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Merge tag 'printk-for-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/printk...
[linux-block.git] / lib / vsprintf.c
CommitLineData
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
20#include <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>
7daac5b2 37#include <linux/time.h>
2b1b0d66 38#include <linux/uuid.h>
ce4fecf1 39#include <linux/of.h>
8a27f7c9 40#include <net/addrconf.h>
ad67b74d
TH		 41#include <linux/siphash.h>
42#include <linux/compiler.h>
a92eb762 43#include <linux/property.h>
1031bc58
DM		 44#ifdef CONFIG_BLOCK
45#include <linux/blkdev.h>
46#endif
1da177e4 47
edf14cdb
VB		 48#include "../mm/internal.h" /* For the trace_print_flags arrays */
49
4e57b681 50#include <asm/page.h> /* for PAGE_SIZE */
7c43d9a3 51#include <asm/byteorder.h> /* cpu_to_le16 */
1da177e4 52
71dca95d 53#include <linux/string_helpers.h>
1dff46d6 54#include "kstrtox.h"
aa46a63e 55
1da177e4 56/**
922ac25c 57 * simple_strtoull - convert a string to an unsigned long long
1da177e4
LT		 58 * @cp: The start of the string
59 * @endp: A pointer to the end of the parsed string will be placed here
60 * @base: The number base to use
462e4711 61 *
e8cc2b97 62 * This function has caveats. Please use kstrtoull instead.
1da177e4 63 */
922ac25c 64unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
1da177e4 65{
1dff46d6
AD		 66 unsigned long long result;
67 unsigned int rv;
aa46a63e 68
1dff46d6
AD		 69 cp = _parse_integer_fixup_radix(cp, &base);
70 rv = _parse_integer(cp, base, &result);
71 /* FIXME */
72 cp += (rv & ~KSTRTOX_OVERFLOW);
aa46a63e 73
1da177e4
LT		 74 if (endp)
75 *endp = (char *)cp;
7b9186f5 76
1da177e4
LT		 77 return result;
78}
922ac25c 79EXPORT_SYMBOL(simple_strtoull);
1da177e4
LT		 80
81/**
922ac25c 82 * simple_strtoul - convert a string to an unsigned long
1da177e4
LT		 83 * @cp: The start of the string
84 * @endp: A pointer to the end of the parsed string will be placed here
85 * @base: The number base to use
462e4711 86 *
e8cc2b97 87 * This function has caveats. Please use kstrtoul instead.
1da177e4 88 */
922ac25c 89unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
1da177e4 90{
922ac25c 91 return simple_strtoull(cp, endp, base);
1da177e4 92}
922ac25c 93EXPORT_SYMBOL(simple_strtoul);
1da177e4
LT		 94
95/**
922ac25c 96 * simple_strtol - convert a string to a signed long
1da177e4
LT		 97 * @cp: The start of the string
98 * @endp: A pointer to the end of the parsed string will be placed here
99 * @base: The number base to use
462e4711 100 *
e8cc2b97 101 * This function has caveats. Please use kstrtol instead.
1da177e4 102 */
922ac25c 103long simple_strtol(const char *cp, char **endp, unsigned int base)
1da177e4 104{
922ac25c
AGR		 105 if (*cp == '-')
106 return -simple_strtoul(cp + 1, endp, base);
7b9186f5 107
922ac25c 108 return simple_strtoul(cp, endp, base);
1da177e4 109}
922ac25c 110EXPORT_SYMBOL(simple_strtol);
1da177e4
LT		 111
112/**
113 * simple_strtoll - convert a string to a signed long long
114 * @cp: The start of the string
115 * @endp: A pointer to the end of the parsed string will be placed here
116 * @base: The number base to use
462e4711 117 *
e8cc2b97 118 * This function has caveats. Please use kstrtoll instead.
1da177e4 119 */
22d27051 120long long simple_strtoll(const char *cp, char **endp, unsigned int base)
1da177e4 121{
7b9186f5 122 if (*cp == '-')
22d27051 123 return -simple_strtoull(cp + 1, endp, base);
7b9186f5 124
22d27051 125 return simple_strtoull(cp, endp, base);
1da177e4 126}
98d5ce0d 127EXPORT_SYMBOL(simple_strtoll);
1da177e4 128
cf3b429b
JP		 129static noinline_for_stack
130int skip_atoi(const char **s)
1da177e4 131{
7b9186f5 132 int i = 0;
1da177e4 133
43e5b666 134 do {
1da177e4 135 i = i*10 + *((*s)++) - '0';
43e5b666 136 } while (isdigit(**s));
7b9186f5 137
1da177e4
LT		 138 return i;
139}
140
7c43d9a3
RV		 141/*
142 * Decimal conversion is by far the most typical, and is used for
143 * /proc and /sys data. This directly impacts e.g. top performance
144 * with many processes running. We optimize it for speed by emitting
145 * two characters at a time, using a 200 byte lookup table. This
146 * roughly halves the number of multiplications compared to computing
147 * the digits one at a time. Implementation strongly inspired by the
148 * previous version, which in turn used ideas described at
149 * <http://www.cs.uiowa.edu/~jones/bcd/divide.html> (with permission
150 * from the author, Douglas W. Jones).
151 *
152 * It turns out there is precisely one 26 bit fixed-point
153 * approximation a of 64/100 for which x/100 == (x * (u64)a) >> 32
154 * holds for all x in [0, 10^8-1], namely a = 0x28f5c29. The actual
155 * range happens to be somewhat larger (x <= 1073741898), but that's
156 * irrelevant for our purpose.
157 *
158 * For dividing a number in the range [10^4, 10^6-1] by 100, we still
159 * need a 32x32->64 bit multiply, so we simply use the same constant.
160 *
161 * For dividing a number in the range [100, 10^4-1] by 100, there are
162 * several options. The simplest is (x * 0x147b) >> 19, which is valid
163 * for all x <= 43698.
133fd9f5 164 */
4277eedd 165
7c43d9a3
RV		 166static const u16 decpair[100] = {
167#define _(x) (__force u16) cpu_to_le16(((x % 10) | ((x / 10) << 8)) + 0x3030)
168 _( 0), _( 1), _( 2), _( 3), _( 4), _( 5), _( 6), _( 7), _( 8), _( 9),
169 _(10), _(11), _(12), _(13), _(14), _(15), _(16), _(17), _(18), _(19),
170 _(20), _(21), _(22), _(23), _(24), _(25), _(26), _(27), _(28), _(29),
171 _(30), _(31), _(32), _(33), _(34), _(35), _(36), _(37), _(38), _(39),
172 _(40), _(41), _(42), _(43), _(44), _(45), _(46), _(47), _(48), _(49),
173 _(50), _(51), _(52), _(53), _(54), _(55), _(56), _(57), _(58), _(59),
174 _(60), _(61), _(62), _(63), _(64), _(65), _(66), _(67), _(68), _(69),
175 _(70), _(71), _(72), _(73), _(74), _(75), _(76), _(77), _(78), _(79),
176 _(80), _(81), _(82), _(83), _(84), _(85), _(86), _(87), _(88), _(89),
177 _(90), _(91), _(92), _(93), _(94), _(95), _(96), _(97), _(98), _(99),
178#undef _
179};
180
181/*
182 * This will print a single '0' even if r == 0, since we would
675cf53c
RV		 183 * immediately jump to out_r where two 0s would be written but only
184 * one of them accounted for in buf. This is needed by ip4_string
185 * below. All other callers pass a non-zero value of r.
7c43d9a3 186*/
cf3b429b 187static noinline_for_stack
7c43d9a3 188char *put_dec_trunc8(char *buf, unsigned r)
4277eedd 189{
7c43d9a3
RV		 190 unsigned q;
191
192 /* 1 <= r < 10^8 */
193 if (r < 100)
194 goto out_r;
195
196 /* 100 <= r < 10^8 */
197 q = (r * (u64)0x28f5c29) >> 32;
198 *((u16 *)buf) = decpair[r - 100*q];
199 buf += 2;
200
201 /* 1 <= q < 10^6 */
202 if (q < 100)
203 goto out_q;
204
205 /* 100 <= q < 10^6 */
206 r = (q * (u64)0x28f5c29) >> 32;
207 *((u16 *)buf) = decpair[q - 100*r];
208 buf += 2;
209
210 /* 1 <= r < 10^4 */
211 if (r < 100)
212 goto out_r;
213
214 /* 100 <= r < 10^4 */
215 q = (r * 0x147b) >> 19;
216 *((u16 *)buf) = decpair[r - 100*q];
217 buf += 2;
218out_q:
219 /* 1 <= q < 100 */
220 r = q;
221out_r:
222 /* 1 <= r < 100 */
223 *((u16 *)buf) = decpair[r];
675cf53c 224 buf += r < 10 ? 1 : 2;
4277eedd
DV		 225 return buf;
226}
133fd9f5 227
7c43d9a3 228#if BITS_PER_LONG == 64 && BITS_PER_LONG_LONG == 64
cf3b429b 229static noinline_for_stack
7c43d9a3 230char *put_dec_full8(char *buf, unsigned r)
4277eedd 231{
133fd9f5
DV		 232 unsigned q;
233
7c43d9a3
RV		 234 /* 0 <= r < 10^8 */
235 q = (r * (u64)0x28f5c29) >> 32;
236 *((u16 *)buf) = decpair[r - 100*q];
237 buf += 2;
4277eedd 238
7c43d9a3
RV		 239 /* 0 <= q < 10^6 */
240 r = (q * (u64)0x28f5c29) >> 32;
241 *((u16 *)buf) = decpair[q - 100*r];
242 buf += 2;
7b9186f5 243
7c43d9a3
RV		 244 /* 0 <= r < 10^4 */
245 q = (r * 0x147b) >> 19;
246 *((u16 *)buf) = decpair[r - 100*q];
247 buf += 2;
133fd9f5 248
7c43d9a3
RV		 249 /* 0 <= q < 100 */
250 *((u16 *)buf) = decpair[q];
251 buf += 2;
252 return buf;
253}
133fd9f5 254
7c43d9a3 255static noinline_for_stack
133fd9f5
DV		 256char *put_dec(char *buf, unsigned long long n)
257{
7c43d9a3
RV		 258 if (n >= 100*1000*1000)
259 buf = put_dec_full8(buf, do_div(n, 100*1000*1000));
260 /* 1 <= n <= 1.6e11 */
261 if (n >= 100*1000*1000)
262 buf = put_dec_full8(buf, do_div(n, 100*1000*1000));
263 /* 1 <= n < 1e8 */
133fd9f5 264 return put_dec_trunc8(buf, n);
4277eedd 265}
133fd9f5 266
7c43d9a3 267#elif BITS_PER_LONG == 32 && BITS_PER_LONG_LONG == 64
133fd9f5 268
7c43d9a3
RV		 269static void
270put_dec_full4(char *buf, unsigned r)
4277eedd 271{
7c43d9a3
RV		 272 unsigned q;
273
274 /* 0 <= r < 10^4 */
275 q = (r * 0x147b) >> 19;
276 *((u16 *)buf) = decpair[r - 100*q];
277 buf += 2;
278 /* 0 <= q < 100 */
279 *((u16 *)buf) = decpair[q];
2359172a
GS		 280}
281
282/*
283 * Call put_dec_full4 on x % 10000, return x / 10000.
284 * The approximation x/10000 == (x * 0x346DC5D7) >> 43
285 * holds for all x < 1,128,869,999. The largest value this
286 * helper will ever be asked to convert is 1,125,520,955.
7c43d9a3 287 * (second call in the put_dec code, assuming n is all-ones).
2359172a 288 */
7c43d9a3 289static noinline_for_stack
2359172a
GS		 290unsigned put_dec_helper4(char *buf, unsigned x)
291{
292 uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43;
293
294 put_dec_full4(buf, x - q * 10000);
295 return q;
4277eedd
DV		 296}
297
133fd9f5
DV		 298/* Based on code by Douglas W. Jones found at
299 * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour>
300 * (with permission from the author).
301 * Performs no 64-bit division and hence should be fast on 32-bit machines.
302 */
303static
304char *put_dec(char *buf, unsigned long long n)
305{
306 uint32_t d3, d2, d1, q, h;
307
308 if (n < 100*1000*1000)
309 return put_dec_trunc8(buf, n);
310
311 d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */
312 h = (n >> 32);
313 d2 = (h ) & 0xffff;
314 d3 = (h >> 16); /* implicit "& 0xffff" */
315
7c43d9a3
RV		 316 /* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0
317 = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */
133fd9f5 318 q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff);
2359172a
GS		 319 q = put_dec_helper4(buf, q);
320
321 q += 7671 * d3 + 9496 * d2 + 6 * d1;
322 q = put_dec_helper4(buf+4, q);
323
324 q += 4749 * d3 + 42 * d2;
325 q = put_dec_helper4(buf+8, q);
133fd9f5 326
2359172a
GS		 327 q += 281 * d3;
328 buf += 12;
329 if (q)
330 buf = put_dec_trunc8(buf, q);
331 else while (buf[-1] == '0')
133fd9f5
DV		 332 --buf;
333
334 return buf;
335}
336
337#endif
338
1ac101a5
KH		 339/*
340 * Convert passed number to decimal string.
341 * Returns the length of string. On buffer overflow, returns 0.
342 *
343 * If speed is not important, use snprintf(). It's easy to read the code.
