |
1004 | #endif | |
1005 | } | |
1006 | ||
1007 | static void kasan_bitops_generic(struct kunit *test) | |
19a33ca6 | 1008 | { |
58b999d7 AK |
1009 | long *bits; |
1010 | ||
1011 | /* This test is specifically crafted for the generic mode. */ | |
da17e377 | 1012 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC); |
58b999d7 | 1013 | |
19a33ca6 | 1014 | /* |
0fd37925 | 1015 | * Allocate 1 more byte, which causes kzalloc to round up to 16 bytes; |
19a33ca6 ME |
1016 | * this way we do not actually corrupt other memory. |
1017 | */ | |
58b999d7 | 1018 | bits = kzalloc(sizeof(*bits) + 1, GFP_KERNEL); |
73228c7e | 1019 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, bits); |
19a33ca6 ME |
1020 | |
1021 | /* | |
1022 | * Below calls try to access bit within allocated memory; however, the | |
1023 | * below accesses are still out-of-bounds, since bitops are defined to | |
1024 | * operate on the whole long the bit is in. | |
1025 | */ | |
58b999d7 | 1026 | kasan_bitops_modify(test, BITS_PER_LONG, bits); |
19a33ca6 ME |
1027 | |
1028 | /* | |
1029 | * Below calls try to access bit beyond allocated memory. | |
1030 | */ | |
58b999d7 | 1031 | kasan_bitops_test_and_modify(test, BITS_PER_LONG + BITS_PER_BYTE, bits); |
19a33ca6 | 1032 | |
58b999d7 AK |
1033 | kfree(bits); |
1034 | } | |
19a33ca6 | 1035 | |
58b999d7 AK |
1036 | static void kasan_bitops_tags(struct kunit *test) |
1037 | { | |
1038 | long *bits; | |
19a33ca6 | 1039 | |
da17e377 AK |
1040 | /* This test is specifically crafted for tag-based modes. */ |
1041 | KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC); | |
19a33ca6 | 1042 | |
e66e1799 AK |
1043 | /* kmalloc-64 cache will be used and the last 16 bytes will be the redzone. */ |
1044 | bits = kzalloc(48, GFP_KERNEL); | |
58b999d7 | 1045 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, bits); |
19a33ca6 | 1046 | |
e66e1799 AK |
1047 | /* Do the accesses past the 48 allocated bytes, but within the redone. */ |
1048 | kasan_bitops_modify(test, BITS_PER_LONG, (void *)bits + 48); | |
1049 | kasan_bitops_test_and_modify(test, BITS_PER_LONG + BITS_PER_BYTE, (void *)bits + 48); | |
19a33ca6 | 1050 | |
19a33ca6 ME |
1051 | kfree(bits); |
1052 | } | |
1053 | ||
73228c7e | 1054 | static void kmalloc_double_kzfree(struct kunit *test) |
bb104ed7 ME |
1055 | { |
1056 | char *ptr; | |
1057 | size_t size = 16; | |
1058 | ||
bb104ed7 | 1059 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 1060 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
bb104ed7 | 1061 | |
453431a5 | 1062 | kfree_sensitive(ptr); |
73228c7e | 1063 | KUNIT_EXPECT_KASAN_FAIL(test, kfree_sensitive(ptr)); |
bb104ed7 ME |
1064 | } |
1065 | ||
1a2473f0 AK |
1066 | static void vmalloc_helpers_tags(struct kunit *test) |
1067 | { | |
1068 | void *ptr; | |
1069 | ||
1070 | /* This test is intended for tag-based modes. */ | |
1071 | KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC); | |
1072 | ||
1073 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_VMALLOC); | |
1074 | ||
1075 | ptr = vmalloc(PAGE_SIZE); | |
1076 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
1077 | ||
1078 | /* Check that the returned pointer is tagged. */ | |
1079 | KUNIT_EXPECT_GE(test, (u8)get_tag(ptr), (u8)KASAN_TAG_MIN); | |
1080 | KUNIT_EXPECT_LT(test, (u8)get_tag(ptr), (u8)KASAN_TAG_KERNEL); | |
1081 | ||
