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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(); |
99734b53 | 56 | fail_data.report_found = false; |
99734b53 AK |
57 | kunit_add_named_resource(test, NULL, NULL, &resource, |
58 | "kasan_data", &fail_data); | |
83c4e7a0 PA |
59 | return 0; |
60 | } | |
61 | ||
62 | static void kasan_test_exit(struct kunit *test) | |
63 | { | |
64 | kasan_restore_multi_shot(multishot); | |
99734b53 | 65 | KUNIT_EXPECT_FALSE(test, fail_data.report_found); |
83c4e7a0 PA |
66 | } |
67 | ||
68 | /** | |
0fd37925 AK |
69 | * KUNIT_EXPECT_KASAN_FAIL() - check that the executed expression produces a |
70 | * KASAN report; causes a test failure otherwise. This relies on a KUnit | |
71 | * resource named "kasan_data". Do not use this name for KUnit resources | |
72 | * outside of KASAN tests. | |
f05842cf | 73 | * |
e80a76aa AK |
74 | * For hardware tag-based KASAN in sync mode, when a tag fault happens, tag |
75 | * checking is auto-disabled. When this happens, this test handler reenables | |
76 | * tag checking. As tag checking can be only disabled or enabled per CPU, | |
77 | * this handler disables migration (preemption). | |
2e4bde6a AK |
78 | * |
79 | * Since the compiler doesn't see that the expression can change the fail_data | |
80 | * fields, it can reorder or optimize away the accesses to those fields. | |
81 | * Use READ/WRITE_ONCE() for the accesses and compiler barriers around the | |
82 | * expression to prevent that. | |
99734b53 AK |
83 | * |
84 | * In between KUNIT_EXPECT_KASAN_FAIL checks, fail_data.report_found is kept as | |
85 | * false. This allows detecting KASAN reports that happen outside of the checks | |
86 | * by asserting !fail_data.report_found at the start of KUNIT_EXPECT_KASAN_FAIL | |
87 | * and in kasan_test_exit. | |
83c4e7a0 | 88 | */ |
99734b53 AK |
89 | #define KUNIT_EXPECT_KASAN_FAIL(test, expression) do { \ |
90 | if (IS_ENABLED(CONFIG_KASAN_HW_TAGS) && \ | |
91 | !kasan_async_mode_enabled()) \ | |
92 | migrate_disable(); \ | |
93 | KUNIT_EXPECT_FALSE(test, READ_ONCE(fail_data.report_found)); \ | |
99734b53 AK |
94 | barrier(); \ |
95 | expression; \ | |
96 | barrier(); \ | |
3ff16d30 DG |
97 | if (!READ_ONCE(fail_data.report_found)) { \ |
98 | KUNIT_FAIL(test, KUNIT_SUBTEST_INDENT "KASAN failure " \ | |
99 | "expected in \"" #expression \ | |
100 | "\", but none occurred"); \ | |
101 | } \ | |
99734b53 AK |
102 | if (IS_ENABLED(CONFIG_KASAN_HW_TAGS)) { \ |
103 | if (READ_ONCE(fail_data.report_found)) \ | |
104 | kasan_enable_tagging_sync(); \ | |
105 | migrate_enable(); \ | |
106 | } \ | |
107 | WRITE_ONCE(fail_data.report_found, false); \ | |
83c4e7a0 PA |
108 | } while (0) |
109 | ||
da17e377 | 110 | #define KASAN_TEST_NEEDS_CONFIG_ON(test, config) do { \ |
40eb5cf4 ME |
111 | if (!IS_ENABLED(config)) \ |
112 | kunit_skip((test), "Test requires " #config "=y"); \ | |
da17e377 AK |
113 | } while (0) |
114 | ||
115 | #define KASAN_TEST_NEEDS_CONFIG_OFF(test, config) do { \ | |
40eb5cf4 ME |
116 | if (IS_ENABLED(config)) \ |
117 | kunit_skip((test), "Test requires " #config "=n"); \ | |
da17e377 AK |
118 | } while (0) |
119 | ||
73228c7e | 120 | static void kmalloc_oob_right(struct kunit *test) |
3f15801c AR |
121 | { |
122 | char *ptr; | |
ab512805 | 123 | size_t size = 128 - KASAN_GRANULE_SIZE - 5; |
3f15801c | 124 | |
3f15801c | 125 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 126 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
f33a0149 | 127 | |
d4c1a24f | 128 | OPTIMIZER_HIDE_VAR(ptr); |
ab512805 AK |
129 | /* |
130 | * An unaligned access past the requested kmalloc size. | |
131 | * Only generic KASAN can precisely detect these. | |
132 | */ | |
133 | if (IS_ENABLED(CONFIG_KASAN_GENERIC)) | |
134 | KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 'x'); | |
135 | ||
136 | /* | |
137 | * An aligned access into the first out-of-bounds granule that falls | |
138 | * within the aligned kmalloc object. | |
139 | */ | |
140 | KUNIT_EXPECT_KASAN_FAIL(test, ptr[size + 5] = 'y'); | |
141 | ||
142 | /* Out-of-bounds access past the aligned kmalloc object. */ | |
143 | KUNIT_EXPECT_KASAN_FAIL(test, ptr[0] = | |
144 | ptr[size + KASAN_GRANULE_SIZE + 5]); | |
145 | ||
3f15801c AR |
146 | kfree(ptr); |
147 | } | |
148 | ||
73228c7e | 149 | static void kmalloc_oob_left(struct kunit *test) |
3f15801c AR |
150 | { |
151 | char *ptr; | |
152 | size_t size = 15; | |
153 | ||
3f15801c | 154 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 155 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
3f15801c | 156 | |
d4c1a24f | 157 | OPTIMIZER_HIDE_VAR(ptr); |
73228c7e | 158 | KUNIT_EXPECT_KASAN_FAIL(test, *ptr = *(ptr - 1)); |
3f15801c AR |
159 | kfree(ptr); |
160 | } | |
161 | ||
73228c7e | 162 | static void kmalloc_node_oob_right(struct kunit *test) |
3f15801c AR |
163 | { |
164 | char *ptr; | |
165 | size_t size = 4096; | |
166 | ||
3f15801c | 167 | ptr = kmalloc_node(size, GFP_KERNEL, 0); |
73228c7e | 168 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
3f15801c | 169 | |
d4c1a24f | 170 | OPTIMIZER_HIDE_VAR(ptr); |
8fbad19b | 171 | KUNIT_EXPECT_KASAN_FAIL(test, ptr[0] = ptr[size]); |
3f15801c AR |
172 | kfree(ptr); |
173 | } | |
174 | ||
858bdeb0 AK |
175 | /* |
176 | * These kmalloc_pagealloc_* tests try allocating a memory chunk that doesn't | |
177 | * fit into a slab cache and therefore is allocated via the page allocator | |
178 | * fallback. Since this kind of fallback is only implemented for SLUB, these | |
179 | * tests are limited to that allocator. | |
180 | */ | |
