lib/test_printf.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Test cases for printf facility.
   4  */
   5
   6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   7
   8 #include <linux/init.h>
   9 #include <linux/kernel.h>
  10 #include <linux/module.h>
  11 #include <linux/printk.h>
  12 #include <linux/random.h>
  13 #include <linux/rtc.h>
  14 #include <linux/slab.h>
  15 #include <linux/sprintf.h>
  16 #include <linux/string.h>
  17
  18 #include <linux/bitmap.h>
  19 #include <linux/dcache.h>
  20 #include <linux/socket.h>
  21 #include <linux/in.h>
  22
  23 #include <linux/gfp.h>
  24 #include <linux/mm.h>
  25
  26 #include <linux/property.h>
  27
  28 #include "../tools/testing/selftests/kselftest_module.h"
  29
  30 #define BUF_SIZE 256
  31 #define PAD_SIZE 16
  32 #define FILL_CHAR '$'
  33
  34 #define NOWARN(option, comment, block) \
  35         __diag_push(); \
  36         __diag_ignore_all(#option, comment); \
  37         block \
  38         __diag_pop();
  39
  40 KSTM_MODULE_GLOBALS();
  41
  42 static char *test_buffer __initdata;
  43 static char *alloced_buffer __initdata;
  44
  45 static int __printf(4, 0) __init
  46 do_test(int bufsize, const char *expect, int elen,
  47         const char *fmt, va_list ap)
  48 {
  49         va_list aq;
  50         int ret, written;
  51
  52         total_tests++;
  53
  54         memset(alloced_buffer, FILL_CHAR, BUF_SIZE + 2*PAD_SIZE);
  55         va_copy(aq, ap);
  56         ret = vsnprintf(test_buffer, bufsize, fmt, aq);
  57         va_end(aq);
  58
  59         if (ret != elen) {
  60                 pr_warn("vsnprintf(buf, %d, \"%s\", ...) returned %d, expected %d\n",
  61                         bufsize, fmt, ret, elen);
  62                 return 1;
  63         }
  64
  65         if (memchr_inv(alloced_buffer, FILL_CHAR, PAD_SIZE)) {
  66                 pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote before buffer\n", bufsize, fmt);
  67                 return 1;
  68         }
  69
  70         if (!bufsize) {
  71                 if (memchr_inv(test_buffer, FILL_CHAR, BUF_SIZE + PAD_SIZE)) {
  72                         pr_warn("vsnprintf(buf, 0, \"%s\", ...) wrote to buffer\n",
  73                                 fmt);
  74                         return 1;
  75                 }
  76                 return 0;
  77         }
  78
  79         written = min(bufsize-1, elen);
  80         if (test_buffer[written]) {
  81                 pr_warn("vsnprintf(buf, %d, \"%s\", ...) did not nul-terminate buffer\n",
  82                         bufsize, fmt);
  83                 return 1;
  84         }
  85
  86         if (memchr_inv(test_buffer + written + 1, FILL_CHAR, bufsize - (written + 1))) {
  87                 pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote beyond the nul-terminator\n",
  88                         bufsize, fmt);
  89                 return 1;
  90         }
  91
  92         if (memchr_inv(test_buffer + bufsize, FILL_CHAR, BUF_SIZE + PAD_SIZE - bufsize)) {
  93                 pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote beyond buffer\n", bufsize, fmt);
  94                 return 1;
  95         }
  96
  97         if (memcmp(test_buffer, expect, written)) {
  98                 pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote '%s', expected '%.*s'\n",
  99                         bufsize, fmt, test_buffer, written, expect);
 100                 return 1;
 101         }
 102         return 0;
 103 }
 104
 105 static void __printf(3, 4) __init
 106 __test(const char *expect, int elen, const char *fmt, ...)
 107 {
 108         va_list ap;
 109         int rand;
 110         char *p;
 111
 112         if (elen >= BUF_SIZE) {
 113                 pr_err("error in test suite: expected output length %d too long. Format was '%s'.\n",
 114                        elen, fmt);
 115                 failed_tests++;
 116                 return;
 117         }
 118
 119         va_start(ap, fmt);
 120
 121         /*
 122          * Every fmt+args is subjected to four tests: Three where we
 123          * tell vsnprintf varying buffer sizes (plenty, not quite
 124          * enough and 0), and then we also test that kvasprintf would
 125          * be able to print it as expected.
