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[thirdparty/linux.git] / lib / vsprintf.c
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457c8996 1// SPDX-License-Identifier: GPL-2.0-only
1da177e4
LT		 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
7b9186f5 13/*
1da177e4
LT		 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
c0891ac1 20#include <linux/stdarg.h>
ef27ac18 21#include <linux/build_bug.h>
0d1d7a55 22#include <linux/clk.h>
900cca29 23#include <linux/clk-provider.h>
57f5677e 24#include <linux/errname.h>
8bc3bcc9 25#include <linux/module.h> /* for KSYM_SYMBOL_LEN */
1da177e4
LT		 26#include <linux/types.h>
27#include <linux/string.h>
28#include <linux/ctype.h>
29#include <linux/kernel.h>
0fe1ef24 30#include <linux/kallsyms.h>
53809751 31#include <linux/math64.h>
0fe1ef24 32#include <linux/uaccess.h>
332d2e78 33#include <linux/ioport.h>
4b6ccca7 34#include <linux/dcache.h>
312b4e22 35#include <linux/cred.h>
4d42c447 36#include <linux/rtc.h>
39ced19b 37#include <linux/sprintf.h>
7daac5b2 38#include <linux/time.h>
2b1b0d66 39#include <linux/uuid.h>
ce4fecf1 40#include <linux/of.h>
8a27f7c9 41#include <net/addrconf.h>
ad67b74d
TH		 42#include <linux/siphash.h>
43#include <linux/compiler.h>
a92eb762 44#include <linux/property.h>
898f1e5c 45#include <linux/notifier.h>
1031bc58
DM		 46#ifdef CONFIG_BLOCK
47#include <linux/blkdev.h>
48#endif
1da177e4 49
edf14cdb
VB		 50#include "../mm/internal.h" /* For the trace_print_flags arrays */
51
4e57b681 52#include <asm/page.h> /* for PAGE_SIZE */
7c43d9a3 53#include <asm/byteorder.h> /* cpu_to_le16 */
d75b26f8 54#include <asm/unaligned.h>
1da177e4 55
71dca95d 56#include <linux/string_helpers.h>
1dff46d6 57#include "kstrtox.h"
aa46a63e 58
84842911
CL		 59/* Disable pointer hashing if requested */
60bool no_hash_pointers __ro_after_init;
61EXPORT_SYMBOL_GPL(no_hash_pointers);
62
839b395e 63static noinline unsigned long long simple_strntoull(const char *startp, size_t max_chars, char **endp, unsigned int base)
900fdc45
RF		 64{
65 const char *cp;
66 unsigned long long result = 0ULL;
67 size_t prefix_chars;
68 unsigned int rv;
69
70 cp = _parse_integer_fixup_radix(startp, &base);
71 prefix_chars = cp - startp;
72 if (prefix_chars < max_chars) {
73 rv = _parse_integer_limit(cp, base, &result, max_chars - prefix_chars);
74 /* FIXME */
75 cp += (rv & ~KSTRTOX_OVERFLOW);
76 } else {
77 /* Field too short for prefix + digit, skip over without converting */
78 cp = startp + max_chars;
79 }
80
81 if (endp)
82 *endp = (char *)cp;
83
84 return result;
85}
86
1da177e4 87/**
922ac25c 88 * simple_strtoull - convert a string to an unsigned long long
1da177e4
LT		 89 * @cp: The start of the string
90 * @endp: A pointer to the end of the parsed string will be placed here
91 * @base: The number base to use
462e4711 92 *
e8cc2b97 93 * This function has caveats. Please use kstrtoull instead.
1da177e4 94 */
ad65dcef 95noinline
922ac25c 96unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
1da177e4 97{
900fdc45 98 return simple_strntoull(cp, INT_MAX, endp, base);
1da177e4 99}
922ac25c 100EXPORT_SYMBOL(simple_strtoull);
1da177e4
LT		 101
102/**
922ac25c 103 * simple_strtoul - convert a string to an unsigned long
1da177e4
LT		 104 * @cp: The start of the string
105 * @endp: A pointer to the end of the parsed string will be placed here
106 * @base: The number base to use
462e4711 107 *
e8cc2b97 108 * This function has caveats. Please use kstrtoul instead.
1da177e4 109 */
922ac25c 110unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
1da177e4 111{
922ac25c 112 return simple_strtoull(cp, endp, base);
1da177e4 113}
922ac25c 114EXPORT_SYMBOL(simple_strtoul);
1da177e4
LT		 115
116/**
922ac25c 117 * simple_strtol - convert a string to a signed long
1da177e4
LT		 118 * @cp: The start of the string
119 * @endp: A pointer to the end of the parsed string will be placed here
120 * @base: The number base to use
462e4711 121 *
e8cc2b97 122 * This function has caveats. Please use kstrtol instead.
1da177e4 123 */
922ac25c 124long simple_strtol(const char *cp, char **endp, unsigned int base)
1da177e4 125{
922ac25c
AGR		 126 if (*cp == '-')
127 return -simple_strtoul(cp + 1, endp, base);
7b9186f5 128
922ac25c 129 return simple_strtoul(cp, endp, base);
1da177e4 130}
922ac25c 131EXPORT_SYMBOL(simple_strtol);
1da177e4 132
900fdc45
RF		 133static long long simple_strntoll(const char *cp, size_t max_chars, char **endp,
134 unsigned int base)
135{
136 /*
137 * simple_strntoull() safely handles receiving max_chars==0 in the
138 * case cp[0] == '-' && max_chars == 1.
139 * If max_chars == 0 we can drop through and pass it to simple_strntoull()
140 * and the content of *cp is irrelevant.
141 */
142 if (*cp == '-' && max_chars > 0)
143 return -simple_strntoull(cp + 1, max_chars - 1, endp, base);
144
145 return simple_strntoull(cp, max_chars, endp, base);
146}
147
1da177e4
LT		 148/**
149 * simple_strtoll - convert a string to a signed long long
150 * @cp: The start of the string
151 * @endp: A pointer to the end of the parsed string will be placed here
152 * @base: The number base to use
462e4711 153 *
e8cc2b97 154 * This function has caveats. Please use kstrtoll instead.
1da177e4 155 */
22d27051 156long long simple_strtoll(const char *cp, char **endp, unsigned int base)
1da177e4 157{
900fdc45 158 return simple_strntoll(cp, INT_MAX, endp, base);
1da177e4 159}
98d5ce0d 160EXPORT_SYMBOL(simple_strtoll);
1da177e4 161
cf3b429b
JP		 162static noinline_for_stack
163int skip_atoi(const char **s)
1da177e4 164{
7b9186f5 165 int i = 0;
1da177e4 166
43e5b666 167 do {
1da177e4 168 i = i*10 + *((*s)++) - '0';
43e5b666 169 } while (isdigit(**s));
7b9186f5 170
1da177e4
LT		 171 return i;
172}
173
7c43d9a3
RV		 174/*
175 * Decimal conversion is by far the most typical, and is used for
176 * /proc and /sys data. This directly impacts e.g. top performance
177 * with many processes running. We optimize it for speed by emitting
178 * two characters at a time, using a 200 byte lookup table. This
179 * roughly halves the number of multiplications compared to computing
180 * the digits one at a time. Implementation strongly inspired by the
181 * previous version, which in turn used ideas described at
182 * <http://www.cs.uiowa.edu/~jones/bcd/divide.html> (with permission
183 * from the author, Douglas W. Jones).
184 *
185 * It turns out there is precisely one 26 bit fixed-point
186 * approximation a of 64/100 for which x/100 == (x * (u64)a) >> 32
187 * holds for all x in [0, 10^8-1], namely a = 0x28f5c29. The actual
188 * range happens to be somewhat larger (x <= 1073741898), but that's
189 * irrelevant for our purpose.
190 *
191 * For dividing a number in the range [10^4, 10^6-1] by 100, we still
192 * need a 32x32->64 bit multiply, so we simply use the same constant.
193 *
194 * For dividing a number in the range [100, 10^4-1] by 100, there are
195 * several options. The simplest is (x * 0x147b) >> 19, which is valid
196 * for all x <= 43698.
133fd9f5 197 */
4277eedd 198
7c43d9a3
RV		 199static const u16 decpair[100] = {
200#define _(x) (__force u16) cpu_to_le16(((x % 10) | ((x / 10) << 8)) + 0x3030)
201 _( 0), _( 1), _( 2), _( 3), _( 4), _( 5), _( 6), _( 7), _( 8), _( 9),
202 _(10), _(11), _(12), _(13), _(14), _(15), _(16), _(17), _(18), _(19),
203 _(20), _(21), _(22), _(23), _(24), _(25), _(26), _(27), _(28), _(29),
204 _(30), _(31), _(32), _(33), _(34), _(35), _(36), _(37), _(38), _(39),
205 _(40), _(41), _(42), _(43), _(44), _(45), _(46), _(47), _(48), _(49),
206 _(50), _(51), _(52), _(53), _(54), _(55), _(56), _(57), _(58), _(59),
207 _(60), _(61), _(62), _(63), _(64), _(65), _(66), _(67), _(68), _(69),
208 _(70), _(71), _(72), _(73), _(74), _(75), _(76), _(77), _(78), _(79),
209 _(80), _(81), _(82), _(83), _(84), _(85), _(86), _(87), _(88), _(89),
210 _(90), _(91), _(92), _(93), _(94), _(95), _(96), _(97), _(98), _(99),
211#undef _
212};
213
214/*
215 * This will print a single '0' even if r == 0, since we would
675cf53c
RV		 216 * immediately jump to out_r where two 0s would be written but only
217 * one of them accounted for in buf. This is needed by ip4_string
218 * below. All other callers pass a non-zero value of r.
7c43d9a3 219*/
cf3b429b 220static noinline_for_stack
7c43d9a3 221char *put_dec_trunc8(char *buf, unsigned r)
4277eedd 222{
7c43d9a3
RV		 223 unsigned q;
224
225 /* 1 <= r < 10^8 */
226 if (r < 100)
227 goto out_r;
228
229 /* 100 <= r < 10^8 */
230 q = (r * (u64)0x28f5c29) >> 32;
231 *((u16 *)buf) = decpair[r - 100*q];
232 buf += 2;
233
234 /* 1 <= q < 10^6 */
235 if (q < 100)
236 goto out_q;
237
238 /* 100 <= q < 10^6 */
239 r = (q * (u64)0x28f5c29) >> 32;
240 *((u16 *)buf) = decpair[q - 100*r];
241 buf += 2;
242
243 /* 1 <= r < 10^4 */
244 if (r < 100)
245 goto out_r;
246
247 /* 100 <= r < 10^4 */
248 q = (r * 0x147b) >> 19;
249 *((u16 *)buf) = decpair[r - 100*q];
250 buf += 2;
251out_q:
252 /* 1 <= q < 100 */
253 r = q;
254out_r:
255 /* 1 <= r < 100 */
256 *((u16 *)buf) = decpair[r];
675cf53c 257 buf += r < 10 ? 1 : 2;
4277eedd
DV		 258 return buf;
259}
133fd9f5 260
7c43d9a3 261#if BITS_PER_LONG == 64 && BITS_PER_LONG_LONG == 64
cf3b429b 262static noinline_for_stack
7c43d9a3 263char *put_dec_full8(char *buf, unsigned r)
4277eedd 264{
133fd9f5
DV		 265 unsigned q;
266
7c43d9a3
RV		 267 /* 0 <= r < 10^8 */
268 q = (r * (u64)0x28f5c29) >> 32;
269 *((u16 *)buf) = decpair[r - 100*q];
270 buf += 2;
4277eedd 271
7c43d9a3
RV		 272 /* 0 <= q < 10^6 */
273 r = (q * (u64)0x28f5c29) >> 32;
274 *((u16 *)buf) = decpair[q - 100*r];
275 buf += 2;
7b9186f5 276
7c43d9a3
RV		 277 /* 0 <= r < 10^4 */
278 q = (r * 0x147b) >> 19;
279 *((u16 *)buf) = decpair[r - 100*q];
280 buf += 2;
133fd9f5 281
7c43d9a3
RV		 282 /* 0 <= q < 100 */
283 *((u16 *)buf) = decpair[q];
284 buf += 2;
285 return buf;
286}
133fd9f5 287
7c43d9a3 288static noinline_for_stack
133fd9f5
DV		 289char *put_dec(char *buf, unsigned long long n)
290{
7c43d9a3
RV		 291 if (n >= 100*1000*1000)
292 buf = put_dec_full8(buf, do_div(n, 100*1000*1000));
293 /* 1 <= n <= 1.6e11 */
294 if (n >= 100*1000*1000)
295 buf = put_dec_full8(buf, do_div(n, 100*1000*1000));
296 /* 1 <= n < 1e8 */
133fd9f5 297 return put_dec_trunc8(buf, n);
4277eedd 298}
133fd9f5 299
7c43d9a3 300#elif BITS_PER_LONG == 32 && BITS_PER_LONG_LONG == 64
133fd9f5 301
7c43d9a3
RV		 302static void
303put_dec_full4(char *buf, unsigned r)
4277eedd 304{
7c43d9a3
RV		 305 unsigned q;
306
307 /* 0 <= r < 10^4 */
308 q = (r * 0x147b) >> 19;
309 *((u16 *)buf) = decpair[r - 100*q];
310 buf += 2;
311 /* 0 <= q < 100 */
312 *((u16 *)buf) = decpair[q];
2359172a
GS		 313}
314
315/*
316 * Call put_dec_full4 on x % 10000, return x / 10000.
317 * The approximation x/10000 == (x * 0x346DC5D7) >> 43
318 * holds for all x < 1,128,869,999. The largest value this
319 * helper will ever be asked to convert is 1,125,520,955.
7c43d9a3 320 * (second call in the put_dec code, assuming n is all-ones).
2359172a 321 */
7c43d9a3 322static noinline_for_stack
2359172a
GS		 323unsigned put_dec_helper4(char *buf, unsigned x)
324{
325 uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43;
326
327 put_dec_full4(buf, x - q * 10000);
328 return q;
4277eedd
DV		 329}
330
133fd9f5
DV		 331/* Based on code by Douglas W. Jones found at
332 * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour>
333 * (with permission from the author).
334 * Performs no 64-bit division and hence should be fast on 32-bit machines.
335 */
336static
337char *put_dec(char *buf, unsigned long long n)
338{
339 uint32_t d3, d2, d1, q, h;
340
341 if (n < 100*1000*1000)
342 return put_dec_trunc8(buf, n);
343
344 d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */
345 h = (n >> 32);
346 d2 = (h ) & 0xffff;
347 d3 = (h >> 16); /* implicit "& 0xffff" */
348
7c43d9a3
RV		 349 /* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0
350 = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */
133fd9f5 351 q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff);
2359172a
GS		 352 q = put_dec_helper4(buf, q);
353
354 q += 7671 * d3 + 9496 * d2 + 6 * d1;
355 q = put_dec_helper4(buf+4, q);
356
357 q += 4749 * d3 + 42 * d2;
358 q = put_dec_helper4(buf+8, q);
133fd9f5 359
2359172a
GS		 360 q += 281 * d3;
361 buf += 12;
362 if (q)
363 buf = put_dec_trunc8(buf, q);
364 else while (buf[-1] == '0')
133fd9f5
DV		 365 --buf;
366
367 return buf;
368}
369
370#endif
371
1ac101a5
KH		 372/*
373 * Convert passed number to decimal string.
374 * Returns the length of string. On buffer overflow, returns 0.
375 *
376 * If speed is not important, use snprintf(). It's easy to read the code.