73228c7e | 181 | static void kmalloc_pagealloc_oob_right(struct kunit *test) |
3f15801c AR |
182 | { |
183 | char *ptr; | |
184 | size_t size = KMALLOC_MAX_CACHE_SIZE + 10; | |
185 | ||
da17e377 | 186 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB); |
73228c7e | 187 | |
e6e8379c | 188 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 189 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
f33a0149 | 190 | |
d4c1a24f | 191 | OPTIMIZER_HIDE_VAR(ptr); |
73228c7e | 192 | KUNIT_EXPECT_KASAN_FAIL(test, ptr[size + OOB_TAG_OFF] = 0); |
858bdeb0 | 193 | |
e6e8379c AP |
194 | kfree(ptr); |
195 | } | |
47adccce | 196 | |
73228c7e | 197 | static void kmalloc_pagealloc_uaf(struct kunit *test) |
47adccce DV |
198 | { |
199 | char *ptr; | |
200 | size_t size = KMALLOC_MAX_CACHE_SIZE + 10; | |
201 | ||
da17e377 | 202 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB); |
47adccce | 203 | |
73228c7e PA |
204 | ptr = kmalloc(size, GFP_KERNEL); |
205 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
47adccce | 206 | kfree(ptr); |
858bdeb0 | 207 | |
8fbad19b | 208 | KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[0]); |
47adccce DV |
209 | } |
210 | ||
73228c7e | 211 | static void kmalloc_pagealloc_invalid_free(struct kunit *test) |
47adccce DV |
212 | { |
213 | char *ptr; | |
214 | size_t size = KMALLOC_MAX_CACHE_SIZE + 10; | |
215 | ||
da17e377 | 216 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB); |
47adccce | 217 | |
73228c7e PA |
218 | ptr = kmalloc(size, GFP_KERNEL); |
219 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
220 | ||
221 | KUNIT_EXPECT_KASAN_FAIL(test, kfree(ptr + 1)); | |
47adccce | 222 | } |
e6e8379c | 223 | |
858bdeb0 AK |
224 | static void pagealloc_oob_right(struct kunit *test) |
225 | { | |
226 | char *ptr; | |
227 | struct page *pages; | |
228 | size_t order = 4; | |
229 | size_t size = (1UL << (PAGE_SHIFT + order)); | |
230 | ||
231 | /* | |
232 | * With generic KASAN page allocations have no redzones, thus | |
233 | * out-of-bounds detection is not guaranteed. | |
234 | * See https://bugzilla.kernel.org/show_bug.cgi?id=210503. | |
235 | */ | |
236 | KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC); | |
237 | ||
238 | pages = alloc_pages(GFP_KERNEL, order); | |
239 | ptr = page_address(pages); | |
240 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
241 | ||
8fbad19b | 242 | KUNIT_EXPECT_KASAN_FAIL(test, ptr[0] = ptr[size]); |
858bdeb0 AK |
243 | free_pages((unsigned long)ptr, order); |
244 | } | |
245 | ||
246 | static void pagealloc_uaf(struct kunit *test) | |
247 | { | |
248 | char *ptr; | |
249 | struct page *pages; | |
250 | size_t order = 4; | |
251 | ||
252 | pages = alloc_pages(GFP_KERNEL, order); | |
253 | ptr = page_address(pages); | |
254 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
255 | free_pages((unsigned long)ptr, order); | |
256 | ||
8fbad19b | 257 | KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[0]); |
858bdeb0 AK |
258 | } |
259 | ||
73228c7e | 260 | static void kmalloc_large_oob_right(struct kunit *test) |
e6e8379c AP |
261 | { |
262 | char *ptr; | |
263 | size_t size = KMALLOC_MAX_CACHE_SIZE - 256; | |
0fd37925 AK |
264 | |
265 | /* | |
266 | * Allocate a chunk that is large enough, but still fits into a slab | |
e6e8379c AP |
267 | * and does not trigger the page allocator fallback in SLUB. |
268 | */ | |
3f15801c | 269 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 270 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
3f15801c | 271 | |
d4c1a24f | 272 | OPTIMIZER_HIDE_VAR(ptr); |
73228c7e | 273 | KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 0); |
3f15801c AR |
274 | kfree(ptr); |
275 | } | |
276 | ||
b87c28b9 AK |
277 | static void krealloc_more_oob_helper(struct kunit *test, |
278 | size_t size1, size_t size2) | |
3f15801c AR |
279 | { |
280 | char *ptr1, *ptr2; | |
b87c28b9 AK |
281 | size_t middle; |
282 | ||
283 | KUNIT_ASSERT_LT(test, size1, size2); | |
284 | middle = size1 + (size2 - size1) / 2; | |
3f15801c | 285 | |
3f15801c | 286 | ptr1 = kmalloc(size1, GFP_KERNEL); |
73228c7e | 287 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); |
3f15801c | 288 | |
73228c7e PA |
289 | ptr2 = krealloc(ptr1, size2, GFP_KERNEL); |
290 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2); | |
f33a0149 | 291 | |
b87c28b9 AK |
292 | /* All offsets up to size2 must be accessible. */ |
293 | ptr2[size1 - 1] = 'x'; | |
294 | ptr2[size1] = 'x'; | |
295 | ptr2[middle] = 'x'; | |
296 | ptr2[size2 - 1] = 'x'; | |
297 | ||
298 | /* Generic mode is precise, so unaligned size2 must be inaccessible. */ | |
299 | if (IS_ENABLED(CONFIG_KASAN_GENERIC)) | |
300 | KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size2] = 'x'); | |
301 | ||
302 | /* For all modes first aligned offset after size2 must be inaccessible. */ | |
303 | KUNIT_EXPECT_KASAN_FAIL(test, | |
304 | ptr2[round_up(size2, KASAN_GRANULE_SIZE)] = 'x'); | |
305 | ||
3f15801c AR |
306 | kfree(ptr2); |
307 | } | |
308 | ||
b87c28b9 AK |
309 | static void krealloc_less_oob_helper(struct kunit *test, |
310 | size_t size1, size_t size2) | |
3f15801c AR |
311 | { |
312 | char *ptr1, *ptr2; | |
b87c28b9 AK |
313 | size_t middle; |
314 | ||
315 | KUNIT_ASSERT_LT(test, size2, size1); | |
316 | middle = size2 + (size1 - size2) / 2; | |
3f15801c | 317 | |
3f15801c | 318 | ptr1 = kmalloc(size1, GFP_KERNEL); |
73228c7e | 319 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); |
f33a0149 | 320 | |
73228c7e PA |
321 | ptr2 = krealloc(ptr1, size2, GFP_KERNEL); |
322 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2); | |
f33a0149 | 323 | |
b87c28b9 AK |
