lib/test_kasan.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *
   4  * Copyright (c) 2014 Samsung Electronics Co., Ltd.
   5  * Author: Andrey Ryabinin <a.ryabinin@samsung.com>
   6  */
   7
   8 #define pr_fmt(fmt) "kasan test: %s " fmt, __func__
   9
  10 #include <linux/bitops.h>
  11 #include <linux/delay.h>
  12 #include <linux/kasan.h>
  13 #include <linux/kernel.h>
  14 #include <linux/mm.h>
  15 #include <linux/mman.h>
  16 #include <linux/module.h>
  17 #include <linux/printk.h>
  18 #include <linux/slab.h>
  19 #include <linux/string.h>
  20 #include <linux/uaccess.h>
  21 #include <linux/io.h>
  22 #include <linux/vmalloc.h>
  23
  24 #include <asm/page.h>
  25
  26 /*
  27  * Note: test functions are marked noinline so that their names appear in
  28  * reports.
  29  */
  30
  31 static noinline void __init kmalloc_oob_right(void)
  32 {
  33         char *ptr;
  34         size_t size = 123;
  35
  36         pr_info("out-of-bounds to right\n");
  37         ptr = kmalloc(size, GFP_KERNEL);
  38         if (!ptr) {
  39                 pr_err("Allocation failed\n");
  40                 return;
  41         }
  42
  43         ptr[size] = 'x';
  44         kfree(ptr);
  45 }
  46
  47 static noinline void __init kmalloc_oob_left(void)
  48 {
  49         char *ptr;
  50         size_t size = 15;
  51
  52         pr_info("out-of-bounds to left\n");
  53         ptr = kmalloc(size, GFP_KERNEL);
  54         if (!ptr) {
  55                 pr_err("Allocation failed\n");
  56                 return;
  57         }
  58
  59         *ptr = *(ptr - 1);
  60         kfree(ptr);
  61 }
  62
  63 static noinline void __init kmalloc_node_oob_right(void)
  64 {
  65         char *ptr;
  66         size_t size = 4096;
  67
  68         pr_info("kmalloc_node(): out-of-bounds to right\n");
  69         ptr = kmalloc_node(size, GFP_KERNEL, 0);
  70         if (!ptr) {
  71                 pr_err("Allocation failed\n");
  72                 return;
  73         }
  74
  75         ptr[size] = 0;
  76         kfree(ptr);
  77 }
  78
  79 #ifdef CONFIG_SLUB
  80 static noinline void __init kmalloc_pagealloc_oob_right(void)
  81 {
  82         char *ptr;
  83         size_t size = KMALLOC_MAX_CACHE_SIZE + 10;
  84
  85         /* Allocate a chunk that does not fit into a SLUB cache to trigger
  86          * the page allocator fallback.
  87          */
  88         pr_info("kmalloc pagealloc allocation: out-of-bounds to right\n");
  89         ptr = kmalloc(size, GFP_KERNEL);
  90         if (!ptr) {
  91                 pr_err("Allocation failed\n");
  92                 return;
  93         }
  94
  95         ptr[size] = 0;
  96         kfree(ptr);
  97 }
  98
  99 static noinline void __init kmalloc_pagealloc_uaf(void)
 100 {
 101         char *ptr;
 102         size_t size = KMALLOC_MAX_CACHE_SIZE + 10;
 103
 104         pr_info("kmalloc pagealloc allocation: use-after-free\n");
 105         ptr = kmalloc(size, GFP_KERNEL);
 106         if (!ptr) {
 107                 pr_err("Allocation failed\n");
 108                 return;
 109         }
 110
 111         kfree(ptr);
 112         ptr[0] = 0;
 113 }
 114
 115 static noinline void __init kmalloc_pagealloc_invalid_free(void)
 116 {
 117         char *ptr;
 118         size_t size = KMALLOC_MAX_CACHE_SIZE + 10;
 119
 120         pr_info("kmalloc pagealloc allocation: invalid-free\n");
 121         ptr = kmalloc(size, GFP_KERNEL);
 122         if (!ptr) {
 123                 pr_err("Allocation failed\n");
 124                 return;
 125         }
 126
 127         kfree(ptr + 1);
 128 }
 129 #endif
 130
 131 static noinline void __init kmalloc_large_oob_right(void)
 132 {
 133         char *ptr;
 134         size_t size = KMALLOC_MAX_CACHE_SIZE - 256;
 135         /* Allocate a chunk that is large enough, but still fits into a slab
 136          * and does not trigger the page allocator fallback in SLUB.
