1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Test cases for printf facility.
4 */
5
6 #include <kunit/test.h>
7 #include <linux/kernel.h>
8 #include <linux/module.h>
9 #include <linux/printk.h>
10 #include <linux/random.h>
11 #include <linux/rtc.h>
12 #include <linux/slab.h>
13 #include <linux/sprintf.h>
14 #include <linux/string.h>
15
16 #include <linux/bitmap.h>
17 #include <linux/dcache.h>
18 #include <linux/socket.h>
19 #include <linux/in.h>
20
21 #include <linux/gfp.h>
22 #include <linux/mm.h>
23
24 #include <linux/property.h>
25
26 #define BUF_SIZE 256
27 #define PAD_SIZE 16
28 #define FILL_CHAR '$'
29
30 #define NOWARN(option, comment, block) \
31 __diag_push(); \
32 __diag_ignore_all(#option, comment); \
33 block \
34 __diag_pop();
35
36 static unsigned int total_tests;
37
38 static char *test_buffer;
39 static char *alloced_buffer;
40
41 static void __printf(7, 0)
do_test(struct kunit * kunittest,const char * file,const int line,int bufsize,const char * expect,int elen,const char * fmt,va_list ap)42 do_test(struct kunit *kunittest, const char *file, const int line, int bufsize, const char *expect,
43 int elen, const char *fmt, va_list ap)
44 {
45 va_list aq;
46 int ret, written;
47
48 total_tests++;
49
50 memset(alloced_buffer, FILL_CHAR, BUF_SIZE + 2*PAD_SIZE);
51 va_copy(aq, ap);
52 ret = vsnprintf(test_buffer, bufsize, fmt, aq);
53 va_end(aq);
54
55 if (ret != elen) {
56 KUNIT_FAIL(kunittest,
57 "%s:%d: vsnprintf(buf, %d, \"%s\", ...) returned %d, expected %d\n",
58 file, line, bufsize, fmt, ret, elen);
59 return;
60 }
61
62 if (memchr_inv(alloced_buffer, FILL_CHAR, PAD_SIZE)) {
63 KUNIT_FAIL(kunittest,
64 "%s:%d: vsnprintf(buf, %d, \"%s\", ...) wrote before buffer\n",
65 file, line, bufsize, fmt);
66 return;
67 }
68
69 if (!bufsize) {
70 if (memchr_inv(test_buffer, FILL_CHAR, BUF_SIZE + PAD_SIZE)) {
71 KUNIT_FAIL(kunittest,
72 "%s:%d: vsnprintf(buf, 0, \"%s\", ...) wrote to buffer\n",
73 file, line, fmt);
74 }
75 return;
76 }
77
78 written = min(bufsize-1, elen);
79 if (test_buffer[written]) {
80 KUNIT_FAIL(kunittest,
81 "%s:%d: vsnprintf(buf, %d, \"%s\", ...) did not nul-terminate buffer\n",
82 file, line, bufsize, fmt);
83 return;
84 }
85
86 if (memchr_inv(test_buffer + written + 1, FILL_CHAR, bufsize - (written + 1))) {
87 KUNIT_FAIL(kunittest,
88 "%s:%d: vsnprintf(buf, %d, \"%s\", ...) wrote beyond the nul-terminator\n",
89 file, line, bufsize, fmt);
90 return;
91 }
92
93 if (memchr_inv(test_buffer + bufsize, FILL_CHAR, BUF_SIZE + PAD_SIZE - bufsize)) {
94 KUNIT_FAIL(kunittest,
95 "%s:%d: vsnprintf(buf, %d, \"%s\", ...) wrote beyond buffer\n",
96 file, line, bufsize, fmt);
97 return;
98 }
99
100 if (memcmp(test_buffer, expect, written)) {
101 KUNIT_FAIL(kunittest,
102 "%s:%d: vsnprintf(buf, %d, \"%s\", ...) wrote '%s', expected '%.*s'\n",
103 file, line, bufsize, fmt, test_buffer, written, expect);
104 return;
105 }
106 }
107
108 static void __printf(6, 7)
__test(struct kunit * kunittest,const char * file,const int line,const char * expect,int elen,const char * fmt,...)109 __test(struct kunit *kunittest, const char *file, const int line, const char *expect, int elen,
110 const char *fmt, ...)