324 | /* Must be accessible for all modes. */ |
325 | ptr2[size2 - 1] = 'x'; | |
326 | ||
327 | /* Generic mode is precise, so unaligned size2 must be inaccessible. */ | |
328 | if (IS_ENABLED(CONFIG_KASAN_GENERIC)) | |
329 | KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size2] = 'x'); | |
330 | ||
331 | /* For all modes first aligned offset after size2 must be inaccessible. */ | |
332 | KUNIT_EXPECT_KASAN_FAIL(test, | |
333 | ptr2[round_up(size2, KASAN_GRANULE_SIZE)] = 'x'); | |
334 | ||
335 | /* | |
336 | * For all modes all size2, middle, and size1 should land in separate | |
337 | * granules and thus the latter two offsets should be inaccessible. | |
338 | */ | |
339 | KUNIT_EXPECT_LE(test, round_up(size2, KASAN_GRANULE_SIZE), | |
340 | round_down(middle, KASAN_GRANULE_SIZE)); | |
341 | KUNIT_EXPECT_LE(test, round_up(middle, KASAN_GRANULE_SIZE), | |
342 | round_down(size1, KASAN_GRANULE_SIZE)); | |
343 | KUNIT_EXPECT_KASAN_FAIL(test, ptr2[middle] = 'x'); | |
344 | KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size1 - 1] = 'x'); | |
345 | KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size1] = 'x'); | |
346 | ||
3f15801c AR |
347 | kfree(ptr2); |
348 | } | |
349 | ||
b87c28b9 AK |
350 | static void krealloc_more_oob(struct kunit *test) |
351 | { | |
352 | krealloc_more_oob_helper(test, 201, 235); | |
353 | } | |
354 | ||
355 | static void krealloc_less_oob(struct kunit *test) | |
356 | { | |
357 | krealloc_less_oob_helper(test, 235, 201); | |
358 | } | |
359 | ||
360 | static void krealloc_pagealloc_more_oob(struct kunit *test) | |
361 | { | |
362 | /* page_alloc fallback in only implemented for SLUB. */ | |
363 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB); | |
364 | ||
365 | krealloc_more_oob_helper(test, KMALLOC_MAX_CACHE_SIZE + 201, | |
366 | KMALLOC_MAX_CACHE_SIZE + 235); | |
367 | } | |
368 | ||
369 | static void krealloc_pagealloc_less_oob(struct kunit *test) | |
370 | { | |
371 | /* page_alloc fallback in only implemented for SLUB. */ | |
372 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB); | |
373 | ||
374 | krealloc_less_oob_helper(test, KMALLOC_MAX_CACHE_SIZE + 235, | |
375 | KMALLOC_MAX_CACHE_SIZE + 201); | |
376 | } | |
377 | ||
26a5ca7a AK |
378 | /* |
379 | * Check that krealloc() detects a use-after-free, returns NULL, | |
380 | * and doesn't unpoison the freed object. | |
381 | */ | |
382 | static void krealloc_uaf(struct kunit *test) | |
383 | { | |
384 | char *ptr1, *ptr2; | |
385 | int size1 = 201; | |
386 | int size2 = 235; | |
387 | ||
388 | ptr1 = kmalloc(size1, GFP_KERNEL); | |
389 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); | |
390 | kfree(ptr1); | |
391 | ||
392 | KUNIT_EXPECT_KASAN_FAIL(test, ptr2 = krealloc(ptr1, size2, GFP_KERNEL)); | |
393 | KUNIT_ASSERT_PTR_EQ(test, (void *)ptr2, NULL); | |
394 | KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)ptr1); | |
395 | } | |
396 | ||
73228c7e | 397 | static void kmalloc_oob_16(struct kunit *test) |
3f15801c AR |
398 | { |
399 | struct { | |
400 | u64 words[2]; | |
401 | } *ptr1, *ptr2; | |
402 | ||
58b999d7 | 403 | /* This test is specifically crafted for the generic mode. */ |
da17e377 | 404 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC); |
58b999d7 | 405 | |
3f15801c | 406 | ptr1 = kmalloc(sizeof(*ptr1) - 3, GFP_KERNEL); |
73228c7e PA |
407 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); |
408 | ||
3f15801c | 409 | ptr2 = kmalloc(sizeof(*ptr2), GFP_KERNEL); |
73228c7e PA |
410 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2); |
411 | ||
d4c1a24f KC |
412 | OPTIMIZER_HIDE_VAR(ptr1); |
413 | OPTIMIZER_HIDE_VAR(ptr2); | |
73228c7e | 414 | KUNIT_EXPECT_KASAN_FAIL(test, *ptr1 = *ptr2); |
3f15801c AR |
415 | kfree(ptr1); |
416 | kfree(ptr2); | |
417 | } | |
418 | ||
58b999d7 AK |
419 | static void kmalloc_uaf_16(struct kunit *test) |
420 | { | |
421 | struct { | |
422 | u64 words[2]; | |
423 | } *ptr1, *ptr2; | |
424 | ||
425 | ptr1 = kmalloc(sizeof(*ptr1), GFP_KERNEL); | |
426 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); | |
427 | ||
428 | ptr2 = kmalloc(sizeof(*ptr2), GFP_KERNEL); | |
429 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2); | |
430 | kfree(ptr2); | |
431 | ||
432 | KUNIT_EXPECT_KASAN_FAIL(test, *ptr1 = *ptr2); | |
433 | kfree(ptr1); | |
434 | } | |
435 | ||
555999a0 AK |
436 | /* |
437 | * Note: in the memset tests below, the written range touches both valid and | |
438 | * invalid memory. This makes sure that the instrumentation does not only check | |
439 | * the starting address but the whole range. | |
440 | */ | |
441 | ||
73228c7e | 442 | static void kmalloc_oob_memset_2(struct kunit *test) |
f523e737 WL |
443 | { |
444 | char *ptr; | |
555999a0 | 445 | size_t size = 128 - KASAN_GRANULE_SIZE; |
f523e737 | 446 | |
f523e737 | 447 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 448 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
f33a0149 | 449 | |
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 | |
555999a0 | 462 | KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + size - 3, 0, 4)); |
f523e737 WL |
463 | kfree(ptr); |
464 | } | |
465 | ||
73228c7e | 466 | static void kmalloc_oob_memset_8(struct kunit *test) |
f523e737 WL |
467 | { |
468 | char *ptr; | |
555999a0 | 469 | size_t size = 128 - KASAN_GRANULE_SIZE; |
f523e737 | 470 | |
f523e737 | 471 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 472 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
f33a0149 | 473 | |
555999a0 | 474 | KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + size - 7, 0, 8)); |
f523e737 WL |
