1 /*- 2 * Copyright (c) 2003, Jeffrey Roberson <jeff@freebsd.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include "opt_compat.h" 31 #include "opt_posix.h" 32 #include <sys/param.h> 33 #include <sys/kernel.h> 34 #include <sys/lock.h> 35 #include <sys/mutex.h> 36 #include <sys/priv.h> 37 #include <sys/proc.h> 38 #include <sys/posix4.h> 39 #include <sys/resourcevar.h> 40 #include <sys/rwlock.h> 41 #include <sys/sched.h> 42 #include <sys/sysctl.h> 43 #include <sys/smp.h> 44 #include <sys/syscallsubr.h> 45 #include <sys/sysent.h> 46 #include <sys/systm.h> 47 #include <sys/sysproto.h> 48 #include <sys/signalvar.h> 49 #include <sys/ucontext.h> 50 #include <sys/thr.h> 51 #include <sys/rtprio.h> 52 #include <sys/umtx.h> 53 #include <sys/limits.h> 54 55 #include <machine/frame.h> 56 57 #include <security/audit/audit.h> 58 59 #ifdef COMPAT_FREEBSD32 60 61 static inline int 62 suword_lwpid(void *addr, lwpid_t lwpid) 63 { 64 int error; 65 66 if (SV_CURPROC_FLAG(SV_LP64)) 67 error = suword(addr, lwpid); 68 else 69 error = suword32(addr, lwpid); 70 return (error); 71 } 72 73 #else 74 #define suword_lwpid suword 75 #endif 76 77 extern int max_threads_per_proc; 78 extern int max_threads_hits; 79 80 static int create_thread(struct thread *td, mcontext_t *ctx, 81 void (*start_func)(void *), void *arg, 82 char *stack_base, size_t stack_size, 83 char *tls_base, 84 long *child_tid, long *parent_tid, 85 int flags, struct rtprio *rtp); 86 87 /* 88 * System call interface. 89 */ 90 int 91 thr_create(struct thread *td, struct thr_create_args *uap) 92 /* ucontext_t *ctx, long *id, int flags */ 93 { 94 ucontext_t ctx; 95 int error; 96 97 if ((error = copyin(uap->ctx, &ctx, sizeof(ctx)))) 98 return (error); 99 100 error = create_thread(td, &ctx.uc_mcontext, NULL, NULL, 101 NULL, 0, NULL, uap->id, NULL, uap->flags, NULL); 102 return (error); 103 } 104 105 int 106 thr_new(struct thread *td, struct thr_new_args *uap) 107 /* struct thr_param * */ 108 { 109 struct thr_param param; 110 int error; 111 112 if (uap->param_size < 0 || uap->param_size > sizeof(param)) 113 return (EINVAL); 114 bzero(¶m, sizeof(param)); 115 if ((error = copyin(uap->param, ¶m, uap->param_size))) 116 return (error); 117 return (kern_thr_new(td, ¶m)); 118 } 119 120 int 121 kern_thr_new(struct thread *td, struct thr_param *param) 122 { 123 struct rtprio rtp, *rtpp; 124 int error; 125 126 rtpp = NULL; 127 if (param->rtp != 0) { 128 error = copyin(param->rtp, &rtp, sizeof(struct rtprio)); 129 if (error) 130 return (error); 131 rtpp = &rtp; 132 } 133 error = create_thread(td, NULL, param->start_func, param->arg, 134 param->stack_base, param->stack_size, param->tls_base, 135 param->child_tid, param->parent_tid, param->flags, 136 rtpp); 137 return (error); 138 } 139 140 static int 141 create_thread(struct thread *td, mcontext_t *ctx, 142 void (*start_func)(void *), void *arg, 143 char *stack_base, size_t stack_size, 144 char *tls_base, 145 long *child_tid, long *parent_tid, 146 int flags, struct