 126          */
 127         failed_tests += do_test(BUF_SIZE, expect, elen, fmt, ap);
 128         rand = get_random_u32_inclusive(1, elen + 1);
 129         /* Since elen < BUF_SIZE, we have 1 <= rand <= BUF_SIZE. */
 130         failed_tests += do_test(rand, expect, elen, fmt, ap);
 131         failed_tests += do_test(0, expect, elen, fmt, ap);
 132
 133         p = kvasprintf(GFP_KERNEL, fmt, ap);
 134         if (p) {
 135                 total_tests++;
 136                 if (memcmp(p, expect, elen+1)) {
 137                         pr_warn("kvasprintf(..., \"%s\", ...) returned '%s', expected '%s'\n",
 138                                 fmt, p, expect);
 139                         failed_tests++;
 140                 }
 141                 kfree(p);
 142         }
 143         va_end(ap);
 144 }
 145
 146 #define test(expect, fmt, ...)                                  \
 147         __test(expect, strlen(expect), fmt, ##__VA_ARGS__)
 148
 149 static void __init
 150 test_basic(void)
 151 {
 152         /* Work around annoying "warning: zero-length gnu_printf format string". */
 153         char nul = '\0';
 154
 155         test("", &nul);
 156         test("100%", "100%%");
 157         test("xxx%yyy", "xxx%cyyy", '%');
 158         __test("xxx\0yyy", 7, "xxx%cyyy", '\0');
 159 }
 160
 161 static void __init
 162 test_number(void)
 163 {
 164         test("0x1234abcd  ", "%#-12x", 0x1234abcd);
 165         test("  0x1234abcd", "%#12x", 0x1234abcd);
 166         test("0|001| 12|+123| 1234|-123|-1234", "%d|%03d|%3d|%+d|% d|%+d|% d", 0, 1, 12, 123, 1234, -123, -1234);
 167         NOWARN(-Wformat, "Intentionally test narrowing conversion specifiers.", {
 168                 test("0|1|1|128|255", "%hhu|%hhu|%hhu|%hhu|%hhu", 0, 1, 257, 128, -1);
 169                 test("0|1|1|-128|-1", "%hhd|%hhd|%hhd|%hhd|%hhd", 0, 1, 257, 128, -1);
 170                 test("2015122420151225", "%ho%ho%#ho", 1037, 5282, -11627);
 171         })
 172         /*
 173          * POSIX/C99: »The result of converting zero with an explicit
 174          * precision of zero shall be no characters.« Hence the output
 175          * from the below test should really be "00|0||| ". However,
 176          * the kernel's printf also produces a single 0 in that
 177          * case. This test case simply documents the current
 178          * behaviour.
 179          */
 180         test("00|0|0|0|0", "%.2d|%.1d|%.0d|%.*d|%1.0d", 0, 0, 0, 0, 0, 0);
 181 }
 182
 183 static void __init
 184 test_string(void)
 185 {
 186         test("", "%s%.0s", "", "123");
 187         test("ABCD|abc|123", "%s|%.3s|%.*s", "ABCD", "abcdef", 3, "123456");
 188         test("1  |  2|3  |  4|5  ", "%-3s|%3s|%-*s|%*s|%*s", "1", "2", 3, "3", 3, "4", -3, "5");
 189         test("1234      ", "%-10.4s", "123456");
 190         test("      1234", "%10.4s", "123456");
 191         /*
 192          * POSIX and C99 say that a negative precision (which is only
 193          * possible to pass via a * argument) should be treated as if
 194          * the precision wasn't present, and that if the precision is
 195          * omitted (as in %.s), the precision should be taken to be
 196          * 0. However, the kernel's printf behave exactly opposite,
 197          * treating a negative precision as 0 and treating an omitted
 198          * precision specifier as if no precision was given.
 199          *
 200          * These test cases document the current behaviour; should
 201          * anyone ever feel the need to follow the standards more
 202          * closely, this can be revisited.