475 | kfree(ptr); |
476 | } | |
477 | ||
73228c7e | 478 | static void kmalloc_oob_memset_16(struct kunit *test) |
f523e737 WL |
479 | { |
480 | char *ptr; | |
555999a0 | 481 | size_t size = 128 - KASAN_GRANULE_SIZE; |
f523e737 | 482 | |
f523e737 | 483 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 484 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
f33a0149 | 485 | |
555999a0 | 486 | KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + size - 15, 0, 16)); |
f523e737 WL |
487 | kfree(ptr); |
488 | } | |
489 | ||
73228c7e | 490 | static void kmalloc_oob_in_memset(struct kunit *test) |
3f15801c AR |
491 | { |
492 | char *ptr; | |
555999a0 | 493 | size_t size = 128 - KASAN_GRANULE_SIZE; |
3f15801c | 494 | |
3f15801c | 495 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 496 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
f33a0149 | 497 | |
555999a0 AK |
498 | KUNIT_EXPECT_KASAN_FAIL(test, |
499 | memset(ptr, 0, size + KASAN_GRANULE_SIZE)); | |
3f15801c AR |
500 | kfree(ptr); |
501 | } | |
502 | ||
73228c7e | 503 | static void kmalloc_memmove_invalid_size(struct kunit *test) |
98f3b56f WW |
504 | { |
505 | char *ptr; | |
506 | size_t size = 64; | |
507 | volatile size_t invalid_size = -2; | |
508 | ||
1b0668be AK |
509 | /* |
510 | * Hardware tag-based mode doesn't check memmove for negative size. | |
511 | * As a result, this test introduces a side-effect memory corruption, | |
512 | * which can result in a crash. | |
513 | */ | |
514 | KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_HW_TAGS); | |
515 | ||
98f3b56f | 516 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 517 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
98f3b56f WW |
518 | |
519 | memset((char *)ptr, 0, 64); | |
73228c7e PA |
520 | KUNIT_EXPECT_KASAN_FAIL(test, |
521 | memmove((char *)ptr, (char *)ptr + 4, invalid_size)); | |
98f3b56f WW |
522 | kfree(ptr); |
523 | } | |
524 | ||
73228c7e | 525 | static void kmalloc_uaf(struct kunit *test) |
3f15801c AR |
526 | { |
527 | char *ptr; | |
528 | size_t size = 10; | |
529 | ||
3f15801c | 530 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 531 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
3f15801c AR |
532 | |
533 | kfree(ptr); | |
8fbad19b | 534 | KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[8]); |
3f15801c AR |
535 | } |
536 | ||
73228c7e | 537 | static void kmalloc_uaf_memset(struct kunit *test) |
3f15801c AR |
538 | { |
539 | char *ptr; | |
540 | size_t size = 33; | |
541 | ||
25b12a58 AK |
542 | /* |
543 | * Only generic KASAN uses quarantine, which is required to avoid a | |
544 | * kernel memory corruption this test causes. | |
545 | */ | |
546 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC); | |
547 | ||
3f15801c | 548 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 549 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
3f15801c AR |
550 | |
551 | kfree(ptr); | |
73228c7e | 552 | KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr, 0, size)); |
3f15801c AR |
553 | } |
554 | ||
73228c7e | 555 | static void kmalloc_uaf2(struct kunit *test) |
3f15801c AR |
556 | { |
557 | char *ptr1, *ptr2; | |
558 | size_t size = 43; | |
1b1df4c4 | 559 | int counter = 0; |
3f15801c | 560 | |
1b1df4c4 | 561 | again: |
3f15801c | 562 | ptr1 = kmalloc(size, GFP_KERNEL); |
73228c7e | 563 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); |
3f15801c AR |
564 | |
565 | kfree(ptr1); | |
73228c7e | 566 | |
3f15801c | 567 | ptr2 = kmalloc(size, GFP_KERNEL); |
73228c7e PA |
568 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2); |
569 | ||
1b1df4c4 AK |
570 | /* |
571 | * For tag-based KASAN ptr1 and ptr2 tags might happen to be the same. | |
572 | * Allow up to 16 attempts at generating different tags. | |
573 | */ | |
574 | if (!IS_ENABLED(CONFIG_KASAN_GENERIC) && ptr1 == ptr2 && counter++ < 16) { | |
575 | kfree(ptr2); | |
576 | goto again; | |
577 | } | |
578 | ||
8fbad19b | 579 | KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr1)[40]); |
73228c7e | 580 | KUNIT_EXPECT_PTR_NE(test, ptr1, ptr2); |
3f15801c | 581 | |
3f15801c AR |
582 | kfree(ptr2); |
583 | } | |
584 | ||
73228c7e | 585 | static void kfree_via_page(struct kunit *test) |
b92a953c MR |
586 | { |
587 | char *ptr; | |
588 | size_t size = 8; | |
589 | struct page *page; | |
590 | unsigned long offset; | |
591 | ||
b92a953c | 592 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 593 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
b92a953c MR |
594 | |
595 | page = virt_to_page(ptr); | |
596 | offset = offset_in_page(ptr); | |
597 | kfree(page_address(page) + offset); | |
598 | } | |
599 | ||
73228c7e | 600 | static void kfree_via_phys(struct kunit *test) |
b92a953c MR |
601 | { |
602 | char *ptr; | |
603 | size_t size = 8; | |
604 | phys_addr_t phys; | |
605 | ||
b92a953c | 606 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 607 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
b92a953c MR |
608 | |
609 | phys = virt_to_phys(ptr); | |
610 | kfree(phys_to_virt(phys)); | |
611 | } | |
612 | ||
73228c7e | 613 | static void kmem_cache_oob(struct kunit *test) |
3f15801c AR |
614 | { |
615 | char *p; | |
616 | size_t size = 200; | |
11516135 AK |
617 | struct kmem_cache *cache; |
618 | ||
619 | cache = kmem_cache_create("test_cache", size, 0, 0, NULL); | |
73228c7e | 620 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); |
11516135 | 621 | |
3f15801c AR |
622 | p = kmem_cache_alloc(cache, GFP_KERNEL); |
623 | if (!p) { | |
73228c7e | 624 | kunit_err(test, "Allocation failed: %s\n", __func__); |
3f15801c AR |
625 | kmem_cache_destroy(cache); |
