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/string.h>
16
17 #include <linux/bitmap.h>
18 #include <linux/dcache.h>
19 #include <linux/socket.h>
20 #include <linux/in.h>
21
22 #include <linux/gfp.h>
23 #include <linux/mm.h>
24
25 #include <linux/property.h>
26
27 #include "../tools/testing/selftests/kselftest_module.h"
28
29 #define BUF_SIZE 256
30 #define PAD_SIZE 16
31 #define FILL_CHAR '$'
32
33 KSTM_MODULE_GLOBALS();
34
35 static char *test_buffer __initdata;
36 static char *alloced_buffer __initdata;
37
38 extern bool no_hash_pointers;
39
40 static int __printf(4, 0) __init
do_test(int bufsize,const char * expect,int elen,const char * fmt,va_list ap)41 do_test(int bufsize, const char *expect, int elen,
42 const char *fmt, va_list ap)
43 {
44 va_list aq;
45 int ret, written;
46
47 total_tests++;
48
49 memset(alloced_buffer, FILL_CHAR, BUF_SIZE + 2*PAD_SIZE);
50 va_copy(aq, ap);
51 ret = vsnprintf(test_buffer, bufsize, fmt, aq);
52 va_end(aq);
53
54 if (ret != elen) {
55 pr_warn("vsnprintf(buf, %d, \"%s\", ...) returned %d, expected %d\n",
56 bufsize, fmt, ret, elen);
57 return 1;
58 }
59
60 if (memchr_inv(alloced_buffer, FILL_CHAR, PAD_SIZE)) {
61 pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote before buffer\n", bufsize, fmt);
62 return 1;
63 }
64
65 if (!bufsize) {
66 if (memchr_inv(test_buffer, FILL_CHAR, BUF_SIZE + PAD_SIZE)) {
67 pr_warn("vsnprintf(buf, 0, \"%s\", ...) wrote to buffer\n",
68 fmt);
69 return 1;
70 }
71 return 0;
72 }
73
74 written = min(bufsize-1, elen);
75 if (test_buffer[written]) {
76 pr_warn("vsnprintf(buf, %d, \"%s\", ...) did not nul-terminate buffer\n",
77 bufsize, fmt);
78 return 1;
79 }
80
81 if (memchr_inv(test_buffer + written + 1, FILL_CHAR, BUF_SIZE + PAD_SIZE - (written + 1))) {
82 pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote beyond the nul-terminator\n",
83 bufsize, fmt);
84 return 1;
85 }
86
87 if (memcmp(test_buffer, expect, written)) {
88 pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote '%s', expected '%.*s'\n",
89 bufsize, fmt, test_buffer, written, expect);
90 return 1;
91 }
92 return 0;
93 }
94
95 static void __printf(3, 4) __init
__test(const char * expect,int elen,const char * fmt,...)96 __test(const char *expect, int elen, const char *fmt, ...)
97 {
98 va_list ap;
99 int rand;
100 char *p;
101
102 if (elen >= BUF_SIZE) {
103 pr_err("error in test suite: expected output length %d too long. Format was '%s'.\n",
104 elen, fmt);
105 failed_tests++;
106 return;
107 }
108
109 va_start(ap, fmt);
110
111 /*
112 * Every fmt+args is subjected to four tests: Three where we
113 * tell vsnprintf varying buffer sizes (plenty, not quite
114 * enough and 0), and then we also test that kvasprintf would
115 * be able to print it as expected.
116 */
117 failed_tests += do_test(BUF_SIZE, expect, elen, fmt, ap);
118 rand = 1 + prandom_u32_max(elen+1);
119 /* Since elen < BUF_SIZE, we have 1 <= rand <= BUF_SIZE. */
120 failed_tests += do_test(rand, expect, elen, fmt, ap);
121 failed_tests += do_test(0, expect, elen, fmt, ap);
122
123 p = kvasprintf(GFP_KERNEL, fmt, ap);
124 if (p) {
125 total_tests++;
126 if (memcmp(p, expect, elen+1)) {
127 pr_warn("kvasprintf(..., \"%s\", ...) returned '%s', expected '%s'\n",
128 fmt, p, expect);
129 failed_tests++;
130 }
131 kfree(p);
132 }
133 va_end(ap);
134 }
135
136 #define test(expect, fmt, ...) \
137 __test(expect, strlen(expect), fmt, ##__VA_ARGS__)
138
139 static void __init
test_basic(void)140 test_basic(void)
141 {
142 /* Work around annoying "warning: zero-length gnu_printf format string". */
143 char nul = '\0';
144
145 test("", &nul);
146 test("100%", "100%%");
147 test("xxx%yyy", "xxx%cyyy", '%');
148 __test("xxx\0yyy", 7, "xxx%cyyy", '\0');
149 }
150
151 static void __init
test_number(void)152 test_number(void)
153 {
154 test("0x1234abcd ", "%#-12x", 0x1234abcd);
155 test(" 0x1234abcd", "%#12x", 0x1234abcd);
156 test("0|001| 12|+123| 1234|-123|-1234", "%d|%03d|%3d|%+d|% d|%+d|% d", 0, 1, 12, 123, 1234, -123, -1234);
157 test("0|1|1|128|255", "%hhu|%hhu|%hhu|%hhu|%hhu", 0, 1, 257, 128, -1);
158 test("0|1|1|-128|-1", "%hhd|%hhd|%hhd|%hhd|%hhd", 0, 1, 257, 128, -1);
159 test("2015122420151225", "%ho%ho%#ho", 1037, 5282, -11627);
160 /*
161 * POSIX/C99: »The result of converting zero with an explicit
162 * precision of zero shall be no characters.« Hence the output
163 * from the below test should really be "00|0||| ". However,
164 * the kernel's printf also produces a single 0 in that
165 * case. This test case simply documents the current
166 * behaviour.
