-
-
Notifications
You must be signed in to change notification settings - Fork 277
/
stress-sem-sysv.c
626 lines (549 loc) · 15.5 KB
/
stress-sem-sysv.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
/*
* Copyright (C) 2013-2021 Canonical, Ltd.
* Copyright (C) 2022-2024 Colin Ian King.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "stress-ng.h"
#include "core-builtin.h"
#include "core-killpid.h"
#if defined(HAVE_SEM_SYSV)
#include <sys/sem.h>
#else
UNEXPECTED
#endif
#define MIN_SEM_SYSV_PROCS (2)
#define MAX_SEM_SYSV_PROCS (64)
#define DEFAULT_SEM_SYSV_PROCS (2)
#define STRESS_MAX_SEMS (100)
static const stress_help_t help[] = {
{ NULL, "sem-sysv N", "start N workers doing System V semaphore operations" },
{ NULL, "sem-sysv-ops N", "stop after N System V sem bogo operations" },
{ NULL, "sem-sysv-procs N", "number of processes to start per worker" },
{ NULL, "sem-sysv-setall", "exercise semctl SETALL (will alter the processes' semaphore set)"},
{ NULL, NULL, NULL }
};
#if defined(HAVE_SEM_SYSV) && \
defined(HAVE_KEY_T)
typedef union stress_semun {
int val; /* Value for SETVAL */
struct semid_ds *buf; /* Buffer for IPC_STAT, IPC_SET */ /* cppcheck-suppress unusedStructMember */
unsigned short *array; /* Array for GETALL, SETALL */ /* cppcheck-suppress unusedStructMember */
struct seminfo *__buf; /* Buffer for IPC_INFO (Linux-specific) */ /* cppcheck-suppress unusedStructMember */
} stress_semun_t;
#endif
static const stress_opt_t opts[] = {
{ OPT_sem_sysv_procs, "sem-sysv-procs", TYPE_ID_UINT64, MIN_SEM_SYSV_PROCS, MAX_SEM_SYSV_PROCS, NULL },
{ OPT_sem_sysv_setall, "sem-sysv-setall", TYPE_ID_BOOL, 0, 1, 0 },
END_OPT,
};
#if defined(HAVE_SEM_SYSV) && \
defined(HAVE_KEY_T)
/*
* stress_semaphore_sysv_init()
* initialise a System V semaphore
*/
static void stress_semaphore_sysv_init(const uint32_t num_instances)
{
int count = 0, sem_id;
(void)num_instances;
/* Exercise invalid nsems, EINVAL */
sem_id = semget((key_t)stress_mwc16(), -1, IPC_CREAT | S_IRUSR | S_IWUSR);
if (sem_id != -1)
(void)semctl(sem_id, 0, IPC_RMID);
/* Exercise invalid nsems, EINVAL */
sem_id = semget((key_t)stress_mwc16(), INT_MAX, IPC_CREAT | S_IRUSR | S_IWUSR);
if (sem_id != -1)
(void)semctl(sem_id, 0, IPC_RMID);
/* Exercise invalid semget semflg, EINVAL */
sem_id = semget((key_t)stress_mwc16(), 0, ~0);
if (sem_id != -1)
(void)semctl(sem_id, 0, IPC_RMID);
/* Exercise without IPC_CREAT, ENOENT */
sem_id = semget((key_t)stress_mwc16(), 1, S_IRUSR | S_IWUSR);
if (sem_id != -1)
(void)semctl(sem_id, 0, IPC_RMID);
while (count < 100) {
/* use odd key so it won't clash with even core-resource sem keys */
g_shared->sem_sysv.key_id = (key_t)stress_mwc16() | 1;
g_shared->sem_sysv.sem_id =
semget(g_shared->sem_sysv.key_id, 3,
IPC_CREAT | S_IRUSR | S_IWUSR);
if (g_shared->sem_sysv.sem_id >= 0)
break;
count++;
}