 203          */
 204         test("    ", "%4.*s", -5, "123456");
 205         test("123456", "%.s", "123456");
 206         test("a||", "%.s|%.0s|%.*s", "a", "b", 0, "c");
 207         test("a  |   |   ", "%-3.s|%-3.0s|%-3.*s", "a", "b", 0, "c");
 208 }
 209
 210 #define PLAIN_BUF_SIZE 64       /* leave some space so we don't oops */
 211
 212 #if BITS_PER_LONG == 64
 213
 214 #define PTR_WIDTH 16
 215 #define PTR ((void *)0xffff0123456789abUL)
 216 #define PTR_STR "ffff0123456789ab"
 217 #define PTR_VAL_NO_CRNG "(____ptrval____)"
 218 #define ZEROS "00000000"        /* hex 32 zero bits */
 219 #define ONES "ffffffff"         /* hex 32 one bits */
 220
 221 static int __init
 222 plain_format(void)
 223 {
 224         char buf[PLAIN_BUF_SIZE];
 225         int nchars;
 226
 227         nchars = snprintf(buf, PLAIN_BUF_SIZE, "%p", PTR);
 228
 229         if (nchars != PTR_WIDTH)
 230                 return -1;
 231
 232         if (strncmp(buf, PTR_VAL_NO_CRNG, PTR_WIDTH) == 0) {
 233                 pr_warn("crng possibly not yet initialized. plain 'p' buffer contains \"%s\"",
 234                         PTR_VAL_NO_CRNG);
 235                 return 0;
 236         }
 237
 238         if (strncmp(buf, ZEROS, strlen(ZEROS)) != 0)
 239                 return -1;
 240
 241         return 0;
 242 }
 243
 244 #else
 245
 246 #define PTR_WIDTH 8
 247 #define PTR ((void *)0x456789ab)
 248 #define PTR_STR "456789ab"
 249 #define PTR_VAL_NO_CRNG "(ptrval)"
 250 #define ZEROS ""
 251 #define ONES ""
 252
 253 static int __init
 254 plain_format(void)
 255 {
 256         /* Format is implicitly tested for 32 bit machines by plain_hash() */
 257         return 0;
 258 }
 259
 260 #endif  /* BITS_PER_LONG == 64 */
 261
 262 static int __init
 263 plain_hash_to_buffer(const void *p, char *buf, size_t len)
 264 {
 265         int nchars;
 266
 267         nchars = snprintf(buf, len, "%p", p);
 268
 269         if (nchars != PTR_WIDTH)
 270                 return -1;
 271
 272         if (strncmp(buf, PTR_VAL_NO_CRNG, PTR_WIDTH) == 0) {
 273                 pr_warn("crng possibly not yet initialized. plain 'p' buffer contains \"%s\"",
 274                         PTR_VAL_NO_CRNG);
 275                 return 0;
 276         }
 277
 278         return 0;
 279 }
 280
 281 static int __init
 282 plain_hash(void)
 283 {
 284         char buf[PLAIN_BUF_SIZE];
 285         int ret;
 286
 287         ret = plain_hash_to_buffer(PTR, buf, PLAIN_BUF_SIZE);
 288         if (ret)
 289                 return ret;
 290
 291         if (strncmp(buf, PTR_STR, PTR_WIDTH) == 0)
 292                 return -1;
 293
 294         return 0;
 295 }
 296
 297 /*
 298  * We can't use test() to test %p because we don't know what output to expect
 299  * after an address is hashed.
 300  */
 301 static void __init
 302 plain(void)
 303 {
 304         int err;
 305
 306         if (no_hash_pointers) {
 307                 pr_warn("skipping plain 'p' tests");
 308                 skipped_tests += 2;
 309                 return;
 310         }
 311
 312         err = plain_hash();
 313         if (err) {
 314                 pr_warn("plain 'p' does not appear to be hashed\n");
 315                 failed_tests++;
 316                 return;
 317         }
 318
 319         err = plain_format();
 320         if (err) {
 321                 pr_warn("hashing plain 'p' has unexpected format\n");
 322                 failed_tests++;
 323         }
 324 }
 325
 326 static void __init
 327 test_hashed(const char *fmt, const void *p)
 328 {
 329         char buf[PLAIN_BUF_SIZE];
 330         int ret;
 331
 332         /*
 333          * No need to increase failed test counter since this is assumed
 334          * to be called after plain().
