1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/lib/vsprintf.c 4 * 5 * Copyright (C) 1991, 1992 Linus Torvalds 6 */ 7 8 /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */ 9 /* 10 * Wirzenius wrote this portably, Torvalds fucked it up :-) 11 */ 12 13 /* 14 * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com> 15 * - changed to provide snprintf and vsnprintf functions 16 * So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de> 17 * - scnprintf and vscnprintf 18 */ 19 20 #include <linux/stdarg.h> 21 #include <linux/build_bug.h> 22 #include <linux/clk.h> 23 #include <linux/clk-provider.h> 24 #include <linux/errname.h> 25 #include <linux/module.h> /* for KSYM_SYMBOL_LEN */ 26 #include <linux/types.h> 27 #include <linux/string.h> 28 #include <linux/ctype.h> 29 #include <linux/kernel.h> 30 #include <linux/kallsyms.h> 31 #include <linux/math64.h> 32 #include <linux/uaccess.h> 33 #include <linux/ioport.h> 34 #include <linux/dcache.h> 35 #include <linux/cred.h> 36 #include <linux/rtc.h> 37 #include <linux/time.h> 38 #include <linux/uuid.h> 39 #include <linux/of.h> 40 #include <net/addrconf.h> 41 #include <linux/siphash.h> 42 #include <linux/compiler.h> 43 #include <linux/property.h> 44 #include <linux/notifier.h> 45 #ifdef CONFIG_BLOCK 46 #include <linux/blkdev.h> 47 #endif 48 49 #include "../mm/internal.h" /* For the trace_print_flags arrays */ 50 51 #include <asm/page.h> /* for PAGE_SIZE */ 52 #include <asm/byteorder.h> /* cpu_to_le16 */ 53 #include <asm/unaligned.h> 54 55 #include <linux/string_helpers.h> 56 #include "kstrtox.h" 57 58 /* Disable pointer hashing if requested */ 59 bool no_hash_pointers __ro_after_init; 60 EXPORT_SYMBOL_GPL(no_hash_pointers); 61 62 static noinline unsigned long long simple_strntoull(const char *startp, size_t max_chars, char **endp, unsigned int base) 63 { 64 const char *cp; 65 unsigned long long result = 0ULL; 66 size_t prefix_chars; 67 unsigned int rv; 68 69 cp = _parse_integer_fixup_radix(startp, &base); 70 prefix_chars = cp - startp; 71 if (prefix_chars < max_chars) { 72 rv = _parse_integer_limit(cp, base, &result, max_chars - prefix_chars); 73 /* FIXME */ 74 cp += (rv & ~KSTRTOX_OVERFLOW); 75 } else { 76 /* Field too short for prefix + digit, skip over without converting */ 77 cp = startp + max_chars; 78 } 79 80 if (endp) 81 *endp = (char *)cp; 82 83 return result; 84 } 85 86 /** 87 * simple_strtoull - convert a string to an unsigned long long 88 * @cp: The start of the string 89 * @endp: A pointer to the end of the parsed string will be placed here 90 * @base: The number base to use 91 * 92 * This function has caveats. Please use kstrtoull instead. 93 */ 94 noinline 95 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) 96 { 97 return simple_strntoull(cp, INT_MAX, endp, base); 98 } 99 EXPORT_SYMBOL(simple_strtoull); 100 101 /** 102 * simple_strtoul - convert a string to an unsigned long 103 * @cp: The start of the string 104 * @endp: A pointer to the end of the parsed string will be placed here 105 * @base: The number base to use 106 * 107 * This function has caveats. Please use kstrtoul instead. 108 */ 109 unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) 110 { 111 return simple_strtoull(cp, endp, base); 112 } 113 EXPORT_SYMBOL(simple_strtoul); 114 115 /** 116 * simple_strtol - convert a string to a signed long 117 * @cp: The start of the string 118 * @endp: A pointer to the end of the parsed string will be placed here 119 * @base: The number base to use 120 * 121 * This function has caveats. Please use kstrtol instead. 122 */ 123 long simple_strtol(const char *cp, char **endp, unsigned int base) 124 { 125 if (*cp == '-') 126 return -simple_strtoul(cp + 1, endp, base); 127 128 return simple_strtoul(cp, endp, base); 129 } 130 EXPORT_SYMBOL(simple_strtol); 131 132 static long long simple_strntoll(const char *cp, size_t max_chars, char **endp, 133 unsigned int base) 134 { 135 /* 136 * simple_strntoull() safely handles receiving max_chars==0 in the 137 * case cp[0] == '-' && max_chars == 1. 138 * If max_chars == 0 we can drop through and pass it to simple_strntoull() 139 * and the content of *cp is irrelevant. 140 */ 141 if (*cp == '-' && max_chars > 0) 142 return -simple_strntoull(cp + 1, max_chars - 1, endp, base); 143 144 return simple_strntoull(cp, max_chars, endp, base); 145 } 146 147 /** 148 * simple_strtoll - convert a string to a signed long long 149 * @cp: The start of the string 150 * @endp: A pointer to the end of the parsed string will be placed here 151 * @base: The number base to use 152 * 153 * This function has caveats. Please use kstrtoll instead. 154 */ 155 long long simple_strtoll(const char *cp, char **endp, unsigned int base) 156 { 157 return simple_strntoll(cp, INT_MAX, endp, base); 158 } 159 EXPORT_SYMBOL(simple_strtoll); 160 161 static noinline_for_stack 162 int skip_atoi(const char **s) 163 { 164 int i = 0; 165 166 do { 167 i = i*10 + *((*s)++) - '0'; 168 } while (isdigit(**s)); 169 170 return i; 171 } 172 173 /* 174 * Decimal conversion is by far the most typical, and is used for 175 * /proc and /sys data. This directly impacts e.g. top performance 176 * with many processes running. We optimize it for speed by emitting 177 * two characters at a time, using a 200 byte lookup table. This 178 * roughly halves the number of multiplications compared to computing 179 * the digits one at a time. Implementation strongly inspired by the 180 * previous version, which in turn used ideas described at 181 * <http://www.cs.uiowa.edu/~jones/bcd/divide.html> (with permission 182 * from the author, Douglas W. Jones). 183 * 184 * It turns out there is precisely one 26 bit fixed-point 185 * approximation a of 64/100 for which x/100 == (x * (u64)a) >> 32 186 * holds for all x in [0, 10^8-1], namely a = 0x28f5c29. The actual 187 * range happens to be somewhat larger (x <= 1073741898), but that's 188 * irrelevant for our purpose. 189 * 190 * For dividing a number in the range [10^4, 10^6-1] by 100, we still 191 * need a 32x32->64 bit multiply, so we simply use the same constant. 192 * 193 * For dividing a number in the range [100, 10^4-1] by 100, there are 194 * several options. The simplest is (x * 0x147b) >> 19, which is valid 195 * for all x <= 43698. 196 */ 197 198 static const u16 decpair[100] = { 199 #define _(x) (__force u16) cpu_to_le16(((x % 10) | ((x / 10) << 8)) + 0x3030) 200 _( 0), _( 1), _( 2), _( 3), _( 4), _( 5), _( 6), _( 7), _( 8), _( 9), 201 _(10), _(11), _(12), _(13), _(14), _(15), _(16), _(17), _(18), _(19), 202 _(20), _(21), _(22), _(23), _(24), _(25), _(26), _(27), _(28), _(29), 203 _(30), _(31), _(32), _(33), _(34), _(35), _(36), _(37), _(38), _(39), 204 _(40), _(41), _(42), _(43), _(44), _(45), _(46), _(47), _(48), _(49), 205 _(50), _(51), _(52), _(53), _(54), _(55), _(56), _(57), _(58), _(59), 206 _(60), _(61), _(62), _(63), _(64), _(65), _(66), _(67), _(68), _(69), 207 _(70), _(71), _(72), _(73), _(74), _(75), _(76), _(77), _(78), _(79), 208 _(80), _(81), _(82), _(83), _(84), _(85), _(86), _(87), _(88), _(89), 209 _(90), _(91), _(92), _(93), _(94), _(95), _(96), _(97), _(98), _(99), 210 #undef _ 211 }; 212 213 /* 214 * This will print a single '0' even if r == 0, since we would 215 * immediately jump to out_r where two 0s would be written but only 216 * one of them accounted for in buf. This is needed by ip4_string 217 * below. All other callers pass a non-zero value of r. 218 */ 219 static noinline_for_stack 220 char *put_dec_trunc8(char *buf, unsigned r) 221 { 222 unsigned q; 223 224 /* 1 <= r < 10^8 */ 225 if (r < 100) 226 goto out_r; 227 228 /* 100 <= r < 10^8 */ 229 q = (r * (u64)0x28f5c29) >> 32; 230 *((u16 *)buf) = decpair[r - 100*q]; 231 buf += 2; 232 233 /* 1 <= q < 10^6 */ 234 if (q < 100) 235 goto out_q; 236 237 /* 100 <= q < 10^6 */ 238 r = (q * (u64)0x28f5c29) >> 32; 239 *((u16 *)buf) = decpair[q - 100*r]; 240 buf += 2; 241 242 /* 1 <= r < 10^4 */ 243 if (r < 100) 244 goto out_r; 245 246 /* 100 <= r < 10^4 */ 247 q = (r * 0x147b) >> 19; 248 *((u16 *)buf) = decpair[r - 100*q]; 249 buf += 2; 250 out_q: 251 /* 1 <= q < 100 */ 252 r = q; 253 out_r: 254 /* 1 <= r < 100 */ 255 *((u16 *)buf) = decpair[r]; 256 buf += r < 10 ? 1 : 2; 257 return buf; 258 } 259 260 #if BITS_PER_LONG == 64 && BITS_PER_LONG_LONG == 64 261 static noinline_for_stack 262 char *put_dec_full8(char *buf, unsigned r) 263 { 264 unsigned q; 265 266 /* 0 <= r < 10^8 */ 267 q = (r * (u64)0x28f5c29) >> 32; 268 *((u16 *)buf) = decpair[r - 100*q]; 269 buf += 2; 270 271 /* 0 <= q < 10^6 */ 272 r = (q * (u64)0x28f5c29) >> 32; 273 *((u16 *)buf) = decpair[q - 100*r]; 274 buf += 2; 275 276 /* 0 <= r < 10^4 */ 277 q = (r * 0x147b) >> 19; 278 *((u16 *)buf) = decpair[r - 100*q]; 279 buf += 2; 280 281 /* 0 <= q < 100 */ 282 *((u16 *)buf) = decpair[q]; 283 buf += 2; 284 return buf; 285 } 286 287 static noinline_for_stack 288 char *put_dec(char *buf, unsigned long long n) 289 { 290 if (n >= 100*1000*1000) 291 buf = put_dec_full8(buf, do_div(n, 100*1000*1000)); 292 /* 1 <= n <= 1.6e11 */ 293 if (n >= 100*1000*1000) 294 buf = put_dec_full8(buf, do_div(n, 100*1000*1000)); 295 /* 1 <= n < 1e8 */ 296 return put_dec_trunc8(buf, n); 297 } 298 299 #elif BITS_PER_LONG == 32 && BITS_PER_LONG_LONG == 64 300 301 static void 302 put_dec_full4(char *buf, unsigned r) 303 { 304 unsigned q; 305 306 /* 0 <= r < 10^4 */ 307 q = (r * 0x147b) >> 19; 308 *((u16 *)buf) = decpair[r - 100*q]; 309 buf += 2; 310 /* 0 <= q < 100 */ 311 *((u16 *)buf) = decpair[q]; 312 } 313 314 /* 315 * Call put_dec_full4 on x % 10000, return x / 10000. 316 * The approximation x/10000 == (x * 0x346DC5D7) >> 43 317 * holds for all x < 1,128,869,999. The largest value this 318 * helper will ever be asked to convert is 1,125,520,955. 319 * (second call in the put_dec code, assuming n is all-ones). 320 */ 321 static noinline_for_stack 322 unsigned put_dec_helper4(char *buf, unsigned x) 323 { 324 uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43; 325 326 put_dec_full4(buf, x - q * 10000); 327 return q; 328 } 329 330 /* Based on code by Douglas W. Jones found at 331 * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour> 332 * (with permission from the author). 333 * Performs no 64-bit division and hence should be fast on 32-bit machines. 334 */ 335 static 336 char *put_dec(char *buf, unsigned long long n) 337 { 338 uint32_t d3, d2, d1, q, h; 339 340 if (n < 100*1000*1000) 341 return put_dec_trunc8(buf, n); 342 343 d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */ 344 h = (n >> 32); 345 d2 = (h ) & 0xffff; 346 d3 = (h >> 16); /* implicit "& 0xffff" */ 347 348 /* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0 349 = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */ 350 q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff); 351 q = put_dec_helper4(buf, q); 352 353 q += 7671 * d3 + 9496 * d2 + 6 * d1; 354 q = put_dec_helper4(buf+4, q); 355 356 q += 4749 * d3 + 42 * d2; 357 q = put_dec_helper4(buf+8, q); 358 359 q += 281 * d3; 360 buf += 12; 361 if (q) 362 buf = put_dec_trunc8(buf, q); 363 else while (buf[-1] == '0') 364 --buf; 365 366 return buf; 367 } 368 369 #endif 370 371 /* 372 * Convert passed number to decimal string. 373 * Returns the length of string. On buffer overflow, returns 0. 