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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 | // SPDX-License-Identifier: GPL-2.0 /* * Runtime test cases for CONFIG_FORTIFY_SOURCE that aren't expected to * Oops the kernel on success. (For those, see drivers/misc/lkdtm/fortify.c) * * For corner cases with UBSAN, try testing with: * * ./tools/testing/kunit/kunit.py run --arch=x86_64 \ * --kconfig_add CONFIG_FORTIFY_SOURCE=y \ * --kconfig_add CONFIG_UBSAN=y \ * --kconfig_add CONFIG_UBSAN_TRAP=y \ * --kconfig_add CONFIG_UBSAN_BOUNDS=y \ * --kconfig_add CONFIG_UBSAN_LOCAL_BOUNDS=y \ * --make_options LLVM=1 fortify */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <kunit/test.h> #include <linux/device.h> #include <linux/slab.h> #include <linux/string.h> #include <linux/vmalloc.h> static const char array_of_10[] = "this is 10"; static const char *ptr_of_11 = "this is 11!"; static char array_unknown[] = "compiler thinks I might change"; static void known_sizes_test(struct kunit *test) { KUNIT_EXPECT_EQ(test, __compiletime_strlen("88888888"), 8); KUNIT_EXPECT_EQ(test, __compiletime_strlen(array_of_10), 10); KUNIT_EXPECT_EQ(test, __compiletime_strlen(ptr_of_11), 11); KUNIT_EXPECT_EQ(test, __compiletime_strlen(array_unknown), SIZE_MAX); /* Externally defined and dynamically sized string pointer: */ KUNIT_EXPECT_EQ(test, __compiletime_strlen(test->name), SIZE_MAX); } /* This is volatile so the optimizer can't perform DCE below. */ static volatile int pick; /* Not inline to keep optimizer from figuring out which string we want. */ static noinline size_t want_minus_one(int pick) { const char *str; switch (pick) { case 1: str = "4444"; break; case 2: str = "333"; break; default: str = "1"; break; } return __compiletime_strlen(str); } static void control_flow_split_test(struct kunit *test) { KUNIT_EXPECT_EQ(test, want_minus_one(pick), SIZE_MAX); } #define KUNIT_EXPECT_BOS(test, p, expected, name) \ KUNIT_EXPECT_EQ_MSG(test, __builtin_object_size(p, 1), \ expected, \ "__alloc_size() not working with __bos on " name "\n") #if !__has_builtin(__builtin_dynamic_object_size) #define KUNIT_EXPECT_BDOS(test, p, expected, name) \ /* Silence "unused variable 'expected'" warning. */ \ KUNIT_EXPECT_EQ(test, expected, expected) #else #define KUNIT_EXPECT_BDOS(test, p, expected, name) \ KUNIT_EXPECT_EQ_MSG(test, __builtin_dynamic_object_size(p, 1), \ expected, \ "__alloc_size() not working with __bdos on " name "\n") #endif /* If the execpted size is a constant value, __bos can see it. */ #define check_const(_expected, alloc, free) do { \ size_t expected = (_expected); \ void *p = alloc; \ KUNIT_EXPECT_TRUE_MSG(test, p != NULL, #alloc " failed?!\n"); \ KUNIT_EXPECT_BOS(test, p, expected, #alloc); \ KUNIT_EXPECT_BDOS(test, p, expected, #alloc); \ free; \ } while (0) /* If the execpted size is NOT a constant value, __bos CANNOT see it. */ #define check_dynamic(_expected, alloc, free) do { \ size_t expected = (_expected); \ void *p = alloc; \ KUNIT_EXPECT_TRUE_MSG(test, p != NULL, #alloc " failed?!\n"); \ KUNIT_EXPECT_BOS(test, p, SIZE_MAX, #alloc); \ KUNIT_EXPECT_BDOS(test, p, expected, #alloc); \ free; \ } while (0) /* Assortment of constant-value kinda-edge cases. */ #define CONST_TEST_BODY(TEST_alloc) do { \ /* Special-case vmalloc()-family to skip 0-sized allocs. */ \ if (strcmp(#TEST_alloc, "TEST_vmalloc") != 0) \ TEST_alloc(check_const, 0, 0); \ TEST_alloc(check_const, 1, 1); \ TEST_alloc(check_const, 128, 128); \ TEST_alloc(check_const, 1023, 1023); \ TEST_alloc(check_const, 1025, 1025); \ TEST_alloc(check_const, 4096, 4096); \ TEST_alloc(check_const, 4097, 4097); \ } while (0) static volatile size_t zero_size; static volatile size_t unknown_size = 50; #if !