if (g_shared->sem_sysv.sem_id >= 0) {
stress_semun_t arg;
arg.val = 1;
if (semctl(g_shared->sem_sysv.sem_id, 0, SETVAL, arg) == 0) {
g_shared->sem_sysv.init = true;
return;
}
/* Clean up */
(void)semctl(g_shared->sem_sysv.sem_id, 0, IPC_RMID);
}
}
/*
* stress_semaphore_sysv_destory()
* destroy a System V semaphore
*/
static void stress_semaphore_sysv_deinit(void)
{
if (g_shared->sem_sysv.init)
(void)semctl(g_shared->sem_sysv.sem_id, 0, IPC_RMID);
}
#if defined(__linux__)
/*
* stress_semaphore_sysv_get_procinfo()
* exercise /proc/sysvipc/sem
*/
static void stress_semaphore_sysv_get_procinfo(bool *get_procinfo)
{
int fd;
fd = open("/proc/sysvipc/sem", O_RDONLY);
if (fd < 0) {
*get_procinfo = false;
return;
}
for (;;) {
ssize_t ret;
char buffer[1024];
ret = read(fd, buffer, sizeof(buffer));
if (ret <= 0)
break;
}
(void)close(fd);
}
#endif
/*
* stress_semaphore_sysv_thrash()
* exercise the semaphore
*/
static int OPTIMIZE3 stress_semaphore_sysv_thrash(
stress_args_t *args,
const bool semaphore_sysv_setall)
{
const int sem_id = g_shared->sem_sysv.sem_id;
int rc = EXIT_SUCCESS;
#if defined(HAVE_SEMTIMEDOP)
bool got_semtimedop = true;
#endif
do {
int i, ret;
#if defined(__linux__)
bool get_procinfo = true;
#endif
#if defined(__linux__)
/* periodically get proc info */
if (get_procinfo) {
static uint8_t procinfo_count = 0;
if (procinfo_count++ == 0)
stress_semaphore_sysv_get_procinfo(&get_procinfo);
}
#endif
#if defined(HAVE_SEMTIMEDOP)
if (got_semtimedop) {
struct timespec timeout ALIGN64;
struct sembuf sems[STRESS_MAX_SEMS * 3] ALIGN64;
for (i = 0; i < STRESS_MAX_SEMS * 3; i += 3) {
sems[i].sem_num = 1;
sems[i].sem_op = 1;
sems[i].sem_flg = SEM_UNDO;
sems[i + 1].sem_num = 1;
sems[i + 1].sem_op = 1;
sems[i + 1].sem_flg = SEM_UNDO;
sems[i + 2].sem_num = 1;
sems[i + 2].sem_op = -1;
sems[i + 2].sem_flg = SEM_UNDO;
}
timeout.tv_sec = 0;
timeout.tv_nsec = 100000;
VOID_RET(int, semtimedop(sem_id, sems, STRESS_MAX_SEMS * 3, &timeout));
}
#else
UNEXPECTED
#endif
for (i = 0; i < 1000; i++) {
struct sembuf semwait, semsignal;
semwait.sem_num = 0;
semwait.sem_op = -1;
semwait.sem_flg = SEM_UNDO;
semsignal.sem_num = 0;
semsignal.sem_op = 1;
semsignal.sem_flg = SEM_UNDO;
#if defined(HAVE_SEMTIMEDOP)
if (got_semtimedop) {
struct timespec timeout ALIGN64;
timeout.tv_sec = 1;
timeout.tv_nsec = 0;
ret = semtimedop(sem_id, &semwait, 1, &timeout);
if ((ret < 0) && ((errno == ENOSYS) || (errno == EINVAL))) {
got_semtimedop = false;
ret = semop(sem_id, &semwait, 1);
}
} else {
ret = semop(sem_id, &semwait, 1);
}
#else
ret = semop(sem_id, &semwait, 1);
#endif
if (UNLIKELY(ret < 0)) {
if (errno == EAGAIN)
goto timed_out;
if (errno != EINTR) {
pr_fail("%s: semop wait failed, errno=%d (%s)\n",
args->name, errno, strerror(errno));
rc = EXIT_FAILURE;
}
break;
}
if (UNLIKELY(semop(sem_id, &semsignal, 1) < 0)) {
if (errno != EINTR) {