377 */
d1be35cb 378int num_to_str(char *buf, int size, unsigned long long num, unsigned int width)
1ac101a5 379{
7c43d9a3
RV		 380 /* put_dec requires 2-byte alignment of the buffer. */
381 char tmp[sizeof(num) * 3] __aligned(2);
1ac101a5
KH		 382 int idx, len;
383
133fd9f5
DV		 384 /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */
385 if (num <= 9) {
386 tmp[0] = '0' + num;
387 len = 1;
388 } else {
389 len = put_dec(tmp, num) - tmp;
390 }
1ac101a5 391
d1be35cb 392 if (len > size || width > size)
1ac101a5 393 return 0;
d1be35cb
AV		 394
395 if (width > len) {
396 width = width - len;
397 for (idx = 0; idx < width; idx++)
398 buf[idx] = ' ';
399 } else {
400 width = 0;
401 }
402
1ac101a5 403 for (idx = 0; idx < len; ++idx)
d1be35cb
AV		 404 buf[idx + width] = tmp[len - idx - 1];
405
406 return len + width;
1ac101a5
KH		 407}
408
51be17df 409#define SIGN 1 /* unsigned/signed, must be 1 */
d1c1b121 410#define LEFT 2 /* left justified */
1da177e4
LT		 411#define PLUS 4 /* show plus */
412#define SPACE 8 /* space if plus */
d1c1b121 413#define ZEROPAD 16 /* pad with zero, must be 16 == '0' - ' ' */
b89dc5d6
BH		 414#define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
415#define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
1da177e4 416
24a1dffb 417static_assert(SIGN == 1);
b886690d 418static_assert(ZEROPAD == ('0' - ' '));
24a1dffb 419static_assert(SMALL == ('a' ^ 'A'));
b886690d 420
fef20d9c
FW		 421enum format_type {
422 FORMAT_TYPE_NONE, /* Just a string part */
ed681a91 423 FORMAT_TYPE_WIDTH,
fef20d9c
FW		 424 FORMAT_TYPE_PRECISION,
425 FORMAT_TYPE_CHAR,
426 FORMAT_TYPE_STR,
427 FORMAT_TYPE_PTR,
428 FORMAT_TYPE_PERCENT_CHAR,
429 FORMAT_TYPE_INVALID,
430 FORMAT_TYPE_LONG_LONG,
431 FORMAT_TYPE_ULONG,
432 FORMAT_TYPE_LONG,
a4e94ef0
Z		 433 FORMAT_TYPE_UBYTE,
434 FORMAT_TYPE_BYTE,
fef20d9c
FW		 435 FORMAT_TYPE_USHORT,
436 FORMAT_TYPE_SHORT,
437 FORMAT_TYPE_UINT,
438 FORMAT_TYPE_INT,
fef20d9c
FW		 439 FORMAT_TYPE_SIZE_T,
440 FORMAT_TYPE_PTRDIFF
441};
442
443struct printf_spec {
d0484193
RV		 444 unsigned int type:8; /* format_type enum */
445 signed int field_width:24; /* width of output field */
446 unsigned int flags:8; /* flags to number() */
447 unsigned int base:8; /* number base, 8, 10 or 16 only */
448 signed int precision:16; /* # of digits/chars */
449} __packed;
ef27ac18
RV		 450static_assert(sizeof(struct printf_spec) == 8);
451
4d72ba01
RV		 452#define FIELD_WIDTH_MAX ((1 << 23) - 1)
453#define PRECISION_MAX ((1 << 15) - 1)
fef20d9c 454
cf3b429b
JP		 455static noinline_for_stack
456char *number(char *buf, char *end, unsigned long long num,
457 struct printf_spec spec)
1da177e4 458{
7c43d9a3
RV		 459 /* put_dec requires 2-byte alignment of the buffer. */
460 char tmp[3 * sizeof(num)] __aligned(2);
9b706aee
DV		 461 char sign;
462 char locase;
fef20d9c 463 int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
1da177e4 464 int i;
7c203422 465 bool is_zero = num == 0LL;
1c7a8e62
RV		 466 int field_width = spec.field_width;
467 int precision = spec.precision;
1da177e4 468
9b706aee
DV		 469 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
470 * produces same digits or (maybe lowercased) letters */
fef20d9c
FW		 471 locase = (spec.flags & SMALL);
472 if (spec.flags & LEFT)
473 spec.flags &= ~ZEROPAD;
1da177e4 474 sign = 0;
fef20d9c 475 if (spec.flags & SIGN) {
7b9186f5 476 if ((signed long long)num < 0) {
1da177e4 477 sign = '-';
7b9186f5 478 num = -(signed long long)num;
1c7a8e62 479 field_width--;
fef20d9c 480 } else if (spec.flags & PLUS) {
1da177e4 481 sign = '+';
1c7a8e62 482 field_width--;
fef20d9c 483 } else if (spec.flags & SPACE) {
1da177e4 484 sign = ' ';
1c7a8e62 485 field_width--;
1da177e4
LT		 486 }
487 }
b39a7340 488 if (need_pfx) {
fef20d9c 489 if (spec.base == 16)
1c7a8e62 490 field_width -= 2;
7c203422 491 else if (!is_zero)
1c7a8e62 492 field_width--;
1da177e4 493 }
b39a7340
DV		 494
495 /* generate full string in tmp[], in reverse order */
1da177e4 496 i = 0;
133fd9f5 497 if (num < spec.base)
3ea8d440 498 tmp[i++] = hex_asc_upper[num] | locase;
fef20d9c
FW		 499 else if (spec.base != 10) { /* 8 or 16 */
500 int mask = spec.base - 1;
b39a7340 501 int shift = 3;
7b9186f5
AGR		 502
503 if (spec.base == 16)
504 shift = 4;
b39a7340 505 do {
3ea8d440 506 tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase);
b39a7340
DV		 507 num >>= shift;
508 } while (num);
4277eedd
DV		 509 } else { /* base 10 */
510 i = put_dec(tmp, num) - tmp;
511 }
b39a7340
DV		 512
513 /* printing 100 using %2d gives "100", not "00" */
1c7a8e62
RV		 514 if (i > precision)
515 precision = i;
b39a7340 516 /* leading space padding */
1c7a8e62 517 field_width -= precision;
51be17df 518 if (!(spec.flags & (ZEROPAD | LEFT))) {
1c7a8e62 519 while (--field_width >= 0) {
f796937a 520 if (buf < end)
1da177e4
LT		 521 *buf = ' ';
522 ++buf;
523 }
524 }
b39a7340 525 /* sign */
1da177e4 526 if (sign) {
f796937a 527 if (buf < end)
1da177e4
LT		 528 *buf = sign;
529 ++buf;
530 }
b39a7340
DV		 531 /* "0x" / "0" prefix */
532 if (need_pfx) {
7c203422
PC		 533 if (spec.base == 16 || !is_zero) {
534 if (buf < end)
535 *buf = '0';
536 ++buf;
537 }
fef20d9c 538 if (spec.base == 16) {
f796937a 539 if (buf < end)
9b706aee 540 *buf = ('X' | locase);
1da177e4
LT		 541 ++buf;
542 }
543 }
b39a7340 544 /* zero or space padding */
fef20d9c 545 if (!(spec.flags & LEFT)) {
d1c1b121 546 char c = ' ' + (spec.flags & ZEROPAD);
b886690d 547
1c7a8e62 548 while (--field_width >= 0) {
f796937a 549 if (buf < end)
1da177e4
LT		 550 *buf = c;
551 ++buf;
552 }
553 }
b39a7340 554 /* hmm even more zero padding? */
1c7a8e62 555 while (i <= --precision) {
f796937a 556 if (buf < end)
1da177e4
LT		 557 *buf = '0';
558 ++buf;
559 }
b39a7340
DV		 560 /* actual digits of result */
561 while (--i >= 0) {
f796937a 562 if (buf < end)
1da177e4
LT		 563 *buf = tmp[i];
564 ++buf;
565 }
b39a7340 566 /* trailing space padding */
1c7a8e62 567 while (--field_width >= 0) {
f796937a 568 if (buf < end)
1da177e4
LT		 569 *buf = ' ';
570 ++buf;
571 }
7b9186f5 572
1da177e4
LT		 573 return buf;
574}
575
3cab1e71
AS		 576static noinline_for_stack
577char *special_hex_number(char *buf, char *end, unsigned long long num, int size)
578{
579 struct printf_spec spec;
580
581 spec.type = FORMAT_TYPE_PTR;
582 spec.field_width = 2 + 2 * size; /* 0x + hex */
583 spec.flags = SPECIAL | SMALL | ZEROPAD;
584 spec.base = 16;
585 spec.precision = -1;
586
587 return number(buf, end, num, spec);
588}
589
cfccde04 590static void move_right(char *buf, char *end, unsigned len, unsigned spaces)
4b6ccca7
AV		 591{
592 size_t size;
593 if (buf >= end) /* nowhere to put anything */
594 return;
595 size = end - buf;
596 if (size <= spaces) {
597 memset(buf, ' ', size);
598 return;
599 }
600 if (len) {
601 if (len > size - spaces)
602 len = size - spaces;
603 memmove(buf + spaces, buf, len);
604 }
605 memset(buf, ' ', spaces);
606}
607
cfccde04
RV		 608/*
609 * Handle field width padding for a string.
610 * @buf: current buffer position
611 * @n: length of string
612 * @end: end of output buffer
613 * @spec: for field width and flags
614 * Returns: new buffer position after padding.
615 */
616static noinline_for_stack
617char *widen_string(char *buf, int n, char *end, struct printf_spec spec)
618{
619 unsigned spaces;
620
621 if (likely(n >= spec.field_width))
622 return buf;
623 /* we want to pad the sucker */
624 spaces = spec.field_width - n;
625 if (!(spec.flags & LEFT)) {
626 move_right(buf - n, end, n, spaces);
627 return buf + spaces;
628 }
629 while (spaces--) {
630 if (buf < end)
631 *buf = ' ';
632 ++buf;
633 }
634 return buf;
635}
636
d529ac41
PM		 637/* Handle string from a well known address. */
638static char *string_nocheck(char *buf, char *end, const char *s,
639 struct printf_spec spec)
95508cfa 640{
34fc8b90 641 int len = 0;
b314dd49 642 int lim = spec.precision;
95508cfa 643
34fc8b90
RV		 644 while (lim--) {
645 char c = *s++;
646 if (!c)
647 break;
95508cfa 648 if (buf < end)
34fc8b90 649 *buf = c;
95508cfa 650 ++buf;
34fc8b90 651 ++len;
95508cfa 652 }
34fc8b90 653 return widen_string(buf, len, end, spec);
95508cfa
RV		 654}
655
57f5677e
RV		 656static char *err_ptr(char *buf, char *end, void *ptr,
657 struct printf_spec spec)
658{
659 int err = PTR_ERR(ptr);
660 const char *sym = errname(err);
661
662 if (sym)
663 return string_nocheck(buf, end, sym, spec);
664
665 /*
666 * Somebody passed ERR_PTR(-1234) or some other non-existing
667 * Efoo - or perhaps CONFIG_SYMBOLIC_ERRNAME=n. Fall back to
668 * printing it as its decimal representation.
669 */
670 spec.flags |= SIGN;
671 spec.base = 10;
672 return number(buf, end, err, spec);
673}
674
c8c3b584
PM		 675/* Be careful: error messages must fit into the given buffer. */
676static char *error_string(char *buf, char *end, const char *s,
677 struct printf_spec spec)
678{
679 /*
680 * Hard limit to avoid a completely insane messages. It actually
681 * works pretty well because most error messages are in
682 * the many pointer format modifiers.
683 */
684 if (spec.precision == -1)
685 spec.precision = 2 * sizeof(void *);
686
687 return string_nocheck(buf, end, s, spec);
688}
689
3e5903eb 690/*
2ac5a3bf
PM		 691 * Do not call any complex external code here. Nested printk()/vsprintf()
692 * might cause infinite loops. Failures might break printk() and would
693 * be hard to debug.
3e5903eb
PM		 694 */
695static const char *check_pointer_msg(const void *ptr)
696{
3e5903eb
PM		 697 if (!ptr)
698 return "(null)";
699
2ac5a3bf 700 if ((unsigned long)ptr < PAGE_SIZE || IS_ERR_VALUE(ptr))
3e5903eb
PM		 701 return "(efault)";
702
703 return NULL;
704}
705
706static int check_pointer(char **buf, char *end, const void *ptr,
707 struct printf_spec spec)
708{
709 const char *err_msg;
710
711 err_msg = check_pointer_msg(ptr);
712 if (err_msg) {
c8c3b584 713 *buf = error_string(*buf, end, err_msg, spec);
3e5903eb
PM		 714 return -EFAULT;
715 }
716
717 return 0;
718}
719
9073dac1 720static noinline_for_stack
d529ac41
PM		 721char *string(char *buf, char *end, const char *s,
722 struct printf_spec spec)
723{
3e5903eb
PM		 724 if (check_pointer(&buf, end, s, spec))
725 return buf;
d529ac41
PM		 726
727 return string_nocheck(buf, end, s, spec);
728}
729
ce9d3ece
Y		 730static char *pointer_string(char *buf, char *end,
731 const void *ptr,
732 struct printf_spec spec)
9073dac1
GU		 733{
734 spec.base = 16;
735 spec.flags |= SMALL;
736 if (spec.field_width == -1) {
737 spec.field_width = 2 * sizeof(ptr);
738 spec.flags |= ZEROPAD;
739 }
740
741 return number(buf, end, (unsigned long int)ptr, spec);
742}
743
744/* Make pointers available for printing early in the boot sequence. */
745static int debug_boot_weak_hash __ro_after_init;
746
747static int __init debug_boot_weak_hash_enable(char *str)
748{
749 debug_boot_weak_hash = 1;
750 pr_info("debug_boot_weak_hash enabled\n");
751 return 0;
752}
753early_param("debug_boot_weak_hash", debug_boot_weak_hash_enable);
754
e4279b59 755static bool filled_random_ptr_key __read_mostly;
6f0ac3b5 756static siphash_key_t ptr_key __read_mostly;
9073dac1 757
898f1e5c 758static int fill_ptr_key(struct notifier_block *nb, unsigned long action, void *data)
9073dac1 759{
6f0ac3b5
SAS		 760 get_random_bytes(&ptr_key, sizeof(ptr_key));
761
762 /* Pairs with smp_rmb() before reading ptr_key. */
763 smp_wmb();
764 WRITE_ONCE(filled_random_ptr_key, true);
898f1e5c 765 return NOTIFY_DONE;
6f0ac3b5
SAS		 766}
767
768static int __init vsprintf_init_hashval(void)
769{
898f1e5c
JD		 770 static struct notifier_block fill_ptr_key_nb = { .notifier_call = fill_ptr_key };
771 execute_with_initialized_rng(&fill_ptr_key_nb);
6f0ac3b5 772 return 0;
9073dac1 773}
6f0ac3b5 774subsys_initcall(vsprintf_init_hashval)
9073dac1 775
9073dac1 776/* Maps a pointer to a 32 bit unique identifier. */
e4dcad20
JFG		 777static inline int __ptr_to_hashval(const void *ptr, unsigned long *hashval_out)
778{
779 unsigned long hashval;
780
6f0ac3b5
SAS		 781 if (!READ_ONCE(filled_random_ptr_key))
782 return -EBUSY;
6701de6c 783
e4279b59
SAS		 784 /* Pairs with smp_wmb() after writing ptr_key. */
785 smp_rmb();
e4dcad20
JFG		 786
787#ifdef CONFIG_64BIT
788 hashval = (unsigned long)siphash_1u64((u64)ptr, &ptr_key);
789 /*
790 * Mask off the first 32 bits, this makes explicit that we have
791 * modified the address (and 32 bits is plenty for a unique ID).
792 */
793 hashval = hashval & 0xffffffff;
794#else
795 hashval = (unsigned long)siphash_1u32((u32)ptr, &ptr_key);
796#endif
797 *hashval_out = hashval;
798 return 0;
799}
800
801int ptr_to_hashval(const void *ptr, unsigned long *hashval_out)
802{
803 return __ptr_to_hashval(ptr, hashval_out);
804}
805
9073dac1
GU		 806static char *ptr_to_id(char *buf, char *end, const void *ptr,
807 struct printf_spec spec)
808{
809 const char *str = sizeof(ptr) == 8 ? "(____ptrval____)" : "(ptrval)";
810 unsigned long hashval;
e4dcad20 811 int ret;
9073dac1 812
7bd57fbc
ID		 813 /*
814 * Print the real pointer value for NULL and error pointers,
815 * as they are not actual addresses.
816 */
817 if (IS_ERR_OR_NULL(ptr))
818 return pointer_string(buf, end, ptr, spec);
819
9073dac1
GU		 820 /* When debugging early boot use non-cryptographically secure hash. */
821 if (unlikely(debug_boot_weak_hash)) {
822 hashval = hash_long((unsigned long)ptr, 32);
823 return pointer_string(buf, end, (const void *)hashval, spec);
824 }
825
e4dcad20
JFG		 826 ret = __ptr_to_hashval(ptr, &hashval);
827 if (ret) {
9073dac1
GU		 828 spec.field_width = 2 * sizeof(ptr);
829 /* string length must be less than default_width */
c8c3b584 830 return error_string(buf, end, str, spec);
9073dac1
GU		 831 }
832
9073dac1
GU		 833 return pointer_string(buf, end, (const void *)hashval, spec);
834}
835
84842911
CL		 836static char *default_pointer(char *buf, char *end, const void *ptr,
837 struct printf_spec spec)
838{
839 /*
840 * default is to _not_ leak addresses, so hash before printing,
841 * unless no_hash_pointers is specified on the command line.
842 */
843 if (unlikely(no_hash_pointers))
844 return pointer_string(buf, end, ptr, spec);
845
846 return ptr_to_id(buf, end, ptr, spec);
847}
848
6eea242f
PM		 849int kptr_restrict __read_mostly;
850
851static noinline_for_stack
852char *restricted_pointer(char *buf, char *end, const void *ptr,
853 struct printf_spec spec)
854{
855 switch (kptr_restrict) {
856 case 0:
1ac2f978 857 /* Handle as %p, hash and do _not_ leak addresses. */
84842911 858 return default_pointer(buf, end, ptr, spec);
6eea242f
PM		 859 case 1: {
860 const struct cred *cred;
861
862 /*
863 * kptr_restrict==1 cannot be used in IRQ context
864 * because its test for CAP_SYSLOG would be meaningless.
865 */
66283a8f 866 if (in_hardirq() || in_serving_softirq() || in_nmi()) {
6eea242f
PM		 867 if (spec.field_width == -1)
868 spec.field_width = 2 * sizeof(ptr);
c8c3b584 869 return error_string(buf, end, "pK-error", spec);
6eea242f
PM		 870 }
871
872 /*
873 * Only print the real pointer value if the current
874 * process has CAP_SYSLOG and is running with the
875 * same credentials it started with. This is because
876 * access to files is checked at open() time, but %pK
877 * checks permission at read() time. We don't want to
878 * leak pointer values if a binary opens a file using
879 * %pK and then elevates privileges before reading it.