374 * 375 * If speed is not important, use snprintf(). It's easy to read the code. 376 */ 377 int num_to_str(char *buf, int size, unsigned long long num, unsigned int width) 378 { 379 /* put_dec requires 2-byte alignment of the buffer. */ 380 char tmp[sizeof(num) * 3] __aligned(2); 381 int idx, len; 382 383 /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */ 384 if (num <= 9) { 385 tmp[0] = '0' + num; 386 len = 1; 387 } else { 388 len = put_dec(tmp, num) - tmp; 389 } 390 391 if (len > size || width > size) 392 return 0; 393 394 if (width > len) { 395 width = width - len; 396 for (idx = 0; idx < width; idx++) 397 buf[idx] = ' '; 398 } else { 399 width = 0; 400 } 401 402 for (idx = 0; idx < len; ++idx) 403 buf[idx + width] = tmp[len - idx - 1]; 404 405 return len + width; 406 } 407 408 #define SIGN 1 /* unsigned/signed, must be 1 */ 409 #define LEFT 2 /* left justified */ 410 #define PLUS 4 /* show plus */ 411 #define SPACE 8 /* space if plus */ 412 #define ZEROPAD 16 /* pad with zero, must be 16 == '0' - ' ' */ 413 #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ 414 #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ 415 416 static_assert(SIGN == 1); 417 static_assert(ZEROPAD == ('0' - ' ')); 418 static_assert(SMALL == ('a' ^ 'A')); 419 420 enum format_type { 421 FORMAT_TYPE_NONE, /* Just a string part */ 422 FORMAT_TYPE_WIDTH, 423 FORMAT_TYPE_PRECISION, 424 FORMAT_TYPE_CHAR, 425 FORMAT_TYPE_STR, 426 FORMAT_TYPE_PTR, 427 FORMAT_TYPE_PERCENT_CHAR, 428 FORMAT_TYPE_INVALID, 429 FORMAT_TYPE_LONG_LONG, 430 FORMAT_TYPE_ULONG, 431 FORMAT_TYPE_LONG, 432 FORMAT_TYPE_UBYTE, 433 FORMAT_TYPE_BYTE, 434 FORMAT_TYPE_USHORT, 435 FORMAT_TYPE_SHORT, 436 FORMAT_TYPE_UINT, 437 FORMAT_TYPE_INT, 438 FORMAT_TYPE_SIZE_T, 439 FORMAT_TYPE_PTRDIFF 440 }; 441 442 struct printf_spec { 443 unsigned int type:8; /* format_type enum */ 444 signed int field_width:24; /* width of output field */ 445 unsigned int flags:8; /* flags to number() */ 446 unsigned int base:8; /* number base, 8, 10 or 16 only */ 447 signed int precision:16; /* # of digits/chars */ 448 } __packed; 449 static_assert(sizeof(struct printf_spec) == 8); 450 451 #define FIELD_WIDTH_MAX ((1 << 23) - 1) 452 #define PRECISION_MAX ((1 << 15) - 1) 453 454 static noinline_for_stack 455 char *number(char *buf, char *end, unsigned long long num, 456 struct printf_spec spec) 457 { 458 /* put_dec requires 2-byte alignment of the buffer. */ 459 char tmp[3 * sizeof(num)] __aligned(2); 460 char sign; 461 char locase; 462 int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); 463 int i; 464 bool is_zero = num == 0LL; 465 int field_width = spec.field_width; 466 int precision = spec.precision; 467 468 /* locase = 0 or 0x20. ORing digits or letters with 'locase' 469 * produces same digits or (maybe lowercased) letters */ 470 locase = (spec.flags & SMALL); 471 if (spec.flags & LEFT) 472 spec.flags &= ~ZEROPAD; 473 sign = 0; 474 if (spec.flags & SIGN) { 475 if ((signed long long)num < 0) { 476 sign = '-'; 477 num = -(signed long long)num; 478 field_width--; 479 } else if (spec.flags & PLUS) { 480 sign = '+'; 481 field_width--; 482 } else if (spec.flags & SPACE) { 483 sign = ' '; 484 field_width--; 485 } 486 } 487 if (need_pfx) { 488 if (spec.base == 16) 489 field_width -= 2; 490 else if (!is_zero) 491 field_width--; 492 } 493 494 /* generate full string in tmp[], in reverse order */ 495 i = 0; 496 if (num < spec.base) 497 tmp[i++] = hex_asc_upper[num] | locase; 498 else if (spec.base != 10) { /* 8 or 16 */ 499 int mask = spec.base - 1; 500 int shift = 3; 501 502 if (spec.base == 16) 503 shift = 4; 504 do { 505 tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase); 506 num >>= shift; 507 } while (num); 508 } else { /* base 10 */ 509 i = put_dec(tmp, num) - tmp; 510 } 511 512 /* printing 100 using %2d gives "100", not "00" */ 513 if (i > precision) 514 precision = i; 515 /* leading space padding */ 516 field_width -= precision; 517 if (!(spec.flags & (ZEROPAD | LEFT))) { 518 while (--field_width >= 0) { 519 if (buf < end) 520 *buf = ' '; 521 ++buf; 522 } 523 } 524 /* sign */ 525 if (sign) { 526 if (buf < end) 527 *buf = sign; 528 ++buf; 529 } 530 /* "0x" / "0" prefix */ 531 if (need_pfx) { 532 if (spec.base == 16 || !is_zero) { 533 if (buf < end) 534 *buf = '0'; 535 ++buf; 536 } 537 if (spec.base == 16) { 538 if (buf < end) 539 *buf = ('X' | locase); 540 ++buf; 541 } 542 } 543 /* zero or space padding */ 544 if (!(spec.flags & LEFT)) { 545 char c = ' ' + (spec.flags & ZEROPAD); 546 547 while (--field_width >= 0) { 548 if (buf < end) 549 *buf = c; 550 ++buf; 551 } 552 } 553 /* hmm even more zero padding? */ 554 while (i <= --precision) { 555 if (buf < end) 556 *buf = '0'; 557 ++buf; 558 } 559 /* actual digits of result */ 560 while (--i >= 0) { 561 if (buf < end) 562 *buf = tmp[i]; 563 ++buf; 564 } 565 /* trailing space padding */ 566 while (--field_width >= 0) { 567 if (buf < end) 568 *buf = ' '; 569 ++buf; 570 } 571 572 return buf; 573 } 574 575 static noinline_for_stack 576 char *special_hex_number(char *buf, char *end, unsigned long long num, int size) 577 { 578 struct printf_spec spec; 579 580 spec.type = FORMAT_TYPE_PTR; 581 spec.field_width = 2 + 2 * size; /* 0x + hex */ 582 spec.flags = SPECIAL | SMALL | ZEROPAD; 583 spec.base = 16; 584 spec.precision = -1; 585 586 return number(buf, end, num, spec); 587 } 588 589 static void move_right(char *buf, char *end, unsigned len, unsigned spaces) 590 { 591 size_t size; 592 if (buf >= end) /* nowhere to put anything */ 593 return; 594 size = end - buf; 595 if (size <= spaces) { 596 memset(buf, ' ', size); 597 return; 598 } 599 if (len) { 600 if (len > size - spaces) 601 len = size - spaces; 602 memmove(buf + spaces, buf, len); 603 } 604 memset(buf, ' ', spaces); 605 } 606 607 /* 608 * Handle field width padding for a string. 609 * @buf: current buffer position 610 * @n: length of string 611 * @end: end of output buffer 612 * @spec: for field width and flags 613 * Returns: new buffer position after padding. 614 */ 615 static noinline_for_stack 616 char *widen_string(char *buf, int n, char *end, struct printf_spec spec) 617 { 618 unsigned spaces; 619 620 if (likely(n >= spec.field_width)) 621 return buf; 622 /* we want to pad the sucker */ 623 spaces = spec.field_width - n; 624 if (!(spec.flags & LEFT)) { 625 move_right(buf - n, end, n, spaces); 626 return buf + spaces; 627 } 628 while (spaces--) { 629 if (buf < end) 630 *buf = ' '; 631 ++buf; 632 } 633 return buf; 634 } 635 636 /* Handle string from a well known address. */ 637 static char *string_nocheck(char *buf, char *end, const char *s, 638 struct printf_spec spec) 639 { 640 int len = 0; 641 int lim = spec.precision; 642 643 while (lim--) { 644 char c = *s++; 645 if (!c) 646 break; 647 if (buf < end) 648 *buf = c; 649 ++buf; 650 ++len; 651 } 652 return widen_string(buf, len, end, spec); 653 } 654 655 static char *err_ptr(char *buf, char *end, void *ptr, 656 struct printf_spec spec) 657 { 658 int err = PTR_ERR(ptr); 659 const char *sym = errname(err); 660 661 if (sym) 662 return string_nocheck(buf, end, sym, spec); 663 664 /* 665 * Somebody passed ERR_PTR(-1234) or some other non-existing 666 * Efoo - or perhaps CONFIG_SYMBOLIC_ERRNAME=n. Fall back to 667 * printing it as its decimal representation. 668 */ 669 spec.flags |= SIGN; 670 spec.base = 10; 671 return number(buf, end, err, spec); 672 } 673 674 /* Be careful: error messages must fit into the given buffer. */ 675 static char *error_string(char *buf, char *end, const char *s, 676 struct printf_spec spec) 677 { 678 /* 679 * Hard limit to avoid a completely insane messages. It actually 680 * works pretty well because most error messages are in 681 * the many pointer format modifiers. 682 */ 683 if (spec.precision == -1) 684 spec.precision = 2 * sizeof(void *); 685 686 return string_nocheck(buf, end, s, spec); 687 } 688 689 /* 690 * Do not call any complex external code here. Nested printk()/vsprintf() 691 * might cause infinite loops. Failures might break printk() and would 692 * be hard to debug. 693 */ 694 static const char *check_pointer_msg(const void *ptr) 695 { 696 if (!ptr) 697 return "(null)"; 698 699 if ((unsigned long)ptr < PAGE_SIZE || IS_ERR_VALUE(ptr)) 700 return "(efault)"; 701 702 return NULL; 703 } 704 705 static int check_pointer(char **buf, char *end, const void *ptr, 706 struct printf_spec spec) 707 { 708 const char *err_msg; 709 710 err_msg = check_pointer_msg(ptr); 711 if (err_msg) { 712 *buf = error_string(*buf, end, err_msg, spec); 713 return -EFAULT; 714 } 715 716 return 0; 717 } 718 719 static noinline_for_stack 720 char *string(char *buf, char *end, const char *s, 721 struct printf_spec spec) 722 { 723 if (check_pointer(&buf, end, s, spec)) 724 return buf; 725 726 return string_nocheck(buf, end, s, spec); 727 } 728 729 static char *pointer_string(char *buf, char *end, 730 const void *ptr, 731 struct printf_spec spec) 732 { 733 spec.base = 16; 734 spec.flags |= SMALL; 735 if (spec.field_width == -1) { 736 spec.field_width = 2 * sizeof(ptr); 737 spec.flags |= ZEROPAD; 738 } 739 740 return number(buf, end, (unsigned long int)ptr, spec); 741 } 742 743 /* Make pointers available for printing early in the boot sequence. */ 744 static int debug_boot_weak_hash __ro_after_init; 745 746 static int __init debug_boot_weak_hash_enable(char *str) 747 { 748 debug_boot_weak_hash = 1; 749 pr_info("debug_boot_weak_hash enabled\n"); 750 return 0; 751 } 752 early_param("debug_boot_weak_hash", debug_boot_weak_hash_enable); 753 754 static bool filled_random_ptr_key __read_mostly; 755 static siphash_key_t ptr_key __read_mostly; 756 757 static int fill_ptr_key(struct notifier_block *nb, unsigned long action, void *data) 758 { 759 get_random_bytes(&ptr_key, sizeof(ptr_key)); 760 761 /* Pairs with smp_rmb() before reading ptr_key. */ 762 smp_wmb(); 763 WRITE_ONCE(filled_random_ptr_key, true); 764 return NOTIFY_DONE; 765 } 766 767 static int __init vsprintf_init_hashval(void) 768 { 769 static struct notifier_block fill_ptr_key_nb = { .notifier_call = fill_ptr_key }; 770 execute_with_initialized_rng(&fill_ptr_key_nb); 771 return 0; 772 } 773 subsys_initcall(vsprintf_init_hashval) 774 775 /* Maps a pointer to a 32 bit unique identifier. */ 776 static inline int __ptr_to_hashval(const void *ptr, unsigned long *hashval_out) 777 { 778 unsigned long hashval; 779 780 if (!READ_ONCE(filled_random_ptr_key)) 781 return -EBUSY; 782 783 /* Pairs with smp_wmb() after writing ptr_key. */ 784 smp_rmb(); 785 786 #ifdef CONFIG_64BIT 787 hashval = (unsigned long)siphash_1u64((u64)ptr, &ptr_key); 788 /* 789 * Mask off the first 32 bits, this makes explicit that we have 790 * modified the address (and 32 bits is plenty for a unique ID). 791 */ 792 hashval = hashval & 0xffffffff; 793 #else 794 hashval = (unsigned long)siphash_1u32((u32)ptr, &ptr_key); 795 #endif 796 *hashval_out = hashval; 797 return 0; 798 } 799 800 int ptr_to_hashval(const void *ptr, unsigned long *hashval_out) 801 { 802 return __ptr_to_hashval(ptr, hashval_out); 803 } 804 805 static char *ptr_to_id(char *buf, char *end, const void *ptr, 806 struct printf_spec spec) 807 { 808 const char *str = sizeof(ptr) == 8 ? "(____ptrval____)" : "(ptrval)"; 809 unsigned long hashval; 810 int ret; 811 812 /* 813 * Print the real pointer value for NULL and error pointers, 814 * as they are not actual addresses. 815 */ 816 if (IS_ERR_OR_NULL(ptr)) 817 return pointer_string(buf, end, ptr, spec); 818 819 /* When debugging early boot use non-cryptographically secure hash. */ 820 if (unlikely(debug_boot_weak_hash)) { 821 hashval = hash_long((unsigned long)ptr, 32); 822 return pointer_string(buf, end, (const void *)hashval, spec); 823 } 824 825 ret = __ptr_to_hashval(ptr, &hashval); 826 if (ret) { 827 spec.field_width = 2 * sizeof(ptr); 828 /* string length must be less than default_width */ 829 return error_string(buf, end, str, spec); 830 } 831 832 return pointer_string(buf, end, (const void *)hashval, spec); 833 } 834 835 static char *default_pointer(char *buf, char *end, const void *ptr, 836 struct printf_spec spec) 837 { 838 /* 839 * default is to _not_ leak addresses, so hash before printing, 840 * unless no_hash_pointers is specified on the command line. 841 */ 842 if (unlikely(no_hash_pointers)) 843 return pointer_string(buf, end, ptr, spec); 844 845 return ptr_to_id(buf, end, ptr, spec); 846 } 847 848 int kptr_restrict __read_mostly; 849 850 static noinline_for_stack 851 char *restricted_pointer(char *buf, char *end, const void *ptr, 852 struct printf_spec spec) 853 { 854 switch (kptr_restrict) { 855 case 0: 856 /* Handle as %p, hash and do _not_ leak addresses. */ 857 return default_pointer(buf, end, ptr, spec); 858 case 1: { 859 const struct cred *cred; 860 861 /* 862 * kptr_restrict==1 cannot be used in IRQ context 863 * because its test for CAP_SYSLOG would be meaningless. 