1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Test cases for printf facility.
4  */
5 
6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7 
8 #include <linux/init.h>
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/printk.h>
12 #include <linux/random.h>
13 #include <linux/rtc.h>
14 #include <linux/slab.h>
15 #include <linux/sprintf.h>
16 #include <linux/string.h>
17 
18 #include <linux/bitmap.h>
19 #include <linux/dcache.h>
20 #include <linux/socket.h>
21 #include <linux/in.h>
22 
23 #include <linux/gfp.h>
24 #include <linux/mm.h>
25 
26 #include <linux/property.h>
27 
28 #include "../tools/testing/selftests/kselftest_module.h"
29 
30 #define BUF_SIZE 256
31 #define PAD_SIZE 16
32 #define FILL_CHAR '$'
33 
34 #define NOWARN(option, comment, block) \
35 	__diag_push(); \
36 	__diag_ignore_all(#option, comment); \
37 	block \
38 	__diag_pop();
39 
40 KSTM_MODULE_GLOBALS();
41 
42 static char *test_buffer __initdata;
43 static char *alloced_buffer __initdata;
44 
45 static int __printf(4, 0) __init
do_test(int bufsize,const char * expect,int elen,const char * fmt,va_list ap)46 do_test(int bufsize, const char *expect, int elen,
47 	const char *fmt, va_list ap)
48 {
49 	va_list aq;
50 	int ret, written;
51 
52 	total_tests++;
53 
54 	memset(alloced_buffer, FILL_CHAR, BUF_SIZE + 2*PAD_SIZE);
55 	va_copy(aq, ap);
56 	ret = vsnprintf(test_buffer, bufsize, fmt, aq);
57 	va_end(aq);
58 
59 	if (ret != elen) {
60 		pr_warn("vsnprintf(buf, %d, \"%s\", ...) returned %d, expected %d\n",
61 			bufsize, fmt, ret, elen);
62 		return 1;
63 	}
64 
65 	if (memchr_inv(alloced_buffer, FILL_CHAR, PAD_SIZE)) {
66 		pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote before buffer\n", bufsize, fmt);
67 		return 1;
68 	}
69 
70 	if (!bufsize) {
71 		if (memchr_inv(test_buffer, FILL_CHAR, BUF_SIZE + PAD_SIZE)) {
72 			pr_warn("vsnprintf(buf, 0, \"%s\", ...) wrote to buffer\n",
73 				fmt);
74 			return 1;
75 		}
76 		return 0;
77 	}
78 
79 	written = min(bufsize-1, elen);
80 	if (test_buffer[written]) {
81 		pr_warn("vsnprintf(buf, %d, \"%s\", ...) did not nul-terminate buffer\n",
82 			bufsize, fmt);
83 		return 1;
84 	}
85 
86 	if (memchr_inv(test_buffer + written + 1, FILL_CHAR, bufsize - (written + 1))) {
87 		pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote beyond the nul-terminator\n",
88 			bufsize, fmt);
89 		return 1;
90 	}
91 
92 	if (memchr_inv(test_buffer + bufsize, FILL_CHAR, BUF_SIZE + PAD_SIZE - bufsize)) {
93 		pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote beyond buffer\n", bufsize, fmt);
94 		return 1;
95 	}
96 
97 	if (memcmp(test_buffer, expect, written)) {
98 		pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote '%s', expected '%.*s'\n",
99 			bufsize, fmt, test_buffer, written, expect);
100 		return 1;
101 	}
102 	return 0;
103 }
104 
105 static void __printf(3, 4) __init
__test(const char * expect,int elen,const char * fmt,...)106 __test(const char *expect, int elen, const char *fmt, ...)
107 {
108 	va_list ap;
109 	int rand;
110 	char *p;
111 
112 	if (elen >= BUF_SIZE) {
113 		pr_err("error in test suite: expected output length %d too long. Format was '%s'.\n",
114 		       elen, fmt);
115 		failed_tests++;
116 		return;
117 	}
118 
119 	va_start(ap, fmt);
120 
121 	/*
122 	 * Every fmt+args is subjected to four tests: Three where we
123 	 * tell vsnprintf varying buffer sizes (plenty, not quite
124 	 * enough and 0), and then we also test that kvasprintf would
125 	 * be able to print it as expected.