 335          */
 336         ret = plain_hash_to_buffer(p, buf, PLAIN_BUF_SIZE);
 337         if (ret)
 338                 return;
 339
 340         test(buf, fmt, p);
 341 }
 342
 343 /*
 344  * NULL pointers aren't hashed.
 345  */
 346 static void __init
 347 null_pointer(void)
 348 {
 349         test(ZEROS "00000000", "%p", NULL);
 350         test(ZEROS "00000000", "%px", NULL);
 351         test("(null)", "%pE", NULL);
 352 }
 353
 354 /*
 355  * Error pointers aren't hashed.
 356  */
 357 static void __init
 358 error_pointer(void)
 359 {
 360         test(ONES "fffffff5", "%p", ERR_PTR(-11));
 361         test(ONES "fffffff5", "%px", ERR_PTR(-11));
 362         test("(efault)", "%pE", ERR_PTR(-11));
 363 }
 364
 365 #define PTR_INVALID ((void *)0x000000ab)
 366
 367 static void __init
 368 invalid_pointer(void)
 369 {
 370         test_hashed("%p", PTR_INVALID);
 371         test(ZEROS "000000ab", "%px", PTR_INVALID);
 372         test("(efault)", "%pE", PTR_INVALID);
 373 }
 374
 375 static void __init
 376 symbol_ptr(void)
 377 {
 378 }
 379
 380 static void __init
 381 kernel_ptr(void)
 382 {
 383         /* We can't test this without access to kptr_restrict. */
 384 }
 385
 386 static void __init
 387 struct_resource(void)
 388 {
 389         struct resource test_resource = {
 390                 .start = 0xc0ffee00,
 391                 .end = 0xc0ffee00,
 392                 .flags = IORESOURCE_MEM,
 393         };
 394
 395         test("[mem 0xc0ffee00 flags 0x200]",
 396              "%pr", &test_resource);
 397
 398         test_resource = (struct resource) {
 399                 .start = 0xc0ffee,
 400                 .end = 0xba5eba11,
 401                 .flags = IORESOURCE_MEM,
 402         };
 403         test("[mem 0x00c0ffee-0xba5eba11 flags 0x200]",
 404              "%pr", &test_resource);
 405
 406         test_resource = (struct resource) {
 407                 .start = 0xba5eba11,
 408                 .end = 0xc0ffee,
 409                 .flags = IORESOURCE_MEM,
 410         };
 411         test("[mem 0xba5eba11-0x00c0ffee flags 0x200]",
 412              "%pr", &test_resource);
 413
 414         test_resource = (struct resource) {
 415                 .start = 0xba5eba11,
 416                 .end = 0xba5eca11,
 417                 .flags = IORESOURCE_MEM,
 418         };
 419
 420         test("[mem 0xba5eba11-0xba5eca11 flags 0x200]",
 421              "%pr", &test_resource);
 422
 423         test_resource = (struct resource) {
 424                 .start = 0xba11,
 425                 .end = 0xca10,
 426                 .flags = IORESOURCE_IO |
 427                          IORESOURCE_DISABLED |
 428                          IORESOURCE_UNSET,
 429         };
 430
 431         test("[io  size 0x1000 disabled]",
 432              "%pR", &test_resource);
 433 }
 434
 435 static void __init
 436 struct_range(void)
 437 {
 438         struct range test_range = DEFINE_RANGE(0xc0ffee00ba5eba11,
 439                                                0xc0ffee00ba5eba11);
 440         test("[range 0xc0ffee00ba5eba11]", "%pra", &test_range);
 441
 442         test_range = DEFINE_RANGE(0xc0ffee, 0xba5eba11);
 443         test("[range 0x0000000000c0ffee-0x00000000ba5eba11]",
 444              "%pra", &test_range);
 445
 446         test_range = DEFINE_RANGE(0xba5eba11, 0xc0ffee);
 447         test("[range 0x00000000ba5eba11-0x0000000000c0ffee]",
 448              "%pra", &test_range);
 449 }
 450
 451 static void __init
 452 addr(void)
 453 {
 454 }
 455
 456 static void __init