864 */ 865 if (in_hardirq() || in_serving_softirq() || in_nmi()) { 866 if (spec.field_width == -1) 867 spec.field_width = 2 * sizeof(ptr); 868 return error_string(buf, end, "pK-error", spec); 869 } 870 871 /* 872 * Only print the real pointer value if the current 873 * process has CAP_SYSLOG and is running with the 874 * same credentials it started with. This is because 875 * access to files is checked at open() time, but %pK 876 * checks permission at read() time. We don't want to 877 * leak pointer values if a binary opens a file using 878 * %pK and then elevates privileges before reading it. 879 */ 880 cred = current_cred(); 881 if (!has_capability_noaudit(current, CAP_SYSLOG) || 882 !uid_eq(cred->euid, cred->uid) || 883 !gid_eq(cred->egid, cred->gid)) 884 ptr = NULL; 885 break; 886 } 887 case 2: 888 default: 889 /* Always print 0's for %pK */ 890 ptr = NULL; 891 break; 892 } 893 894 return pointer_string(buf, end, ptr, spec); 895 } 896 897 static noinline_for_stack 898 char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec, 899 const char *fmt) 900 { 901 const char *array[4], *s; 902 const struct dentry *p; 903 int depth; 904 int i, n; 905 906 switch (fmt[1]) { 907 case '2': case '3': case '4': 908 depth = fmt[1] - '0'; 909 break; 910 default: 911 depth = 1; 912 } 913 914 rcu_read_lock(); 915 for (i = 0; i < depth; i++, d = p) { 916 if (check_pointer(&buf, end, d, spec)) { 917 rcu_read_unlock(); 918 return buf; 919 } 920 921 p = READ_ONCE(d->d_parent); 922 array[i] = READ_ONCE(d->d_name.name); 923 if (p == d) { 924 if (i) 925 array[i] = ""; 926 i++; 927 break; 928 } 929 } 930 s = array[--i]; 931 for (n = 0; n != spec.precision; n++, buf++) { 932 char c = *s++; 933 if (!c) { 934 if (!i) 935 break; 936 c = '/'; 937 s = array[--i]; 938 } 939 if (buf < end) 940 *buf = c; 941 } 942 rcu_read_unlock(); 943 return widen_string(buf, n, end, spec); 944 } 945 946 static noinline_for_stack 947 char *file_dentry_name(char *buf, char *end, const struct file *f, 948 struct printf_spec spec, const char *fmt) 949 { 950 if (check_pointer(&buf, end, f, spec)) 951 return buf; 952 953 return dentry_name(buf, end, f->f_path.dentry, spec, fmt); 954 } 955 #ifdef CONFIG_BLOCK 956 static noinline_for_stack 957 char *bdev_name(char *buf, char *end, struct block_device *bdev, 958 struct printf_spec spec, const char *fmt) 959 { 960 struct gendisk *hd; 961 962 if (check_pointer(&buf, end, bdev, spec)) 963 return buf; 964 965 hd = bdev->bd_disk; 966 buf = string(buf, end, hd->disk_name, spec); 967 if (bdev->bd_partno) { 968 if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) { 969 if (buf < end) 970 *buf = 'p'; 971 buf++; 972 } 973 buf = number(buf, end, bdev->bd_partno, spec); 974 } 975 return buf; 976 } 977 #endif 978 979 static noinline_for_stack 980 char *symbol_string(char *buf, char *end, void *ptr, 981 struct printf_spec spec, const char *fmt) 982 { 983 unsigned long value; 984 #ifdef CONFIG_KALLSYMS 985 char sym[KSYM_SYMBOL_LEN]; 986 #endif 987 988 if (fmt[1] == 'R') 989 ptr = __builtin_extract_return_addr(ptr); 990 value = (unsigned long)ptr; 991 992 #ifdef CONFIG_KALLSYMS 993 if (*fmt == 'B' && fmt[1] == 'b') 994 sprint_backtrace_build_id(sym, value); 995 else if (*fmt == 'B') 996 sprint_backtrace(sym, value); 997 else if (*fmt == 'S' && (fmt[1] == 'b' || (fmt[1] == 'R' && fmt[2] == 'b'))) 998 sprint_symbol_build_id(sym, value); 999 else if (*fmt != 's') 1000 sprint_symbol(sym, value); 1001 else 1002 sprint_symbol_no_offset(sym, value); 1003 1004 return string_nocheck(buf, end, sym, spec); 1005 #else 1006 return special_hex_number(buf, end, value, sizeof(void *)); 1007 #endif 1008 } 1009 1010 static const struct printf_spec default_str_spec = { 1011 .field_width = -1, 1012 .precision = -1, 1013 }; 1014 1015 static const struct printf_spec default_flag_spec = { 1016 .base = 16, 1017 .precision = -1, 1018 .flags = SPECIAL | SMALL, 1019 }; 1020 1021 static const struct printf_spec default_dec_spec = { 1022 .base = 10, 1023 .precision = -1, 1024 }; 1025 1026 static const struct printf_spec default_dec02_spec = { 1027 .base = 10, 1028 .field_width = 2, 1029 .precision = -1, 1030 .flags = ZEROPAD, 1031 }; 1032 1033 static const struct printf_spec default_dec04_spec = { 1034 .base = 10, 1035 .field_width = 4, 1036 .precision = -1, 1037 .flags = ZEROPAD, 1038 }; 1039 1040 static noinline_for_stack 1041 char *resource_string(char *buf, char *end, struct resource *res, 1042 struct printf_spec spec, const char *fmt) 1043 { 1044 #ifndef IO_RSRC_PRINTK_SIZE 1045 #define IO_RSRC_PRINTK_SIZE 6 1046 #endif 1047 1048 #ifndef MEM_RSRC_PRINTK_SIZE 1049 #define MEM_RSRC_PRINTK_SIZE 10 1050 #endif 1051 static const struct printf_spec io_spec = { 1052 .base = 16, 1053 .field_width = IO_RSRC_PRINTK_SIZE, 1054 .precision = -1, 1055 .flags = SPECIAL | SMALL | ZEROPAD, 1056 }; 1057 static const struct printf_spec mem_spec = { 1058 .base = 16, 1059 .field_width = MEM_RSRC_PRINTK_SIZE, 1060 .precision = -1, 1061 .flags = SPECIAL | SMALL | ZEROPAD, 1062 }; 1063 static const struct printf_spec bus_spec = { 1064 .base = 16, 1065 .field_width = 2, 1066 .precision = -1, 1067 .flags = SMALL | ZEROPAD, 1068 }; 1069 static const struct printf_spec str_spec = { 1070 .field_width = -1, 1071 .precision = 10, 1072 .flags = LEFT, 1073 }; 1074 1075 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) 1076 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ 1077 #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) 1078 #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) 1079 #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") 1080 #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") 1081 char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, 1082 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; 1083 1084 char *p = sym, *pend = sym + sizeof(sym); 1085 int decode = (fmt[0] == 'R') ? 1 : 0; 1086 const struct printf_spec *specp; 1087 1088 if (check_pointer(&buf, end, res, spec)) 1089 return buf; 1090 1091 *p++ = '['; 1092 if (res->flags & IORESOURCE_IO) { 1093 p = string_nocheck(p, pend, "io ", str_spec); 1094 specp = &io_spec; 1095 } else if (res->flags & IORESOURCE_MEM) { 1096 p = string_nocheck(p, pend, "mem ", str_spec); 1097 specp = &mem_spec; 1098 } else if (res->flags & IORESOURCE_IRQ) { 1099 p = string_nocheck(p, pend, "irq ", str_spec); 1100 specp = &default_dec_spec; 1101 } else if (res->flags & IORESOURCE_DMA) { 1102 p = string_nocheck(p, pend, "dma ", str_spec); 1103 specp = &default_dec_spec; 1104 } else if (res->flags & IORESOURCE_BUS) { 1105 p = string_nocheck(p, pend, "bus ", str_spec); 1106 specp = &bus_spec; 1107 } else { 1108 p = string_nocheck(p, pend, "??? ", str_spec); 1109 specp = &mem_spec; 1110 decode = 0; 1111 } 1112 if (decode && res->flags & IORESOURCE_UNSET) { 1113 p = string_nocheck(p, pend, "size ", str_spec); 1114 p = number(p, pend, resource_size(res), *specp); 1115 } else { 1116 p = number(p, pend, res->start, *specp); 1117 if (res->start != res->end) { 1118 *p++ = '-'; 1119 p = number(p, pend, res->end, *specp); 1120 } 1121 } 1122 if (decode) { 1123 if (res->flags & IORESOURCE_MEM_64) 1124 p = string_nocheck(p, pend, " 64bit", str_spec); 1125 if (res->flags & IORESOURCE_PREFETCH) 1126 p = string_nocheck(p, pend, " pref", str_spec); 1127 if (res->flags & IORESOURCE_WINDOW) 1128 p = string_nocheck(p, pend, " window", str_spec); 1129 if (res->flags & IORESOURCE_DISABLED) 1130 p = string_nocheck(p, pend, " disabled", str_spec); 1131 } else { 1132 p = string_nocheck(p, pend, " flags ", str_spec); 1133 p = number(p, pend, res->flags, default_flag_spec); 1134 } 1135 *p++ = ']'; 1136 *p = '\0'; 1137 1138 return string_nocheck(buf, end, sym, spec); 1139 } 1140 1141 static noinline_for_stack 1142 char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec, 1143 const char *fmt) 1144 { 1145 int i, len = 1; /* if we pass '%ph[CDN]', field width remains 1146 negative value, fallback to the default */ 1147 char separator; 1148 1149 if (spec.field_width == 0) 1150 /* nothing to print */ 1151 return buf; 1152 1153 if (check_pointer(&buf, end, addr, spec)) 1154 return buf; 1155 1156 switch (fmt[1]) { 1157 case 'C': 1158 separator = ':'; 1159 break; 1160 case 'D': 1161 separator = '-'; 1162 break; 1163 case 'N': 1164 separator = 0; 1165 break; 1166 default: 1167 separator = ' '; 1168 break; 1169 } 1170 1171 if (spec.field_width > 0) 1172 len = min_t(int, spec.field_width, 64); 1173 1174 for (i = 0; i < len; ++i) { 1175 if (buf < end) 1176 *buf = hex_asc_hi(addr[i]); 1177 ++buf; 1178 if (buf < end) 1179 *buf = hex_asc_lo(addr[i]); 1180 ++buf; 1181 1182 if (separator && i != len - 1) { 1183 if (buf < end) 1184 *buf = separator; 1185 ++buf; 1186 } 1187 } 1188 1189 return buf; 1190 } 1191 1192 static noinline_for_stack 1193 char *bitmap_string(char *buf, char *end, const unsigned long *bitmap, 1194 struct printf_spec spec, const char *fmt) 1195 { 1196 const int CHUNKSZ = 32; 1197 int nr_bits = max_t(int, spec.field_width, 0); 1198 int i, chunksz; 1199 bool first = true; 1200 1201 if (check_pointer(&buf, end, bitmap, spec)) 1202 return buf; 1203 1204 /* reused to print numbers */ 1205 spec = (struct printf_spec){ .flags = SMALL | ZEROPAD, .base = 16 }; 1206 1207 chunksz = nr_bits & (CHUNKSZ - 1); 1208 if (chunksz == 0) 1209 chunksz = CHUNKSZ; 1210 1211 i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ; 1212 for (; i >= 0; i -= CHUNKSZ) { 1213 u32 chunkmask, val; 1214 int word, bit; 1215 1216 chunkmask = ((1ULL << chunksz) - 1); 1217 word = i / BITS_PER_LONG; 1218 bit = i % BITS_PER_LONG; 1219 val = (bitmap[word] >> bit) & chunkmask; 1220 1221 if (!first) { 1222 if (buf < end) 1223 *buf = ','; 1224 buf++; 1225 } 1226 first = false; 1227 1228 spec.field_width = DIV_ROUND_UP(chunksz, 4); 1229 buf = number(buf, end, val, spec); 1230 1231 chunksz = CHUNKSZ; 1232 } 1233 return buf; 1234 } 1235 1236 static noinline_for_stack 1237 char *bitmap_list_string(char *buf, char *end, const unsigned long *bitmap, 1238 struct printf_spec spec, const char *fmt) 1239 { 1240 int nr_bits = max_t(int, spec.field_width, 0); 1241 bool first = true; 1242 int rbot, rtop; 1243 1244 if (check_pointer(&buf, end, bitmap, spec)) 1245 return buf; 1246 1247 for_each_set_bitrange(rbot, rtop, bitmap, nr_bits) { 1248 if (!first) { 1249 if (buf < end) 1250 *buf = ','; 1251 buf++; 1252 } 1253 first = false; 1254 1255 buf = number(buf, end, rbot, default_dec_spec); 1256 if (rtop == rbot + 1) 1257 continue; 1258 1259 if (buf < end) 1260 *buf = '-'; 1261 buf = number(++buf, end, rtop - 1, default_dec_spec); 1262 } 1263 return buf; 1264 } 1265 1266 static noinline_for_stack 1267 char *mac_address_string(char *buf, char *end, u8 *addr, 1268 struct printf_spec spec, const char *fmt) 1269 { 1270 char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; 1271 char *p = mac_addr; 1272 int i; 1273 char separator; 1274 bool reversed = false; 1275 1276 if (check_pointer(&buf, end, addr, spec)) 1277 return buf; 1278 1279 switch (fmt[1]) { 1280 case 'F': 1281 separator = '-'; 1282 break; 1283 1284 case 'R': 1285 reversed = true; 1286 fallthrough; 1287 1288 default: 1289 separator = ':'; 1290 break; 1291 } 1292 1293 for (i = 0; i < 6; i++) { 1294 if (reversed) 1295 p = hex_byte_pack(p, addr[5 - i]); 1296 else 1297 p = hex_byte_pack(p, addr[i]); 1298 1299 if (fmt[0] == 'M' && i != 5) 1300 *p++ = separator; 1301 } 1302 *p = '\0'; 1303 1304 return string_nocheck(buf, end, mac_addr, spec); 1305 } 1306 1307 static noinline_for_stack 1308 char *ip4_string(char *p, const u8 *addr, const char *fmt) 1309 { 1310 int i; 1311 bool leading_zeros = (fmt[0] == 'i'); 1312 int index; 1313 int step; 1314 1315 switch (fmt[2]) { 1316 case 'h': 1317 #ifdef __BIG_ENDIAN 1318 index = 0; 1319 step = 1; 1320 #else 1321 index = 3; 1322 step = -1; 1323 #endif 1324 break; 1325 case 'l': 1326 index = 3; 1327 step = -1; 1328 break; 1329 case 'n': 1330 case 'b': 1331 default: 1332 index = 0; 1333 step = 1; 1334 break; 1335 } 1336 for (i = 0; i < 4; i++) { 1337 char temp[4] __aligned(2); /* hold each IP quad in reverse order */ 1338 int digits = put_dec_trunc8(temp, addr[index]) - temp; 1339 if (leading_zeros) { 1340 if (digits < 3) 1341 *p++ = '0'; 1342 if (digits < 2) 1343 *p++ = '0'; 1344 } 1345 /* reverse the digits in the quad */ 1346 while (digits--) 1347 *p++ = temp[digits]; 1348 if (i < 3) 1349 *p++ = '.'; 1350 index += step; 1351 } 1352 *p = '\0'; 1353 1354 return p; 1355 } 1356 1357 static noinline_for_stack 1358 char *ip6_compressed_string(char *p, const char *addr) 1359 { 1360 int i, j, range; 1361 unsigned char zerolength[8]; 1362 int longest = 1; 1363 int colonpos = -1; 1364 u16 word; 1365 u8 hi, lo; 1366 bool needcolon = false; 1367 bool useIPv4; 1368 struct in6_addr in6; 1369 1370 memcpy(&in6, addr, sizeof(struct in6_addr)); 1371 1372 useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); 1373 1374 memset(zerolength, 0, sizeof(zerolength)); 1375 1376 if (useIPv4) 1377 range = 6; 1378 else 1379 range = 8; 1380 1381 /* find position of longest 0 run */ 1382 for (i = 0; i < range; i++) { 1383 for (j = i; j < range; j++) { 1384 if (in6.s6_addr16[j] != 0) 1385 break; 1386 zerolength[i]++; 1387 } 1388 } 1389 for (i = 0; i < range; i++) { 1390 if (zerolength[i] > longest) { 1391 longest = zerolength[i]; 1392 colonpos = i; 1393 } 1394 } 1395 if (longest == 