 137          */
 138         pr_info("kmalloc large allocation: out-of-bounds to right\n");
 139         ptr = kmalloc(size, GFP_KERNEL);
 140         if (!ptr) {
 141                 pr_err("Allocation failed\n");
 142                 return;
 143         }
 144
 145         ptr[size] = 0;
 146         kfree(ptr);
 147 }
 148
 149 static noinline void __init kmalloc_oob_krealloc_more(void)
 150 {
 151         char *ptr1, *ptr2;
 152         size_t size1 = 17;
 153         size_t size2 = 19;
 154
 155         pr_info("out-of-bounds after krealloc more\n");
 156         ptr1 = kmalloc(size1, GFP_KERNEL);
 157         ptr2 = krealloc(ptr1, size2, GFP_KERNEL);
 158         if (!ptr1 || !ptr2) {
 159                 pr_err("Allocation failed\n");
 160                 kfree(ptr1);
 161                 kfree(ptr2);
 162                 return;
 163         }
 164
 165         ptr2[size2] = 'x';
 166         kfree(ptr2);
 167 }
 168
 169 static noinline void __init kmalloc_oob_krealloc_less(void)
 170 {
 171         char *ptr1, *ptr2;
 172         size_t size1 = 17;
 173         size_t size2 = 15;
 174
 175         pr_info("out-of-bounds after krealloc less\n");
 176         ptr1 = kmalloc(size1, GFP_KERNEL);
 177         ptr2 = krealloc(ptr1, size2, GFP_KERNEL);
 178         if (!ptr1 || !ptr2) {
 179                 pr_err("Allocation failed\n");
 180                 kfree(ptr1);
 181                 return;
 182         }
 183         ptr2[size2] = 'x';
 184         kfree(ptr2);
 185 }
 186
 187 static noinline void __init kmalloc_oob_16(void)
 188 {
 189         struct {
 190                 u64 words[2];
 191         } *ptr1, *ptr2;
 192
 193         pr_info("kmalloc out-of-bounds for 16-bytes access\n");
 194         ptr1 = kmalloc(sizeof(*ptr1) - 3, GFP_KERNEL);
 195         ptr2 = kmalloc(sizeof(*ptr2), GFP_KERNEL);
 196         if (!ptr1 || !ptr2) {
 197                 pr_err("Allocation failed\n");
 198                 kfree(ptr1);
 199                 kfree(ptr2);
 200                 return;
 201         }
 202         *ptr1 = *ptr2;
 203         kfree(ptr1);
 204         kfree(ptr2);
 205 }
 206
 207 static noinline void __init kmalloc_oob_memset_2(void)
 208 {
 209         char *ptr;
 210         size_t size = 8;
 211
 212         pr_info("out-of-bounds in memset2\n");
 213         ptr = kmalloc(size, GFP_KERNEL);
 214         if (!ptr) {
 215                 pr_err("Allocation failed\n");
 216                 return;
 217         }
 218
 219         memset(ptr+7, 0, 2);
 220         kfree(ptr);
 221 }
 222
 223 static noinline void __init kmalloc_oob_memset_4(void)
 224 {
 225         char *ptr;
 226         size_t size = 8;
 227
 228         pr_info("out-of-bounds in memset4\n");
 229         ptr = kmalloc(size, GFP_KERNEL);
 230         if (!ptr) {
 231                 pr_err("Allocation failed\n");
 232                 return;
 233         }
 234
 235         memset(ptr+5, 0, 4);
 236         kfree(ptr);
 237 }
 238
 239
 240 static noinline void __init kmalloc_oob_memset_8(void)
 241 {
 242         char *ptr;
 243         size_t size = 8;
 244
 245         pr_info("out-of-bounds in memset8\n");
 246         ptr = kmalloc(size, GFP_KERNEL);
 247         if (!ptr) {
 248                 pr_err("Allocation failed\n");
 249                 return;
 250         }
 251
 252         memset(ptr+1, 0, 8);
 253         kfree(ptr);
 254 }
 255
 256 static noinline void __init kmalloc_oob_memset_16(void)
 257 {
 258         char *ptr;