111 {
112 va_list ap;
113 int rand;
114 char *p;
115
116 if (elen >= BUF_SIZE) {
117 KUNIT_FAIL(kunittest,
118 "%s:%d: error in test suite: expected length (%d) >= BUF_SIZE (%d). fmt=\"%s\"\n",
119 file, line, elen, BUF_SIZE, fmt);
120 return;
121 }
122
123 va_start(ap, fmt);
124
125 /*
126 * Every fmt+args is subjected to four tests: Three where we
127 * tell vsnprintf varying buffer sizes (plenty, not quite
128 * enough and 0), and then we also test that kvasprintf would
129 * be able to print it as expected.
130 */
131 do_test(kunittest, file, line, BUF_SIZE, expect, elen, fmt, ap);
132 rand = get_random_u32_inclusive(1, elen + 1);
133 /* Since elen < BUF_SIZE, we have 1 <= rand <= BUF_SIZE. */
134 do_test(kunittest, file, line, rand, expect, elen, fmt, ap);
135 do_test(kunittest, file, line, 0, expect, elen, fmt, ap);
136
137 p = kvasprintf(GFP_KERNEL, fmt, ap);
138 if (p) {
139 total_tests++;
140 if (memcmp(p, expect, elen+1)) {
141 KUNIT_FAIL(kunittest,
142 "%s:%d: kvasprintf(..., \"%s\", ...) returned '%s', expected '%s'\n",
143 file, line, fmt, p, expect);
144 }
145 kfree(p);
146 }
147 va_end(ap);
148 }
149
150 #define test(expect, fmt, ...) \
151 __test(kunittest, __FILE__, __LINE__, expect, strlen(expect), fmt, ##__VA_ARGS__)
152
153 static void
test_basic(struct kunit * kunittest)154 test_basic(struct kunit *kunittest)
155 {
156 /* Work around annoying "warning: zero-length gnu_printf format string". */
157 char nul = '\0';
158
159 test("", &nul);
160 test("100%", "100%%");
161 test("xxx%yyy", "xxx%cyyy", '%');
162 __test(kunittest, __FILE__, __LINE__, "xxx\0yyy", 7, "xxx%cyyy", '\0');
163 }
164
165 static void
test_number(struct kunit * kunittest)166 test_number(struct kunit *kunittest)
167 {
168 test("0x1234abcd ", "%#-12x", 0x1234abcd);
169 test(" 0x1234abcd", "%#12x", 0x1234abcd);
170 test("0|001| 12|+123| 1234|-123|-1234", "%d|%03d|%3d|%+d|% d|%+d|% d", 0, 1, 12, 123, 1234, -123, -1234);
171 NOWARN(-Wformat, "Intentionally test narrowing conversion specifiers.", {
172 test("0|1|1|128|255", "%hhu|%hhu|%hhu|%hhu|%hhu", 0, 1, 257, 128, -1);
173 test("0|1|1|-128|-1", "%hhd|%hhd|%hhd|%hhd|%hhd", 0, 1, 257, 128, -1);
174 test("2015122420151225", "%ho%ho%#ho", 1037, 5282, -11627);
175 })
176 /*
177 * POSIX/C99: »The result of converting zero with an explicit
178 * precision of zero shall be no characters.« Hence the output
179 * from the below test should really be "00|0||| ". However,
180 * the kernel's printf also produces a single 0 in that
181 * case. This test case simply documents the current
182 * behaviour.
183 */
184 test("00|0|0|0|0", "%.2d|%.1d|%.0d|%.*d|%1.0d", 0, 0, 0, 0, 0, 0);
185 }
186
187 static void
test_string(struct kunit * kunittest)188 test_string(struct kunit *kunittest)
189 {
190 test("", "%s%.0s", "", "123");
191 test("ABCD|abc|123", "%s|%.3s|%.*s", "ABCD", "abcdef", 3, "123456");
192 test("1 | 2|3 | 4|5 ", "%-3s|%3s|%-*s|%*s|%*s", "1", "2", 3, "3", 3, "4", -3, "5");
193 test("1234 ", "%-10.4s", "123456");
194 test(" 1234", "%10.4s", "123456");
195 /*
196 * POSIX and C99 say that a negative precision (which is only
197 * possible to pass via a * argument) should be treated as if
198 * the precision wasn't present, and that if the precision is
199 * omitted (as in %.s), the precision should be taken to be
200 * 0. However, the kernel's printf behave exactly opposite,
201 * treating a negative precision as 0 and treating an omitted
202 * precision specifier as if no precision was given.
203 *
204 * These test cases document the current behaviour; should
205 * anyone ever feel the need to follow the standards more
206 * closely, this can be revisited.