626 | return; | |
627 | } | |
628 | ||
73228c7e | 629 | KUNIT_EXPECT_KASAN_FAIL(test, *p = p[size + OOB_TAG_OFF]); |
11516135 | 630 | |
3f15801c AR |
631 | kmem_cache_free(cache, p); |
632 | kmem_cache_destroy(cache); | |
633 | } | |
634 | ||
11516135 | 635 | static void kmem_cache_accounted(struct kunit *test) |
0386bf38 GT |
636 | { |
637 | int i; | |
638 | char *p; | |
639 | size_t size = 200; | |
640 | struct kmem_cache *cache; | |
641 | ||
642 | cache = kmem_cache_create("test_cache", size, 0, SLAB_ACCOUNT, NULL); | |
73228c7e | 643 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); |
0386bf38 | 644 | |
0386bf38 GT |
645 | /* |
646 | * Several allocations with a delay to allow for lazy per memcg kmem | |
647 | * cache creation. | |
648 | */ | |
649 | for (i = 0; i < 5; i++) { | |
650 | p = kmem_cache_alloc(cache, GFP_KERNEL); | |
dc2bf000 | 651 | if (!p) |
0386bf38 | 652 | goto free_cache; |
dc2bf000 | 653 | |
0386bf38 GT |
654 | kmem_cache_free(cache, p); |
655 | msleep(100); | |
656 | } | |
657 | ||
658 | free_cache: | |
659 | kmem_cache_destroy(cache); | |
660 | } | |
661 | ||
11516135 AK |
662 | static void kmem_cache_bulk(struct kunit *test) |
663 | { | |
664 | struct kmem_cache *cache; | |
665 | size_t size = 200; | |
666 | char *p[10]; | |
667 | bool ret; | |
668 | int i; | |
669 | ||
670 | cache = kmem_cache_create("test_cache", size, 0, 0, NULL); | |
671 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); | |
672 | ||
673 | ret = kmem_cache_alloc_bulk(cache, GFP_KERNEL, ARRAY_SIZE(p), (void **)&p); | |
674 | if (!ret) { | |
675 | kunit_err(test, "Allocation failed: %s\n", __func__); | |
676 | kmem_cache_destroy(cache); | |
677 | return; | |
678 | } | |
679 | ||
680 | for (i = 0; i < ARRAY_SIZE(p); i++) | |
681 | p[i][0] = p[i][size - 1] = 42; | |
682 | ||
683 | kmem_cache_free_bulk(cache, ARRAY_SIZE(p), (void **)&p); | |
684 | kmem_cache_destroy(cache); | |
685 | } | |
686 | ||
3f15801c AR |
687 | static char global_array[10]; |
688 | ||
73228c7e | 689 | static void kasan_global_oob(struct kunit *test) |
3f15801c | 690 | { |
f649dc0e PC |
691 | /* |
692 | * Deliberate out-of-bounds access. To prevent CONFIG_UBSAN_LOCAL_BOUNDS | |
53b0fe36 | 693 | * from failing here and panicking the kernel, access the array via a |
f649dc0e PC |
694 | * volatile pointer, which will prevent the compiler from being able to |
695 | * determine the array bounds. | |
696 | * | |
697 | * This access uses a volatile pointer to char (char *volatile) rather | |
698 | * than the more conventional pointer to volatile char (volatile char *) | |
699 | * because we want to prevent the compiler from making inferences about | |
700 | * the pointer itself (i.e. its array bounds), not the data that it | |
701 | * refers to. | |
702 | */ | |
703 | char *volatile array = global_array; | |
704 | char *p = &array[ARRAY_SIZE(global_array) + 3]; | |
3f15801c | 705 | |
58b999d7 | 706 | /* Only generic mode instruments globals. */ |
da17e377 | 707 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC); |
58b999d7 | 708 | |
73228c7e | 709 | KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p); |
3f15801c AR |
710 | } |
711 | ||
611806b4 | 712 | /* Check that ksize() makes the whole object accessible. */ |
73228c7e | 713 | static void ksize_unpoisons_memory(struct kunit *test) |
96fe805f AP |
714 | { |
715 | char *ptr; | |
48c23239 | 716 | size_t size = 123, real_size; |
96fe805f | 717 | |
96fe805f | 718 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 719 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
96fe805f | 720 | real_size = ksize(ptr); |
0fd37925 | 721 | |
d4c1a24f KC |
722 | OPTIMIZER_HIDE_VAR(ptr); |
723 | ||
0fd37925 | 724 | /* This access shouldn't trigger a KASAN report. */ |
96fe805f | 725 | ptr[size] = 'x'; |
0fd37925 AK |
726 | |
727 | /* This one must. */ | |
8fbad19b | 728 | KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[real_size]); |
0fd37925 | 729 | |
96fe805f AP |
730 | kfree(ptr); |
731 | } | |
732 | ||
611806b4 AK |
733 | /* |
734 | * Check that a use-after-free is detected by ksize() and via normal accesses | |
735 | * after it. | |
736 | */ | |
737 | static void ksize_uaf(struct kunit *test) | |
738 | { | |
739 | char *ptr; | |
740 | int size = 128 - KASAN_GRANULE_SIZE; | |
741 | ||
742 | ptr = kmalloc(size, GFP_KERNEL); | |
743 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
744 | kfree(ptr); | |
745 | ||
d4c1a24f | 746 | OPTIMIZER_HIDE_VAR(ptr); |
611806b4 | 747 | KUNIT_EXPECT_KASAN_FAIL(test, ksize(ptr)); |
b38fcca3 AK |
748 | KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[0]); |
749 | KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[size]); | |
611806b4 AK |
750 | } |
751 | ||
73228c7e | 752 | static void kasan_stack_oob(struct kunit *test) |
eae08dca | 753 | { |
73228c7e | 754 | char stack_array[10]; |
f649dc0e PC |
755 | /* See comment in kasan_global_oob. */ |
756 | char *volatile array = stack_array; | |
757 | char *p = &array[ARRAY_SIZE(stack_array) + OOB_TAG_OFF]; | |
eae08dca | 758 | |
da17e377 | 759 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_STACK); |
eae08dca | 760 | |
73228c7e | 761 | KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p); |
eae08dca AR |
762 | } |
763 | ||
73228c7e | 764 | static void kasan_alloca_oob_left(struct kunit *test) |
00a14294 PL |
765 | { |
766 | volatile int i = 10; | |
767 | char alloca_array[i]; | |
f649dc0e PC |
768 | /* See comment in kasan_global_oob. */ |
769 | char *volatile array = alloca_array; | |
770 | char *p = array - 1; | |
00a14294 | 771 | |