1082 | /* Make sure exported vmalloc helpers handle tagged pointers. */ | |
1083 | KUNIT_ASSERT_TRUE(test, is_vmalloc_addr(ptr)); | |
1084 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, vmalloc_to_page(ptr)); | |
1085 | ||
1086 | #if !IS_MODULE(CONFIG_KASAN_KUNIT_TEST) | |
1087 | { | |
1088 | int rv; | |
1089 | ||
1090 | /* Make sure vmalloc'ed memory permissions can be changed. */ | |
1091 | rv = set_memory_ro((unsigned long)ptr, 1); | |
1092 | KUNIT_ASSERT_GE(test, rv, 0); | |
1093 | rv = set_memory_rw((unsigned long)ptr, 1); | |
1094 | KUNIT_ASSERT_GE(test, rv, 0); | |
1095 | } | |
1096 | #endif | |
1097 | ||
1098 | vfree(ptr); | |
1099 | } | |
1100 | ||
73228c7e | 1101 | static void vmalloc_oob(struct kunit *test) |
06513916 | 1102 | { |
1a2473f0 AK |
1103 | char *v_ptr, *p_ptr; |
1104 | struct page *page; | |
1105 | size_t size = PAGE_SIZE / 2 - KASAN_GRANULE_SIZE - 5; | |
06513916 | 1106 | |
da17e377 | 1107 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_VMALLOC); |
06513916 | 1108 | |
1a2473f0 AK |
1109 | v_ptr = vmalloc(size); |
1110 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, v_ptr); | |
1111 | ||
1112 | OPTIMIZER_HIDE_VAR(v_ptr); | |
1113 | ||
06513916 | 1114 | /* |
1a2473f0 | 1115 | * We have to be careful not to hit the guard page in vmalloc tests. |
06513916 DA |
1116 | * The MMU will catch that and crash us. |
1117 | */ | |
06513916 | 1118 | |
1a2473f0 AK |
1119 | /* Make sure in-bounds accesses are valid. */ |
1120 | v_ptr[0] = 0; | |
1121 | v_ptr[size - 1] = 0; | |
1122 | ||
1123 | /* | |
1124 | * An unaligned access past the requested vmalloc size. | |
1125 | * Only generic KASAN can precisely detect these. | |
1126 | */ | |
1127 | if (IS_ENABLED(CONFIG_KASAN_GENERIC)) | |
1128 | KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)v_ptr)[size]); | |
1129 | ||
1130 | /* An aligned access into the first out-of-bounds granule. */ | |
1131 | KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)v_ptr)[size + 5]); | |
1132 | ||
1133 | /* Check that in-bounds accesses to the physical page are valid. */ | |
1134 | page = vmalloc_to_page(v_ptr); | |
1135 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, page); | |
1136 | p_ptr = page_address(page); | |
1137 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, p_ptr); | |
1138 | p_ptr[0] = 0; | |
1139 | ||
1140 | vfree(v_ptr); | |
1141 | ||
1142 | /* | |
1143 | * We can't check for use-after-unmap bugs in this nor in the following | |
1144 | * vmalloc tests, as the page might be fully unmapped and accessing it | |
1145 | * will crash the kernel. | |
1146 | */ | |
1147 | } | |
1148 | ||
1149 | static void vmap_tags(struct kunit *test) | |
1150 | { | |
1151 | char *p_ptr, *v_ptr; | |
1152 | struct page *p_page, *v_page; | |
1153 | ||
1154 | /* | |
1155 | * This test is specifically crafted for the software tag-based mode, | |
1156 | * the only tag-based mode that poisons vmap mappings. | |
1157 | */ | |
1158 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_SW_TAGS); | |
1159 | ||
1160 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_VMALLOC); | |
1161 | ||
1162 | p_page = alloc_pages(GFP_KERNEL, 1); | |
1163 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, p_page); | |
1164 | p_ptr = page_address(p_page); | |
1165 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, p_ptr); | |
1166 | ||