pr_fail("%s: semop signal failed, errno=%d (%s)\n",
args->name, errno, strerror(errno));
rc = EXIT_FAILURE;
}
break;
}
timed_out:
stress_bogo_inc(args);
if (UNLIKELY(!stress_continue(args)))
break;
}
#if defined(IPC_STAT)
{
struct semid_ds ds;
stress_semun_t s;
#if defined(GETALL)
size_t nsems;
#endif
(void)shim_memset(&ds, 0, sizeof(ds));
s.buf = &ds;
if (UNLIKELY(semctl(sem_id, 2, IPC_STAT, &s) < 0)) {
pr_fail("%s: semctl IPC_STAT failed, errno=%d (%s)\n",
args->name, errno, strerror(errno));
rc = EXIT_FAILURE;
} else {
#if defined(IPC_SET)
s.buf = &ds;
VOID_RET(int, semctl(sem_id, 2, IPC_SET, &s));
#else
UNEXPECTED
#endif
}
#if defined(GETALL)
/* Avoid zero array size allocation */
nsems = ds.sem_nsems;
if (nsems < 64)
nsems = 64;
s.array = calloc(nsems, sizeof(*s.array));
if (s.array) {
VOID_RET(int, semctl(sem_id, 2, GETALL, s));
#if defined(SETALL)
/*
* SETALL across the semaphores will clobber the state
* and cause waits on semaphores because of the unlocked
* state change. Currently this is disabled.
*/
if ((ret == 0) && (semaphore_sysv_setall))
ret = semctl(sem_id, 2, SETALL, s);
#endif
free(s.array);
}
#endif
}
#else
UNEXPECTED
#endif
#if defined(SEM_STAT) && \
defined(__linux__)
{
struct semid_ds ds;
stress_semun_t s;
/* Exercise with a 0 index into kernel array */
s.buf = &ds;
VOID_RET(int, semctl(0, 0, SEM_STAT, &s));
/* Exercise with a probably illegal index into kernel array */
s.buf = &ds;
VOID_RET(int, semctl(0x1fffffff, 0, SEM_STAT, &s));
}
#endif
#if defined(SEM_STAT_ANY) && \
defined(__linux__)
{
struct seminfo si;
stress_semun_t s;
/* Exercise with a 0 index into kernel array */
s.__buf = &si;
VOID_RET(int, semctl(0, 0, SEM_STAT_ANY, &s));
/* Exercise with a probably illegal index into kernel array */
s.__buf = &si;
VOID_RET(int, semctl(0x1fffffff, 0, SEM_STAT_ANY, &s));
}
#endif
#if defined(IPC_INFO) && \
defined(__linux__)
{
struct seminfo si;
stress_semun_t s;
s.__buf = &si;
if (UNLIKELY(semctl(sem_id, 0, IPC_INFO, &s) < 0)) {
pr_fail("%s: semctl IPC_INFO failed, errno=%d (%s)\n",
args->name, errno, strerror(errno));
rc = EXIT_FAILURE;
}
/*
* Exercise with probably an illegal sem id, this arg is
* actually ignored, so should be OK
*/
s.__buf = &si;
VOID_RET(int, semctl(0x1fffffff, 0, IPC_INFO, &s));
/*
* Exercise with an illegal sem number, this arg is
* also ignored, so should be OK
*/
s.__buf = &si;
VOID_RET(int, semctl(sem_id, ~0, IPC_INFO, &s));
}
#endif
#if defined(SEM_INFO) && \
defined(__linux__)
{
struct seminfo si;
stress_semun_t s;
s.__buf = &si;
if (UNLIKELY(semctl(sem_id, 0, SEM_INFO, &s) < 0)) {
pr_fail("%s: semctl SEM_INFO failed, errno=%d (%s)\n",
args->name, errno, strerror(errno));
rc = EXIT_FAILURE;
}
/* Exercise with probably an illegal sem id */
s.__buf = &si;
VOID_RET(int, semctl(0x1fffffff, 0, IPC_INFO, &s));
/* Exercise with an illegal sem number */