58b999d7 | 772 | /* Only generic mode instruments dynamic allocas. */ |
da17e377 AK |
773 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC); |
774 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_STACK); | |
73228c7e PA |
775 | |
776 | KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p); | |
00a14294 PL |
777 | } |
778 | ||
73228c7e | 779 | static void kasan_alloca_oob_right(struct kunit *test) |
00a14294 PL |
780 | { |
781 | volatile int i = 10; | |
782 | char alloca_array[i]; | |
f649dc0e PC |
783 | /* See comment in kasan_global_oob. */ |
784 | char *volatile array = alloca_array; | |
785 | char *p = array + i; | |
00a14294 | 786 | |
58b999d7 | 787 | /* Only generic mode instruments dynamic allocas. */ |
da17e377 AK |
788 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC); |
789 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_STACK); | |
73228c7e PA |
790 | |
791 | KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p); | |
00a14294 PL |
792 | } |
793 | ||
73228c7e | 794 | static void kmem_cache_double_free(struct kunit *test) |
b1d57289 DV |
795 | { |
796 | char *p; | |
797 | size_t size = 200; | |
798 | struct kmem_cache *cache; | |
799 | ||
800 | cache = kmem_cache_create("test_cache", size, 0, 0, NULL); | |
73228c7e PA |
801 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); |
802 | ||
b1d57289 DV |
803 | p = kmem_cache_alloc(cache, GFP_KERNEL); |
804 | if (!p) { | |
73228c7e | 805 | kunit_err(test, "Allocation failed: %s\n", __func__); |
b1d57289 DV |
806 | kmem_cache_destroy(cache); |
807 | return; | |
808 | } | |
809 | ||
810 | kmem_cache_free(cache, p); | |
73228c7e | 811 | KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_free(cache, p)); |
b1d57289 DV |
812 | kmem_cache_destroy(cache); |
813 | } | |
814 | ||
73228c7e | 815 | static void kmem_cache_invalid_free(struct kunit *test) |
b1d57289 DV |
816 | { |
817 | char *p; | |
818 | size_t size = 200; | |
819 | struct kmem_cache *cache; | |
820 | ||
821 | cache = kmem_cache_create("test_cache", size, 0, SLAB_TYPESAFE_BY_RCU, | |
822 | NULL); | |
73228c7e PA |
823 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); |
824 | ||
b1d57289 DV |
825 | p = kmem_cache_alloc(cache, GFP_KERNEL); |
826 | if (!p) { | |
73228c7e | 827 | kunit_err(test, "Allocation failed: %s\n", __func__); |
b1d57289 DV |
828 | kmem_cache_destroy(cache); |
829 | return; | |
830 | } | |
831 | ||
0fd37925 | 832 | /* Trigger invalid free, the object doesn't get freed. */ |
73228c7e | 833 | KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_free(cache, p + 1)); |
91c93ed0 AK |
834 | |
835 | /* | |
836 | * Properly free the object to prevent the "Objects remaining in | |
837 | * test_cache on __kmem_cache_shutdown" BUG failure. | |
838 | */ | |
839 | kmem_cache_free(cache, p); | |
840 | ||
b1d57289 DV |
841 | kmem_cache_destroy(cache); |
842 | } | |
843 | ||
73228c7e | 844 | static void kasan_memchr(struct kunit *test) |
0c96350a AR |
845 | { |
846 | char *ptr; | |
847 | size_t size = 24; | |
848 | ||
0fd37925 AK |
849 | /* |
850 | * str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT. | |
851 | * See https://bugzilla.kernel.org/show_bug.cgi?id=206337 for details. | |
852 | */ | |
da17e377 | 853 | KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_AMD_MEM_ENCRYPT); |
73228c7e | 854 | |
58b999d7 AK |
855 | if (OOB_TAG_OFF) |
856 | size = round_up(size, OOB_TAG_OFF); | |
857 | ||
73228c7e PA |
858 | ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO); |
859 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
860 | ||
861 | KUNIT_EXPECT_KASAN_FAIL(test, | |
862 | kasan_ptr_result = memchr(ptr, '1', size + 1)); | |
0c96350a | 863 | |
0c96350a AR |
864 | kfree(ptr); |
865 | } | |
866 | ||
73228c7e | 867 | static void kasan_memcmp(struct kunit *test) |
0c96350a AR |
868 | { |
869 | char *ptr; | |
870 | size_t size = 24; | |
871 | int arr[9]; | |
872 | ||
0fd37925 AK |
873 | /* |
874 | * str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT. | |
875 | * See https://bugzilla.kernel.org/show_bug.cgi?id=206337 for details. | |
876 | */ | |
da17e377 | 877 | KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_AMD_MEM_ENCRYPT); |
0c96350a | 878 | |
58b999d7 AK |
879 | if (OOB_TAG_OFF) |
880 | size = round_up(size, OOB_TAG_OFF); | |
881 | ||
73228c7e PA |
882 | ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO); |
883 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
0c96350a | 884 | memset(arr, 0, sizeof(arr)); |
73228c7e PA |
885 | |
886 | KUNIT_EXPECT_KASAN_FAIL(test, | |
887 | kasan_int_result = memcmp(ptr, arr, size+1)); | |
0c96350a AR |
888 | kfree(ptr); |
889 | } | |
890 | ||
73228c7e | 891 | static void kasan_strings(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 PA |
901 | |
902 | ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO); | |
903 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
0c96350a AR |
904 | |
905 | kfree(ptr); | |
906 | ||
907 | /* | |
908 | * Try to cause only 1 invalid access (less spam in dmesg). | |
909 | * For that we need ptr to point to zeroed byte. | |
910 | * Skip metadata that could be stored in freed object so ptr | |
911 | * will likely point to zeroed byte. | |
912 | */ | |
913 | ptr += 16; | |
73228c7e | 914 | KUNIT_EXPECT_KASAN_FAIL(test, kasan_ptr_result = strchr(ptr, '1')); |
0c96350a | 915 | |
73228c7e | 916 | KUNIT_EXPECT_KASAN_FAIL(test, kasan_ptr_result = strrchr(ptr, '1')); |
0c96350a | 917 | |
73228c7e | 918 | KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strcmp(ptr, "2")); |
0c96350a | 919 | |
73228c7e | 920 | KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strncmp(ptr, "2", 1)); |