207 */
208 test(" ", "%4.*s", -5, "123456");
209 test("123456", "%.s", "123456");
210 test("a||", "%.s|%.0s|%.*s", "a", "b", 0, "c");
211 test("a | | ", "%-3.s|%-3.0s|%-3.*s", "a", "b", 0, "c");
212 }
213
214 #define PLAIN_BUF_SIZE 64 /* leave some space so we don't oops */
215
216 #if BITS_PER_LONG == 64
217
218 #define PTR_WIDTH 16
219 #define PTR ((void *)0xffff0123456789abUL)
220 #define PTR_STR "ffff0123456789ab"
221 #define PTR_VAL_NO_CRNG "(____ptrval____)"
222 #define ZEROS "00000000" /* hex 32 zero bits */
223 #define ONES "ffffffff" /* hex 32 one bits */
224
225 #else
226
227 #define PTR_WIDTH 8
228 #define PTR ((void *)0x456789ab)
229 #define PTR_STR "456789ab"
230 #define PTR_VAL_NO_CRNG "(ptrval)"
231 #define ZEROS ""
232 #define ONES ""
233
234 #endif /* BITS_PER_LONG == 64 */
235
236 static void
plain_hash_to_buffer(struct kunit * kunittest,const void * p,char * buf,size_t len)237 plain_hash_to_buffer(struct kunit *kunittest, const void *p, char *buf, size_t len)
238 {
239 KUNIT_ASSERT_EQ(kunittest, snprintf(buf, len, "%p", p), PTR_WIDTH);
240
241 if (strncmp(buf, PTR_VAL_NO_CRNG, PTR_WIDTH) == 0) {
242 kunit_skip(kunittest,
243 "crng possibly not yet initialized. plain 'p' buffer contains \"%s\"\n",
244 PTR_VAL_NO_CRNG);
245 }
246 }
247
248 static void
hash_pointer(struct kunit * kunittest)249 hash_pointer(struct kunit *kunittest)
250 {
251 if (no_hash_pointers)
252 kunit_skip(kunittest, "hash pointers disabled");
253
254 char buf[PLAIN_BUF_SIZE];
255
256 plain_hash_to_buffer(kunittest, PTR, buf, PLAIN_BUF_SIZE);
257
258 /*
259 * The hash of %p is unpredictable, therefore test() cannot be used.
260 *
261 * Instead verify that the first 32 bits are zeros on a 64-bit system
262 * and that the non-hashed value is not printed.
263 */
264
265 KUNIT_EXPECT_MEMEQ(kunittest, buf, ZEROS, strlen(ZEROS));
266 KUNIT_EXPECT_MEMNEQ(kunittest, buf, PTR_STR, PTR_WIDTH);
267 }
268
269 static void
test_hashed(struct kunit * kunittest,const char * fmt,const void * p)270 test_hashed(struct kunit *kunittest, const char *fmt, const void *p)
271 {
272 char buf[PLAIN_BUF_SIZE];
273
274 plain_hash_to_buffer(kunittest, p, buf, PLAIN_BUF_SIZE);
275
276 test(buf, fmt, p);
277 }
278
279 /*
280 * NULL pointers aren't hashed.
281 */
282 static void
null_pointer(struct kunit * kunittest)283 null_pointer(struct kunit *kunittest)
284 {
285 test(ZEROS "00000000", "%p", NULL);
286 test(ZEROS "00000000", "%px", NULL);
287 test("(null)", "%pE", NULL);
288 }
289
290 /*
291 * Error pointers aren't hashed.
