summaryrefslogtreecommitdiff
path: root/nptl/nptl-init.c
blob: bdbdfedcef956bca51b9473674381d36eac2c751 (plain)
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
/* Copyright (C) 2002-2016 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/param.h>
#include <sys/resource.h>
#include <pthreadP.h>
#include <atomic.h>
#include <ldsodefs.h>
#include <tls.h>
#include <list.h>
#include <fork.h>
#include <version.h>
#include <shlib-compat.h>
#include <smp.h>
#include <lowlevellock.h>
#include <futex-internal.h>
#include <kernel-features.h>
#include <libc-internal.h>
#include <pthread-pids.h>

#ifndef TLS_MULTIPLE_THREADS_IN_TCB
/* Pointer to the corresponding variable in libc.  */
int *__libc_multiple_threads_ptr attribute_hidden;
#endif

/* Size and alignment of static TLS block.  */
size_t __static_tls_size;
size_t __static_tls_align_m1;

#ifndef __ASSUME_SET_ROBUST_LIST
/* Negative if we do not have the system call and we can use it.  */
int __set_robust_list_avail;
# define set_robust_list_not_avail() \
  __set_robust_list_avail = -1
#else
# define set_robust_list_not_avail() do { } while (0)
#endif

#ifndef __ASSUME_FUTEX_CLOCK_REALTIME
/* Nonzero if we do not have FUTEX_CLOCK_REALTIME.  */
int __have_futex_clock_realtime;
# define __set_futex_clock_realtime() \
  __have_futex_clock_realtime = 1
#else
#define __set_futex_clock_realtime() do { } while (0)
#endif

/* Version of the library, used in libthread_db to detect mismatches.  */
static const char nptl_version[] __attribute_used__ = VERSION;


#ifndef SHARED
extern void __libc_setup_tls (size_t tcbsize, size_t tcbalign);
#endif

#ifdef SHARED
static
#else
extern
#endif
void __nptl_set_robust (struct pthread *);

#ifdef SHARED
static void nptl_freeres (void);