0c96350a | 921 | |
73228c7e | 922 | KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strlen(ptr)); |
0c96350a | 923 | |
73228c7e | 924 | KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strnlen(ptr, 1)); |
0c96350a AR |
925 | } |
926 | ||
58b999d7 AK |
927 | static void kasan_bitops_modify(struct kunit *test, int nr, void *addr) |
928 | { | |
929 | KUNIT_EXPECT_KASAN_FAIL(test, set_bit(nr, addr)); | |
930 | KUNIT_EXPECT_KASAN_FAIL(test, __set_bit(nr, addr)); | |
931 | KUNIT_EXPECT_KASAN_FAIL(test, clear_bit(nr, addr)); | |
932 | KUNIT_EXPECT_KASAN_FAIL(test, __clear_bit(nr, addr)); | |
933 | KUNIT_EXPECT_KASAN_FAIL(test, clear_bit_unlock(nr, addr)); | |
934 | KUNIT_EXPECT_KASAN_FAIL(test, __clear_bit_unlock(nr, addr)); | |
935 | KUNIT_EXPECT_KASAN_FAIL(test, change_bit(nr, addr)); | |
936 | KUNIT_EXPECT_KASAN_FAIL(test, __change_bit(nr, addr)); | |
937 | } | |
938 | ||
939 | static void kasan_bitops_test_and_modify(struct kunit *test, int nr, void *addr) | |
940 | { | |
941 | KUNIT_EXPECT_KASAN_FAIL(test, test_and_set_bit(nr, addr)); | |
942 | KUNIT_EXPECT_KASAN_FAIL(test, __test_and_set_bit(nr, addr)); | |
943 | KUNIT_EXPECT_KASAN_FAIL(test, test_and_set_bit_lock(nr, addr)); | |
944 | KUNIT_EXPECT_KASAN_FAIL(test, test_and_clear_bit(nr, addr)); | |
945 | KUNIT_EXPECT_KASAN_FAIL(test, __test_and_clear_bit(nr, addr)); | |
946 | KUNIT_EXPECT_KASAN_FAIL(test, test_and_change_bit(nr, addr)); | |
947 | KUNIT_EXPECT_KASAN_FAIL(test, __test_and_change_bit(nr, addr)); | |
948 | KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = test_bit(nr, addr)); | |
949 | ||
950 | #if defined(clear_bit_unlock_is_negative_byte) | |
951 | KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = | |
952 | clear_bit_unlock_is_negative_byte(nr, addr)); | |
953 | #endif | |
954 | } | |
955 | ||
956 | static void kasan_bitops_generic(struct kunit *test) | |
19a33ca6 | 957 | { |
58b999d7 AK |
958 | long *bits; |
959 | ||
960 | /* This test is specifically crafted for the generic mode. */ | |
da17e377 | 961 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC); |
58b999d7 | 962 | |
19a33ca6 | 963 | /* |
0fd37925 | 964 | * Allocate 1 more byte, which causes kzalloc to round up to 16 bytes; |
19a33ca6 ME |
965 | * this way we do not actually corrupt other memory. |
966 | */ | |
58b999d7 | 967 | bits = kzalloc(sizeof(*bits) + 1, GFP_KERNEL); |
73228c7e | 968 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, bits); |
19a33ca6 ME |
969 | |
970 | /* | |
971 | * Below calls try to access bit within allocated memory; however, the | |
972 | * below accesses are still out-of-bounds, since bitops are defined to | |
973 | * operate on the whole long the bit is in. | |
974 | */ | |
58b999d7 | 975 | kasan_bitops_modify(test, BITS_PER_LONG, bits); |
19a33ca6 ME |
976 | |
977 | /* | |
978 | * Below calls try to access bit beyond allocated memory. | |
979 | */ | |
58b999d7 | 980 | kasan_bitops_test_and_modify(test, BITS_PER_LONG + BITS_PER_BYTE, bits); |
19a33ca6 | 981 | |
58b999d7 AK |
982 | kfree(bits); |
983 | } | |
19a33ca6 | 984 | |
58b999d7 AK |
985 | static void kasan_bitops_tags(struct kunit *test) |
986 | { | |
987 | long *bits; | |
19a33ca6 | 988 | |
da17e377 AK |
989 | /* This test is specifically crafted for tag-based modes. */ |
990 | KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC); | |
19a33ca6 | 991 | |
e66e1799 AK |
992 | /* kmalloc-64 cache will be used and the last 16 bytes will be the redzone. */ |
993 | bits = kzalloc(48, GFP_KERNEL); | |
58b999d7 | 994 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, bits); |
19a33ca6 | 995 | |
e66e1799 AK |
996 | /* Do the accesses past the 48 allocated bytes, but within the redone. */ |
997 | kasan_bitops_modify(test, BITS_PER_LONG, (void *)bits + 48); | |
998 | kasan_bitops_test_and_modify(test, BITS_PER_LONG + BITS_PER_BYTE, (void *)bits + 48); | |
19a33ca6 | 999 | |
19a33ca6 ME |
1000 | kfree(bits); |
1001 | } | |
1002 | ||
73228c7e | 1003 | static void kmalloc_double_kzfree(struct kunit *test) |
bb104ed7 ME |
1004 | { |
1005 | char *ptr; | |
1006 | size_t size = 16; | |
1007 | ||
bb104ed7 | 1008 | ptr = kmalloc(size, GFP_KERNEL); |
73228c7e | 1009 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
bb104ed7 | 1010 | |
453431a5 | 1011 | kfree_sensitive(ptr); |
73228c7e | 1012 | KUNIT_EXPECT_KASAN_FAIL(test, kfree_sensitive(ptr)); |
bb104ed7 ME |
1013 | } |
1014 | ||
73228c7e | 1015 | static void vmalloc_oob(struct kunit *test) |
06513916 DA |
1016 | { |
1017 | void *area; | |
1018 | ||
da17e377 | 1019 | KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_VMALLOC); |
06513916 DA |
1020 | |
1021 | /* | |
1022 | * We have to be careful not to hit the guard page. | |
1023 | * The MMU will catch that and crash us. | |
1024 | */ | |
1025 | area = vmalloc(3000); | |
73228c7e | 1026 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, area); |
06513916 | 1027 | |
73228c7e | 1028 | KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)area)[3100]); |
06513916 DA |
1029 | vfree(area); |
1030 | } | |
387d6e46 | 1031 | |
573a4809 AK |
1032 | /* |
1033 | * Check that the assigned pointer tag falls within the [KASAN_TAG_MIN, | |
1034 | * KASAN_TAG_KERNEL) range (note: excluding the match-all tag) for tag-based | |
1035 | * modes. | |
1036 | */ | |
1037 | static void match_all_not_assigned(struct kunit *test) | |
1038 | { | |
1039 | char *ptr; | |
1040 | struct page *pages; | |
1041 | int i, size, order; | |
1042 | ||
1043 | KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC); | |
1044 | ||