rtprio *rtp) 147 { 148 stack_t stack; 149 struct thread *newtd; 150 struct proc *p; 151 int error; 152 153 p = td->td_proc; 154 155 /* Have race condition but it is cheap. */ 156 if (p->p_numthreads >= max_threads_per_proc) { 157 ++max_threads_hits; 158 return (EPROCLIM); 159 } 160 161 if (rtp != NULL) { 162 switch(rtp->type) { 163 case RTP_PRIO_REALTIME: 164 case RTP_PRIO_FIFO: 165 /* Only root can set scheduler policy */ 166 if (priv_check(td, PRIV_SCHED_SETPOLICY) != 0) 167 return (EPERM); 168 if (rtp->prio > RTP_PRIO_MAX) 169 return (EINVAL); 170 break; 171 case RTP_PRIO_NORMAL: 172 rtp->prio = 0; 173 break; 174 default: 175 return (EINVAL); 176 } 177 } 178 179 /* Initialize our td */ 180 newtd = thread_alloc(0); 181 if (newtd == NULL) 182 return (ENOMEM); 183 184 /* 185 * Try the copyout as soon as we allocate the td so we don't 186 * have to tear things down in a failure case below. 187 * Here we copy out tid to two places, one for child and one 188 * for parent, because pthread can create a detached thread, 189 * if parent wants to safely access child tid, it has to provide 190 * its storage, because child thread may exit quickly and 191 * memory is freed before parent thread can access it. 192 */ 193 if ((child_tid != NULL && 194 suword_lwpid(child_tid, newtd->td_tid)) || 195 (parent_tid != NULL && 196 suword_lwpid(parent_tid, newtd->td_tid))) { 197 thread_free(newtd); 198 return (EFAULT); 199 } 200 201 bzero(&newtd->td_startzero, 202 __rangeof(struct thread, td_startzero, td_endzero)); 203 bcopy(&td->td_startcopy, &newtd->td_startcopy, 204 __rangeof(struct thread, td_startcopy, td_endcopy)); 205 newtd->td_proc = td->td_proc; 206 newtd->td_ucred = crhold(td->td_ucred); 207 208 cpu_set_upcall(newtd, td); 209 210 if (ctx != NULL) { /* old way to set user context */ 211 error = set_mcontext(newtd, ctx); 212 if (error != 0) { 213 thread_free(newtd); 214 crfree(td->td_ucred); 215 return (error); 216 } 217 } else { 218 /* Set up our machine context. */ 219 stack.ss_sp = stack_base; 220 stack.ss_size = stack_size; 221 /* Set upcall address to user thread entry function. */ 222 cpu_set_upcall_kse(newtd, start_func, arg, &stack); 223 /* Setup user TLS address and TLS pointer register. */ 224 error = cpu_set_user_tls(newtd, tls_base); 225 if (error != 0) { 226 thread_free(newtd); 227 crfree(td->td_ucred); 228 return (error); 229 } 230 } 231 232 PROC_LOCK(td->td_proc); 233 td->td_proc->p_flag |= P_HADTHREADS; 234 newtd->td_sigmask = td->td_sigmask; 235 thread_link(newtd, p); 236 bcopy(p->p_comm, newtd->td_name, sizeof(newtd->td_name)); 237 thread_lock(td); 238 /* let the scheduler know about these things. */ 239 sched_fork_thread(td, newtd); 240 thread_unlock(td); 241 if (P_SHOULDSTOP(p)) 242 newtd->td_flags |= TDF_ASTPENDING | TDF_NEEDSUSPCHK; 243 PROC_UNLOCK(p); 244 245 tidhash_add(newtd); 246 247 thread_lock(newtd); 248 if (rtp != NULL) { 249 if (!