126 	 */
127 	failed_tests += do_test(BUF_SIZE, expect, elen, fmt, ap);
128 	rand = get_random_u32_inclusive(1, elen + 1);
129 	/* Since elen < BUF_SIZE, we have 1 <= rand <= BUF_SIZE. */
130 	failed_tests += do_test(rand, expect, elen, fmt, ap);
131 	failed_tests += do_test(0, expect, elen, fmt, ap);
132 
133 	p = kvasprintf(GFP_KERNEL, fmt, ap);
134 	if (p) {
135 		total_tests++;
136 		if (memcmp(p, expect, elen+1)) {
137 			pr_warn("kvasprintf(..., \"%s\", ...) returned '%s', expected '%s'\n",
138 				fmt, p, expect);
139 			failed_tests++;
140 		}
141 		kfree(p);
142 	}
143 	va_end(ap);
144 }
145 
146 #define test(expect, fmt, ...)					\
147 	__test(expect, strlen(expect), fmt, ##__VA_ARGS__)
148 
149 static void __init
test_basic(void)150 test_basic(void)
151 {
152 	/* Work around annoying "warning: zero-length gnu_printf format string". */
153 	char nul = '\0';
154 
155 	test("", &nul);
156 	test("100%", "100%%");
157 	test("xxx%yyy", "xxx%cyyy", '%');
158 	__test("xxx\0yyy", 7, "xxx%cyyy", '\0');
159 }
160 
161 static void __init
test_number(void)162 test_number(void)
163 {
164 	test("0x1234abcd  ", "%#-12x", 0x1234abcd);
165 	test("  0x1234abcd", "%#12x", 0x1234abcd);
166 	test("0|001| 12|+123| 1234|-123|-1234", "%d|%03d|%3d|%+d|% d|%+d|% d", 0, 1, 12, 123, 1234, -123, -1234);
167 	NOWARN(-Wformat, "Intentionally test narrowing conversion specifiers.", {
168 		test("0|1|1|128|255", "%hhu|%hhu|%hhu|%hhu|%hhu", 0, 1, 257, 128, -1);
169 		test("0|1|1|-128|-1", "%hhd|%hhd|%hhd|%hhd|%hhd", 0, 1, 257, 128, -1);
170 		test("2015122420151225", "%ho%ho%#ho", 1037, 5282, -11627);
171 	})
172 	/*
173 	 * POSIX/C99: »The result of converting zero with an explicit
174 	 * precision of zero shall be no characters.« Hence the output
175 	 * from the below test should really be "00|0||| ". However,
176 	 * the kernel's printf also produces a single 0 in that
177 	 * case. This test case simply documents the current
178 	 * behaviour.
179 	 */
180 	test("00|0|0|0|0", "%.2d|%.1d|%.0d|%.*d|%1.0d", 0, 0, 0, 0, 0, 0);
181 }
182 
183 static void __init
test_string(void)184 test_string(void)
185 {
186 	test("", "%s%.0s", "", "123");
187 	test("ABCD|abc|123", "%s|%.3s|%.*s", "ABCD", "abcdef", 3, "123456");
188 	test("1  |  2|3  |  4|5  ", "%-3s|%3s|%-*s|%*s|%*s", "1", "2", 3, "3", 3, "4", -3, "5");
189 	test("1234      ", "%-10.4s", "123456");
190 	test("      1234", "%10.4s", "123456");
191 	/*
192 	 * POSIX and C99 say that a negative precision (which is only
193 	 * possible to pass via a * argument) should be treated as if
194 	 * the precision wasn't present, and that if the precision is
195 	 * omitted (as in %.s), the precision should be taken to be
196 	 * 0. However, the kernel's printf behave exactly opposite,
197 	 * treating a negative precision as 0 and treating an omitted
198 	 * precision specifier as if no precision was given.