 259         size_t size = 16;
 260
 261         pr_info("out-of-bounds in memset16\n");
 262         ptr = kmalloc(size, GFP_KERNEL);
 263         if (!ptr) {
 264                 pr_err("Allocation failed\n");
 265                 return;
 266         }
 267
 268         memset(ptr+1, 0, 16);
 269         kfree(ptr);
 270 }
 271
 272 static noinline void __init kmalloc_oob_in_memset(void)
 273 {
 274         char *ptr;
 275         size_t size = 666;
 276
 277         pr_info("out-of-bounds in memset\n");
 278         ptr = kmalloc(size, GFP_KERNEL);
 279         if (!ptr) {
 280                 pr_err("Allocation failed\n");
 281                 return;
 282         }
 283
 284         memset(ptr, 0, size+5);
 285         kfree(ptr);
 286 }
 287
 288 static noinline void __init kmalloc_uaf(void)
 289 {
 290         char *ptr;
 291         size_t size = 10;
 292
 293         pr_info("use-after-free\n");
 294         ptr = kmalloc(size, GFP_KERNEL);
 295         if (!ptr) {
 296                 pr_err("Allocation failed\n");
 297                 return;
 298         }
 299
 300         kfree(ptr);
 301         *(ptr + 8) = 'x';
 302 }
 303
 304 static noinline void __init kmalloc_uaf_memset(void)
 305 {
 306         char *ptr;
 307         size_t size = 33;
 308
 309         pr_info("use-after-free in memset\n");
 310         ptr = kmalloc(size, GFP_KERNEL);
 311         if (!ptr) {
 312                 pr_err("Allocation failed\n");
 313                 return;
 314         }
 315
 316         kfree(ptr);
 317         memset(ptr, 0, size);
 318 }
 319
 320 static noinline void __init kmalloc_uaf2(void)
 321 {
 322         char *ptr1, *ptr2;
 323         size_t size = 43;
 324
 325         pr_info("use-after-free after another kmalloc\n");
 326         ptr1 = kmalloc(size, GFP_KERNEL);
 327         if (!ptr1) {
 328                 pr_err("Allocation failed\n");
 329                 return;
 330         }
 331
 332         kfree(ptr1);
 333         ptr2 = kmalloc(size, GFP_KERNEL);
 334         if (!ptr2) {
 335                 pr_err("Allocation failed\n");
 336                 return;
 337         }
 338
 339         ptr1[40] = 'x';
 340         if (ptr1 == ptr2)
 341                 pr_err("Could not detect use-after-free: ptr1 == ptr2\n");
 342         kfree(ptr2);
 343 }
 344
 345 static noinline void __init kfree_via_page(void)
 346 {
 347         char *ptr;
 348         size_t size = 8;
 349         struct page *page;
 350         unsigned long offset;
 351
 352         pr_info("invalid-free false positive (via page)\n");
 353         ptr = kmalloc(size, GFP_KERNEL);
 354         if (!ptr) {
 355                 pr_err("Allocation failed\n");
 356                 return;
 357         }
 358
 359         page = virt_to_page(ptr);
 360         offset = offset_in_page(ptr);
 361         kfree(page_address(page) + offset);
 362 }
 363
 364 static noinline void __init kfree_via_phys(void)
 365 {
 366         char *ptr;
 367         size_t size = 8;
 368         phys_addr_t phys;
 369
 370         pr_info("invalid-free false positive (via phys)\n");
 371         ptr = kmalloc(size, GFP_KERNEL);
 372         if (!ptr) {
 373                 pr_err("Allocation failed\n");
 374                 return;
 375         }
 376
 377         phys = virt_to_phys(ptr);
 378         kfree(phys_to_virt(phys));
 379 }
 380
 381 static noinline void __init kmem_cache_oob(void)
 382 {
 383         char *p;
 384         size_t size = 200;