344 */
d1be35cb 345int num_to_str(char *buf, int size, unsigned long long num, unsigned int width)
1ac101a5 346{
7c43d9a3
RV		 347 /* put_dec requires 2-byte alignment of the buffer. */
348 char tmp[sizeof(num) * 3] __aligned(2);
1ac101a5
KH		 349 int idx, len;
350
133fd9f5
DV		 351 /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */
352 if (num <= 9) {
353 tmp[0] = '0' + num;
354 len = 1;
355 } else {
356 len = put_dec(tmp, num) - tmp;
357 }
1ac101a5 358
d1be35cb 359 if (len > size || width > size)
1ac101a5 360 return 0;
d1be35cb
AV		 361
362 if (width > len) {
363 width = width - len;
364 for (idx = 0; idx < width; idx++)
365 buf[idx] = ' ';
366 } else {
367 width = 0;
368 }
369
1ac101a5 370 for (idx = 0; idx < len; ++idx)
d1be35cb
AV		 371 buf[idx + width] = tmp[len - idx - 1];
372
373 return len + width;
1ac101a5
KH		 374}
375
51be17df 376#define SIGN 1 /* unsigned/signed, must be 1 */
d1c1b121 377#define LEFT 2 /* left justified */
1da177e4
LT		 378#define PLUS 4 /* show plus */
379#define SPACE 8 /* space if plus */
d1c1b121 380#define ZEROPAD 16 /* pad with zero, must be 16 == '0' - ' ' */
b89dc5d6
BH		 381#define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
382#define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
1da177e4 383
b886690d
AS		 384static_assert(ZEROPAD == ('0' - ' '));
385static_assert(SMALL == ' ');
386
fef20d9c
FW		 387enum format_type {
388 FORMAT_TYPE_NONE, /* Just a string part */
ed681a91 389 FORMAT_TYPE_WIDTH,
fef20d9c
FW		 390 FORMAT_TYPE_PRECISION,
391 FORMAT_TYPE_CHAR,
392 FORMAT_TYPE_STR,
393 FORMAT_TYPE_PTR,
394 FORMAT_TYPE_PERCENT_CHAR,
395 FORMAT_TYPE_INVALID,
396 FORMAT_TYPE_LONG_LONG,
397 FORMAT_TYPE_ULONG,
398 FORMAT_TYPE_LONG,
a4e94ef0
Z		 399 FORMAT_TYPE_UBYTE,
400 FORMAT_TYPE_BYTE,
fef20d9c
FW		 401 FORMAT_TYPE_USHORT,
402 FORMAT_TYPE_SHORT,
403 FORMAT_TYPE_UINT,
404 FORMAT_TYPE_INT,
fef20d9c
FW		 405 FORMAT_TYPE_SIZE_T,
406 FORMAT_TYPE_PTRDIFF
407};
408
409struct printf_spec {
d0484193
RV		 410 unsigned int type:8; /* format_type enum */
411 signed int field_width:24; /* width of output field */
412 unsigned int flags:8; /* flags to number() */
413 unsigned int base:8; /* number base, 8, 10 or 16 only */
414 signed int precision:16; /* # of digits/chars */
415} __packed;
ef27ac18
RV		 416static_assert(sizeof(struct printf_spec) == 8);
417
4d72ba01
RV		 418#define FIELD_WIDTH_MAX ((1 << 23) - 1)
419#define PRECISION_MAX ((1 << 15) - 1)
fef20d9c 420
cf3b429b
JP		 421static noinline_for_stack
422char *number(char *buf, char *end, unsigned long long num,
423 struct printf_spec spec)
1da177e4 424{
7c43d9a3
RV		 425 /* put_dec requires 2-byte alignment of the buffer. */
426 char tmp[3 * sizeof(num)] __aligned(2);
9b706aee
DV		 427 char sign;
428 char locase;
fef20d9c 429 int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
1da177e4 430 int i;
7c203422 431 bool is_zero = num == 0LL;
1c7a8e62
RV		 432 int field_width = spec.field_width;
433 int precision = spec.precision;
1da177e4 434
9b706aee
DV		 435 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
436 * produces same digits or (maybe lowercased) letters */
fef20d9c
FW		 437 locase = (spec.flags & SMALL);
438 if (spec.flags & LEFT)
439 spec.flags &= ~ZEROPAD;
1da177e4 440 sign = 0;
fef20d9c 441 if (spec.flags & SIGN) {
7b9186f5 442 if ((signed long long)num < 0) {
1da177e4 443 sign = '-';
7b9186f5 444 num = -(signed long long)num;
1c7a8e62 445 field_width--;
fef20d9c 446 } else if (spec.flags & PLUS) {
1da177e4 447 sign = '+';
1c7a8e62 448 field_width--;
fef20d9c 449 } else if (spec.flags & SPACE) {
1da177e4 450 sign = ' ';
1c7a8e62 451 field_width--;
1da177e4
LT		 452 }
453 }
b39a7340 454 if (need_pfx) {
fef20d9c 455 if (spec.base == 16)
1c7a8e62 456 field_width -= 2;
7c203422 457 else if (!is_zero)
1c7a8e62 458 field_width--;
1da177e4 459 }
b39a7340
DV		 460
461 /* generate full string in tmp[], in reverse order */
1da177e4 462 i = 0;
133fd9f5 463 if (num < spec.base)
3ea8d440 464 tmp[i++] = hex_asc_upper[num] | locase;
fef20d9c
FW		 465 else if (spec.base != 10) { /* 8 or 16 */
466 int mask = spec.base - 1;
b39a7340 467 int shift = 3;
7b9186f5
AGR		 468
469 if (spec.base == 16)
470 shift = 4;
b39a7340 471 do {
3ea8d440 472 tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase);
b39a7340
DV		 473 num >>= shift;
474 } while (num);
4277eedd
DV		 475 } else { /* base 10 */
476 i = put_dec(tmp, num) - tmp;
477 }
b39a7340
DV		 478
479 /* printing 100 using %2d gives "100", not "00" */
1c7a8e62
RV		 480 if (i > precision)
481 precision = i;
b39a7340 482 /* leading space padding */
1c7a8e62 483 field_width -= precision;
51be17df 484 if (!(spec.flags & (ZEROPAD | LEFT))) {
1c7a8e62 485 while (--field_width >= 0) {
f796937a 486 if (buf < end)
1da177e4
LT		 487 *buf = ' ';
488 ++buf;
489 }
490 }
b39a7340 491 /* sign */
1da177e4 492 if (sign) {
f796937a 493 if (buf < end)
1da177e4
LT		 494 *buf = sign;
495 ++buf;
496 }
b39a7340
DV		 497 /* "0x" / "0" prefix */
498 if (need_pfx) {
7c203422
PC		 499 if (spec.base == 16 || !is_zero) {
500 if (buf < end)
501 *buf = '0';
502 ++buf;
503 }
fef20d9c 504 if (spec.base == 16) {
f796937a 505 if (buf < end)
9b706aee 506 *buf = ('X' | locase);
1da177e4
LT		 507 ++buf;
508 }
509 }
b39a7340 510 /* zero or space padding */
fef20d9c 511 if (!(spec.flags & LEFT)) {
d1c1b121 512 char c = ' ' + (spec.flags & ZEROPAD);
b886690d 513
1c7a8e62 514 while (--field_width >= 0) {
f796937a 515 if (buf < end)
1da177e4
LT		 516 *buf = c;
517 ++buf;
518 }
519 }
b39a7340 520 /* hmm even more zero padding? */
1c7a8e62 521 while (i <= --precision) {
f796937a 522 if (buf < end)
1da177e4
LT		 523 *buf = '0';
524 ++buf;
525 }
b39a7340
DV		 526 /* actual digits of result */
527 while (--i >= 0) {
f796937a 528 if (buf < end)
1da177e4
LT		 529 *buf = tmp[i];
530 ++buf;
531 }
b39a7340 532 /* trailing space padding */
1c7a8e62 533 while (--field_width >= 0) {
f796937a 534 if (buf < end)
1da177e4
LT		 535 *buf = ' ';
536 ++buf;
537 }
7b9186f5 538
1da177e4
LT		 539 return buf;
540}
541
3cab1e71
AS		 542static noinline_for_stack
543char *special_hex_number(char *buf, char *end, unsigned long long num, int size)
544{
545 struct printf_spec spec;
546
547 spec.type = FORMAT_TYPE_PTR;
548 spec.field_width = 2 + 2 * size; /* 0x + hex */
549 spec.flags = SPECIAL | SMALL | ZEROPAD;
550 spec.base = 16;
551 spec.precision = -1;
552
553 return number(buf, end, num, spec);
554}
555
cfccde04 556static void move_right(char *buf, char *end, unsigned len, unsigned spaces)
4b6ccca7
AV		 557{
558 size_t size;
559 if (buf >= end) /* nowhere to put anything */
560 return;
561 size = end - buf;
562 if (size <= spaces) {
563 memset(buf, ' ', size);
564 return;
565 }
566 if (len) {
567 if (len > size - spaces)
568 len = size - spaces;
569 memmove(buf + spaces, buf, len);
570 }
571 memset(buf, ' ', spaces);
572}
573
cfccde04
RV		 574/*
575 * Handle field width padding for a string.
576 * @buf: current buffer position
577 * @n: length of string
578 * @end: end of output buffer
579 * @spec: for field width and flags
580 * Returns: new buffer position after padding.
581 */
582static noinline_for_stack
583char *widen_string(char *buf, int n, char *end, struct printf_spec spec)
584{
585 unsigned spaces;
586
587 if (likely(n >= spec.field_width))
588 return buf;
589 /* we want to pad the sucker */
590 spaces = spec.field_width - n;
591 if (!(spec.flags & LEFT)) {
592 move_right(buf - n, end, n, spaces);
593 return buf + spaces;
594 }
595 while (spaces--) {
596 if (buf < end)
597 *buf = ' ';
598 ++buf;
599 }
600 return buf;
601}
602
d529ac41
PM		 603/* Handle string from a well known address. */
604static char *string_nocheck(char *buf, char *end, const char *s,
605 struct printf_spec spec)
95508cfa 606{
34fc8b90 607 int len = 0;
b314dd49 608 int lim = spec.precision;
95508cfa 609
34fc8b90
RV		 610 while (lim--) {
611 char c = *s++;
612 if (!c)
613 break;
95508cfa 614 if (buf < end)
34fc8b90 615 *buf = c;
95508cfa 616 ++buf;
34fc8b90 617 ++len;
95508cfa 618 }
34fc8b90 619 return widen_string(buf, len, end, spec);
95508cfa
RV		 620}
621
57f5677e
RV		 622static char *err_ptr(char *buf, char *end, void *ptr,
623 struct printf_spec spec)
624{
625 int err = PTR_ERR(ptr);
626 const char *sym = errname(err);
627
628 if (sym)
629 return string_nocheck(buf, end, sym, spec);
630
631 /*
632 * Somebody passed ERR_PTR(-1234) or some other non-existing
633 * Efoo - or perhaps CONFIG_SYMBOLIC_ERRNAME=n. Fall back to
634 * printing it as its decimal representation.
635 */
636 spec.flags |= SIGN;
637 spec.base = 10;
638 return number(buf, end, err, spec);
639}
640
c8c3b584
PM		 641/* Be careful: error messages must fit into the given buffer. */
642static char *error_string(char *buf, char *end, const char *s,
643 struct printf_spec spec)
644{
645 /*
646 * Hard limit to avoid a completely insane messages. It actually
647 * works pretty well because most error messages are in
648 * the many pointer format modifiers.
649 */
650 if (spec.precision == -1)
651 spec.precision = 2 * sizeof(void *);
652
653 return string_nocheck(buf, end, s, spec);
654}
655
3e5903eb 656/*
2ac5a3bf
PM		 657 * Do not call any complex external code here. Nested printk()/vsprintf()
658 * might cause infinite loops. Failures might break printk() and would
659 * be hard to debug.
3e5903eb
PM		 660 */
661static const char *check_pointer_msg(const void *ptr)
662{
3e5903eb
PM		 663 if (!ptr)
664 return "(null)";
665
2ac5a3bf 666 if ((unsigned long)ptr < PAGE_SIZE || IS_ERR_VALUE(ptr))
3e5903eb
PM		 667 return "(efault)";
668
669 return NULL;
670}
671
672static int check_pointer(char **buf, char *end, const void *ptr,
673 struct printf_spec spec)
674{
675 const char *err_msg;
676
677 err_msg = check_pointer_msg(ptr);
678 if (err_msg) {
c8c3b584 679 *buf = error_string(*buf, end, err_msg, spec);
3e5903eb
PM		 680 return -EFAULT;
681 }
682
683 return 0;
684}
685
9073dac1 686static noinline_for_stack
d529ac41
PM		 687char *string(char *buf, char *end, const char *s,
688 struct printf_spec spec)
689{
3e5903eb
PM		 690 if (check_pointer(&buf, end, s, spec))
691 return buf;
d529ac41
PM		 692
693 return string_nocheck(buf, end, s, spec);
694}
695
ce9d3ece
Y		 696static char *pointer_string(char *buf, char *end,
697 const void *ptr,
698 struct printf_spec spec)
9073dac1
GU		 699{
700 spec.base = 16;
701 spec.flags |= SMALL;
702 if (spec.field_width == -1) {
703 spec.field_width = 2 * sizeof(ptr);
704 spec.flags |= ZEROPAD;
705 }
706
707 return number(buf, end, (unsigned long int)ptr, spec);
708}
709
710/* Make pointers available for printing early in the boot sequence. */
711static int debug_boot_weak_hash __ro_after_init;
712
713static int __init debug_boot_weak_hash_enable(char *str)
714{
715 debug_boot_weak_hash = 1;
716 pr_info("debug_boot_weak_hash enabled\n");
717 return 0;
718}
719early_param("debug_boot_weak_hash", debug_boot_weak_hash_enable);
720
721static DEFINE_STATIC_KEY_TRUE(not_filled_random_ptr_key);
722static siphash_key_t ptr_key __read_mostly;
723
724static void enable_ptr_key_workfn(struct work_struct *work)
725{
726 get_random_bytes(&ptr_key, sizeof(ptr_key));
727 /* Needs to run from preemptible context */
728 static_branch_disable(&not_filled_random_ptr_key);
729}
730
731static DECLARE_WORK(enable_ptr_key_work, enable_ptr_key_workfn);
732
733static void fill_random_ptr_key(struct random_ready_callback *unused)
734{
735 /* This may be in an interrupt handler. */
736 queue_work(system_unbound_wq, &enable_ptr_key_work);
737}
738
739static struct random_ready_callback random_ready = {
740 .func = fill_random_ptr_key
741};
742
743static int __init initialize_ptr_random(void)
744{
745 int key_size = sizeof(ptr_key);
746 int ret;
747
748 /* Use hw RNG if available. */
749 if (get_random_bytes_arch(&ptr_key, key_size) == key_size) {
750 static_branch_disable(&not_filled_random_ptr_key);
751 return 0;
752 }
753
754 ret = add_random_ready_callback(&random_ready);
755 if (!ret) {
756 return 0;
757 } else if (ret == -EALREADY) {
758 /* This is in preemptible context */
759 enable_ptr_key_workfn(&enable_ptr_key_work);
760 return 0;
761 }
762
763 return ret;
764}
765early_initcall(initialize_ptr_random);
766
767/* Maps a pointer to a 32 bit unique identifier. */
e4dcad20
JFG		 768static inline int __ptr_to_hashval(const void *ptr, unsigned long *hashval_out)
769{
770 unsigned long hashval;
771
772 if (static_branch_unlikely(&not_filled_random_ptr_key))
773 return -EAGAIN;
774
775#ifdef CONFIG_64BIT
776 hashval = (unsigned long)siphash_1u64((u64)ptr, &ptr_key);
777 /*
778 * Mask off the first 32 bits, this makes explicit that we have
779 * modified the address (and 32 bits is plenty for a unique ID).
780 */
781 hashval = hashval & 0xffffffff;
782#else
783 hashval = (unsigned long)siphash_1u32((u32)ptr, &ptr_key);
784#endif
785 *hashval_out = hashval;
786 return 0;
787}
788
789int ptr_to_hashval(const void *ptr, unsigned long *hashval_out)
790{
791 return __ptr_to_hashval(ptr, hashval_out);
792}
793
9073dac1
GU		 794static char *ptr_to_id(char *buf, char *end, const void *ptr,
795 struct printf_spec spec)
796{
797 const char *str = sizeof(ptr) == 8 ? "(____ptrval____)" : "(ptrval)";
798 unsigned long hashval;
e4dcad20 799 int ret;
9073dac1 800
7bd57fbc
ID		 801 /*
802 * Print the real pointer value for NULL and error pointers,
803 * as they are not actual addresses.
804 */
805 if (IS_ERR_OR_NULL(ptr))
806 return pointer_string(buf, end, ptr, spec);
807
9073dac1
GU		 808 /* When debugging early boot use non-cryptographically secure hash. */
809 if (unlikely(debug_boot_weak_hash)) {
810 hashval = hash_long((unsigned long)ptr, 32);
811 return pointer_string(buf, end, (const void *)hashval, spec);
812 }
813
e4dcad20
JFG		 814 ret = __ptr_to_hashval(ptr, &hashval);
815 if (ret) {
9073dac1
GU		 816 spec.field_width = 2 * sizeof(ptr);
817 /* string length must be less than default_width */
c8c3b584 818 return error_string(buf, end, str, spec);
9073dac1
GU		 819 }
820
9073dac1
GU		 821 return pointer_string(buf, end, (const void *)hashval, spec);
822}
823
6eea242f
PM		 824int kptr_restrict __read_mostly;
825
826static noinline_for_stack
827char *restricted_pointer(char *buf, char *end, const void *ptr,
828 struct printf_spec spec)
829{
830 switch (kptr_restrict) {
831 case 0:
1ac2f978
PM		 832 /* Handle as %p, hash and do _not_ leak addresses. */
833 return ptr_to_id(buf, end, ptr, spec);
6eea242f
PM		 834 case 1: {
835 const struct cred *cred;
836
837 /*
838 * kptr_restrict==1 cannot be used in IRQ context
839 * because its test for CAP_SYSLOG would be meaningless.
840 */
841 if (in_irq() || in_serving_softirq() || in_nmi()) {
842 if (spec.field_width == -1)
843 spec.field_width = 2 * sizeof(ptr);
c8c3b584 844 return error_string(buf, end, "pK-error", spec);
6eea242f
PM		 845 }
846
847 /*
848 * Only print the real pointer value if the current
849 * process has CAP_SYSLOG and is running with the
850 * same credentials it started with. This is because
851 * access to files is checked at open() time, but %pK
852 * checks permission at read() time. We don't want to
853 * leak pointer values if a binary opens a file using
854 * %pK and then elevates privileges before reading it.