292 */
293 static void
error_pointer(struct kunit * kunittest)294 error_pointer(struct kunit *kunittest)
295 {
296 test(ONES "fffffff5", "%p", ERR_PTR(-11));
297 test(ONES "fffffff5", "%px", ERR_PTR(-11));
298 test("(efault)", "%pE", ERR_PTR(-11));
299 }
300
301 #define PTR_INVALID ((void *)0x000000ab)
302
303 static void
invalid_pointer(struct kunit * kunittest)304 invalid_pointer(struct kunit *kunittest)
305 {
306 test_hashed(kunittest, "%p", PTR_INVALID);
307 test(ZEROS "000000ab", "%px", PTR_INVALID);
308 test("(efault)", "%pE", PTR_INVALID);
309 }
310
311 static void
symbol_ptr(struct kunit * kunittest)312 symbol_ptr(struct kunit *kunittest)
313 {
314 }
315
316 static void
kernel_ptr(struct kunit * kunittest)317 kernel_ptr(struct kunit *kunittest)
318 {
319 /* We can't test this without access to kptr_restrict. */
320 }
321
322 static void
struct_resource(struct kunit * kunittest)323 struct_resource(struct kunit *kunittest)
324 {
325 struct resource test_resource = {
326 .start = 0xc0ffee00,
327 .end = 0xc0ffee00,
328 .flags = IORESOURCE_MEM,
329 };
330
331 test("[mem 0xc0ffee00 flags 0x200]",
332 "%pr", &test_resource);
333
334 test_resource = (struct resource) {
335 .start = 0xc0ffee,
336 .end = 0xba5eba11,
337 .flags = IORESOURCE_MEM,
338 };
339 test("[mem 0x00c0ffee-0xba5eba11 flags 0x200]",
340 "%pr", &test_resource);
341
342 test_resource = (struct resource) {
343 .start = 0xba5eba11,
344 .end = 0xc0ffee,
345 .flags = IORESOURCE_MEM,
346 };
347 test("[mem 0xba5eba11-0x00c0ffee flags 0x200]",
348 "%pr", &test_resource);
349
350 test_resource = (struct resource) {
351 .start = 0xba5eba11,
352 .end = 0xba5eca11,
353 .flags = IORESOURCE_MEM,
354 };
355
356 test("[mem 0xba5eba11-0xba5eca11 flags 0x200]",
357 "%pr", &test_resource);
358
359 test_resource = (struct resource) {
360 .start = 0xba11,
361 .end = 0xca10,
362 .flags = IORESOURCE_IO |
363 IORESOURCE_DISABLED |
364 IORESOURCE_UNSET,
365 };
366
367 test("[io size 0x1000 disabled]",
368 "%pR", &test_resource);
369 }
370
371 static void
struct_range(struct kunit * kunittest)372 struct_range(struct kunit *kunittest)
373 {
374 struct range test_range = DEFINE_RANGE(0xc0ffee00ba5eba11,
375 0xc0ffee00ba5eba11);
376 test("[range 0xc0ffee00ba5eba11]", "%pra", &test_range);
377
378 test_range = DEFINE_RANGE(0xc0ffee, 0xba5eba11);
379 test("[range 0x0000000000c0ffee-0x00000000ba5eba11]",
380 "%pra", &test_range);
381
382 test_range = DEFINE_RANGE(0xba5eba11, 0xc0ffee);
383 test("[range 0x00000000ba5eba11-0x0000000000c0ffee]",
384 "%pra", &test_range);
385 }
386
387 static void
addr(struct kunit * kunittest)388 addr(struct kunit *kunittest)
389 {
390 }
391
392 static void
escaped_str(struct kunit * kunittest)393 escaped_str(struct kunit *kunittest)
394 {
395 }
396
397 static void
hex_string(struct kunit * kunittest)398 hex_string(struct kunit *kunittest)
399 {
400 const char buf[3] = {0xc0, 0xff, 0xee};
401
402 test("c0 ff ee|c0:ff:ee|c0-ff-ee|c0ffee",
403 "%3ph|%3phC|%3phD|%3phN", buf, buf, buf, buf);
404 test("c0 ff ee|c0:ff:ee|c0-ff-ee|c0ffee",
405 "%*ph|%*phC|%*phD|%*phN", 3, buf, 3, buf, 3, buf, 3, buf);
406 }
407
408 static void
mac(struct kunit * kunittest)409 mac(struct kunit *kunittest)
410 {
411 const u8 addr[6] = {0x2d, 0x48, 0xd6, 0xfc, 0x7a, 0x05};
412
413 test("2d:48:d6:fc:7a:05", "%pM", addr);
414 test("05:7a:fc:d6:48:2d", "%pMR", addr);