199 	 *
200 	 * These test cases document the current behaviour; should
201 	 * anyone ever feel the need to follow the standards more
202 	 * closely, this can be revisited.
203 	 */
204 	test("    ", "%4.*s", -5, "123456");
205 	test("123456", "%.s", "123456");
206 	test("a||", "%.s|%.0s|%.*s", "a", "b", 0, "c");
207 	test("a  |   |   ", "%-3.s|%-3.0s|%-3.*s", "a", "b", 0, "c");
208 }
209 
210 #define PLAIN_BUF_SIZE 64	/* leave some space so we don't oops */
211 
212 #if BITS_PER_LONG == 64
213 
214 #define PTR_WIDTH 16
215 #define PTR ((void *)0xffff0123456789abUL)
216 #define PTR_STR "ffff0123456789ab"
217 #define PTR_VAL_NO_CRNG "(____ptrval____)"
218 #define ZEROS "00000000"	/* hex 32 zero bits */
219 #define ONES "ffffffff"		/* hex 32 one bits */
220 
221 static int __init
plain_format(void)222 plain_format(void)
223 {
224 	char buf[PLAIN_BUF_SIZE];
225 	int nchars;
226 
227 	nchars = snprintf(buf, PLAIN_BUF_SIZE, "%p", PTR);
228 
229 	if (nchars != PTR_WIDTH)
230 		return -1;
231 
232 	if (strncmp(buf, PTR_VAL_NO_CRNG, PTR_WIDTH) == 0) {
233 		pr_warn("crng possibly not yet initialized. plain 'p' buffer contains \"%s\"",
234 			PTR_VAL_NO_CRNG);
235 		return 0;
236 	}
237 
238 	if (strncmp(buf, ZEROS, strlen(ZEROS)) != 0)
239 		return -1;
240 
241 	return 0;
242 }
243 
244 #else
245 
246 #define PTR_WIDTH 8
247 #define PTR ((void *)0x456789ab)
248 #define PTR_STR "456789ab"
249 #define PTR_VAL_NO_CRNG "(ptrval)"
250 #define ZEROS ""
251 #define ONES ""
252 
253 static int __init
plain_format(void)254 plain_format(void)
255 {
256 	/* Format is implicitly tested for 32 bit machines by plain_hash() */
257 	return 0;
258 }
259 
260 #endif	/* BITS_PER_LONG == 64 */
261 
262 static int __init
plain_hash_to_buffer(const void * p,char * buf,size_t len)263 plain_hash_to_buffer(const void *p, char *buf, size_t len)
264 {
265 	int nchars;
266 
267 	nchars = snprintf(buf, len, "%p", p);
268 
269 	if (nchars != PTR_WIDTH)
270 		return -1;
271 
272 	if (strncmp(buf, PTR_VAL_NO_CRNG, PTR_WIDTH) == 0) {
273 		pr_warn("crng possibly not yet initialized. plain 'p' buffer contains \"%s\"",
274 			PTR_VAL_NO_CRNG);
275 		return 0;
276 	}
277 
278 	return 0;
279 }
280 
281 static int __init
plain_hash(void)282 plain_hash(void)
283 {
284 	char buf[PLAIN_BUF_SIZE];
285 	int ret;
286 
287 	ret = plain_hash_to_buffer(PTR, buf, PLAIN_BUF_SIZE);
288 	if (ret)
289 		return ret;
290 
291 	if (strncmp(buf, PTR_STR, PTR_WIDTH) == 0)
292 		return -1;
293 
294 	return 0;
295 }
296 
297 /*
298  * We can't use test() to test %p because we don't know what output to expect
299  * after an address is hashed.