1045 | for (i = 0; i < 256; i++) { | |
1046 | size = (get_random_int() % 1024) + 1; | |
1047 | ptr = kmalloc(size, GFP_KERNEL); | |
1048 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
1049 | KUNIT_EXPECT_GE(test, (u8)get_tag(ptr), (u8)KASAN_TAG_MIN); | |
1050 | KUNIT_EXPECT_LT(test, (u8)get_tag(ptr), (u8)KASAN_TAG_KERNEL); | |
1051 | kfree(ptr); | |
1052 | } | |
1053 | ||
1054 | for (i = 0; i < 256; i++) { | |
1055 | order = (get_random_int() % 4) + 1; | |
1056 | pages = alloc_pages(GFP_KERNEL, order); | |
1057 | ptr = page_address(pages); | |
1058 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
1059 | KUNIT_EXPECT_GE(test, (u8)get_tag(ptr), (u8)KASAN_TAG_MIN); | |
1060 | KUNIT_EXPECT_LT(test, (u8)get_tag(ptr), (u8)KASAN_TAG_KERNEL); | |
1061 | free_pages((unsigned long)ptr, order); | |
1062 | } | |
1063 | } | |
1064 | ||
1065 | /* Check that 0xff works as a match-all pointer tag for tag-based modes. */ | |
1066 | static void match_all_ptr_tag(struct kunit *test) | |
1067 | { | |
1068 | char *ptr; | |
1069 | u8 tag; | |
1070 | ||
1071 | KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC); | |
1072 | ||
1073 | ptr = kmalloc(128, GFP_KERNEL); | |
1074 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
1075 | ||
1076 | /* Backup the assigned tag. */ | |
1077 | tag = get_tag(ptr); | |
1078 | KUNIT_EXPECT_NE(test, tag, (u8)KASAN_TAG_KERNEL); | |
1079 | ||
1080 | /* Reset the tag to 0xff.*/ | |
1081 | ptr = set_tag(ptr, KASAN_TAG_KERNEL); | |
1082 | ||
1083 | /* This access shouldn't trigger a KASAN report. */ | |
1084 | *ptr = 0; | |
1085 | ||
1086 | /* Recover the pointer tag and free. */ | |
1087 | ptr = set_tag(ptr, tag); | |
1088 | kfree(ptr); | |
1089 | } | |
1090 | ||
1091 | /* Check that there are no match-all memory tags for tag-based modes. */ | |
1092 | static void match_all_mem_tag(struct kunit *test) | |
1093 | { | |
1094 | char *ptr; | |
1095 | int tag; | |
1096 | ||
1097 | KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC); | |
1098 | ||
1099 | ptr = kmalloc(128, GFP_KERNEL); | |
1100 | KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); | |
1101 | KUNIT_EXPECT_NE(test, (u8)get_tag(ptr), (u8)KASAN_TAG_KERNEL); | |
1102 | ||
1103 | /* For each possible tag value not matching the pointer tag. */ | |
1104 | for (tag = KASAN_TAG_MIN; tag <= KASAN_TAG_KERNEL; tag++) { | |
1105 | if (tag == get_tag(ptr)) | |
1106 | continue; | |
1107 | ||
1108 | /* Mark the first memory granule with the chosen memory tag. */ | |
aa5c219c | 1109 | kasan_poison(ptr, KASAN_GRANULE_SIZE, (u8)tag, false); |
573a4809 AK |
1110 | |
1111 | /* This access must cause a KASAN report. */ | |
1112 | KUNIT_EXPECT_KASAN_FAIL(test, *ptr = 0); | |
1113 | } | |
1114 | ||
1115 | /* Recover the memory tag and free. */ | |
aa5c219c | 1116 | kasan_poison(ptr, KASAN_GRANULE_SIZE, get_tag(ptr), false); |
573a4809 AK |
1117 | kfree(ptr); |
1118 | } | |
1119 | ||
73228c7e PA |
1120 | static struct kunit_case kasan_kunit_test_cases[] = { |
1121 | KUNIT_CASE(kmalloc_oob_right), | |
1122 | KUNIT_CASE(kmalloc_oob_left), | |
1123 | KUNIT_CASE(kmalloc_node_oob_right), | |
1124 | KUNIT_CASE(kmalloc_pagealloc_oob_right), | |
1125 | KUNIT_CASE(kmalloc_pagealloc_uaf), | |
1126 | KUNIT_CASE(kmalloc_pagealloc_invalid_free), | |
858bdeb0 AK |
1127 | KUNIT_CASE(pagealloc_oob_right), |
1128 | KUNIT_CASE(pagealloc_uaf), | |
73228c7e | 1129 | KUNIT_CASE(kmalloc_large_oob_right), |
b87c28b9 AK |
1130 | KUNIT_CASE(krealloc_more_oob), |
1131 | KUNIT_CASE(krealloc_less_oob), | |
1132 | KUNIT_CASE(krealloc_pagealloc_more_oob), | |
1133 | KUNIT_CASE(krealloc_pagealloc_less_oob), | |
26a5ca7a | 1134 | KUNIT_CASE(krealloc_uaf), |
73228c7e | 1135 | KUNIT_CASE(kmalloc_oob_16), |
58b999d7 | 1136 | KUNIT_CASE(kmalloc_uaf_16), |
73228c7e PA |
1137 | KUNIT_CASE(kmalloc_oob_in_memset), |
1138 | KUNIT_CASE(kmalloc_oob_memset_2), | |
1139 | KUNIT_CASE(kmalloc_oob_memset_4), | |
1140 | KUNIT_CASE(kmalloc_oob_memset_8), | |
1141 | KUNIT_CASE(kmalloc_oob_memset_16), | |
1142 | KUNIT_CASE(kmalloc_memmove_invalid_size), | |
1143 | KUNIT_CASE(kmalloc_uaf), | |
1144 | KUNIT_CASE(kmalloc_uaf_memset), | |
1145 | KUNIT_CASE(kmalloc_uaf2), | |
1146 | KUNIT_CASE(kfree_via_page), | |
1147 | KUNIT_CASE(kfree_via_phys), | |
1148 | KUNIT_CASE(kmem_cache_oob), | |
11516135 AK |
1149 | KUNIT_CASE(kmem_cache_accounted), |
1150 | KUNIT_CASE(kmem_cache_bulk), | |
73228c7e PA |
1151 | KUNIT_CASE(kasan_global_oob), |
1152 | KUNIT_CASE(kasan_stack_oob), | |
1153 | KUNIT_CASE(kasan_alloca_oob_left), | |
1154 | KUNIT_CASE(kasan_alloca_oob_right), | |
1155 | KUNIT_CASE(ksize_unpoisons_memory), | |
611806b4 | 1156 | KUNIT_CASE(ksize_uaf), |
73228c7e PA |
1157 | KUNIT_CASE(kmem_cache_double_free), |
1158 | KUNIT_CASE(kmem_cache_invalid_free), | |
1159 | KUNIT_CASE(kasan_memchr), | |
1160 | KUNIT_CASE(kasan_memcmp), | |
1161 | KUNIT_CASE(kasan_strings), | |
58b999d7 AK |
1162 | KUNIT_CASE(kasan_bitops_generic), |
1163 | KUNIT_CASE(kasan_bitops_tags), | |
73228c7e PA |
1164 | KUNIT_CASE(kmalloc_double_kzfree), |
1165 | KUNIT_CASE(vmalloc_oob), | |
573a4809 AK |
1166 | KUNIT_CASE(match_all_not_assigned), |
1167 | KUNIT_CASE(match_all_ptr_tag), | |
1168 | KUNIT_CASE(match_all_mem_tag), | |
73228c7e PA |
1169 | {} |
1170 | }; | |
1171 | ||
1172 | static struct kunit_suite kasan_kunit_test_suite = { | |
1173 | .name = "kasan", | |
1174 | .init = kasan_test_init, | |
1175 | .test_cases = kasan_kunit_test_cases, | |
1176 | .exit = kasan_test_exit, | |
1177 | }; | |
1178 | ||
1179 | kunit_test_suite(kasan_kunit_test_suite); | |
3f15801c | 1180 | |
3f15801c | 1181 | MODULE_LICENSE("GPL"); |