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1/*
2 * Test cases for printf facility.
3 */
4
5#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
6
7#include <linux/init.h>
8#include <linux/kernel.h>
9#include <linux/module.h>
10#include <linux/printk.h>
11#include <linux/random.h>
12#include <linux/slab.h>
13#include <linux/string.h>
14
15#include <linux/bitmap.h>
16#include <linux/dcache.h>
17#include <linux/socket.h>
18#include <linux/in.h>
19
20#include <linux/gfp.h>
21#include <linux/mm.h>
22
23#define BUF_SIZE 256
24#define PAD_SIZE 16
25#define FILL_CHAR '$'
26
27#define PTR1 ((void*)0x01234567)
28#define PTR2 ((void*)(long)(int)0xfedcba98)
29
30#if BITS_PER_LONG == 64
31#define PTR1_ZEROES "000000000"
32#define PTR1_SPACES " "
33#define PTR1_STR "1234567"
34#define PTR2_STR "fffffffffedcba98"
35#define PTR_WIDTH 16
36#else
37#define PTR1_ZEROES "0"
38#define PTR1_SPACES " "
39#define PTR1_STR "1234567"
40#define PTR2_STR "fedcba98"
41#define PTR_WIDTH 8
42#endif
43#define PTR_WIDTH_STR stringify(PTR_WIDTH)
44
45static unsigned total_tests __initdata;
46static unsigned failed_tests __initdata;
47static char *test_buffer __initdata;
48static char *alloced_buffer __initdata;
49
50static int __printf(4, 0) __init
51do_test(int bufsize, const char *expect, int elen,
52 const char *fmt, va_list ap)
53{
54 va_list aq;
55 int ret, written;
56
57 total_tests++;
58
59 memset(alloced_buffer, FILL_CHAR, BUF_SIZE + 2*PAD_SIZE);
60 va_copy(aq, ap);
61 ret = vsnprintf(test_buffer, bufsize, fmt, aq);
62 va_end(aq);
63
64 if (ret != elen) {
65 pr_warn("vsnprintf(buf, %d, \"%s\", ...) returned %d, expected %d\n",
66 bufsize, fmt, ret, elen);
67 return 1;
68 }
69
70 if (memchr_inv(alloced_buffer, FILL_CHAR, PAD_SIZE)) {
71 pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote before buffer\n", bufsize, fmt);
72 return 1;
73 }
74
75 if (!bufsize) {
76 if (memchr_inv(test_buffer, FILL_CHAR, BUF_SIZE + PAD_SIZE)) {
77 pr_warn("vsnprintf(buf, 0, \"%s\", ...) wrote to buffer\n",
78 fmt);
79 return 1;
80 }
81 return 0;
82 }
83
84 written = min(bufsize-1, elen);
85 if (test_buffer[written]) {
86 pr_warn("vsnprintf(buf, %d, \"%s\", ...) did not nul-terminate buffer\n",
87 bufsize, fmt);
88 return 1;
89 }
90
91 if (memchr_inv(test_buffer + written + 1, FILL_CHAR, BUF_SIZE + PAD_SIZE - (written + 1))) {
92 pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote beyond the nul-terminator\n",
93 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
105static void __printf(3, 4) __init
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 = 1 + prandom_u32_max(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
149static void __init
150test_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
161static void __init
162test_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 test("0|1|1|128|255", "%hhu|%hhu|%hhu|%hhu|%hhu", 0, 1, 257, 128, -1);
168 test("0|1|1|-128|-1", "%hhd|%hhd|%hhd|%hhd|%hhd", 0, 1, 257, 128, -1);
169 test("2015122420151225", "%ho%ho%#ho", 1037, 5282, -11627);
170 /*
171 * POSIX/C99: »The result of converting zero with an explicit
172 * precision of zero shall be no characters.« Hence the output
173 * from the below test should really be "00|0||| ". However,
174 * the kernel's printf also produces a single 0 in that
175 * case. This test case simply documents the current
176 * behaviour.
177 */
178 test("00|0|0|0|0", "%.2d|%.1d|%.0d|%.*d|%1.0d", 0, 0, 0, 0, 0, 0);
179#ifndef __CHAR_UNSIGNED__
180 {
181 /*
182 * Passing a 'char' to a %02x specifier doesn't do
183 * what was presumably the intention when char is
184 * signed and the value is negative. One must either &
185 * with 0xff or cast to u8.
186 */
187 char val = -16;
188 test("0xfffffff0|0xf0|0xf0", "%#02x|%#02x|%#02x", val, val & 0xff, (u8)val);
189 }
190#endif
191}
192
193static void __init
194test_string(void)
195{
196 test("", "%s%.0s", "", "123");
197 test("ABCD|abc|123", "%s|%.3s|%.*s", "ABCD", "abcdef", 3, "123456");
198 test("1 | 2|3 | 4|5 ", "%-3s|%3s|%-*s|%*s|%*s", "1", "2", 3, "3", 3, "4", -3, "5");
199 test("1234 ", "%-10.4s", "123456");
200 test(" 1234", "%10.4s", "123456");
201 /*
202 * POSIX and C99 say that a negative precision (which is only
203 * possible to pass via a * argument) should be treated as if
204 * the precision wasn't present, and that if the precision is
205 * omitted (as in %.s), the precision should be taken to be
206 * 0. However, the kernel's printf behave exactly opposite,
207 * treating a negative precision as 0 and treating an omitted
208 * precision specifier as if no precision was given.
