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/sched.h> 41 #include <sys/sysctl.h> 42 #include <sys/smp.h> 43 #include <sys/syscallsubr.h> 44 #include <sys/sysent.h> 45 #include <sys/systm.h> 46 #include <sys/sysproto.h> 47 #include <sys/signalvar.h> 48 #include <sys/ucontext.h> 49 #include <sys/thr.h> 50 #include <sys/rtprio.h> 51 #include <sys/umtx.h> 52 #include <sys/limits.h> 53 54 #include <machine/frame.h> 55 56 #include <security/audit/audit.h> 57 58 #ifdef COMPAT_IA32 59 60 extern struct sysentvec ia32_freebsd_sysvec; 61 62 static inline int 63 suword_lwpid(void *addr, lwpid_t lwpid) 64 { 65 int error; 66 67 if (curproc->p_sysent != &ia32_freebsd_sysvec) 68 error = suword(addr, lwpid); 69 else 70 error = suword32(addr, lwpid); 71 return (error); 72 } 73 74 #else 75 #define suword_lwpid suword 76 #endif 77 78 extern int max_threads_per_proc; 79 extern int max_threads_hits; 80 81 static int create_thread(struct thread *td, mcontext_t *ctx, 82 void (*start_func)(void *), void *arg, 83 char *stack_base, size_t stack_size, 84 char *tls_base, 85 long *child_tid, long *parent_tid, 86 int flags, struct rtprio *rtp); 87 88 /* 89 * System call interface. 90 */ 91 int 92 thr_create(struct thread *td, struct thr_create_args *uap) 93 /* ucontext_t *ctx, long *id, int flags */ 94 { 95 ucontext_t ctx; 96 int error; 97 98 if ((error = copyin(uap->ctx, &ctx, sizeof(ctx)))) 99 return (error); 100 101 error = create_thread(td, &ctx.uc_mcontext, NULL, NULL, 102 NULL, 0, NULL, uap->id, NULL, uap->flags, NULL); 103 return (error); 104 } 105 106 int 107 thr_new(struct thread *td, struct thr_new_args *uap) 108 /* struct thr_param * */ 109 { 110 struct thr_param param; 111 int error; 112 113 if (uap->param_size < 0 || uap->param_size > sizeof(param)) 114 return (EINVAL); 115 bzero(¶m, sizeof(param)); 116 if ((error = copyin(uap->param, ¶m, uap->param_size))) 117 return (error); 118 return (kern_thr_new(td, ¶m)); 119 } 120 121 int 122 kern_thr_new(struct thread *td, struct thr_param *param) 123 { 124 struct rtprio rtp, *rtpp; 125 int error; 126 127 rtpp = NULL; 128 if (param->rtp != 0) { 129 error = copyin(param->rtp, &rtp, sizeof(struct rtprio)); 130 if (error) 131 return (error); 132 rtpp = &rtp; 133 } 134 error = create_thread(td, NULL, param->start_func, param->arg, 135 param->stack_base, param->stack_size, param->tls_base, 136 param->child_tid, param->parent_tid, param->flags, 137 rtpp); 138 return (error); 139 } 140 141 static int 142 create_thread(struct thread *td, mcontext_t *ctx, 143 void (*start_func)(void *), void *arg, 144 char *stack_base, size_t stack_size, 145 char *tls_base, 146 long *child_tid, long *parent_tid, 147 int flags, struct rtprio *rtp) 148 { 149 stack_t stack; 150 struct thread *newtd; 151 struct proc *p; 152 int error; 153 154 error = 0; 155 p = td->td_proc; 156 157 /* Have race condition but it is cheap. */ 158 if (p->p_numthreads >= max_threads_per_proc) { 159 ++max_threads_hits; 160 return (EPROCLIM); 161 } 162 163 if (rtp != NULL) { 164 switch(rtp->type) { 165 case RTP_PRIO_REALTIME: 166 case RTP_PRIO_FIFO: 167 /* Only root can set scheduler policy */ 168 if (priv_check(td, PRIV_SCHED_SETPOLICY) != 0) 169 return (EPERM); 170 if (rtp->prio > RTP_PRIO_MAX) 171 return (EINVAL); 172 break; 173 case RTP_PRIO_NORMAL: 174 rtp->prio = 0; 175 break; 176 default: 177 return (EINVAL); 178 } 179 } 180 181 /* Initialize our td */ 182 newtd = thread_alloc(); 183 if (newtd == NULL) 184 return (ENOMEM); 185 186 /* 187 * Try the copyout as soon as we allocate the td so we don't 188 * have to tear things down in a failure case below. 