1167 | v_ptr = vmap(&p_page, 1, VM_MAP, PAGE_KERNEL); | |
1168 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, v_ptr); | |
1169 | ||
1170 | /* | |
1171 | * We can't check for out-of-bounds bugs in this nor in the following | |
1172 | * vmalloc tests, as allocations have page granularity and accessing | |
1173 | * the guard page will crash the kernel. | |
1174 | */ | |
1175 | ||
1176 | KUNIT_EXPECT_GE(test, (u8)get_tag(v_ptr), (u8)KASAN_TAG_MIN); | |
1177 | KUNIT_EXPECT_LT(test, (u8)get_tag(v_ptr), (u8)KASAN_TAG_KERNEL); | |
1178 | ||
1179 | /* Make sure that in-bounds accesses through both pointers work. */ | |
1180 | *p_ptr = 0; | |
1181 | *v_ptr = 0; | |
1182 | ||
1183 | /* Make sure vmalloc_to_page() correctly recovers the page pointer. */ | |
1184 | v_page = vmalloc_to_page(v_ptr); | |
1185 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, v_page); | |
1186 | KUNIT_EXPECT_PTR_EQ(test, p_page, v_page); | |
1187 | ||
1188 | vunmap(v_ptr); | |
1189 | free_pages((unsigned long)p_ptr, 1); | |
1190 | } | |
1191 | ||
1192 | static void vm_map_ram_tags(struct kunit *test) | |
1193 | { | |
1194 | char *p_ptr, *v_ptr; | |
1195 | struct page *page; | |
1196 | ||
1197 | /* | |
1198 | * This test is specifically crafted for the software tag-based mode, | |
1199 | * the only tag-based mode that poisons vm_map_ram mappings. | |
1200 | */ | |
1201 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_SW_TAGS); | |
1202 | ||
1203 | page = alloc_pages(GFP_KERNEL, 1); | |
1204 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, page); | |
1205 | p_ptr = page_address(page); | |
1206 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, p_ptr); | |
1207 | ||
1208 | v_ptr = vm_map_ram(&page, 1, -1); | |
1209 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, v_ptr); | |
1210 | ||
1211 | KUNIT_EXPECT_GE(test, (u8)get_tag(v_ptr), (u8)KASAN_TAG_MIN); | |
1212 | KUNIT_EXPECT_LT(test, (u8)get_tag(v_ptr), (u8)KASAN_TAG_KERNEL); | |
1213 | ||
1214 | /* Make sure that in-bounds accesses through both pointers work. */ | |
1215 | *p_ptr = 0; | |
1216 | *v_ptr = 0; | |
1217 | ||
1218 | vm_unmap_ram(v_ptr, 1); | |
1219 | free_pages((unsigned long)p_ptr, 1); | |
1220 | } | |
1221 | ||
1222 | static void vmalloc_percpu(struct kunit *test) | |
1223 | { | |
1224 | char __percpu *ptr; | |
1225 | int cpu; | |
1226 | ||
1227 | /* | |
1228 | * This test is specifically crafted for the software tag-based mode, | |
1229 | * the only tag-based mode that poisons percpu mappings. | |
1230 | */ | |
1231 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_SW_TAGS); | |
1232 | ||
1233 | ptr = __alloc_percpu(PAGE_SIZE, PAGE_SIZE); | |
1234 | ||
1235 | for_each_possible_cpu(cpu) { | |
1236 | char *c_ptr = per_cpu_ptr(ptr, cpu); | |
1237 | ||
1238 | KUNIT_EXPECT_GE(test, (u8)get_tag(c_ptr), (u8)KASAN_TAG_MIN); | |
1239 | KUNIT_EXPECT_LT(test, (u8)get_tag(c_ptr), (u8)KASAN_TAG_KERNEL); | |
1240 | ||
1241 | /* Make sure that in-bounds accesses don't crash the kernel. */ | |
1242 | *c_ptr = 0; | |
1243 | } | |
1244 | ||
1245 | free_percpu(ptr); | |
06513916 | 1246 | } |
387d6e46 | 1247 | |
573a4809 AK |
1248 | /* |
1249 | * Check that the assigned pointer tag falls within the [KASAN_TAG_MIN, | |
1250 | * KASAN_TAG_KERNEL) range (note: excluding the match-all tag) for tag-based | |
1251 | * modes. | |
1252 | */ | |