415 test("2d-48-d6-fc-7a-05", "%pMF", addr);
416 test("2d48d6fc7a05", "%pm", addr);
417 test("057afcd6482d", "%pmR", addr);
418 }
419
420 static void
ip4(struct kunit * kunittest)421 ip4(struct kunit *kunittest)
422 {
423 struct sockaddr_in sa;
424
425 sa.sin_family = AF_INET;
426 sa.sin_port = cpu_to_be16(12345);
427 sa.sin_addr.s_addr = cpu_to_be32(0x7f000001);
428
429 test("127.000.000.001|127.0.0.1", "%pi4|%pI4", &sa.sin_addr, &sa.sin_addr);
430 test("127.000.000.001|127.0.0.1", "%piS|%pIS", &sa, &sa);
431 sa.sin_addr.s_addr = cpu_to_be32(0x01020304);
432 test("001.002.003.004:12345|1.2.3.4:12345", "%piSp|%pISp", &sa, &sa);
433 }
434
435 static void
ip6(struct kunit * kunittest)436 ip6(struct kunit *kunittest)
437 {
438 }
439
440 static void
uuid(struct kunit * kunittest)441 uuid(struct kunit *kunittest)
442 {
443 const char uuid[16] = {0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7,
444 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf};
445
446 test("00010203-0405-0607-0809-0a0b0c0d0e0f", "%pUb", uuid);
447 test("00010203-0405-0607-0809-0A0B0C0D0E0F", "%pUB", uuid);
448 test("03020100-0504-0706-0809-0a0b0c0d0e0f", "%pUl", uuid);
449 test("03020100-0504-0706-0809-0A0B0C0D0E0F", "%pUL", uuid);
450 }
451
452 static struct dentry test_dentry[4] = {
453 { .d_parent = &test_dentry[0],
454 .d_name = QSTR_INIT(test_dentry[0].d_iname, 3),
455 .d_iname = "foo" },
456 { .d_parent = &test_dentry[0],
457 .d_name = QSTR_INIT(test_dentry[1].d_iname, 5),
458 .d_iname = "bravo" },
459 { .d_parent = &test_dentry[1],
460 .d_name = QSTR_INIT(test_dentry[2].d_iname, 4),
461 .d_iname = "alfa" },
462 { .d_parent = &test_dentry[2],
463 .d_name = QSTR_INIT(test_dentry[3].d_iname, 5),
464 .d_iname = "romeo" },
465 };
466
467 static void
dentry(struct kunit * kunittest)468 dentry(struct kunit *kunittest)
469 {
470 test("foo", "%pd", &test_dentry[0]);
471 test("foo", "%pd2", &test_dentry[0]);
472
473 test("(null)", "%pd", NULL);
474 test("(efault)", "%pd", PTR_INVALID);
475 test("(null)", "%pD", NULL);
476 test("(efault)", "%pD", PTR_INVALID);
477
478 test("romeo", "%pd", &test_dentry[3]);
479 test("alfa/romeo", "%pd2", &test_dentry[3]);
480 test("bravo/alfa/romeo", "%pd3", &test_dentry[3]);
481 test("/bravo/alfa/romeo", "%pd4", &test_dentry[3]);
482 test("/bravo/alfa", "%pd4", &test_dentry[2]);
483
484 test("bravo/alfa |bravo/alfa ", "%-12pd2|%*pd2", &test_dentry[2], -12, &test_dentry[2]);
485 test(" bravo/alfa| bravo/alfa", "%12pd2|%*pd2", &test_dentry[2], 12, &test_dentry[2]);
486 }
487
488 static void
struct_va_format(struct kunit * kunittest)489 struct_va_format(struct kunit *kunittest)
490 {
491 }
492
493 static void
time_and_date(struct kunit * kunittest)494 time_and_date(struct kunit *kunittest)
495 {
496 /* 1543210543 */
497 const struct rtc_time tm = {
498 .tm_sec = 43,
499 .tm_min = 35,
500 .tm_hour = 5,
501 .tm_mday = 26,
502 .tm_mon = 10,
503 .tm_year = 118,
504 };
505 /* 2019-01-04T15:32:23 */
506 time64_t t = 1546615943;
507 struct timespec64 ts = { .tv_sec = t, .tv_nsec = 11235813 };
508
509 test("(%pt?)", "%pt", &tm);
510 test("2018-11-26T05:35:43", "%ptR", &tm);
511 test("0118-10-26T05:35:43", "%ptRr", &tm);
512 test("05:35:43|2018-11-26", "%ptRt|%ptRd", &tm, &tm);
513 test("05:35:43|0118-10-26", "%ptRtr|%ptRdr", &tm, &tm);
514 test("05:35:43|2018-11-26", "%ptRttr|%ptRdtr", &tm, &tm);
515 test("05:35:43 tr|2018-11-26 tr", "%ptRt tr|%ptRd tr", &tm, &tm);