static const struct pthread_functions pthread_functions =
  {
    .ptr_pthread_attr_destroy = __pthread_attr_destroy,
# if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_1)
    .ptr___pthread_attr_init_2_0 = __pthread_attr_init_2_0,
# endif
    .ptr___pthread_attr_init_2_1 = __pthread_attr_init_2_1,
    .ptr_pthread_attr_getdetachstate = __pthread_attr_getdetachstate,
    .ptr_pthread_attr_setdetachstate = __pthread_attr_setdetachstate,
    .ptr_pthread_attr_getinheritsched = __pthread_attr_getinheritsched,
    .ptr_pthread_attr_setinheritsched = __pthread_attr_setinheritsched,
    .ptr_pthread_attr_getschedparam = __pthread_attr_getschedparam,
    .ptr_pthread_attr_setschedparam = __pthread_attr_setschedparam,
    .ptr_pthread_attr_getschedpolicy = __pthread_attr_getschedpolicy,
    .ptr_pthread_attr_setschedpolicy = __pthread_attr_setschedpolicy,
    .ptr_pthread_attr_getscope = __pthread_attr_getscope,
    .ptr_pthread_attr_setscope = __pthread_attr_setscope,
    .ptr_pthread_condattr_destroy = __pthread_condattr_destroy,
    .ptr_pthread_condattr_init = __pthread_condattr_init,
    .ptr___pthread_cond_broadcast = __pthread_cond_broadcast,
    .ptr___pthread_cond_destroy = __pthread_cond_destroy,
    .ptr___pthread_cond_init = __pthread_cond_init,
    .ptr___pthread_cond_signal = __pthread_cond_signal,
    .ptr___pthread_cond_wait = __pthread_cond_wait,
    .ptr___pthread_cond_timedwait = __pthread_cond_timedwait,
# if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_3_2)
    .ptr___pthread_cond_broadcast_2_0 = __pthread_cond_broadcast_2_0,
    .ptr___pthread_cond_destroy_2_0 = __pthread_cond_destroy_2_0,
    .ptr___pthread_cond_init_2_0 = __pthread_cond_init_2_0,
    .ptr___pthread_cond_signal_2_0 = __pthread_cond_signal_2_0,
    .ptr___pthread_cond_wait_2_0 = __pthread_cond_wait_2_0,
    .ptr___pthread_cond_timedwait_2_0 = __pthread_cond_timedwait_2_0,
# endif
    .ptr_pthread_equal = __pthread_equal,
    .ptr___pthread_exit = __pthread_exit,
    .ptr_pthread_getschedparam = __pthread_getschedparam,
    .ptr_pthread_setschedparam = __pthread_setschedparam,
    .ptr_pthread_mutex_destroy = __pthread_mutex_destroy,
    .ptr_pthread_mutex_init = __pthread_mutex_init,
    .ptr_pthread_mutex_lock = __pthread_mutex_lock,
    .ptr_pthread_mutex_unlock = __pthread_mutex_unlock,
    .ptr_pthread_self = __pthread_self,
    .ptr___pthread_setcancelstate = __pthread_setcancelstate,
    .ptr_pthread_setcanceltype = __pthread_setcanceltype,
    .ptr___pthread_cleanup_upto = __pthread_cleanup_upto,
    .ptr___pthread_once = __pthread_once,
    .ptr___pthread_rwlock_rdlock = __pthread_rwlock_rdlock,
    .ptr___pthread_rwlock_wrlock = __pthread_rwlock_wrlock,
    .ptr___pthread_rwlock_unlock = __pthread_rwlock_unlock,
    .ptr___pthread_key_create = __pthread_key_create,
    .ptr___pthread_getspecific = __pthread_getspecific,
    .ptr___pthread_setspecific = __pthread_setspecific,
    .ptr__pthread_cleanup_push_defer = __pthread_cleanup_push_defer,
    .ptr__pthread_cleanup_pop_restore = __pthread_cleanup_pop_restore,
    .ptr_nthreads = &__nptl_nthreads,
    .ptr___pthread_unwind = &__pthread_unwind,
    .ptr__nptl_deallocate_tsd = __nptl_deallocate_tsd,
# ifdef SIGSETXID
    .ptr__nptl_setxid = __nptl_setxid,
# endif
    /* For now only the stack cache needs to be freed.  */
    .ptr_freeres = nptl_freeres,
    .ptr_set_robust = __nptl_set_robust
  };
# define ptr_pthread_functions &pthread_functions
#else
# define ptr_pthread_functions NULL
#endif


#ifdef SHARED
/* This function is called indirectly from the freeres code in libc.  */
static void
__libc_freeres_fn_section
nptl_freeres (void)
{
  __unwind_freeres ();
  __free_stacks (0);
}


static
#endif
void
__nptl_set_robust (struct pthread *self)
{
#ifdef __NR_set_robust_list
  INTERNAL_SYSCALL_DECL (err);
  INTERNAL_SYSCALL (set_robust_list, err, 2, &self->robust_head,
		    sizeof (struct robust_list_head));
#endif
}


#ifdef SIGCANCEL
/* For asynchronous cancellation we use a signal.  This is the handler.  */
static void
sigcancel_handler (int sig, siginfo_t *si, void *ctx)
{
  /* Determine the process ID.  It might be negative if the thread is
     in the middle of a fork() call.  */
  pid_t pid = THREAD_GETMEM (THREAD_SELF, pid);
  if (__glibc_unlikely (pid < 0))
    pid = -pid;

  /* Safety check.  It would be possible to call this function for
     other signals and send a signal from another process.  This is not
     correct and might even be a security problem.  Try to catch as
     many incorrect invocations as possible.  */
  if (sig != SIGCANCEL
      || si->si_pid != pid
      || si->si_code != SI_TKILL)
    return;

  struct pthread *self = THREAD_SELF;

  int oldval = THREAD_GETMEM (self, cancelhandling);
  while (1)
    {
      /* We are canceled now.  When canceled by another thread this flag
	 is already set but if the signal is directly send (internally or
	 from another process) is has to be done here.  */
      int newval = oldval | CANCELING_BITMASK | CANCELED_BITMASK;

      if (oldval == newval || (oldval & EXITING_BITMASK) != 0)
	/* Already canceled or exiting.  */
	break;

      int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling, newval,
					      oldval);
      if (curval == oldval)
	{
	  /* Set the return value.  */
	  THREAD_SETMEM (self, result, PTHREAD_CANCELED);