880 */
881 cred = current_cred();
882 if (!has_capability_noaudit(current, CAP_SYSLOG) ||
883 !uid_eq(cred->euid, cred->uid) ||
884 !gid_eq(cred->egid, cred->gid))
885 ptr = NULL;
886 break;
887 }
888 case 2:
889 default:
890 /* Always print 0's for %pK */
891 ptr = NULL;
892 break;
893 }
894
895 return pointer_string(buf, end, ptr, spec);
896}
897
4b6ccca7
AV		 898static noinline_for_stack
899char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec,
900 const char *fmt)
901{
902 const char *array[4], *s;
903 const struct dentry *p;
904 int depth;
905 int i, n;
906
907 switch (fmt[1]) {
908 case '2': case '3': case '4':
909 depth = fmt[1] - '0';
910 break;
911 default:
912 depth = 1;
913 }
914
915 rcu_read_lock();
916 for (i = 0; i < depth; i++, d = p) {
3e5903eb
PM		 917 if (check_pointer(&buf, end, d, spec)) {
918 rcu_read_unlock();
919 return buf;
920 }
921
6aa7de05
MR		 922 p = READ_ONCE(d->d_parent);
923 array[i] = READ_ONCE(d->d_name.name);
4b6ccca7
AV		 924 if (p == d) {
925 if (i)
926 array[i] = "";
927 i++;
928 break;
929 }
930 }
931 s = array[--i];
932 for (n = 0; n != spec.precision; n++, buf++) {
933 char c = *s++;
934 if (!c) {
935 if (!i)
936 break;
937 c = '/';
938 s = array[--i];
939 }
940 if (buf < end)
941 *buf = c;
942 }
943 rcu_read_unlock();
cfccde04 944 return widen_string(buf, n, end, spec);
4b6ccca7
AV		 945}
946
36594b31
JH		 947static noinline_for_stack
948char *file_dentry_name(char *buf, char *end, const struct file *f,
949 struct printf_spec spec, const char *fmt)
950{
951 if (check_pointer(&buf, end, f, spec))
952 return buf;
953
954 return dentry_name(buf, end, f->f_path.dentry, spec, fmt);
955}
1031bc58
DM		 956#ifdef CONFIG_BLOCK
957static noinline_for_stack
958char *bdev_name(char *buf, char *end, struct block_device *bdev,
959 struct printf_spec spec, const char *fmt)
960{
3e5903eb
PM		 961 struct gendisk *hd;
962
963 if (check_pointer(&buf, end, bdev, spec))
964 return buf;
965
966 hd = bdev->bd_disk;
1031bc58 967 buf = string(buf, end, hd->disk_name, spec);
700cd59d 968 if (bdev->bd_partno) {
1031bc58
DM		 969 if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) {
970 if (buf < end)
971 *buf = 'p';
972 buf++;
973 }
700cd59d 974 buf = number(buf, end, bdev->bd_partno, spec);
1031bc58
DM		 975 }
976 return buf;
977}
978#endif
979
cf3b429b
JP		 980static noinline_for_stack
981char *symbol_string(char *buf, char *end, void *ptr,
b0d33c2b 982 struct printf_spec spec, const char *fmt)
0fe1ef24 983{
b0d33c2b 984 unsigned long value;
0fe1ef24
LT		 985#ifdef CONFIG_KALLSYMS
986 char sym[KSYM_SYMBOL_LEN];
b0d33c2b
JP		 987#endif
988
989 if (fmt[1] == 'R')
990 ptr = __builtin_extract_return_addr(ptr);
991 value = (unsigned long)ptr;
992
993#ifdef CONFIG_KALLSYMS
9294523e
SB		 994 if (*fmt == 'B' && fmt[1] == 'b')
995 sprint_backtrace_build_id(sym, value);
996 else if (*fmt == 'B')
0f77a8d3 997 sprint_backtrace(sym, value);
9294523e
SB		 998 else if (*fmt == 'S' && (fmt[1] == 'b' || (fmt[1] == 'R' && fmt[2] == 'b')))
999 sprint_symbol_build_id(sym, value);
9af77064 1000 else if (*fmt != 's')
0c8b946e
FW		 1001 sprint_symbol(sym, value);
1002 else
4796dd20 1003 sprint_symbol_no_offset(sym, value);
7b9186f5 1004
d529ac41 1005 return string_nocheck(buf, end, sym, spec);
0fe1ef24 1006#else
3cab1e71 1007 return special_hex_number(buf, end, value, sizeof(void *));
0fe1ef24
LT		 1008#endif
1009}
1010
abd4fe62
AS		 1011static const struct printf_spec default_str_spec = {
1012 .field_width = -1,
1013 .precision = -1,
1014};
1015
54433973
AS		 1016static const struct printf_spec default_flag_spec = {
1017 .base = 16,
1018 .precision = -1,
1019 .flags = SPECIAL | SMALL,
1020};
1021
ce0b4910
AS		 1022static const struct printf_spec default_dec_spec = {
1023 .base = 10,
1024 .precision = -1,
1025};
1026
4d42c447
AS		 1027static const struct printf_spec default_dec02_spec = {
1028 .base = 10,
1029 .field_width = 2,
1030 .precision = -1,
1031 .flags = ZEROPAD,
1032};
1033
1034static const struct printf_spec default_dec04_spec = {
1035 .base = 10,
1036 .field_width = 4,
1037 .precision = -1,
1038 .flags = ZEROPAD,
1039};
1040
cf3b429b
JP		 1041static noinline_for_stack
1042char *resource_string(char *buf, char *end, struct resource *res,
1043 struct printf_spec spec, const char *fmt)
332d2e78
LT		 1044{
1045#ifndef IO_RSRC_PRINTK_SIZE
28405372 1046#define IO_RSRC_PRINTK_SIZE 6
332d2e78
LT		 1047#endif
1048
1049#ifndef MEM_RSRC_PRINTK_SIZE
28405372 1050#define MEM_RSRC_PRINTK_SIZE 10
332d2e78 1051#endif
4da0b66c 1052 static const struct printf_spec io_spec = {
fef20d9c 1053 .base = 16,
4da0b66c 1054 .field_width = IO_RSRC_PRINTK_SIZE,
fef20d9c
FW		 1055 .precision = -1,
1056 .flags = SPECIAL | SMALL | ZEROPAD,
1057 };
4da0b66c
BH		 1058 static const struct printf_spec mem_spec = {
1059 .base = 16,
1060 .field_width = MEM_RSRC_PRINTK_SIZE,
1061 .precision = -1,
1062 .flags = SPECIAL | SMALL | ZEROPAD,
1063 };
0f4050c7
BH		 1064 static const struct printf_spec bus_spec = {
1065 .base = 16,
1066 .field_width = 2,
1067 .precision = -1,
1068 .flags = SMALL | ZEROPAD,
1069 };
4da0b66c 1070 static const struct printf_spec str_spec = {
fd95541e
BH		 1071 .field_width = -1,
1072 .precision = 10,
1073 .flags = LEFT,
1074 };
c7dabef8
BH		 1075
1076 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
1077 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
1078#define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
1079#define FLAG_BUF_SIZE (2 * sizeof(res->flags))
9d7cca04 1080#define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
c7dabef8
BH		 1081#define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
1082 char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
1083 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
1084
332d2e78 1085 char *p = sym, *pend = sym + sizeof(sym);
c7dabef8 1086 int decode = (fmt[0] == 'R') ? 1 : 0;
4da0b66c 1087 const struct printf_spec *specp;
332d2e78 1088
3e5903eb
PM		 1089 if (check_pointer(&buf, end, res, spec))
1090 return buf;
1091
332d2e78 1092 *p++ = '[';
4da0b66c 1093 if (res->flags & IORESOURCE_IO) {
d529ac41 1094 p = string_nocheck(p, pend, "io ", str_spec);
4da0b66c
BH		 1095 specp = &io_spec;
1096 } else if (res->flags & IORESOURCE_MEM) {
d529ac41 1097 p = string_nocheck(p, pend, "mem ", str_spec);
4da0b66c
BH		 1098 specp = &mem_spec;
1099 } else if (res->flags & IORESOURCE_IRQ) {
d529ac41 1100 p = string_nocheck(p, pend, "irq ", str_spec);
ce0b4910 1101 specp = &default_dec_spec;
4da0b66c 1102 } else if (res->flags & IORESOURCE_DMA) {
d529ac41 1103 p = string_nocheck(p, pend, "dma ", str_spec);
ce0b4910 1104 specp = &default_dec_spec;
0f4050c7 1105 } else if (res->flags & IORESOURCE_BUS) {
d529ac41 1106 p = string_nocheck(p, pend, "bus ", str_spec);
0f4050c7 1107 specp = &bus_spec;
4da0b66c 1108 } else {
d529ac41 1109 p = string_nocheck(p, pend, "??? ", str_spec);
4da0b66c 1110 specp = &mem_spec;
c7dabef8 1111 decode = 0;
fd95541e 1112 }
d19cb803 1113 if (decode && res->flags & IORESOURCE_UNSET) {
d529ac41 1114 p = string_nocheck(p, pend, "size ", str_spec);
d19cb803
BH		 1115 p = number(p, pend, resource_size(res), *specp);
1116 } else {
1117 p = number(p, pend, res->start, *specp);
1118 if (res->start != res->end) {
1119 *p++ = '-';
1120 p = number(p, pend, res->end, *specp);
1121 }
c91d3376 1122 }
c7dabef8 1123 if (decode) {
fd95541e 1124 if (res->flags & IORESOURCE_MEM_64)
d529ac41 1125 p = string_nocheck(p, pend, " 64bit", str_spec);
fd95541e 1126 if (res->flags & IORESOURCE_PREFETCH)
d529ac41 1127 p = string_nocheck(p, pend, " pref", str_spec);
9d7cca04 1128 if (res->flags & IORESOURCE_WINDOW)
d529ac41 1129 p = string_nocheck(p, pend, " window", str_spec);
fd95541e 1130 if (res->flags & IORESOURCE_DISABLED)
d529ac41 1131 p = string_nocheck(p, pend, " disabled", str_spec);
c7dabef8 1132 } else {
d529ac41 1133 p = string_nocheck(p, pend, " flags ", str_spec);
54433973 1134 p = number(p, pend, res->flags, default_flag_spec);
fd95541e 1135 }
332d2e78 1136 *p++ = ']';
c7dabef8 1137 *p = '\0';
332d2e78 1138
d529ac41 1139 return string_nocheck(buf, end, sym, spec);
332d2e78
LT		 1140}
1141
31550a16
AS		 1142static noinline_for_stack
1143char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
1144 const char *fmt)
1145{
360603a1 1146 int i, len = 1; /* if we pass '%ph[CDN]', field width remains
31550a16
AS		 1147 negative value, fallback to the default */
1148 char separator;
1149
1150 if (spec.field_width == 0)
1151 /* nothing to print */
1152 return buf;
1153
3e5903eb
PM		 1154 if (check_pointer(&buf, end, addr, spec))
1155 return buf;
31550a16
AS		 1156
1157 switch (fmt[1]) {
1158 case 'C':
1159 separator = ':';
1160 break;
1161 case 'D':
1162 separator = '-';
1163 break;
1164 case 'N':
1165 separator = 0;
1166 break;
1167 default:
1168 separator = ' ';
1169 break;
1170 }
1171
1172 if (spec.field_width > 0)
1173 len = min_t(int, spec.field_width, 64);
1174
9c98f235
RV		 1175 for (i = 0; i < len; ++i) {
1176 if (buf < end)
1177 *buf = hex_asc_hi(addr[i]);
1178 ++buf;
1179 if (buf < end)
1180 *buf = hex_asc_lo(addr[i]);
1181 ++buf;
31550a16 1182
9c98f235
RV		 1183 if (separator && i != len - 1) {
1184 if (buf < end)
1185 *buf = separator;
1186 ++buf;
1187 }
31550a16
AS		 1188 }
1189
1190 return buf;
1191}
1192
dbc760bc 1193static noinline_for_stack
dc453dd8 1194char *bitmap_string(char *buf, char *end, const unsigned long *bitmap,
dbc760bc
TH		 1195 struct printf_spec spec, const char *fmt)
1196{
1197 const int CHUNKSZ = 32;
1198 int nr_bits = max_t(int, spec.field_width, 0);
1199 int i, chunksz;
1200 bool first = true;
1201
3e5903eb
PM		 1202 if (check_pointer(&buf, end, bitmap, spec))
1203 return buf;
1204
dbc760bc
TH		 1205 /* reused to print numbers */
1206 spec = (struct printf_spec){ .flags = SMALL | ZEROPAD, .base = 16 };
1207
1208 chunksz = nr_bits & (CHUNKSZ - 1);
1209 if (chunksz == 0)
1210 chunksz = CHUNKSZ;
1211
1212 i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ;
1213 for (; i >= 0; i -= CHUNKSZ) {
1214 u32 chunkmask, val;
1215 int word, bit;
1216
1217 chunkmask = ((1ULL << chunksz) - 1);
1218 word = i / BITS_PER_LONG;
1219 bit = i % BITS_PER_LONG;
1220 val = (bitmap[word] >> bit) & chunkmask;
1221
1222 if (!first) {
1223 if (buf < end)
1224 *buf = ',';
1225 buf++;
1226 }
1227 first = false;
1228
1229 spec.field_width = DIV_ROUND_UP(chunksz, 4);
1230 buf = number(buf, end, val, spec);
1231
1232 chunksz = CHUNKSZ;
1233 }
1234 return buf;
1235}
1236
1237static noinline_for_stack
dc453dd8 1238char *bitmap_list_string(char *buf, char *end, const unsigned long *bitmap,
dbc760bc
TH		 1239 struct printf_spec spec, const char *fmt)
1240{
1241 int nr_bits = max_t(int, spec.field_width, 0);
dbc760bc 1242 bool first = true;
15325b4f 1243 int rbot, rtop;
dbc760bc 1244
3e5903eb
PM		 1245 if (check_pointer(&buf, end, bitmap, spec))
1246 return buf;
1247
15325b4f 1248 for_each_set_bitrange(rbot, rtop, bitmap, nr_bits) {
dbc760bc
TH		 1249 if (!first) {
1250 if (buf < end)
1251 *buf = ',';
1252 buf++;
1253 }
1254 first = false;
1255
ce0b4910 1256 buf = number(buf, end, rbot, default_dec_spec);
15325b4f
YN		 1257 if (rtop == rbot + 1)
1258 continue;
dbc760bc 1259
15325b4f
YN		 1260 if (buf < end)
1261 *buf = '-';
1262 buf = number(++buf, end, rtop - 1, default_dec_spec);
dbc760bc
TH		 1263 }
1264 return buf;
1265}
1266
cf3b429b
JP		 1267static noinline_for_stack
1268char *mac_address_string(char *buf, char *end, u8 *addr,
1269 struct printf_spec spec, const char *fmt)
dd45c9cf 1270{
8a27f7c9 1271 char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
dd45c9cf
HH		 1272 char *p = mac_addr;
1273 int i;
bc7259a2 1274 char separator;
76597ff9 1275 bool reversed = false;
bc7259a2 1276
3e5903eb
PM		 1277 if (check_pointer(&buf, end, addr, spec))
1278 return buf;
1279
76597ff9
AE		 1280 switch (fmt[1]) {
1281 case 'F':
bc7259a2 1282 separator = '-';
76597ff9
AE		 1283 break;
1284
1285 case 'R':
1286 reversed = true;
4c1ca831 1287 fallthrough;
76597ff9
AE		 1288
1289 default:
bc7259a2 1290 separator = ':';
76597ff9 1291 break;
bc7259a2 1292 }
dd45c9cf
HH		 1293
1294 for (i = 0; i < 6; i++) {
76597ff9
AE		 1295 if (reversed)
1296 p = hex_byte_pack(p, addr[5 - i]);
1297 else
1298 p = hex_byte_pack(p, addr[i]);
1299
8a27f7c9 1300 if (fmt[0] == 'M' && i != 5)
bc7259a2 1301 *p++ = separator;
dd45c9cf
HH		 1302 }
1303 *p = '\0';
1304
d529ac41 1305 return string_nocheck(buf, end, mac_addr, spec);
dd45c9cf
HH		 1306}
1307
cf3b429b
JP		 1308static noinline_for_stack
1309char *ip4_string(char *p, const u8 *addr, const char *fmt)
8a27f7c9
JP		 1310{
1311 int i;
0159f24e
JP		 1312 bool leading_zeros = (fmt[0] == 'i');
1313 int index;
1314 int step;
1315
1316 switch (fmt[2]) {
1317 case 'h':
1318#ifdef __BIG_ENDIAN
1319 index = 0;
1320 step = 1;
1321#else
1322 index = 3;
1323 step = -1;
1324#endif
1325 break;
1326 case 'l':
1327 index = 3;
1328 step = -1;
1329 break;
1330 case 'n':
1331 case 'b':
1332 default:
1333 index = 0;
1334 step = 1;
1335 break;
1336 }
8a27f7c9 1337 for (i = 0; i < 4; i++) {
7c43d9a3 1338 char temp[4] __aligned(2); /* hold each IP quad in reverse order */
133fd9f5 1339 int digits = put_dec_trunc8(temp, addr[index]) - temp;
8a27f7c9
JP		 1340 if (leading_zeros) {
1341 if (digits < 3)
1342 *p++ = '0';
1343 if (digits < 2)
1344 *p++ = '0';
1345 }
1346 /* reverse the digits in the quad */
1347 while (digits--)
1348 *p++ = temp[digits];
1349 if (i < 3)
1350 *p++ = '.';
0159f24e 1351 index += step;
8a27f7c9 1352 }
8a27f7c9 1353 *p = '\0';
7b9186f5 1354
8a27f7c9
JP		 1355 return p;
1356}
1357
cf3b429b
JP		 1358static noinline_for_stack
1359char *ip6_compressed_string(char *p, const char *addr)
689afa7d 1360{
7b9186f5 1361 int i, j, range;
8a27f7c9
JP		 1362 unsigned char zerolength[8];
1363 int longest = 1;
1364 int colonpos = -1;
1365 u16 word;
7b9186f5 1366 u8 hi, lo;
8a27f7c9 1367 bool needcolon = false;
eb78cd26
JP		 1368 bool useIPv4;
1369 struct in6_addr in6;
1370
1371 memcpy(&in6, addr, sizeof(struct in6_addr));
1372
1373 useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
8a27f7c9
JP		 1374
1375 memset(zerolength, 0, sizeof(zerolength));
1376
1377 if (useIPv4)
1378 range = 6;
1379 else
1380 range = 8;
1381
1382 /* find position of longest 0 run */
1383 for (i = 0; i < range; i++) {
1384 for (j = i; j < range; j++) {
eb78cd26 1385 if (in6.s6_addr16[j] != 0)
8a27f7c9
JP		 1386 break;
