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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 | // SPDX-License-Identifier: GPL-2.0 /* * Test cases for memcpy(), memmove(), and memset(). */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <kunit/test.h> #include <linux/device.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/module.h> #include <linux/overflow.h> #include <linux/slab.h> #include <linux/types.h> #include <linux/vmalloc.h> struct some_bytes { union { u8 data[32]; struct { u32 one; u16 two; u8 three; /* 1 byte hole */ u32 four[4]; }; }; }; #define check(instance, v) do { \ BUILD_BUG_ON(sizeof(instance.data) != 32); \ for (size_t i = 0; i < sizeof(instance.data); i++) { \ KUNIT_ASSERT_EQ_MSG(test, instance.data[i], v, \ "line %d: '%s' not initialized to 0x%02x @ %zu (saw 0x%02x)\n", \ __LINE__, #instance, v, i, instance.data[i]); \ } \ } while (0) #define compare(name, one, two) do { \ BUILD_BUG_ON(sizeof(one) != sizeof(two)); \ for (size_t i = 0; i < sizeof(one); i++) { \ KUNIT_EXPECT_EQ_MSG(test, one.data[i], two.data[i], \ "line %d: %s.data[%zu] (0x%02x) != %s.data[%zu] (0x%02x)\n", \ __LINE__, #one, i, one.data[i], #two, i, two.data[i]); \ } \ kunit_info(test, "ok: " TEST_OP "() " name "\n"); \ } while (0) static void memcpy_test(struct kunit *test) { #define TEST_OP "memcpy" struct some_bytes control = { .data = { 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, }, }; struct some_bytes zero = { }; struct some_bytes middle = { .data = { 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, }, }; struct some_bytes three = { .data = { 0x00, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, }, }; struct some_bytes dest = { }; int count; u8 *ptr; /* Verify static initializers. */ check(control, 0x20); check(zero, 0); compare("static initializers", dest, zero); /* Verify assignment. */ dest = control; compare("direct assignment", dest, control); /* Verify complete overwrite. */ memcpy(dest.data, zero.data, sizeof(dest.data)); compare("complete overwrite", dest, zero); /* Verify middle overwrite. */ dest = control; memcpy(dest.data + 12, zero.data, 7); compare("middle overwrite", dest, middle); /* Verify argument side-effects aren't repeated. */ dest = control; ptr = dest.data; count = 1; memcpy(ptr++, zero.data, count++); ptr += 8; memcpy(ptr++, zero.data, count++); compare("argument side-effects", dest, three); #undef TEST_OP } static void memmove_test(struct kunit *test) { #define TEST_OP "memmove" struct some_bytes control = { .data = { 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, }, }; struct some_bytes zero = { }; struct some_bytes middle = { .data = { 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, }, }; struct some_bytes five = { .data = { 0x00, 0x00, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x00, 0x00, 0x00, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, }, }; struct some_bytes overlap = { .data = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, }, }; struct some_bytes overlap_expected = { .data = { 0x00, 0x01, 0x00, 0x01, 0x02, 0x03, 0x04, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, }, }; struct some_bytes dest = { }; int count; u8 *ptr; /* Verify static initializers. */ check(control, 0x99); check(zero, 0); compare("static initializers", zero, dest); /* Verify assignment. */ dest = control; compare("direct assignment", dest, control); /* Verify complete overwrite. */ memmove(dest.data, zero.data, sizeof(dest.data)); compare("complete overwrite", dest, zero); /* Verify middle overwrite. */ dest = control; memmove(dest.data + 12, zero.data, 7); compare("middle overwrite", dest, middle); /* Verify argument side-effects aren't repeated. */ dest = control; ptr = dest.data; count = 2; memmove(ptr++, zero.data, count++); ptr += 9; memmove(ptr++, zero.data, count++); compare("argument side-effects", dest, five); /* Verify overlapping overwrite is correct. */ ptr = &overlap.data[2]; memmove(ptr, overlap.data, 5); compare("overlapping