855 */
856 cred = current_cred();
857 if (!has_capability_noaudit(current, CAP_SYSLOG) ||
858 !uid_eq(cred->euid, cred->uid) ||
859 !gid_eq(cred->egid, cred->gid))
860 ptr = NULL;
861 break;
862 }
863 case 2:
864 default:
865 /* Always print 0's for %pK */
866 ptr = NULL;
867 break;
868 }
869
870 return pointer_string(buf, end, ptr, spec);
871}
872
4b6ccca7
AV		 873static noinline_for_stack
874char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec,
875 const char *fmt)
876{
877 const char *array[4], *s;
878 const struct dentry *p;
879 int depth;
880 int i, n;
881
882 switch (fmt[1]) {
883 case '2': case '3': case '4':
884 depth = fmt[1] - '0';
885 break;
886 default:
887 depth = 1;
888 }
889
890 rcu_read_lock();
891 for (i = 0; i < depth; i++, d = p) {
3e5903eb
PM		 892 if (check_pointer(&buf, end, d, spec)) {
893 rcu_read_unlock();
894 return buf;
895 }
896
6aa7de05
MR		 897 p = READ_ONCE(d->d_parent);
898 array[i] = READ_ONCE(d->d_name.name);
4b6ccca7
AV		 899 if (p == d) {
900 if (i)
901 array[i] = "";
902 i++;
903 break;
904 }
905 }
906 s = array[--i];
907 for (n = 0; n != spec.precision; n++, buf++) {
908 char c = *s++;
909 if (!c) {
910 if (!i)
911 break;
912 c = '/';
913 s = array[--i];
914 }
915 if (buf < end)
916 *buf = c;
917 }
918 rcu_read_unlock();
cfccde04 919 return widen_string(buf, n, end, spec);
4b6ccca7
AV		 920}
921
36594b31
JH		 922static noinline_for_stack
923char *file_dentry_name(char *buf, char *end, const struct file *f,
924 struct printf_spec spec, const char *fmt)
925{
926 if (check_pointer(&buf, end, f, spec))
927 return buf;
928
929 return dentry_name(buf, end, f->f_path.dentry, spec, fmt);
930}
1031bc58
DM		 931#ifdef CONFIG_BLOCK
932static noinline_for_stack
933char *bdev_name(char *buf, char *end, struct block_device *bdev,
934 struct printf_spec spec, const char *fmt)
935{
3e5903eb
PM		 936 struct gendisk *hd;
937
938 if (check_pointer(&buf, end, bdev, spec))
939 return buf;
940
941 hd = bdev->bd_disk;
1031bc58 942 buf = string(buf, end, hd->disk_name, spec);
700cd59d 943 if (bdev->bd_partno) {
1031bc58
DM		 944 if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) {
945 if (buf < end)
946 *buf = 'p';
947 buf++;
948 }
700cd59d 949 buf = number(buf, end, bdev->bd_partno, spec);
1031bc58
DM		 950 }
951 return buf;
952}
953#endif
954
cf3b429b
JP		 955static noinline_for_stack
956char *symbol_string(char *buf, char *end, void *ptr,
b0d33c2b 957 struct printf_spec spec, const char *fmt)
0fe1ef24 958{
b0d33c2b 959 unsigned long value;
0fe1ef24
LT		 960#ifdef CONFIG_KALLSYMS
961 char sym[KSYM_SYMBOL_LEN];
b0d33c2b
JP		 962#endif
963
964 if (fmt[1] == 'R')
965 ptr = __builtin_extract_return_addr(ptr);
966 value = (unsigned long)ptr;
967
968#ifdef CONFIG_KALLSYMS
969 if (*fmt == 'B')
0f77a8d3 970 sprint_backtrace(sym, value);
9af77064 971 else if (*fmt != 's')
0c8b946e
FW		 972 sprint_symbol(sym, value);
973 else
4796dd20 974 sprint_symbol_no_offset(sym, value);
7b9186f5 975
d529ac41 976 return string_nocheck(buf, end, sym, spec);
0fe1ef24 977#else
3cab1e71 978 return special_hex_number(buf, end, value, sizeof(void *));
0fe1ef24
LT		 979#endif
980}
981
abd4fe62
AS		 982static const struct printf_spec default_str_spec = {
983 .field_width = -1,
984 .precision = -1,
985};
986
54433973
AS		 987static const struct printf_spec default_flag_spec = {
988 .base = 16,
989 .precision = -1,
990 .flags = SPECIAL | SMALL,
991};
992
ce0b4910
AS		 993static const struct printf_spec default_dec_spec = {
994 .base = 10,
995 .precision = -1,
996};
997
4d42c447
AS		 998static const struct printf_spec default_dec02_spec = {
999 .base = 10,
1000 .field_width = 2,
1001 .precision = -1,
1002 .flags = ZEROPAD,
1003};
1004
1005static const struct printf_spec default_dec04_spec = {
1006 .base = 10,
1007 .field_width = 4,
1008 .precision = -1,
1009 .flags = ZEROPAD,
1010};
1011
cf3b429b
JP		 1012static noinline_for_stack
1013char *resource_string(char *buf, char *end, struct resource *res,
1014 struct printf_spec spec, const char *fmt)
332d2e78
LT		 1015{
1016#ifndef IO_RSRC_PRINTK_SIZE
28405372 1017#define IO_RSRC_PRINTK_SIZE 6
332d2e78
LT		 1018#endif
1019
1020#ifndef MEM_RSRC_PRINTK_SIZE
28405372 1021#define MEM_RSRC_PRINTK_SIZE 10
332d2e78 1022#endif
4da0b66c 1023 static const struct printf_spec io_spec = {
fef20d9c 1024 .base = 16,
4da0b66c 1025 .field_width = IO_RSRC_PRINTK_SIZE,
fef20d9c
FW		 1026 .precision = -1,
1027 .flags = SPECIAL | SMALL | ZEROPAD,
1028 };
4da0b66c
BH		 1029 static const struct printf_spec mem_spec = {
1030 .base = 16,
1031 .field_width = MEM_RSRC_PRINTK_SIZE,
1032 .precision = -1,
1033 .flags = SPECIAL | SMALL | ZEROPAD,
1034 };
0f4050c7
BH		 1035 static const struct printf_spec bus_spec = {
1036 .base = 16,
1037 .field_width = 2,
1038 .precision = -1,
1039 .flags = SMALL | ZEROPAD,
1040 };
4da0b66c 1041 static const struct printf_spec str_spec = {
fd95541e
BH		 1042 .field_width = -1,
1043 .precision = 10,
1044 .flags = LEFT,
1045 };
c7dabef8
BH		 1046
1047 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
1048 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
1049#define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
1050#define FLAG_BUF_SIZE (2 * sizeof(res->flags))
9d7cca04 1051#define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
c7dabef8
BH		 1052#define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
1053 char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
1054 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
1055
332d2e78 1056 char *p = sym, *pend = sym + sizeof(sym);
c7dabef8 1057 int decode = (fmt[0] == 'R') ? 1 : 0;
4da0b66c 1058 const struct printf_spec *specp;
332d2e78 1059
3e5903eb
PM		 1060 if (check_pointer(&buf, end, res, spec))
1061 return buf;
1062
332d2e78 1063 *p++ = '[';
4da0b66c 1064 if (res->flags & IORESOURCE_IO) {
d529ac41 1065 p = string_nocheck(p, pend, "io ", str_spec);
4da0b66c
BH		 1066 specp = &io_spec;
1067 } else if (res->flags & IORESOURCE_MEM) {
d529ac41 1068 p = string_nocheck(p, pend, "mem ", str_spec);
4da0b66c
BH		 1069 specp = &mem_spec;
1070 } else if (res->flags & IORESOURCE_IRQ) {
d529ac41 1071 p = string_nocheck(p, pend, "irq ", str_spec);
ce0b4910 1072 specp = &default_dec_spec;
4da0b66c 1073 } else if (res->flags & IORESOURCE_DMA) {
d529ac41 1074 p = string_nocheck(p, pend, "dma ", str_spec);
ce0b4910 1075 specp = &default_dec_spec;
0f4050c7 1076 } else if (res->flags & IORESOURCE_BUS) {
d529ac41 1077 p = string_nocheck(p, pend, "bus ", str_spec);
0f4050c7 1078 specp = &bus_spec;
4da0b66c 1079 } else {
d529ac41 1080 p = string_nocheck(p, pend, "??? ", str_spec);
4da0b66c 1081 specp = &mem_spec;
c7dabef8 1082 decode = 0;
fd95541e 1083 }
d19cb803 1084 if (decode && res->flags & IORESOURCE_UNSET) {
d529ac41 1085 p = string_nocheck(p, pend, "size ", str_spec);
d19cb803
BH		 1086 p = number(p, pend, resource_size(res), *specp);
1087 } else {
1088 p = number(p, pend, res->start, *specp);
1089 if (res->start != res->end) {
1090 *p++ = '-';
1091 p = number(p, pend, res->end, *specp);
1092 }
c91d3376 1093 }
c7dabef8 1094 if (decode) {
fd95541e 1095 if (res->flags & IORESOURCE_MEM_64)
d529ac41 1096 p = string_nocheck(p, pend, " 64bit", str_spec);
fd95541e 1097 if (res->flags & IORESOURCE_PREFETCH)
d529ac41 1098 p = string_nocheck(p, pend, " pref", str_spec);
9d7cca04 1099 if (res->flags & IORESOURCE_WINDOW)
d529ac41 1100 p = string_nocheck(p, pend, " window", str_spec);
fd95541e 1101 if (res->flags & IORESOURCE_DISABLED)
d529ac41 1102 p = string_nocheck(p, pend, " disabled", str_spec);
c7dabef8 1103 } else {
d529ac41 1104 p = string_nocheck(p, pend, " flags ", str_spec);
54433973 1105 p = number(p, pend, res->flags, default_flag_spec);
fd95541e 1106 }
332d2e78 1107 *p++ = ']';
c7dabef8 1108 *p = '\0';
332d2e78 1109
d529ac41 1110 return string_nocheck(buf, end, sym, spec);
332d2e78
LT		 1111}
1112
31550a16
AS		 1113static noinline_for_stack
1114char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
1115 const char *fmt)
1116{
360603a1 1117 int i, len = 1; /* if we pass '%ph[CDN]', field width remains
31550a16
AS		 1118 negative value, fallback to the default */
1119 char separator;
1120
1121 if (spec.field_width == 0)
1122 /* nothing to print */
1123 return buf;
1124
3e5903eb
PM		 1125 if (check_pointer(&buf, end, addr, spec))
1126 return buf;
31550a16
AS		 1127
1128 switch (fmt[1]) {
1129 case 'C':
1130 separator = ':';
1131 break;
1132 case 'D':
1133 separator = '-';
1134 break;
1135 case 'N':
1136 separator = 0;
1137 break;
1138 default:
1139 separator = ' ';
1140 break;
1141 }
1142
1143 if (spec.field_width > 0)
1144 len = min_t(int, spec.field_width, 64);
1145
9c98f235
RV		 1146 for (i = 0; i < len; ++i) {
1147 if (buf < end)
1148 *buf = hex_asc_hi(addr[i]);
1149 ++buf;
1150 if (buf < end)
1151 *buf = hex_asc_lo(addr[i]);
1152 ++buf;
31550a16 1153
9c98f235
RV		 1154 if (separator && i != len - 1) {
1155 if (buf < end)
1156 *buf = separator;
1157 ++buf;
1158 }
31550a16
AS		 1159 }
1160
1161 return buf;
1162}
1163
dbc760bc
TH		 1164static noinline_for_stack
1165char *bitmap_string(char *buf, char *end, unsigned long *bitmap,
1166 struct printf_spec spec, const char *fmt)
1167{
1168 const int CHUNKSZ = 32;
1169 int nr_bits = max_t(int, spec.field_width, 0);
1170 int i, chunksz;
1171 bool first = true;
1172
3e5903eb
PM		 1173 if (check_pointer(&buf, end, bitmap, spec))
1174 return buf;
1175
dbc760bc
TH		 1176 /* reused to print numbers */
1177 spec = (struct printf_spec){ .flags = SMALL | ZEROPAD, .base = 16 };
1178
1179 chunksz = nr_bits & (CHUNKSZ - 1);
1180 if (chunksz == 0)
1181 chunksz = CHUNKSZ;
1182
1183 i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ;
1184 for (; i >= 0; i -= CHUNKSZ) {
1185 u32 chunkmask, val;
1186 int word, bit;
1187
1188 chunkmask = ((1ULL << chunksz) - 1);
1189 word = i / BITS_PER_LONG;
1190 bit = i % BITS_PER_LONG;
1191 val = (bitmap[word] >> bit) & chunkmask;
1192
1193 if (!first) {
1194 if (buf < end)
1195 *buf = ',';
1196 buf++;
1197 }
1198 first = false;
1199
1200 spec.field_width = DIV_ROUND_UP(chunksz, 4);
1201 buf = number(buf, end, val, spec);
1202
1203 chunksz = CHUNKSZ;
1204 }
1205 return buf;
1206}
1207
1208static noinline_for_stack
1209char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap,
1210 struct printf_spec spec, const char *fmt)
1211{
1212 int nr_bits = max_t(int, spec.field_width, 0);
1213 /* current bit is 'cur', most recently seen range is [rbot, rtop] */
1214 int cur, rbot, rtop;
1215 bool first = true;
1216
3e5903eb
PM		 1217 if (check_pointer(&buf, end, bitmap, spec))
1218 return buf;
1219
dbc760bc
TH		 1220 rbot = cur = find_first_bit(bitmap, nr_bits);
1221 while (cur < nr_bits) {
1222 rtop = cur;
1223 cur = find_next_bit(bitmap, nr_bits, cur + 1);
1224 if (cur < nr_bits && cur <= rtop + 1)
1225 continue;
1226
1227 if (!first) {
1228 if (buf < end)
1229 *buf = ',';
1230 buf++;
1231 }
1232 first = false;
1233
ce0b4910 1234 buf = number(buf, end, rbot, default_dec_spec);
dbc760bc
TH		 1235 if (rbot < rtop) {
1236 if (buf < end)
1237 *buf = '-';
1238 buf++;
1239
ce0b4910 1240 buf = number(buf, end, rtop, default_dec_spec);
dbc760bc
TH		 1241 }
1242
1243 rbot = cur;
1244 }
1245 return buf;
1246}
1247
cf3b429b
JP		 1248static noinline_for_stack
1249char *mac_address_string(char *buf, char *end, u8 *addr,
1250 struct printf_spec spec, const char *fmt)
dd45c9cf 1251{
8a27f7c9 1252 char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
dd45c9cf
HH		 1253 char *p = mac_addr;
1254 int i;
bc7259a2 1255 char separator;
76597ff9 1256 bool reversed = false;
bc7259a2 1257
3e5903eb
PM		 1258 if (check_pointer(&buf, end, addr, spec))
1259 return buf;
1260
76597ff9
AE		 1261 switch (fmt[1]) {
1262 case 'F':
bc7259a2 1263 separator = '-';
76597ff9
AE		 1264 break;
1265
1266 case 'R':
1267 reversed = true;
4c1ca831 1268 fallthrough;
76597ff9
AE		 1269
1270 default:
bc7259a2 1271 separator = ':';
76597ff9 1272 break;
bc7259a2 1273 }
dd45c9cf
HH		 1274
1275 for (i = 0; i < 6; i++) {
76597ff9
AE		 1276 if (reversed)
1277 p = hex_byte_pack(p, addr[5 - i]);
1278 else
1279 p = hex_byte_pack(p, addr[i]);
1280
8a27f7c9 1281 if (fmt[0] == 'M' && i != 5)
bc7259a2 1282 *p++ = separator;
dd45c9cf
HH		 1283 }
1284 *p = '\0';
1285
d529ac41 1286 return string_nocheck(buf, end, mac_addr, spec);
dd45c9cf
HH		 1287}
1288
cf3b429b
JP		 1289static noinline_for_stack
1290char *ip4_string(char *p, const u8 *addr, const char *fmt)
8a27f7c9
JP		 1291{
1292 int i;
0159f24e
JP		 1293 bool leading_zeros = (fmt[0] == 'i');
1294 int index;
1295 int step;
1296
1297 switch (fmt[2]) {
1298 case 'h':
1299#ifdef __BIG_ENDIAN
1300 index = 0;
1301 step = 1;
1302#else
1303 index = 3;
1304 step = -1;
1305#endif
1306 break;
1307 case 'l':
1308 index = 3;
1309 step = -1;
1310 break;
1311 case 'n':
1312 case 'b':
1313 default:
1314 index = 0;
1315 step = 1;
1316 break;
1317 }
8a27f7c9 1318 for (i = 0; i < 4; i++) {
7c43d9a3 1319 char temp[4] __aligned(2); /* hold each IP quad in reverse order */
133fd9f5 1320 int digits = put_dec_trunc8(temp, addr[index]) - temp;
8a27f7c9
JP		 1321 if (leading_zeros) {
1322 if (digits < 3)
1323 *p++ = '0';
1324 if (digits < 2)
1325 *p++ = '0';
1326 }
1327 /* reverse the digits in the quad */
1328 while (digits--)
1329 *p++ = temp[digits];
1330 if (i < 3)
1331 *p++ = '.';
0159f24e 1332 index += step;
8a27f7c9 1333 }
8a27f7c9 1334 *p = '\0';
7b9186f5 1335
8a27f7c9
JP		 1336 return p;
1337}
1338
cf3b429b
JP		 1339static noinline_for_stack
1340char *ip6_compressed_string(char *p, const char *addr)
689afa7d 1341{
7b9186f5 1342 int i, j, range;
8a27f7c9
JP		 1343 unsigned char zerolength[8];
1344 int longest = 1;
1345 int colonpos = -1;
1346 u16 word;
7b9186f5 1347 u8 hi, lo;
8a27f7c9 1348 bool needcolon = false;
eb78cd26
JP		 1349 bool useIPv4;
1350 struct in6_addr in6;
1351
1352 memcpy(&in6, addr, sizeof(struct in6_addr));
1353
1354 useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
8a27f7c9
JP		 1355
1356 memset(zerolength, 0, sizeof(zerolength));
1357
1358 if (useIPv4)
1359 range = 6;
1360 else
1361 range = 8;
1362
1363 /* find position of longest 0 run */
1364 for (i = 0; i < range; i++) {
1365 for (j = i; j < range; j++) {
eb78cd26 1366 if (in6.s6_addr16[j] != 0)
8a27f7c9
JP		 1367 break;
1368 zerolength[i]++;
1369 }
1370 }
1371 for (i = 0; i < range; i++) {
1372 if (zerolength[i] > longest) {