209 *
210 * These test cases document the current behaviour; should
211 * anyone ever feel the need to follow the standards more
212 * closely, this can be revisited.
213 */
214 test(" ", "%4.*s", -5, "123456");
215 test("123456", "%.s", "123456");
216 test("a||", "%.s|%.0s|%.*s", "a", "b", 0, "c");
217 test("a | | ", "%-3.s|%-3.0s|%-3.*s", "a", "b", 0, "c");
218}
219
220static void __init
221plain(void)
222{
223 test(PTR1_ZEROES PTR1_STR " " PTR2_STR, "%p %p", PTR1, PTR2);
224 /*
225 * The field width is overloaded for some %p extensions to
226 * pass another piece of information. For plain pointers, the
227 * behaviour is slightly odd: One cannot pass either the 0
228 * flag nor a precision to %p without gcc complaining, and if
229 * one explicitly gives a field width, the number is no longer
230 * zero-padded.
231 */
232 test("|" PTR1_STR PTR1_SPACES " | " PTR1_SPACES PTR1_STR "|",
233 "|%-*p|%*p|", PTR_WIDTH+2, PTR1, PTR_WIDTH+2, PTR1);
234 test("|" PTR2_STR " | " PTR2_STR "|",
235 "|%-*p|%*p|", PTR_WIDTH+2, PTR2, PTR_WIDTH+2, PTR2);
236
237 /*
238 * Unrecognized %p extensions are treated as plain %p, but the
239 * alphanumeric suffix is ignored (that is, does not occur in
240 * the output.)
241 */
242 test("|"PTR1_ZEROES PTR1_STR"|", "|%p0y|", PTR1);
243 test("|"PTR2_STR"|", "|%p0y|", PTR2);
244}
245
246static void __init
247symbol_ptr(void)
248{
249}
250
251static void __init
252kernel_ptr(void)
253{
254}
255
256static void __init
257struct_resource(void)
258{
259}
260
261static void __init
262addr(void)
263{
264}
265
266static void __init
267escaped_str(void)
268{
269}
270
271static void __init
272hex_string(void)
273{
274 const char buf[3] = {0xc0, 0xff, 0xee};
275
276 test("c0 ff ee|c0:ff:ee|c0-ff-ee|c0ffee",
277 "%3ph|%3phC|%3phD|%3phN", buf, buf, buf, buf);
278 test("c0 ff ee|c0:ff:ee|c0-ff-ee|c0ffee",
279 "%*ph|%*phC|%*phD|%*phN", 3, buf, 3, buf, 3, buf, 3, buf);
280}
281
282static void __init
283mac(void)
284{
285 const u8 addr[6] = {0x2d, 0x48, 0xd6, 0xfc, 0x7a, 0x05};
286
287 test("2d:48:d6:fc:7a:05", "%pM", addr);
288 test("05:7a:fc:d6:48:2d", "%pMR", addr);
289 test("2d-48-d6-fc-7a-05", "%pMF", addr);
290 test("2d48d6fc7a05", "%pm", addr);
291 test("057afcd6482d", "%pmR", addr);
292}
293
294static void __init
295ip4(void)
296{
297 struct sockaddr_in sa;
298
299 sa.sin_family = AF_INET;
300 sa.sin_port = cpu_to_be16(12345);
301 sa.sin_addr.s_addr = cpu_to_be32(0x7f000001);
302
303 test("127.000.000.001|127.0.0.1", "%pi4|%pI4", &sa.sin_addr, &sa.sin_addr);
304 test("127.000.000.001|127.0.0.1", "%piS|%pIS", &sa, &sa);
305 sa.sin_addr.s_addr = cpu_to_be32(0x01020304);
306 test("001.002.003.004:12345|1.2.3.4:12345", "%piSp|%pISp", &sa, &sa);
307}
308
309static void __init
310ip6(void)
311{
312}
313
314static void __init
315ip(void)
316{
317 ip4();
318 ip6();
319}
320
321static void __init
322uuid(void)
323{
324 const char uuid[16] = {0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7,
325 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf};
326
327 test("00010203-0405-0607-0809-0a0b0c0d0e0f", "%pUb", uuid);
328 test("00010203-0405-0607-0809-0A0B0C0D0E0F", "%pUB", uuid);
329 test("03020100-0504-0706-0809-0a0b0c0d0e0f", "%pUl", uuid);
330 test("03020100-0504-0706-0809-0A0B0C0D0E0F", "%pUL", uuid);
331}
332
333static struct dentry test_dentry[4] __initdata = {
334 { .d_parent = &test_dentry[0],
335 .d_name = QSTR_INIT(test_dentry[0].d_iname, 3),
336 .d_iname = "foo" },
337 { .d_parent = &test_dentry[0],
338 .d_name = QSTR_INIT(test_dentry[1].d_iname, 5),
339 .d_iname = "bravo" },
340 { .d_parent = &test_dentry[1],
341 .d_name = QSTR_INIT(test_dentry[2].d_iname, 4),
342 .d_iname = "alfa" },
343 { .d_parent = &test_dentry[2],
344 .d_name = QSTR_INIT(test_dentry[3].d_iname, 5),
345 .d_iname = "romeo" },
346};
347
348static void __init
349dentry(void)
350{
351 test("foo", "%pd", &test_dentry[0]);
352 test("foo", "%pd2", &test_dentry[0]);
353
354 test("romeo", "%pd", &test_dentry[3]);