 457 escaped_str(void)
 458 {
 459 }
 460
 461 static void __init
 462 hex_string(void)
 463 {
 464         const char buf[3] = {0xc0, 0xff, 0xee};
 465
 466         test("c0 ff ee|c0:ff:ee|c0-ff-ee|c0ffee",
 467              "%3ph|%3phC|%3phD|%3phN", buf, buf, buf, buf);
 468         test("c0 ff ee|c0:ff:ee|c0-ff-ee|c0ffee",
 469              "%*ph|%*phC|%*phD|%*phN", 3, buf, 3, buf, 3, buf, 3, buf);
 470 }
 471
 472 static void __init
 473 mac(void)
 474 {
 475         const u8 addr[6] = {0x2d, 0x48, 0xd6, 0xfc, 0x7a, 0x05};
 476
 477         test("2d:48:d6:fc:7a:05", "%pM", addr);
 478         test("05:7a:fc:d6:48:2d", "%pMR", addr);
 479         test("2d-48-d6-fc-7a-05", "%pMF", addr);
 480         test("2d48d6fc7a05", "%pm", addr);
 481         test("057afcd6482d", "%pmR", addr);
 482 }
 483
 484 static void __init
 485 ip4(void)
 486 {
 487         struct sockaddr_in sa;
 488
 489         sa.sin_family = AF_INET;
 490         sa.sin_port = cpu_to_be16(12345);
 491         sa.sin_addr.s_addr = cpu_to_be32(0x7f000001);
 492
 493         test("127.000.000.001|127.0.0.1", "%pi4|%pI4", &sa.sin_addr, &sa.sin_addr);
 494         test("127.000.000.001|127.0.0.1", "%piS|%pIS", &sa, &sa);
 495         sa.sin_addr.s_addr = cpu_to_be32(0x01020304);
 496         test("001.002.003.004:12345|1.2.3.4:12345", "%piSp|%pISp", &sa, &sa);
 497 }
 498
 499 static void __init
 500 ip6(void)
 501 {
 502 }
 503
 504 static void __init
 505 ip(void)
 506 {
 507         ip4();
 508         ip6();
 509 }
 510
 511 static void __init
 512 uuid(void)
 513 {
 514         const char uuid[16] = {0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7,
 515                                0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf};
 516
 517         test("00010203-0405-0607-0809-0a0b0c0d0e0f", "%pUb", uuid);
 518         test("00010203-0405-0607-0809-0A0B0C0D0E0F", "%pUB", uuid);
 519         test("03020100-0504-0706-0809-0a0b0c0d0e0f", "%pUl", uuid);
 520         test("03020100-0504-0706-0809-0A0B0C0D0E0F", "%pUL", uuid);
 521 }
 522
 523 static struct dentry test_dentry[4] __initdata = {
 524         { .d_parent = &test_dentry[0],
 525           .d_name = QSTR_INIT(test_dentry[0].d_iname, 3),
 526           .d_iname = "foo" },
 527         { .d_parent = &test_dentry[0],
 528           .d_name = QSTR_INIT(test_dentry[1].d_iname, 5),
 529           .d_iname = "bravo" },
 530         { .d_parent = &test_dentry[1],
 531           .d_name = QSTR_INIT(test_dentry[2].d_iname, 4),
 532           .d_iname = "alfa" },
 533         { .d_parent = &test_dentry[2],
 534           .d_name = QSTR_INIT(test_dentry[3].d_iname, 5),
 535           .d_iname = "romeo" },
 536 };
 537
 538 static void __init
 539 dentry(void)
 540 {
 541         test("foo", "%pd", &test_dentry[0]);
 542         test("foo", "%pd2", &test_dentry[0]);
 543
 544         test("(null)", "%pd", NULL);
 545         test("(efault)", "%pd", PTR_INVALID);
 546         test("(null)", "%pD", NULL);
 547         test("(efault)", "%pD", PTR_INVALID);
 548
 549         test("romeo", "%pd", &test_dentry[3]);
 550         test("alfa/romeo", "%pd2", &test_dentry[3]);
 551         test("bravo/alfa/romeo", "%pd3", &test_dentry[3]);
 552         test("/bravo/alfa/romeo", "%pd4", &test_dentry[3]);
 553         test("/bravo/alfa", "%pd4", &test_dentry[2]);
 554
 555         test("bravo/alfa  |bravo/alfa  ", "%-12pd2|%*pd2", &test_dentry[2], -12, &test_dentry[2]);
 556         test("  bravo/alfa|  bravo/alfa", "%12pd2|%*pd2", &test_dentry[2], 12, &test_dentry[2]);
 557 }
 558