300  */
301 static void __init
plain(void)302 plain(void)
303 {
304 	int err;
305 
306 	if (no_hash_pointers) {
307 		pr_warn("skipping plain 'p' tests");
308 		skipped_tests += 2;
309 		return;
310 	}
311 
312 	err = plain_hash();
313 	if (err) {
314 		pr_warn("plain 'p' does not appear to be hashed\n");
315 		failed_tests++;
316 		return;
317 	}
318 
319 	err = plain_format();
320 	if (err) {
321 		pr_warn("hashing plain 'p' has unexpected format\n");
322 		failed_tests++;
323 	}
324 }
325 
326 static void __init
test_hashed(const char * fmt,const void * p)327 test_hashed(const char *fmt, const void *p)
328 {
329 	char buf[PLAIN_BUF_SIZE];
330 	int ret;
331 
332 	/*
333 	 * No need to increase failed test counter since this is assumed
334 	 * to be called after plain().
335 	 */
336 	ret = plain_hash_to_buffer(p, buf, PLAIN_BUF_SIZE);
337 	if (ret)
338 		return;
339 
340 	test(buf, fmt, p);
341 }
342 
343 /*
344  * NULL pointers aren't hashed.
345  */
346 static void __init
null_pointer(void)347 null_pointer(void)
348 {
349 	test(ZEROS "00000000", "%p", NULL);
350 	test(ZEROS "00000000", "%px", NULL);
351 	test("(null)", "%pE", NULL);
352 }
353 
354 /*
355  * Error pointers aren't hashed.
356  */
357 static void __init
error_pointer(void)358 error_pointer(void)
359 {
360 	test(ONES "fffffff5", "%p", ERR_PTR(-11));
361 	test(ONES "fffffff5", "%px", ERR_PTR(-11));
362 	test("(efault)", "%pE", ERR_PTR(-11));
363 }
364 
365 #define PTR_INVALID ((void *)0x000000ab)
366 
367 static void __init
invalid_pointer(void)368 invalid_pointer(void)
369 {
370 	test_hashed("%p", PTR_INVALID);
371 	test(ZEROS "000000ab", "%px", PTR_INVALID);
372 	test("(efault)", "%pE", PTR_INVALID);
373 }
374 
375 static void __init
symbol_ptr(void)376 symbol_ptr(void)
377 {
378 }
379 
380 static void __init
kernel_ptr(void)381 kernel_ptr(void)
382 {
383 	/* We can't test this without access to kptr_restrict. */
384 }
385 
386 static void __init
struct_resource(void)387 struct_resource(void)
388 {
389 }
390 
391 static void __init
addr(void)392 addr(void)
393 {
394 }
395 
396 static void __init
escaped_str(void)397 escaped_str(void)
398 {
399 }
400 
401 static void __init
hex_string(void)402 hex_string(void)
403 {
404 	const char buf[3] = {0xc0, 0xff, 0xee};
405 
406 	test("c0 ff ee|c0:ff:ee|c0-ff-ee|c0ffee",
407 	     "%3ph|%3phC|%3phD|%3phN", buf, buf, buf, buf);
408 	test("c0 ff ee|c0:ff:ee|c0-ff-ee|c0ffee",
409 	     "%*ph|%*phC|%*phD|%*phN", 3, buf, 3, buf, 3, buf, 3, buf);
410 }
411 
412 static void __init
mac(void)413 mac(void)
414 {
415 	const u8 addr[6] = {0x2d, 0x48, 0xd6, 0xfc, 0x7a, 0x05};
416 
417 	test("2d:48:d6:fc:7a:05", "%pM", addr);
418 	test("05:7a:fc:d6:48:2d", "%pMR", addr);
419 	test("2d-48-d6-fc-7a-05", "%pMF", addr);
420 	test("2d48d6fc7a05", "%pm", addr);
421 	test("057afcd6482d", "%pmR", addr);
422 }
423 
424 static void __init