 385         struct kmem_cache *cache = kmem_cache_create("test_cache",
 386                                                 size, 0,
 387                                                 0, NULL);
 388         if (!cache) {
 389                 pr_err("Cache allocation failed\n");
 390                 return;
 391         }
 392         pr_info("out-of-bounds in kmem_cache_alloc\n");
 393         p = kmem_cache_alloc(cache, GFP_KERNEL);
 394         if (!p) {
 395                 pr_err("Allocation failed\n");
 396                 kmem_cache_destroy(cache);
 397                 return;
 398         }
 399
 400         *p = p[size];
 401         kmem_cache_free(cache, p);
 402         kmem_cache_destroy(cache);
 403 }
 404
 405 static noinline void __init memcg_accounted_kmem_cache(void)
 406 {
 407         int i;
 408         char *p;
 409         size_t size = 200;
 410         struct kmem_cache *cache;
 411
 412         cache = kmem_cache_create("test_cache", size, 0, SLAB_ACCOUNT, NULL);
 413         if (!cache) {
 414                 pr_err("Cache allocation failed\n");
 415                 return;
 416         }
 417
 418         pr_info("allocate memcg accounted object\n");
 419         /*
 420          * Several allocations with a delay to allow for lazy per memcg kmem
 421          * cache creation.
 422          */
 423         for (i = 0; i < 5; i++) {
 424                 p = kmem_cache_alloc(cache, GFP_KERNEL);
 425                 if (!p)
 426                         goto free_cache;
 427
 428                 kmem_cache_free(cache, p);
 429                 msleep(100);
 430         }
 431
 432 free_cache:
 433         kmem_cache_destroy(cache);
 434 }
 435
 436 static char global_array[10];
 437
 438 static noinline void __init kasan_global_oob(void)
 439 {
 440         volatile int i = 3;
 441         char *p = &global_array[ARRAY_SIZE(global_array) + i];
 442
 443         pr_info("out-of-bounds global variable\n");
 444         *(volatile char *)p;
 445 }
 446
 447 static noinline void __init kasan_stack_oob(void)
 448 {
 449         char stack_array[10];
 450         volatile int i = 0;
 451         char *p = &stack_array[ARRAY_SIZE(stack_array) + i];
 452
 453         pr_info("out-of-bounds on stack\n");
 454         *(volatile char *)p;
 455 }
 456
 457 static noinline void __init ksize_unpoisons_memory(void)
 458 {
 459         char *ptr;
 460         size_t size = 123, real_size;
 461
 462         pr_info("ksize() unpoisons the whole allocated chunk\n");
 463         ptr = kmalloc(size, GFP_KERNEL);
 464         if (!ptr) {
 465                 pr_err("Allocation failed\n");
 466                 return;
 467         }
 468         real_size = ksize(ptr);
 469         /* This access doesn't trigger an error. */
 470         ptr[size] = 'x';
 471         /* This one does. */
 472         ptr[real_size] = 'y';
 473         kfree(ptr);
 474 }
 475
 476 static noinline void __init copy_user_test(void)
 477 {
 478         char *kmem;
 479         char __user *usermem;
 480         size_t size = 10;
 481         int unused;
 482
 483         kmem = kmalloc(size, GFP_KERNEL);
 484         if (!kmem)
 485                 return;
 486
 487         usermem = (char __user *)vm_mmap(NULL, 0, PAGE_SIZE,
 488                             PROT_READ | PROT_WRITE | PROT_EXEC,
 489                             MAP_ANONYMOUS | MAP_PRIVATE, 0);
 490         if (IS_ERR(usermem)) {
 491                 pr_err("Failed to allocate user memory\n");