355 test("alfa/romeo", "%pd2", &test_dentry[3]);
356 test("bravo/alfa/romeo", "%pd3", &test_dentry[3]);
357 test("/bravo/alfa/romeo", "%pd4", &test_dentry[3]);
358 test("/bravo/alfa", "%pd4", &test_dentry[2]);
359
360 test("bravo/alfa |bravo/alfa ", "%-12pd2|%*pd2", &test_dentry[2], -12, &test_dentry[2]);
361 test(" bravo/alfa| bravo/alfa", "%12pd2|%*pd2", &test_dentry[2], 12, &test_dentry[2]);
362}
363
364static void __init
365struct_va_format(void)
366{
367}
368
369static void __init
370struct_clk(void)
371{
372}
373
374static void __init
375large_bitmap(void)
376{
377 const int nbits = 1 << 16;
378 unsigned long *bits = kcalloc(BITS_TO_LONGS(nbits), sizeof(long), GFP_KERNEL);
379 if (!bits)
380 return;
381
382 bitmap_set(bits, 1, 20);
383 bitmap_set(bits, 60000, 15);
384 test("1-20,60000-60014", "%*pbl", nbits, bits);
385 kfree(bits);
386}
387
388static void __init
389bitmap(void)
390{
391 DECLARE_BITMAP(bits, 20);
392 const int primes[] = {2,3,5,7,11,13,17,19};
393 int i;
394
395 bitmap_zero(bits, 20);
396 test("00000|00000", "%20pb|%*pb", bits, 20, bits);
397 test("|", "%20pbl|%*pbl", bits, 20, bits);
398
399 for (i = 0; i < ARRAY_SIZE(primes); ++i)
400 set_bit(primes[i], bits);
401 test("a28ac|a28ac", "%20pb|%*pb", bits, 20, bits);
402 test("2-3,5,7,11,13,17,19|2-3,5,7,11,13,17,19", "%20pbl|%*pbl", bits, 20, bits);
403
404 bitmap_fill(bits, 20);
405 test("fffff|fffff", "%20pb|%*pb", bits, 20, bits);
406 test("0-19|0-19", "%20pbl|%*pbl", bits, 20, bits);
407
408 large_bitmap();
409}
410
411static void __init
412netdev_features(void)
413{
414}
415
416static void __init
417flags(void)
418{
419 unsigned long flags;
420 gfp_t gfp;
421 char *cmp_buffer;
422
423 flags = 0;
424 test("", "%pGp", &flags);
425
426 /* Page flags should filter the zone id */
427 flags = 1UL << NR_PAGEFLAGS;
428 test("", "%pGp", &flags);
429
430 flags |= 1UL << PG_uptodate | 1UL << PG_dirty | 1UL << PG_lru
431 | 1UL << PG_active | 1UL << PG_swapbacked;
432 test("uptodate|dirty|lru|active|swapbacked", "%pGp", &flags);
433
434
435 flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC
436 | VM_DENYWRITE;
437 test("read|exec|mayread|maywrite|mayexec|denywrite", "%pGv", &flags);
438
439 gfp = GFP_TRANSHUGE;
440 test("GFP_TRANSHUGE", "%pGg", &gfp);
441
442 gfp = GFP_ATOMIC|__GFP_DMA;
443 test("GFP_ATOMIC|GFP_DMA", "%pGg", &gfp);
444
445 gfp = __GFP_ATOMIC;
446 test("__GFP_ATOMIC", "%pGg", &gfp);
447
448 cmp_buffer = kmalloc(BUF_SIZE, GFP_KERNEL);
449 if (!cmp_buffer)
450 return;
451
452 /* Any flags not translated by the table should remain numeric */
453 gfp = ~__GFP_BITS_MASK;
454 snprintf(cmp_buffer, BUF_SIZE, "%#lx", (unsigned long) gfp);
455 test(cmp_buffer, "%pGg", &gfp);
456
457 snprintf(cmp_buffer, BUF_SIZE, "__GFP_ATOMIC|%#lx",
458 (unsigned long) gfp);
459 gfp |= __GFP_ATOMIC;
460 test(cmp_buffer, "%pGg", &gfp);
461
462 kfree(cmp_buffer);
463}
464
465static void __init
466test_pointer(void)
467{
468 plain();
469 symbol_ptr();
470 kernel_ptr();
471 struct_resource();
472 addr();
473 escaped_str();
474 hex_string();
475 mac();
476 ip();
477 uuid();
478 dentry();
479 struct_va_format();
480 struct_clk();
481 bitmap();
482 netdev_features();
483 flags();
484}
485
486static int __init
487test_printf_init(void)
488{
489 alloced_buffer = kmalloc(BUF_SIZE + 2*PAD_SIZE, GFP_KERNEL);
490 if (!alloced_buffer)
491 return -ENOMEM;
492 test_buffer = alloced_buffer + PAD_SIZE;
493
494 test_basic();
495 test_number();
496 test_string();
497 test_pointer();
498
499 kfree(alloced_buffer);
500
501 if (failed_tests == 0)
502 pr_info("all %u tests passed\n", total_tests);
503 else
504 pr_warn("failed %u out of %u tests\n", failed_tests, total_tests);
505
506 return failed_tests ? -EINVAL : 0;
507}
508
509module_init(test_printf_init);
510
511MODULE_AUTHOR("Rasmus Villemoes <linux@rasmusvillemoes.dk>");
512MODULE_LICENSE("GPL");
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
33static unsigned total_tests __initdata;