ip4(void)425 ip4(void)
426 {
427 	struct sockaddr_in sa;
428 
429 	sa.sin_family = AF_INET;
430 	sa.sin_port = cpu_to_be16(12345);
431 	sa.sin_addr.s_addr = cpu_to_be32(0x7f000001);
432 
433 	test("127.000.000.001|127.0.0.1", "%pi4|%pI4", &sa.sin_addr, &sa.sin_addr);
434 	test("127.000.000.001|127.0.0.1", "%piS|%pIS", &sa, &sa);
435 	sa.sin_addr.s_addr = cpu_to_be32(0x01020304);
436 	test("001.002.003.004:12345|1.2.3.4:12345", "%piSp|%pISp", &sa, &sa);
437 }
438 
439 static void __init
ip6(void)440 ip6(void)
441 {
442 }
443 
444 static void __init
ip(void)445 ip(void)
446 {
447 	ip4();
448 	ip6();
449 }
450 
451 static void __init
uuid(void)452 uuid(void)
453 {
454 	const char uuid[16] = {0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7,
455 			       0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf};
456 
457 	test("00010203-0405-0607-0809-0a0b0c0d0e0f", "%pUb", uuid);
458 	test("00010203-0405-0607-0809-0A0B0C0D0E0F", "%pUB", uuid);
459 	test("03020100-0504-0706-0809-0a0b0c0d0e0f", "%pUl", uuid);
460 	test("03020100-0504-0706-0809-0A0B0C0D0E0F", "%pUL", uuid);
461 }
462 
463 static struct dentry test_dentry[4] __initdata = {
464 	{ .d_parent = &test_dentry[0],
465 	  .d_name = QSTR_INIT(test_dentry[0].d_iname, 3),
466 	  .d_iname = "foo" },
467 	{ .d_parent = &test_dentry[0],
468 	  .d_name = QSTR_INIT(test_dentry[1].d_iname, 5),
469 	  .d_iname = "bravo" },
470 	{ .d_parent = &test_dentry[1],
471 	  .d_name = QSTR_INIT(test_dentry[2].d_iname, 4),
472 	  .d_iname = "alfa" },
473 	{ .d_parent = &test_dentry[2],
474 	  .d_name = QSTR_INIT(test_dentry[3].d_iname, 5),
475 	  .d_iname = "romeo" },
476 };
477 
478 static void __init
dentry(void)479 dentry(void)
480 {
481 	test("foo", "%pd", &test_dentry[0]);
482 	test("foo", "%pd2", &test_dentry[0]);
483 
484 	test("(null)", "%pd", NULL);
485 	test("(efault)", "%pd", PTR_INVALID);
486 	test("(null)", "%pD", NULL);
487 	test("(efault)", "%pD", PTR_INVALID);
488 
489 	test("romeo", "%pd", &test_dentry[3]);
490 	test("alfa/romeo", "%pd2", &test_dentry[3]);
491 	test("bravo/alfa/romeo", "%pd3", &test_dentry[3]);
492 	test("/bravo/alfa/romeo", "%pd4", &test_dentry[3]);
493 	test("/bravo/alfa", "%pd4", &test_dentry[2]);
494 
495 	test("bravo/alfa  |bravo/alfa  ", "%-12pd2|%*pd2", &test_dentry[2], -12, &test_dentry[2]);
496 	test("  bravo/alfa|  bravo/alfa", "%12pd2|%*pd2", &test_dentry[2], 12, &test_dentry[2]);
497 }
498 
499 static void __init
struct_va_format(void)500 struct_va_format(void)
501 {
502 }
503 
504 static void __init
time_and_date(void)505 time_and_date(void)
506 {
507 	/* 1543210543 */
508 	const struct rtc_time tm = {
509 		.tm_sec = 43,
510 		.tm_min = 35,
511 		.tm_hour = 5,
512 		.tm_mday = 26,
513 		.tm_mon = 10,
514 		.tm_year = 118,
515 	};
516 	/* 2019-01-04T15:32:23 */
517 	time64_t t = 1546615943;
518 
519 	test("(%pt?)", "%pt", &tm);