__has_builtin(__builtin_dynamic_object_size) #define DYNAMIC_TEST_BODY(TEST_alloc) \ kunit_skip(test, "Compiler is missing __builtin_dynamic_object_size() support\n") #else #define DYNAMIC_TEST_BODY(TEST_alloc) do { \ size_t size = unknown_size; \ \ /* \ * Expected size is "size" in each test, before it is then \ * internally incremented in each test. Requires we disable \ * -Wunsequenced. \ */ \ TEST_alloc(check_dynamic, size, size++); \ /* Make sure incrementing actually happened. */ \ KUNIT_EXPECT_NE(test, size, unknown_size); \ } while (0) #endif #define DEFINE_ALLOC_SIZE_TEST_PAIR(allocator) \ static void alloc_size_##allocator##_const_test(struct kunit *test) \ { \ CONST_TEST_BODY(TEST_##allocator); \ } \ static void alloc_size_##allocator##_dynamic_test(struct kunit *test) \ { \ DYNAMIC_TEST_BODY(TEST_##allocator); \ } #define TEST_kmalloc(checker, expected_size, alloc_size) do { \ gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; \ void *orig; \ size_t len; \ \ checker(expected_size, kmalloc(alloc_size, gfp), \ kfree(p)); \ checker(expected_size, \ kmalloc_node(alloc_size, gfp, NUMA_NO_NODE), \ kfree(p)); \ checker(expected_size, kzalloc(alloc_size, gfp), \ kfree(p)); \ checker(expected_size, \ kzalloc_node(alloc_size, gfp, NUMA_NO_NODE), \ kfree(p)); \ checker(expected_size, kcalloc(1, alloc_size, gfp), \ kfree(p)); \ checker(expected_size, kcalloc(alloc_size, 1, gfp), \ kfree(p)); \ checker(expected_size, \ kcalloc_node(1, alloc_size, gfp, NUMA_NO_NODE), \ kfree(p)); \ checker(expected_size, \ kcalloc_node(alloc_size, 1, gfp, NUMA_NO_NODE), \ kfree(p)); \ checker(expected_size, kmalloc_array(1, alloc_size, gfp), \ kfree(p)); \ checker(expected_size, kmalloc_array(alloc_size, 1, gfp), \ kfree(p)); \ checker(expected_size, \ kmalloc_array_node(1, alloc_size, gfp, NUMA_NO_NODE), \ kfree(p)); \ checker(expected_size, \ kmalloc_array_node(alloc_size, 1, gfp, NUMA_NO_NODE), \ kfree(p)); \ checker(expected_size, __kmalloc(alloc_size, gfp), \ kfree(p)); \ checker(expected_size, \ __kmalloc_node(alloc_size, gfp, NUMA_NO_NODE), \ kfree(p)); \ \ orig = kmalloc(alloc_size, gfp); \ KUNIT_EXPECT_TRUE(test, orig != NULL); \ checker((expected_size) * 2, \ krealloc(orig, (alloc_size) * 2, gfp), \ kfree(p)); \ orig = kmalloc(alloc_size, gfp); \ KUNIT_EXPECT_TRUE(test, orig != NULL); \ checker((expected_size) * 2, \ krealloc_array(orig, 1, (alloc_size) * 2, gfp), \ kfree(p)); \ orig = kmalloc(alloc_size, gfp); \ KUNIT_EXPECT_TRUE(test, orig != NULL); \ checker((expected_size) * 2, \ krealloc_array(orig, (alloc_size) * 2, 1, gfp), \ kfree(p)); \ \ len = 11; \ /* Using memdup() with fixed size, so force unknown length. */ \ if (!__builtin_constant_p(expected_size)) \ len += zero_size; \ checker(len, kmemdup("hello there", len, gfp), kfree(p)); \ } while (0) DEFINE_ALLOC_SIZE_TEST_PAIR(kmalloc) /* Sizes are in pages, not bytes. */ #define TEST_vmalloc(checker, expected_pages, alloc_pages) do { \ gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; \ checker((expected_pages) * PAGE_SIZE, \ vmalloc((alloc_pages) * PAGE_SIZE), vfree(p)); \ checker((expected_pages) * PAGE_SIZE, \ vzalloc((alloc_pages) * PAGE_SIZE), vfree(p)); \ checker((expected_pages) * PAGE_SIZE, \ __vmalloc((alloc_pages) * PAGE_SIZE, gfp), vfree(p)); \ } while (0) DEFINE_ALLOC_SIZE_TEST_PAIR(vmalloc) /* Sizes are in pages (and open-coded for side-effects), not bytes. */ #define TEST_kvmalloc(checker, expected_pages, alloc_pages) do { \ gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; \ size_t prev_size; \ void *orig; \ \ checker((expected_pages) * PAGE_SIZE, \ kvmalloc((alloc_pages) * PAGE_SIZE, gfp), \ vfree(p)); \ checker((expected_pages) * PAGE_SIZE, \ kvmalloc_node((alloc_pages) * PAGE_SIZE, gfp, NUMA_NO_NODE), \ vfree(p)); \ checker((expected_pages) * PAGE_SIZE, \ kvzalloc((alloc_pages) * PAGE_SIZE, gfp), \ vfree(p)); \ checker((expected_pages) * PAGE_SIZE, \ kvzalloc_node((alloc_pages) * PAGE_SIZE, gfp, NUMA_NO_NODE), \ vfree(p)); \ checker((expected_pages) * PAGE_SIZE, \ kvcalloc(1, (alloc_pages) * PAGE_SIZE, gfp), \ vfree(p)); \ checker((expected_pages) * PAGE_SIZE, \ kvcalloc((alloc_pages) * PAGE_SIZE, 1, gfp), \ vfree(p)); \ checker((expected_pages) * PAGE_SIZE, \ kvmalloc_array(1, (alloc_pages) * PAGE_SIZE, gfp), \ vfree(p)); \ checker((expected_pages) * PAGE_SIZE, \ kvmalloc_array((alloc_pages) * PAGE_SIZE, 1, gfp), \ vfree(p)); \ \ prev_size = (expected_pages) * PAGE_SIZE; \ orig = kvmalloc(prev_size, gfp); \ KUNIT_EXPECT_TRUE(test, orig != NULL); \ checker(((expected_pages) * PAGE_SIZE) * 2, \ kvrealloc(orig, prev_size, \ ((alloc_pages) * PAGE_SIZE) * 2, gfp), \ kvfree(p)); \ } while (0) DEFINE_ALLOC_SIZE_TEST_PAIR(kvmalloc) #define TEST_devm_kmalloc(checker, expected_size, alloc_size) do { \ gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; \ const char dev_name[] = "fortify-test"; \ struct device *dev; \ void *orig; \ size_t len; \ \ /* Create dummy device for devm_kmalloc()-family tests. */ \ dev = root_device_register(dev_name); \ KUNIT_ASSERT_FALSE_MSG(test, IS_ERR(dev), \ "Cannot register test device\n"); \ \ checker(expected_size, devm_kmalloc(dev, alloc_size, gfp), \ devm_kfree(dev, p)); \ checker(expected_size, devm_kzalloc(dev, alloc_size, gfp), \ devm_kfree(dev, p)); \ checker(expected_size, \ devm_kmalloc_array(dev, 1, alloc_size, gfp), \ devm_kfree(dev, p)); \ checker(expected_size, \ devm_kmalloc_array(dev, alloc_size, 1, gfp), \ devm_kfree(dev, p)); \ checker(expected_size, \ devm_kcalloc(dev, 1, alloc_size, gfp), \ devm_kfree(dev, p)); \ checker(expected_size, \ devm_kcalloc(dev, alloc_size, 1, gfp), \ devm_kfree(dev, p)); \ \ orig = devm_kmalloc(dev, alloc_size, gfp); \ KUNIT_EXPECT_TRUE(test, orig != NULL); \ checker((expected_size) * 2, \ devm_krealloc(dev, orig, (alloc_size) * 2, gfp), \ devm_kfree(dev, p)); \ \ len = 4; \ /* Using memdup() with fixed size, so force unknown length. */ \ if (!__builtin_constant_p(expected_size)) \ len += zero_size; \ checker(len, devm_kmemdup(dev, "Ohai", len, gfp), \ devm_kfree(dev, p)); \ \ device_unregister(dev); \ } while (0) DEFINE_ALLOC_SIZE_TEST_PAIR(devm_kmalloc) static struct kunit_case fortify_test_cases[] = { KUNIT_CASE(known_sizes_test), KUNIT_CASE(control_flow_split_test), KUNIT_CASE(alloc_size_kmalloc_const_test), KUNIT_CASE(alloc_size_kmalloc_dynamic_test), KUNIT_CASE(alloc_size_vmalloc_const_test), KUNIT_CASE(alloc_size_vmalloc_dynamic_test), KUNIT_CASE(alloc_size_kvmalloc_const_test), KUNIT_CASE(alloc_size_kvmalloc_dynamic_test), KUNIT_CASE(alloc_size_devm_kmalloc_const_test), KUNIT_CASE(alloc_size_devm_kmalloc_dynamic_test), {} }; static struct kunit_suite fortify_test_suite = { .name = "fortify", .test_cases = fortify_test_cases, }; kunit_test_suite(fortify_test_suite); MODULE_LICENSE("GPL"); |