34static unsigned failed_tests __initdata;
35static char *test_buffer __initdata;
36static char *alloced_buffer __initdata;
37
38static int __printf(4, 0) __init
39do_test(int bufsize, const char *expect, int elen,
40 const char *fmt, va_list ap)
41{
42 va_list aq;
43 int ret, written;
44
45 total_tests++;
46
47 memset(alloced_buffer, FILL_CHAR, BUF_SIZE + 2*PAD_SIZE);
48 va_copy(aq, ap);
49 ret = vsnprintf(test_buffer, bufsize, fmt, aq);
50 va_end(aq);
51
52 if (ret != elen) {
53 pr_warn("vsnprintf(buf, %d, \"%s\", ...) returned %d, expected %d\n",
54 bufsize, fmt, ret, elen);
55 return 1;
56 }
57
58 if (memchr_inv(alloced_buffer, FILL_CHAR, PAD_SIZE)) {
59 pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote before buffer\n", bufsize, fmt);
60 return 1;
61 }
62
63 if (!bufsize) {
64 if (memchr_inv(test_buffer, FILL_CHAR, BUF_SIZE + PAD_SIZE)) {
65 pr_warn("vsnprintf(buf, 0, \"%s\", ...) wrote to buffer\n",
66 fmt);
67 return 1;
68 }
69 return 0;
70 }
71
72 written = min(bufsize-1, elen);
73 if (test_buffer[written]) {
74 pr_warn("vsnprintf(buf, %d, \"%s\", ...) did not nul-terminate buffer\n",
75 bufsize, fmt);
76 return 1;
77 }
78
79 if (memchr_inv(test_buffer + written + 1, FILL_CHAR, BUF_SIZE + PAD_SIZE - (written + 1))) {
80 pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote beyond the nul-terminator\n",
81 bufsize, fmt);
82 return 1;
83 }
84
85 if (memcmp(test_buffer, expect, written)) {
86 pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote '%s', expected '%.*s'\n",
87 bufsize, fmt, test_buffer, written, expect);
88 return 1;
89 }
90 return 0;
91}
92
93static void __printf(3, 4) __init
94__test(const char *expect, int elen, const char *fmt, ...)
95{
96 va_list ap;
97 int rand;
98 char *p;
99
100 if (elen >= BUF_SIZE) {
101 pr_err("error in test suite: expected output length %d too long. Format was '%s'.\n",
102 elen, fmt);
103 failed_tests++;
104 return;
105 }
106
107 va_start(ap, fmt);
108
109 /*
110 * Every fmt+args is subjected to four tests: Three where we
111 * tell vsnprintf varying buffer sizes (plenty, not quite
112 * enough and 0), and then we also test that kvasprintf would
113 * be able to print it as expected.
114 */
115 failed_tests += do_test(BUF_SIZE, expect, elen, fmt, ap);
116 rand = 1 + prandom_u32_max(elen+1);
117 /* Since elen < BUF_SIZE, we have 1 <= rand <= BUF_SIZE. */
118 failed_tests += do_test(rand, expect, elen, fmt, ap);
119 failed_tests += do_test(0, expect, elen, fmt, ap);
120
121 p = kvasprintf(GFP_KERNEL, fmt, ap);
122 if (p) {
123 total_tests++;
124 if (memcmp(p, expect, elen+1)) {
125 pr_warn("kvasprintf(..., \"%s\", ...) returned '%s', expected '%s'\n",
126 fmt, p, expect);
127 failed_tests++;
128 }
129 kfree(p);
130 }
131 va_end(ap);
132}
133
134#define test(expect, fmt, ...) \
135 __test(expect, strlen(expect), fmt, ##__VA_ARGS__)
136
137static void __init
138test_basic(void)
139{
140 /* Work around annoying "warning: zero-length gnu_printf format string". */
141 char nul = '\0';
142
143 test("", &nul);
144 test("100%", "100%%");
145 test("xxx%yyy", "xxx%cyyy", '%');
146 __test("xxx\0yyy", 7, "xxx%cyyy", '\0');
147}
148
149static void __init
150test_number(void)
151{
152 test("0x1234abcd ", "%#-12x", 0x1234abcd);
153 test(" 0x1234abcd", "%#12x", 0x1234abcd);
154 test("0|001| 12|+123| 1234|-123|-1234", "%d|%03d|%3d|%+d|% d|%+d|% d", 0, 1, 12, 123, 1234, -123, -1234);
155 test("0|1|1|128|255", "%hhu|%hhu|%hhu|%hhu|%hhu", 0, 1, 257, 128, -1);
156 test("0|1|1|-128|-1", "%hhd|%hhd|%hhd|%hhd|%hhd", 0, 1, 257, 128, -1);
157 test("2015122420151225", "%ho%ho%#ho", 1037, 5282, -11627);
158 /*
159 * POSIX/C99: »The result of converting zero with an explicit
160 * precision of zero shall be no characters.« Hence the output
161 * from the below test should really be "00|0||| ". However,
162 * the kernel's printf also produces a single 0 in that
163 * case. This test case simply documents the current
164 * behaviour.
