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