(td->td_pri_class == PRI_TIMESHARE && 250 rtp->type == RTP_PRIO_NORMAL)) { 251 rtp_to_pri(rtp, newtd); 252 sched_prio(newtd, newtd->td_user_pri); 253 } /* ignore timesharing class */ 254 } 255 TD_SET_CAN_RUN(newtd); 256 sched_add(newtd, SRQ_BORING); 257 thread_unlock(newtd); 258 259 return (0); 260 } 261 262 int 263 thr_self(struct thread *td, struct thr_self_args *uap) 264 /* long *id */ 265 { 266 int error; 267 268 error = suword_lwpid(uap->id, (unsigned)td->td_tid); 269 if (error == -1) 270 return (EFAULT); 271 return (0); 272 } 273 274 int 275 thr_exit(struct thread *td, struct thr_exit_args *uap) 276 /* long *state */ 277 { 278 struct proc *p; 279 280 p = td->td_proc; 281 282 /* Signal userland that it can free the stack. */ 283 if ((void *)uap->state != NULL) { 284 suword_lwpid(uap->state, 1); 285 kern_umtx_wake(td, uap->state, INT_MAX, 0); 286 } 287 288 rw_wlock(&tidhash_lock); 289 PROC_LOCK(p); 290 /* 291 * Shutting down last thread in the proc. This will actually 292 * call exit() in the trampoline when it returns. 293 */ 294 if (p->p_numthreads != 1) { 295 LIST_REMOVE(td, td_hash); 296 rw_wunlock(&tidhash_lock); 297 tdsigcleanup(td); 298 PROC_SLOCK(p); 299 thread_stopped(p); 300 thread_exit(); 301 /* NOTREACHED */ 302 } 303 PROC_UNLOCK(p); 304 rw_wunlock(&tidhash_lock); 305 return (0); 306 } 307 308 int 309 thr_kill(struct thread *td, struct thr_kill_args *uap) 310 /* long id, int sig */ 311 { 312 ksiginfo_t ksi; 313 struct thread *ttd; 314 struct proc *p; 315 int error; 316 317 p = td->td_proc; 318 ksiginfo_init(&ksi); 319 ksi.ksi_signo = uap->sig; 320 ksi.ksi_code = SI_LWP; 321 ksi.ksi_pid = p->p_pid; 322 ksi.ksi_uid = td->td_ucred->cr_ruid; 323 if (uap->id == -1) { 324 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) { 325 error = EINVAL; 326 } else { 327 error = ESRCH; 328 PROC_LOCK(p); 329 FOREACH_THREAD_IN_PROC(p, ttd) { 330 if (ttd != td) { 331 error = 0; 332 if (uap->sig == 0) 333 break; 334 tdksignal(ttd, uap->sig, &ksi); 335 } 336 } 337 PROC_UNLOCK(p); 338 } 339 } else { 340 error = 0; 341 ttd = tdfind((lwpid_t)uap->id, p->p_pid); 342 if (ttd == NULL) 343 return (ESRCH); 344 if (uap->sig == 0) 345 ; 346 else if (!_SIG_VALID(uap->sig)) 347 error = EINVAL; 348 else 349 tdksignal(ttd, uap->sig, &ksi); 350 PROC_UNLOCK(ttd->td_proc); 351 } 352 return (error); 353 } 354 355 int 356 thr_kill2(struct thread *td, struct thr_kill2_args *uap) 357 /* pid_t pid, long id, int sig */ 358 { 359 ksiginfo_t ksi; 360 struct thread *ttd; 361 struct proc *p; 362 int error; 363 364 AUDIT_ARG_SIGNUM(uap->sig); 365 366 ksiginfo_init(&ksi); 367 ksi.ksi_signo = uap->sig; 368 ksi.ksi_code = SI_LWP; 369 ksi.ksi_pid = td->td_proc->p_pid; 370 ksi.ksi_uid = td->td_ucred->cr_ruid; 371 if (uap->id == -1) { 372 if ((p = pfind(uap->pid)) == NULL) 373 return (ESRCH); 374 AUDIT_ARG_PROCESS(p); 375 error = p_cansignal(td, p, uap->sig); 376 if (error) { 377 PROC_UNLOCK(p); 378 return (error); 379 } 380 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) { 381 error = EINVAL; 382 } else { 383 error = ESRCH; 384 FOREACH_THREAD_IN_PROC(p, ttd) { 385 if (ttd != td) { 386 error = 0; 387 if (uap->sig == 0) 388 break; 389 tdksignal(ttd, uap->sig, &ksi); 390 } 391 } 392 } 393 PROC_UNLOCK(p); 394 } else { 395 ttd = tdfind((lwpid_t)uap->id, uap->pid); 396 if (ttd == NULL) 397 return (ESRCH); 398 p = ttd->td_proc; 399 AUDIT_ARG_PROCESS(p); 400 error = p_cansignal(td, p, uap->sig); 401 if (uap->sig == 0) 402 ; 403 else if (!