516
517 test("2019-01-04T15:32:23", "%ptT", &t);
518 test("0119-00-04T15:32:23", "%ptTr", &t);
519 test("15:32:23|2019-01-04", "%ptTt|%ptTd", &t, &t);
520 test("15:32:23|0119-00-04", "%ptTtr|%ptTdr", &t, &t);
521
522 test("2019-01-04 15:32:23", "%ptTs", &t);
523 test("0119-00-04 15:32:23", "%ptTsr", &t);
524 test("15:32:23|2019-01-04", "%ptTts|%ptTds", &t, &t);
525 test("15:32:23|0119-00-04", "%ptTtrs|%ptTdrs", &t, &t);
526
527 test("2019-01-04T15:32:23.011235813", "%ptS", &ts);
528 test("1546615943.011235813", "%ptSp", &ts);
529 }
530
531 static void
struct_clk(struct kunit * kunittest)532 struct_clk(struct kunit *kunittest)
533 {
534 }
535
536 static void
large_bitmap(struct kunit * kunittest)537 large_bitmap(struct kunit *kunittest)
538 {
539 const int nbits = 1 << 16;
540 unsigned long *bits = bitmap_zalloc(nbits, GFP_KERNEL);
541 if (!bits)
542 return;
543
544 bitmap_set(bits, 1, 20);
545 bitmap_set(bits, 60000, 15);
546 test("1-20,60000-60014", "%*pbl", nbits, bits);
547 bitmap_free(bits);
548 }
549
550 static void
bitmap(struct kunit * kunittest)551 bitmap(struct kunit *kunittest)
552 {
553 DECLARE_BITMAP(bits, 20);
554 const int primes[] = {2,3,5,7,11,13,17,19};
555 int i;
556
557 bitmap_zero(bits, 20);
558 test("00000|00000", "%20pb|%*pb", bits, 20, bits);
559 test("|", "%20pbl|%*pbl", bits, 20, bits);
560
561 for (i = 0; i < ARRAY_SIZE(primes); ++i)
562 set_bit(primes[i], bits);
563 test("a28ac|a28ac", "%20pb|%*pb", bits, 20, bits);
564 test("2-3,5,7,11,13,17,19|2-3,5,7,11,13,17,19", "%20pbl|%*pbl", bits, 20, bits);
565
566 bitmap_fill(bits, 20);
567 test("fffff|fffff", "%20pb|%*pb", bits, 20, bits);
568 test("0-19|0-19", "%20pbl|%*pbl", bits, 20, bits);
569
570 large_bitmap(kunittest);
571 }
572
573 static void
netdev_features(struct kunit * kunittest)574 netdev_features(struct kunit *kunittest)
575 {
576 }
577
578 struct page_flags_test {
579 int width;
580 int shift;
581 int mask;
582 const char *fmt;
583 const char *name;
584 };
585
586 static const struct page_flags_test pft[] = {
587 {SECTIONS_WIDTH, SECTIONS_PGSHIFT, SECTIONS_MASK,
588 "%d", "section"},
589 {NODES_WIDTH, NODES_PGSHIFT, NODES_MASK,
590 "%d", "node"},
591 {ZONES_WIDTH, ZONES_PGSHIFT, ZONES_MASK,
592 "%d", "zone"},
593 {LAST_CPUPID_WIDTH, LAST_CPUPID_PGSHIFT, LAST_CPUPID_MASK,
594 "%#x", "lastcpupid"},
595 {KASAN_TAG_WIDTH, KASAN_TAG_PGSHIFT, KASAN_TAG_MASK,
596 "%#x", "kasantag"},
597 };
598
599 static void
page_flags_test(struct kunit * kunittest,int section,int node,int zone,int last_cpupid,int kasan_tag,unsigned long flags,const char * name,char * cmp_buf)600 page_flags_test(struct kunit *kunittest, int section, int node, int zone,
601 int last_cpupid, int kasan_tag, unsigned long flags, const char *name,
602 char *cmp_buf)
603 {
604 unsigned long values[] = {section, node, zone, last_cpupid, kasan_tag};
605 unsigned long size;
606 bool append = false;
607 int i;
608
609 for (i = 0; i < ARRAY_SIZE(values); i++)
610 flags |= (values[i] & pft[i].mask) << pft[i].shift;
611
612 size = scnprintf(cmp_buf, BUF_SIZE, "%#lx(", flags);
613 if (flags & PAGEFLAGS_MASK) {
614 size += scnprintf(cmp_buf + size, BUF_SIZE - size, "%s", name);
615 append = true;
616 }
617
618 for (i = 0; i < ARRAY_SIZE(pft); i++) {
619 if (!pft[i].width)
620 continue;
621
622 if (append)
623 size += scnprintf(cmp_buf + size, BUF_SIZE - size, "|");
624