165 */
166 test("00|0|0|0|0", "%.2d|%.1d|%.0d|%.*d|%1.0d", 0, 0, 0, 0, 0, 0);
167#ifndef __CHAR_UNSIGNED__
168 {
169 /*
170 * Passing a 'char' to a %02x specifier doesn't do
171 * what was presumably the intention when char is
172 * signed and the value is negative. One must either &
173 * with 0xff or cast to u8.
174 */
175 char val = -16;
176 test("0xfffffff0|0xf0|0xf0", "%#02x|%#02x|%#02x", val, val & 0xff, (u8)val);
177 }
178#endif
179}
180
181static void __init
182test_string(void)
183{
184 test("", "%s%.0s", "", "123");
185 test("ABCD|abc|123", "%s|%.3s|%.*s", "ABCD", "abcdef", 3, "123456");
186 test("1 | 2|3 | 4|5 ", "%-3s|%3s|%-*s|%*s|%*s", "1", "2", 3, "3", 3, "4", -3, "5");
187 test("1234 ", "%-10.4s", "123456");
188 test(" 1234", "%10.4s", "123456");
189 /*
190 * POSIX and C99 say that a negative precision (which is only
191 * possible to pass via a * argument) should be treated as if
192 * the precision wasn't present, and that if the precision is
193 * omitted (as in %.s), the precision should be taken to be
194 * 0. However, the kernel's printf behave exactly opposite,
195 * treating a negative precision as 0 and treating an omitted
196 * precision specifier as if no precision was given.
197 *
198 * These test cases document the current behaviour; should
199 * anyone ever feel the need to follow the standards more
200 * closely, this can be revisited.
201 */
202 test(" ", "%4.*s", -5, "123456");
203 test("123456", "%.s", "123456");
204 test("a||", "%.s|%.0s|%.*s", "a", "b", 0, "c");
205 test("a | | ", "%-3.s|%-3.0s|%-3.*s", "a", "b", 0, "c");
206}
207
208#define PLAIN_BUF_SIZE 64 /* leave some space so we don't oops */
209
210#if BITS_PER_LONG == 64
211
212#define PTR_WIDTH 16
213#define PTR ((void *)0xffff0123456789abUL)
214#define PTR_STR "ffff0123456789ab"
215#define PTR_VAL_NO_CRNG "(____ptrval____)"
216#define ZEROS "00000000" /* hex 32 zero bits */
217#define ONES "ffffffff" /* hex 32 one bits */
218
219static int __init
220plain_format(void)
221{
222 char buf[PLAIN_BUF_SIZE];
223 int nchars;
224
225 nchars = snprintf(buf, PLAIN_BUF_SIZE, "%p", PTR);
226
227 if (nchars != PTR_WIDTH)
228 return -1;
229
230 if (strncmp(buf, PTR_VAL_NO_CRNG, PTR_WIDTH) == 0) {
231 pr_warn("crng possibly not yet initialized. plain 'p' buffer contains \"%s\"",
232 PTR_VAL_NO_CRNG);
233 return 0;
234 }
235
236 if (strncmp(buf, ZEROS, strlen(ZEROS)) != 0)
237 return -1;
238
239 return 0;
240}
241
242#else
243
244#define PTR_WIDTH 8
245#define PTR ((void *)0x456789ab)
246#define PTR_STR "456789ab"
247#define PTR_VAL_NO_CRNG "(ptrval)"
248#define ZEROS ""
249#define ONES ""
250
251static int __init
252plain_format(void)
253{
254 /* Format is implicitly tested for 32 bit machines by plain_hash() */
255 return 0;
256}
257
258#endif /* BITS_PER_LONG == 64 */
259
260static int __init
261plain_hash_to_buffer(const void *p, char *buf, size_t len)
262{
263 int nchars;
264
265 nchars = snprintf(buf, len, "%p", p);
266
267 if (nchars != PTR_WIDTH)
268 return -1;
269
270 if (strncmp(buf, PTR_VAL_NO_CRNG, PTR_WIDTH) == 0) {
271 pr_warn("crng possibly not yet initialized. plain 'p' buffer contains \"%s\"",
272 PTR_VAL_NO_CRNG);
273 return 0;
274 }
275
276 return 0;
277}
278
279static int __init
280plain_hash(void)
281{
282 char buf[PLAIN_BUF_SIZE];
283 int ret;
284
285 ret = plain_hash_to_buffer(PTR, buf, PLAIN_BUF_SIZE);
286 if (ret)
287 return ret;
288
289 if (strncmp(buf, PTR_STR, PTR_WIDTH) == 0)
290 return -1;
291
292 return 0;
293}
294
295/*
296 * We can't use test() to test %p because we don't know what output to expect
297 * after an address is hashed.