1387 zerolength[i]++;
1388 }
1389 }
1390 for (i = 0; i < range; i++) {
1391 if (zerolength[i] > longest) {
1392 longest = zerolength[i];
1393 colonpos = i;
1394 }
1395 }
29cf519e
JP		 1396 if (longest == 1) /* don't compress a single 0 */
1397 colonpos = -1;
689afa7d 1398
8a27f7c9
JP		 1399 /* emit address */
1400 for (i = 0; i < range; i++) {
1401 if (i == colonpos) {
1402 if (needcolon || i == 0)
1403 *p++ = ':';
1404 *p++ = ':';
1405 needcolon = false;
1406 i += longest - 1;
1407 continue;
1408 }
1409 if (needcolon) {
1410 *p++ = ':';
1411 needcolon = false;
1412 }
1413 /* hex u16 without leading 0s */
eb78cd26 1414 word = ntohs(in6.s6_addr16[i]);
8a27f7c9
JP		 1415 hi = word >> 8;
1416 lo = word & 0xff;
1417 if (hi) {
1418 if (hi > 0x0f)
55036ba7 1419 p = hex_byte_pack(p, hi);
8a27f7c9
JP		 1420 else
1421 *p++ = hex_asc_lo(hi);
55036ba7 1422 p = hex_byte_pack(p, lo);
8a27f7c9 1423 }
b5ff992b 1424 else if (lo > 0x0f)
55036ba7 1425 p = hex_byte_pack(p, lo);
8a27f7c9
JP		 1426 else
1427 *p++ = hex_asc_lo(lo);
1428 needcolon = true;
1429 }
1430
1431 if (useIPv4) {
1432 if (needcolon)
1433 *p++ = ':';
0159f24e 1434 p = ip4_string(p, &in6.s6_addr[12], "I4");
8a27f7c9 1435 }
8a27f7c9 1436 *p = '\0';
7b9186f5 1437
8a27f7c9
JP		 1438 return p;
1439}
1440
cf3b429b
JP		 1441static noinline_for_stack
1442char *ip6_string(char *p, const char *addr, const char *fmt)
8a27f7c9
JP		 1443{
1444 int i;
7b9186f5 1445
689afa7d 1446 for (i = 0; i < 8; i++) {
55036ba7
AS		 1447 p = hex_byte_pack(p, *addr++);
1448 p = hex_byte_pack(p, *addr++);
8a27f7c9 1449 if (fmt[0] == 'I' && i != 7)
689afa7d
HH		 1450 *p++ = ':';
1451 }
1452 *p = '\0';
7b9186f5 1453
8a27f7c9
JP		 1454 return p;
1455}
1456
cf3b429b
JP		 1457static noinline_for_stack
1458char *ip6_addr_string(char *buf, char *end, const u8 *addr,
1459 struct printf_spec spec, const char *fmt)
8a27f7c9
JP		 1460{
1461 char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
1462
1463 if (fmt[0] == 'I' && fmt[2] == 'c')
eb78cd26 1464 ip6_compressed_string(ip6_addr, addr);
8a27f7c9 1465 else
eb78cd26 1466 ip6_string(ip6_addr, addr, fmt);
689afa7d 1467
d529ac41 1468 return string_nocheck(buf, end, ip6_addr, spec);
689afa7d
HH		 1469}
1470
cf3b429b
JP		 1471static noinline_for_stack
1472char *ip4_addr_string(char *buf, char *end, const u8 *addr,
1473 struct printf_spec spec, const char *fmt)
4aa99606 1474{
8a27f7c9 1475 char ip4_addr[sizeof("255.255.255.255")];
4aa99606 1476
0159f24e 1477 ip4_string(ip4_addr, addr, fmt);
4aa99606 1478
d529ac41 1479 return string_nocheck(buf, end, ip4_addr, spec);
4aa99606
HH		 1480}
1481
10679643
DB		 1482static noinline_for_stack
1483char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa,
1484 struct printf_spec spec, const char *fmt)
1485{
1486 bool have_p = false, have_s = false, have_f = false, have_c = false;
1487 char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") +
1488 sizeof(":12345") + sizeof("/123456789") +
1489 sizeof("%1234567890")];
1490 char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr);
1491 const u8 *addr = (const u8 *) &sa->sin6_addr;
1492 char fmt6[2] = { fmt[0], '6' };
1493 u8 off = 0;
1494
1495 fmt++;
1496 while (isalpha(*++fmt)) {
1497 switch (*fmt) {
1498 case 'p':
1499 have_p = true;
1500 break;
1501 case 'f':
1502 have_f = true;
1503 break;
1504 case 's':
1505 have_s = true;
1506 break;
1507 case 'c':
1508 have_c = true;
1509 break;
1510 }
1511 }
1512
1513 if (have_p || have_s || have_f) {
1514 *p = '[';
1515 off = 1;
1516 }
1517
1518 if (fmt6[0] == 'I' && have_c)
1519 p = ip6_compressed_string(ip6_addr + off, addr);
1520 else
1521 p = ip6_string(ip6_addr + off, addr, fmt6);
1522
1523 if (have_p || have_s || have_f)
1524 *p++ = ']';
1525
1526 if (have_p) {
1527 *p++ = ':';
1528 p = number(p, pend, ntohs(sa->sin6_port), spec);
1529 }
1530 if (have_f) {
1531 *p++ = '/';
1532 p = number(p, pend, ntohl(sa->sin6_flowinfo &
1533 IPV6_FLOWINFO_MASK), spec);
1534 }
1535 if (have_s) {
1536 *p++ = '%';
1537 p = number(p, pend, sa->sin6_scope_id, spec);
1538 }
1539 *p = '\0';
1540
d529ac41 1541 return string_nocheck(buf, end, ip6_addr, spec);
10679643
DB		 1542}
1543
1544static noinline_for_stack
1545char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa,
1546 struct printf_spec spec, const char *fmt)
1547{
1548 bool have_p = false;
1549 char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")];
1550 char *pend = ip4_addr + sizeof(ip4_addr);
1551 const u8 *addr = (const u8 *) &sa->sin_addr.s_addr;
1552 char fmt4[3] = { fmt[0], '4', 0 };
1553
1554 fmt++;
1555 while (isalpha(*++fmt)) {
1556 switch (*fmt) {
1557 case 'p':
1558 have_p = true;
1559 break;
1560 case 'h':
1561 case 'l':
1562 case 'n':
1563 case 'b':
1564 fmt4[2] = *fmt;
1565 break;
1566 }
1567 }
1568
1569 p = ip4_string(ip4_addr, addr, fmt4);
1570 if (have_p) {
1571 *p++ = ':';
1572 p = number(p, pend, ntohs(sa->sin_port), spec);
1573 }
1574 *p = '\0';
1575
d529ac41 1576 return string_nocheck(buf, end, ip4_addr, spec);
10679643
DB		 1577}
1578
f00cc102
PM		 1579static noinline_for_stack
1580char *ip_addr_string(char *buf, char *end, const void *ptr,
1581 struct printf_spec spec, const char *fmt)
1582{
0b74d4d7
PM		 1583 char *err_fmt_msg;
1584
3e5903eb
PM		 1585 if (check_pointer(&buf, end, ptr, spec))
1586 return buf;
1587
f00cc102
PM		 1588 switch (fmt[1]) {
1589 case '6':
1590 return ip6_addr_string(buf, end, ptr, spec, fmt);
1591 case '4':
1592 return ip4_addr_string(buf, end, ptr, spec, fmt);
1593 case 'S': {
1594 const union {
1595 struct sockaddr raw;
1596 struct sockaddr_in v4;
1597 struct sockaddr_in6 v6;
1598 } *sa = ptr;
1599
1600 switch (sa->raw.sa_family) {
1601 case AF_INET:
1602 return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt);
1603 case AF_INET6:
1604 return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt);
1605 default:
c8c3b584 1606 return error_string(buf, end, "(einval)", spec);
f00cc102
PM		 1607 }}
1608 }
1609
0b74d4d7 1610 err_fmt_msg = fmt[0] == 'i' ? "(%pi?)" : "(%pI?)";
c8c3b584 1611 return error_string(buf, end, err_fmt_msg, spec);
f00cc102
PM		 1612}
1613
71dca95d
AS		 1614static noinline_for_stack
1615char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
1616 const char *fmt)
1617{
1618 bool found = true;
1619 int count = 1;
1620 unsigned int flags = 0;
1621 int len;
1622
1623 if (spec.field_width == 0)
1624 return buf; /* nothing to print */
1625
3e5903eb
PM		 1626 if (check_pointer(&buf, end, addr, spec))
1627 return buf;
71dca95d
AS		 1628
1629 do {
1630 switch (fmt[count++]) {
1631 case 'a':
1632 flags |= ESCAPE_ANY;
1633 break;
1634 case 'c':
1635 flags |= ESCAPE_SPECIAL;
1636 break;
1637 case 'h':
1638 flags |= ESCAPE_HEX;
1639 break;
1640 case 'n':
1641 flags |= ESCAPE_NULL;
1642 break;
1643 case 'o':
1644 flags |= ESCAPE_OCTAL;
1645 break;
1646 case 'p':
1647 flags |= ESCAPE_NP;
1648 break;
1649 case 's':
1650 flags |= ESCAPE_SPACE;
1651 break;
1652 default:
1653 found = false;
1654 break;
1655 }
1656 } while (found);
1657
1658 if (!flags)
1659 flags = ESCAPE_ANY_NP;
1660
1661 len = spec.field_width < 0 ? 1 : spec.field_width;
1662
41416f23
RV		 1663 /*
1664 * string_escape_mem() writes as many characters as it can to
1665 * the given buffer, and returns the total size of the output
1666 * had the buffer been big enough.
1667 */
1668 buf += string_escape_mem(addr, len, buf, buf < end ? end - buf : 0, flags, NULL);
71dca95d
AS		 1669
1670 return buf;
1671}
1672
3e5903eb
PM		 1673static char *va_format(char *buf, char *end, struct va_format *va_fmt,
1674 struct printf_spec spec, const char *fmt)
45c3e93d
PM		 1675{
1676 va_list va;
1677
3e5903eb
PM		 1678 if (check_pointer(&buf, end, va_fmt, spec))
1679 return buf;
1680
45c3e93d
PM		 1681 va_copy(va, *va_fmt->va);
1682 buf += vsnprintf(buf, end > buf ? end - buf : 0, va_fmt->fmt, va);
1683 va_end(va);
1684
1685 return buf;
1686}
1687
cf3b429b
JP		 1688static noinline_for_stack
1689char *uuid_string(char *buf, char *end, const u8 *addr,
1690 struct printf_spec spec, const char *fmt)
9ac6e44e 1691{
2b1b0d66 1692 char uuid[UUID_STRING_LEN + 1];
9ac6e44e
JP		 1693 char *p = uuid;
1694 int i;
f9727a17 1695 const u8 *index = uuid_index;
9ac6e44e
JP		 1696 bool uc = false;
1697
3e5903eb
PM		 1698 if (check_pointer(&buf, end, addr, spec))
1699 return buf;
1700
9ac6e44e
JP		 1701 switch (*(++fmt)) {
1702 case 'L':
df561f66 1703 uc = true;
4c1ca831 1704 fallthrough;
9ac6e44e 1705 case 'l':
f9727a17 1706 index = guid_index;
9ac6e44e
JP		 1707 break;
1708 case 'B':
1709 uc = true;
1710 break;
1711 }
1712
1713 for (i = 0; i < 16; i++) {
aa4ea1c3
AS		 1714 if (uc)
1715 p = hex_byte_pack_upper(p, addr[index[i]]);
1716 else
1717 p = hex_byte_pack(p, addr[index[i]]);
9ac6e44e
JP		 1718 switch (i) {
1719 case 3:
1720 case 5:
1721 case 7:
1722 case 9:
1723 *p++ = '-';
1724 break;
1725 }
1726 }
1727
1728 *p = 0;
1729
d529ac41 1730 return string_nocheck(buf, end, uuid, spec);
9ac6e44e
JP		 1731}
1732
5b17aecf 1733static noinline_for_stack
431bca24
GU		 1734char *netdev_bits(char *buf, char *end, const void *addr,
1735 struct printf_spec spec, const char *fmt)
c8f44aff 1736{
5b17aecf
AS		 1737 unsigned long long num;
1738 int size;
1739
3e5903eb
PM		 1740 if (check_pointer(&buf, end, addr, spec))
1741 return buf;
1742
5b17aecf
AS		 1743 switch (fmt[1]) {
1744 case 'F':
1745 num = *(const netdev_features_t *)addr;
1746 size = sizeof(netdev_features_t);
1747 break;
1748 default:
c8c3b584 1749 return error_string(buf, end, "(%pN?)", spec);
5b17aecf 1750 }
c8f44aff 1751
3cab1e71 1752 return special_hex_number(buf, end, num, size);
c8f44aff
MM		 1753}
1754
af612e43
SA		 1755static noinline_for_stack
1756char *fourcc_string(char *buf, char *end, const u32 *fourcc,
1757 struct printf_spec spec, const char *fmt)
1758{
1759 char output[sizeof("0123 little-endian (0x01234567)")];
1760 char *p = output;
1761 unsigned int i;
d75b26f8 1762 u32 orig, val;
af612e43
SA		 1763
1764 if (fmt[1] != 'c' || fmt[2] != 'c')
1765 return error_string(buf, end, "(%p4?)", spec);
1766
1767 if (check_pointer(&buf, end, fourcc, spec))
1768 return buf;
1769
d75b26f8
AS		 1770 orig = get_unaligned(fourcc);
1771 val = orig & ~BIT(31);
af612e43 1772
d75b26f8 1773 for (i = 0; i < sizeof(u32); i++) {
af612e43
SA		 1774 unsigned char c = val >> (i * 8);
1775
1776 /* Print non-control ASCII characters as-is, dot otherwise */
1777 *p++ = isascii(c) && isprint(c) ? c : '.';
1778 }
1779
f74a08fc
AS		 1780 *p++ = ' ';
1781 strcpy(p, orig & BIT(31) ? "big-endian" : "little-endian");
af612e43
SA		 1782 p += strlen(p);
1783
1784 *p++ = ' ';
1785 *p++ = '(';
d75b26f8 1786 p = special_hex_number(p, output + sizeof(output) - 2, orig, sizeof(u32));
af612e43
SA		 1787 *p++ = ')';
1788 *p = '\0';
1789
1790 return string(buf, end, output, spec);
1791}
1792
aaf07621 1793static noinline_for_stack
3e5903eb
PM		 1794char *address_val(char *buf, char *end, const void *addr,
1795 struct printf_spec spec, const char *fmt)
aaf07621
JP		 1796{
1797 unsigned long long num;
3cab1e71 1798 int size;
aaf07621 1799
3e5903eb
PM		 1800 if (check_pointer(&buf, end, addr, spec))
1801 return buf;
1802
aaf07621
JP		 1803 switch (fmt[1]) {
1804 case 'd':
1805 num = *(const dma_addr_t *)addr;
3cab1e71 1806 size = sizeof(dma_addr_t);
aaf07621
JP		 1807 break;
1808 case 'p':
1809 default:
1810 num = *(const phys_addr_t *)addr;
3cab1e71 1811 size = sizeof(phys_addr_t);
aaf07621
JP		 1812 break;
1813 }
1814
3cab1e71 1815 return special_hex_number(buf, end, num, size);
aaf07621
JP		 1816}
1817
4d42c447
AS		 1818static noinline_for_stack
1819char *date_str(char *buf, char *end, const struct rtc_time *tm, bool r)
1820{
1821 int year = tm->tm_year + (r ? 0 : 1900);
1822 int mon = tm->tm_mon + (r ? 0 : 1);
1823
1824 buf = number(buf, end, year, default_dec04_spec);
1825 if (buf < end)
1826 *buf = '-';
1827 buf++;
1828
1829 buf = number(buf, end, mon, default_dec02_spec);
1830 if (buf < end)
1831 *buf = '-';
1832 buf++;
1833
1834 return number(buf, end, tm->tm_mday, default_dec02_spec);
1835}
1836
1837static noinline_for_stack
1838char *time_str(char *buf, char *end, const struct rtc_time *tm, bool r)
1839{
1840 buf = number(buf, end, tm->tm_hour, default_dec02_spec);
1841 if (buf < end)
1842 *buf = ':';
1843 buf++;
1844
1845 buf = number(buf, end, tm->tm_min, default_dec02_spec);
1846 if (buf < end)
1847 *buf = ':';
1848 buf++;
1849
1850 return number(buf, end, tm->tm_sec, default_dec02_spec);
1851}
1852
1853static noinline_for_stack
3e5903eb
PM		 1854char *rtc_str(char *buf, char *end, const struct rtc_time *tm,
1855 struct printf_spec spec, const char *fmt)
4d42c447
AS		 1856{
1857 bool have_t = true, have_d = true;
20bc8c1e
AS		 1858 bool raw = false, iso8601_separator = true;
1859 bool found = true;
4d42c447
AS		 1860 int count = 2;
1861
3e5903eb
PM		 1862 if (check_pointer(&buf, end, tm, spec))
1863 return buf;
1864
4d42c447
AS		 1865 switch (fmt[count]) {
1866 case 'd':
1867 have_t = false;
1868 count++;
1869 break;
1870 case 't':
1871 have_d = false;
1872 count++;
1873 break;
1874 }
1875
20bc8c1e
AS		 1876 do {
1877 switch (fmt[count++]) {
1878 case 'r':
1879 raw = true;
1880 break;
1881 case 's':
1882 iso8601_separator = false;
1883 break;
1884 default:
1885 found = false;
1886 break;
1887 }
1888 } while (found);
4d42c447
AS		 1889
1890 if (have_d)
1891 buf = date_str(buf, end, tm, raw);
1892 if (have_d && have_t) {
4d42c447 1893 if (buf < end)
20bc8c1e 1894 *buf = iso8601_separator ? 'T' : ' ';
4d42c447
AS		 1895 buf++;
1896 }
1897 if (have_t)
1898 buf = time_str(buf, end, tm, raw);
1899
1900 return buf;
1901}
1902
7daac5b2
AS		 1903static noinline_for_stack
1904char *time64_str(char *buf, char *end, const time64_t time,
1905 struct printf_spec spec, const char *fmt)
1906{
1907 struct rtc_time rtc_time;
1908 struct tm tm;
1909
1910 time64_to_tm(time, 0, &tm);
1911
1912 rtc_time.tm_sec = tm.tm_sec;
1913 rtc_time.tm_min = tm.tm_min;
1914 rtc_time.tm_hour = tm.tm_hour;
1915 rtc_time.tm_mday = tm.tm_mday;
1916 rtc_time.tm_mon = tm.tm_mon;
1917 rtc_time.tm_year = tm.tm_year;
1918 rtc_time.tm_wday = tm.tm_wday;
1919 rtc_time.tm_yday = tm.tm_yday;
1920
1921 rtc_time.tm_isdst = 0;
1922
1923 return rtc_str(buf, end, &rtc_time, spec, fmt);
1924}
1925
4d42c447
AS		 1926static noinline_for_stack
1927char *time_and_date(char *buf, char *end, void *ptr, struct printf_spec spec,
1928 const char *fmt)