520 	test("2018-11-26T05:35:43", "%ptR", &tm);
521 	test("0118-10-26T05:35:43", "%ptRr", &tm);
522 	test("05:35:43|2018-11-26", "%ptRt|%ptRd", &tm, &tm);
523 	test("05:35:43|0118-10-26", "%ptRtr|%ptRdr", &tm, &tm);
524 	test("05:35:43|2018-11-26", "%ptRttr|%ptRdtr", &tm, &tm);
525 	test("05:35:43 tr|2018-11-26 tr", "%ptRt tr|%ptRd tr", &tm, &tm);
526 
527 	test("2019-01-04T15:32:23", "%ptT", &t);
528 	test("0119-00-04T15:32:23", "%ptTr", &t);
529 	test("15:32:23|2019-01-04", "%ptTt|%ptTd", &t, &t);
530 	test("15:32:23|0119-00-04", "%ptTtr|%ptTdr", &t, &t);
531 
532 	test("2019-01-04 15:32:23", "%ptTs", &t);
533 	test("0119-00-04 15:32:23", "%ptTsr", &t);
534 	test("15:32:23|2019-01-04", "%ptTts|%ptTds", &t, &t);
535 	test("15:32:23|0119-00-04", "%ptTtrs|%ptTdrs", &t, &t);
536 }
537 
538 static void __init
struct_clk(void)539 struct_clk(void)
540 {
541 }
542 
543 static void __init
large_bitmap(void)544 large_bitmap(void)
545 {
546 	const int nbits = 1 << 16;
547 	unsigned long *bits = bitmap_zalloc(nbits, GFP_KERNEL);
548 	if (!bits)
549 		return;
550 
551 	bitmap_set(bits, 1, 20);
552 	bitmap_set(bits, 60000, 15);
553 	test("1-20,60000-60014", "%*pbl", nbits, bits);
554 	bitmap_free(bits);
555 }
556 
557 static void __init
bitmap(void)558 bitmap(void)
559 {
560 	DECLARE_BITMAP(bits, 20);
561 	const int primes[] = {2,3,5,7,11,13,17,19};
562 	int i;
563 
564 	bitmap_zero(bits, 20);
565 	test("00000|00000", "%20pb|%*pb", bits, 20, bits);
566 	test("|", "%20pbl|%*pbl", bits, 20, bits);
567 
568 	for (i = 0; i < ARRAY_SIZE(primes); ++i)
569 		set_bit(primes[i], bits);
570 	test("a28ac|a28ac", "%20pb|%*pb", bits, 20, bits);
571 	test("2-3,5,7,11,13,17,19|2-3,5,7,11,13,17,19", "%20pbl|%*pbl", bits, 20, bits);
572 
573 	bitmap_fill(bits, 20);
574 	test("fffff|fffff", "%20pb|%*pb", bits, 20, bits);
575 	test("0-19|0-19", "%20pbl|%*pbl", bits, 20, bits);
576 
577 	large_bitmap();
578 }
579 
580 static void __init
netdev_features(void)581 netdev_features(void)
582 {
583 }
584 
585 struct page_flags_test {
586 	int width;
587 	int shift;
588 	int mask;
589 	const char *fmt;
590 	const char *name;
591 };
592 
593 static const struct page_flags_test pft[] = {
594 	{SECTIONS_WIDTH, SECTIONS_PGSHIFT, SECTIONS_MASK,
595 	 "%d", "section"},
596 	{NODES_WIDTH, NODES_PGSHIFT, NODES_MASK,
597 	 "%d", "node"},
598 	{ZONES_WIDTH, ZONES_PGSHIFT, ZONES_MASK,
599 	 "%d", "zone"},
600 	{LAST_CPUPID_WIDTH, LAST_CPUPID_PGSHIFT, LAST_CPUPID_MASK,
601 	 "%#x", "lastcpupid"},
602 	{KASAN_TAG_WIDTH, KASAN_TAG_PGSHIFT, KASAN_TAG_MASK,
603 	 "%#x", "kasantag"},
604 };
605 
606 static void __init
page_flags_test(int section,int node,int zone,int last_cpupid,int kasan_tag,unsigned long flags,const char * name,char * cmp_buf)607 page_flags_test(int section, int node, int zone, int last_cpupid,
608 		int kasan_tag, unsigned long flags, const char *name,