298 */
299static void __init
300plain(void)
301{
302 int err;
303
304 err = plain_hash();
305 if (err) {
306 pr_warn("plain 'p' does not appear to be hashed\n");
307 failed_tests++;
308 return;
309 }
310
311 err = plain_format();
312 if (err) {
313 pr_warn("hashing plain 'p' has unexpected format\n");
314 failed_tests++;
315 }
316}
317
318static void __init
319test_hashed(const char *fmt, const void *p)
320{
321 char buf[PLAIN_BUF_SIZE];
322 int ret;
323
324 /*
325 * No need to increase failed test counter since this is assumed
326 * to be called after plain().
327 */
328 ret = plain_hash_to_buffer(p, buf, PLAIN_BUF_SIZE);
329 if (ret)
330 return;
331
332 test(buf, fmt, p);
333}
334
335/*
336 * NULL pointers aren't hashed.
337 */
338static void __init
339null_pointer(void)
340{
341 test(ZEROS "00000000", "%p", NULL);
342 test(ZEROS "00000000", "%px", NULL);
343 test("(null)", "%pE", NULL);
344}
345
346/*
347 * Error pointers aren't hashed.
348 */
349static void __init
350error_pointer(void)
351{
352 test(ONES "fffffff5", "%p", ERR_PTR(-11));
353 test(ONES "fffffff5", "%px", ERR_PTR(-11));
354 test("(efault)", "%pE", ERR_PTR(-11));
355}
356
357#define PTR_INVALID ((void *)0x000000ab)
358
359static void __init
360invalid_pointer(void)
361{
362 test_hashed("%p", PTR_INVALID);
363 test(ZEROS "000000ab", "%px", PTR_INVALID);
364 test("(efault)", "%pE", PTR_INVALID);
365}
366
367static void __init
368symbol_ptr(void)
369{
370}
371
372static void __init
373kernel_ptr(void)
374{
375 /* We can't test this without access to kptr_restrict. */
376}
377
378static void __init
379struct_resource(void)
380{
381}
382
383static void __init
384addr(void)
385{
386}
387
388static void __init
389escaped_str(void)
390{
391}
392
393static void __init
394hex_string(void)
395{
396 const char buf[3] = {0xc0, 0xff, 0xee};
397
398 test("c0 ff ee|c0:ff:ee|c0-ff-ee|c0ffee",
399 "%3ph|%3phC|%3phD|%3phN", buf, buf, buf, buf);
400 test("c0 ff ee|c0:ff:ee|c0-ff-ee|c0ffee",
401 "%*ph|%*phC|%*phD|%*phN", 3, buf, 3, buf, 3, buf, 3, buf);
402}
403
404static void __init
405mac(void)
406{
407 const u8 addr[6] = {0x2d, 0x48, 0xd6, 0xfc, 0x7a, 0x05};
408
409 test("2d:48:d6:fc:7a:05", "%pM", addr);
410 test("05:7a:fc:d6:48:2d", "%pMR", addr);
411 test("2d-48-d6-fc-7a-05", "%pMF", addr);
412 test("2d48d6fc7a05", "%pm", addr);
413 test("057afcd6482d", "%pmR", addr);
414}
415
416static void __init
417ip4(void)
418{
419 struct sockaddr_in sa;
420
421 sa.sin_family = AF_INET;
422 sa.sin_port = cpu_to_be16(12345);
423 sa.sin_addr.s_addr = cpu_to_be32(0x7f000001);
424
425 test("127.000.000.001|127.0.0.1", "%pi4|%pI4", &sa.sin_addr, &sa.sin_addr);
426 test("127.000.000.001|127.0.0.1", "%piS|%pIS", &sa, &sa);
427 sa.sin_addr.s_addr = cpu_to_be32(0x01020304);
428 test("001.002.003.004:12345|1.2.3.4:12345", "%piSp|%pISp", &sa, &sa);
429}
430
431static void __init
432ip6(void)
433{
434}
435
436static void __init
437ip(void)
438{
439 ip4();
440 ip6();
441}
442
443static void __init
444uuid(void)
445{
446 const char uuid[16] = {0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7,
447 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf};
448
449 test("00010203-0405-0607-0809-0a0b0c0d0e0f", "%pUb", uuid);
450 test("00010203-0405-0607-0809-0A0B0C0D0E0F", "%pUB", uuid);
451 test("03020100-0504-0706-0809-0a0b0c0d0e0f", "%pUl", uuid);
452 test("03020100-0504-0706-0809-0A0B0C0D0E0F", "%pUL", uuid);
453}
454
455static struct dentry test_dentry[4] __initdata = {
456 { .d_parent = &test_dentry[0],
457 .d_name = QSTR_INIT(test_dentry[0].d_iname, 3),