167 */
168 test("00|0|0|0|0", "%.2d|%.1d|%.0d|%.*d|%1.0d", 0, 0, 0, 0, 0, 0);
169 #ifndef __CHAR_UNSIGNED__
170 {
171 /*
172 * Passing a 'char' to a %02x specifier doesn't do
173 * what was presumably the intention when char is
174 * signed and the value is negative. One must either &
175 * with 0xff or cast to u8.
176 */
177 char val = -16;
178 test("0xfffffff0|0xf0|0xf0", "%#02x|%#02x|%#02x", val, val & 0xff, (u8)val);
179 }
180 #endif
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_ATOMIC;
677 test("__GFP_ATOMIC", "%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_ATOMIC|%#lx",
685 (unsigned long) gfp);
686 gfp |= __GFP_ATOMIC;
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 softnodes[] = {
695 { .name = "first", },
696 { .name = "second", .parent = &softnodes[0], },
697 { .name = "third", .parent = &softnodes[1], },
698 { NULL /* Guardian */ }
699 };
700 const char * const full_name = "first/second/third";
701 const char * const full_name_second = "first/second";
702 const char * const second_name = "second";
703 const char * const third_name = "third";
704 int rval;
705
706 rval = software_node_register_nodes(softnodes);
707 if (rval) {
708 pr_warn("cannot register softnodes; rval %d\n", rval);
709 return;
710 }
711
712 test(full_name_second, "%pfw", software_node_fwnode(&softnodes[1]));
713 test(full_name, "%pfw", software_node_fwnode(&softnodes[2]));
714 test(full_name, "%pfwf", software_node_fwnode(&softnodes[2]));
715 test(second_name, "%pfwP", software_node_fwnode(&softnodes[1]));
716 test(third_name, "%pfwP", software_node_fwnode(&softnodes[2]));
717
718 software_node_unregister_nodes(softnodes);
719 }
720
fourcc_pointer(void)721 static void __init fourcc_pointer(void)
722 {
723 struct {
724 u32 code;
725 char *str;
726 } const try[] = {
727 { 0x3231564e, "NV12 little-endian (0x3231564e)", },
728 { 0xb231564e, "NV12 big-endian (0xb231564e)", },
729 { 0x10111213, ".... little-endian (0x10111213)", },
730 { 0x20303159, "Y10 little-endian (0x20303159)", },
731 };
732 unsigned int i;
733
734 for (i = 0; i < ARRAY_SIZE(try); i++)
735 test(try[i].str, "%p4cc", &try[i].code);
736 }
737
738 static void __init
errptr(void)739 errptr(void)
740 {
741 test("-1234", "%pe", ERR_PTR(-1234));
742
743 /* Check that %pe with a non-ERR_PTR gets treated as ordinary %p. */
744 BUILD_BUG_ON(IS_ERR(PTR));
745 test_hashed("%pe", PTR);
746
747 #ifdef CONFIG_SYMBOLIC_ERRNAME
748 test("(-ENOTSOCK)", "(%pe)", ERR_PTR(-ENOTSOCK));
749 test("(-EAGAIN)", "(%pe)", ERR_PTR(-EAGAIN));
750 BUILD_BUG_ON(EAGAIN != EWOULDBLOCK);
751 test("(-EAGAIN)", "(%pe)", ERR_PTR(-EWOULDBLOCK));
752 test("[-EIO ]", "[%-8pe]", ERR_PTR(-EIO));
753 test("[ -EIO]", "[%8pe]", ERR_PTR(-EIO));
754 test("-EPROBE_DEFER", "%pe", ERR_PTR(-EPROBE_DEFER));
755 #endif
756 }
757
758 static void __init
test_pointer(void)759 test_pointer(void)
760 {
761 plain();
762 null_pointer();
763 error_pointer();
764 invalid_pointer();
765 symbol_ptr();
766 kernel_ptr();
767 struct_resource();
768 addr();
769 escaped_str();
770 hex_string();
771 mac();
772 ip();
773 uuid();
774 dentry();
775 struct_va_format();
776 time_and_date();
777 struct_clk();
778 bitmap();
779 netdev_features();
780 flags();
781 errptr();
782 fwnode_pointer();
783 fourcc_pointer();
784 }
785
selftest(void)786 static void __init selftest(void)
787 {
788 alloced_buffer = kmalloc(BUF_SIZE + 2*PAD_SIZE, GFP_KERNEL);
789 if (!alloced_buffer)
790 return;
791 test_buffer = alloced_buffer + PAD_SIZE;
792
793 test_basic();
794 test_number();
795 test_string();
796 test_pointer();
797
798 kfree(alloced_buffer);
799 }
800
801 KSTM_MODULE_LOADERS(test_printf);
802 MODULE_AUTHOR("Rasmus Villemoes <linux@rasmusvillemoes.dk>");
803 MODULE_LICENSE("GPL");
804