609 		char *cmp_buf)
610 {
611 	unsigned long values[] = {section, node, zone, last_cpupid, kasan_tag};
612 	unsigned long size;
613 	bool append = false;
614 	int i;
615 
616 	for (i = 0; i < ARRAY_SIZE(values); i++)
617 		flags |= (values[i] & pft[i].mask) << pft[i].shift;
618 
619 	size = scnprintf(cmp_buf, BUF_SIZE, "%#lx(", flags);
620 	if (flags & PAGEFLAGS_MASK) {
621 		size += scnprintf(cmp_buf + size, BUF_SIZE - size, "%s", name);
622 		append = true;
623 	}
624 
625 	for (i = 0; i < ARRAY_SIZE(pft); i++) {
626 		if (!pft[i].width)
627 			continue;
628 
629 		if (append)
630 			size += scnprintf(cmp_buf + size, BUF_SIZE - size, "|");
631 
632 		size += scnprintf(cmp_buf + size, BUF_SIZE - size, "%s=",
633 				pft[i].name);
634 		size += scnprintf(cmp_buf + size, BUF_SIZE - size, pft[i].fmt,
635 				values[i] & pft[i].mask);
636 		append = true;
637 	}
638 
639 	snprintf(cmp_buf + size, BUF_SIZE - size, ")");
640 
641 	test(cmp_buf, "%pGp", &flags);
642 }
643 
644 static void __init
flags(void)645 flags(void)
646 {
647 	unsigned long flags;
648 	char *cmp_buffer;
649 	gfp_t gfp;
650 
651 	cmp_buffer = kmalloc(BUF_SIZE, GFP_KERNEL);
652 	if (!cmp_buffer)
653 		return;
654 
655 	flags = 0;
656 	page_flags_test(0, 0, 0, 0, 0, flags, "", cmp_buffer);
657 
658 	flags = 1UL << NR_PAGEFLAGS;
659 	page_flags_test(0, 0, 0, 0, 0, flags, "", cmp_buffer);
660 
661 	flags |= 1UL << PG_uptodate | 1UL << PG_dirty | 1UL << PG_lru
662 		| 1UL << PG_active | 1UL << PG_swapbacked;
663 	page_flags_test(1, 1, 1, 0x1fffff, 1, flags,
664 			"uptodate|dirty|lru|active|swapbacked",
665 			cmp_buffer);
666 
667 	flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC;
668 	test("read|exec|mayread|maywrite|mayexec", "%pGv", &flags);
669 
670 	gfp = GFP_TRANSHUGE;
671 	test("GFP_TRANSHUGE", "%pGg", &gfp);
672 
673 	gfp = GFP_ATOMIC|__GFP_DMA;
674 	test("GFP_ATOMIC|GFP_DMA", "%pGg", &gfp);
675 
676 	gfp = __GFP_HIGH;
677 	test("__GFP_HIGH", "%pGg", &gfp);
678 
679 	/* Any flags not translated by the table should remain numeric */
680 	gfp = ~__GFP_BITS_MASK;
681 	snprintf(cmp_buffer, BUF_SIZE, "%#lx", (unsigned long) gfp);
682 	test(cmp_buffer, "%pGg", &gfp);
683 
684 	snprintf(cmp_buffer, BUF_SIZE, "__GFP_HIGH|%#lx",
685 							(unsigned long) gfp);
686 	gfp |= __GFP_HIGH;
687 	test(cmp_buffer, "%pGg", &gfp);
688 
689 	kfree(cmp_buffer);
690 }
691 
fwnode_pointer(void)692 static void __init fwnode_pointer(void)
693 {
694 	const struct software_node first = { .name = "first" };
695 	const struct software_node second = { .name = "second", .parent = &first };
696 	const struct software_node third = { .name = "third", .parent = &second };
697 	const struct software_node *group[] = { &first, &second, &third, NULL };
698 	const char * const full_name_second = "first/second";
699 	const char * const full_name_third = "first/second/third";