1) /* don't compress a single 0 */ 1396 colonpos = -1; 1397 1398 /* emit address */ 1399 for (i = 0; i < range; i++) { 1400 if (i == colonpos) { 1401 if (needcolon || i == 0) 1402 *p++ = ':'; 1403 *p++ = ':'; 1404 needcolon = false; 1405 i += longest - 1; 1406 continue; 1407 } 1408 if (needcolon) { 1409 *p++ = ':'; 1410 needcolon = false; 1411 } 1412 /* hex u16 without leading 0s */ 1413 word = ntohs(in6.s6_addr16[i]); 1414 hi = word >> 8; 1415 lo = word & 0xff; 1416 if (hi) { 1417 if (hi > 0x0f) 1418 p = hex_byte_pack(p, hi); 1419 else 1420 *p++ = hex_asc_lo(hi); 1421 p = hex_byte_pack(p, lo); 1422 } 1423 else if (lo > 0x0f) 1424 p = hex_byte_pack(p, lo); 1425 else 1426 *p++ = hex_asc_lo(lo); 1427 needcolon = true; 1428 } 1429 1430 if (useIPv4) { 1431 if (needcolon) 1432 *p++ = ':'; 1433 p = ip4_string(p, &in6.s6_addr[12], "I4"); 1434 } 1435 *p = '\0'; 1436 1437 return p; 1438 } 1439 1440 static noinline_for_stack 1441 char *ip6_string(char *p, const char *addr, const char *fmt) 1442 { 1443 int i; 1444 1445 for (i = 0; i < 8; i++) { 1446 p = hex_byte_pack(p, *addr++); 1447 p = hex_byte_pack(p, *addr++); 1448 if (fmt[0] == 'I' && i != 7) 1449 *p++ = ':'; 1450 } 1451 *p = '\0'; 1452 1453 return p; 1454 } 1455 1456 static noinline_for_stack 1457 char *ip6_addr_string(char *buf, char *end, const u8 *addr, 1458 struct printf_spec spec, const char *fmt) 1459 { 1460 char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; 1461 1462 if (fmt[0] == 'I' && fmt[2] == 'c') 1463 ip6_compressed_string(ip6_addr, addr); 1464 else 1465 ip6_string(ip6_addr, addr, fmt); 1466 1467 return string_nocheck(buf, end, ip6_addr, spec); 1468 } 1469 1470 static noinline_for_stack 1471 char *ip4_addr_string(char *buf, char *end, const u8 *addr, 1472 struct printf_spec spec, const char *fmt) 1473 { 1474 char ip4_addr[sizeof("255.255.255.255")]; 1475 1476 ip4_string(ip4_addr, addr, fmt); 1477 1478 return string_nocheck(buf, end, ip4_addr, spec); 1479 } 1480 1481 static noinline_for_stack 1482 char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa, 1483 struct printf_spec spec, const char *fmt) 1484 { 1485 bool have_p = false, have_s = false, have_f = false, have_c = false; 1486 char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") + 1487 sizeof(":12345") + sizeof("/123456789") + 1488 sizeof("%1234567890")]; 1489 char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr); 1490 const u8 *addr = (const u8 *) &sa->sin6_addr; 1491 char fmt6[2] = { fmt[0], '6' }; 1492 u8 off = 0; 1493 1494 fmt++; 1495 while (isalpha(*++fmt)) { 1496 switch (*fmt) { 1497 case 'p': 1498 have_p = true; 1499 break; 1500 case 'f': 1501 have_f = true; 1502 break; 1503 case 's': 1504 have_s = true; 1505 break; 1506 case 'c': 1507 have_c = true; 1508 break; 1509 } 1510 } 1511 1512 if (have_p || have_s || have_f) { 1513 *p = '['; 1514 off = 1; 1515 } 1516 1517 if (fmt6[0] == 'I' && have_c) 1518 p = ip6_compressed_string(ip6_addr + off, addr); 1519 else 1520 p = ip6_string(ip6_addr + off, addr, fmt6); 1521 1522 if (have_p || have_s || have_f) 1523 *p++ = ']'; 1524 1525 if (have_p) { 1526 *p++ = ':'; 1527 p = number(p, pend, ntohs(sa->sin6_port), spec); 1528 } 1529 if (have_f) { 1530 *p++ = '/'; 1531 p = number(p, pend, ntohl(sa->sin6_flowinfo & 1532 IPV6_FLOWINFO_MASK), spec); 1533 } 1534 if (have_s) { 1535 *p++ = '%'; 1536 p = number(p, pend, sa->sin6_scope_id, spec); 1537 } 1538 *p = '\0'; 1539 1540 return string_nocheck(buf, end, ip6_addr, spec); 1541 } 1542 1543 static noinline_for_stack 1544 char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa, 1545 struct printf_spec spec, const char *fmt) 1546 { 1547 bool have_p = false; 1548 char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")]; 1549 char *pend = ip4_addr + sizeof(ip4_addr); 1550 const u8 *addr = (const u8 *) &sa->sin_addr.s_addr; 1551 char fmt4[3] = { fmt[0], '4', 0 }; 1552 1553 fmt++; 1554 while (isalpha(*++fmt)) { 1555 switch (*fmt) { 1556 case 'p': 1557 have_p = true; 1558 break; 1559 case 'h': 1560 case 'l': 1561 case 'n': 1562 case 'b': 1563 fmt4[2] = *fmt; 1564 break; 1565 } 1566 } 1567 1568 p = ip4_string(ip4_addr, addr, fmt4); 1569 if (have_p) { 1570 *p++ = ':'; 1571 p = number(p, pend, ntohs(sa->sin_port), spec); 1572 } 1573 *p = '\0'; 1574 1575 return string_nocheck(buf, end, ip4_addr, spec); 1576 } 1577 1578 static noinline_for_stack 1579 char *ip_addr_string(char *buf, char *end, const void *ptr, 1580 struct printf_spec spec, const char *fmt) 1581 { 1582 char *err_fmt_msg; 1583 1584 if (check_pointer(&buf, end, ptr, spec)) 1585 return buf; 1586 1587 switch (fmt[1]) { 1588 case '6': 1589 return ip6_addr_string(buf, end, ptr, spec, fmt); 1590 case '4': 1591 return ip4_addr_string(buf, end, ptr, spec, fmt); 1592 case 'S': { 1593 const union { 1594 struct sockaddr raw; 1595 struct sockaddr_in v4; 1596 struct sockaddr_in6 v6; 1597 } *sa = ptr; 1598 1599 switch (sa->raw.sa_family) { 1600 case AF_INET: 1601 return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt); 1602 case AF_INET6: 1603 return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt); 1604 default: 1605 return error_string(buf, end, "(einval)", spec); 1606 }} 1607 } 1608 1609 err_fmt_msg = fmt[0] == 'i' ? "(%pi?)" : "(%pI?)"; 1610 return error_string(buf, end, err_fmt_msg, spec); 1611 } 1612 1613 static noinline_for_stack 1614 char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec, 1615 const char *fmt) 1616 { 1617 bool found = true; 1618 int count = 1; 1619 unsigned int flags = 0; 1620 int len; 1621 1622 if (spec.field_width == 0) 1623 return buf; /* nothing to print */ 1624 1625 if (check_pointer(&buf, end, addr, spec)) 1626 return buf; 1627 1628 do { 1629 switch (fmt[count++]) { 1630 case 'a': 1631 flags |= ESCAPE_ANY; 1632 break; 1633 case 'c': 1634 flags |= ESCAPE_SPECIAL; 1635 break; 1636 case 'h': 1637 flags |= ESCAPE_HEX; 1638 break; 1639 case 'n': 1640 flags |= ESCAPE_NULL; 1641 break; 1642 case 'o': 1643 flags |= ESCAPE_OCTAL; 1644 break; 1645 case 'p': 1646 flags |= ESCAPE_NP; 1647 break; 1648 case 's': 1649 flags |= ESCAPE_SPACE; 1650 break; 1651 default: 1652 found = false; 1653 break; 1654 } 1655 } while (found); 1656 1657 if (!flags) 1658 flags = ESCAPE_ANY_NP; 1659 1660 len = spec.field_width < 0 ? 1 : spec.field_width; 1661 1662 /* 1663 * string_escape_mem() writes as many characters as it can to 1664 * the given buffer, and returns the total size of the output 1665 * had the buffer been big enough. 1666 */ 1667 buf += string_escape_mem(addr, len, buf, buf < end ? end - buf : 0, flags, NULL); 1668 1669 return buf; 1670 } 1671 1672 static char *va_format(char *buf, char *end, struct va_format *va_fmt, 1673 struct printf_spec spec, const char *fmt) 1674 { 1675 va_list va; 1676 1677 if (check_pointer(&buf, end, va_fmt, spec)) 1678 return buf; 1679 1680 va_copy(va, *va_fmt->va); 1681 buf += vsnprintf(buf, end > buf ? end - buf : 0, va_fmt->fmt, va); 1682 va_end(va); 1683 1684 return buf; 1685 } 1686 1687 static noinline_for_stack 1688 char *uuid_string(char *buf, char *end, const u8 *addr, 1689 struct printf_spec spec, const char *fmt) 1690 { 1691 char uuid[UUID_STRING_LEN + 1]; 1692 char *p = uuid; 1693 int i; 1694 const u8 *index = uuid_index; 1695 bool uc = false; 1696 1697 if (check_pointer(&buf, end, addr, spec)) 1698 return buf; 1699 1700 switch (*(++fmt)) { 1701 case 'L': 1702 uc = true; 1703 fallthrough; 1704 case 'l': 1705 index = guid_index; 1706 break; 1707 case 'B': 1708 uc = true; 1709 break; 1710 } 1711 1712 for (i = 0; i < 16; i++) { 1713 if (uc) 1714 p = hex_byte_pack_upper(p, addr[index[i]]); 1715 else 1716 p = hex_byte_pack(p, addr[index[i]]); 1717 switch (i) { 1718 case 3: 1719 case 5: 1720 case 7: 1721 case 9: 1722 *p++ = '-'; 1723 break; 1724 } 1725 } 1726 1727 *p = 0; 1728 1729 return string_nocheck(buf, end, uuid, spec); 1730 } 1731 1732 static noinline_for_stack 1733 char *netdev_bits(char *buf, char *end, const void *addr, 1734 struct printf_spec spec, const char *fmt) 1735 { 1736 unsigned long long num; 1737 int size; 1738 1739 if (check_pointer(&buf, end, addr, spec)) 1740 return buf; 1741 1742 switch (fmt[1]) { 1743 case 'F': 1744 num = *(const netdev_features_t *)addr; 1745 size = sizeof(netdev_features_t); 1746 break; 1747 default: 1748 return error_string(buf, end, "(%pN?)", spec); 1749 } 1750 1751 return special_hex_number(buf, end, num, size); 1752 } 1753 1754 static noinline_for_stack 1755 char *fourcc_string(char *buf, char *end, const u32 *fourcc, 1756 struct printf_spec spec, const char *fmt) 1757 { 1758 char output[sizeof("0123 little-endian (0x01234567)")]; 1759 char *p = output; 1760 unsigned int i; 1761 u32 orig, val; 1762 1763 if (fmt[1] != 'c' || fmt[2] != 'c') 1764 return error_string(buf, end, "(%p4?)", spec); 1765 1766 if (check_pointer(&buf, end, fourcc, spec)) 1767 return buf; 1768 1769 orig = get_unaligned(fourcc); 1770 val = orig & ~BIT(31); 1771 1772 for (i = 0; i < sizeof(u32); i++) { 1773 unsigned char c = val >> (i * 8); 1774 1775 /* Print non-control ASCII characters as-is, dot otherwise */ 1776 *p++ = isascii(c) && isprint(c) ? c : '.'; 1777 } 1778 1779 *p++ = ' '; 1780 strcpy(p, orig & BIT(31) ? "big-endian" : "little-endian"); 1781 p += strlen(p); 1782 1783 *p++ = ' '; 1784 *p++ = '('; 1785 p = special_hex_number(p, output + sizeof(output) - 2, orig, sizeof(u32)); 1786 *p++ = ')'; 1787 *p = '\0'; 1788 1789 return string(buf, end, output, spec); 1790 } 1791 1792 static noinline_for_stack 1793 char *address_val(char *buf, char *end, const void *addr, 1794 struct printf_spec spec, const char *fmt) 1795 { 1796 unsigned long long num; 1797 int size; 1798 1799 if (check_pointer(&buf, end, addr, spec)) 1800 return buf; 1801 1802 switch (fmt[1]) { 1803 case 'd': 1804 num = *(const dma_addr_t *)addr; 1805 size = sizeof(dma_addr_t); 1806 break; 1807 case 'p': 1808 default: 1809 num = *(const phys_addr_t *)addr; 1810 size = sizeof(phys_addr_t); 1811 break; 1812 } 1813 1814 return special_hex_number(buf, end, num, size); 1815 } 1816 1817 static noinline_for_stack 1818 char *date_str(char *buf, char *end, const struct rtc_time *tm, bool r) 1819 { 1820 int year = tm->tm_year + (r ? 0 : 1900); 1821 int mon = tm->tm_mon + (r ? 0 : 1); 1822 1823 buf = number(buf, end, year, default_dec04_spec); 1824 if (buf < end) 1825 *buf = '-'; 1826 buf++; 1827 1828 buf = number(buf, end, mon, default_dec02_spec); 1829 if (buf < end) 1830 *buf = '-'; 1831 buf++; 1832 1833 return number(buf, end, tm->tm_mday, default_dec02_spec); 1834 } 1835 1836 static noinline_for_stack 1837 char *time_str(char *buf, char *end, const struct rtc_time *tm, bool r) 1838 { 1839 buf = number(buf, end, tm->tm_hour, default_dec02_spec); 1840 if (buf < end) 1841 *buf = ':'; 1842 buf++; 1843 1844 buf = number(buf, end, tm->tm_min, default_dec02_spec); 1845 if (buf < end) 1846 *buf = ':'; 1847 buf++; 1848 1849 return number(buf, end, tm->tm_sec, default_dec02_spec); 1850 } 1851 1852 static noinline_for_stack 1853 char *rtc_str(char *buf, char *end, const struct rtc_time *tm, 1854 struct printf_spec spec, const char *fmt) 1855 { 1856 bool have_t = true, have_d = true; 1857 bool raw = false, iso8601_separator = true; 1858 bool found = true; 1859 int count = 2; 1860 1861 if (check_pointer(&buf, end, tm, spec)) 1862 return buf; 1863 1864 switch (fmt[count]) { 1865 case 'd': 1866 have_t = false; 1867 count++; 1868 break; 1869 case 't': 1870 have_d = false; 1871 count++; 1872 break; 1873 } 1874 1875 do { 1876 switch (fmt[count++]) { 1877 case 'r': 1878 raw = true; 1879 break; 1880 case 's': 1881 iso8601_separator = false; 1882 break; 1883 default: 1884 found = false; 1885 break; 1886 } 1887 } while (found); 1888 1889 if (have_d) 1890 buf = date_str(buf, end, tm, raw); 1891 if (have_d && have_t) { 1892 if (buf < end) 1893 *buf = iso8601_separator ? 