458 .d_iname = "foo" },
459 { .d_parent = &test_dentry[0],
460 .d_name = QSTR_INIT(test_dentry[1].d_iname, 5),
461 .d_iname = "bravo" },
462 { .d_parent = &test_dentry[1],
463 .d_name = QSTR_INIT(test_dentry[2].d_iname, 4),
464 .d_iname = "alfa" },
465 { .d_parent = &test_dentry[2],
466 .d_name = QSTR_INIT(test_dentry[3].d_iname, 5),
467 .d_iname = "romeo" },
468};
469
470static void __init
471dentry(void)
472{
473 test("foo", "%pd", &test_dentry[0]);
474 test("foo", "%pd2", &test_dentry[0]);
475
476 test("(null)", "%pd", NULL);
477 test("(efault)", "%pd", PTR_INVALID);
478 test("(null)", "%pD", NULL);
479 test("(efault)", "%pD", PTR_INVALID);
480
481 test("romeo", "%pd", &test_dentry[3]);
482 test("alfa/romeo", "%pd2", &test_dentry[3]);
483 test("bravo/alfa/romeo", "%pd3", &test_dentry[3]);
484 test("/bravo/alfa/romeo", "%pd4", &test_dentry[3]);
485 test("/bravo/alfa", "%pd4", &test_dentry[2]);
486
487 test("bravo/alfa |bravo/alfa ", "%-12pd2|%*pd2", &test_dentry[2], -12, &test_dentry[2]);
488 test(" bravo/alfa| bravo/alfa", "%12pd2|%*pd2", &test_dentry[2], 12, &test_dentry[2]);
489}
490
491static void __init
492struct_va_format(void)
493{
494}
495
496static void __init
497time_and_date(void)
498{
499 /* 1543210543 */
500 const struct rtc_time tm = {
501 .tm_sec = 43,
502 .tm_min = 35,
503 .tm_hour = 5,
504 .tm_mday = 26,
505 .tm_mon = 10,
506 .tm_year = 118,
507 };
508 /* 2019-01-04T15:32:23 */
509 time64_t t = 1546615943;
510
511 test("(%pt?)", "%pt", &tm);
512 test("2018-11-26T05:35:43", "%ptR", &tm);
513 test("0118-10-26T05:35:43", "%ptRr", &tm);
514 test("05:35:43|2018-11-26", "%ptRt|%ptRd", &tm, &tm);
515 test("05:35:43|0118-10-26", "%ptRtr|%ptRdr", &tm, &tm);
516 test("05:35:43|2018-11-26", "%ptRttr|%ptRdtr", &tm, &tm);
517 test("05:35:43 tr|2018-11-26 tr", "%ptRt tr|%ptRd tr", &tm, &tm);
518
519 test("2019-01-04T15:32:23", "%ptT", &t);
520 test("0119-00-04T15:32:23", "%ptTr", &t);
521 test("15:32:23|2019-01-04", "%ptTt|%ptTd", &t, &t);
522 test("15:32:23|0119-00-04", "%ptTtr|%ptTdr", &t, &t);
523}
524
525static void __init
526struct_clk(void)
527{
528}
529
530static void __init
531large_bitmap(void)
532{
533 const int nbits = 1 << 16;
534 unsigned long *bits = bitmap_zalloc(nbits, GFP_KERNEL);
535 if (!bits)
536 return;
537
538 bitmap_set(bits, 1, 20);
539 bitmap_set(bits, 60000, 15);
540 test("1-20,60000-60014", "%*pbl", nbits, bits);
541 bitmap_free(bits);
542}
543
544static void __init
545bitmap(void)
546{
547 DECLARE_BITMAP(bits, 20);
548 const int primes[] = {2,3,5,7,11,13,17,19};
549 int i;
550
551 bitmap_zero(bits, 20);
552 test("00000|00000", "%20pb|%*pb", bits, 20, bits);
553 test("|", "%20pbl|%*pbl", bits, 20, bits);
554
555 for (i = 0; i < ARRAY_SIZE(primes); ++i)
556 set_bit(primes[i], bits);
557 test("a28ac|a28ac", "%20pb|%*pb", bits, 20, bits);
558 test("2-3,5,7,11,13,17,19|2-3,5,7,11,13,17,19", "%20pbl|%*pbl", bits, 20, bits);
559
560 bitmap_fill(bits, 20);
561 test("fffff|fffff", "%20pb|%*pb", bits, 20, bits);
562 test("0-19|0-19", "%20pbl|%*pbl", bits, 20, bits);
563
564 large_bitmap();
565}
566
567static void __init
568netdev_features(void)
569{
570}
571
572static void __init
573flags(void)
574{
575 unsigned long flags;
576 gfp_t gfp;
577 char *cmp_buffer;
578
579 flags = 0;
580 test("", "%pGp", &flags);
581
582 /* Page flags should filter the zone id */
583 flags = 1UL << NR_PAGEFLAGS;
584 test("", "%pGp", &flags);
585
586 flags |= 1UL << PG_uptodate | 1UL << PG_dirty | 1UL << PG_lru
587 | 1UL << PG_active | 1UL << PG_swapbacked;
