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