1929{
1930 switch (fmt[1]) {
1931 case 'R':
3e5903eb 1932 return rtc_str(buf, end, (const struct rtc_time *)ptr, spec, fmt);
7daac5b2
AS		 1933 case 'T':
1934 return time64_str(buf, end, *(const time64_t *)ptr, spec, fmt);
4d42c447 1935 default:
7daac5b2 1936 return error_string(buf, end, "(%pt?)", spec);
4d42c447
AS		 1937 }
1938}
1939
900cca29
GU		 1940static noinline_for_stack
1941char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec,
1942 const char *fmt)
1943{
0b74d4d7 1944 if (!IS_ENABLED(CONFIG_HAVE_CLK))
c8c3b584 1945 return error_string(buf, end, "(%pC?)", spec);
0b74d4d7 1946
3e5903eb
PM		 1947 if (check_pointer(&buf, end, clk, spec))
1948 return buf;
900cca29
GU		 1949
1950 switch (fmt[1]) {
900cca29
GU		 1951 case 'n':
1952 default:
1953#ifdef CONFIG_COMMON_CLK
1954 return string(buf, end, __clk_get_name(clk), spec);
1955#else
4ca96aa9 1956 return ptr_to_id(buf, end, clk, spec);
900cca29
GU		 1957#endif
1958 }
1959}
1960
edf14cdb
VB		 1961static
1962char *format_flags(char *buf, char *end, unsigned long flags,
1963 const struct trace_print_flags *names)
1964{
1965 unsigned long mask;
edf14cdb
VB		 1966
1967 for ( ; flags && names->name; names++) {
1968 mask = names->mask;
1969 if ((flags & mask) != mask)
1970 continue;
1971
abd4fe62 1972 buf = string(buf, end, names->name, default_str_spec);
edf14cdb
VB		 1973
1974 flags &= ~mask;
1975 if (flags) {
1976 if (buf < end)
1977 *buf = '|';
1978 buf++;
1979 }
1980 }
1981
1982 if (flags)
54433973 1983 buf = number(buf, end, flags, default_flag_spec);
edf14cdb
VB		 1984
1985 return buf;
1986}
1987
c244297a
YS		 1988struct page_flags_fields {
1989 int width;
1990 int shift;
1991 int mask;
1992 const struct printf_spec *spec;
1993 const char *name;
1994};
1995
1996static const struct page_flags_fields pff[] = {
1997 {SECTIONS_WIDTH, SECTIONS_PGSHIFT, SECTIONS_MASK,
1998 &default_dec_spec, "section"},
1999 {NODES_WIDTH, NODES_PGSHIFT, NODES_MASK,
2000 &default_dec_spec, "node"},
2001 {ZONES_WIDTH, ZONES_PGSHIFT, ZONES_MASK,
2002 &default_dec_spec, "zone"},
2003 {LAST_CPUPID_WIDTH, LAST_CPUPID_PGSHIFT, LAST_CPUPID_MASK,
2004 &default_flag_spec, "lastcpupid"},
2005 {KASAN_TAG_WIDTH, KASAN_TAG_PGSHIFT, KASAN_TAG_MASK,
2006 &default_flag_spec, "kasantag"},
2007};
2008
2009static
2010char *format_page_flags(char *buf, char *end, unsigned long flags)
2011{
41c961b9 2012 unsigned long main_flags = flags & PAGEFLAGS_MASK;
c244297a
YS		 2013 bool append = false;
2014 int i;
2015
23efd080
MWO		 2016 buf = number(buf, end, flags, default_flag_spec);
2017 if (buf < end)
2018 *buf = '(';
2019 buf++;
2020
c244297a
YS		 2021 /* Page flags from the main area. */
2022 if (main_flags) {
2023 buf = format_flags(buf, end, main_flags, pageflag_names);
2024 append = true;
2025 }
2026
2027 /* Page flags from the fields area */
2028 for (i = 0; i < ARRAY_SIZE(pff); i++) {
2029 /* Skip undefined fields. */
2030 if (!pff[i].width)
2031 continue;
2032
2033 /* Format: Flag Name + '=' (equals sign) + Number + '|' (separator) */
2034 if (append) {
2035 if (buf < end)
2036 *buf = '|';
2037 buf++;
2038 }
2039
2040 buf = string(buf, end, pff[i].name, default_str_spec);
2041 if (buf < end)
2042 *buf = '=';
2043 buf++;
2044 buf = number(buf, end, (flags >> pff[i].shift) & pff[i].mask,
2045 *pff[i].spec);
2046
2047 append = true;
2048 }
23efd080
MWO		 2049 if (buf < end)
2050 *buf = ')';
2051 buf++;
c244297a
YS		 2052
2053 return buf;
2054}
2055
4c85c0be
HY		 2056static
2057char *format_page_type(char *buf, char *end, unsigned int page_type)
2058{
2059 buf = number(buf, end, page_type, default_flag_spec);
2060
2061 if (buf < end)
2062 *buf = '(';
2063 buf++;
2064
2065 if (page_type_has_type(page_type))
2066 buf = format_flags(buf, end, ~page_type, pagetype_names);
2067
2068 if (buf < end)
2069 *buf = ')';
2070 buf++;
2071
2072 return buf;
2073}
2074
edf14cdb 2075static noinline_for_stack
0b74d4d7
PM		 2076char *flags_string(char *buf, char *end, void *flags_ptr,
2077 struct printf_spec spec, const char *fmt)
edf14cdb
VB		 2078{
2079 unsigned long flags;
2080 const struct trace_print_flags *names;
2081
3e5903eb
PM		 2082 if (check_pointer(&buf, end, flags_ptr, spec))
2083 return buf;
2084
edf14cdb
VB		 2085 switch (fmt[1]) {
2086 case 'p':
c244297a 2087 return format_page_flags(buf, end, *(unsigned long *)flags_ptr);
4c85c0be
HY		 2088 case 't':
2089 return format_page_type(buf, end, *(unsigned int *)flags_ptr);
edf14cdb
VB		 2090 case 'v':
2091 flags = *(unsigned long *)flags_ptr;
2092 names = vmaflag_names;
2093 break;
2094 case 'g':
30d497a0 2095 flags = (__force unsigned long)(*(gfp_t *)flags_ptr);
edf14cdb
VB		 2096 names = gfpflag_names;
2097 break;
2098 default:
c8c3b584 2099 return error_string(buf, end, "(%pG?)", spec);
edf14cdb
VB		 2100 }
2101
2102 return format_flags(buf, end, flags, names);
2103}
2104
ce4fecf1 2105static noinline_for_stack
a92eb762
SA		 2106char *fwnode_full_name_string(struct fwnode_handle *fwnode, char *buf,
2107 char *end)
ce4fecf1
PA		 2108{
2109 int depth;
ce4fecf1 2110
a92eb762
SA		 2111 /* Loop starting from the root node to the current node. */
2112 for (depth = fwnode_count_parents(fwnode); depth >= 0; depth--) {
2113 struct fwnode_handle *__fwnode =
2114 fwnode_get_nth_parent(fwnode, depth);
ce4fecf1 2115
a92eb762 2116 buf = string(buf, end, fwnode_get_name_prefix(__fwnode),
abd4fe62 2117 default_str_spec);
a92eb762 2118 buf = string(buf, end, fwnode_get_name(__fwnode),
abd4fe62 2119 default_str_spec);
a92eb762
SA		 2120
2121 fwnode_handle_put(__fwnode);
ce4fecf1 2122 }
a92eb762 2123
ce4fecf1
PA		 2124 return buf;
2125}
2126
2127static noinline_for_stack
2128char *device_node_string(char *buf, char *end, struct device_node *dn,
2129 struct printf_spec spec, const char *fmt)
2130{
2131 char tbuf[sizeof("xxxx") + 1];
2132 const char *p;
2133 int ret;
2134 char *buf_start = buf;
2135 struct property *prop;
2136 bool has_mult, pass;
ce4fecf1
PA		 2137
2138 struct printf_spec str_spec = spec;
2139 str_spec.field_width = -1;
2140
83abc5a7
SA		 2141 if (fmt[0] != 'F')
2142 return error_string(buf, end, "(%pO?)", spec);
2143
ce4fecf1 2144 if (!IS_ENABLED(CONFIG_OF))
c8c3b584 2145 return error_string(buf, end, "(%pOF?)", spec);
ce4fecf1 2146
3e5903eb
PM		 2147 if (check_pointer(&buf, end, dn, spec))
2148 return buf;
ce4fecf1
PA		 2149
2150 /* simple case without anything any more format specifiers */
2151 fmt++;
2152 if (fmt[0] == '\0' || strcspn(fmt,"fnpPFcC") > 0)
2153 fmt = "f";
2154
2155 for (pass = false; strspn(fmt,"fnpPFcC"); fmt++, pass = true) {
6d0a70a2 2156 int precision;
ce4fecf1
PA		 2157 if (pass) {
2158 if (buf < end)
2159 *buf = ':';
2160 buf++;
2161 }
2162
2163 switch (*fmt) {
2164 case 'f': /* full_name */
a92eb762
SA		 2165 buf = fwnode_full_name_string(of_fwnode_handle(dn), buf,
2166 end);
ce4fecf1
PA		 2167 break;
2168 case 'n': /* name */
a92eb762 2169 p = fwnode_get_name(of_fwnode_handle(dn));
6d0a70a2
RH		 2170 precision = str_spec.precision;
2171 str_spec.precision = strchrnul(p, '@') - p;
2172 buf = string(buf, end, p, str_spec);
2173 str_spec.precision = precision;
ce4fecf1
PA		 2174 break;
2175 case 'p': /* phandle */
09ceb8d7 2176 buf = number(buf, end, (unsigned int)dn->phandle, default_dec_spec);
ce4fecf1
PA		 2177 break;
2178 case 'P': /* path-spec */
a92eb762 2179 p = fwnode_get_name(of_fwnode_handle(dn));
ce4fecf1
PA		 2180 if (!p[1])
2181 p = "/";
2182 buf = string(buf, end, p, str_spec);
2183 break;
2184 case 'F': /* flags */
2185 tbuf[0] = of_node_check_flag(dn, OF_DYNAMIC) ? 'D' : '-';
2186 tbuf[1] = of_node_check_flag(dn, OF_DETACHED) ? 'd' : '-';
2187 tbuf[2] = of_node_check_flag(dn, OF_POPULATED) ? 'P' : '-';
2188 tbuf[3] = of_node_check_flag(dn, OF_POPULATED_BUS) ? 'B' : '-';
2189 tbuf[4] = 0;
d529ac41 2190 buf = string_nocheck(buf, end, tbuf, str_spec);
ce4fecf1
PA		 2191 break;
2192 case 'c': /* major compatible string */
2193 ret = of_property_read_string(dn, "compatible", &p);
2194 if (!ret)
2195 buf = string(buf, end, p, str_spec);
2196 break;
2197 case 'C': /* full compatible string */
2198 has_mult = false;
2199 of_property_for_each_string(dn, "compatible", prop, p) {
2200 if (has_mult)
d529ac41
PM		 2201 buf = string_nocheck(buf, end, ",", str_spec);
2202 buf = string_nocheck(buf, end, "\"", str_spec);
ce4fecf1 2203 buf = string(buf, end, p, str_spec);
d529ac41 2204 buf = string_nocheck(buf, end, "\"", str_spec);
ce4fecf1
PA		 2205
2206 has_mult = true;
2207 }
2208 break;
2209 default:
2210 break;
2211 }
2212 }
2213
2214 return widen_string(buf, buf - buf_start, end, spec);
2215}
2216
3bd32d6a
SA		 2217static noinline_for_stack
2218char *fwnode_string(char *buf, char *end, struct fwnode_handle *fwnode,
2219 struct printf_spec spec, const char *fmt)
798cc27a 2220{
3bd32d6a
SA		 2221 struct printf_spec str_spec = spec;
2222 char *buf_start = buf;
2223
2224 str_spec.field_width = -1;
2225
2226 if (*fmt != 'w')
2227 return error_string(buf, end, "(%pf?)", spec);
2228
2229 if (check_pointer(&buf, end, fwnode, spec))
2230 return buf;
2231
2232 fmt++;
2233
2234 switch (*fmt) {
2235 case 'P': /* name */
2236 buf = string(buf, end, fwnode_get_name(fwnode), str_spec);
2237 break;
2238 case 'f': /* full_name */
2239 default:
2240 buf = fwnode_full_name_string(fwnode, buf, end);
2241 break;
798cc27a
PM		 2242 }
2243
3bd32d6a 2244 return widen_string(buf, buf - buf_start, end, spec);
798cc27a
PM		 2245}
2246
79270291 2247int __init no_hash_pointers_enable(char *str)
5ead723a 2248{
9f961c2e
ME		 2249 if (no_hash_pointers)
2250 return 0;
2251
5ead723a
TT		 2252 no_hash_pointers = true;
2253
2254 pr_warn("**********************************************************\n");
2255 pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n");
2256 pr_warn("** **\n");
2257 pr_warn("** This system shows unhashed kernel memory addresses **\n");
2258 pr_warn("** via the console, logs, and other interfaces. This **\n");
2259 pr_warn("** might reduce the security of your system. **\n");
2260 pr_warn("** **\n");
2261 pr_warn("** If you see this message and you are not debugging **\n");
2262 pr_warn("** the kernel, report this immediately to your system **\n");
2263 pr_warn("** administrator! **\n");
2264 pr_warn("** **\n");
2265 pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n");
2266 pr_warn("**********************************************************\n");
2267
2268 return 0;
2269}
2270early_param("no_hash_pointers", no_hash_pointers_enable);
2271
787983da
GG		 2272/* Used for Rust formatting ('%pA'). */
2273char *rust_fmt_argument(char *buf, char *end, void *ptr);
2274
4d8a743c
LT		 2275/*
2276 * Show a '%p' thing. A kernel extension is that the '%p' is followed
2277 * by an extra set of alphanumeric characters that are extended format
2278 * specifiers.
2279 *
0b523769
JP		 2280 * Please update scripts/checkpatch.pl when adding/removing conversion
2281 * characters. (Search for "check for vsprintf extension").
2282 *
332d2e78
LT		 2283 * Right now we handle:
2284 *
cdb7e52d
SS		 2285 * - 'S' For symbolic direct pointers (or function descriptors) with offset
2286 * - 's' For symbolic direct pointers (or function descriptors) without offset
9af77064 2287 * - '[Ss]R' as above with __builtin_extract_return_addr() translation
9294523e 2288 * - 'S[R]b' as above with module build ID (for use in backtraces)
1586c5ae
SA		 2289 * - '[Ff]' %pf and %pF were obsoleted and later removed in favor of
2290 * %ps and %pS. Be careful when re-using these specifiers.
0f77a8d3 2291 * - 'B' For backtraced symbolic direct pointers with offset
9294523e 2292 * - 'Bb' as above with module build ID (for use in backtraces)
c7dabef8
BH		 2293 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
2294 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
dbc760bc
TH		 2295 * - 'b[l]' For a bitmap, the number of bits is determined by the field
2296 * width which must be explicitly specified either as part of the
2297 * format string '%32b[l]' or through '%*b[l]', [l] selects
2298 * range-list format instead of hex format
dd45c9cf
HH		 2299 * - 'M' For a 6-byte MAC address, it prints the address in the
2300 * usual colon-separated hex notation
8a27f7c9 2301 * - 'm' For a 6-byte MAC address, it prints the hex address without colons
bc7259a2 2302 * - 'MF' For a 6-byte MAC FDDI address, it prints the address
c8e00060 2303 * with a dash-separated hex notation
7c59154e 2304 * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth)
8a27f7c9
JP		 2305 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
2306 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
2307 * IPv6 uses colon separated network-order 16 bit hex with leading 0's
10679643
DB		 2308 * [S][pfs]
2309 * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
2310 * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
8a27f7c9
JP		 2311 * - 'i' [46] for 'raw' IPv4/IPv6 addresses
2312 * IPv6 omits the colons (01020304...0f)
2313 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
10679643
DB		 2314 * [S][pfs]
2315 * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
2316 * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
2317 * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order
2318 * - 'I[6S]c' for IPv6 addresses printed as specified by
8eda94bd 2319 * https://tools.ietf.org/html/rfc5952
71dca95d
AS		 2320 * - 'E[achnops]' For an escaped buffer, where rules are defined by combination
2321 * of the following flags (see string_escape_mem() for the
2322 * details):
2323 * a - ESCAPE_ANY
2324 * c - ESCAPE_SPECIAL
2325 * h - ESCAPE_HEX
2326 * n - ESCAPE_NULL
2327 * o - ESCAPE_OCTAL
2328 * p - ESCAPE_NP
2329 * s - ESCAPE_SPACE
2330 * By default ESCAPE_ANY_NP is used.
9ac6e44e
JP		 2331 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
2332 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
2333 * Options for %pU are:
2334 * b big endian lower case hex (default)
2335 * B big endian UPPER case hex
2336 * l little endian lower case hex
2337 * L little endian UPPER case hex
2338 * big endian output byte order is:
2339 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
2340 * little endian output byte order is:
2341 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
7db6f5fb
JP		 2342 * - 'V' For a struct va_format which contains a format string * and va_list *,
2343 * call vsnprintf(->format, *->va_list).
2344 * Implements a "recursive vsnprintf".