'T' : ' '; 1894 buf++; 1895 } 1896 if (have_t) 1897 buf = time_str(buf, end, tm, raw); 1898 1899 return buf; 1900 } 1901 1902 static noinline_for_stack 1903 char *time64_str(char *buf, char *end, const time64_t time, 1904 struct printf_spec spec, const char *fmt) 1905 { 1906 struct rtc_time rtc_time; 1907 struct tm tm; 1908 1909 time64_to_tm(time, 0, &tm); 1910 1911 rtc_time.tm_sec = tm.tm_sec; 1912 rtc_time.tm_min = tm.tm_min; 1913 rtc_time.tm_hour = tm.tm_hour; 1914 rtc_time.tm_mday = tm.tm_mday; 1915 rtc_time.tm_mon = tm.tm_mon; 1916 rtc_time.tm_year = tm.tm_year; 1917 rtc_time.tm_wday = tm.tm_wday; 1918 rtc_time.tm_yday = tm.tm_yday; 1919 1920 rtc_time.tm_isdst = 0; 1921 1922 return rtc_str(buf, end, &rtc_time, spec, fmt); 1923 } 1924 1925 static noinline_for_stack 1926 char *time_and_date(char *buf, char *end, void *ptr, struct printf_spec spec, 1927 const char *fmt) 1928 { 1929 switch (fmt[1]) { 1930 case 'R': 1931 return rtc_str(buf, end, (const struct rtc_time *)ptr, spec, fmt); 1932 case 'T': 1933 return time64_str(buf, end, *(const time64_t *)ptr, spec, fmt); 1934 default: 1935 return error_string(buf, end, "(%pt?)", spec); 1936 } 1937 } 1938 1939 static noinline_for_stack 1940 char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec, 1941 const char *fmt) 1942 { 1943 if (!IS_ENABLED(CONFIG_HAVE_CLK)) 1944 return error_string(buf, end, "(%pC?)", spec); 1945 1946 if (check_pointer(&buf, end, clk, spec)) 1947 return buf; 1948 1949 switch (fmt[1]) { 1950 case 'n': 1951 default: 1952 #ifdef CONFIG_COMMON_CLK 1953 return string(buf, end, __clk_get_name(clk), spec); 1954 #else 1955 return ptr_to_id(buf, end, clk, spec); 1956 #endif 1957 } 1958 } 1959 1960 static 1961 char *format_flags(char *buf, char *end, unsigned long flags, 1962 const struct trace_print_flags *names) 1963 { 1964 unsigned long mask; 1965 1966 for ( ; flags && names->name; names++) { 1967 mask = names->mask; 1968 if ((flags & mask) != mask) 1969 continue; 1970 1971 buf = string(buf, end, names->name, default_str_spec); 1972 1973 flags &= ~mask; 1974 if (flags) { 1975 if (buf < end) 1976 *buf = '|'; 1977 buf++; 1978 } 1979 } 1980 1981 if (flags) 1982 buf = number(buf, end, flags, default_flag_spec); 1983 1984 return buf; 1985 } 1986 1987 struct page_flags_fields { 1988 int width; 1989 int shift; 1990 int mask; 1991 const struct printf_spec *spec; 1992 const char *name; 1993 }; 1994 1995 static const struct page_flags_fields pff[] = { 1996 {SECTIONS_WIDTH, SECTIONS_PGSHIFT, SECTIONS_MASK, 1997 &default_dec_spec, "section"}, 1998 {NODES_WIDTH, NODES_PGSHIFT, NODES_MASK, 1999 &default_dec_spec, "node"}, 2000 {ZONES_WIDTH, ZONES_PGSHIFT, ZONES_MASK, 2001 &default_dec_spec, "zone"}, 2002 {LAST_CPUPID_WIDTH, LAST_CPUPID_PGSHIFT, LAST_CPUPID_MASK, 2003 &default_flag_spec, "lastcpupid"}, 2004 {KASAN_TAG_WIDTH, KASAN_TAG_PGSHIFT, KASAN_TAG_MASK, 2005 &default_flag_spec, "kasantag"}, 2006 }; 2007 2008 static 2009 char *format_page_flags(char *buf, char *end, unsigned long flags) 2010 { 2011 unsigned long main_flags = flags & PAGEFLAGS_MASK; 2012 bool append = false; 2013 int i; 2014 2015 buf = number(buf, end, flags, default_flag_spec); 2016 if (buf < end) 2017 *buf = '('; 2018 buf++; 2019 2020 /* Page flags from the main area. */ 2021 if (main_flags) { 2022 buf = format_flags(buf, end, main_flags, pageflag_names); 2023 append = true; 2024 } 2025 2026 /* Page flags from the fields area */ 2027 for (i = 0; i < ARRAY_SIZE(pff); i++) { 2028 /* Skip undefined fields. */ 2029 if (!pff[i].width) 2030 continue; 2031 2032 /* Format: Flag Name + '=' (equals sign) + Number + '|' (separator) */ 2033 if (append) { 2034 if (buf < end) 2035 *buf = '|'; 2036 buf++; 2037 } 2038 2039 buf = string(buf, end, pff[i].name, default_str_spec); 2040 if (buf < end) 2041 *buf = '='; 2042 buf++; 2043 buf = number(buf, end, (flags >> pff[i].shift) & pff[i].mask, 2044 *pff[i].spec); 2045 2046 append = true; 2047 } 2048 if (buf < end) 2049 *buf = ')'; 2050 buf++; 2051 2052 return buf; 2053 } 2054 2055 static 2056 char *format_page_type(char *buf, char *end, unsigned int page_type) 2057 { 2058 buf = number(buf, end, page_type, default_flag_spec); 2059 2060 if (buf < end) 2061 *buf = '('; 2062 buf++; 2063 2064 if (page_type_has_type(page_type)) 2065 buf = format_flags(buf, end, ~page_type, pagetype_names); 2066 2067 if (buf < end) 2068 *buf = ')'; 2069 buf++; 2070 2071 return buf; 2072 } 2073 2074 static noinline_for_stack 2075 char *flags_string(char *buf, char *end, void *flags_ptr, 2076 struct printf_spec spec, const char *fmt) 2077 { 2078 unsigned long flags; 2079 const struct trace_print_flags *names; 2080 2081 if (check_pointer(&buf, end, flags_ptr, spec)) 2082 return buf; 2083 2084 switch (fmt[1]) { 2085 case 'p': 2086 return format_page_flags(buf, end, *(unsigned long *)flags_ptr); 2087 case 't': 2088 return format_page_type(buf, end, *(unsigned int *)flags_ptr); 2089 case 'v': 2090 flags = *(unsigned long *)flags_ptr; 2091 names = vmaflag_names; 2092 break; 2093 case 'g': 2094 flags = (__force unsigned long)(*(gfp_t *)flags_ptr); 2095 names = gfpflag_names; 2096 break; 2097 default: 2098 return error_string(buf, end, "(%pG?)", spec); 2099 } 2100 2101 return format_flags(buf, end, flags, names); 2102 } 2103 2104 static noinline_for_stack 2105 char *fwnode_full_name_string(struct fwnode_handle *fwnode, char *buf, 2106 char *end) 2107 { 2108 int depth; 2109 2110 /* Loop starting from the root node to the current node. */ 2111 for (depth = fwnode_count_parents(fwnode); depth >= 0; depth--) { 2112 struct fwnode_handle *__fwnode = 2113 fwnode_get_nth_parent(fwnode, depth); 2114 2115 buf = string(buf, end, fwnode_get_name_prefix(__fwnode), 2116 default_str_spec); 2117 buf = string(buf, end, fwnode_get_name(__fwnode), 2118 default_str_spec); 2119 2120 fwnode_handle_put(__fwnode); 2121 } 2122 2123 return buf; 2124 } 2125 2126 static noinline_for_stack 2127 char *device_node_string(char *buf, char *end, struct device_node *dn, 2128 struct printf_spec spec, const char *fmt) 2129 { 2130 char tbuf[sizeof("xxxx") + 1]; 2131 const char *p; 2132 int ret; 2133 char *buf_start = buf; 2134 struct property *prop; 2135 bool has_mult, pass; 2136 2137 struct printf_spec str_spec = spec; 2138 str_spec.field_width = -1; 2139 2140 if (fmt[0] != 'F') 2141 return error_string(buf, end, "(%pO?)", spec); 2142 2143 if (!IS_ENABLED(CONFIG_OF)) 2144 return error_string(buf, end, "(%pOF?)", spec); 2145 2146 if (check_pointer(&buf, end, dn, spec)) 2147 return buf; 2148 2149 /* simple case without anything any more format specifiers */ 2150 fmt++; 2151 if (fmt[0] == '\0' || strcspn(fmt,"fnpPFcC") > 0) 2152 fmt = "f"; 2153 2154 for (pass = false; strspn(fmt,"fnpPFcC"); fmt++, pass = true) { 2155 int precision; 2156 if (pass) { 2157 if (buf < end) 2158 *buf = ':'; 2159 buf++; 2160 } 2161 2162 switch (*fmt) { 2163 case 'f': /* full_name */ 2164 buf = fwnode_full_name_string(of_fwnode_handle(dn), buf, 2165 end); 2166 break; 2167 case 'n': /* name */ 2168 p = fwnode_get_name(of_fwnode_handle(dn)); 2169 precision = str_spec.precision; 2170 str_spec.precision = strchrnul(p, '@') - p; 2171 buf = string(buf, end, p, str_spec); 2172 str_spec.precision = precision; 2173 break; 2174 case 'p': /* phandle */ 2175 buf = number(buf, end, (unsigned int)dn->phandle, default_dec_spec); 2176 break; 2177 case 'P': /* path-spec */ 2178 p = fwnode_get_name(of_fwnode_handle(dn)); 2179 if (!p[1]) 2180 p = "/"; 2181 buf = string(buf, end, p, str_spec); 2182 break; 2183 case 'F': /* flags */ 2184 tbuf[0] = of_node_check_flag(dn, OF_DYNAMIC) ? 'D' : '-'; 2185 tbuf[1] = of_node_check_flag(dn, OF_DETACHED) ? 'd' : '-'; 2186 tbuf[2] = of_node_check_flag(dn, OF_POPULATED) ? 'P' : '-'; 2187 tbuf[3] = of_node_check_flag(dn, OF_POPULATED_BUS) ? 'B' : '-'; 2188 tbuf[4] = 0; 2189 buf = string_nocheck(buf, end, tbuf, str_spec); 2190 break; 2191 case 'c': /* major compatible string */ 2192 ret = of_property_read_string(dn, "compatible", &p); 2193 if (!ret) 2194 buf = string(buf, end, p, str_spec); 2195 break; 2196 case 'C': /* full compatible string */ 2197 has_mult = false; 2198 of_property_for_each_string(dn, "compatible", prop, p) { 2199 if (has_mult) 2200 buf = string_nocheck(buf, end, ",", str_spec); 2201 buf = string_nocheck(buf, end, "\"", str_spec); 2202 buf = string(buf, end, p, str_spec); 2203 buf = string_nocheck(buf, end, "\"", str_spec); 2204 2205 has_mult = true; 2206 } 2207 break; 2208 default: 2209 break; 2210 } 2211 } 2212 2213 return widen_string(buf, buf - buf_start, end, spec); 2214 } 2215 2216 static noinline_for_stack 2217 char *fwnode_string(char *buf, char *end, struct fwnode_handle *fwnode, 2218 struct printf_spec spec, const char *fmt) 2219 { 2220 struct printf_spec str_spec = spec; 2221 char *buf_start = buf; 2222 2223 str_spec.field_width = -1; 2224 2225 if (*fmt != 'w') 2226 return error_string(buf, end, "(%pf?)", spec); 2227 2228 if (check_pointer(&buf, end, fwnode, spec)) 2229 return buf; 2230 2231 fmt++; 2232 2233 switch (*fmt) { 2234 case 'P': /* name */ 2235 buf = string(buf, end, fwnode_get_name(fwnode), str_spec); 2236 break; 2237 case 'f': /* full_name */ 2238 default: 2239 buf = fwnode_full_name_string(fwnode, buf, end); 2240 break; 2241 } 2242 2243 return widen_string(buf, buf - buf_start, end, spec); 2244 } 2245 2246 int __init no_hash_pointers_enable(char *str) 2247 { 2248 if (no_hash_pointers) 2249 return 0; 2250 2251 no_hash_pointers = true; 2252 2253 pr_warn("**********************************************************\n"); 2254 pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n"); 2255 pr_warn("** **\n"); 2256 pr_warn("** This system shows unhashed kernel memory addresses **\n"); 2257 pr_warn("** via the console, logs, and other interfaces. This **\n"); 2258 pr_warn("** might reduce the security of your system. **\n"); 2259 pr_warn("** **\n"); 2260 pr_warn("** If you see this message and you are not debugging **\n"); 2261 pr_warn("** the kernel, report this immediately to your system **\n"); 2262 pr_warn("** administrator! **\n"); 2263 pr_warn("** **\n"); 2264 pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n"); 2265 pr_warn("**********************************************************\n"); 2266 2267 return 0; 2268 } 2269 early_param("no_hash_pointers", no_hash_pointers_enable); 2270 2271 /* Used for Rust formatting ('%pA'). */ 2272 char *rust_fmt_argument(char *buf, char *end, void *ptr); 2273 2274 /* 2275 * Show a '%p' thing. A kernel extension is that the '%p' is followed 2276 * by an extra set of alphanumeric characters that are extended format 2277 * specifiers. 2278 * 2279 * Please update scripts/checkpatch.pl when adding/removing conversion 2280 * characters. (Search for "check for vsprintf extension"). 2281 * 2282 * Right now we handle: 2283 * 2284 * - 'S' For symbolic direct pointers (or function descriptors) with offset 2285 * - 's' For symbolic direct pointers (or function descriptors) without offset 2286 * - '[Ss]R' as above with __builtin_extract_return_addr() translation 2287 * - 'S[R]b' as above with module build ID (for use in backtraces) 2288 * - '[Ff]' %pf and %pF were obsoleted and later removed in favor of 2289 * %ps and %pS. Be careful when re-using these specifiers. 2290 * - 'B' For backtraced symbolic direct pointers with offset 2291 * - 'Bb' as above with module build ID (for use in backtraces) 2292 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] 2293 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] 2294 * - 'b[l]' For a bitmap, the number of bits is determined by the field 2295 * width which must be explicitly specified either as part of the 2296 * format string '%32b[l]' or through '%*b[l]', [l] selects 2297 * range-list format instead of hex format 2298 * - 'M' For a 6-byte MAC address, it prints the address in the 2299 * usual colon-separated hex notation 2300 * - 'm' For a 6-byte MAC address, it prints the hex address without colons 2301 * - 'MF' For a 6-byte MAC FDDI address, it prints the address 2302 * with a dash-separated hex notation 2303 * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth) 2304 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way 2305 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) 2306 * IPv6 uses colon separated network-order 16 bit hex with leading 0's 2307 * [S][pfs] 2308 * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to 2309 * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] 2310 * - 'i' [46] for 'raw' IPv4/IPv6 addresses 2311 * IPv6 omits the colons (01020304...0f) 2312 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) 2313 * [S][pfs] 2314 * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to 2315 * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] 2316 * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order 2317 * - 'I[6S]c' for IPv6 addresses printed as specified by 2318 * https://tools.ietf.org/html/rfc5952 2319 * - 'E[achnops]' For an escaped buffer, where rules are defined by combination 2320 * of the following flags (see string_escape_mem() for the 2321 * details): 2322 * a - ESCAPE_ANY 2323 * c - ESCAPE_SPECIAL 2324 * h - ESCAPE_HEX 2325 * n - ESCAPE_NULL 2326 * o - ESCAPE_OCTAL 2327 * p - ESCAPE_NP 2328 * s - ESCAPE_SPACE 2329 * By default ESCAPE_ANY_NP is used. 2330 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form 2331 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" 2332 * Options for %pU are: 2333 * b big endian lower case hex (default) 2334 * B big endian UPPER case hex 2335 * l little endian lower case hex 2336 * L little endian UPPER case hex 2337 * big endian output byte order is: 2338 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] 2339 * little endian output byte order is: 2340 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] 2341 * - 'V' For a struct va_format which contains a format string * and va_list *, 2342 * call vsnprintf(->format, *->va_list). 