write", overlap, overlap_expected); #undef TEST_OP } static void memset_test(struct kunit *test) { #define TEST_OP "memset" struct some_bytes control = { .data = { 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, }, }; struct some_bytes complete = { .data = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, }, }; struct some_bytes middle = { .data = { 0x30, 0x30, 0x30, 0x30, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, }, }; struct some_bytes three = { .data = { 0x60, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x61, 0x61, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, }, }; struct some_bytes after = { .data = { 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, }, }; struct some_bytes startat = { .data = { 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, }, }; struct some_bytes dest = { }; int count, value; u8 *ptr; /* Verify static initializers. */ check(control, 0x30); check(dest, 0); /* Verify assignment. */ dest = control; compare("direct assignment", dest, control); /* Verify complete overwrite. */ memset(dest.data, 0xff, sizeof(dest.data)); compare("complete overwrite", dest, complete); /* Verify middle overwrite. */ dest = control; memset(dest.data + 4, 0x31, 16); compare("middle overwrite", dest, middle); /* Verify argument side-effects aren't repeated. */ dest = control; ptr = dest.data; value = 0x60; count = 1; memset(ptr++, value++, count++); ptr += 8; memset(ptr++, value++, count++); compare("argument side-effects", dest, three); /* Verify memset_after() */ dest = control; memset_after(&dest, 0x72, three); compare("memset_after()", dest, after); /* Verify memset_startat() */ dest = control; memset_startat(&dest, 0x79, four); compare("memset_startat()", dest, startat); #undef TEST_OP } static void strtomem_test(struct kunit *test) { static const char input[sizeof(unsigned long)] = "hi"; static const char truncate[] = "this is too long"; struct { unsigned long canary1; unsigned char output[sizeof(unsigned long)] __nonstring; unsigned long canary2; } wrap; memset(&wrap, 0xFF, sizeof(wrap)); KUNIT_EXPECT_EQ_MSG(test, wrap.canary1, ULONG_MAX, "bad initial canary value"); KUNIT_EXPECT_EQ_MSG(test, wrap.canary2, ULONG_MAX, "bad initial canary value"); /* Check unpadded copy leaves surroundings untouched. */ strtomem(wrap.output, input); KUNIT_EXPECT_EQ(test, wrap.canary1, ULONG_MAX); KUNIT_EXPECT_EQ(test, wrap.output[0], input[0]); KUNIT_EXPECT_EQ(test, wrap.output[1], input[1]); for (size_t i = 2; i < sizeof(wrap.output); i++) KUNIT_EXPECT_EQ(test, wrap.output[i], 0xFF); KUNIT_EXPECT_EQ(test, wrap.canary2, ULONG_MAX); /* Check truncated copy leaves surroundings untouched. */ memset(&wrap, 0xFF, sizeof(wrap)); strtomem(wrap.output, truncate); KUNIT_EXPECT_EQ(test, wrap.canary1, ULONG_MAX); for (size_t i = 0; i < sizeof(wrap.output); i++) KUNIT_EXPECT_EQ(test, wrap.output[i], truncate[i]); KUNIT_EXPECT_EQ(test, wrap.canary2, ULONG_MAX); /* Check padded copy leaves only string padded. */ memset(&wrap, 0xFF, sizeof(wrap)); strtomem_pad(wrap.output, input, 0xAA); KUNIT_EXPECT_EQ(test, wrap.canary1, ULONG_MAX); KUNIT_EXPECT_EQ(test, wrap.output[0], input[0]); KUNIT_EXPECT_EQ(test, wrap.output[1], input[1]); for (size_t i = 2; i < sizeof(wrap.output); i++) KUNIT_EXPECT_EQ(test, wrap.output[i], 0xAA); KUNIT_EXPECT_EQ(test, wrap.canary2, ULONG_MAX); /* Check truncated padded copy has no padding. */ memset(&wrap, 0xFF, sizeof(wrap)); strtomem(wrap.output, truncate); KUNIT_EXPECT_EQ(test, wrap.canary1, ULONG_MAX); for (size_t i = 0; i < sizeof(wrap.output); i++) KUNIT_EXPECT_EQ(test, wrap.output[i], truncate[i]); KUNIT_EXPECT_EQ(test, wrap.canary2, ULONG_MAX); } static struct kunit_case memcpy_test_cases[] = { KUNIT_CASE(memset_test), KUNIT_CASE(memcpy_test), KUNIT_CASE(memmove_test), KUNIT_CASE(strtomem_test), {} }; static struct kunit_suite memcpy_test_suite = { .name = "memcpy", .test_cases = memcpy_test_cases, }; kunit_test_suite(memcpy_test_suite); MODULE_LICENSE("GPL"); |