	  /* Make sure asynchronous cancellation is still enabled.  */
	  if ((newval & CANCELTYPE_BITMASK) != 0)
	    /* Run the registered destructors and terminate the thread.  */
	    __do_cancel ();

	  break;
	}

      oldval = curval;
    }
}
#endif


#ifdef SIGSETXID
struct xid_command *__xidcmd attribute_hidden;

/* We use the SIGSETXID signal in the setuid, setgid, etc. implementations to
   tell each thread to call the respective setxid syscall on itself.  This is
   the handler.  */
static void
sighandler_setxid (int sig, siginfo_t *si, void *ctx)
{
  /* Determine the process ID.  It might be negative if the thread is
     in the middle of a fork() call.  */
  pid_t pid = THREAD_GETMEM (THREAD_SELF, pid);
  int result;
  if (__glibc_unlikely (pid < 0))
    pid = -pid;

  /* Safety check.  It would be possible to call this function for
     other signals and send a signal from another process.  This is not
     correct and might even be a security problem.  Try to catch as
     many incorrect invocations as possible.  */
  if (sig != SIGSETXID
      || si->si_pid != pid
      || si->si_code != SI_TKILL)
    return;

  INTERNAL_SYSCALL_DECL (err);
  result = INTERNAL_SYSCALL_NCS (__xidcmd->syscall_no, err, 3, __xidcmd->id[0],
				 __xidcmd->id[1], __xidcmd->id[2]);
  int error = 0;
  if (__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (result, err)))
    error = INTERNAL_SYSCALL_ERRNO (result, err);
  __nptl_setxid_error (__xidcmd, error);

  /* Reset the SETXID flag.  */
  struct pthread *self = THREAD_SELF;
  int flags, newval;
  do
    {
      flags = THREAD_GETMEM (self, cancelhandling);
      newval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling,
					  flags & ~SETXID_BITMASK, flags);
    }
  while (flags != newval);

  /* And release the futex.  */
  self->setxid_futex = 1;
  futex_wake (&self->setxid_futex, 1, FUTEX_PRIVATE);

  if (atomic_decrement_val (&__xidcmd->cntr) == 0)
    futex_wake ((unsigned int *) &__xidcmd->cntr, 1, FUTEX_PRIVATE);
}
#endif


/* When using __thread for this, we do it in libc so as not
   to give libpthread its own TLS segment just for this.  */
extern void **__libc_dl_error_tsd (void) __attribute__ ((const));


/* This can be set by the debugger before initialization is complete.  */
static bool __nptl_initial_report_events __attribute_used__;

void
__pthread_initialize_minimal_internal (void)
{
#ifndef SHARED
  /* Unlike in the dynamically linked case the dynamic linker has not
     taken care of initializing the TLS data structures.  */
  __libc_setup_tls (TLS_TCB_SIZE, TLS_TCB_ALIGN);

  /* We must prevent gcc from being clever and move any of the
     following code ahead of the __libc_setup_tls call.  This function
     will initialize the thread register which is subsequently
     used.  */
  __asm __volatile ("");
#endif

  /* Minimal initialization of the thread descriptor.  */
  struct pthread *pd = THREAD_SELF;
  __pthread_initialize_pids (pd);
  THREAD_SETMEM (pd, specific[0], &pd->specific_1stblock[0]);
  THREAD_SETMEM (pd, user_stack, true);
  if (LLL_LOCK_INITIALIZER != 0)
    THREAD_SETMEM (pd, lock, LLL_LOCK_INITIALIZER);
#if HP_TIMING_AVAIL
  THREAD_SETMEM (pd, cpuclock_offset, GL(dl_cpuclock_offset));
#endif