1373 longest = zerolength[i];
1374 colonpos = i;
1375 }
1376 }
29cf519e
JP		 1377 if (longest == 1) /* don't compress a single 0 */
1378 colonpos = -1;
689afa7d 1379
8a27f7c9
JP		 1380 /* emit address */
1381 for (i = 0; i < range; i++) {
1382 if (i == colonpos) {
1383 if (needcolon || i == 0)
1384 *p++ = ':';
1385 *p++ = ':';
1386 needcolon = false;
1387 i += longest - 1;
1388 continue;
1389 }
1390 if (needcolon) {
1391 *p++ = ':';
1392 needcolon = false;
1393 }
1394 /* hex u16 without leading 0s */
eb78cd26 1395 word = ntohs(in6.s6_addr16[i]);
8a27f7c9
JP		 1396 hi = word >> 8;
1397 lo = word & 0xff;
1398 if (hi) {
1399 if (hi > 0x0f)
55036ba7 1400 p = hex_byte_pack(p, hi);
8a27f7c9
JP		 1401 else
1402 *p++ = hex_asc_lo(hi);
55036ba7 1403 p = hex_byte_pack(p, lo);
8a27f7c9 1404 }
b5ff992b 1405 else if (lo > 0x0f)
55036ba7 1406 p = hex_byte_pack(p, lo);
8a27f7c9
JP		 1407 else
1408 *p++ = hex_asc_lo(lo);
1409 needcolon = true;
1410 }
1411
1412 if (useIPv4) {
1413 if (needcolon)
1414 *p++ = ':';
0159f24e 1415 p = ip4_string(p, &in6.s6_addr[12], "I4");
8a27f7c9 1416 }
8a27f7c9 1417 *p = '\0';
7b9186f5 1418
8a27f7c9
JP		 1419 return p;
1420}
1421
cf3b429b
JP		 1422static noinline_for_stack
1423char *ip6_string(char *p, const char *addr, const char *fmt)
8a27f7c9
JP		 1424{
1425 int i;
7b9186f5 1426
689afa7d 1427 for (i = 0; i < 8; i++) {
55036ba7
AS		 1428 p = hex_byte_pack(p, *addr++);
1429 p = hex_byte_pack(p, *addr++);
8a27f7c9 1430 if (fmt[0] == 'I' && i != 7)
689afa7d
HH		 1431 *p++ = ':';
1432 }
1433 *p = '\0';
7b9186f5 1434
8a27f7c9
JP		 1435 return p;
1436}
1437
cf3b429b
JP		 1438static noinline_for_stack
1439char *ip6_addr_string(char *buf, char *end, const u8 *addr,
1440 struct printf_spec spec, const char *fmt)
8a27f7c9
JP		 1441{
1442 char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
1443
1444 if (fmt[0] == 'I' && fmt[2] == 'c')
eb78cd26 1445 ip6_compressed_string(ip6_addr, addr);
8a27f7c9 1446 else
eb78cd26 1447 ip6_string(ip6_addr, addr, fmt);
689afa7d 1448
d529ac41 1449 return string_nocheck(buf, end, ip6_addr, spec);
689afa7d
HH		 1450}
1451
cf3b429b
JP		 1452static noinline_for_stack
1453char *ip4_addr_string(char *buf, char *end, const u8 *addr,
1454 struct printf_spec spec, const char *fmt)
4aa99606 1455{
8a27f7c9 1456 char ip4_addr[sizeof("255.255.255.255")];
4aa99606 1457
0159f24e 1458 ip4_string(ip4_addr, addr, fmt);
4aa99606 1459
d529ac41 1460 return string_nocheck(buf, end, ip4_addr, spec);
4aa99606
HH		 1461}
1462
10679643
DB		 1463static noinline_for_stack
1464char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa,
1465 struct printf_spec spec, const char *fmt)
1466{
1467 bool have_p = false, have_s = false, have_f = false, have_c = false;
1468 char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") +
1469 sizeof(":12345") + sizeof("/123456789") +
1470 sizeof("%1234567890")];
1471 char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr);
1472 const u8 *addr = (const u8 *) &sa->sin6_addr;
1473 char fmt6[2] = { fmt[0], '6' };
1474 u8 off = 0;
1475
1476 fmt++;
1477 while (isalpha(*++fmt)) {
1478 switch (*fmt) {
1479 case 'p':
1480 have_p = true;
1481 break;
1482 case 'f':
1483 have_f = true;
1484 break;
1485 case 's':
1486 have_s = true;
1487 break;
1488 case 'c':
1489 have_c = true;
1490 break;
1491 }
1492 }
1493
1494 if (have_p || have_s || have_f) {
1495 *p = '[';
1496 off = 1;
1497 }
1498
1499 if (fmt6[0] == 'I' && have_c)
1500 p = ip6_compressed_string(ip6_addr + off, addr);
1501 else
1502 p = ip6_string(ip6_addr + off, addr, fmt6);
1503
1504 if (have_p || have_s || have_f)
1505 *p++ = ']';
1506
1507 if (have_p) {
1508 *p++ = ':';
1509 p = number(p, pend, ntohs(sa->sin6_port), spec);
1510 }
1511 if (have_f) {
1512 *p++ = '/';
1513 p = number(p, pend, ntohl(sa->sin6_flowinfo &
1514 IPV6_FLOWINFO_MASK), spec);
1515 }
1516 if (have_s) {
1517 *p++ = '%';
1518 p = number(p, pend, sa->sin6_scope_id, spec);
1519 }
1520 *p = '\0';
1521
d529ac41 1522 return string_nocheck(buf, end, ip6_addr, spec);
10679643
DB		 1523}
1524
1525static noinline_for_stack
1526char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa,
1527 struct printf_spec spec, const char *fmt)
1528{
1529 bool have_p = false;
1530 char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")];
1531 char *pend = ip4_addr + sizeof(ip4_addr);
1532 const u8 *addr = (const u8 *) &sa->sin_addr.s_addr;
1533 char fmt4[3] = { fmt[0], '4', 0 };
1534
1535 fmt++;
1536 while (isalpha(*++fmt)) {
1537 switch (*fmt) {
1538 case 'p':
1539 have_p = true;
1540 break;
1541 case 'h':
1542 case 'l':
1543 case 'n':
1544 case 'b':
1545 fmt4[2] = *fmt;
1546 break;
1547 }
1548 }
1549
1550 p = ip4_string(ip4_addr, addr, fmt4);
1551 if (have_p) {
1552 *p++ = ':';
1553 p = number(p, pend, ntohs(sa->sin_port), spec);
1554 }
1555 *p = '\0';
1556
d529ac41 1557 return string_nocheck(buf, end, ip4_addr, spec);
10679643
DB		 1558}
1559
f00cc102
PM		 1560static noinline_for_stack
1561char *ip_addr_string(char *buf, char *end, const void *ptr,
1562 struct printf_spec spec, const char *fmt)
1563{
0b74d4d7
PM		 1564 char *err_fmt_msg;
1565
3e5903eb
PM		 1566 if (check_pointer(&buf, end, ptr, spec))
1567 return buf;
1568
f00cc102
PM		 1569 switch (fmt[1]) {
1570 case '6':
1571 return ip6_addr_string(buf, end, ptr, spec, fmt);
1572 case '4':
1573 return ip4_addr_string(buf, end, ptr, spec, fmt);
1574 case 'S': {
1575 const union {
1576 struct sockaddr raw;
1577 struct sockaddr_in v4;
1578 struct sockaddr_in6 v6;
1579 } *sa = ptr;
1580
1581 switch (sa->raw.sa_family) {
1582 case AF_INET:
1583 return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt);
1584 case AF_INET6:
1585 return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt);
1586 default:
c8c3b584 1587 return error_string(buf, end, "(einval)", spec);
f00cc102
PM		 1588 }}
1589 }
1590
0b74d4d7 1591 err_fmt_msg = fmt[0] == 'i' ? "(%pi?)" : "(%pI?)";
c8c3b584 1592 return error_string(buf, end, err_fmt_msg, spec);
f00cc102
PM		 1593}
1594
71dca95d
AS		 1595static noinline_for_stack
1596char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
1597 const char *fmt)
1598{
1599 bool found = true;
1600 int count = 1;
1601 unsigned int flags = 0;
1602 int len;
1603
1604 if (spec.field_width == 0)
1605 return buf; /* nothing to print */
1606
3e5903eb
PM		 1607 if (check_pointer(&buf, end, addr, spec))
1608 return buf;
71dca95d
AS		 1609
1610 do {
1611 switch (fmt[count++]) {
1612 case 'a':
1613 flags |= ESCAPE_ANY;
1614 break;
1615 case 'c':
1616 flags |= ESCAPE_SPECIAL;
1617 break;
1618 case 'h':
1619 flags |= ESCAPE_HEX;
1620 break;
1621 case 'n':
1622 flags |= ESCAPE_NULL;
1623 break;
1624 case 'o':
1625 flags |= ESCAPE_OCTAL;
1626 break;
1627 case 'p':
1628 flags |= ESCAPE_NP;
1629 break;
1630 case 's':
1631 flags |= ESCAPE_SPACE;
1632 break;
1633 default:
1634 found = false;
1635 break;
1636 }
1637 } while (found);
1638
1639 if (!flags)
1640 flags = ESCAPE_ANY_NP;
1641
1642 len = spec.field_width < 0 ? 1 : spec.field_width;
1643
41416f23
RV		 1644 /*
1645 * string_escape_mem() writes as many characters as it can to
1646 * the given buffer, and returns the total size of the output
1647 * had the buffer been big enough.
1648 */
1649 buf += string_escape_mem(addr, len, buf, buf < end ? end - buf : 0, flags, NULL);
71dca95d
AS		 1650
1651 return buf;
1652}
1653
3e5903eb
PM		 1654static char *va_format(char *buf, char *end, struct va_format *va_fmt,
1655 struct printf_spec spec, const char *fmt)
45c3e93d
PM		 1656{
1657 va_list va;
1658
3e5903eb
PM		 1659 if (check_pointer(&buf, end, va_fmt, spec))
1660 return buf;
1661
45c3e93d
PM		 1662 va_copy(va, *va_fmt->va);
1663 buf += vsnprintf(buf, end > buf ? end - buf : 0, va_fmt->fmt, va);
1664 va_end(va);
1665
1666 return buf;
1667}
1668
cf3b429b
JP		 1669static noinline_for_stack
1670char *uuid_string(char *buf, char *end, const u8 *addr,
1671 struct printf_spec spec, const char *fmt)
9ac6e44e 1672{
2b1b0d66 1673 char uuid[UUID_STRING_LEN + 1];
9ac6e44e
JP		 1674 char *p = uuid;
1675 int i;
f9727a17 1676 const u8 *index = uuid_index;
9ac6e44e
JP		 1677 bool uc = false;
1678
3e5903eb
PM		 1679 if (check_pointer(&buf, end, addr, spec))
1680 return buf;
1681
9ac6e44e
JP		 1682 switch (*(++fmt)) {
1683 case 'L':
df561f66 1684 uc = true;
4c1ca831 1685 fallthrough;
9ac6e44e 1686 case 'l':
f9727a17 1687 index = guid_index;
9ac6e44e
JP		 1688 break;
1689 case 'B':
1690 uc = true;
1691 break;
1692 }
1693
1694 for (i = 0; i < 16; i++) {
aa4ea1c3
AS		 1695 if (uc)
1696 p = hex_byte_pack_upper(p, addr[index[i]]);
1697 else
1698 p = hex_byte_pack(p, addr[index[i]]);
9ac6e44e
JP		 1699 switch (i) {
1700 case 3:
1701 case 5:
1702 case 7:
1703 case 9:
1704 *p++ = '-';
1705 break;
1706 }
1707 }
1708
1709 *p = 0;
1710
d529ac41 1711 return string_nocheck(buf, end, uuid, spec);
9ac6e44e
JP		 1712}
1713
5b17aecf 1714static noinline_for_stack
431bca24
GU		 1715char *netdev_bits(char *buf, char *end, const void *addr,
1716 struct printf_spec spec, const char *fmt)
c8f44aff 1717{
5b17aecf
AS		 1718 unsigned long long num;
1719 int size;
1720
3e5903eb
PM		 1721 if (check_pointer(&buf, end, addr, spec))
1722 return buf;
1723
5b17aecf
AS		 1724 switch (fmt[1]) {
1725 case 'F':
1726 num = *(const netdev_features_t *)addr;
1727 size = sizeof(netdev_features_t);
1728 break;
1729 default:
c8c3b584 1730 return error_string(buf, end, "(%pN?)", spec);
5b17aecf 1731 }
c8f44aff 1732
3cab1e71 1733 return special_hex_number(buf, end, num, size);
c8f44aff
MM		 1734}
1735
aaf07621 1736static noinline_for_stack
3e5903eb
PM		 1737char *address_val(char *buf, char *end, const void *addr,
1738 struct printf_spec spec, const char *fmt)
aaf07621
JP		 1739{
1740 unsigned long long num;
3cab1e71 1741 int size;
aaf07621 1742
3e5903eb
PM		 1743 if (check_pointer(&buf, end, addr, spec))
1744 return buf;
1745
aaf07621
JP		 1746 switch (fmt[1]) {
1747 case 'd':
1748 num = *(const dma_addr_t *)addr;
3cab1e71 1749 size = sizeof(dma_addr_t);
aaf07621
JP		 1750 break;
1751 case 'p':
1752 default:
1753 num = *(const phys_addr_t *)addr;
3cab1e71 1754 size = sizeof(phys_addr_t);
aaf07621
JP		 1755 break;
1756 }
1757
3cab1e71 1758 return special_hex_number(buf, end, num, size);
aaf07621
JP		 1759}
1760
4d42c447
AS		 1761static noinline_for_stack
1762char *date_str(char *buf, char *end, const struct rtc_time *tm, bool r)
1763{
1764 int year = tm->tm_year + (r ? 0 : 1900);
1765 int mon = tm->tm_mon + (r ? 0 : 1);
1766
1767 buf = number(buf, end, year, default_dec04_spec);
1768 if (buf < end)
1769 *buf = '-';
1770 buf++;
1771
1772 buf = number(buf, end, mon, default_dec02_spec);
1773 if (buf < end)
1774 *buf = '-';
1775 buf++;
1776
1777 return number(buf, end, tm->tm_mday, default_dec02_spec);
1778}
1779
1780static noinline_for_stack
1781char *time_str(char *buf, char *end, const struct rtc_time *tm, bool r)
1782{
1783 buf = number(buf, end, tm->tm_hour, default_dec02_spec);
1784 if (buf < end)
1785 *buf = ':';
1786 buf++;
1787
1788 buf = number(buf, end, tm->tm_min, default_dec02_spec);
1789 if (buf < end)
1790 *buf = ':';
1791 buf++;
1792
1793 return number(buf, end, tm->tm_sec, default_dec02_spec);
1794}
1795
1796static noinline_for_stack
3e5903eb
PM		 1797char *rtc_str(char *buf, char *end, const struct rtc_time *tm,
1798 struct printf_spec spec, const char *fmt)
4d42c447
AS		 1799{
1800 bool have_t = true, have_d = true;
1801 bool raw = false;
1802 int count = 2;
1803
3e5903eb
PM		 1804 if (check_pointer(&buf, end, tm, spec))
1805 return buf;
1806
4d42c447
AS		 1807 switch (fmt[count]) {
1808 case 'd':
1809 have_t = false;
1810 count++;
1811 break;
1812 case 't':
1813 have_d = false;
1814 count++;
1815 break;
1816 }
1817
1818 raw = fmt[count] == 'r';
1819
1820 if (have_d)
1821 buf = date_str(buf, end, tm, raw);
1822 if (have_d && have_t) {
1823 /* Respect ISO 8601 */
1824 if (buf < end)
1825 *buf = 'T';
1826 buf++;
1827 }
1828 if (have_t)
1829 buf = time_str(buf, end, tm, raw);
1830
1831 return buf;
1832}
1833
7daac5b2
AS		 1834static noinline_for_stack
1835char *time64_str(char *buf, char *end, const time64_t time,
1836 struct printf_spec spec, const char *fmt)
1837{
1838 struct rtc_time rtc_time;
1839 struct tm tm;
1840
1841 time64_to_tm(time, 0, &tm);
1842
1843 rtc_time.tm_sec = tm.tm_sec;
1844 rtc_time.tm_min = tm.tm_min;
1845 rtc_time.tm_hour = tm.tm_hour;
1846 rtc_time.tm_mday = tm.tm_mday;
1847 rtc_time.tm_mon = tm.tm_mon;
1848 rtc_time.tm_year = tm.tm_year;
1849 rtc_time.tm_wday = tm.tm_wday;
1850 rtc_time.tm_yday = tm.tm_yday;
1851
1852 rtc_time.tm_isdst = 0;
1853
1854 return rtc_str(buf, end, &rtc_time, spec, fmt);
1855}
1856
4d42c447
AS		 1857static noinline_for_stack
1858char *time_and_date(char *buf, char *end, void *ptr, struct printf_spec spec,
1859 const char *fmt)
1860{
1861 switch (fmt[1]) {
1862 case 'R':
3e5903eb 1863 return rtc_str(buf, end, (const struct rtc_time *)ptr, spec, fmt);
7daac5b2
AS		 1864 case 'T':
1865 return time64_str(buf, end, *(const time64_t *)ptr, spec, fmt);
4d42c447 1866 default:
7daac5b2 1867 return error_string(buf, end, "(%pt?)", spec);
4d42c447
AS		 1868 }
1869}
1870
900cca29
GU		 1871static noinline_for_stack
1872char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec,
1873 const char *fmt)
1874{
0b74d4d7 1875 if (!IS_ENABLED(CONFIG_HAVE_CLK))
c8c3b584 1876 return error_string(buf, end, "(%pC?)", spec);
0b74d4d7 1877
3e5903eb
PM		 1878 if (check_pointer(&buf, end, clk, spec))
1879 return buf;
900cca29
GU		 1880
1881 switch (fmt[1]) {
900cca29
GU		 1882 case 'n':
1883 default:
1884#ifdef CONFIG_COMMON_CLK
1885 return string(buf, end, __clk_get_name(clk), spec);
1886#else
4ca96aa9 1887 return ptr_to_id(buf, end, clk, spec);
900cca29
GU		 1888#endif
1889 }
1890}
1891
edf14cdb
VB		 1892static
1893char *format_flags(char *buf, char *end, unsigned long flags,
1894 const struct trace_print_flags *names)
1895{
1896 unsigned long mask;
edf14cdb
VB		 1897
1898 for ( ; flags && names->name; names++) {
1899 mask = names->mask;
1900 if ((flags & mask) != mask)
1901 continue;
1902
abd4fe62 1903 buf = string(buf, end, names->name, default_str_spec);
edf14cdb
VB		 1904
1905 flags &= ~mask;
1906 if (flags) {
1907 if (buf < end)
1908 *buf = '|';
1909 buf++;
1910 }
1911 }
1912
1913 if (flags)
54433973 1914 buf = number(buf, end, flags, default_flag_spec);
edf14cdb
VB		 1915
1916 return buf;
1917}
1918