 559 static void __init
 560 struct_va_format(void)
 561 {
 562 }
 563
 564 static void __init
 565 time_and_date(void)
 566 {
 567         /* 1543210543 */
 568         const struct rtc_time tm = {
 569                 .tm_sec = 43,
 570                 .tm_min = 35,
 571                 .tm_hour = 5,
 572                 .tm_mday = 26,
 573                 .tm_mon = 10,
 574                 .tm_year = 118,
 575         };
 576         /* 2019-01-04T15:32:23 */
 577         time64_t t = 1546615943;
 578
 579         test("(%pt?)", "%pt", &tm);
 580         test("2018-11-26T05:35:43", "%ptR", &tm);
 581         test("0118-10-26T05:35:43", "%ptRr", &tm);
 582         test("05:35:43|2018-11-26", "%ptRt|%ptRd", &tm, &tm);
 583         test("05:35:43|0118-10-26", "%ptRtr|%ptRdr", &tm, &tm);
 584         test("05:35:43|2018-11-26", "%ptRttr|%ptRdtr", &tm, &tm);
 585         test("05:35:43 tr|2018-11-26 tr", "%ptRt tr|%ptRd tr", &tm, &tm);
 586
 587         test("2019-01-04T15:32:23", "%ptT", &t);
 588         test("0119-00-04T15:32:23", "%ptTr", &t);
 589         test("15:32:23|2019-01-04", "%ptTt|%ptTd", &t, &t);
 590         test("15:32:23|0119-00-04", "%ptTtr|%ptTdr", &t, &t);
 591
 592         test("2019-01-04 15:32:23", "%ptTs", &t);
 593         test("0119-00-04 15:32:23", "%ptTsr", &t);
 594         test("15:32:23|2019-01-04", "%ptTts|%ptTds", &t, &t);
 595         test("15:32:23|0119-00-04", "%ptTtrs|%ptTdrs", &t, &t);
 596 }
 597
 598 static void __init
 599 struct_clk(void)
 600 {
 601 }
 602
 603 static void __init
 604 large_bitmap(void)
 605 {
 606         const int nbits = 1 << 16;
 607         unsigned long *bits = bitmap_zalloc(nbits, GFP_KERNEL);
 608         if (!bits)
 609                 return;
 610
 611         bitmap_set(bits, 1, 20);
 612         bitmap_set(bits, 60000, 15);
 613         test("1-20,60000-60014", "%*pbl", nbits, bits);
 614         bitmap_free(bits);
 615 }
 616
 617 static void __init
 618 bitmap(void)
 619 {
 620         DECLARE_BITMAP(bits, 20);
 621         const int primes[] = {2,3,5,7,11,13,17,19};
 622         int i;
 623
 624         bitmap_zero(bits, 20);
 625         test("00000|00000", "%20pb|%*pb", bits, 20, bits);
 626         test("|", "%20pbl|%*pbl", bits, 20, bits);
 627
 628         for (i = 0; i < ARRAY_SIZE(primes); ++i)
 629                 set_bit(primes[i], bits);
 630         test("a28ac|a28ac", "%20pb|%*pb", bits, 20, bits);
 631         test("2-3,5,7,11,13,17,19|2-3,5,7,11,13,17,19", "%20pbl|%*pbl", bits, 20, bits);
 632
 633         bitmap_fill(bits, 20);
 634         test("fffff|fffff", "%20pb|%*pb", bits, 20, bits);
 635         test("0-19|0-19", "%20pbl|%*pbl", bits, 20, bits);
 636
 637         large_bitmap();
 638 }
 639
 640 static void __init
 641 netdev_features(void)
 642 {
 643 }
 644
 645 struct page_flags_test {
 646         int width;
 647         int shift;
 648         int mask;
 649         const char *fmt;
 650         const char *name;
 651 };
 652
 653 static const struct page_flags_test pft[] = {
 654         {SECTIONS_WIDTH, SECTIONS_PGSHIFT, SECTIONS_MASK,
 655          "%d", "section"},
 656         {NODES_WIDTH, NODES_PGSHIFT, NODES_MASK,
 657          "%d", "node"},
 658         {ZONES_WIDTH, ZONES_PGSHIFT, ZONES_MASK,
 659          "%d", "zone"},
 660         {LAST_CPUPID_WIDTH, LAST_CPUPID_PGSHIFT, LAST_CPUPID_MASK,
 661          "%#x", "lastcpupid"},
 662         {KASAN_TAG_WIDTH, KASAN_TAG_PGSHIFT, KASAN_TAG_MASK,
 663          "%#x", "kasantag"},
 664 };
 665
 666 static void __init
 667 page_flags_test(int section, int node, int zone, int last_cpupid,