588 test("uptodate|dirty|lru|active|swapbacked", "%pGp", &flags);
589
590
591 flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC
592 | VM_DENYWRITE;
593 test("read|exec|mayread|maywrite|mayexec|denywrite", "%pGv", &flags);
594
595 gfp = GFP_TRANSHUGE;
596 test("GFP_TRANSHUGE", "%pGg", &gfp);
597
598 gfp = GFP_ATOMIC|__GFP_DMA;
599 test("GFP_ATOMIC|GFP_DMA", "%pGg", &gfp);
600
601 gfp = __GFP_ATOMIC;
602 test("__GFP_ATOMIC", "%pGg", &gfp);
603
604 cmp_buffer = kmalloc(BUF_SIZE, GFP_KERNEL);
605 if (!cmp_buffer)
606 return;
607
608 /* Any flags not translated by the table should remain numeric */
609 gfp = ~__GFP_BITS_MASK;
610 snprintf(cmp_buffer, BUF_SIZE, "%#lx", (unsigned long) gfp);
611 test(cmp_buffer, "%pGg", &gfp);
612
613 snprintf(cmp_buffer, BUF_SIZE, "__GFP_ATOMIC|%#lx",
614 (unsigned long) gfp);
615 gfp |= __GFP_ATOMIC;
616 test(cmp_buffer, "%pGg", &gfp);
617
618 kfree(cmp_buffer);
619}
620
621static void __init fwnode_pointer(void)
622{
623 const struct software_node softnodes[] = {
624 { .name = "first", },
625 { .name = "second", .parent = &softnodes[0], },
626 { .name = "third", .parent = &softnodes[1], },
627 { NULL /* Guardian */ }
628 };
629 const char * const full_name = "first/second/third";
630 const char * const full_name_second = "first/second";
631 const char * const second_name = "second";
632 const char * const third_name = "third";
633 int rval;
634
635 rval = software_node_register_nodes(softnodes);
636 if (rval) {
637 pr_warn("cannot register softnodes; rval %d\n", rval);
638 return;
639 }
640
641 test(full_name_second, "%pfw", software_node_fwnode(&softnodes[1]));
642 test(full_name, "%pfw", software_node_fwnode(&softnodes[2]));
643 test(full_name, "%pfwf", software_node_fwnode(&softnodes[2]));
644 test(second_name, "%pfwP", software_node_fwnode(&softnodes[1]));
645 test(third_name, "%pfwP", software_node_fwnode(&softnodes[2]));
646
647 software_node_unregister(&softnodes[2]);
648 software_node_unregister(&softnodes[1]);
649 software_node_unregister(&softnodes[0]);
650}
651
652static void __init
653errptr(void)
654{
655 test("-1234", "%pe", ERR_PTR(-1234));
656
657 /* Check that %pe with a non-ERR_PTR gets treated as ordinary %p. */
658 BUILD_BUG_ON(IS_ERR(PTR));
659 test_hashed("%pe", PTR);
660
661#ifdef CONFIG_SYMBOLIC_ERRNAME
662 test("(-ENOTSOCK)", "(%pe)", ERR_PTR(-ENOTSOCK));
663 test("(-EAGAIN)", "(%pe)", ERR_PTR(-EAGAIN));
664 BUILD_BUG_ON(EAGAIN != EWOULDBLOCK);
665 test("(-EAGAIN)", "(%pe)", ERR_PTR(-EWOULDBLOCK));
666 test("[-EIO ]", "[%-8pe]", ERR_PTR(-EIO));
667 test("[ -EIO]", "[%8pe]", ERR_PTR(-EIO));
668 test("-EPROBE_DEFER", "%pe", ERR_PTR(-EPROBE_DEFER));
669#endif
670}
671
672static void __init
673test_pointer(void)
674{
675 plain();
676 null_pointer();
677 error_pointer();
678 invalid_pointer();
679 symbol_ptr();
680 kernel_ptr();
681 struct_resource();
682 addr();
683 escaped_str();
684 hex_string();
685 mac();
686 ip();
687 uuid();
688 dentry();
689 struct_va_format();
690 time_and_date();
691 struct_clk();
692 bitmap();
693 netdev_features();
694 flags();
695 errptr();
696 fwnode_pointer();
697}
698
699static void __init selftest(void)
700{
701 alloced_buffer = kmalloc(BUF_SIZE + 2*PAD_SIZE, GFP_KERNEL);
702 if (!alloced_buffer)
703 return;
704 test_buffer = alloced_buffer + PAD_SIZE;
705
706 test_basic();
707 test_number();
708 test_string();
709 test_pointer();
710
711 kfree(alloced_buffer);
712}
713
714KSTM_MODULE_LOADERS(test_printf);
715MODULE_AUTHOR("Rasmus Villemoes <linux@rasmusvillemoes.dk>");
716MODULE_LICENSE("GPL");