c244297a
YS		 1919struct page_flags_fields {
1920 int width;
1921 int shift;
1922 int mask;
1923 const struct printf_spec *spec;
1924 const char *name;
1925};
1926
1927static const struct page_flags_fields pff[] = {
1928 {SECTIONS_WIDTH, SECTIONS_PGSHIFT, SECTIONS_MASK,
1929 &default_dec_spec, "section"},
1930 {NODES_WIDTH, NODES_PGSHIFT, NODES_MASK,
1931 &default_dec_spec, "node"},
1932 {ZONES_WIDTH, ZONES_PGSHIFT, ZONES_MASK,
1933 &default_dec_spec, "zone"},
1934 {LAST_CPUPID_WIDTH, LAST_CPUPID_PGSHIFT, LAST_CPUPID_MASK,
1935 &default_flag_spec, "lastcpupid"},
1936 {KASAN_TAG_WIDTH, KASAN_TAG_PGSHIFT, KASAN_TAG_MASK,
1937 &default_flag_spec, "kasantag"},
1938};
1939
1940static
1941char *format_page_flags(char *buf, char *end, unsigned long flags)
1942{
1943 unsigned long main_flags = flags & (BIT(NR_PAGEFLAGS) - 1);
1944 bool append = false;
1945 int i;
1946
1947 /* Page flags from the main area. */
1948 if (main_flags) {
1949 buf = format_flags(buf, end, main_flags, pageflag_names);
1950 append = true;
1951 }
1952
1953 /* Page flags from the fields area */
1954 for (i = 0; i < ARRAY_SIZE(pff); i++) {
1955 /* Skip undefined fields. */
1956 if (!pff[i].width)
1957 continue;
1958
1959 /* Format: Flag Name + '=' (equals sign) + Number + '|' (separator) */
1960 if (append) {
1961 if (buf < end)
1962 *buf = '|';
1963 buf++;
1964 }
1965
1966 buf = string(buf, end, pff[i].name, default_str_spec);
1967 if (buf < end)
1968 *buf = '=';
1969 buf++;
1970 buf = number(buf, end, (flags >> pff[i].shift) & pff[i].mask,
1971 *pff[i].spec);
1972
1973 append = true;
1974 }
1975
1976 return buf;
1977}
1978
edf14cdb 1979static noinline_for_stack
0b74d4d7
PM		 1980char *flags_string(char *buf, char *end, void *flags_ptr,
1981 struct printf_spec spec, const char *fmt)
edf14cdb
VB		 1982{
1983 unsigned long flags;
1984 const struct trace_print_flags *names;
1985
3e5903eb
PM		 1986 if (check_pointer(&buf, end, flags_ptr, spec))
1987 return buf;
1988
edf14cdb
VB		 1989 switch (fmt[1]) {
1990 case 'p':
c244297a 1991 return format_page_flags(buf, end, *(unsigned long *)flags_ptr);
edf14cdb
VB		 1992 case 'v':
1993 flags = *(unsigned long *)flags_ptr;
1994 names = vmaflag_names;
1995 break;
1996 case 'g':
30d497a0 1997 flags = (__force unsigned long)(*(gfp_t *)flags_ptr);
edf14cdb
VB		 1998 names = gfpflag_names;
1999 break;
2000 default:
c8c3b584 2001 return error_string(buf, end, "(%pG?)", spec);
edf14cdb
VB		 2002 }
2003
2004 return format_flags(buf, end, flags, names);
2005}
2006
ce4fecf1 2007static noinline_for_stack
a92eb762
SA		 2008char *fwnode_full_name_string(struct fwnode_handle *fwnode, char *buf,
2009 char *end)
ce4fecf1
PA		 2010{
2011 int depth;
ce4fecf1 2012
a92eb762
SA		 2013 /* Loop starting from the root node to the current node. */
2014 for (depth = fwnode_count_parents(fwnode); depth >= 0; depth--) {
2015 struct fwnode_handle *__fwnode =
2016 fwnode_get_nth_parent(fwnode, depth);
ce4fecf1 2017
a92eb762 2018 buf = string(buf, end, fwnode_get_name_prefix(__fwnode),
abd4fe62 2019 default_str_spec);
a92eb762 2020 buf = string(buf, end, fwnode_get_name(__fwnode),
abd4fe62 2021 default_str_spec);
a92eb762
SA		 2022
2023 fwnode_handle_put(__fwnode);
ce4fecf1 2024 }
a92eb762 2025
ce4fecf1
PA		 2026 return buf;
2027}
2028
2029static noinline_for_stack
2030char *device_node_string(char *buf, char *end, struct device_node *dn,
2031 struct printf_spec spec, const char *fmt)
2032{
2033 char tbuf[sizeof("xxxx") + 1];
2034 const char *p;
2035 int ret;
2036 char *buf_start = buf;
2037 struct property *prop;
2038 bool has_mult, pass;
ce4fecf1
PA		 2039
2040 struct printf_spec str_spec = spec;
2041 str_spec.field_width = -1;
2042
83abc5a7
SA		 2043 if (fmt[0] != 'F')
2044 return error_string(buf, end, "(%pO?)", spec);
2045
ce4fecf1 2046 if (!IS_ENABLED(CONFIG_OF))
c8c3b584 2047 return error_string(buf, end, "(%pOF?)", spec);
ce4fecf1 2048
3e5903eb
PM		 2049 if (check_pointer(&buf, end, dn, spec))
2050 return buf;
ce4fecf1
PA		 2051
2052 /* simple case without anything any more format specifiers */
2053 fmt++;
2054 if (fmt[0] == '\0' || strcspn(fmt,"fnpPFcC") > 0)
2055 fmt = "f";
2056
2057 for (pass = false; strspn(fmt,"fnpPFcC"); fmt++, pass = true) {
6d0a70a2 2058 int precision;
ce4fecf1
PA		 2059 if (pass) {
2060 if (buf < end)
2061 *buf = ':';
2062 buf++;
2063 }
2064
2065 switch (*fmt) {
2066 case 'f': /* full_name */
a92eb762
SA		 2067 buf = fwnode_full_name_string(of_fwnode_handle(dn), buf,
2068 end);
ce4fecf1
PA		 2069 break;
2070 case 'n': /* name */
a92eb762 2071 p = fwnode_get_name(of_fwnode_handle(dn));
6d0a70a2
RH		 2072 precision = str_spec.precision;
2073 str_spec.precision = strchrnul(p, '@') - p;
2074 buf = string(buf, end, p, str_spec);
2075 str_spec.precision = precision;
ce4fecf1
PA		 2076 break;
2077 case 'p': /* phandle */
09ceb8d7 2078 buf = number(buf, end, (unsigned int)dn->phandle, default_dec_spec);
ce4fecf1
PA		 2079 break;
2080 case 'P': /* path-spec */
a92eb762 2081 p = fwnode_get_name(of_fwnode_handle(dn));
ce4fecf1
PA		 2082 if (!p[1])
2083 p = "/";
2084 buf = string(buf, end, p, str_spec);
2085 break;
2086 case 'F': /* flags */
2087 tbuf[0] = of_node_check_flag(dn, OF_DYNAMIC) ? 'D' : '-';
2088 tbuf[1] = of_node_check_flag(dn, OF_DETACHED) ? 'd' : '-';
2089 tbuf[2] = of_node_check_flag(dn, OF_POPULATED) ? 'P' : '-';
2090 tbuf[3] = of_node_check_flag(dn, OF_POPULATED_BUS) ? 'B' : '-';
2091 tbuf[4] = 0;
d529ac41 2092 buf = string_nocheck(buf, end, tbuf, str_spec);
ce4fecf1
PA		 2093 break;
2094 case 'c': /* major compatible string */
2095 ret = of_property_read_string(dn, "compatible", &p);
2096 if (!ret)
2097 buf = string(buf, end, p, str_spec);
2098 break;
2099 case 'C': /* full compatible string */
2100 has_mult = false;
2101 of_property_for_each_string(dn, "compatible", prop, p) {
2102 if (has_mult)
d529ac41
PM		 2103 buf = string_nocheck(buf, end, ",", str_spec);
2104 buf = string_nocheck(buf, end, "\"", str_spec);
ce4fecf1 2105 buf = string(buf, end, p, str_spec);
d529ac41 2106 buf = string_nocheck(buf, end, "\"", str_spec);
ce4fecf1
PA		 2107
2108 has_mult = true;
2109 }
2110 break;
2111 default:
2112 break;
2113 }
2114 }
2115
2116 return widen_string(buf, buf - buf_start, end, spec);
2117}
2118
3bd32d6a
SA		 2119static noinline_for_stack
2120char *fwnode_string(char *buf, char *end, struct fwnode_handle *fwnode,
2121 struct printf_spec spec, const char *fmt)
798cc27a 2122{
3bd32d6a
SA		 2123 struct printf_spec str_spec = spec;
2124 char *buf_start = buf;
2125
2126 str_spec.field_width = -1;
2127
2128 if (*fmt != 'w')
2129 return error_string(buf, end, "(%pf?)", spec);
2130
2131 if (check_pointer(&buf, end, fwnode, spec))
2132 return buf;
2133
2134 fmt++;
2135
2136 switch (*fmt) {
2137 case 'P': /* name */
2138 buf = string(buf, end, fwnode_get_name(fwnode), str_spec);
2139 break;
2140 case 'f': /* full_name */
2141 default:
2142 buf = fwnode_full_name_string(fwnode, buf, end);
2143 break;
798cc27a
PM		 2144 }
2145
3bd32d6a 2146 return widen_string(buf, buf - buf_start, end, spec);
798cc27a
PM		 2147}
2148
5ead723a
TT		 2149/* Disable pointer hashing if requested */
2150bool no_hash_pointers __ro_after_init;
2151EXPORT_SYMBOL_GPL(no_hash_pointers);
2152
2153static int __init no_hash_pointers_enable(char *str)
2154{
9f961c2e
ME		 2155 if (no_hash_pointers)
2156 return 0;
2157
5ead723a
TT		 2158 no_hash_pointers = true;
2159
2160 pr_warn("**********************************************************\n");
2161 pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n");
2162 pr_warn("** **\n");
2163 pr_warn("** This system shows unhashed kernel memory addresses **\n");
2164 pr_warn("** via the console, logs, and other interfaces. This **\n");
2165 pr_warn("** might reduce the security of your system. **\n");
2166 pr_warn("** **\n");
2167 pr_warn("** If you see this message and you are not debugging **\n");
2168 pr_warn("** the kernel, report this immediately to your system **\n");
2169 pr_warn("** administrator! **\n");
2170 pr_warn("** **\n");
2171 pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n");
2172 pr_warn("**********************************************************\n");
2173
2174 return 0;
2175}
2176early_param("no_hash_pointers", no_hash_pointers_enable);
2177
4d8a743c
LT		 2178/*
2179 * Show a '%p' thing. A kernel extension is that the '%p' is followed
2180 * by an extra set of alphanumeric characters that are extended format
2181 * specifiers.
2182 *
0b523769
JP		 2183 * Please update scripts/checkpatch.pl when adding/removing conversion
2184 * characters. (Search for "check for vsprintf extension").
2185 *
332d2e78
LT		 2186 * Right now we handle:
2187 *
cdb7e52d
SS		 2188 * - 'S' For symbolic direct pointers (or function descriptors) with offset
2189 * - 's' For symbolic direct pointers (or function descriptors) without offset
9af77064 2190 * - '[Ss]R' as above with __builtin_extract_return_addr() translation
1586c5ae
SA		 2191 * - '[Ff]' %pf and %pF were obsoleted and later removed in favor of
2192 * %ps and %pS. Be careful when re-using these specifiers.
0f77a8d3 2193 * - 'B' For backtraced symbolic direct pointers with offset
c7dabef8
BH		 2194 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
2195 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
dbc760bc
TH		 2196 * - 'b[l]' For a bitmap, the number of bits is determined by the field
2197 * width which must be explicitly specified either as part of the
2198 * format string '%32b[l]' or through '%*b[l]', [l] selects
2199 * range-list format instead of hex format
dd45c9cf
HH		 2200 * - 'M' For a 6-byte MAC address, it prints the address in the
2201 * usual colon-separated hex notation
8a27f7c9 2202 * - 'm' For a 6-byte MAC address, it prints the hex address without colons
bc7259a2 2203 * - 'MF' For a 6-byte MAC FDDI address, it prints the address
c8e00060 2204 * with a dash-separated hex notation
7c59154e 2205 * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth)
8a27f7c9
JP		 2206 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
2207 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
2208 * IPv6 uses colon separated network-order 16 bit hex with leading 0's
10679643
DB		 2209 * [S][pfs]
2210 * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
2211 * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
8a27f7c9
JP		 2212 * - 'i' [46] for 'raw' IPv4/IPv6 addresses
2213 * IPv6 omits the colons (01020304...0f)
2214 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
10679643
DB		 2215 * [S][pfs]
2216 * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
2217 * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
2218 * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order
2219 * - 'I[6S]c' for IPv6 addresses printed as specified by
8eda94bd 2220 * https://tools.ietf.org/html/rfc5952
71dca95d
AS		 2221 * - 'E[achnops]' For an escaped buffer, where rules are defined by combination
2222 * of the following flags (see string_escape_mem() for the
2223 * details):
2224 * a - ESCAPE_ANY
2225 * c - ESCAPE_SPECIAL
2226 * h - ESCAPE_HEX
2227 * n - ESCAPE_NULL
2228 * o - ESCAPE_OCTAL
2229 * p - ESCAPE_NP
2230 * s - ESCAPE_SPACE
2231 * By default ESCAPE_ANY_NP is used.
9ac6e44e
JP		 2232 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
2233 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
2234 * Options for %pU are:
2235 * b big endian lower case hex (default)
2236 * B big endian UPPER case hex
2237 * l little endian lower case hex
2238 * L little endian UPPER case hex
2239 * big endian output byte order is:
2240 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
2241 * little endian output byte order is:
2242 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
7db6f5fb
JP		 2243 * - 'V' For a struct va_format which contains a format string * and va_list *,
2244 * call vsnprintf(->format, *->va_list).
2245 * Implements a "recursive vsnprintf".
2246 * Do not use this feature without some mechanism to verify the
2247 * correctness of the format string and va_list arguments.
a48849e2
VB		 2248 * - 'K' For a kernel pointer that should be hidden from unprivileged users.
2249 * Use only for procfs, sysfs and similar files, not printk(); please
2250 * read the documentation (path below) first.
c8f44aff 2251 * - 'NF' For a netdev_features_t
31550a16
AS		 2252 * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with
2253 * a certain separator (' ' by default):
2254 * C colon
2255 * D dash
2256 * N no separator
2257 * The maximum supported length is 64 bytes of the input. Consider
2258 * to use print_hex_dump() for the larger input.
aaf07621
JP		 2259 * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives
2260 * (default assumed to be phys_addr_t, passed by reference)
c0d92a57
OJ		 2261 * - 'd[234]' For a dentry name (optionally 2-4 last components)
2262 * - 'D[234]' Same as 'd' but for a struct file
1031bc58 2263 * - 'g' For block_device name (gendisk + partition number)
7daac5b2 2264 * - 't[RT][dt][r]' For time and date as represented by:
4d42c447 2265 * R struct rtc_time
7daac5b2 2266 * T time64_t
900cca29
GU		 2267 * - 'C' For a clock, it prints the name (Common Clock Framework) or address
2268 * (legacy clock framework) of the clock
2269 * - 'Cn' For a clock, it prints the name (Common Clock Framework) or address
2270 * (legacy clock framework) of the clock
edf14cdb
VB		 2271 * - 'G' For flags to be printed as a collection of symbolic strings that would
2272 * construct the specific value. Supported flags given by option:
2273 * p page flags (see struct page) given as pointer to unsigned long
2274 * g gfp flags (GFP_* and __GFP_*) given as pointer to gfp_t
2275 * v vma flags (VM_*) given as pointer to unsigned long
94ac8f20
GU		 2276 * - 'OF[fnpPcCF]' For a device tree object
2277 * Without any optional arguments prints the full_name
2278 * f device node full_name
2279 * n device node name
2280 * p device node phandle
2281 * P device node path spec (name + @unit)
2282 * F device node flags
2283 * c major compatible string
2284 * C full compatible string
3bd32d6a
SA		 2285 * - 'fw[fP]' For a firmware node (struct fwnode_handle) pointer
2286 * Without an option prints the full name of the node
2287 * f full name
2288 * P node name, including a possible unit address
a48849e2
VB		 2289 * - 'x' For printing the address unmodified. Equivalent to "%lx".