 492                 kfree(kmem);
 493                 return;
 494         }
 495
 496         pr_info("out-of-bounds in copy_from_user()\n");
 497         unused = copy_from_user(kmem, usermem, size + 1);
 498
 499         pr_info("out-of-bounds in copy_to_user()\n");
 500         unused = copy_to_user(usermem, kmem, size + 1);
 501
 502         pr_info("out-of-bounds in __copy_from_user()\n");
 503         unused = __copy_from_user(kmem, usermem, size + 1);
 504
 505         pr_info("out-of-bounds in __copy_to_user()\n");
 506         unused = __copy_to_user(usermem, kmem, size + 1);
 507
 508         pr_info("out-of-bounds in __copy_from_user_inatomic()\n");
 509         unused = __copy_from_user_inatomic(kmem, usermem, size + 1);
 510
 511         pr_info("out-of-bounds in __copy_to_user_inatomic()\n");
 512         unused = __copy_to_user_inatomic(usermem, kmem, size + 1);
 513
 514         pr_info("out-of-bounds in strncpy_from_user()\n");
 515         unused = strncpy_from_user(kmem, usermem, size + 1);
 516
 517         vm_munmap((unsigned long)usermem, PAGE_SIZE);
 518         kfree(kmem);
 519 }
 520
 521 static noinline void __init kasan_alloca_oob_left(void)
 522 {
 523         volatile int i = 10;
 524         char alloca_array[i];
 525         char *p = alloca_array - 1;
 526
 527         pr_info("out-of-bounds to left on alloca\n");
 528         *(volatile char *)p;
 529 }
 530
 531 static noinline void __init kasan_alloca_oob_right(void)
 532 {
 533         volatile int i = 10;
 534         char alloca_array[i];
 535         char *p = alloca_array + i;
 536
 537         pr_info("out-of-bounds to right on alloca\n");
 538         *(volatile char *)p;
 539 }
 540
 541 static noinline void __init kmem_cache_double_free(void)
 542 {
 543         char *p;
 544         size_t size = 200;
 545         struct kmem_cache *cache;
 546
 547         cache = kmem_cache_create("test_cache", size, 0, 0, NULL);
 548         if (!cache) {
 549                 pr_err("Cache allocation failed\n");
 550                 return;
 551         }
 552         pr_info("double-free on heap object\n");
 553         p = kmem_cache_alloc(cache, GFP_KERNEL);
 554         if (!p) {
 555                 pr_err("Allocation failed\n");
 556                 kmem_cache_destroy(cache);
 557                 return;
 558         }
 559
 560         kmem_cache_free(cache, p);
 561         kmem_cache_free(cache, p);
 562         kmem_cache_destroy(cache);
 563 }
 564
 565 static noinline void __init kmem_cache_invalid_free(void)
 566 {
 567         char *p;
 568         size_t size = 200;
 569         struct kmem_cache *cache;
 570
 571         cache = kmem_cache_create("test_cache", size, 0, SLAB_TYPESAFE_BY_RCU,
 572                                   NULL);
 573         if (!cache) {
 574                 pr_err("Cache allocation failed\n");
 575                 return;
 576         }
 577         pr_info("invalid-free of heap object\n");
 578         p = kmem_cache_alloc(cache, GFP_KERNEL);
 579         if (!p) {
 580                 pr_err("Allocation failed\n");
 581                 kmem_cache_destroy(cache);
 582                 return;
 583         }
 584
 585         /* Trigger invalid free, the object doesn't get freed */
 586         kmem_cache_free(cache, p + 1);
 587
 588         /*
 589          * Properly free the object to prevent the "Objects remaining in
 590          * test_cache on __kmem_cache_shutdown" BUG failure.