s.__buf = &si;
VOID_RET(int, semctl(sem_id, ~0, IPC_INFO, &s));
}
#endif
if (UNLIKELY(!stress_continue(args)))
break;
#if defined(GETVAL)
VOID_RET(int, semctl(sem_id, 0, GETVAL, 0));
/* Exercise with probably an illegal sem id */
VOID_RET(int, semctl(0x1fffffff, 0, GETVAL, 0));
/* Exercise with an illegal sem number */
VOID_RET(int, semctl(sem_id, ~0, GETVAL, 0));
#else
UNEXPECTED
#endif
#if defined(GETPID)
VOID_RET(int, semctl(sem_id, 0, GETPID, 0));
/* Exercise with probably an illegal sem id */
VOID_RET(int, semctl(0x1fffffff, 0, GETPID, 0));
/* Exercise with an illegal sem number */
VOID_RET(int, semctl(sem_id, ~0, GETPID, 0));
#else
UNEXPECTED
#endif
#if defined(GETNCNT)
VOID_RET(int, semctl(sem_id, 0, GETNCNT, 0));
/* Exercise with probably an illegal sem id */
VOID_RET(int, semctl(0x1fffffff, 0, GETNCNT, 0));
/* Exercise with an illegal sem number */
VOID_RET(int, semctl(sem_id, ~0, GETNCNT, 0));
#else
UNEXPECTED
#endif
#if defined(GETZCNT)
VOID_RET(int, semctl(sem_id, 0, GETZCNT, 0));
/* Exercise with probably an illegal sem id */
VOID_RET(int, semctl(0x1fffffff, 0, GETZCNT, 0));
/* Exercise with an illegal sem number */
VOID_RET(int, semctl(sem_id, ~0, GETZCNT, 0));
#else
UNEXPECTED
#endif
/*
* Now exercise invalid options and arguments
*/
VOID_RET(int, semctl(sem_id, -1, SETVAL, 0));
#if defined(HAVE_SEMTIMEDOP)
if (got_semtimedop) {
/*
* Exercise illegal timeout
*/
struct sembuf semwait;
struct timespec timeout;
timeout.tv_sec = -1;
timeout.tv_nsec = -1;
semwait.sem_num = 0;
semwait.sem_op = -1;
semwait.sem_flg = SEM_UNDO;
VOID_RET(int, semtimedop(sem_id, &semwait, 1, &timeout));
/*
* Exercise invalid semid, EINVAL
*/
timeout.tv_sec = 0;
timeout.tv_nsec = 10000;
VOID_RET(int, semtimedop(-1, &semwait, 1, &timeout));
/*
* Exercise invalid nsops, E2BIG
*/
timeout.tv_sec = 0;
timeout.tv_nsec = 10000;
VOID_RET(int, semtimedop(sem_id, &semwait, (size_t)-1, &timeout));
if (UNLIKELY(!stress_continue(args)))
break;
}
#else
UNEXPECTED
#endif
{
struct sembuf semwait;
/*
* Exercise invalid semid, EINVAL
*/
VOID_RET(int, semop(-1, &semwait, 1));
/*
* Exercise invalid nsops, E2BIG
*/
#if defined(__DragonFly__)
VOID_RET(int, semop(sem_id, &semwait, (unsigned int)-1));
#else
VOID_RET(int, semop(sem_id, &semwait, (size_t)-1));
#endif
}
/*
* Exercise illegal semwait
*/
{
struct sembuf semwait;
semwait.sem_num = (unsigned short)-1;
semwait.sem_op = -1;
semwait.sem_flg = SEM_UNDO;
VOID_RET(int, semop(sem_id, &semwait, 1));
}
/*
* Exercise illegal cmd, use direct system call
* if available as some libcs detect that the cmd
* is invalid without doing the actual system call
*/
(void)semctl(sem_id, 0, INT_MAX, 0);
#if defined(__NR_semctl) && \
defined(HAVE_SYSCALL)
(void)syscall(__NR_semctl, sem_id, 0, INT_MAX, 0);
#endif
} while ((rc == EXIT_SUCCESS) && stress_continue(args));
return rc;
}
/*
* semaphore_sysv_spawn()