700 	const char * const second_name = "second";
701 	const char * const third_name = "third";
702 	int rval;
703 
704 	rval = software_node_register_node_group(group);
705 	if (rval) {
706 		pr_warn("cannot register softnodes; rval %d\n", rval);
707 		return;
708 	}
709 
710 	test(full_name_second, "%pfw", software_node_fwnode(&second));
711 	test(full_name_third, "%pfw", software_node_fwnode(&third));
712 	test(full_name_third, "%pfwf", software_node_fwnode(&third));
713 	test(second_name, "%pfwP", software_node_fwnode(&second));
714 	test(third_name, "%pfwP", software_node_fwnode(&third));
715 
716 	software_node_unregister_node_group(group);
717 }
718 
fourcc_pointer(void)719 static void __init fourcc_pointer(void)
720 {
721 	struct {
722 		u32 code;
723 		char *str;
724 	} const try[] = {
725 		{ 0x3231564e, "NV12 little-endian (0x3231564e)", },
726 		{ 0xb231564e, "NV12 big-endian (0xb231564e)", },
727 		{ 0x10111213, ".... little-endian (0x10111213)", },
728 		{ 0x20303159, "Y10  little-endian (0x20303159)", },
729 	};
730 	unsigned int i;
731 
732 	for (i = 0; i < ARRAY_SIZE(try); i++)
733 		test(try[i].str, "%p4cc", &try[i].code);
734 }
735 
736 static void __init
errptr(void)737 errptr(void)
738 {
739 	test("-1234", "%pe", ERR_PTR(-1234));
740 
741 	/* Check that %pe with a non-ERR_PTR gets treated as ordinary %p. */
742 	BUILD_BUG_ON(IS_ERR(PTR));
743 	test_hashed("%pe", PTR);
744 
745 #ifdef CONFIG_SYMBOLIC_ERRNAME
746 	test("(-ENOTSOCK)", "(%pe)", ERR_PTR(-ENOTSOCK));
747 	test("(-EAGAIN)", "(%pe)", ERR_PTR(-EAGAIN));
748 	BUILD_BUG_ON(EAGAIN != EWOULDBLOCK);
749 	test("(-EAGAIN)", "(%pe)", ERR_PTR(-EWOULDBLOCK));
750 	test("[-EIO    ]", "[%-8pe]", ERR_PTR(-EIO));
751 	test("[    -EIO]", "[%8pe]", ERR_PTR(-EIO));
752 	test("-EPROBE_DEFER", "%pe", ERR_PTR(-EPROBE_DEFER));
753 #endif
754 }
755 
756 static void __init
test_pointer(void)757 test_pointer(void)
758 {
759 	plain();
760 	null_pointer();
761 	error_pointer();
762 	invalid_pointer();
763 	symbol_ptr();
764 	kernel_ptr();
765 	struct_resource();
766 	addr();
767 	escaped_str();
768 	hex_string();
769 	mac();
770 	ip();
771 	uuid();
772 	dentry();
773 	struct_va_format();
774 	time_and_date();
775 	struct_clk();
776 	bitmap();
777 	netdev_features();
778 	flags();
779 	errptr();
780 	fwnode_pointer();
781 	fourcc_pointer();
782 }
783 
selftest(void)784 static void __init selftest(void)
785 {
786 	alloced_buffer = kmalloc(BUF_SIZE + 2*PAD_SIZE, GFP_KERNEL);
787 	if (!alloced_buffer)
788 		return;
789 	test_buffer = alloced_buffer + PAD_SIZE;
790 
791 	test_basic();
792 	test_number();
793 	test_string();
794 	test_pointer();
795 
796 	kfree(alloced_buffer);
797 }
798 
799 KSTM_MODULE_LOADERS(test_printf);
800 MODULE_AUTHOR("Rasmus Villemoes <linux@rasmusvillemoes.dk>");
801 MODULE_DESCRIPTION("Test cases for printf facility");
802 MODULE_LICENSE("GPL");
803