1253 | static void match_all_not_assigned(struct kunit *test) | |
1254 | { | |
1255 | char *ptr; | |
1256 | struct page *pages; | |
1257 | int i, size, order; | |
1258 | ||
1259 | KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC); | |
1260 | ||
1261 | for (i = 0; i < 256; i++) { | |
1262 | size = (get_random_int() % 1024) + 1; | |
1263 | ptr = kmalloc(size, GFP_KERNEL); | |
1264 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
1265 | KUNIT_EXPECT_GE(test, (u8)get_tag(ptr), (u8)KASAN_TAG_MIN); | |
1266 | KUNIT_EXPECT_LT(test, (u8)get_tag(ptr), (u8)KASAN_TAG_KERNEL); | |
1267 | kfree(ptr); | |
1268 | } | |
1269 | ||
1270 | for (i = 0; i < 256; i++) { | |
1271 | order = (get_random_int() % 4) + 1; | |
1272 | pages = alloc_pages(GFP_KERNEL, order); | |
1273 | ptr = page_address(pages); | |
1274 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
1275 | KUNIT_EXPECT_GE(test, (u8)get_tag(ptr), (u8)KASAN_TAG_MIN); | |
1276 | KUNIT_EXPECT_LT(test, (u8)get_tag(ptr), (u8)KASAN_TAG_KERNEL); | |
1277 | free_pages((unsigned long)ptr, order); | |
1278 | } | |
1a2473f0 AK |
1279 | |
1280 | if (!IS_ENABLED(CONFIG_KASAN_VMALLOC)) | |
1281 | return; | |
1282 | ||
1283 | for (i = 0; i < 256; i++) { | |
1284 | size = (get_random_int() % 1024) + 1; | |
1285 | ptr = vmalloc(size); | |
1286 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
1287 | KUNIT_EXPECT_GE(test, (u8)get_tag(ptr), (u8)KASAN_TAG_MIN); | |
1288 | KUNIT_EXPECT_LT(test, (u8)get_tag(ptr), (u8)KASAN_TAG_KERNEL); | |
1289 | vfree(ptr); | |
1290 | } | |
573a4809 AK |
1291 | } |
1292 | ||
1293 | /* Check that 0xff works as a match-all pointer tag for tag-based modes. */ | |
1294 | static void match_all_ptr_tag(struct kunit *test) | |
1295 | { | |
1296 | char *ptr; | |
1297 | u8 tag; | |
1298 | ||
1299 | KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC); | |
1300 | ||
1301 | ptr = kmalloc(128, GFP_KERNEL); | |
1302 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
1303 | ||
1304 | /* Backup the assigned tag. */ | |
1305 | tag = get_tag(ptr); | |
1306 | KUNIT_EXPECT_NE(test, tag, (u8)KASAN_TAG_KERNEL); | |
1307 | ||
1308 | /* Reset the tag to 0xff.*/ | |
1309 | ptr = set_tag(ptr, KASAN_TAG_KERNEL); | |
1310 | ||
1311 | /* This access shouldn't trigger a KASAN report. */ | |
1312 | *ptr = 0; | |
1313 | ||
1314 | /* Recover the pointer tag and free. */ | |
1315 | ptr = set_tag(ptr, tag); | |
1316 | kfree(ptr); | |
1317 | } | |
1318 | ||
1319 | /* Check that there are no match-all memory tags for tag-based modes. */ | |
1320 | static void match_all_mem_tag(struct kunit *test) | |
1321 | { | |
1322 | char *ptr; | |
1323 | int tag; | |
1324 | ||
1325 | KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC); | |
1326 | ||
1327 | ptr = kmalloc(128, GFP_KERNEL); | |
1328 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
1329 | KUNIT_EXPECT_NE(test, (u8)get_tag(ptr), (u8)KASAN_TAG_KERNEL); | |
1330 | ||
1331 | /* For each possible tag value not matching the pointer tag. */ | |
1332 | for (tag = KASAN_TAG_MIN; tag <= KASAN_TAG_KERNEL; tag++) { | |
1333 | if (tag == get_tag(ptr)) | |
1334 | continue; | |
1335 | ||
1336 | /* Mark the first memory granule with the chosen memory tag. */ | |
aa5c219c | 1337 | kasan_poison(ptr, KASAN_GRANULE_SIZE, (u8)tag, false); |
573a4809 AK |
1338 | |
1339 | /* This access must cause a KASAN report. */ | |