* spawn a process
*/
static pid_t semaphore_sysv_spawn(
stress_args_t *args,
stress_pid_t **s_pids_head,
stress_pid_t *s_pid,
const bool semaphore_sysv_setall)
{
again:
s_pid->pid = fork();
if (s_pid->pid < 0) {
if (stress_redo_fork(args, errno))
goto again;
return -1;
} else if (s_pid->pid == 0) {
s_pid->pid = getpid();
stress_sync_start_wait_s_pid(s_pid);
stress_parent_died_alarm();
(void)sched_settings_apply(true);
_exit(stress_semaphore_sysv_thrash(args, semaphore_sysv_setall));
} else {
stress_sync_start_s_pid_list_add(s_pids_head, s_pid);
}
return s_pid->pid;
}
/*
* stress_sem_sysv()
* stress system by sem ops
*/
static int stress_sem_sysv(stress_args_t *args)
{
stress_pid_t *s_pids, *s_pids_head = NULL;
uint64_t i;
uint64_t semaphore_sysv_procs = DEFAULT_SEM_SYSV_PROCS;
int rc = EXIT_SUCCESS;
bool semaphore_sysv_setall = false;
if (stress_sigchld_set_handler(args) < 0)
return EXIT_NO_RESOURCE;
if (!g_shared->sem_sysv.init) {
pr_inf_skip("%s: skipping stressor, semaphore not initialised\n", args->name);
return EXIT_NO_RESOURCE;
}
if (!stress_get_setting("sem-sysv-procs", &semaphore_sysv_procs)) {
if (g_opt_flags & OPT_FLAGS_MAXIMIZE)
semaphore_sysv_procs = MAX_SEM_SYSV_PROCS;
if (g_opt_flags & OPT_FLAGS_MINIMIZE)
semaphore_sysv_procs = MIN_SEM_SYSV_PROCS;
}
(void)stress_get_setting("sem-sysv-setall", &semaphore_sysv_setall);
if (stress_sighandler(args->name, SIGCHLD, stress_sighandler_nop, NULL) < 0)
return EXIT_NO_RESOURCE;
s_pids = stress_s_pids_mmap(MAX_SEM_SYSV_PROCS);
if (s_pids == MAP_FAILED) {
pr_inf_skip("%s: failed to mmap %d PIDs, skipping stressor\n", args->name, MAX_SEM_SYSV_PROCS);
return EXIT_NO_RESOURCE;
}
for (i = 0; i < semaphore_sysv_procs; i++) {
stress_sync_start_init(&s_pids[i]);
if (semaphore_sysv_spawn(args, &s_pids_head, &s_pids[i], semaphore_sysv_setall) < 0)
goto reap;
if (!stress_continue_flag())
goto reap;
}
stress_set_proc_state(args->name, STRESS_STATE_SYNC_WAIT);
stress_sync_start_wait(args);
stress_sync_start_cont_list(s_pids_head);
stress_set_proc_state(args->name, STRESS_STATE_RUN);
/* Wait for termination */
while (stress_continue(args))
pause();
reap:
stress_set_proc_state(args->name, STRESS_STATE_DEINIT);
stress_kill_and_wait_many(args, s_pids, semaphore_sysv_procs, SIGALRM, true);
stress_s_pids_munmap(s_pids, MAX_SEM_SYSV_PROCS);
return rc;
}
const stressor_info_t stress_sem_sysv_info = {
.stressor = stress_sem_sysv,
.init = stress_semaphore_sysv_init,
.deinit = stress_semaphore_sysv_deinit,
.class = CLASS_OS | CLASS_SCHEDULER | CLASS_IPC,
.opts = opts,
.verify = VERIFY_ALWAYS,
.help = help
};
#else
const stressor_info_t stress_sem_sysv_info = {
.stressor = stress_unimplemented,
.class = CLASS_OS | CLASS_SCHEDULER | CLASS_IPC,
.opts = opts,
.verify = VERIFY_ALWAYS,
.help = help,
.unimplemented_reason = "built without sys/sem.h"
};
#endif