2290 * Please read the documentation (path below) before using!
b2a5212f
DB		 2291 * - '[ku]s' For a BPF/tracing related format specifier, e.g. used out of
2292 * bpf_trace_printk() where [ku] prefix specifies either kernel (k)
2293 * or user (u) memory to probe, and:
2294 * s a string, equivalent to "%s" on direct vsnprintf() use
7b1924a1 2295 *
b3ed2321
TH		 2296 * ** When making changes please also update:
2297 * Documentation/core-api/printk-formats.rst
9ac6e44e 2298 *
ad67b74d
TH		 2299 * Note: The default behaviour (unadorned %p) is to hash the address,
2300 * rendering it useful as a unique identifier.
4d8a743c 2301 */
cf3b429b
JP		 2302static noinline_for_stack
2303char *pointer(const char *fmt, char *buf, char *end, void *ptr,
2304 struct printf_spec spec)
78a8bf69 2305{
0fe1ef24 2306 switch (*fmt) {
0fe1ef24 2307 case 'S':
9ac6e44e 2308 case 's':
04b8eb7a 2309 ptr = dereference_symbol_descriptor(ptr);
4c1ca831 2310 fallthrough;
0f77a8d3 2311 case 'B':
b0d33c2b 2312 return symbol_string(buf, end, ptr, spec, fmt);
332d2e78 2313 case 'R':
c7dabef8 2314 case 'r':
fd95541e 2315 return resource_string(buf, end, ptr, spec, fmt);
31550a16
AS		 2316 case 'h':
2317 return hex_string(buf, end, ptr, spec, fmt);
dbc760bc
TH		 2318 case 'b':
2319 switch (fmt[1]) {
2320 case 'l':
2321 return bitmap_list_string(buf, end, ptr, spec, fmt);
2322 default:
2323 return bitmap_string(buf, end, ptr, spec, fmt);
2324 }
8a27f7c9
JP		 2325 case 'M': /* Colon separated: 00:01:02:03:04:05 */
2326 case 'm': /* Contiguous: 000102030405 */
76597ff9
AE		 2327 /* [mM]F (FDDI) */
2328 /* [mM]R (Reverse order; Bluetooth) */
8a27f7c9
JP		 2329 return mac_address_string(buf, end, ptr, spec, fmt);
2330 case 'I': /* Formatted IP supported
2331 * 4: 1.2.3.4
2332 * 6: 0001:0203:...:0708
2333 * 6c: 1::708 or 1::1.2.3.4
2334 */
2335 case 'i': /* Contiguous:
2336 * 4: 001.002.003.004
2337 * 6: 000102...0f
2338 */
f00cc102 2339 return ip_addr_string(buf, end, ptr, spec, fmt);
71dca95d
AS		 2340 case 'E':
2341 return escaped_string(buf, end, ptr, spec, fmt);
9ac6e44e
JP		 2342 case 'U':
2343 return uuid_string(buf, end, ptr, spec, fmt);
7db6f5fb 2344 case 'V':
3e5903eb 2345 return va_format(buf, end, ptr, spec, fmt);
455cd5ab 2346 case 'K':
57e73442 2347 return restricted_pointer(buf, end, ptr, spec);
c8f44aff 2348 case 'N':
431bca24 2349 return netdev_bits(buf, end, ptr, spec, fmt);
7d799210 2350 case 'a':
3e5903eb 2351 return address_val(buf, end, ptr, spec, fmt);
4b6ccca7
AV		 2352 case 'd':
2353 return dentry_name(buf, end, ptr, spec, fmt);
4d42c447
AS		 2354 case 't':
2355 return time_and_date(buf, end, ptr, spec, fmt);
900cca29
GU		 2356 case 'C':
2357 return clock(buf, end, ptr, spec, fmt);
4b6ccca7 2358 case 'D':
36594b31 2359 return file_dentry_name(buf, end, ptr, spec, fmt);
1031bc58
DM		 2360#ifdef CONFIG_BLOCK
2361 case 'g':
2362 return bdev_name(buf, end, ptr, spec, fmt);
2363#endif
2364
edf14cdb 2365 case 'G':
0b74d4d7 2366 return flags_string(buf, end, ptr, spec, fmt);
ce4fecf1 2367 case 'O':
83abc5a7 2368 return device_node_string(buf, end, ptr, spec, fmt + 1);
3bd32d6a
SA		 2369 case 'f':
2370 return fwnode_string(buf, end, ptr, spec, fmt + 1);
7b1924a1
TH		 2371 case 'x':
2372 return pointer_string(buf, end, ptr, spec);
57f5677e
RV		 2373 case 'e':
2374 /* %pe with a non-ERR_PTR gets treated as plain %p */
2375 if (!IS_ERR(ptr))
2376 break;
2377 return err_ptr(buf, end, ptr, spec);
b2a5212f
DB		 2378 case 'u':
2379 case 'k':
2380 switch (fmt[1]) {
2381 case 's':
2382 return string(buf, end, ptr, spec);
2383 default:
2384 return error_string(buf, end, "(einval)", spec);
2385 }
fef20d9c 2386 }
fef20d9c 2387
5ead723a
TT		 2388 /*
2389 * default is to _not_ leak addresses, so hash before printing,
2390 * unless no_hash_pointers is specified on the command line.
2391 */
2392 if (unlikely(no_hash_pointers))
2393 return pointer_string(buf, end, ptr, spec);
2394 else
2395 return ptr_to_id(buf, end, ptr, spec);
fef20d9c
FW		 2396}
2397
2398/*
2399 * Helper function to decode printf style format.
2400 * Each call decode a token from the format and return the
2401 * number of characters read (or likely the delta where it wants
2402 * to go on the next call).
2403 * The decoded token is returned through the parameters
2404 *
2405 * 'h', 'l', or 'L' for integer fields
2406 * 'z' support added 23/7/1999 S.H.
2407 * 'z' changed to 'Z' --davidm 1/25/99
5b5e0928 2408 * 'Z' changed to 'z' --adobriyan 2017-01-25
fef20d9c
FW		 2409 * 't' added for ptrdiff_t
2410 *
2411 * @fmt: the format string
2412 * @type of the token returned
2413 * @flags: various flags such as +, -, # tokens..
2414 * @field_width: overwritten width
2415 * @base: base of the number (octal, hex, ...)
2416 * @precision: precision of a number
2417 * @qualifier: qualifier of a number (long, size_t, ...)
2418 */
cf3b429b
JP		 2419static noinline_for_stack
2420int format_decode(const char *fmt, struct printf_spec *spec)
fef20d9c
FW		 2421{
2422 const char *start = fmt;
d0484193 2423 char qualifier;
fef20d9c
FW		 2424
2425 /* we finished early by reading the field width */
ed681a91 2426 if (spec->type == FORMAT_TYPE_WIDTH) {
fef20d9c
FW		 2427 if (spec->field_width < 0) {
2428 spec->field_width = -spec->field_width;
2429 spec->flags |= LEFT;
2430 }
2431 spec->type = FORMAT_TYPE_NONE;
2432 goto precision;
2433 }
2434
2435 /* we finished early by reading the precision */
2436 if (spec->type == FORMAT_TYPE_PRECISION) {
2437 if (spec->precision < 0)
2438 spec->precision = 0;
2439
2440 spec->type = FORMAT_TYPE_NONE;
2441 goto qualifier;
2442 }
2443
2444 /* By default */
2445 spec->type = FORMAT_TYPE_NONE;
2446
2447 for (; *fmt ; ++fmt) {
2448 if (*fmt == '%')
2449 break;
2450 }
2451
2452 /* Return the current non-format string */
2453 if (fmt != start || !*fmt)
2454 return fmt - start;
2455
2456 /* Process flags */
2457 spec->flags = 0;
2458
2459 while (1) { /* this also skips first '%' */
2460 bool found = true;
2461
2462 ++fmt;
2463
2464 switch (*fmt) {
2465 case '-': spec->flags |= LEFT; break;
2466 case '+': spec->flags |= PLUS; break;
2467 case ' ': spec->flags |= SPACE; break;
2468 case '#': spec->flags |= SPECIAL; break;
2469 case '0': spec->flags |= ZEROPAD; break;
2470 default: found = false;
2471 }
2472
2473 if (!found)
2474 break;
2475 }
2476
2477 /* get field width */
2478 spec->field_width = -1;
2479
2480 if (isdigit(*fmt))
2481 spec->field_width = skip_atoi(&fmt);
2482 else if (*fmt == '*') {
2483 /* it's the next argument */
ed681a91 2484 spec->type = FORMAT_TYPE_WIDTH;
fef20d9c
FW		 2485 return ++fmt - start;
2486 }
2487
2488precision:
2489 /* get the precision */
2490 spec->precision = -1;
2491 if (*fmt == '.') {
2492 ++fmt;
2493 if (isdigit(*fmt)) {
2494 spec->precision = skip_atoi(&fmt);
2495 if (spec->precision < 0)
2496 spec->precision = 0;
2497 } else if (*fmt == '*') {
2498 /* it's the next argument */
adf26f84 2499 spec->type = FORMAT_TYPE_PRECISION;
fef20d9c
FW		 2500 return ++fmt - start;
2501 }
2502 }
2503
2504qualifier:
2505 /* get the conversion qualifier */
d0484193 2506 qualifier = 0;
75fb8f26 2507 if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
5b5e0928 2508 *fmt == 'z' || *fmt == 't') {
d0484193
RV		 2509 qualifier = *fmt++;
2510 if (unlikely(qualifier == *fmt)) {
2511 if (qualifier == 'l') {
2512 qualifier = 'L';
a4e94ef0 2513 ++fmt;
d0484193
RV		 2514 } else if (qualifier == 'h') {
2515 qualifier = 'H';
a4e94ef0
Z		 2516 ++fmt;
2517 }
fef20d9c
FW		 2518 }
2519 }
2520
2521 /* default base */
2522 spec->base = 10;
2523 switch (*fmt) {
2524 case 'c':
2525 spec->type = FORMAT_TYPE_CHAR;
2526 return ++fmt - start;
2527
2528 case 's':
2529 spec->type = FORMAT_TYPE_STR;
2530 return ++fmt - start;
2531
2532 case 'p':
2533 spec->type = FORMAT_TYPE_PTR;
ffbfed03 2534 return ++fmt - start;
fef20d9c 2535
fef20d9c
FW		 2536 case '%':
2537 spec->type = FORMAT_TYPE_PERCENT_CHAR;
2538 return ++fmt - start;
2539
2540 /* integer number formats - set up the flags and "break" */
2541 case 'o':
2542 spec->base = 8;
2543 break;
2544
2545 case 'x':
2546 spec->flags |= SMALL;
4c1ca831 2547 fallthrough;
fef20d9c
FW		 2548
2549 case 'X':
2550 spec->base = 16;
2551 break;
2552
2553 case 'd':
2554 case 'i':
39e874f8 2555 spec->flags |= SIGN;
36f9ff9e 2556 break;
fef20d9c 2557 case 'u':
4aa99606 2558 break;
fef20d9c 2559
708d96fd
RM		 2560 case 'n':
2561 /*
b006f19b
RV		 2562 * Since %n poses a greater security risk than
2563 * utility, treat it as any other invalid or
2564 * unsupported format specifier.
708d96fd 2565 */
4c1ca831 2566 fallthrough;
708d96fd 2567
fef20d9c 2568 default:
b006f19b 2569 WARN_ONCE(1, "Please remove unsupported %%%c in format string\n", *fmt);
fef20d9c
FW		 2570 spec->type = FORMAT_TYPE_INVALID;
2571 return fmt - start;
0fe1ef24 2572 }
fef20d9c 2573
d0484193 2574 if (qualifier == 'L')
fef20d9c 2575 spec->type = FORMAT_TYPE_LONG_LONG;
d0484193 2576 else if (qualifier == 'l') {
51be17df
RV		 2577 BUILD_BUG_ON(FORMAT_TYPE_ULONG + SIGN != FORMAT_TYPE_LONG);
2578 spec->type = FORMAT_TYPE_ULONG + (spec->flags & SIGN);
5b5e0928 2579 } else if (qualifier == 'z') {
fef20d9c 2580 spec->type = FORMAT_TYPE_SIZE_T;
d0484193 2581 } else if (qualifier == 't') {
fef20d9c 2582 spec->type = FORMAT_TYPE_PTRDIFF;
d0484193 2583 } else if (qualifier == 'H') {
51be17df
RV		 2584 BUILD_BUG_ON(FORMAT_TYPE_UBYTE + SIGN != FORMAT_TYPE_BYTE);
2585 spec->type = FORMAT_TYPE_UBYTE + (spec->flags & SIGN);
d0484193 2586 } else if (qualifier == 'h') {
51be17df
RV		 2587 BUILD_BUG_ON(FORMAT_TYPE_USHORT + SIGN != FORMAT_TYPE_SHORT);
2588 spec->type = FORMAT_TYPE_USHORT + (spec->flags & SIGN);
fef20d9c 2589 } else {
51be17df
RV		 2590 BUILD_BUG_ON(FORMAT_TYPE_UINT + SIGN != FORMAT_TYPE_INT);
2591 spec->type = FORMAT_TYPE_UINT + (spec->flags & SIGN);
78a8bf69 2592 }
fef20d9c
FW		 2593
2594 return ++fmt - start;
78a8bf69
LT		 2595}
2596
4d72ba01
RV		 2597static void
2598set_field_width(struct printf_spec *spec, int width)
2599{
2600 spec->field_width = width;
2601 if (WARN_ONCE(spec->field_width != width, "field width %d too large", width)) {
2602 spec->field_width = clamp(width, -FIELD_WIDTH_MAX, FIELD_WIDTH_MAX);
2603 }
2604}
2605
2606static void
2607set_precision(struct printf_spec *spec, int prec)
2608{
2609 spec->precision = prec;
2610 if (WARN_ONCE(spec->precision != prec, "precision %d too large", prec)) {
2611 spec->precision = clamp(prec, 0, PRECISION_MAX);
2612 }
2613}
2614
1da177e4
LT		 2615/**
2616 * vsnprintf - Format a string and place it in a buffer
2617 * @buf: The buffer to place the result into
2618 * @size: The size of the buffer, including the trailing null space
2619 * @fmt: The format string to use
2620 * @args: Arguments for the format string
2621 *
d7ec9a05
RV		 2622 * This function generally follows C99 vsnprintf, but has some
2623 * extensions and a few limitations:
2624 *
6cc89134 2625 * - ``%n`` is unsupported
2626 * - ``%p*`` is handled by pointer()
5e4ee7b1 2627 *
27e7c0e8 2628 * See pointer() or Documentation/core-api/printk-formats.rst for more
5e4ee7b1 2629 * extensive description.
20036fdc 2630 *
6cc89134 2631 * **Please update the documentation in both places when making changes**
80f548e0 2632 *
1da177e4
LT		 2633 * The return value is the number of characters which would
2634 * be generated for the given input, excluding the trailing
2635 * '\0', as per ISO C99. If you want to have the exact
2636 * number of characters written into @buf as return value
72fd4a35 2637 * (not including the trailing '\0'), use vscnprintf(). If the
1da177e4
LT		 2638 * return is greater than or equal to @size, the resulting
2639 * string is truncated.
2640 *
ba1835eb 2641 * If you're not already dealing with a va_list consider using snprintf().