2343 * Implements a "recursive vsnprintf". 2344 * Do not use this feature without some mechanism to verify the 2345 * correctness of the format string and va_list arguments. 2346 * - 'K' For a kernel pointer that should be hidden from unprivileged users. 2347 * Use only for procfs, sysfs and similar files, not printk(); please 2348 * read the documentation (path below) first. 2349 * - 'NF' For a netdev_features_t 2350 * - '4cc' V4L2 or DRM FourCC code, with endianness and raw numerical value. 2351 * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with 2352 * a certain separator (' ' by default): 2353 * C colon 2354 * D dash 2355 * N no separator 2356 * The maximum supported length is 64 bytes of the input. Consider 2357 * to use print_hex_dump() for the larger input. 2358 * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives 2359 * (default assumed to be phys_addr_t, passed by reference) 2360 * - 'd[234]' For a dentry name (optionally 2-4 last components) 2361 * - 'D[234]' Same as 'd' but for a struct file 2362 * - 'g' For block_device name (gendisk + partition number) 2363 * - 't[RT][dt][r][s]' For time and date as represented by: 2364 * R struct rtc_time 2365 * T time64_t 2366 * - 'C' For a clock, it prints the name (Common Clock Framework) or address 2367 * (legacy clock framework) of the clock 2368 * - 'Cn' For a clock, it prints the name (Common Clock Framework) or address 2369 * (legacy clock framework) of the clock 2370 * - 'G' For flags to be printed as a collection of symbolic strings that would 2371 * construct the specific value. Supported flags given by option: 2372 * p page flags (see struct page) given as pointer to unsigned long 2373 * g gfp flags (GFP_* and __GFP_*) given as pointer to gfp_t 2374 * v vma flags (VM_*) given as pointer to unsigned long 2375 * - 'OF[fnpPcCF]' For a device tree object 2376 * Without any optional arguments prints the full_name 2377 * f device node full_name 2378 * n device node name 2379 * p device node phandle 2380 * P device node path spec (name + @unit) 2381 * F device node flags 2382 * c major compatible string 2383 * C full compatible string 2384 * - 'fw[fP]' For a firmware node (struct fwnode_handle) pointer 2385 * Without an option prints the full name of the node 2386 * f full name 2387 * P node name, including a possible unit address 2388 * - 'x' For printing the address unmodified. Equivalent to "%lx". 2389 * Please read the documentation (path below) before using! 2390 * - '[ku]s' For a BPF/tracing related format specifier, e.g. used out of 2391 * bpf_trace_printk() where [ku] prefix specifies either kernel (k) 2392 * or user (u) memory to probe, and: 2393 * s a string, equivalent to "%s" on direct vsnprintf() use 2394 * 2395 * ** When making changes please also update: 2396 * Documentation/core-api/printk-formats.rst 2397 * 2398 * Note: The default behaviour (unadorned %p) is to hash the address, 2399 * rendering it useful as a unique identifier. 2400 * 2401 * There is also a '%pA' format specifier, but it is only intended to be used 2402 * from Rust code to format core::fmt::Arguments. Do *not* use it from C. 2403 * See rust/kernel/print.rs for details. 2404 */ 2405 static noinline_for_stack 2406 char *pointer(const char *fmt, char *buf, char *end, void *ptr, 2407 struct printf_spec spec) 2408 { 2409 switch (*fmt) { 2410 case 'S': 2411 case 's': 2412 ptr = dereference_symbol_descriptor(ptr); 2413 fallthrough; 2414 case 'B': 2415 return symbol_string(buf, end, ptr, spec, fmt); 2416 case 'R': 2417 case 'r': 2418 return resource_string(buf, end, ptr, spec, fmt); 2419 case 'h': 2420 return hex_string(buf, end, ptr, spec, fmt); 2421 case 'b': 2422 switch (fmt[1]) { 2423 case 'l': 2424 return bitmap_list_string(buf, end, ptr, spec, fmt); 2425 default: 2426 return bitmap_string(buf, end, ptr, spec, fmt); 2427 } 2428 case 'M': /* Colon separated: 00:01:02:03:04:05 */ 2429 case 'm': /* Contiguous: 000102030405 */ 2430 /* [mM]F (FDDI) */ 2431 /* [mM]R (Reverse order; Bluetooth) */ 2432 return mac_address_string(buf, end, ptr, spec, fmt); 2433 case 'I': /* Formatted IP supported 2434 * 4: 1.2.3.4 2435 * 6: 0001:0203:...:0708 2436 * 6c: 1::708 or 1::1.2.3.4 2437 */ 2438 case 'i': /* Contiguous: 2439 * 4: 001.002.003.004 2440 * 6: 000102...0f 2441 */ 2442 return ip_addr_string(buf, end, ptr, spec, fmt); 2443 case 'E': 2444 return escaped_string(buf, end, ptr, spec, fmt); 2445 case 'U': 2446 return uuid_string(buf, end, ptr, spec, fmt); 2447 case 'V': 2448 return va_format(buf, end, ptr, spec, fmt); 2449 case 'K': 2450 return restricted_pointer(buf, end, ptr, spec); 2451 case 'N': 2452 return netdev_bits(buf, end, ptr, spec, fmt); 2453 case '4': 2454 return fourcc_string(buf, end, ptr, spec, fmt); 2455 case 'a': 2456 return address_val(buf, end, ptr, spec, fmt); 2457 case 'd': 2458 return dentry_name(buf, end, ptr, spec, fmt); 2459 case 't': 2460 return time_and_date(buf, end, ptr, spec, fmt); 2461 case 'C': 2462 return clock(buf, end, ptr, spec, fmt); 2463 case 'D': 2464 return file_dentry_name(buf, end, ptr, spec, fmt); 2465 #ifdef CONFIG_BLOCK 2466 case 'g': 2467 return bdev_name(buf, end, ptr, spec, fmt); 2468 #endif 2469 2470 case 'G': 2471 return flags_string(buf, end, ptr, spec, fmt); 2472 case 'O': 2473 return device_node_string(buf, end, ptr, spec, fmt + 1); 2474 case 'f': 2475 return fwnode_string(buf, end, ptr, spec, fmt + 1); 2476 case 'A': 2477 if (!IS_ENABLED(CONFIG_RUST)) { 2478 WARN_ONCE(1, "Please remove %%pA from non-Rust code\n"); 2479 return error_string(buf, end, "(%pA?)", spec); 2480 } 2481 return rust_fmt_argument(buf, end, ptr); 2482 case 'x': 2483 return pointer_string(buf, end, ptr, spec); 2484 case 'e': 2485 /* %pe with a non-ERR_PTR gets treated as plain %p */ 2486 if (!IS_ERR(ptr)) 2487 return default_pointer(buf, end, ptr, spec); 2488 return err_ptr(buf, end, ptr, spec); 2489 case 'u': 2490 case 'k': 2491 switch (fmt[1]) { 2492 case 's': 2493 return string(buf, end, ptr, spec); 2494 default: 2495 return error_string(buf, end, "(einval)", spec); 2496 } 2497 default: 2498 return default_pointer(buf, end, ptr, spec); 2499 } 2500 } 2501 2502 /* 2503 * Helper function to decode printf style format. 2504 * Each call decode a token from the format and return the 2505 * number of characters read (or likely the delta where it wants 2506 * to go on the next call). 2507 * The decoded token is returned through the parameters 2508 * 2509 * 'h', 'l', or 'L' for integer fields 2510 * 'z' support added 23/7/1999 S.H. 2511 * 'z' changed to 'Z' --davidm 1/25/99 2512 * 'Z' changed to 'z' --adobriyan 2017-01-25 2513 * 't' added for ptrdiff_t 2514 * 2515 * @fmt: the format string 2516 * @type of the token returned 2517 * @flags: various flags such as +, -, # tokens.. 2518 * @field_width: overwritten width 2519 * @base: base of the number (octal, hex, ...) 2520 * @precision: precision of a number 2521 * @qualifier: qualifier of a number (long, size_t, ...) 2522 */ 2523 static noinline_for_stack 2524 int format_decode(const char *fmt, struct printf_spec *spec) 2525 { 2526 const char *start = fmt; 2527 char qualifier; 2528 2529 /* we finished early by reading the field width */ 2530 if (spec->type == FORMAT_TYPE_WIDTH) { 2531 if (spec->field_width < 0) { 2532 spec->field_width = -spec->field_width; 2533 spec->flags |= LEFT; 2534 } 2535 spec->type = FORMAT_TYPE_NONE; 2536 goto precision; 2537 } 2538 2539 /* we finished early by reading the precision */ 2540 if (spec->type == FORMAT_TYPE_PRECISION) { 2541 if (spec->precision < 0) 2542 spec->precision = 0; 2543 2544 spec->type = FORMAT_TYPE_NONE; 2545 goto qualifier; 2546 } 2547 2548 /* By default */ 2549 spec->type = FORMAT_TYPE_NONE; 2550 2551 for (; *fmt ; ++fmt) { 2552 if (*fmt == '%') 2553 break; 2554 } 2555 2556 /* Return the current non-format string */ 2557 if (fmt != start || !*fmt) 2558 return fmt - start; 2559 2560 /* Process flags */ 2561 spec->flags = 0; 2562 2563 while (1) { /* this also skips first '%' */ 2564 bool found = true; 2565 2566 ++fmt; 2567 2568 switch (*fmt) { 2569 case '-': spec->flags |= LEFT; break; 2570 case '+': spec->flags |= PLUS; break; 2571 case ' ': spec->flags |= SPACE; break; 2572 case '#': spec->flags |= SPECIAL; break; 2573 case '0': spec->flags |= ZEROPAD; break; 2574 default: found = false; 2575 } 2576 2577 if (!found) 2578 break; 2579 } 2580 2581 /* get field width */ 2582 spec->field_width = -1; 2583 2584 if (isdigit(*fmt)) 2585 spec->field_width = skip_atoi(&fmt); 2586 else if (*fmt == '*') { 2587 /* it's the next argument */ 2588 spec->type = FORMAT_TYPE_WIDTH; 2589 return ++fmt - start; 2590 } 2591 2592 precision: 2593 /* get the precision */ 2594 spec->precision = -1; 2595 if (*fmt == '.') { 2596 ++fmt; 2597 if (isdigit(*fmt)) { 2598 spec->precision = skip_atoi(&fmt); 2599 if (spec->precision < 0) 2600 spec->precision = 0; 2601 } else if (*fmt == '*') { 2602 /* it's the next argument */ 2603 spec->type = FORMAT_TYPE_PRECISION; 2604 return ++fmt - start; 2605 } 2606 } 2607 2608 qualifier: 2609 /* get the conversion qualifier */ 2610 qualifier = 0; 2611 if (*fmt == 'h' || _tolower(*fmt) == 'l' || 2612 *fmt == 'z' || *fmt == 't') { 2613 qualifier = *fmt++; 2614 if (unlikely(qualifier == *fmt)) { 2615 if (qualifier == 'l') { 2616 qualifier = 'L'; 2617 ++fmt; 2618 } else if (qualifier == 'h') { 2619 qualifier = 'H'; 2620 ++fmt; 2621 } 2622 } 2623 } 2624 2625 /* default base */ 2626 spec->base = 10; 2627 switch (*fmt) { 2628 case 'c': 2629 spec->type = FORMAT_TYPE_CHAR; 2630 return ++fmt - start; 2631 2632 case 's': 2633 spec->type = FORMAT_TYPE_STR; 2634 return ++fmt - start; 2635 2636 case 'p': 2637 spec->type = FORMAT_TYPE_PTR; 2638 return ++fmt - start; 2639 2640 case '%': 2641 spec->type = FORMAT_TYPE_PERCENT_CHAR; 2642 return ++fmt - start; 2643 2644 /* integer number formats - set up the flags and "break" */ 2645 case 'o': 2646 spec->base = 8; 2647 break; 2648 2649 case 'x': 2650 spec->flags |= SMALL; 2651 fallthrough; 2652 2653 case 'X': 2654 spec->base = 16; 2655 break; 2656 2657 case 'd': 2658 case 'i': 2659 spec->flags |= SIGN; 2660 break; 2661 case 'u': 2662 break; 2663 2664 case 'n': 2665 /* 2666 * Since %n poses a greater security risk than 2667 * utility, treat it as any other invalid or 2668 * unsupported format specifier. 2669 */ 2670 fallthrough; 2671 2672 default: 2673 WARN_ONCE(1, "Please remove unsupported %%%c in format string\n", *fmt); 2674 spec->type = FORMAT_TYPE_INVALID; 2675 return fmt - start; 2676 } 2677 2678 if (qualifier == 'L') 2679 spec->type = FORMAT_TYPE_LONG_LONG; 2680 else if (qualifier == 'l') { 2681 BUILD_BUG_ON(FORMAT_TYPE_ULONG + SIGN != FORMAT_TYPE_LONG); 2682 spec->type = FORMAT_TYPE_ULONG + (spec->flags & SIGN); 2683 } else if (qualifier == 'z') { 2684 spec->type = FORMAT_TYPE_SIZE_T; 2685 } else if (qualifier == 't') { 2686 spec->type = FORMAT_TYPE_PTRDIFF; 2687 } else if (qualifier == 'H') { 2688 BUILD_BUG_ON(FORMAT_TYPE_UBYTE + SIGN != FORMAT_TYPE_BYTE); 2689 spec->type = FORMAT_TYPE_UBYTE + (spec->flags & SIGN); 2690 } else if (qualifier == 'h') { 2691 BUILD_BUG_ON(FORMAT_TYPE_USHORT + SIGN != FORMAT_TYPE_SHORT); 2692 spec->type = FORMAT_TYPE_USHORT + (spec->flags & SIGN); 2693 } else { 2694 BUILD_BUG_ON(FORMAT_TYPE_UINT + SIGN != FORMAT_TYPE_INT); 2695 spec->type = FORMAT_TYPE_UINT + (spec->flags & SIGN); 2696 } 2697 2698 return ++fmt - start; 2699 } 2700 2701 static void 2702 set_field_width(struct printf_spec *spec, int width) 2703 { 2704 spec->field_width = width; 2705 if (WARN_ONCE(spec->field_width != width, "field width %d too large", width)) { 2706 spec->field_width = clamp(width, -FIELD_WIDTH_MAX, FIELD_WIDTH_MAX); 2707 } 2708 } 2709 2710 static void 2711 set_precision(struct printf_spec *spec, int prec) 2712 { 2713 spec->precision = prec; 2714 if (WARN_ONCE(spec->precision != prec, "precision %d too large", prec)) { 2715 spec->precision = clamp(prec, 0, PRECISION_MAX); 2716 } 2717 } 2718 2719 /** 2720 * vsnprintf - Format a string and place it in a buffer 2721 * @buf: The buffer to place the result into 2722 * @size: The size of the buffer, including the trailing null space 2723 * @fmt: The format string to use 2724 * @args: Arguments for the format string 2725 * 2726 * This function generally follows C99 vsnprintf, but has some 2727 * extensions and a few limitations: 2728 * 2729 * - ``%n`` is unsupported 2730 * - ``%p*`` is handled by pointer() 2731 * 2732 * See pointer() or Documentation/core-api/printk-formats.rst for more 2733 * extensive description. 