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