  /* Initialize the robust mutex data.  */
  {
#ifdef __PTHREAD_MUTEX_HAVE_PREV
    pd->robust_prev = &pd->robust_head;
#endif
    pd->robust_head.list = &pd->robust_head;
#ifdef __NR_set_robust_list
    pd->robust_head.futex_offset = (offsetof (pthread_mutex_t, __data.__lock)
				    - offsetof (pthread_mutex_t,
						__data.__list.__next));
    INTERNAL_SYSCALL_DECL (err);
    int res = INTERNAL_SYSCALL (set_robust_list, err, 2, &pd->robust_head,
				sizeof (struct robust_list_head));
    if (INTERNAL_SYSCALL_ERROR_P (res, err))
#endif
      set_robust_list_not_avail ();
  }

#ifdef __NR_futex
# ifndef __ASSUME_PRIVATE_FUTEX
  /* Private futexes are always used (at least internally) so that
     doing the test once this early is beneficial.  */
  {
    int word = 0;
    INTERNAL_SYSCALL_DECL (err);
    word = INTERNAL_SYSCALL (futex, err, 3, &word,
			    FUTEX_WAKE | FUTEX_PRIVATE_FLAG, 1);
    if (!INTERNAL_SYSCALL_ERROR_P (word, err))
      THREAD_SETMEM (pd, header.private_futex, FUTEX_PRIVATE_FLAG);
  }

  /* Private futexes have been introduced earlier than the
     FUTEX_CLOCK_REALTIME flag.  We don't have to run the test if we
     know the former are not supported.  This also means we know the
     kernel will return ENOSYS for unknown operations.  */
  if (THREAD_GETMEM (pd, header.private_futex) != 0)
# endif
# ifndef __ASSUME_FUTEX_CLOCK_REALTIME
    {
      int word = 0;
      /* NB: the syscall actually takes six parameters.  The last is the
	 bit mask.  But since we will not actually wait at all the value
	 is irrelevant.  Given that passing six parameters is difficult
	 on some architectures we just pass whatever random value the
	 calling convention calls for to the kernel.  It causes no harm.  */
      INTERNAL_SYSCALL_DECL (err);
      word = INTERNAL_SYSCALL (futex, err, 5, &word,
			       FUTEX_WAIT_BITSET | FUTEX_CLOCK_REALTIME
			       | FUTEX_PRIVATE_FLAG, 1, NULL, 0);
      assert (INTERNAL_SYSCALL_ERROR_P (word, err));
      if (INTERNAL_SYSCALL_ERRNO (word, err) != ENOSYS)
	__set_futex_clock_realtime ();
    }
# endif
#endif

  /* Set initial thread's stack block from 0 up to __libc_stack_end.
     It will be bigger than it actually is, but for unwind.c/pt-longjmp.c
     purposes this is good enough.  */
  THREAD_SETMEM (pd, stackblock_size, (size_t) __libc_stack_end);

  /* Initialize the list of all running threads with the main thread.  */
  INIT_LIST_HEAD (&__stack_user);
  list_add (&pd->list, &__stack_user);

  /* Before initializing __stack_user, the debugger could not find us and
     had to set __nptl_initial_report_events.  Propagate its setting.  */
  THREAD_SETMEM (pd, report_events, __nptl_initial_report_events);

#if defined SIGCANCEL || defined SIGSETXID
  struct sigaction sa;
  __sigemptyset (&sa.sa_mask);

# ifdef SIGCANCEL
  /* Install the cancellation signal handler.  If for some reason we
     cannot install the handler we do not abort.  Maybe we should, but
     it is only asynchronous cancellation which is affected.  */
  sa.sa_sigaction = sigcancel_handler;
  sa.sa_flags = SA_SIGINFO;
  (void) __libc_sigaction (SIGCANCEL, &sa, NULL);
# endif

# ifdef SIGSETXID
  /* Install the handle to change the threads' uid/gid.  */
  sa.sa_sigaction = sighandler_setxid;
  sa.sa_flags = SA_SIGINFO | SA_RESTART;
  (void) __libc_sigaction (SIGSETXID, &sa, NULL);
# endif