2345 * Do not use this feature without some mechanism to verify the
2346 * correctness of the format string and va_list arguments.
a48849e2
VB		 2347 * - 'K' For a kernel pointer that should be hidden from unprivileged users.
2348 * Use only for procfs, sysfs and similar files, not printk(); please
2349 * read the documentation (path below) first.
c8f44aff 2350 * - 'NF' For a netdev_features_t
af612e43 2351 * - '4cc' V4L2 or DRM FourCC code, with endianness and raw numerical value.
31550a16
AS		 2352 * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with
2353 * a certain separator (' ' by default):
2354 * C colon
2355 * D dash
2356 * N no separator
2357 * The maximum supported length is 64 bytes of the input. Consider
2358 * to use print_hex_dump() for the larger input.
aaf07621
JP		 2359 * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives
2360 * (default assumed to be phys_addr_t, passed by reference)
c0d92a57
OJ		 2361 * - 'd[234]' For a dentry name (optionally 2-4 last components)
2362 * - 'D[234]' Same as 'd' but for a struct file
1031bc58 2363 * - 'g' For block_device name (gendisk + partition number)
20bc8c1e 2364 * - 't[RT][dt][r][s]' For time and date as represented by:
4d42c447 2365 * R struct rtc_time
7daac5b2 2366 * T time64_t
900cca29
GU		 2367 * - 'C' For a clock, it prints the name (Common Clock Framework) or address
2368 * (legacy clock framework) of the clock
2369 * - 'Cn' For a clock, it prints the name (Common Clock Framework) or address
2370 * (legacy clock framework) of the clock
edf14cdb
VB		 2371 * - 'G' For flags to be printed as a collection of symbolic strings that would
2372 * construct the specific value. Supported flags given by option:
2373 * p page flags (see struct page) given as pointer to unsigned long
2374 * g gfp flags (GFP_* and __GFP_*) given as pointer to gfp_t
2375 * v vma flags (VM_*) given as pointer to unsigned long
94ac8f20
GU		 2376 * - 'OF[fnpPcCF]' For a device tree object
2377 * Without any optional arguments prints the full_name
2378 * f device node full_name
2379 * n device node name
2380 * p device node phandle
2381 * P device node path spec (name + @unit)
2382 * F device node flags
2383 * c major compatible string
2384 * C full compatible string
3bd32d6a
SA		 2385 * - 'fw[fP]' For a firmware node (struct fwnode_handle) pointer
2386 * Without an option prints the full name of the node
2387 * f full name
2388 * P node name, including a possible unit address
a48849e2
VB		 2389 * - 'x' For printing the address unmodified. Equivalent to "%lx".
2390 * Please read the documentation (path below) before using!
b2a5212f
DB		 2391 * - '[ku]s' For a BPF/tracing related format specifier, e.g. used out of
2392 * bpf_trace_printk() where [ku] prefix specifies either kernel (k)
2393 * or user (u) memory to probe, and:
2394 * s a string, equivalent to "%s" on direct vsnprintf() use
7b1924a1 2395 *
b3ed2321
TH		 2396 * ** When making changes please also update:
2397 * Documentation/core-api/printk-formats.rst
9ac6e44e 2398 *
ad67b74d
TH		 2399 * Note: The default behaviour (unadorned %p) is to hash the address,
2400 * rendering it useful as a unique identifier.
787983da
GG		 2401 *
2402 * There is also a '%pA' format specifier, but it is only intended to be used
2403 * from Rust code to format core::fmt::Arguments. Do *not* use it from C.
2404 * See rust/kernel/print.rs for details.
4d8a743c 2405 */
cf3b429b
JP		 2406static noinline_for_stack
2407char *pointer(const char *fmt, char *buf, char *end, void *ptr,
2408 struct printf_spec spec)
78a8bf69 2409{
0fe1ef24 2410 switch (*fmt) {
0fe1ef24 2411 case 'S':
9ac6e44e 2412 case 's':
04b8eb7a 2413 ptr = dereference_symbol_descriptor(ptr);
4c1ca831 2414 fallthrough;
0f77a8d3 2415 case 'B':
b0d33c2b 2416 return symbol_string(buf, end, ptr, spec, fmt);
332d2e78 2417 case 'R':
c7dabef8 2418 case 'r':
fd95541e 2419 return resource_string(buf, end, ptr, spec, fmt);
31550a16
AS		 2420 case 'h':
2421 return hex_string(buf, end, ptr, spec, fmt);
dbc760bc
TH		 2422 case 'b':
2423 switch (fmt[1]) {
2424 case 'l':
2425 return bitmap_list_string(buf, end, ptr, spec, fmt);
2426 default:
2427 return bitmap_string(buf, end, ptr, spec, fmt);
2428 }
8a27f7c9
JP		 2429 case 'M': /* Colon separated: 00:01:02:03:04:05 */
2430 case 'm': /* Contiguous: 000102030405 */
76597ff9
AE		 2431 /* [mM]F (FDDI) */
2432 /* [mM]R (Reverse order; Bluetooth) */
8a27f7c9
JP		 2433 return mac_address_string(buf, end, ptr, spec, fmt);
2434 case 'I': /* Formatted IP supported
2435 * 4: 1.2.3.4
2436 * 6: 0001:0203:...:0708
2437 * 6c: 1::708 or 1::1.2.3.4
2438 */
2439 case 'i': /* Contiguous:
2440 * 4: 001.002.003.004
2441 * 6: 000102...0f
2442 */
f00cc102 2443 return ip_addr_string(buf, end, ptr, spec, fmt);
71dca95d
AS		 2444 case 'E':
2445 return escaped_string(buf, end, ptr, spec, fmt);
9ac6e44e
JP		 2446 case 'U':
2447 return uuid_string(buf, end, ptr, spec, fmt);
7db6f5fb 2448 case 'V':
3e5903eb 2449 return va_format(buf, end, ptr, spec, fmt);
455cd5ab 2450 case 'K':
57e73442 2451 return restricted_pointer(buf, end, ptr, spec);
c8f44aff 2452 case 'N':
431bca24 2453 return netdev_bits(buf, end, ptr, spec, fmt);
af612e43
SA		 2454 case '4':
2455 return fourcc_string(buf, end, ptr, spec, fmt);
7d799210 2456 case 'a':
3e5903eb 2457 return address_val(buf, end, ptr, spec, fmt);
4b6ccca7
AV		 2458 case 'd':
2459 return dentry_name(buf, end, ptr, spec, fmt);
4d42c447
AS		 2460 case 't':
2461 return time_and_date(buf, end, ptr, spec, fmt);
900cca29
GU		 2462 case 'C':
2463 return clock(buf, end, ptr, spec, fmt);
4b6ccca7 2464 case 'D':
36594b31 2465 return file_dentry_name(buf, end, ptr, spec, fmt);
1031bc58
DM		 2466#ifdef CONFIG_BLOCK
2467 case 'g':
2468 return bdev_name(buf, end, ptr, spec, fmt);
2469#endif
2470
edf14cdb 2471 case 'G':
0b74d4d7 2472 return flags_string(buf, end, ptr, spec, fmt);
ce4fecf1 2473 case 'O':
83abc5a7 2474 return device_node_string(buf, end, ptr, spec, fmt + 1);
3bd32d6a
SA		 2475 case 'f':
2476 return fwnode_string(buf, end, ptr, spec, fmt + 1);
787983da
GG		 2477 case 'A':
2478 if (!IS_ENABLED(CONFIG_RUST)) {
2479 WARN_ONCE(1, "Please remove %%pA from non-Rust code\n");
2480 return error_string(buf, end, "(%pA?)", spec);
2481 }
2482 return rust_fmt_argument(buf, end, ptr);
7b1924a1
TH		 2483 case 'x':
2484 return pointer_string(buf, end, ptr, spec);
57f5677e
RV		 2485 case 'e':
2486 /* %pe with a non-ERR_PTR gets treated as plain %p */
2487 if (!IS_ERR(ptr))
84842911 2488 return default_pointer(buf, end, ptr, spec);
57f5677e 2489 return err_ptr(buf, end, ptr, spec);
b2a5212f
DB		 2490 case 'u':
2491 case 'k':
2492 switch (fmt[1]) {
2493 case 's':
2494 return string(buf, end, ptr, spec);
2495 default:
2496 return error_string(buf, end, "(einval)", spec);
2497 }
84842911
CL		 2498 default:
2499 return default_pointer(buf, end, ptr, spec);
fef20d9c 2500 }
fef20d9c
FW		 2501}
2502
2503/*
2504 * Helper function to decode printf style format.
2505 * Each call decode a token from the format and return the
2506 * number of characters read (or likely the delta where it wants
2507 * to go on the next call).
2508 * The decoded token is returned through the parameters
2509 *
2510 * 'h', 'l', or 'L' for integer fields
2511 * 'z' support added 23/7/1999 S.H.
2512 * 'z' changed to 'Z' --davidm 1/25/99
5b5e0928 2513 * 'Z' changed to 'z' --adobriyan 2017-01-25
fef20d9c
FW		 2514 * 't' added for ptrdiff_t
2515 *
2516 * @fmt: the format string
2517 * @type of the token returned
2518 * @flags: various flags such as +, -, # tokens..
2519 * @field_width: overwritten width
2520 * @base: base of the number (octal, hex, ...)
2521 * @precision: precision of a number
2522 * @qualifier: qualifier of a number (long, size_t, ...)
2523 */
cf3b429b
JP		 2524static noinline_for_stack
2525int format_decode(const char *fmt, struct printf_spec *spec)
fef20d9c
FW		 2526{
2527 const char *start = fmt;
d0484193 2528 char qualifier;
fef20d9c
FW		 2529
2530 /* we finished early by reading the field width */
ed681a91 2531 if (spec->type == FORMAT_TYPE_WIDTH) {
fef20d9c
FW		 2532 if (spec->field_width < 0) {
2533 spec->field_width = -spec->field_width;
2534 spec->flags |= LEFT;
2535 }
2536 spec->type = FORMAT_TYPE_NONE;
2537 goto precision;
2538 }
2539
2540 /* we finished early by reading the precision */
2541 if (spec->type == FORMAT_TYPE_PRECISION) {
2542 if (spec->precision < 0)
2543 spec->precision = 0;
2544
2545 spec->type = FORMAT_TYPE_NONE;
2546 goto qualifier;
2547 }
2548
2549 /* By default */
2550 spec->type = FORMAT_TYPE_NONE;
2551
2552 for (; *fmt ; ++fmt) {
2553 if (*fmt == '%')
2554 break;
2555 }
2556
2557 /* Return the current non-format string */
2558 if (fmt != start || !*fmt)
2559 return fmt - start;
2560
2561 /* Process flags */
2562 spec->flags = 0;
2563
2564 while (1) { /* this also skips first '%' */
2565 bool found = true;
2566
2567 ++fmt;
2568
2569 switch (*fmt) {
2570 case '-': spec->flags |= LEFT; break;
2571 case '+': spec->flags |= PLUS; break;
2572 case ' ': spec->flags |= SPACE; break;
2573 case '#': spec->flags |= SPECIAL; break;
2574 case '0': spec->flags |= ZEROPAD; break;
2575 default: found = false;
2576 }
2577
2578 if (!found)
2579 break;
2580 }
2581
2582 /* get field width */
2583 spec->field_width = -1;
2584
2585 if (isdigit(*fmt))
2586 spec->field_width = skip_atoi(&fmt);
2587 else if (*fmt == '*') {
2588 /* it's the next argument */
ed681a91 2589 spec->type = FORMAT_TYPE_WIDTH;
fef20d9c
FW		 2590 return ++fmt - start;
2591 }
2592
2593precision:
2594 /* get the precision */
2595 spec->precision = -1;
2596 if (*fmt == '.') {
2597 ++fmt;
2598 if (isdigit(*fmt)) {
2599 spec->precision = skip_atoi(&fmt);
2600 if (spec->precision < 0)
2601 spec->precision = 0;
2602 } else if (*fmt == '*') {
2603 /* it's the next argument */
adf26f84 2604 spec->type = FORMAT_TYPE_PRECISION;
fef20d9c
FW		 2605 return ++fmt - start;
2606 }
2607 }
2608
2609qualifier:
2610 /* get the conversion qualifier */
d0484193 2611 qualifier = 0;
75fb8f26 2612 if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
5b5e0928 2613 *fmt == 'z' || *fmt == 't') {
d0484193
RV		 2614 qualifier = *fmt++;
2615 if (unlikely(qualifier == *fmt)) {
2616 if (qualifier == 'l') {
2617 qualifier = 'L';
a4e94ef0 2618 ++fmt;
d0484193
RV		 2619 } else if (qualifier == 'h') {
2620 qualifier = 'H';
a4e94ef0
Z		 2621 ++fmt;
2622 }
fef20d9c
FW		 2623 }
2624 }
2625
2626 /* default base */
2627 spec->base = 10;
2628 switch (*fmt) {
2629 case 'c':
2630 spec->type = FORMAT_TYPE_CHAR;
2631 return ++fmt - start;
2632
2633 case 's':
2634 spec->type = FORMAT_TYPE_STR;
2635 return ++fmt - start;
2636
2637 case 'p':
2638 spec->type = FORMAT_TYPE_PTR;
ffbfed03 2639 return ++fmt - start;
fef20d9c 2640
fef20d9c
FW		 2641 case '%':
2642 spec->type = FORMAT_TYPE_PERCENT_CHAR;
2643 return ++fmt - start;
2644
2645 /* integer number formats - set up the flags and "break" */
2646 case 'o':
2647 spec->base = 8;
2648 break;
2649
2650 case 'x':
2651 spec->flags |= SMALL;
4c1ca831 2652 fallthrough;
fef20d9c
FW		 2653
2654 case 'X':
2655 spec->base = 16;
2656 break;
2657
2658 case 'd':
2659 case 'i':
39e874f8 2660 spec->flags |= SIGN;
36f9ff9e 2661 break;
fef20d9c 2662 case 'u':
4aa99606 2663 break;
fef20d9c 2664
708d96fd
RM		 2665 case 'n':
2666 /*
b006f19b
RV		 2667 * Since %n poses a greater security risk than
2668 * utility, treat it as any other invalid or
2669 * unsupported format specifier.
708d96fd 2670 */
4c1ca831 2671 fallthrough;
708d96fd 2672
fef20d9c 2673 default:
b006f19b 2674 WARN_ONCE(1, "Please remove unsupported %%%c in format string\n", *fmt);
fef20d9c
FW		 2675 spec->type = FORMAT_TYPE_INVALID;
2676 return fmt - start;
0fe1ef24 2677 }
fef20d9c 2678
d0484193 2679 if (qualifier == 'L')
fef20d9c 2680 spec->type = FORMAT_TYPE_LONG_LONG;
d0484193 2681 else if (qualifier == 'l') {
51be17df
RV		 2682 BUILD_BUG_ON(FORMAT_TYPE_ULONG + SIGN != FORMAT_TYPE_LONG);
2683 spec->type = FORMAT_TYPE_ULONG + (spec->flags & SIGN);
5b5e0928 2684 } else if (qualifier == 'z') {
fef20d9c 2685 spec->type = FORMAT_TYPE_SIZE_T;
d0484193 2686 } else if (qualifier == 't') {
fef20d9c 2687 spec->type = FORMAT_TYPE_PTRDIFF;
d0484193 2688 } else if (qualifier == 'H') {
51be17df
RV		 2689 BUILD_BUG_ON(FORMAT_TYPE_UBYTE + SIGN != FORMAT_TYPE_BYTE);
2690 spec->type = FORMAT_TYPE_UBYTE + (spec->flags & SIGN);
d0484193 2691 } else if (qualifier == 'h') {
51be17df
RV		 2692 BUILD_BUG_ON(FORMAT_TYPE_USHORT + SIGN != FORMAT_TYPE_SHORT);
2693 spec->type = FORMAT_TYPE_USHORT + (spec->flags & SIGN);
fef20d9c 2694 } else {
51be17df
RV		 2695 BUILD_BUG_ON(FORMAT_TYPE_UINT + SIGN != FORMAT_TYPE_INT);
2696 spec->type = FORMAT_TYPE_UINT + (spec->flags & SIGN);
78a8bf69 2697 }
fef20d9c
FW		 2698
2699 return ++fmt - start;
78a8bf69
LT		 2700}
2701
4d72ba01
RV		 2702static void
2703set_field_width(struct printf_spec *spec, int width)
2704{
2705 spec->field_width = width;
2706 if (WARN_ONCE(spec->field_width != width, "field width %d too large", width)) {
2707 spec->field_width = clamp(width, -FIELD_WIDTH_MAX, FIELD_WIDTH_MAX);
2708 }
2709}
2710
2711static void
2712set_precision(struct printf_spec *spec, int prec)
2713{
2714 spec->precision = prec;
2715 if (WARN_ONCE(spec->precision != prec, "precision %d too large", prec)) {
2716 spec->precision = clamp(prec, 0, PRECISION_MAX);
2717 }
2718}
2719
1da177e4
LT		 2720/**
2721 * vsnprintf - Format a string and place it in a buffer
2722 * @buf: The buffer to place the result into
2723 * @size: The size of the buffer, including the trailing null space
2724 * @fmt: The format string to use
2725 * @args: Arguments for the format string
2726 *
d7ec9a05
RV		 2727 * This function generally follows C99 vsnprintf, but has some
2728 * extensions and a few limitations:
2729 *
6cc89134
MCC		 2730 * - ``%n`` is unsupported
2731 * - ``%p*`` is handled by pointer()
5e4ee7b1 2732 *
27e7c0e8 2733 * See pointer() or Documentation/core-api/printk-formats.rst for more
5e4ee7b1 2734 * extensive description.
20036fdc 2735 *
6cc89134 2736 * **Please update the documentation in both places when making changes**
80f548e0 2737 *
1da177e4
LT		 2738 * The return value is the number of characters which would
2739 * be generated for the given input, excluding the trailing
2740 * '\0', as per ISO C99. If you want to have the exact
2741 * number of characters written into @buf as return value
72fd4a35 2742 * (not including the trailing '\0'), use vscnprintf(). If the
1da177e4
LT		 2743 * return is greater than or equal to @size, the resulting
2744 * string is truncated.