 591          */
 592         kmem_cache_free(cache, p);
 593
 594         kmem_cache_destroy(cache);
 595 }
 596
 597 static noinline void __init kasan_memchr(void)
 598 {
 599         char *ptr;
 600         size_t size = 24;
 601
 602         pr_info("out-of-bounds in memchr\n");
 603         ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO);
 604         if (!ptr)
 605                 return;
 606
 607         memchr(ptr, '1', size + 1);
 608         kfree(ptr);
 609 }
 610
 611 static noinline void __init kasan_memcmp(void)
 612 {
 613         char *ptr;
 614         size_t size = 24;
 615         int arr[9];
 616
 617         pr_info("out-of-bounds in memcmp\n");
 618         ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO);
 619         if (!ptr)
 620                 return;
 621
 622         memset(arr, 0, sizeof(arr));
 623         memcmp(ptr, arr, size+1);
 624         kfree(ptr);
 625 }
 626
 627 static noinline void __init kasan_strings(void)
 628 {
 629         char *ptr;
 630         size_t size = 24;
 631
 632         pr_info("use-after-free in strchr\n");
 633         ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO);
 634         if (!ptr)
 635                 return;
 636
 637         kfree(ptr);
 638
 639         /*
 640          * Try to cause only 1 invalid access (less spam in dmesg).
 641          * For that we need ptr to point to zeroed byte.
 642          * Skip metadata that could be stored in freed object so ptr
 643          * will likely point to zeroed byte.
 644          */
 645         ptr += 16;
 646         strchr(ptr, '1');
 647
 648         pr_info("use-after-free in strrchr\n");
 649         strrchr(ptr, '1');
 650
 651         pr_info("use-after-free in strcmp\n");
 652         strcmp(ptr, "2");
 653
 654         pr_info("use-after-free in strncmp\n");
 655         strncmp(ptr, "2", 1);
 656
 657         pr_info("use-after-free in strlen\n");
 658         strlen(ptr);
 659
 660         pr_info("use-after-free in strnlen\n");
 661         strnlen(ptr, 1);
 662 }
 663
 664 static noinline void __init kasan_bitops(void)
 665 {
 666         /*
 667          * Allocate 1 more byte, which causes kzalloc to round up to 16-bytes;
 668          * this way we do not actually corrupt other memory.
 669          */
 670         long *bits = kzalloc(sizeof(*bits) + 1, GFP_KERNEL);
 671         if (!bits)
 672                 return;
 673
 674         /*
 675          * Below calls try to access bit within allocated memory; however, the
 676          * below accesses are still out-of-bounds, since bitops are defined to
 677          * operate on the whole long the bit is in.
 678          */
 679         pr_info("out-of-bounds in set_bit\n");
 680         set_bit(BITS_PER_LONG, bits);
 681
 682         pr_info("out-of-bounds in __set_bit\n");
 683         __set_bit(BITS_PER_LONG, bits);
 684
 685         pr_info("out-of-bounds in clear_bit\n");
 686         clear_bit(BITS_PER_LONG, bits);
 687
 688         pr_info("out-of-bounds in __clear_bit\n");
 689         __clear_bit(BITS_PER_LONG, bits);
 690
 691         pr_info("out-of-bounds in clear_bit_unlock\n");
 692         clear_bit_unlock(BITS_PER_LONG, bits);
 693
 694         pr_info("out-of-bounds in __clear_bit_unlock\n");
 695         __clear_bit_unlock(BITS_PER_LONG, bits);
 696
 697         pr_info("out-of-bounds in change_bit\n");
 698         change_bit(BITS_PER_LONG, bits);
 699
 700         pr_info("out-of-bounds in __change_bit\n");
 701         __change_bit(BITS_PER_LONG, bits);
 702
 703         /*
 704          * Below calls try to access bit beyond allocated memory.