625 size += scnprintf(cmp_buf + size, BUF_SIZE - size, "%s=",
626 pft[i].name);
627 size += scnprintf(cmp_buf + size, BUF_SIZE - size, pft[i].fmt,
628 values[i] & pft[i].mask);
629 append = true;
630 }
631
632 snprintf(cmp_buf + size, BUF_SIZE - size, ")");
633
634 test(cmp_buf, "%pGp", &flags);
635 }
636
637 static void
flags(struct kunit * kunittest)638 flags(struct kunit *kunittest)
639 {
640 unsigned long flags;
641 char *cmp_buffer;
642 gfp_t gfp;
643
644 cmp_buffer = kunit_kmalloc(kunittest, BUF_SIZE, GFP_KERNEL);
645 KUNIT_ASSERT_NOT_NULL(kunittest, cmp_buffer);
646
647 flags = 0;
648 page_flags_test(kunittest, 0, 0, 0, 0, 0, flags, "", cmp_buffer);
649
650 flags = 1UL << NR_PAGEFLAGS;
651 page_flags_test(kunittest, 0, 0, 0, 0, 0, flags, "", cmp_buffer);
652
653 flags |= 1UL << PG_uptodate | 1UL << PG_dirty | 1UL << PG_lru
654 | 1UL << PG_active | 1UL << PG_swapbacked;
655 page_flags_test(kunittest, 1, 1, 1, 0x1fffff, 1, flags,
656 "uptodate|dirty|lru|active|swapbacked",
657 cmp_buffer);
658
659 flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC;
660 test("read|exec|mayread|maywrite|mayexec", "%pGv", &flags);
661
662 gfp = GFP_TRANSHUGE;
663 test("GFP_TRANSHUGE", "%pGg", &gfp);
664
665 gfp = GFP_ATOMIC|__GFP_DMA;
666 test("GFP_ATOMIC|GFP_DMA", "%pGg", &gfp);
667
668 gfp = __GFP_HIGH;
669 test("__GFP_HIGH", "%pGg", &gfp);
670
671 /* Any flags not translated by the table should remain numeric */
672 gfp = ~__GFP_BITS_MASK;
673 snprintf(cmp_buffer, BUF_SIZE, "%#lx", (unsigned long) gfp);
674 test(cmp_buffer, "%pGg", &gfp);
675
676 snprintf(cmp_buffer, BUF_SIZE, "__GFP_HIGH|%#lx",
677 (unsigned long) gfp);
678 gfp |= __GFP_HIGH;
679 test(cmp_buffer, "%pGg", &gfp);
680 }
681
fwnode_pointer(struct kunit * kunittest)682 static void fwnode_pointer(struct kunit *kunittest)
683 {
684 const struct software_node first = { .name = "first" };
685 const struct software_node second = { .name = "second", .parent = &first };
686 const struct software_node third = { .name = "third", .parent = &second };
687 const struct software_node *group[] = { &first, &second, &third, NULL };
688 const char * const full_name_second = "first/second";
689 const char * const full_name_third = "first/second/third";
690 const char * const second_name = "second";
691 const char * const third_name = "third";
692 int rval;
693
694 rval = software_node_register_node_group(group);
695 if (rval) {
696 kunit_skip(kunittest, "cannot register softnodes; rval %d\n", rval);
697 }
698
699 test(full_name_second, "%pfw", software_node_fwnode(&second));
700 test(full_name_third, "%pfw", software_node_fwnode(&third));
701 test(full_name_third, "%pfwf", software_node_fwnode(&third));
702 test(second_name, "%pfwP", software_node_fwnode(&second));
703 test(third_name, "%pfwP", software_node_fwnode(&third));
704
705 software_node_unregister_node_group(group);
706 }
707
708 struct fourcc_struct {
709 u32 code;
710 const char *str;
711 };
712
fourcc_pointer_test(struct kunit * kunittest,const struct fourcc_struct * fc,size_t n,const char * fmt)713 static void fourcc_pointer_test(struct kunit *kunittest, const struct fourcc_struct *fc,
714 size_t n, const char *fmt)
715 {
716 size_t i;
717
718 for (i = 0; i < n; i++)
719 test(fc[i].str, fmt, &fc[i].code);
720 }
721
fourcc_pointer(struct kunit * kunittest)722 static void fourcc_pointer(struct kunit *kunittest)
723 {