1da177e4
LT		 2642 */
2643int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
2644{
1da177e4 2645 unsigned long long num;
d4be151b 2646 char *str, *end;
fef20d9c 2647 struct printf_spec spec = {0};
1da177e4 2648
f796937a
JF		 2649 /* Reject out-of-range values early. Large positive sizes are
2650 used for unknown buffer sizes. */
2aa2f9e2 2651 if (WARN_ON_ONCE(size > INT_MAX))
1da177e4 2652 return 0;
1da177e4
LT		 2653
2654 str = buf;
f796937a 2655 end = buf + size;
1da177e4 2656
f796937a
JF		 2657 /* Make sure end is always >= buf */
2658 if (end < buf) {
2659 end = ((void *)-1);
2660 size = end - buf;
1da177e4
LT		 2661 }
2662
fef20d9c
FW		 2663 while (*fmt) {
2664 const char *old_fmt = fmt;
d4be151b 2665 int read = format_decode(fmt, &spec);
1da177e4 2666
fef20d9c 2667 fmt += read;
1da177e4 2668
fef20d9c
FW		 2669 switch (spec.type) {
2670 case FORMAT_TYPE_NONE: {
2671 int copy = read;
2672 if (str < end) {
2673 if (copy > end - str)
2674 copy = end - str;
2675 memcpy(str, old_fmt, copy);
1da177e4 2676 }
fef20d9c
FW		 2677 str += read;
2678 break;
1da177e4
LT		 2679 }
2680
ed681a91 2681 case FORMAT_TYPE_WIDTH:
4d72ba01 2682 set_field_width(&spec, va_arg(args, int));
fef20d9c 2683 break;
1da177e4 2684
fef20d9c 2685 case FORMAT_TYPE_PRECISION:
4d72ba01 2686 set_precision(&spec, va_arg(args, int));
fef20d9c 2687 break;
1da177e4 2688
d4be151b
AGR		 2689 case FORMAT_TYPE_CHAR: {
2690 char c;
2691
fef20d9c
FW		 2692 if (!(spec.flags & LEFT)) {
2693 while (--spec.field_width > 0) {
f796937a 2694 if (str < end)
1da177e4
LT		 2695 *str = ' ';
2696 ++str;
1da177e4 2697
fef20d9c
FW		 2698 }
2699 }
2700 c = (unsigned char) va_arg(args, int);
2701 if (str < end)
2702 *str = c;
2703 ++str;
2704 while (--spec.field_width > 0) {
f796937a 2705 if (str < end)
fef20d9c 2706 *str = ' ';
1da177e4 2707 ++str;
fef20d9c
FW		 2708 }
2709 break;
d4be151b 2710 }
1da177e4 2711
fef20d9c
FW		 2712 case FORMAT_TYPE_STR:
2713 str = string(str, end, va_arg(args, char *), spec);
2714 break;
1da177e4 2715
fef20d9c 2716 case FORMAT_TYPE_PTR:
ffbfed03 2717 str = pointer(fmt, str, end, va_arg(args, void *),
fef20d9c
FW		 2718 spec);
2719 while (isalnum(*fmt))
2720 fmt++;
2721 break;
1da177e4 2722
fef20d9c
FW		 2723 case FORMAT_TYPE_PERCENT_CHAR:
2724 if (str < end)
2725 *str = '%';
2726 ++str;
2727 break;
1da177e4 2728
fef20d9c 2729 case FORMAT_TYPE_INVALID:
b006f19b
RV		 2730 /*
2731 * Presumably the arguments passed gcc's type
2732 * checking, but there is no safe or sane way
2733 * for us to continue parsing the format and
2734 * fetching from the va_list; the remaining
2735 * specifiers and arguments would be out of
2736 * sync.
2737 */
2738 goto out;
fef20d9c 2739
fef20d9c
FW		 2740 default:
2741 switch (spec.type) {
2742 case FORMAT_TYPE_LONG_LONG:
2743 num = va_arg(args, long long);
2744 break;
2745 case FORMAT_TYPE_ULONG:
2746 num = va_arg(args, unsigned long);
2747 break;
2748 case FORMAT_TYPE_LONG:
2749 num = va_arg(args, long);
2750 break;
2751 case FORMAT_TYPE_SIZE_T:
ef124960
JG		 2752 if (spec.flags & SIGN)
2753 num = va_arg(args, ssize_t);
2754 else
2755 num = va_arg(args, size_t);
fef20d9c
FW		 2756 break;
2757 case FORMAT_TYPE_PTRDIFF:
2758 num = va_arg(args, ptrdiff_t);
2759 break;
a4e94ef0
Z		 2760 case FORMAT_TYPE_UBYTE:
2761 num = (unsigned char) va_arg(args, int);
2762 break;
2763 case FORMAT_TYPE_BYTE:
2764 num = (signed char) va_arg(args, int);
2765 break;
fef20d9c
FW		 2766 case FORMAT_TYPE_USHORT:
2767 num = (unsigned short) va_arg(args, int);
2768 break;
2769 case FORMAT_TYPE_SHORT:
2770 num = (short) va_arg(args, int);
2771 break;
39e874f8
FW		 2772 case FORMAT_TYPE_INT:
2773 num = (int) va_arg(args, int);
fef20d9c
FW		 2774 break;
2775 default:
2776 num = va_arg(args, unsigned int);
2777 }
2778
2779 str = number(str, end, num, spec);
1da177e4 2780 }
1da177e4 2781 }
fef20d9c 2782
b006f19b 2783out:
f796937a
JF		 2784 if (size > 0) {
2785 if (str < end)
2786 *str = '\0';
2787 else
0a6047ee 2788 end[-1] = '\0';
f796937a 2789 }
fef20d9c 2790
f796937a 2791 /* the trailing null byte doesn't count towards the total */
1da177e4 2792 return str-buf;
fef20d9c 2793
1da177e4 2794}
1da177e4
LT		 2795EXPORT_SYMBOL(vsnprintf);
2796
2797/**
2798 * vscnprintf - Format a string and place it in a buffer
2799 * @buf: The buffer to place the result into
2800 * @size: The size of the buffer, including the trailing null space
2801 * @fmt: The format string to use
2802 * @args: Arguments for the format string
2803 *
2804 * The return value is the number of characters which have been written into
b921c69f 2805 * the @buf not including the trailing '\0'. If @size is == 0 the function
1da177e4
LT		 2806 * returns 0.
2807 *
ba1835eb 2808 * If you're not already dealing with a va_list consider using scnprintf().
20036fdc
AK		 2809 *
2810 * See the vsnprintf() documentation for format string extensions over C99.
1da177e4
LT		 2811 */
2812int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
2813{
2814 int i;
2815
7b9186f5
AGR		 2816 i = vsnprintf(buf, size, fmt, args);
2817
b921c69f
AA		 2818 if (likely(i < size))
2819 return i;
2820 if (size != 0)
2821 return size - 1;
2822 return 0;
1da177e4 2823}
1da177e4
LT		 2824EXPORT_SYMBOL(vscnprintf);
2825
2826/**
2827 * snprintf - Format a string and place it in a buffer
2828 * @buf: The buffer to place the result into
2829 * @size: The size of the buffer, including the trailing null space
2830 * @fmt: The format string to use
2831 * @...: Arguments for the format string
2832 *
2833 * The return value is the number of characters which would be
2834 * generated for the given input, excluding the trailing null,
2835 * as per ISO C99. If the return is greater than or equal to
2836 * @size, the resulting string is truncated.
20036fdc
AK		 2837 *
2838 * See the vsnprintf() documentation for format string extensions over C99.
1da177e4 2839 */
7b9186f5 2840int snprintf(char *buf, size_t size, const char *fmt, ...)
1da177e4
LT		 2841{
2842 va_list args;
2843 int i;
2844
2845 va_start(args, fmt);
7b9186f5 2846 i = vsnprintf(buf, size, fmt, args);
1da177e4 2847 va_end(args);
7b9186f5 2848
1da177e4
LT		 2849 return i;
2850}
1da177e4
LT		 2851EXPORT_SYMBOL(snprintf);
2852
2853/**
2854 * scnprintf - Format a string and place it in a buffer
2855 * @buf: The buffer to place the result into
2856 * @size: The size of the buffer, including the trailing null space
2857 * @fmt: The format string to use
2858 * @...: Arguments for the format string
2859 *
2860 * The return value is the number of characters written into @buf not including
b903c0b8 2861 * the trailing '\0'. If @size is == 0 the function returns 0.
1da177e4
LT		 2862 */
2863
7b9186f5 2864int scnprintf(char *buf, size_t size, const char *fmt, ...)
1da177e4
LT		 2865{
2866 va_list args;
2867 int i;
2868
2869 va_start(args, fmt);
b921c69f 2870 i = vscnprintf(buf, size, fmt, args);
1da177e4 2871 va_end(args);
7b9186f5 2872
b921c69f 2873 return i;
1da177e4
LT		 2874}
2875EXPORT_SYMBOL(scnprintf);
2876
2877/**
2878 * vsprintf - Format a string and place it in a buffer
2879 * @buf: The buffer to place the result into
2880 * @fmt: The format string to use
2881 * @args: Arguments for the format string
2882 *
2883 * The function returns the number of characters written
72fd4a35 2884 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
1da177e4
LT		 2885 * buffer overflows.
2886 *
ba1835eb 2887 * If you're not already dealing with a va_list consider using sprintf().
20036fdc
AK		 2888 *
2889 * See the vsnprintf() documentation for format string extensions over C99.
1da177e4
LT		 2890 */
2891int vsprintf(char *buf, const char *fmt, va_list args)
2892{
2893 return vsnprintf(buf, INT_MAX, fmt, args);
2894}
1da177e4
LT		 2895EXPORT_SYMBOL(vsprintf);
2896
2897/**
2898 * sprintf - Format a string and place it in a buffer
2899 * @buf: The buffer to place the result into
2900 * @fmt: The format string to use
2901 * @...: Arguments for the format string
2902 *
2903 * The function returns the number of characters written
72fd4a35 2904 * into @buf. Use snprintf() or scnprintf() in order to avoid
1da177e4 2905 * buffer overflows.
20036fdc
AK		 2906 *
2907 * See the vsnprintf() documentation for format string extensions over C99.
1da177e4 2908 */
7b9186f5 2909int sprintf(char *buf, const char *fmt, ...)
1da177e4
LT		 2910{
2911 va_list args;
2912 int i;
2913
2914 va_start(args, fmt);
7b9186f5 2915 i = vsnprintf(buf, INT_MAX, fmt, args);
1da177e4 2916 va_end(args);
7b9186f5 2917
1da177e4
LT		 2918 return i;
2919}
1da177e4
LT		 2920EXPORT_SYMBOL(sprintf);
2921
4370aa4a
LJ		 2922#ifdef CONFIG_BINARY_PRINTF
2923/*
2924 * bprintf service:
2925 * vbin_printf() - VA arguments to binary data
2926 * bstr_printf() - Binary data to text string
2927 */
2928
2929/**
2930 * vbin_printf - Parse a format string and place args' binary value in a buffer
2931 * @bin_buf: The buffer to place args' binary value
2932 * @size: The size of the buffer(by words(32bits), not characters)
2933 * @fmt: The format string to use
2934 * @args: Arguments for the format string
2935 *
2936 * The format follows C99 vsnprintf, except %n is ignored, and its argument
da3dae54 2937 * is skipped.
4370aa4a
LJ		 2938 *
2939 * The return value is the number of words(32bits) which would be generated for
2940 * the given input.
2941 *
2942 * NOTE:
2943 * If the return value is greater than @size, the resulting bin_buf is NOT
2944 * valid for bstr_printf().
2945 */
2946int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
2947{
fef20d9c 2948 struct printf_spec spec = {0};
4370aa4a 2949 char *str, *end;
841a915d 2950 int width;
4370aa4a
LJ		 2951
2952 str = (char *)bin_buf;
2953 end = (char *)(bin_buf + size);
2954
2955#define save_arg(type) \
841a915d
SRV		 2956({ \
2957 unsigned long long value; \
4370aa4a 2958 if (sizeof(type) == 8) { \
841a915d 2959 unsigned long long val8; \
4370aa4a 2960 str = PTR_ALIGN(str, sizeof(u32)); \
841a915d 2961 val8 = va_arg(args, unsigned long long); \
4370aa4a 2962 if (str + sizeof(type) <= end) { \
841a915d
SRV		 2963 *(u32 *)str = *(u32 *)&val8; \
2964 *(u32 *)(str + 4) = *((u32 *)&val8 + 1); \
4370aa4a 2965 } \
841a915d 2966 value = val8; \
4370aa4a 2967 } else { \
841a915d 2968 unsigned int val4; \
4370aa4a 2969 str = PTR_ALIGN(str, sizeof(type)); \
841a915d 2970 val4 = va_arg(args, int); \
4370aa4a 2971 if (str + sizeof(type) <= end) \
841a915d
SRV		 2972 *(typeof(type) *)str = (type)(long)val4; \
2973 value = (unsigned long long)val4; \
4370aa4a
LJ		 2974 } \
2975 str += sizeof(type); \
841a915d
SRV		 2976 value; \
2977})
4370aa4a 2978
fef20d9c 2979 while (*fmt) {
d4be151b 2980 int read = format_decode(fmt, &spec);
4370aa4a 2981
fef20d9c 2982 fmt += read;
4370aa4a 2983
fef20d9c
FW		 2984 switch (spec.type) {
2985 case FORMAT_TYPE_NONE:
d4be151b 2986 case FORMAT_TYPE_PERCENT_CHAR:
fef20d9c 2987 break;
b006f19b
RV		 2988 case FORMAT_TYPE_INVALID:
2989 goto out;
fef20d9c 2990
ed681a91 2991 case FORMAT_TYPE_WIDTH:
fef20d9c 2992 case FORMAT_TYPE_PRECISION:
841a915d
SRV		 2993 width = (int)save_arg(int);
2994 /* Pointers may require the width */
2995 if (*fmt == 'p')
2996 set_field_width(&spec, width);
fef20d9c
FW		 2997 break;
2998
2999 case FORMAT_TYPE_CHAR:
4370aa4a 3000 save_arg(char);
fef20d9c
FW		 3001 break;
3002
3003 case FORMAT_TYPE_STR: {
4370aa4a 3004 const char *save_str = va_arg(args, char *);
3e5903eb 3005 const char *err_msg;
4370aa4a 3006 size_t len;
6c356634 3007
3e5903eb
PM		 3008 err_msg = check_pointer_msg(save_str);
3009 if (err_msg)
3010 save_str = err_msg;
3011
6c356634
AGR		 3012 len = strlen(save_str) + 1;
3013 if (str + len < end)
3014 memcpy(str, save_str, len);
3015 str += len;
fef20d9c 3016 break;
4370aa4a 3017 }
fef20d9c
FW		 3018
3019 case FORMAT_TYPE_PTR:
841a915d
SRV		 3020 /* Dereferenced pointers must be done now */
3021 switch (*fmt) {
3022 /* Dereference of functions is still OK */
3023 case 'S':
3024 case 's':
1e6338cf
SRV		 3025 case 'x':
3026 case 'K':
57f5677e 3027 case 'e':
841a915d
SRV		 3028 save_arg(void *);
3029 break;
3030 default:
3031 if (!isalnum(*fmt)) {
3032 save_arg(void *);
3033 break;
3034 }
3035 str = pointer(fmt, str, end, va_arg(args, void *),
3036 spec);
3037 if (str + 1 < end)
3038 *str++ = '\0';
3039 else
3040 end[-1] = '\0'; /* Must be nul terminated */
3041 }
4370aa4a 3042 /* skip all alphanumeric pointer suffixes */
fef20d9c 3043 while (isalnum(*fmt))
4370aa4a 3044 fmt++;
fef20d9c
FW		 3045 break;
3046
fef20d9c
FW		 3047 default:
3048 switch (spec.type) {
3049
3050 case FORMAT_TYPE_LONG_LONG:
4370aa4a 3051 save_arg(long long);
fef20d9c
FW		 3052 break;
3053 case FORMAT_TYPE_ULONG:
3054 case FORMAT_TYPE_LONG:
4370aa4a 3055 save_arg(unsigned long);
fef20d9c
FW		 3056 break;
3057 case FORMAT_TYPE_SIZE_T:
4370aa4a 3058 save_arg(size_t);
fef20d9c
FW		 3059 break;
3060 case FORMAT_TYPE_PTRDIFF:
4370aa4a 3061 save_arg(ptrdiff_t);
fef20d9c 3062 break;
a4e94ef0
Z		 3063 case FORMAT_TYPE_UBYTE:
3064 case FORMAT_TYPE_BYTE:
3065 save_arg(char);
3066 break;
fef20d9c
FW		 3067 case FORMAT_TYPE_USHORT:
3068 case FORMAT_TYPE_SHORT:
4370aa4a 3069 save_arg(short);
fef20d9c
FW		 3070 break;
3071 default:
4370aa4a 3072 save_arg(int);
fef20d9c 3073 }
4370aa4a
LJ		 3074 }
3075 }
fef20d9c 3076
b006f19b 3077out:
7b9186f5 3078 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
fef20d9c 3079#undef save_arg
4370aa4a
LJ		 3080}
3081EXPORT_SYMBOL_GPL(vbin_printf);
3082
3083/**
3084 * bstr_printf - Format a string from binary arguments and place it in a buffer
3085 * @buf: The buffer to place the result into
3086 * @size: The size of the buffer, including the trailing null space
3087 * @fmt: The format string to use
3088 * @bin_buf: Binary arguments for the format string
3089 *
3090 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
3091 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
3092 * a binary buffer that generated by vbin_printf.
3093 *
3094 * The format follows C99 vsnprintf, but has some extensions:
0efb4d20 3095 * see vsnprintf comment for details.
4370aa4a
LJ		 3096 *
3097 * The return value is the number of characters which would
3098 * be generated for the given input, excluding the trailing
3099 * '\0', as per ISO C99. If you want to have the exact
3100 * number of characters written into @buf as return value
3101 * (not including the trailing '\0'), use vscnprintf(). If the
3102 * return is greater than or equal to @size, the resulting
3103 * string is truncated.