 705          */
 706         pr_info("out-of-bounds in test_and_set_bit\n");
 707         test_and_set_bit(BITS_PER_LONG + BITS_PER_BYTE, bits);
 708
 709         pr_info("out-of-bounds in __test_and_set_bit\n");
 710         __test_and_set_bit(BITS_PER_LONG + BITS_PER_BYTE, bits);
 711
 712         pr_info("out-of-bounds in test_and_set_bit_lock\n");
 713         test_and_set_bit_lock(BITS_PER_LONG + BITS_PER_BYTE, bits);
 714
 715         pr_info("out-of-bounds in test_and_clear_bit\n");
 716         test_and_clear_bit(BITS_PER_LONG + BITS_PER_BYTE, bits);
 717
 718         pr_info("out-of-bounds in __test_and_clear_bit\n");
 719         __test_and_clear_bit(BITS_PER_LONG + BITS_PER_BYTE, bits);
 720
 721         pr_info("out-of-bounds in test_and_change_bit\n");
 722         test_and_change_bit(BITS_PER_LONG + BITS_PER_BYTE, bits);
 723
 724         pr_info("out-of-bounds in __test_and_change_bit\n");
 725         __test_and_change_bit(BITS_PER_LONG + BITS_PER_BYTE, bits);
 726
 727         pr_info("out-of-bounds in test_bit\n");
 728         (void)test_bit(BITS_PER_LONG + BITS_PER_BYTE, bits);
 729
 730 #if defined(clear_bit_unlock_is_negative_byte)
 731         pr_info("out-of-bounds in clear_bit_unlock_is_negative_byte\n");
 732         clear_bit_unlock_is_negative_byte(BITS_PER_LONG + BITS_PER_BYTE, bits);
 733 #endif
 734         kfree(bits);
 735 }
 736
 737 static noinline void __init kmalloc_double_kzfree(void)
 738 {
 739         char *ptr;
 740         size_t size = 16;
 741
 742         pr_info("double-free (kzfree)\n");
 743         ptr = kmalloc(size, GFP_KERNEL);
 744         if (!ptr) {
 745                 pr_err("Allocation failed\n");
 746                 return;
 747         }
 748
 749         kzfree(ptr);
 750         kzfree(ptr);
 751 }
 752
 753 #ifdef CONFIG_KASAN_VMALLOC
 754 static noinline void __init vmalloc_oob(void)
 755 {
 756         void *area;
 757
 758         pr_info("vmalloc out-of-bounds\n");
 759
 760         /*
 761          * We have to be careful not to hit the guard page.
 762          * The MMU will catch that and crash us.
 763          */
 764         area = vmalloc(3000);
 765         if (!area) {
 766                 pr_err("Allocation failed\n");
 767                 return;
 768         }
 769
 770         ((volatile char *)area)[3100];
 771         vfree(area);
 772 }
 773 #else
 774 static void __init vmalloc_oob(void) {}
 775 #endif
 776
 777 static int __init kmalloc_tests_init(void)
 778 {
 779         /*
 780          * Temporarily enable multi-shot mode. Otherwise, we'd only get a
 781          * report for the first case.
 782          */
 783         bool multishot = kasan_save_enable_multi_shot();
 784
 785         kmalloc_oob_right();
 786         kmalloc_oob_left();
 787         kmalloc_node_oob_right();
 788 #ifdef CONFIG_SLUB
 789         kmalloc_pagealloc_oob_right();
 790         kmalloc_pagealloc_uaf();
 791         kmalloc_pagealloc_invalid_free();
 792 #endif
 793         kmalloc_large_oob_right();
 794         kmalloc_oob_krealloc_more();
 795         kmalloc_oob_krealloc_less();
 796         kmalloc_oob_16();
 797         kmalloc_oob_in_memset();
 798         kmalloc_oob_memset_2();
 799         kmalloc_oob_memset_4();
 800         kmalloc_oob_memset_8();
 801         kmalloc_oob_memset_16();
 802         kmalloc_uaf();
 803         kmalloc_uaf_memset();
 804         kmalloc_uaf2();
 805         kfree_via_page();
 806         kfree_via_phys();
 807         kmem_cache_oob();
 808         memcg_accounted_kmem_cache();
 809         kasan_stack_oob();
 810         kasan_global_oob();
 811         kasan_alloca_oob_left();
 812         kasan_alloca_oob_right();
 813         ksize_unpoisons_memory();
 814         copy_user_test();
 815         kmem_cache_double_free();
 816         kmem_cache_invalid_free();
 817         kasan_memchr();
 818         kasan_memcmp();
 819         kasan_strings();
 820         kasan_bitops();
 821         kmalloc_double_kzfree();
 822         vmalloc_oob();
 823
 824         kasan_restore_multi_shot(multishot);
 825
 826         return -EAGAIN;
 827 }
 828
 829 module_init(kmalloc_tests_init);
 830 MODULE_LICENSE("GPL");