_SIG_VALID(uap->sig)) 404 error = EINVAL; 405 else 406 tdksignal(ttd, uap->sig, &ksi); 407 PROC_UNLOCK(p); 408 } 409 return (error); 410 } 411 412 int 413 thr_suspend(struct thread *td, struct thr_suspend_args *uap) 414 /* const struct timespec *timeout */ 415 { 416 struct timespec ts, *tsp; 417 int error; 418 419 tsp = NULL; 420 if (uap->timeout != NULL) { 421 error = copyin((const void *)uap->timeout, (void *)&ts, 422 sizeof(struct timespec)); 423 if (error != 0) 424 return (error); 425 tsp = &ts; 426 } 427 428 return (kern_thr_suspend(td, tsp)); 429 } 430 431 int 432 kern_thr_suspend(struct thread *td, struct timespec *tsp) 433 { 434 struct proc *p = td->td_proc; 435 struct timeval tv; 436 int error = 0; 437 int timo = 0; 438 439 if (td->td_pflags & TDP_WAKEUP) { 440 td->td_pflags &= ~TDP_WAKEUP; 441 return (0); 442 } 443 444 if (tsp != NULL) { 445 if (tsp->tv_nsec < 0 || tsp->tv_nsec > 1000000000) 446 return (EINVAL); 447 if (tsp->tv_sec == 0 && tsp->tv_nsec == 0) 448 error = EWOULDBLOCK; 449 else { 450 TIMESPEC_TO_TIMEVAL(&tv, tsp); 451 timo = tvtohz(&tv); 452 } 453 } 454 455 PROC_LOCK(p); 456 if (error == 0 && (td->td_flags & TDF_THRWAKEUP) == 0) 457 error = msleep((void *)td, &p->p_mtx, 458 PCATCH, "lthr", timo); 459 460 if (td->td_flags & TDF_THRWAKEUP) { 461 thread_lock(td); 462 td->td_flags &= ~TDF_THRWAKEUP; 463 thread_unlock(td); 464 PROC_UNLOCK(p); 465 return (0); 466 } 467 PROC_UNLOCK(p); 468 if (error == EWOULDBLOCK) 469 error = ETIMEDOUT; 470 else if (error == ERESTART) { 471 if (timo != 0) 472 error = EINTR; 473 } 474 return (error); 475 } 476 477 int 478 thr_wake(struct thread *td, struct thr_wake_args *uap) 479 /* long id */ 480 { 481 struct proc *p; 482 struct thread *ttd; 483 484 if (uap->id == td->td_tid) { 485 td->td_pflags |= TDP_WAKEUP; 486 return (0); 487 } 488 489 p = td->td_proc; 490 ttd = tdfind((lwpid_t)uap->id, p->p_pid); 491 if (ttd == NULL) 492 return (ESRCH); 493 thread_lock(ttd); 494 ttd->td_flags |= TDF_THRWAKEUP; 495 thread_unlock(ttd); 496 wakeup((void *)ttd); 497 PROC_UNLOCK(p); 498 return (0); 499 } 500 501 int 502 thr_set_name(struct thread *td, struct thr_set_name_args *uap) 503 { 504 struct proc *p; 505 char name[MAXCOMLEN + 1]; 506 struct thread *ttd; 507 int error; 508 509 error = 0; 510 name[0] = '\0'; 511 if (uap->name != NULL) { 512 error = copyinstr(uap->name, name, sizeof(name), 513 NULL); 514 if (error) 515 return (error); 516 } 517 p = td->td_proc; 518 ttd = tdfind((lwpid_t)uap->id, p->p_pid); 519 if (ttd == NULL) 520 return (ESRCH); 521 strcpy(ttd->td_name, name); 522 PROC_UNLOCK(p); 523 return (error); 524 } 525