3104 */
3105int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
3106{
fef20d9c 3107 struct printf_spec spec = {0};
d4be151b
AGR		 3108 char *str, *end;
3109 const char *args = (const char *)bin_buf;
4370aa4a 3110
762abb51 3111 if (WARN_ON_ONCE(size > INT_MAX))
4370aa4a 3112 return 0;
4370aa4a
LJ		 3113
3114 str = buf;
3115 end = buf + size;
3116
3117#define get_arg(type) \
3118({ \
3119 typeof(type) value; \
3120 if (sizeof(type) == 8) { \
3121 args = PTR_ALIGN(args, sizeof(u32)); \
3122 *(u32 *)&value = *(u32 *)args; \
3123 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
3124 } else { \
3125 args = PTR_ALIGN(args, sizeof(type)); \
3126 value = *(typeof(type) *)args; \
3127 } \
3128 args += sizeof(type); \
3129 value; \
3130})
3131
3132 /* Make sure end is always >= buf */
3133 if (end < buf) {
3134 end = ((void *)-1);
3135 size = end - buf;
3136 }
3137
fef20d9c 3138 while (*fmt) {
fef20d9c 3139 const char *old_fmt = fmt;
d4be151b 3140 int read = format_decode(fmt, &spec);
4370aa4a 3141
fef20d9c 3142 fmt += read;
4370aa4a 3143
fef20d9c
FW		 3144 switch (spec.type) {
3145 case FORMAT_TYPE_NONE: {
3146 int copy = read;
3147 if (str < end) {
3148 if (copy > end - str)
3149 copy = end - str;
3150 memcpy(str, old_fmt, copy);
4370aa4a 3151 }
fef20d9c
FW		 3152 str += read;
3153 break;
4370aa4a
LJ		 3154 }
3155
ed681a91 3156 case FORMAT_TYPE_WIDTH:
4d72ba01 3157 set_field_width(&spec, get_arg(int));
fef20d9c 3158 break;
4370aa4a 3159
fef20d9c 3160 case FORMAT_TYPE_PRECISION:
4d72ba01 3161 set_precision(&spec, get_arg(int));
fef20d9c 3162 break;
4370aa4a 3163
d4be151b
AGR		 3164 case FORMAT_TYPE_CHAR: {
3165 char c;
3166
fef20d9c
FW		 3167 if (!(spec.flags & LEFT)) {
3168 while (--spec.field_width > 0) {
4370aa4a
LJ		 3169 if (str < end)
3170 *str = ' ';
3171 ++str;
3172 }
3173 }
3174 c = (unsigned char) get_arg(char);
3175 if (str < end)
3176 *str = c;
3177 ++str;
fef20d9c 3178 while (--spec.field_width > 0) {
4370aa4a
LJ		 3179 if (str < end)
3180 *str = ' ';
3181 ++str;
3182 }
fef20d9c 3183 break;
d4be151b 3184 }
4370aa4a 3185
fef20d9c 3186 case FORMAT_TYPE_STR: {
4370aa4a 3187 const char *str_arg = args;
d4be151b 3188 args += strlen(str_arg) + 1;
fef20d9c
FW		 3189 str = string(str, end, (char *)str_arg, spec);
3190 break;
4370aa4a
LJ		 3191 }
3192
841a915d
SRV		 3193 case FORMAT_TYPE_PTR: {
3194 bool process = false;
3195 int copy, len;
3196 /* Non function dereferences were already done */
3197 switch (*fmt) {
3198 case 'S':
3199 case 's':
1e6338cf
SRV		 3200 case 'x':
3201 case 'K':
57f5677e 3202 case 'e':
841a915d
SRV		 3203 process = true;
3204 break;
3205 default:
3206 if (!isalnum(*fmt)) {
3207 process = true;
3208 break;
3209 }
3210 /* Pointer dereference was already processed */
3211 if (str < end) {
3212 len = copy = strlen(args);
3213 if (copy > end - str)
3214 copy = end - str;
3215 memcpy(str, args, copy);
3216 str += len;
62165600 3217 args += len + 1;
841a915d
SRV		 3218 }
3219 }
3220 if (process)
3221 str = pointer(fmt, str, end, get_arg(void *), spec);
3222
fef20d9c 3223 while (isalnum(*fmt))
4370aa4a 3224 fmt++;
fef20d9c 3225 break;
841a915d 3226 }
4370aa4a 3227
fef20d9c 3228 case FORMAT_TYPE_PERCENT_CHAR:
4370aa4a
LJ		 3229 if (str < end)
3230 *str = '%';
3231 ++str;
fef20d9c
FW		 3232 break;
3233
b006f19b
RV		 3234 case FORMAT_TYPE_INVALID:
3235 goto out;
3236
d4be151b
AGR		 3237 default: {
3238 unsigned long long num;
3239
fef20d9c
FW		 3240 switch (spec.type) {
3241
3242 case FORMAT_TYPE_LONG_LONG:
3243 num = get_arg(long long);
3244 break;
3245 case FORMAT_TYPE_ULONG:
fef20d9c
FW		 3246 case FORMAT_TYPE_LONG:
3247 num = get_arg(unsigned long);
3248 break;
3249 case FORMAT_TYPE_SIZE_T:
3250 num = get_arg(size_t);
3251 break;
3252 case FORMAT_TYPE_PTRDIFF:
3253 num = get_arg(ptrdiff_t);
3254 break;
a4e94ef0
Z		 3255 case FORMAT_TYPE_UBYTE:
3256 num = get_arg(unsigned char);
3257 break;
3258 case FORMAT_TYPE_BYTE:
3259 num = get_arg(signed char);
3260 break;
fef20d9c
FW		 3261 case FORMAT_TYPE_USHORT:
3262 num = get_arg(unsigned short);
3263 break;
3264 case FORMAT_TYPE_SHORT:
3265 num = get_arg(short);
3266 break;
3267 case FORMAT_TYPE_UINT:
3268 num = get_arg(unsigned int);
3269 break;
3270 default:
3271 num = get_arg(int);
3272 }
3273
3274 str = number(str, end, num, spec);
d4be151b
AGR		 3275 } /* default: */
3276 } /* switch(spec.type) */
3277 } /* while(*fmt) */
fef20d9c 3278
b006f19b 3279out:
4370aa4a
LJ		 3280 if (size > 0) {
3281 if (str < end)
3282 *str = '\0';
3283 else
3284 end[-1] = '\0';
3285 }
fef20d9c 3286
4370aa4a
LJ		 3287#undef get_arg
3288
3289 /* the trailing null byte doesn't count towards the total */
3290 return str - buf;
3291}
3292EXPORT_SYMBOL_GPL(bstr_printf);
3293
3294/**
3295 * bprintf - Parse a format string and place args' binary value in a buffer
3296 * @bin_buf: The buffer to place args' binary value
3297 * @size: The size of the buffer(by words(32bits), not characters)
3298 * @fmt: The format string to use
3299 * @...: Arguments for the format string
3300 *
3301 * The function returns the number of words(u32) written
3302 * into @bin_buf.
3303 */
3304int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
3305{
3306 va_list args;
3307 int ret;
3308
3309 va_start(args, fmt);
3310 ret = vbin_printf(bin_buf, size, fmt, args);
3311 va_end(args);
7b9186f5 3312
4370aa4a
LJ		 3313 return ret;
3314}
3315EXPORT_SYMBOL_GPL(bprintf);
3316
3317#endif /* CONFIG_BINARY_PRINTF */
3318
1da177e4
LT		 3319/**
3320 * vsscanf - Unformat a buffer into a list of arguments
3321 * @buf: input buffer
3322 * @fmt: format of buffer
3323 * @args: arguments
3324 */
7b9186f5 3325int vsscanf(const char *buf, const char *fmt, va_list args)
1da177e4
LT		 3326{
3327 const char *str = buf;
3328 char *next;
3329 char digit;
3330 int num = 0;
ef0658f3 3331 u8 qualifier;
53809751
JB		 3332 unsigned int base;
3333 union {
3334 long long s;
3335 unsigned long long u;
3336 } val;
ef0658f3 3337 s16 field_width;
d4be151b 3338 bool is_sign;
1da177e4 3339
da99075c 3340 while (*fmt) {
1da177e4
LT		 3341 /* skip any white space in format */
3342 /* white space in format matchs any amount of
3343 * white space, including none, in the input.
3344 */
3345 if (isspace(*fmt)) {
e7d2860b
AGR		 3346 fmt = skip_spaces(++fmt);
3347 str = skip_spaces(str);
1da177e4
LT		 3348 }
3349
3350 /* anything that is not a conversion must match exactly */
3351 if (*fmt != '%' && *fmt) {
3352 if (*fmt++ != *str++)
3353 break;
3354 continue;
3355 }
3356
3357 if (!*fmt)
3358 break;
3359 ++fmt;
7b9186f5 3360
1da177e4
LT		 3361 /* skip this conversion.
3362 * advance both strings to next white space
3363 */
3364 if (*fmt == '*') {
da99075c
JB		 3365 if (!*str)
3366 break;
f9310b2f
JY		 3367 while (!isspace(*fmt) && *fmt != '%' && *fmt) {
3368 /* '%*[' not yet supported, invalid format */
3369 if (*fmt == '[')
3370 return num;
1da177e4 3371 fmt++;
f9310b2f 3372 }
1da177e4
LT		 3373 while (!isspace(*str) && *str)
3374 str++;
3375 continue;
3376 }
3377
3378 /* get field width */
3379 field_width = -1;
53809751 3380 if (isdigit(*fmt)) {
1da177e4 3381 field_width = skip_atoi(&fmt);
53809751
JB		 3382 if (field_width <= 0)
3383 break;
3384 }
1da177e4
LT		 3385
3386 /* get conversion qualifier */
3387 qualifier = -1;
75fb8f26 3388 if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
5b5e0928 3389 *fmt == 'z') {
1da177e4
LT		 3390 qualifier = *fmt++;
3391 if (unlikely(qualifier == *fmt)) {
3392 if (qualifier == 'h') {
3393 qualifier = 'H';
3394 fmt++;
3395 } else if (qualifier == 'l') {
3396 qualifier = 'L';
3397 fmt++;
3398 }
3399 }
3400 }
1da177e4 3401
da99075c
JB		 3402 if (!*fmt)
3403 break;
3404
3405 if (*fmt == 'n') {
3406 /* return number of characters read so far */
3407 *va_arg(args, int *) = str - buf;
3408 ++fmt;
3409 continue;
3410 }
3411
3412 if (!*str)
1da177e4
LT		 3413 break;
3414
d4be151b 3415 base = 10;
3f623eba 3416 is_sign = false;
d4be151b 3417
7b9186f5 3418 switch (*fmt++) {
1da177e4
LT		 3419 case 'c':
3420 {
7b9186f5 3421 char *s = (char *)va_arg(args, char*);
1da177e4
LT		 3422 if (field_width == -1)
3423 field_width = 1;
3424 do {
3425 *s++ = *str++;
3426 } while (--field_width > 0 && *str);
3427 num++;
3428 }
3429 continue;
3430 case 's':
3431 {
7b9186f5
AGR		 3432 char *s = (char *)va_arg(args, char *);
3433 if (field_width == -1)
4be929be 3434 field_width = SHRT_MAX;
1da177e4 3435 /* first, skip leading white space in buffer */
e7d2860b 3436 str = skip_spaces(str);
1da177e4
LT		 3437
3438 /* now copy until next white space */
7b9186f5 3439 while (*str && !isspace(*str) && field_width--)
1da177e4 3440 *s++ = *str++;
1da177e4
LT		 3441 *s = '\0';
3442 num++;
3443 }
3444 continue;
f9310b2f
JY		 3445 /*
3446 * Warning: This implementation of the '[' conversion specifier
3447 * deviates from its glibc counterpart in the following ways:
3448 * (1) It does NOT support ranges i.e. '-' is NOT a special
3449 * character
3450 * (2) It cannot match the closing bracket ']' itself
3451 * (3) A field width is required
3452 * (4) '%*[' (discard matching input) is currently not supported
3453 *
3454 * Example usage:
3455 * ret = sscanf("00:0a:95","%2[^:]:%2[^:]:%2[^:]",
3456 * buf1, buf2, buf3);
3457 * if (ret < 3)
3458 * // etc..
3459 */
3460 case '[':
3461 {
3462 char *s = (char *)va_arg(args, char *);
3463 DECLARE_BITMAP(set, 256) = {0};
3464 unsigned int len = 0;
3465 bool negate = (*fmt == '^');
3466
3467 /* field width is required */
3468 if (field_width == -1)
3469 return num;
3470
3471 if (negate)
3472 ++fmt;
3473
3474 for ( ; *fmt && *fmt != ']'; ++fmt, ++len)
3475 set_bit((u8)*fmt, set);
3476
3477 /* no ']' or no character set found */
3478 if (!*fmt || !len)
3479 return num;
3480 ++fmt;
3481
3482 if (negate) {
3483 bitmap_complement(set, set, 256);
3484 /* exclude null '\0' byte */
3485 clear_bit(0, set);
3486 }
3487
3488 /* match must be non-empty */
3489 if (!test_bit((u8)*str, set))
3490 return num;
3491
3492 while (test_bit((u8)*str, set) && field_width--)
3493 *s++ = *str++;
3494 *s = '\0';
3495 ++num;
3496 }
3497 continue;
1da177e4
LT		 3498 case 'o':
3499 base = 8;
3500 break;
3501 case 'x':
3502 case 'X':
3503 base = 16;
3504 break;
3505 case 'i':
7b9186f5 3506 base = 0;
4c1ca831 3507 fallthrough;
1da177e4 3508 case 'd':
3f623eba 3509 is_sign = true;
4c1ca831 3510 fallthrough;
1da177e4
LT		 3511 case 'u':
3512 break;
3513 case '%':
3514 /* looking for '%' in str */
7b9186f5 3515 if (*str++ != '%')
1da177e4
LT		 3516 return num;
3517 continue;
3518 default:
3519 /* invalid format; stop here */
3520 return num;
3521 }
3522
3523 /* have some sort of integer conversion.
3524 * first, skip white space in buffer.
3525 */
e7d2860b 3526 str = skip_spaces(str);
1da177e4
LT		 3527
3528 digit = *str;
3529 if (is_sign && digit == '-')
3530 digit = *(str + 1);
3531
3532 if (!digit
7b9186f5
AGR		 3533 || (base == 16 && !isxdigit(digit))
3534 || (base == 10 && !isdigit(digit))
3535 || (base == 8 && (!isdigit(digit) || digit > '7'))
3536 || (base == 0 && !isdigit(digit)))
3537 break;
1da177e4 3538
53809751
JB		 3539 if (is_sign)
3540 val.s = qualifier != 'L' ?
3541 simple_strtol(str, &next, base) :
3542 simple_strtoll(str, &next, base);
3543 else
3544 val.u = qualifier != 'L' ?
3545 simple_strtoul(str, &next, base) :
3546 simple_strtoull(str, &next, base);
3547
3548 if (field_width > 0 && next - str > field_width) {
3549 if (base == 0)
3550 _parse_integer_fixup_radix(str, &base);
3551 while (next - str > field_width) {
3552 if (is_sign)
3553 val.s = div_s64(val.s, base);
3554 else
3555 val.u = div_u64(val.u, base);
3556 --next;
3557 }
3558 }
3559
7b9186f5 3560 switch (qualifier) {
1da177e4 3561 case 'H': /* that's 'hh' in format */
53809751
JB		 3562 if (is_sign)
3563 *va_arg(args, signed char *) = val.s;
3564 else
3565 *va_arg(args, unsigned char *) = val.u;
1da177e4
LT		 3566 break;
3567 case 'h':
53809751
JB		 3568 if (is_sign)
3569 *va_arg(args, short *) = val.s;
3570 else
3571 *va_arg(args, unsigned short *) = val.u;
1da177e4
LT		 3572 break;
3573 case 'l':
53809751
JB		 3574 if (is_sign)
3575 *va_arg(args, long *) = val.s;
3576 else
3577 *va_arg(args, unsigned long *) = val.u;
1da177e4
LT		 3578 break;
3579 case 'L':
53809751
JB		 3580 if (is_sign)
3581 *va_arg(args, long long *) = val.s;
3582 else
3583 *va_arg(args, unsigned long long *) = val.u;
1da177e4 3584 break;
1da177e4 3585 case 'z':
53809751
JB		 3586 *va_arg(args, size_t *) = val.u;
3587 break;
1da177e4 3588 default:
53809751
JB		 3589 if (is_sign)
3590 *va_arg(args, int *) = val.s;
3591 else
3592 *va_arg(args, unsigned int *) = val.u;
1da177e4
LT		 3593 break;
3594 }
3595 num++;
3596
3597 if (!next)
3598 break;
3599 str = next;
3600 }
c6b40d16 3601
1da177e4
LT		 3602 return num;
3603}
1da177e4
LT		 3604EXPORT_SYMBOL(vsscanf);
3605
3606/**
3607 * sscanf - Unformat a buffer into a list of arguments
3608 * @buf: input buffer
3609 * @fmt: formatting of buffer
3610 * @...: resulting arguments
3611 */
7b9186f5 3612int sscanf(const char *buf, const char *fmt, ...)
1da177e4
LT		 3613{
3614 va_list args;
3615 int i;
3616
7b9186f5
AGR		 3617 va_start(args, fmt);
3618 i = vsscanf(buf, fmt, args);
1da177e4 3619 va_end(args);
7b9186f5 3620
1da177e4
LT		 3621 return i;
3622}
1da177e4 3623EXPORT_SYMBOL(sscanf);
Linux 6.x block layer and io_uring tree(s)