2734 * 2735 * **Please update the documentation in both places when making changes** 2736 * 2737 * The return value is the number of characters which would 2738 * be generated for the given input, excluding the trailing 2739 * '\0', as per ISO C99. If you want to have the exact 2740 * number of characters written into @buf as return value 2741 * (not including the trailing '\0'), use vscnprintf(). If the 2742 * return is greater than or equal to @size, the resulting 2743 * string is truncated. 2744 * 2745 * If you're not already dealing with a va_list consider using snprintf(). 2746 */ 2747 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) 2748 { 2749 unsigned long long num; 2750 char *str, *end; 2751 struct printf_spec spec = {0}; 2752 2753 /* Reject out-of-range values early. Large positive sizes are 2754 used for unknown buffer sizes. */ 2755 if (WARN_ON_ONCE(size > INT_MAX)) 2756 return 0; 2757 2758 str = buf; 2759 end = buf + size; 2760 2761 /* Make sure end is always >= buf */ 2762 if (end < buf) { 2763 end = ((void *)-1); 2764 size = end - buf; 2765 } 2766 2767 while (*fmt) { 2768 const char *old_fmt = fmt; 2769 int read = format_decode(fmt, &spec); 2770 2771 fmt += read; 2772 2773 switch (spec.type) { 2774 case FORMAT_TYPE_NONE: { 2775 int copy = read; 2776 if (str < end) { 2777 if (copy > end - str) 2778 copy = end - str; 2779 memcpy(str, old_fmt, copy); 2780 } 2781 str += read; 2782 break; 2783 } 2784 2785 case FORMAT_TYPE_WIDTH: 2786 set_field_width(&spec, va_arg(args, int)); 2787 break; 2788 2789 case FORMAT_TYPE_PRECISION: 2790 set_precision(&spec, va_arg(args, int)); 2791 break; 2792 2793 case FORMAT_TYPE_CHAR: { 2794 char c; 2795 2796 if (!(spec.flags & LEFT)) { 2797 while (--spec.field_width > 0) { 2798 if (str < end) 2799 *str = ' '; 2800 ++str; 2801 2802 } 2803 } 2804 c = (unsigned char) va_arg(args, int); 2805 if (str < end) 2806 *str = c; 2807 ++str; 2808 while (--spec.field_width > 0) { 2809 if (str < end) 2810 *str = ' '; 2811 ++str; 2812 } 2813 break; 2814 } 2815 2816 case FORMAT_TYPE_STR: 2817 str = string(str, end, va_arg(args, char *), spec); 2818 break; 2819 2820 case FORMAT_TYPE_PTR: 2821 str = pointer(fmt, str, end, va_arg(args, void *), 2822 spec); 2823 while (isalnum(*fmt)) 2824 fmt++; 2825 break; 2826 2827 case FORMAT_TYPE_PERCENT_CHAR: 2828 if (str < end) 2829 *str = '%'; 2830 ++str; 2831 break; 2832 2833 case FORMAT_TYPE_INVALID: 2834 /* 2835 * Presumably the arguments passed gcc's type 2836 * checking, but there is no safe or sane way 2837 * for us to continue parsing the format and 2838 * fetching from the va_list; the remaining 2839 * specifiers and arguments would be out of 2840 * sync. 2841 */ 2842 goto out; 2843 2844 default: 2845 switch (spec.type) { 2846 case FORMAT_TYPE_LONG_LONG: 2847 num = va_arg(args, long long); 2848 break; 2849 case FORMAT_TYPE_ULONG: 2850 num = va_arg(args, unsigned long); 2851 break; 2852 case FORMAT_TYPE_LONG: 2853 num = va_arg(args, long); 2854 break; 2855 case FORMAT_TYPE_SIZE_T: 2856 if (spec.flags & SIGN) 2857 num = va_arg(args, ssize_t); 2858 else 2859 num = va_arg(args, size_t); 2860 break; 2861 case FORMAT_TYPE_PTRDIFF: 2862 num = va_arg(args, ptrdiff_t); 2863 break; 2864 case FORMAT_TYPE_UBYTE: 2865 num = (unsigned char) va_arg(args, int); 2866 break; 2867 case FORMAT_TYPE_BYTE: 2868 num = (signed char) va_arg(args, int); 2869 break; 2870 case FORMAT_TYPE_USHORT: 2871 num = (unsigned short) va_arg(args, int); 2872 break; 2873 case FORMAT_TYPE_SHORT: 2874 num = (short) va_arg(args, int); 2875 break; 2876 case FORMAT_TYPE_INT: 2877 num = (int) va_arg(args, int); 2878 break; 2879 default: 2880 num = va_arg(args, unsigned int); 2881 } 2882 2883 str = number(str, end, num, spec); 2884 } 2885 } 2886 2887 out: 2888 if (size > 0) { 2889 if (str < end) 2890 *str = '\0'; 2891 else 2892 end[-1] = '\0'; 2893 } 2894 2895 /* the trailing null byte doesn't count towards the total */ 2896 return str-buf; 2897 2898 } 2899 EXPORT_SYMBOL(vsnprintf); 2900 2901 /** 2902 * vscnprintf - Format a string and place it in a buffer 2903 * @buf: The buffer to place the result into 2904 * @size: The size of the buffer, including the trailing null space 2905 * @fmt: The format string to use 2906 * @args: Arguments for the format string 2907 * 2908 * The return value is the number of characters which have been written into 2909 * the @buf not including the trailing '\0'. If @size is == 0 the function 2910 * returns 0. 2911 * 2912 * If you're not already dealing with a va_list consider using scnprintf(). 2913 * 2914 * See the vsnprintf() documentation for format string extensions over C99. 2915 */ 2916 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) 2917 { 2918 int i; 2919 2920 if (unlikely(!size)) 2921 return 0; 2922 2923 i = vsnprintf(buf, size, fmt, args); 2924 2925 if (likely(i < size)) 2926 return i; 2927 2928 return size - 1; 2929 } 2930 EXPORT_SYMBOL(vscnprintf); 2931 2932 /** 2933 * snprintf - Format a string and place it in a buffer 2934 * @buf: The buffer to place the result into 2935 * @size: The size of the buffer, including the trailing null space 2936 * @fmt: The format string to use 2937 * @...: Arguments for the format string 2938 * 2939 * The return value is the number of characters which would be 2940 * generated for the given input, excluding the trailing null, 2941 * as per ISO C99. If the return is greater than or equal to 2942 * @size, the resulting string is truncated. 2943 * 2944 * See the vsnprintf() documentation for format string extensions over C99. 2945 */ 2946 int snprintf(char *buf, size_t size, const char *fmt, ...) 2947 { 2948 va_list args; 2949 int i; 2950 2951 va_start(args, fmt); 2952 i = vsnprintf(buf, size, fmt, args); 2953 va_end(args); 2954 2955 return i; 2956 } 2957 EXPORT_SYMBOL(snprintf); 2958 2959 /** 2960 * scnprintf - Format a string and place it in a buffer 2961 * @buf: The buffer to place the result into 2962 * @size: The size of the buffer, including the trailing null space 2963 * @fmt: The format string to use 2964 * @...: Arguments for the format string 2965 * 2966 * The return value is the number of characters written into @buf not including 2967 * the trailing '\0'. If @size is == 0 the function returns 0. 2968 */ 2969 2970 int scnprintf(char *buf, size_t size, const char *fmt, ...) 2971 { 2972 va_list args; 2973 int i; 2974 2975 va_start(args, fmt); 2976 i = vscnprintf(buf, size, fmt, args); 2977 va_end(args); 2978 2979 return i; 2980 } 2981 EXPORT_SYMBOL(scnprintf); 2982 2983 /** 2984 * vsprintf - Format a string and place it in a buffer 2985 * @buf: The buffer to place the result into 2986 * @fmt: The format string to use 2987 * @args: Arguments for the format string 2988 * 2989 * The function returns the number of characters written 2990 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid 2991 * buffer overflows. 2992 * 2993 * If you're not already dealing with a va_list consider using sprintf(). 2994 * 2995 * See the vsnprintf() documentation for format string extensions over C99. 2996 */ 2997 int vsprintf(char *buf, const char *fmt, va_list args) 2998 { 2999 return vsnprintf(buf, INT_MAX, fmt, args); 3000 } 3001 EXPORT_SYMBOL(vsprintf); 3002 3003 /** 3004 * sprintf - Format a string and place it in a buffer 3005 * @buf: The buffer to place the result into 3006 * @fmt: The format string to use 3007 * @...: Arguments for the format string 3008 * 3009 * The function returns the number of characters written 3010 * into @buf. Use snprintf() or scnprintf() in order to avoid 3011 * buffer overflows. 3012 * 3013 * See the vsnprintf() documentation for format string extensions over C99. 3014 */ 3015 int sprintf(char *buf, const char *fmt, ...) 3016 { 3017 va_list args; 3018 int i; 3019 3020 va_start(args, fmt); 3021 i = vsnprintf(buf, INT_MAX, fmt, args); 3022 va_end(args); 3023 3024 return i; 3025 } 3026 EXPORT_SYMBOL(sprintf); 3027 3028 #ifdef CONFIG_BINARY_PRINTF 3029 /* 3030 * bprintf service: 3031 * vbin_printf() - VA arguments to binary data 3032 * bstr_printf() - Binary data to text string 3033 */ 3034 3035 /** 3036 * vbin_printf - Parse a format string and place args' binary value in a buffer 3037 * @bin_buf: The buffer to place args' binary value 3038 * @size: The size of the buffer(by words(32bits), not characters) 3039 * @fmt: The format string to use 3040 * @args: Arguments for the format string 3041 * 3042 * The format follows C99 vsnprintf, except %n is ignored, and its argument 3043 * is skipped. 3044 * 3045 * The return value is the number of words(32bits) which would be generated for 3046 * the given input. 3047 * 3048 * NOTE: 3049 * If the return value is greater than @size, the resulting bin_buf is NOT 3050 * valid for bstr_printf(). 3051 */ 3052 int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) 3053 { 3054 struct printf_spec spec = {0}; 3055 char *str, *end; 3056 int width; 3057 3058 str = (char *)bin_buf; 3059 end = (char *)(bin_buf + size); 3060 3061 #define save_arg(type) \ 3062 ({ \ 3063 unsigned long long value; \ 3064 if (sizeof(type) == 8) { \ 3065 unsigned long long val8; \ 3066 str = PTR_ALIGN(str, sizeof(u32)); \ 3067 val8 = va_arg(args, unsigned long long); \ 3068 if (str + sizeof(type) <= end) { \ 3069 *(u32 *)str = *(u32 *)&val8; \ 3070 *(u32 *)(str + 4) = *((u32 *)&val8 + 1); \ 3071 } \ 3072 value = val8; \ 3073 } else { \ 3074 unsigned int val4; \ 3075 str = PTR_ALIGN(str, sizeof(type)); \ 3076 val4 = va_arg(args, int); \ 3077 if (str + sizeof(type) <= end) \ 3078 *(typeof(type) *)str = (type)(long)val4; \ 3079 value = (unsigned long long)val4; \ 3080 } \ 3081 str += sizeof(type); \ 3082 value; \ 3083 }) 3084 3085 while (*fmt) { 3086 int read = format_decode(fmt, &spec); 3087 3088 fmt += read; 3089 3090 switch (spec.type) { 3091 case FORMAT_TYPE_NONE: 3092 case FORMAT_TYPE_PERCENT_CHAR: 3093 break; 3094 case FORMAT_TYPE_INVALID: 3095 goto out; 3096 3097 case FORMAT_TYPE_WIDTH: 3098 case FORMAT_TYPE_PRECISION: 3099 width = (int)save_arg(int); 3100 /* Pointers may require the width */ 3101 if (*fmt == 'p') 3102 set_field_width(&spec, width); 3103 break; 3104 3105 case FORMAT_TYPE_CHAR: 3106 save_arg(char); 3107 break; 3108 3109 case FORMAT_TYPE_STR: { 3110 const char *save_str = va_arg(args, char *); 3111 const char *err_msg; 3112 size_t len; 3113 3114 err_msg = check_pointer_msg(save_str); 3115 if (err_msg) 3116 save_str = err_msg; 3117 3118 len = strlen(save_str) + 1; 3119 if (str + len < end) 3120 memcpy(str, save_str, len); 3121 str += len; 3122 break; 3123 } 3124 3125 case FORMAT_TYPE_PTR: 3126 /* Dereferenced pointers must be done now */ 3127 switch (*fmt) { 3128 /* Dereference of functions is still OK */ 3129 case 'S': 3130 case 's': 3131 case 'x': 3132 case 'K': 3133 case 'e': 3134 save_arg(void *); 3135 break; 3136 default: 3137 if (!isalnum(*fmt)) { 3138 save_arg(void *); 3139 break; 3140 } 3141 str = pointer(fmt, str, end, va_arg(args, void *), 3142 spec); 3143 if (str + 1 < end) 3144 *str++ = '\0'; 3145 else 3146 end[-1] = '\0'; /* Must be nul terminated */ 3147 } 3148 /* skip all alphanumeric pointer suffixes */ 3149 while (isalnum(*fmt)) 3150 fmt++; 3151 break; 3152 3153 default: 3154 switch (spec.type) { 3155 3156 case FORMAT_TYPE_LONG_LONG: 3157 save_arg(long long); 3158 break; 3159 case FORMAT_TYPE_ULONG: 3160 case FORMAT_TYPE_LONG: 3161 save_arg(unsigned long); 3162 break; 3163 case FORMAT_TYPE_SIZE_T: 3164 save_arg(size_t); 3165 break; 3166 case FORMAT_TYPE_PTRDIFF: 3167 save_arg(ptrdiff_t); 3168 break; 3169 case FORMAT_TYPE_UBYTE: 3170 case FORMAT_TYPE_BYTE: 3171 save_arg(char); 3172 break; 3173 case FORMAT_TYPE_USHORT: 3174 case FORMAT_TYPE_SHORT: 3175 save_arg(short); 3176 break; 3177 default: 3178 save_arg(int); 3179 } 3180 } 3181 } 3182 3183 out: 3184 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; 3185 #undef save_arg 3186 } 3187 EXPORT_SYMBOL_GPL(vbin_printf); 3188 3189 /** 3190 * bstr_printf - Format a string from binary arguments and place it in a buffer 3191 * @buf: The buffer to place the result into 3192 * @size: The size of the buffer, including the trailing null space 3193 * @fmt: The format string to use 3194 * @bin_buf: Binary arguments for the format string 3195 * 3196 * This function like C99 vsnprintf, but the difference is that vsnprintf gets 3197 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is 3198 * a binary buffer that generated by vbin_printf. 