724 static const struct fourcc_struct try_cc[] = {
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 static const struct fourcc_struct try_ch[] = {
731 { 0x41424344, "ABCD (0x41424344)", },
732 };
733 static const struct fourcc_struct try_chR[] = {
734 { 0x41424344, "DCBA (0x44434241)", },
735 };
736 static const struct fourcc_struct try_cl[] = {
737 { (__force u32)cpu_to_le32(0x41424344), "ABCD (0x41424344)", },
738 };
739 static const struct fourcc_struct try_cb[] = {
740 { (__force u32)cpu_to_be32(0x41424344), "ABCD (0x41424344)", },
741 };
742
743 fourcc_pointer_test(kunittest, try_cc, ARRAY_SIZE(try_cc), "%p4cc");
744 fourcc_pointer_test(kunittest, try_ch, ARRAY_SIZE(try_ch), "%p4ch");
745 fourcc_pointer_test(kunittest, try_chR, ARRAY_SIZE(try_chR), "%p4chR");
746 fourcc_pointer_test(kunittest, try_cl, ARRAY_SIZE(try_cl), "%p4cl");
747 fourcc_pointer_test(kunittest, try_cb, ARRAY_SIZE(try_cb), "%p4cb");
748 }
749
750 static void
errptr(struct kunit * kunittest)751 errptr(struct kunit *kunittest)
752 {
753 test("-1234", "%pe", ERR_PTR(-1234));
754
755 /* Check that %pe with a non-ERR_PTR gets treated as ordinary %p. */
756 BUILD_BUG_ON(IS_ERR(PTR));
757 test_hashed(kunittest, "%pe", PTR);
758
759 #ifdef CONFIG_SYMBOLIC_ERRNAME
760 test("(-ENOTSOCK)", "(%pe)", ERR_PTR(-ENOTSOCK));
761 test("(-EAGAIN)", "(%pe)", ERR_PTR(-EAGAIN));
762 BUILD_BUG_ON(EAGAIN != EWOULDBLOCK);
763 test("(-EAGAIN)", "(%pe)", ERR_PTR(-EWOULDBLOCK));
764 test("[-EIO ]", "[%-8pe]", ERR_PTR(-EIO));
765 test("[ -EIO]", "[%8pe]", ERR_PTR(-EIO));
766 test("-EPROBE_DEFER", "%pe", ERR_PTR(-EPROBE_DEFER));
767 #endif
768 }
769
printf_suite_init(struct kunit_suite * suite)770 static int printf_suite_init(struct kunit_suite *suite)
771 {
772 total_tests = 0;
773
774 alloced_buffer = kmalloc(BUF_SIZE + 2*PAD_SIZE, GFP_KERNEL);
775 if (!alloced_buffer)
776 return -ENOMEM;
777 test_buffer = alloced_buffer + PAD_SIZE;
778
779 return 0;
780 }
781
printf_suite_exit(struct kunit_suite * suite)782 static void printf_suite_exit(struct kunit_suite *suite)
783 {
784 kfree(alloced_buffer);
785
786 kunit_info(suite, "ran %u tests\n", total_tests);
787 }
788
789 static struct kunit_case printf_test_cases[] = {
790 KUNIT_CASE(test_basic),
791 KUNIT_CASE(test_number),
792 KUNIT_CASE(test_string),
793 KUNIT_CASE(hash_pointer),
794 KUNIT_CASE(null_pointer),
795 KUNIT_CASE(error_pointer),
796 KUNIT_CASE(invalid_pointer),
797 KUNIT_CASE(symbol_ptr),
798 KUNIT_CASE(kernel_ptr),
799 KUNIT_CASE(struct_resource),
800 KUNIT_CASE(struct_range),
801 KUNIT_CASE(addr),
802 KUNIT_CASE(escaped_str),
803 KUNIT_CASE(hex_string),
804 KUNIT_CASE(mac),
805 KUNIT_CASE(ip4),
806 KUNIT_CASE(ip6),
807 KUNIT_CASE(uuid),
808 KUNIT_CASE(dentry),
809 KUNIT_CASE(struct_va_format),
810 KUNIT_CASE(time_and_date),
811 KUNIT_CASE(struct_clk),
812 KUNIT_CASE(bitmap),
813 KUNIT_CASE(netdev_features),
814 KUNIT_CASE(flags),
815 KUNIT_CASE(errptr),
816 KUNIT_CASE(fwnode_pointer),
817 KUNIT_CASE(fourcc_pointer),
818 {}
819 };
820
821 static struct kunit_suite printf_test_suite = {
822 .name = "printf",
823 .suite_init = printf_suite_init,
824 .suite_exit = printf_suite_exit,
825 .test_cases = printf_test_cases,
826 };
827
828 kunit_test_suite(printf_test_suite);
829
830 MODULE_AUTHOR("Rasmus Villemoes <linux@rasmusvillemoes.dk>");
831 MODULE_DESCRIPTION("Test cases for printf facility");
832 MODULE_LICENSE("GPL");
833