2745 *
ba1835eb 2746 * If you're not already dealing with a va_list consider using snprintf().
1da177e4
LT		 2747 */
2748int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
2749{
1da177e4 2750 unsigned long long num;
d4be151b 2751 char *str, *end;
fef20d9c 2752 struct printf_spec spec = {0};
1da177e4 2753
f796937a
JF		 2754 /* Reject out-of-range values early. Large positive sizes are
2755 used for unknown buffer sizes. */
2aa2f9e2 2756 if (WARN_ON_ONCE(size > INT_MAX))
1da177e4 2757 return 0;
1da177e4
LT		 2758
2759 str = buf;
f796937a 2760 end = buf + size;
1da177e4 2761
f796937a
JF		 2762 /* Make sure end is always >= buf */
2763 if (end < buf) {
2764 end = ((void *)-1);
2765 size = end - buf;
1da177e4
LT		 2766 }
2767
fef20d9c
FW		 2768 while (*fmt) {
2769 const char *old_fmt = fmt;
d4be151b 2770 int read = format_decode(fmt, &spec);
1da177e4 2771
fef20d9c 2772 fmt += read;
1da177e4 2773
fef20d9c
FW		 2774 switch (spec.type) {
2775 case FORMAT_TYPE_NONE: {
2776 int copy = read;
2777 if (str < end) {
2778 if (copy > end - str)
2779 copy = end - str;
2780 memcpy(str, old_fmt, copy);
1da177e4 2781 }
fef20d9c
FW		 2782 str += read;
2783 break;
1da177e4
LT		 2784 }
2785
ed681a91 2786 case FORMAT_TYPE_WIDTH:
4d72ba01 2787 set_field_width(&spec, va_arg(args, int));
fef20d9c 2788 break;
1da177e4 2789
fef20d9c 2790 case FORMAT_TYPE_PRECISION:
4d72ba01 2791 set_precision(&spec, va_arg(args, int));
fef20d9c 2792 break;
1da177e4 2793
d4be151b
AGR		 2794 case FORMAT_TYPE_CHAR: {
2795 char c;
2796
fef20d9c
FW		 2797 if (!(spec.flags & LEFT)) {
2798 while (--spec.field_width > 0) {
f796937a 2799 if (str < end)
1da177e4
LT		 2800 *str = ' ';
2801 ++str;
1da177e4 2802
fef20d9c
FW		 2803 }
2804 }
2805 c = (unsigned char) va_arg(args, int);
2806 if (str < end)
2807 *str = c;
2808 ++str;
2809 while (--spec.field_width > 0) {
f796937a 2810 if (str < end)
fef20d9c 2811 *str = ' ';
1da177e4 2812 ++str;
fef20d9c
FW		 2813 }
2814 break;
d4be151b 2815 }
1da177e4 2816
fef20d9c
FW		 2817 case FORMAT_TYPE_STR:
2818 str = string(str, end, va_arg(args, char *), spec);
2819 break;
1da177e4 2820
fef20d9c 2821 case FORMAT_TYPE_PTR:
ffbfed03 2822 str = pointer(fmt, str, end, va_arg(args, void *),
fef20d9c
FW		 2823 spec);
2824 while (isalnum(*fmt))
2825 fmt++;
2826 break;
1da177e4 2827
fef20d9c
FW		 2828 case FORMAT_TYPE_PERCENT_CHAR:
2829 if (str < end)
2830 *str = '%';
2831 ++str;
2832 break;
1da177e4 2833
fef20d9c 2834 case FORMAT_TYPE_INVALID:
b006f19b
RV		 2835 /*
2836 * Presumably the arguments passed gcc's type
2837 * checking, but there is no safe or sane way
2838 * for us to continue parsing the format and
2839 * fetching from the va_list; the remaining
2840 * specifiers and arguments would be out of
2841 * sync.
2842 */
2843 goto out;
fef20d9c 2844
fef20d9c
FW		 2845 default:
2846 switch (spec.type) {
2847 case FORMAT_TYPE_LONG_LONG:
2848 num = va_arg(args, long long);
2849 break;
2850 case FORMAT_TYPE_ULONG:
2851 num = va_arg(args, unsigned long);
2852 break;
2853 case FORMAT_TYPE_LONG:
2854 num = va_arg(args, long);
2855 break;
2856 case FORMAT_TYPE_SIZE_T:
ef124960
JG		 2857 if (spec.flags & SIGN)
2858 num = va_arg(args, ssize_t);
2859 else
2860 num = va_arg(args, size_t);
fef20d9c
FW		 2861 break;
2862 case FORMAT_TYPE_PTRDIFF:
2863 num = va_arg(args, ptrdiff_t);
2864 break;
a4e94ef0
Z		 2865 case FORMAT_TYPE_UBYTE:
2866 num = (unsigned char) va_arg(args, int);
2867 break;
2868 case FORMAT_TYPE_BYTE:
2869 num = (signed char) va_arg(args, int);
2870 break;
fef20d9c
FW		 2871 case FORMAT_TYPE_USHORT:
2872 num = (unsigned short) va_arg(args, int);
2873 break;
2874 case FORMAT_TYPE_SHORT:
2875 num = (short) va_arg(args, int);
2876 break;
39e874f8
FW		 2877 case FORMAT_TYPE_INT:
2878 num = (int) va_arg(args, int);
fef20d9c
FW		 2879 break;
2880 default:
2881 num = va_arg(args, unsigned int);
2882 }
2883
2884 str = number(str, end, num, spec);
1da177e4 2885 }
1da177e4 2886 }
fef20d9c 2887
b006f19b 2888out:
f796937a
JF		 2889 if (size > 0) {
2890 if (str < end)
2891 *str = '\0';
2892 else
0a6047ee 2893 end[-1] = '\0';
f796937a 2894 }
fef20d9c 2895
f796937a 2896 /* the trailing null byte doesn't count towards the total */
1da177e4 2897 return str-buf;
fef20d9c 2898
1da177e4 2899}
1da177e4
LT		 2900EXPORT_SYMBOL(vsnprintf);
2901
2902/**
2903 * vscnprintf - Format a string and place it in a buffer
2904 * @buf: The buffer to place the result into
2905 * @size: The size of the buffer, including the trailing null space
2906 * @fmt: The format string to use
2907 * @args: Arguments for the format string
2908 *
2909 * The return value is the number of characters which have been written into
b921c69f 2910 * the @buf not including the trailing '\0'. If @size is == 0 the function
1da177e4
LT		 2911 * returns 0.
2912 *
ba1835eb 2913 * If you're not already dealing with a va_list consider using scnprintf().
20036fdc
AK		 2914 *
2915 * See the vsnprintf() documentation for format string extensions over C99.
1da177e4
LT		 2916 */
2917int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
2918{
2919 int i;
2920
ef62c8ff
WL		 2921 if (unlikely(!size))
2922 return 0;
2923
7b9186f5
AGR		 2924 i = vsnprintf(buf, size, fmt, args);
2925
b921c69f
AA		 2926 if (likely(i < size))
2927 return i;
ef62c8ff
WL		 2928
2929 return size - 1;
1da177e4 2930}
1da177e4
LT		 2931EXPORT_SYMBOL(vscnprintf);
2932
2933/**
2934 * snprintf - Format a string and place it in a buffer
2935 * @buf: The buffer to place the result into
2936 * @size: The size of the buffer, including the trailing null space
2937 * @fmt: The format string to use
2938 * @...: Arguments for the format string
2939 *
2940 * The return value is the number of characters which would be
2941 * generated for the given input, excluding the trailing null,
2942 * as per ISO C99. If the return is greater than or equal to
2943 * @size, the resulting string is truncated.
20036fdc
AK		 2944 *
2945 * See the vsnprintf() documentation for format string extensions over C99.
1da177e4 2946 */
7b9186f5 2947int snprintf(char *buf, size_t size, const char *fmt, ...)
1da177e4
LT		 2948{
2949 va_list args;
2950 int i;
2951
2952 va_start(args, fmt);
7b9186f5 2953 i = vsnprintf(buf, size, fmt, args);
1da177e4 2954 va_end(args);
7b9186f5 2955
1da177e4
LT		 2956 return i;
2957}
1da177e4
LT		 2958EXPORT_SYMBOL(snprintf);
2959
2960/**
2961 * scnprintf - Format a string and place it in a buffer
2962 * @buf: The buffer to place the result into
2963 * @size: The size of the buffer, including the trailing null space
2964 * @fmt: The format string to use
2965 * @...: Arguments for the format string
2966 *
2967 * The return value is the number of characters written into @buf not including
b903c0b8 2968 * the trailing '\0'. If @size is == 0 the function returns 0.
1da177e4
LT		 2969 */
2970
7b9186f5 2971int scnprintf(char *buf, size_t size, const char *fmt, ...)
1da177e4
LT		 2972{
2973 va_list args;
2974 int i;
2975
2976 va_start(args, fmt);
b921c69f 2977 i = vscnprintf(buf, size, fmt, args);
1da177e4 2978 va_end(args);
7b9186f5 2979
b921c69f 2980 return i;
1da177e4
LT		 2981}
2982EXPORT_SYMBOL(scnprintf);
2983
2984/**
2985 * vsprintf - Format a string and place it in a buffer
2986 * @buf: The buffer to place the result into
2987 * @fmt: The format string to use
2988 * @args: Arguments for the format string
2989 *
2990 * The function returns the number of characters written
72fd4a35 2991 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
1da177e4
LT		 2992 * buffer overflows.
2993 *
ba1835eb 2994 * If you're not already dealing with a va_list consider using sprintf().
20036fdc
AK		 2995 *
2996 * See the vsnprintf() documentation for format string extensions over C99.
1da177e4
LT		 2997 */
2998int vsprintf(char *buf, const char *fmt, va_list args)
2999{
3000 return vsnprintf(buf, INT_MAX, fmt, args);
3001}
1da177e4
LT		 3002EXPORT_SYMBOL(vsprintf);
3003
3004/**
3005 * sprintf - Format a string and place it in a buffer
3006 * @buf: The buffer to place the result into
3007 * @fmt: The format string to use
3008 * @...: Arguments for the format string
3009 *
3010 * The function returns the number of characters written
72fd4a35 3011 * into @buf. Use snprintf() or scnprintf() in order to avoid
1da177e4 3012 * buffer overflows.
20036fdc
AK		 3013 *
3014 * See the vsnprintf() documentation for format string extensions over C99.
1da177e4 3015 */
7b9186f5 3016int sprintf(char *buf, const char *fmt, ...)
1da177e4
LT		 3017{
3018 va_list args;
3019 int i;
3020
3021 va_start(args, fmt);
7b9186f5 3022 i = vsnprintf(buf, INT_MAX, fmt, args);
1da177e4 3023 va_end(args);
7b9186f5 3024
1da177e4
LT		 3025 return i;
3026}
1da177e4
LT		 3027EXPORT_SYMBOL(sprintf);
3028
4370aa4a
LJ		 3029#ifdef CONFIG_BINARY_PRINTF
3030/*
3031 * bprintf service:
3032 * vbin_printf() - VA arguments to binary data
3033 * bstr_printf() - Binary data to text string
3034 */
3035
3036/**
3037 * vbin_printf - Parse a format string and place args' binary value in a buffer
3038 * @bin_buf: The buffer to place args' binary value
3039 * @size: The size of the buffer(by words(32bits), not characters)
3040 * @fmt: The format string to use
3041 * @args: Arguments for the format string
3042 *
3043 * The format follows C99 vsnprintf, except %n is ignored, and its argument
da3dae54 3044 * is skipped.
4370aa4a
LJ		 3045 *
3046 * The return value is the number of words(32bits) which would be generated for
3047 * the given input.
3048 *
3049 * NOTE:
3050 * If the return value is greater than @size, the resulting bin_buf is NOT
3051 * valid for bstr_printf().
3052 */
3053int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
3054{
fef20d9c 3055 struct printf_spec spec = {0};
4370aa4a 3056 char *str, *end;
841a915d 3057 int width;
4370aa4a
LJ		 3058
3059 str = (char *)bin_buf;
3060 end = (char *)(bin_buf + size);
3061
3062#define save_arg(type) \
841a915d
SRV		 3063({ \
3064 unsigned long long value; \
4370aa4a 3065 if (sizeof(type) == 8) { \
841a915d 3066 unsigned long long val8; \
4370aa4a 3067 str = PTR_ALIGN(str, sizeof(u32)); \
841a915d 3068 val8 = va_arg(args, unsigned long long); \
4370aa4a 3069 if (str + sizeof(type) <= end) { \
841a915d
SRV		 3070 *(u32 *)str = *(u32 *)&val8; \
3071 *(u32 *)(str + 4) = *((u32 *)&val8 + 1); \
4370aa4a 3072 } \
841a915d 3073 value = val8; \
4370aa4a 3074 } else { \
841a915d 3075 unsigned int val4; \
4370aa4a 3076 str = PTR_ALIGN(str, sizeof(type)); \
841a915d 3077 val4 = va_arg(args, int); \
4370aa4a 3078 if (str + sizeof(type) <= end) \
841a915d
SRV		 3079 *(typeof(type) *)str = (type)(long)val4; \
3080 value = (unsigned long long)val4; \
4370aa4a
LJ		 3081 } \
3082 str += sizeof(type); \
841a915d
SRV		 3083 value; \
3084})
4370aa4a 3085
fef20d9c 3086 while (*fmt) {
d4be151b 3087 int read = format_decode(fmt, &spec);
4370aa4a 3088
fef20d9c 3089 fmt += read;
4370aa4a 3090
fef20d9c
FW		 3091 switch (spec.type) {
3092 case FORMAT_TYPE_NONE:
d4be151b 3093 case FORMAT_TYPE_PERCENT_CHAR:
fef20d9c 3094 break;
b006f19b
RV		 3095 case FORMAT_TYPE_INVALID:
3096 goto out;
fef20d9c 3097
ed681a91 3098 case FORMAT_TYPE_WIDTH:
fef20d9c 3099 case FORMAT_TYPE_PRECISION:
841a915d
SRV		 3100 width = (int)save_arg(int);
3101 /* Pointers may require the width */
3102 if (*fmt == 'p')
3103 set_field_width(&spec, width);
fef20d9c
FW		 3104 break;
3105
3106 case FORMAT_TYPE_CHAR:
4370aa4a 3107 save_arg(char);
fef20d9c
FW		 3108 break;
3109
3110 case FORMAT_TYPE_STR: {
4370aa4a 3111 const char *save_str = va_arg(args, char *);
3e5903eb 3112 const char *err_msg;
4370aa4a 3113 size_t len;
6c356634 3114
3e5903eb
PM		 3115 err_msg = check_pointer_msg(save_str);
3116 if (err_msg)
3117 save_str = err_msg;
3118
6c356634
AGR		 3119 len = strlen(save_str) + 1;
3120 if (str + len < end)
3121 memcpy(str, save_str, len);
3122 str += len;
fef20d9c 3123 break;
4370aa4a 3124 }
fef20d9c
FW		 3125
3126 case FORMAT_TYPE_PTR:
841a915d
SRV		 3127 /* Dereferenced pointers must be done now */
3128 switch (*fmt) {
3129 /* Dereference of functions is still OK */
3130 case 'S':
3131 case 's':
1e6338cf
SRV		 3132 case 'x':
3133 case 'K':
57f5677e 3134 case 'e':
841a915d
SRV		 3135 save_arg(void *);
3136 break;
3137 default:
3138 if (!isalnum(*fmt)) {
3139 save_arg(void *);
3140 break;
3141 }
3142 str = pointer(fmt, str, end, va_arg(args, void *),
3143 spec);
3144 if (str + 1 < end)
3145 *str++ = '\0';
3146 else
3147 end[-1] = '\0'; /* Must be nul terminated */
3148 }
4370aa4a 3149 /* skip all alphanumeric pointer suffixes */
fef20d9c 3150 while (isalnum(*fmt))
4370aa4a 3151 fmt++;
fef20d9c
FW		 3152 break;
3153
fef20d9c
FW		 3154 default:
3155 switch (spec.type) {
3156
3157 case FORMAT_TYPE_LONG_LONG:
4370aa4a 3158 save_arg(long long);
fef20d9c
FW		 3159 break;
3160 case FORMAT_TYPE_ULONG:
3161 case FORMAT_TYPE_LONG:
4370aa4a 3162 save_arg(unsigned long);
fef20d9c
FW		 3163 break;
3164 case FORMAT_TYPE_SIZE_T:
4370aa4a 3165 save_arg(size_t);
fef20d9c
FW		 3166 break;
3167 case FORMAT_TYPE_PTRDIFF:
4370aa4a 3168 save_arg(ptrdiff_t);
fef20d9c 3169 break;
a4e94ef0
Z		 3170 case FORMAT_TYPE_UBYTE:
3171 case FORMAT_TYPE_BYTE:
3172 save_arg(char);
3173 break;
fef20d9c
FW		 3174 case FORMAT_TYPE_USHORT:
3175 case FORMAT_TYPE_SHORT:
4370aa4a 3176 save_arg(short);
fef20d9c
FW		 3177 break;
3178 default:
4370aa4a 3179 save_arg(int);
fef20d9c 3180 }
4370aa4a
LJ		 3181 }
3182 }
fef20d9c 3183
b006f19b 3184out:
7b9186f5 3185 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
fef20d9c 3186#undef save_arg
4370aa4a
LJ		 3187}
3188EXPORT_SYMBOL_GPL(vbin_printf);
3189
3190/**
3191 * bstr_printf - Format a string from binary arguments and place it in a buffer
3192 * @buf: The buffer to place the result into
3193 * @size: The size of the buffer, including the trailing null space
3194 * @fmt: The format string to use
3195 * @bin_buf: Binary arguments for the format string
3196 *
3197 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
3198 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
3199 * a binary buffer that generated by vbin_printf.