3199 * 3200 * The format follows C99 vsnprintf, but has some extensions: 3201 * see vsnprintf comment for details. 3202 * 3203 * The return value is the number of characters which would 3204 * be generated for the given input, excluding the trailing 3205 * '\0', as per ISO C99. If you want to have the exact 3206 * number of characters written into @buf as return value 3207 * (not including the trailing '\0'), use vscnprintf(). If the 3208 * return is greater than or equal to @size, the resulting 3209 * string is truncated. 3210 */ 3211 int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) 3212 { 3213 struct printf_spec spec = {0}; 3214 char *str, *end; 3215 const char *args = (const char *)bin_buf; 3216 3217 if (WARN_ON_ONCE(size > INT_MAX)) 3218 return 0; 3219 3220 str = buf; 3221 end = buf + size; 3222 3223 #define get_arg(type) \ 3224 ({ \ 3225 typeof(type) value; \ 3226 if (sizeof(type) == 8) { \ 3227 args = PTR_ALIGN(args, sizeof(u32)); \ 3228 *(u32 *)&value = *(u32 *)args; \ 3229 *((u32 *)&value + 1) = *(u32 *)(args + 4); \ 3230 } else { \ 3231 args = PTR_ALIGN(args, sizeof(type)); \ 3232 value = *(typeof(type) *)args; \ 3233 } \ 3234 args += sizeof(type); \ 3235 value; \ 3236 }) 3237 3238 /* Make sure end is always >= buf */ 3239 if (end < buf) { 3240 end = ((void *)-1); 3241 size = end - buf; 3242 } 3243 3244 while (*fmt) { 3245 const char *old_fmt = fmt; 3246 int read = format_decode(fmt, &spec); 3247 3248 fmt += read; 3249 3250 switch (spec.type) { 3251 case FORMAT_TYPE_NONE: { 3252 int copy = read; 3253 if (str < end) { 3254 if (copy > end - str) 3255 copy = end - str; 3256 memcpy(str, old_fmt, copy); 3257 } 3258 str += read; 3259 break; 3260 } 3261 3262 case FORMAT_TYPE_WIDTH: 3263 set_field_width(&spec, get_arg(int)); 3264 break; 3265 3266 case FORMAT_TYPE_PRECISION: 3267 set_precision(&spec, get_arg(int)); 3268 break; 3269 3270 case FORMAT_TYPE_CHAR: { 3271 char c; 3272 3273 if (!(spec.flags & LEFT)) { 3274 while (--spec.field_width > 0) { 3275 if (str < end) 3276 *str = ' '; 3277 ++str; 3278 } 3279 } 3280 c = (unsigned char) get_arg(char); 3281 if (str < end) 3282 *str = c; 3283 ++str; 3284 while (--spec.field_width > 0) { 3285 if (str < end) 3286 *str = ' '; 3287 ++str; 3288 } 3289 break; 3290 } 3291 3292 case FORMAT_TYPE_STR: { 3293 const char *str_arg = args; 3294 args += strlen(str_arg) + 1; 3295 str = string(str, end, (char *)str_arg, spec); 3296 break; 3297 } 3298 3299 case FORMAT_TYPE_PTR: { 3300 bool process = false; 3301 int copy, len; 3302 /* Non function dereferences were already done */ 3303 switch (*fmt) { 3304 case 'S': 3305 case 's': 3306 case 'x': 3307 case 'K': 3308 case 'e': 3309 process = true; 3310 break; 3311 default: 3312 if (!isalnum(*fmt)) { 3313 process = true; 3314 break; 3315 } 3316 /* Pointer dereference was already processed */ 3317 if (str < end) { 3318 len = copy = strlen(args); 3319 if (copy > end - str) 3320 copy = end - str; 3321 memcpy(str, args, copy); 3322 str += len; 3323 args += len + 1; 3324 } 3325 } 3326 if (process) 3327 str = pointer(fmt, str, end, get_arg(void *), spec); 3328 3329 while (isalnum(*fmt)) 3330 fmt++; 3331 break; 3332 } 3333 3334 case FORMAT_TYPE_PERCENT_CHAR: 3335 if (str < end) 3336 *str = '%'; 3337 ++str; 3338 break; 3339 3340 case FORMAT_TYPE_INVALID: 3341 goto out; 3342 3343 default: { 3344 unsigned long long num; 3345 3346 switch (spec.type) { 3347 3348 case FORMAT_TYPE_LONG_LONG: 3349 num = get_arg(long long); 3350 break; 3351 case FORMAT_TYPE_ULONG: 3352 case FORMAT_TYPE_LONG: 3353 num = get_arg(unsigned long); 3354 break; 3355 case FORMAT_TYPE_SIZE_T: 3356 num = get_arg(size_t); 3357 break; 3358 case FORMAT_TYPE_PTRDIFF: 3359 num = get_arg(ptrdiff_t); 3360 break; 3361 case FORMAT_TYPE_UBYTE: 3362 num = get_arg(unsigned char); 3363 break; 3364 case FORMAT_TYPE_BYTE: 3365 num = get_arg(signed char); 3366 break; 3367 case FORMAT_TYPE_USHORT: 3368 num = get_arg(unsigned short); 3369 break; 3370 case FORMAT_TYPE_SHORT: 3371 num = get_arg(short); 3372 break; 3373 case FORMAT_TYPE_UINT: 3374 num = get_arg(unsigned int); 3375 break; 3376 default: 3377 num = get_arg(int); 3378 } 3379 3380 str = number(str, end, num, spec); 3381 } /* default: */ 3382 } /* switch(spec.type) */ 3383 } /* while(*fmt) */ 3384 3385 out: 3386 if (size > 0) { 3387 if (str < end) 3388 *str = '\0'; 3389 else 3390 end[-1] = '\0'; 3391 } 3392 3393 #undef get_arg 3394 3395 /* the trailing null byte doesn't count towards the total */ 3396 return str - buf; 3397 } 3398 EXPORT_SYMBOL_GPL(bstr_printf); 3399 3400 /** 3401 * bprintf - Parse a format string and place args' binary value in a buffer 3402 * @bin_buf: The buffer to place args' binary value 3403 * @size: The size of the buffer(by words(32bits), not characters) 3404 * @fmt: The format string to use 3405 * @...: Arguments for the format string 3406 * 3407 * The function returns the number of words(u32) written 3408 * into @bin_buf. 3409 */ 3410 int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) 3411 { 3412 va_list args; 3413 int ret; 3414 3415 va_start(args, fmt); 3416 ret = vbin_printf(bin_buf, size, fmt, args); 3417 va_end(args); 3418 3419 return ret; 3420 } 3421 EXPORT_SYMBOL_GPL(bprintf); 3422 3423 #endif /* CONFIG_BINARY_PRINTF */ 3424 3425 /** 3426 * vsscanf - Unformat a buffer into a list of arguments 3427 * @buf: input buffer 3428 * @fmt: format of buffer 3429 * @args: arguments 3430 */ 3431 int vsscanf(const char *buf, const char *fmt, va_list args) 3432 { 3433 const char *str = buf; 3434 char *next; 3435 char digit; 3436 int num = 0; 3437 u8 qualifier; 3438 unsigned int base; 3439 union { 3440 long long s; 3441 unsigned long long u; 3442 } val; 3443 s16 field_width; 3444 bool is_sign; 3445 3446 while (*fmt) { 3447 /* skip any white space in format */ 3448 /* white space in format matches any amount of 3449 * white space, including none, in the input. 3450 */ 3451 if (isspace(*fmt)) { 3452 fmt = skip_spaces(++fmt); 3453 str = skip_spaces(str); 3454 } 3455 3456 /* anything that is not a conversion must match exactly */ 3457 if (*fmt != '%' && *fmt) { 3458 if (*fmt++ != *str++) 3459 break; 3460 continue; 3461 } 3462 3463 if (!*fmt) 3464 break; 3465 ++fmt; 3466 3467 /* skip this conversion. 3468 * advance both strings to next white space 3469 */ 3470 if (*fmt == '*') { 3471 if (!*str) 3472 break; 3473 while (!isspace(*fmt) && *fmt != '%' && *fmt) { 3474 /* '%*[' not yet supported, invalid format */ 3475 if (*fmt == '[') 3476 return num; 3477 fmt++; 3478 } 3479 while (!isspace(*str) && *str) 3480 str++; 3481 continue; 3482 } 3483 3484 /* get field width */ 3485 field_width = -1; 3486 if (isdigit(*fmt)) { 3487 field_width = skip_atoi(&fmt); 3488 if (field_width <= 0) 3489 break; 3490 } 3491 3492 /* get conversion qualifier */ 3493 qualifier = -1; 3494 if (*fmt == 'h' || _tolower(*fmt) == 'l' || 3495 *fmt == 'z') { 3496 qualifier = *fmt++; 3497 if (unlikely(qualifier == *fmt)) { 3498 if (qualifier == 'h') { 3499 qualifier = 'H'; 3500 fmt++; 3501 } else if (qualifier == 'l') { 3502 qualifier = 'L'; 3503 fmt++; 3504 } 3505 } 3506 } 3507 3508 if (!*fmt) 3509 break; 3510 3511 if (*fmt == 'n') { 3512 /* return number of characters read so far */ 3513 *va_arg(args, int *) = str - buf; 3514 ++fmt; 3515 continue; 3516 } 3517 3518 if (!*str) 3519 break; 3520 3521 base = 10; 3522 is_sign = false; 3523 3524 switch (*fmt++) { 3525 case 'c': 3526 { 3527 char *s = (char *)va_arg(args, char*); 3528 if (field_width == -1) 3529 field_width = 1; 3530 do { 3531 *s++ = *str++; 3532 } while (--field_width > 0 && *str); 3533 num++; 3534 } 3535 continue; 3536 case 's': 3537 { 3538 char *s = (char *)va_arg(args, char *); 3539 if (field_width == -1) 3540 field_width = SHRT_MAX; 3541 /* first, skip leading white space in buffer */ 3542 str = skip_spaces(str); 3543 3544 /* now copy until next white space */ 3545 while (*str && !isspace(*str) && field_width--) 3546 *s++ = *str++; 3547 *s = '\0'; 3548 num++; 3549 } 3550 continue; 3551 /* 3552 * Warning: This implementation of the '[' conversion specifier 3553 * deviates from its glibc counterpart in the following ways: 3554 * (1) It does NOT support ranges i.e. '-' is NOT a special 3555 * character 3556 * (2) It cannot match the closing bracket ']' itself 3557 * (3) A field width is required 3558 * (4) '%*[' (discard matching input) is currently not supported 3559 * 3560 * Example usage: 3561 * ret = sscanf("00:0a:95","%2[^:]:%2[^:]:%2[^:]", 3562 * buf1, buf2, buf3); 3563 * if (ret < 3) 3564 * // etc.. 3565 */ 3566 case '[': 3567 { 3568 char *s = (char *)va_arg(args, char *); 3569 DECLARE_BITMAP(set, 256) = {0}; 3570 unsigned int len = 0; 3571 bool negate = (*fmt == '^'); 3572 3573 /* field width is required */ 3574 if (field_width == -1) 3575 return num; 3576 3577 if (negate) 3578 ++fmt; 3579 3580 for ( ; *fmt && *fmt != ']'; ++fmt, ++len) 3581 __set_bit((u8)*fmt, set); 3582 3583 /* no ']' or no character set found */ 3584 if (!*fmt || !len) 3585 return num; 3586 ++fmt; 3587 3588 if (negate) { 3589 bitmap_complement(set, set, 256); 3590 /* exclude null '\0' byte */ 3591 __clear_bit(0, set); 3592 } 3593 3594 /* match must be non-empty */ 3595 if (!test_bit((u8)*str, set)) 3596 return num; 3597 3598 while (test_bit((u8)*str, set) && field_width--) 3599 *s++ = *str++; 3600 *s = '\0'; 3601 ++num; 3602 } 3603 continue; 3604 case 'o': 3605 base = 8; 3606 break; 3607 case 'x': 3608 case 'X': 3609 base = 16; 3610 break; 3611 case 'i': 3612 base = 0; 3613 fallthrough; 3614 case 'd': 3615 is_sign = true; 3616 fallthrough; 3617 case 'u': 3618 break; 3619 case '%': 3620 /* looking for '%' in str */ 3621 if (*str++ != '%') 3622 return num; 3623 continue; 3624 default: 3625 /* invalid format; stop here */ 3626 return num; 3627 } 3628 3629 /* have some sort of integer conversion. 3630 * first, skip white space in buffer. 3631 */ 3632 str = skip_spaces(str); 3633 3634 digit = *str; 3635 if (is_sign && digit == '-') { 3636 if (field_width == 1) 3637 break; 3638 3639 digit = *(str + 1); 3640 } 3641 3642 if (!digit 3643 || (base == 16 && !isxdigit(digit)) 3644 || (base == 10 && !isdigit(digit)) 3645 || (base == 8 && (!isdigit(digit) || digit > '7')) 3646 || (base == 0 && !isdigit(digit))) 3647 break; 3648 3649 if (is_sign) 3650 val.s = simple_strntoll(str, 3651 field_width >= 0 ? field_width : INT_MAX, 3652 &next, base); 3653 else 3654 val.u = simple_strntoull(str, 3655 field_width >= 0 ? field_width : INT_MAX, 3656 &next, base); 3657 3658 switch (qualifier) { 3659 case 'H': /* that's 'hh' in format */ 3660 if (is_sign) 3661 *va_arg(args, signed char *) = val.s; 3662 else 3663 *va_arg(args, unsigned char *) = val.u; 3664 break; 3665 case 'h': 3666 if (is_sign) 3667 *va_arg(args, short *) = val.s; 3668 else 3669 *va_arg(args, unsigned short *) = val.u; 3670 break; 3671 case 'l': 3672 if (is_sign) 3673 *va_arg(args, long *) = val.s; 3674 else 3675 *va_arg(args, unsigned long *) = val.u; 3676 break; 3677 case 'L': 3678 if (is_sign) 3679 *va_arg(args, long long *) = val.s; 3680 else 3681 *va_arg(args, unsigned long long *) = val.u; 3682 break; 3683 case 'z': 3684 *va_arg(args, size_t *) = val.u; 3685 break; 3686 default: 3687 if (is_sign) 3688 *va_arg(args, int *) = val.s; 3689 else 3690 *va_arg(args, unsigned int *) = val.u; 3691 break; 3692 } 3693 num++; 3694 3695 if (!next) 3696 break; 3697 str = next; 3698 } 3699 3700 return num; 3701 } 3702 EXPORT_SYMBOL(vsscanf); 3703 3704 /** 3705 * sscanf - Unformat a buffer into a list of arguments 3706 * @buf: input buffer 3707 * @fmt: formatting of buffer 3708 * @...: resulting arguments 3709 */ 3710 int sscanf(const char *buf, const char *fmt, ...) 3711 { 3712 va_list args; 3713 int i; 3714 3715 va_start(args, fmt); 3716 i = vsscanf(buf, fmt, args); 3717 va_end(args); 3718 3719 return i; 3720 } 3721 EXPORT_SYMBOL(sscanf); 3722