 668                 int kasan_tag, unsigned long flags, const char *name,
 669                 char *cmp_buf)
 670 {
 671         unsigned long values[] = {section, node, zone, last_cpupid, kasan_tag};
 672         unsigned long size;
 673         bool append = false;
 674         int i;
 675
 676         for (i = 0; i < ARRAY_SIZE(values); i++)
 677                 flags |= (values[i] & pft[i].mask) << pft[i].shift;
 678
 679         size = scnprintf(cmp_buf, BUF_SIZE, "%#lx(", flags);
 680         if (flags & PAGEFLAGS_MASK) {
 681                 size += scnprintf(cmp_buf + size, BUF_SIZE - size, "%s", name);
 682                 append = true;
 683         }
 684
 685         for (i = 0; i < ARRAY_SIZE(pft); i++) {
 686                 if (!pft[i].width)
 687                         continue;
 688
 689                 if (append)
 690                         size += scnprintf(cmp_buf + size, BUF_SIZE - size, "|");
 691
 692                 size += scnprintf(cmp_buf + size, BUF_SIZE - size, "%s=",
 693                                 pft[i].name);
 694                 size += scnprintf(cmp_buf + size, BUF_SIZE - size, pft[i].fmt,
 695                                 values[i] & pft[i].mask);
 696                 append = true;
 697         }
 698
 699         snprintf(cmp_buf + size, BUF_SIZE - size, ")");
 700
 701         test(cmp_buf, "%pGp", &flags);
 702 }
 703
 704 static void __init
 705 flags(void)
 706 {
 707         unsigned long flags;
 708         char *cmp_buffer;
 709         gfp_t gfp;
 710
 711         cmp_buffer = kmalloc(BUF_SIZE, GFP_KERNEL);
 712         if (!cmp_buffer)
 713                 return;
 714
 715         flags = 0;
 716         page_flags_test(0, 0, 0, 0, 0, flags, "", cmp_buffer);
 717
 718         flags = 1UL << NR_PAGEFLAGS;
 719         page_flags_test(0, 0, 0, 0, 0, flags, "", cmp_buffer);
 720
 721         flags |= 1UL << PG_uptodate | 1UL << PG_dirty | 1UL << PG_lru
 722                 | 1UL << PG_active | 1UL << PG_swapbacked;
 723         page_flags_test(1, 1, 1, 0x1fffff, 1, flags,
 724                         "uptodate|dirty|lru|active|swapbacked",
 725                         cmp_buffer);
 726
 727         flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC;
 728         test("read|exec|mayread|maywrite|mayexec", "%pGv", &flags);
 729
 730         gfp = GFP_TRANSHUGE;
 731         test("GFP_TRANSHUGE", "%pGg", &gfp);
 732
 733         gfp = GFP_ATOMIC|__GFP_DMA;
 734         test("GFP_ATOMIC|GFP_DMA", "%pGg", &gfp);
 735
 736         gfp = __GFP_HIGH;
 737         test("__GFP_HIGH", "%pGg", &gfp);
 738
 739         /* Any flags not translated by the table should remain numeric */
 740         gfp = ~__GFP_BITS_MASK;
 741         snprintf(cmp_buffer, BUF_SIZE, "%#lx", (unsigned long) gfp);
 742         test(cmp_buffer, "%pGg", &gfp);
 743
 744         snprintf(cmp_buffer, BUF_SIZE, "__GFP_HIGH|%#lx",
 745                                                         (unsigned long) gfp);
 746         gfp |= __GFP_HIGH;
 747         test(cmp_buffer, "%pGg", &gfp);
 748
 749         kfree(cmp_buffer);
 750 }
 751
 752 static void __init fwnode_pointer(void)
 753 {
 754         const struct software_node first = { .name = "first" };
 755         const struct software_node second = { .name = "second", .parent = &first };
 756         const struct software_node third = { .name = "third", .parent = &second };
 757         const struct software_node *group[] = { &first, &second, &third, NULL };
 758         const char * const full_name_second = "first/second";