  /* The parent process might have left the signals blocked.  Just in
     case, unblock it.  We reuse the signal mask in the sigaction
     structure.  It is already cleared.  */
# ifdef SIGCANCEL
  __sigaddset (&sa.sa_mask, SIGCANCEL);
# endif
# ifdef SIGSETXID
  __sigaddset (&sa.sa_mask, SIGSETXID);
# endif
  {
    INTERNAL_SYSCALL_DECL (err);
    (void) INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_UNBLOCK, &sa.sa_mask,
			     NULL, _NSIG / 8);
  }
#endif

  /* Get the size of the static and alignment requirements for the TLS
     block.  */
  size_t static_tls_align;
  _dl_get_tls_static_info (&__static_tls_size, &static_tls_align);

  /* Make sure the size takes all the alignments into account.  */
  if (STACK_ALIGN > static_tls_align)
    static_tls_align = STACK_ALIGN;
  __static_tls_align_m1 = static_tls_align - 1;

  __static_tls_size = roundup (__static_tls_size, static_tls_align);

  /* Determine the default allowed stack size.  This is the size used
     in case the user does not specify one.  */
  struct rlimit limit;
  if (__getrlimit (RLIMIT_STACK, &limit) != 0
      || limit.rlim_cur == RLIM_INFINITY)
    /* The system limit is not usable.  Use an architecture-specific
       default.  */
    limit.rlim_cur = ARCH_STACK_DEFAULT_SIZE;
  else if (limit.rlim_cur < PTHREAD_STACK_MIN)
    /* The system limit is unusably small.
       Use the minimal size acceptable.  */
    limit.rlim_cur = PTHREAD_STACK_MIN;

  /* Make sure it meets the minimum size that allocate_stack
     (allocatestack.c) will demand, which depends on the page size.  */
  const uintptr_t pagesz = GLRO(dl_pagesize);
  const size_t minstack = pagesz + __static_tls_size + MINIMAL_REST_STACK;
  if (limit.rlim_cur < minstack)
    limit.rlim_cur = minstack;

  /* Round the resource limit up to page size.  */
  limit.rlim_cur = ALIGN_UP (limit.rlim_cur, pagesz);
  lll_lock (__default_pthread_attr_lock, LLL_PRIVATE);
  __default_pthread_attr.stacksize = limit.rlim_cur;
  __default_pthread_attr.guardsize = GLRO (dl_pagesize);
  lll_unlock (__default_pthread_attr_lock, LLL_PRIVATE);

#ifdef SHARED
  /* Transfer the old value from the dynamic linker's internal location.  */
  *__libc_dl_error_tsd () = *(*GL(dl_error_catch_tsd)) ();
  GL(dl_error_catch_tsd) = &__libc_dl_error_tsd;

  /* Make __rtld_lock_{,un}lock_recursive use pthread_mutex_{,un}lock,
     keep the lock count from the ld.so implementation.  */
  GL(dl_rtld_lock_recursive) = (void *) __pthread_mutex_lock;
  GL(dl_rtld_unlock_recursive) = (void *) __pthread_mutex_unlock;
  unsigned int rtld_lock_count = GL(dl_load_lock).mutex.__data.__count;
  GL(dl_load_lock).mutex.__data.__count = 0;
  while (rtld_lock_count-- > 0)
    __pthread_mutex_lock (&GL(dl_load_lock).mutex);

  GL(dl_make_stack_executable_hook) = &__make_stacks_executable;
#endif

  GL(dl_init_static_tls) = &__pthread_init_static_tls;

  GL(dl_wait_lookup_done) = &__wait_lookup_done;

  /* Register the fork generation counter with the libc.  */
#ifndef TLS_MULTIPLE_THREADS_IN_TCB
  __libc_multiple_threads_ptr =
#endif
    __libc_pthread_init (&__fork_generation, __reclaim_stacks,
			 ptr_pthread_functions);

  /* Determine whether the machine is SMP or not.  */
  __is_smp = is_smp_system ();
}
strong_alias (__pthread_initialize_minimal_internal,
	      __pthread_initialize_minimal)


size_t
__pthread_get_minstack (const pthread_attr_t *attr)
{
  struct pthread_attr *iattr = (struct pthread_attr *) attr;

  return (GLRO(dl_pagesize) + __static_tls_size + PTHREAD_STACK_MIN
	  + iattr->guardsize);
}