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