 759         const char * const full_name_third = "first/second/third";
 760         const char * const second_name = "second";
 761         const char * const third_name = "third";
 762         int rval;
 763
 764         rval = software_node_register_node_group(group);
 765         if (rval) {
 766                 pr_warn("cannot register softnodes; rval %d\n", rval);
 767                 return;
 768         }
 769
 770         test(full_name_second, "%pfw", software_node_fwnode(&second));
 771         test(full_name_third, "%pfw", software_node_fwnode(&third));
 772         test(full_name_third, "%pfwf", software_node_fwnode(&third));
 773         test(second_name, "%pfwP", software_node_fwnode(&second));
 774         test(third_name, "%pfwP", software_node_fwnode(&third));
 775
 776         software_node_unregister_node_group(group);
 777 }
 778
 779 static void __init fourcc_pointer(void)
 780 {
 781         struct {
 782                 u32 code;
 783                 char *str;
 784         } const try[] = {
 785                 { 0x3231564e, "NV12 little-endian (0x3231564e)", },
 786                 { 0xb231564e, "NV12 big-endian (0xb231564e)", },
 787                 { 0x10111213, ".... little-endian (0x10111213)", },
 788                 { 0x20303159, "Y10  little-endian (0x20303159)", },
 789         };
 790         unsigned int i;
 791
 792         for (i = 0; i < ARRAY_SIZE(try); i++)
 793                 test(try[i].str, "%p4cc", &try[i].code);
 794 }
 795
 796 static void __init
 797 errptr(void)
 798 {
 799         test("-1234", "%pe", ERR_PTR(-1234));
 800
 801         /* Check that %pe with a non-ERR_PTR gets treated as ordinary %p. */
 802         BUILD_BUG_ON(IS_ERR(PTR));
 803         test_hashed("%pe", PTR);
 804
 805 #ifdef CONFIG_SYMBOLIC_ERRNAME
 806         test("(-ENOTSOCK)", "(%pe)", ERR_PTR(-ENOTSOCK));
 807         test("(-EAGAIN)", "(%pe)", ERR_PTR(-EAGAIN));
 808         BUILD_BUG_ON(EAGAIN != EWOULDBLOCK);
 809         test("(-EAGAIN)", "(%pe)", ERR_PTR(-EWOULDBLOCK));
 810         test("[-EIO    ]", "[%-8pe]", ERR_PTR(-EIO));
 811         test("[    -EIO]", "[%8pe]", ERR_PTR(-EIO));
 812         test("-EPROBE_DEFER", "%pe", ERR_PTR(-EPROBE_DEFER));
 813 #endif
 814 }
 815
 816 static void __init
 817 test_pointer(void)
 818 {
 819         plain();
 820         null_pointer();
 821         error_pointer();
 822         invalid_pointer();
 823         symbol_ptr();
 824         kernel_ptr();
 825         struct_resource();
 826         struct_range();
 827         addr();
 828         escaped_str();
 829         hex_string();
 830         mac();
 831         ip();
 832         uuid();
 833         dentry();
 834         struct_va_format();
 835         time_and_date();
 836         struct_clk();
 837         bitmap();
 838         netdev_features();
 839         flags();
 840         errptr();
 841         fwnode_pointer();
 842         fourcc_pointer();
 843 }
 844
 845 static void __init selftest(void)
 846 {
 847         alloced_buffer = kmalloc(BUF_SIZE + 2*PAD_SIZE, GFP_KERNEL);
 848         if (!alloced_buffer)
 849                 return;
 850         test_buffer = alloced_buffer + PAD_SIZE;
 851
 852         test_basic();
 853         test_number();
 854         test_string();
 855         test_pointer();
 856
 857         kfree(alloced_buffer);
 858 }
 859
 860 KSTM_MODULE_LOADERS(test_printf);
 861 MODULE_AUTHOR("Rasmus Villemoes <linux@rasmusvillemoes.dk>");
 862 MODULE_DESCRIPTION("Test cases for printf facility");
 863 MODULE_LICENSE("GPL");