3200 *
3201 * The format follows C99 vsnprintf, but has some extensions:
0efb4d20 3202 * see vsnprintf comment for details.
4370aa4a
LJ		 3203 *
3204 * The return value is the number of characters which would
3205 * be generated for the given input, excluding the trailing
3206 * '\0', as per ISO C99. If you want to have the exact
3207 * number of characters written into @buf as return value
3208 * (not including the trailing '\0'), use vscnprintf(). If the
3209 * return is greater than or equal to @size, the resulting
3210 * string is truncated.
3211 */
3212int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
3213{
fef20d9c 3214 struct printf_spec spec = {0};
d4be151b
AGR		 3215 char *str, *end;
3216 const char *args = (const char *)bin_buf;
4370aa4a 3217
762abb51 3218 if (WARN_ON_ONCE(size > INT_MAX))
4370aa4a 3219 return 0;
4370aa4a
LJ		 3220
3221 str = buf;
3222 end = buf + size;
3223
3224#define get_arg(type) \
3225({ \
3226 typeof(type) value; \
3227 if (sizeof(type) == 8) { \
3228 args = PTR_ALIGN(args, sizeof(u32)); \
3229 *(u32 *)&value = *(u32 *)args; \
3230 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
3231 } else { \
3232 args = PTR_ALIGN(args, sizeof(type)); \
3233 value = *(typeof(type) *)args; \
3234 } \
3235 args += sizeof(type); \
3236 value; \
3237})
3238
3239 /* Make sure end is always >= buf */
3240 if (end < buf) {
3241 end = ((void *)-1);
3242 size = end - buf;
3243 }
3244
fef20d9c 3245 while (*fmt) {
fef20d9c 3246 const char *old_fmt = fmt;
d4be151b 3247 int read = format_decode(fmt, &spec);
4370aa4a 3248
fef20d9c 3249 fmt += read;
4370aa4a 3250
fef20d9c
FW		 3251 switch (spec.type) {
3252 case FORMAT_TYPE_NONE: {
3253 int copy = read;
3254 if (str < end) {
3255 if (copy > end - str)
3256 copy = end - str;
3257 memcpy(str, old_fmt, copy);
4370aa4a 3258 }
fef20d9c
FW		 3259 str += read;
3260 break;
4370aa4a
LJ		 3261 }
3262
ed681a91 3263 case FORMAT_TYPE_WIDTH:
4d72ba01 3264 set_field_width(&spec, get_arg(int));
fef20d9c 3265 break;
4370aa4a 3266
fef20d9c 3267 case FORMAT_TYPE_PRECISION:
4d72ba01 3268 set_precision(&spec, get_arg(int));
fef20d9c 3269 break;
4370aa4a 3270
d4be151b
AGR		 3271 case FORMAT_TYPE_CHAR: {
3272 char c;
3273
fef20d9c
FW		 3274 if (!(spec.flags & LEFT)) {
3275 while (--spec.field_width > 0) {
4370aa4a
LJ		 3276 if (str < end)
3277 *str = ' ';
3278 ++str;
3279 }
3280 }
3281 c = (unsigned char) get_arg(char);
3282 if (str < end)
3283 *str = c;
3284 ++str;
fef20d9c 3285 while (--spec.field_width > 0) {
4370aa4a
LJ		 3286 if (str < end)
3287 *str = ' ';
3288 ++str;
3289 }
fef20d9c 3290 break;
d4be151b 3291 }
4370aa4a 3292
fef20d9c 3293 case FORMAT_TYPE_STR: {
4370aa4a 3294 const char *str_arg = args;
d4be151b 3295 args += strlen(str_arg) + 1;
fef20d9c
FW		 3296 str = string(str, end, (char *)str_arg, spec);
3297 break;
4370aa4a
LJ		 3298 }
3299
841a915d
SRV		 3300 case FORMAT_TYPE_PTR: {
3301 bool process = false;
3302 int copy, len;
3303 /* Non function dereferences were already done */
3304 switch (*fmt) {
3305 case 'S':
3306 case 's':
1e6338cf
SRV		 3307 case 'x':
3308 case 'K':
57f5677e 3309 case 'e':
841a915d
SRV		 3310 process = true;
3311 break;
3312 default:
3313 if (!isalnum(*fmt)) {
3314 process = true;
3315 break;
3316 }
3317 /* Pointer dereference was already processed */
3318 if (str < end) {
3319 len = copy = strlen(args);
3320 if (copy > end - str)
3321 copy = end - str;
3322 memcpy(str, args, copy);
3323 str += len;
62165600 3324 args += len + 1;
841a915d
SRV		 3325 }
3326 }
3327 if (process)
3328 str = pointer(fmt, str, end, get_arg(void *), spec);
3329
fef20d9c 3330 while (isalnum(*fmt))
4370aa4a 3331 fmt++;
fef20d9c 3332 break;
841a915d 3333 }
4370aa4a 3334
fef20d9c 3335 case FORMAT_TYPE_PERCENT_CHAR:
4370aa4a
LJ		 3336 if (str < end)
3337 *str = '%';
3338 ++str;
fef20d9c
FW		 3339 break;
3340
b006f19b
RV		 3341 case FORMAT_TYPE_INVALID:
3342 goto out;
3343
d4be151b
AGR		 3344 default: {
3345 unsigned long long num;
3346
fef20d9c
FW		 3347 switch (spec.type) {
3348
3349 case FORMAT_TYPE_LONG_LONG:
3350 num = get_arg(long long);
3351 break;
3352 case FORMAT_TYPE_ULONG:
fef20d9c
FW		 3353 case FORMAT_TYPE_LONG:
3354 num = get_arg(unsigned long);
3355 break;
3356 case FORMAT_TYPE_SIZE_T:
3357 num = get_arg(size_t);
3358 break;
3359 case FORMAT_TYPE_PTRDIFF:
3360 num = get_arg(ptrdiff_t);
3361 break;
a4e94ef0
Z		 3362 case FORMAT_TYPE_UBYTE:
3363 num = get_arg(unsigned char);
3364 break;
3365 case FORMAT_TYPE_BYTE:
3366 num = get_arg(signed char);
3367 break;
fef20d9c
FW		 3368 case FORMAT_TYPE_USHORT:
3369 num = get_arg(unsigned short);
3370 break;
3371 case FORMAT_TYPE_SHORT:
3372 num = get_arg(short);
3373 break;
3374 case FORMAT_TYPE_UINT:
3375 num = get_arg(unsigned int);
3376 break;
3377 default:
3378 num = get_arg(int);
3379 }
3380
3381 str = number(str, end, num, spec);
d4be151b
AGR		 3382 } /* default: */
3383 } /* switch(spec.type) */
3384 } /* while(*fmt) */
fef20d9c 3385
b006f19b 3386out:
4370aa4a
LJ		 3387 if (size > 0) {
3388 if (str < end)
3389 *str = '\0';
3390 else
3391 end[-1] = '\0';
3392 }
fef20d9c 3393
4370aa4a
LJ		 3394#undef get_arg
3395
3396 /* the trailing null byte doesn't count towards the total */
3397 return str - buf;
3398}
3399EXPORT_SYMBOL_GPL(bstr_printf);
3400
3401/**
3402 * bprintf - Parse a format string and place args' binary value in a buffer
3403 * @bin_buf: The buffer to place args' binary value
3404 * @size: The size of the buffer(by words(32bits), not characters)
3405 * @fmt: The format string to use
3406 * @...: Arguments for the format string
3407 *
3408 * The function returns the number of words(u32) written
3409 * into @bin_buf.
3410 */
3411int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
3412{
3413 va_list args;
3414 int ret;
3415
3416 va_start(args, fmt);
3417 ret = vbin_printf(bin_buf, size, fmt, args);
3418 va_end(args);
7b9186f5 3419
4370aa4a
LJ		 3420 return ret;
3421}
3422EXPORT_SYMBOL_GPL(bprintf);
3423
3424#endif /* CONFIG_BINARY_PRINTF */
3425
1da177e4
LT		 3426/**
3427 * vsscanf - Unformat a buffer into a list of arguments
3428 * @buf: input buffer
3429 * @fmt: format of buffer
3430 * @args: arguments
3431 */
7b9186f5 3432int vsscanf(const char *buf, const char *fmt, va_list args)
1da177e4
LT		 3433{
3434 const char *str = buf;
3435 char *next;
3436 char digit;
3437 int num = 0;
ef0658f3 3438 u8 qualifier;
53809751
JB		 3439 unsigned int base;
3440 union {
3441 long long s;
3442 unsigned long long u;
3443 } val;
ef0658f3 3444 s16 field_width;
d4be151b 3445 bool is_sign;
1da177e4 3446
da99075c 3447 while (*fmt) {
1da177e4 3448 /* skip any white space in format */
9dbbc3b9 3449 /* white space in format matches any amount of
1da177e4
LT		 3450 * white space, including none, in the input.
3451 */
3452 if (isspace(*fmt)) {
e7d2860b
AGR		 3453 fmt = skip_spaces(++fmt);
3454 str = skip_spaces(str);
1da177e4
LT		 3455 }
3456
3457 /* anything that is not a conversion must match exactly */
3458 if (*fmt != '%' && *fmt) {
3459 if (*fmt++ != *str++)
3460 break;
3461 continue;
3462 }
3463
3464 if (!*fmt)
3465 break;
3466 ++fmt;
7b9186f5 3467
1da177e4
LT		 3468 /* skip this conversion.
3469 * advance both strings to next white space
3470 */
3471 if (*fmt == '*') {
da99075c
JB		 3472 if (!*str)
3473 break;
f9310b2f
JY		 3474 while (!isspace(*fmt) && *fmt != '%' && *fmt) {
3475 /* '%*[' not yet supported, invalid format */
3476 if (*fmt == '[')
3477 return num;
1da177e4 3478 fmt++;
f9310b2f 3479 }
1da177e4
LT		 3480 while (!isspace(*str) && *str)
3481 str++;
3482 continue;
3483 }
3484
3485 /* get field width */
3486 field_width = -1;
53809751 3487 if (isdigit(*fmt)) {
1da177e4 3488 field_width = skip_atoi(&fmt);
53809751
JB		 3489 if (field_width <= 0)
3490 break;
3491 }
1da177e4
LT		 3492
3493 /* get conversion qualifier */
3494 qualifier = -1;
75fb8f26 3495 if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
5b5e0928 3496 *fmt == 'z') {
1da177e4
LT		 3497 qualifier = *fmt++;
3498 if (unlikely(qualifier == *fmt)) {
3499 if (qualifier == 'h') {
3500 qualifier = 'H';
3501 fmt++;
3502 } else if (qualifier == 'l') {
3503 qualifier = 'L';
3504 fmt++;
3505 }
3506 }
3507 }
1da177e4 3508
da99075c
JB		 3509 if (!*fmt)
3510 break;
3511
3512 if (*fmt == 'n') {
3513 /* return number of characters read so far */
3514 *va_arg(args, int *) = str - buf;
3515 ++fmt;
3516 continue;
3517 }
3518
3519 if (!*str)
1da177e4
LT		 3520 break;
3521
d4be151b 3522 base = 10;
3f623eba 3523 is_sign = false;
d4be151b 3524
7b9186f5 3525 switch (*fmt++) {
1da177e4
LT		 3526 case 'c':
3527 {
7b9186f5 3528 char *s = (char *)va_arg(args, char*);
1da177e4
LT		 3529 if (field_width == -1)
3530 field_width = 1;
3531 do {
3532 *s++ = *str++;
3533 } while (--field_width > 0 && *str);
3534 num++;
3535 }
3536 continue;
3537 case 's':
3538 {
7b9186f5
AGR		 3539 char *s = (char *)va_arg(args, char *);
3540 if (field_width == -1)
4be929be 3541 field_width = SHRT_MAX;
1da177e4 3542 /* first, skip leading white space in buffer */
e7d2860b 3543 str = skip_spaces(str);
1da177e4
LT		 3544
3545 /* now copy until next white space */
7b9186f5 3546 while (*str && !isspace(*str) && field_width--)
1da177e4 3547 *s++ = *str++;
1da177e4
LT		 3548 *s = '\0';
3549 num++;
3550 }
3551 continue;
f9310b2f
JY		 3552 /*
3553 * Warning: This implementation of the '[' conversion specifier
3554 * deviates from its glibc counterpart in the following ways:
3555 * (1) It does NOT support ranges i.e. '-' is NOT a special
3556 * character
3557 * (2) It cannot match the closing bracket ']' itself
3558 * (3) A field width is required
3559 * (4) '%*[' (discard matching input) is currently not supported
3560 *
3561 * Example usage:
3562 * ret = sscanf("00:0a:95","%2[^:]:%2[^:]:%2[^:]",
3563 * buf1, buf2, buf3);
3564 * if (ret < 3)
3565 * // etc..
3566 */
3567 case '[':
3568 {
3569 char *s = (char *)va_arg(args, char *);
3570 DECLARE_BITMAP(set, 256) = {0};
3571 unsigned int len = 0;
3572 bool negate = (*fmt == '^');
3573
3574 /* field width is required */
3575 if (field_width == -1)
3576 return num;
3577
3578 if (negate)
3579 ++fmt;
3580
3581 for ( ; *fmt && *fmt != ']'; ++fmt, ++len)
52e68cd6 3582 __set_bit((u8)*fmt, set);
f9310b2f
JY		 3583
3584 /* no ']' or no character set found */
3585 if (!*fmt || !len)
3586 return num;
3587 ++fmt;
3588
3589 if (negate) {
3590 bitmap_complement(set, set, 256);
3591 /* exclude null '\0' byte */
52e68cd6 3592 __clear_bit(0, set);
f9310b2f
JY		 3593 }
3594
3595 /* match must be non-empty */
3596 if (!test_bit((u8)*str, set))
3597 return num;
3598
3599 while (test_bit((u8)*str, set) && field_width--)
3600 *s++ = *str++;
3601 *s = '\0';
3602 ++num;
3603 }
3604 continue;
1da177e4
LT		 3605 case 'o':
3606 base = 8;
3607 break;
3608 case 'x':
3609 case 'X':
3610 base = 16;
3611 break;
3612 case 'i':
7b9186f5 3613 base = 0;
4c1ca831 3614 fallthrough;
1da177e4 3615 case 'd':
3f623eba 3616 is_sign = true;
4c1ca831 3617 fallthrough;
1da177e4
LT		 3618 case 'u':
3619 break;
3620 case '%':
3621 /* looking for '%' in str */
7b9186f5 3622 if (*str++ != '%')
1da177e4
LT		 3623 return num;
3624 continue;
3625 default:
3626 /* invalid format; stop here */
3627 return num;
3628 }
3629
3630 /* have some sort of integer conversion.
3631 * first, skip white space in buffer.
3632 */
e7d2860b 3633 str = skip_spaces(str);
1da177e4
LT		 3634
3635 digit = *str;
11b3dda5
RF		 3636 if (is_sign && digit == '-') {
3637 if (field_width == 1)
3638 break;
3639
1da177e4 3640 digit = *(str + 1);
11b3dda5 3641 }
1da177e4
LT		 3642
3643 if (!digit
7b9186f5
AGR		 3644 || (base == 16 && !isxdigit(digit))
3645 || (base == 10 && !isdigit(digit))
48e1a66f 3646 || (base == 8 && !isodigit(digit))
7b9186f5
AGR		 3647 || (base == 0 && !isdigit(digit)))
3648 break;
1da177e4 3649
53809751 3650 if (is_sign)
900fdc45
RF		 3651 val.s = simple_strntoll(str,
3652 field_width >= 0 ? field_width : INT_MAX,
3653 &next, base);
53809751 3654 else
900fdc45
RF		 3655 val.u = simple_strntoull(str,
3656 field_width >= 0 ? field_width : INT_MAX,
3657 &next, base);
53809751 3658
7b9186f5 3659 switch (qualifier) {
1da177e4 3660 case 'H': /* that's 'hh' in format */
53809751
JB		 3661 if (is_sign)
3662 *va_arg(args, signed char *) = val.s;
3663 else
3664 *va_arg(args, unsigned char *) = val.u;
1da177e4
LT		 3665 break;
3666 case 'h':
53809751
JB		 3667 if (is_sign)
3668 *va_arg(args, short *) = val.s;
3669 else
3670 *va_arg(args, unsigned short *) = val.u;
1da177e4
LT		 3671 break;
3672 case 'l':
53809751
JB		 3673 if (is_sign)
3674 *va_arg(args, long *) = val.s;
3675 else
3676 *va_arg(args, unsigned long *) = val.u;
1da177e4
LT		 3677 break;
3678 case 'L':
53809751
JB		 3679 if (is_sign)
3680 *va_arg(args, long long *) = val.s;
3681 else
3682 *va_arg(args, unsigned long long *) = val.u;
1da177e4 3683 break;
1da177e4 3684 case 'z':
53809751
JB		 3685 *va_arg(args, size_t *) = val.u;
3686 break;
1da177e4 3687 default:
53809751
JB		 3688 if (is_sign)
3689 *va_arg(args, int *) = val.s;
3690 else
3691 *va_arg(args, unsigned int *) = val.u;
1da177e4
LT		 3692 break;
3693 }
3694 num++;
3695
3696 if (!next)
3697 break;
3698 str = next;
3699 }
c6b40d16 3700
1da177e4
LT		 3701 return num;
3702}
1da177e4
LT		 3703EXPORT_SYMBOL(vsscanf);
3704
3705/**
3706 * sscanf - Unformat a buffer into a list of arguments
3707 * @buf: input buffer
3708 * @fmt: formatting of buffer
3709 * @...: resulting arguments
3710 */
7b9186f5 3711int sscanf(const char *buf, const char *fmt, ...)
1da177e4
LT		 3712{
3713 va_list args;
3714 int i;
3715
7b9186f5
AGR		 3716 va_start(args, fmt);
3717 i = vsscanf(buf, fmt, args);
1da177e4 3718 va_end(args);
7b9186f5 3719
1da177e4
LT		 3720 return i;
3721}
1da177e4 3722EXPORT_SYMBOL(sscanf);
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