1340 | KUNIT_EXPECT_KASAN_FAIL(test, *ptr = 0); | |
1341 | } | |
1342 | ||
1343 | /* Recover the memory tag and free. */ | |
aa5c219c | 1344 | kasan_poison(ptr, KASAN_GRANULE_SIZE, get_tag(ptr), false); |
573a4809 AK |
1345 | kfree(ptr); |
1346 | } | |
1347 | ||
73228c7e PA |
1348 | static struct kunit_case kasan_kunit_test_cases[] = { |
1349 | KUNIT_CASE(kmalloc_oob_right), | |
1350 | KUNIT_CASE(kmalloc_oob_left), | |
1351 | KUNIT_CASE(kmalloc_node_oob_right), | |
1352 | KUNIT_CASE(kmalloc_pagealloc_oob_right), | |
1353 | KUNIT_CASE(kmalloc_pagealloc_uaf), | |
1354 | KUNIT_CASE(kmalloc_pagealloc_invalid_free), | |
858bdeb0 AK |
1355 | KUNIT_CASE(pagealloc_oob_right), |
1356 | KUNIT_CASE(pagealloc_uaf), | |
73228c7e | 1357 | KUNIT_CASE(kmalloc_large_oob_right), |
b87c28b9 AK |
1358 | KUNIT_CASE(krealloc_more_oob), |
1359 | KUNIT_CASE(krealloc_less_oob), | |
1360 | KUNIT_CASE(krealloc_pagealloc_more_oob), | |
1361 | KUNIT_CASE(krealloc_pagealloc_less_oob), | |
26a5ca7a | 1362 | KUNIT_CASE(krealloc_uaf), |
73228c7e | 1363 | KUNIT_CASE(kmalloc_oob_16), |
58b999d7 | 1364 | KUNIT_CASE(kmalloc_uaf_16), |
73228c7e PA |
1365 | KUNIT_CASE(kmalloc_oob_in_memset), |
1366 | KUNIT_CASE(kmalloc_oob_memset_2), | |
1367 | KUNIT_CASE(kmalloc_oob_memset_4), | |
1368 | KUNIT_CASE(kmalloc_oob_memset_8), | |
1369 | KUNIT_CASE(kmalloc_oob_memset_16), | |
758cabae | 1370 | KUNIT_CASE(kmalloc_memmove_negative_size), |
73228c7e PA |
1371 | KUNIT_CASE(kmalloc_memmove_invalid_size), |
1372 | KUNIT_CASE(kmalloc_uaf), | |
1373 | KUNIT_CASE(kmalloc_uaf_memset), | |
1374 | KUNIT_CASE(kmalloc_uaf2), | |
1375 | KUNIT_CASE(kfree_via_page), | |
1376 | KUNIT_CASE(kfree_via_phys), | |
1377 | KUNIT_CASE(kmem_cache_oob), | |
11516135 AK |
1378 | KUNIT_CASE(kmem_cache_accounted), |
1379 | KUNIT_CASE(kmem_cache_bulk), | |
e5f47287 ME |
1380 | KUNIT_CASE(kasan_global_oob_right), |
1381 | KUNIT_CASE(kasan_global_oob_left), | |
73228c7e PA |
1382 | KUNIT_CASE(kasan_stack_oob), |
1383 | KUNIT_CASE(kasan_alloca_oob_left), | |
1384 | KUNIT_CASE(kasan_alloca_oob_right), | |
1385 | KUNIT_CASE(ksize_unpoisons_memory), | |
611806b4 | 1386 | KUNIT_CASE(ksize_uaf), |
73228c7e PA |
1387 | KUNIT_CASE(kmem_cache_double_free), |
1388 | KUNIT_CASE(kmem_cache_invalid_free), | |
f98f966c | 1389 | KUNIT_CASE(kmem_cache_double_destroy), |
73228c7e PA |
1390 | KUNIT_CASE(kasan_memchr), |
1391 | KUNIT_CASE(kasan_memcmp), | |
1392 | KUNIT_CASE(kasan_strings), | |
58b999d7 AK |
1393 | KUNIT_CASE(kasan_bitops_generic), |
1394 | KUNIT_CASE(kasan_bitops_tags), | |
73228c7e | 1395 | KUNIT_CASE(kmalloc_double_kzfree), |
1a2473f0 | 1396 | KUNIT_CASE(vmalloc_helpers_tags), |
73228c7e | 1397 | KUNIT_CASE(vmalloc_oob), |
1a2473f0 AK |
1398 | KUNIT_CASE(vmap_tags), |
1399 | KUNIT_CASE(vm_map_ram_tags), | |
1400 | KUNIT_CASE(vmalloc_percpu), | |
573a4809 AK |
1401 | KUNIT_CASE(match_all_not_assigned), |
1402 | KUNIT_CASE(match_all_ptr_tag), | |
1403 | KUNIT_CASE(match_all_mem_tag), | |
73228c7e PA |
1404 | {} |
1405 | }; | |
1406 | ||
1407 | static struct kunit_suite kasan_kunit_test_suite = { | |
1408 | .name = "kasan", | |
1409 | .init = kasan_test_init, | |
1410 | .test_cases = kasan_kunit_test_cases, | |
1411 | .exit = kasan_test_exit, | |
1412 | }; | |
1413 | ||
1414 | kunit_test_suite(kasan_kunit_test_suite); | |
3f15801c | 1415 | |
3f15801c | 1416 | MODULE_LICENSE("GPL"); |