189 * Here we copy out tid to two places, one for child and one 190 * for parent, because pthread can create a detached thread, 191 * if parent wants to safely access child tid, it has to provide 192 * its storage, because child thread may exit quickly and 193 * memory is freed before parent thread can access it. 194 */ 195 if ((child_tid != NULL && 196 suword_lwpid(child_tid, newtd->td_tid)) || 197 (parent_tid != NULL && 198 suword_lwpid(parent_tid, newtd->td_tid))) { 199 thread_free(newtd); 200 return (EFAULT); 201 } 202 203 bzero(&newtd->td_startzero, 204 __rangeof(struct thread, td_startzero, td_endzero)); 205 bcopy(&td->td_startcopy, &newtd->td_startcopy, 206 __rangeof(struct thread, td_startcopy, td_endcopy)); 207 newtd->td_proc = td->td_proc; 208 newtd->td_ucred = crhold(td->td_ucred); 209 210 cpu_set_upcall(newtd, td); 211 212 if (ctx != NULL) { /* old way to set user context */ 213 error = set_mcontext(newtd, ctx); 214 if (error != 0) { 215 thread_free(newtd); 216 crfree(td->td_ucred); 217 return (error); 218 } 219 } else { 220 /* Set up our machine context. */ 221 stack.ss_sp = stack_base; 222 stack.ss_size = stack_size; 223 /* Set upcall address to user thread entry function. */ 224 cpu_set_upcall_kse(newtd, start_func, arg, &stack); 225 /* Setup user TLS address and TLS pointer register. */ 226 error = cpu_set_user_tls(newtd, tls_base); 227 if (error != 0) { 228 thread_free(newtd); 229 crfree(td->td_ucred); 230 return (error); 231 } 232 } 233 234 PROC_LOCK(td->td_proc); 235 td->td_proc->p_flag |= P_HADTHREADS; 236 newtd->td_sigmask = td->td_sigmask; 237 thread_link(newtd, p); 238 bcopy(p->p_comm, newtd->td_name, sizeof(newtd->td_name)); 239 thread_lock(td); 240 /* let the scheduler know about these things. */ 241 sched_fork_thread(td, newtd); 242 thread_unlock(td); 243 if (P_SHOULDSTOP(p)) 244 newtd->td_flags |= TDF_ASTPENDING | TDF_NEEDSUSPCHK; 245 PROC_UNLOCK(p); 246 thread_lock(newtd); 247 if (rtp != NULL) { 248 if (!(td->td_pri_class == PRI_TIMESHARE && 249 rtp->type == RTP_PRIO_NORMAL)) { 250 rtp_to_pri(rtp, newtd); 251 sched_prio(newtd, newtd->td_user_pri); 252 } /* ignore timesharing class */ 253 } 254 TD_SET_CAN_RUN(newtd); 255 sched_add(newtd, SRQ_BORING); 256 thread_unlock(newtd); 257 258 return (error); 259 } 260 261 int 262 thr_self(struct thread *td, struct thr_self_args *uap) 263 /* long *id */ 264 { 265 int error; 266 267 error = suword_lwpid(uap->id, (unsigned)td->td_tid); 268 if (error == -1) 269 return (EFAULT); 270 return (0); 271 } 272 273 int 274 thr_exit(struct thread *td, struct thr_exit_args *uap) 275 /* long *state */ 276 { 277 struct proc *p; 278 279 p = td->td_proc; 280 281 /* Signal userland that it can free the stack. */ 282 if ((void *)uap->state != NULL) { 283 suword_lwpid(uap->state, 1); 284 kern_umtx_wake(td, uap->state, INT_MAX, 0); 285 } 286 287 PROC_LOCK(p); 288 sigqueue_flush(&td->td_sigqueue); 289 290 /* 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 thread_stopped(p); 296 PROC_SLOCK(p); 297 thread_exit(); 298 /* NOTREACHED */ 299 } 300 PROC_UNLOCK(p); 301 return (0); 302 } 303 304 int 305 thr_kill(struct thread *td, struct thr_kill_args *uap) 306 /* long id, int sig */ 307 { 308 struct thread *ttd; 309 struct proc *p; 310 int error; 311 312 p = td->td_proc; 313 error = 0; 314 PROC_LOCK(p); 315 if (uap->id == -1) { 316 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) { 317 error = EINVAL; 318 } else { 319 error = ESRCH; 320 FOREACH_THREAD_IN_PROC(p, ttd) { 321 if (ttd != td) { 322 error = 0; 323 if (uap->sig == 0) 324 break; 325 tdsignal(p, ttd, uap->sig, NULL); 326 } 327 } 328 } 329 } else { 330 if (uap->id != td->td_tid) 331 ttd = thread_find(p, uap->id); 332 else 333 ttd = td; 334 if (ttd == NULL) 335 error = ESRCH; 336 else if (uap->sig == 0) 337 ; 338 else if (!_SIG_VALID(uap->sig)) 339 error = EINVAL; 340 else 341 tdsignal(p, ttd, uap->sig, NULL); 342 } 343 PROC_UNLOCK(p); 344 return (error); 345 } 346 347 int 348 thr_kill2(struct thread *td, struct thr_kill2_args *uap) 349 /* pid_t pid, long id, int sig */ 350 { 351 struct thread *ttd; 352 struct proc *p; 353 int error; 354 355 AUDIT_ARG(signum, uap->sig); 356 357 if (uap->pid == td->td_proc->p_pid) { 358 p = td->td_proc; 359 PROC_LOCK(p); 360 } else if ((p = pfind(uap->pid)) == NULL) { 361 return (ESRCH); 362 } 363 AUDIT_ARG(process, p); 364 365 error = p_cansignal(td, p, uap->sig); 366 if (error == 0) { 367 if (uap->id == -1) { 368 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) { 369 error = EINVAL; 370 } else { 371 error = ESRCH; 372 FOREACH_THREAD_IN_PROC(p, ttd) { 373 if (ttd != td) { 374 error = 0; 375 if (uap->sig == 0) 376 break; 377 tdsignal(p, ttd, uap->sig, NULL); 378 } 379 } 380 } 381 } else { 382 if (uap->id != td->td_tid) 383 ttd = thread_find(p, uap->id); 384 else 385 ttd = td; 386 if (ttd == NULL) 387 error = ESRCH; 388 else if (uap->sig == 0) 389 ; 390 else if (!_SIG_VALID(uap->sig)) 391 error = EINVAL; 392 else 393 tdsignal(p, ttd, uap->sig, NULL); 394 } 395 } 396 PROC_UNLOCK(p); 397 return (error); 398 } 399 400 int 401 thr_suspend(struct thread *td, struct thr_suspend_args *uap) 402 /* const struct timespec *timeout */ 403 { 404 struct timespec ts, *tsp; 405 int error; 406 407 error = 0; 408 tsp = NULL; 409 if (uap->timeout != NULL) { 410 error = copyin((const void *)uap->timeout, (void *)&ts, 411 sizeof(struct timespec)); 412 if (error != 0) 413 return (error); 414 tsp = &ts; 415 } 416 417 return (kern_thr_suspend(td, tsp)); 418 } 419 420 int 421 kern_thr_suspend(struct thread *td, struct timespec *tsp) 422 { 423 struct timeval tv; 424 int error = 0, hz = 0; 425 426 if (tsp != NULL) { 427 if (tsp->tv_nsec < 0 || tsp->tv_nsec > 1000000000) 428 return (EINVAL); 429 if (tsp->tv_sec == 0 && tsp->tv_nsec == 0) 430 return (ETIMEDOUT); 431 TIMESPEC_TO_TIMEVAL(&tv, tsp); 432 hz = tvtohz(&tv); 433 } 434 435 if (td->td_pflags & TDP_WAKEUP) { 436 td->td_pflags &= ~TDP_WAKEUP; 437 return (0); 438 } 439 440 PROC_LOCK(td->td_proc); 441 if ((td->td_flags & TDF_THRWAKEUP) == 0) 442 error = msleep((void *)td, &td->td_proc->p_mtx, PCATCH, "lthr", 443 hz); 444 if (td->td_flags & TDF_THRWAKEUP) { 445 thread_lock(td); 446 td->td_flags &= ~TDF_THRWAKEUP; 447 thread_unlock(td); 448 PROC_UNLOCK(td->td_proc); 449 return (0); 450 } 451 PROC_UNLOCK(td->td_proc); 452 if (error == EWOULDBLOCK) 453 error = ETIMEDOUT; 454 else if (error == ERESTART) { 455 if (hz != 0) 456 error = EINTR; 457 } 458 return (error); 459 } 460 461 int 462 thr_wake(struct thread *td, struct thr_wake_args *uap) 463 /* long id */ 464 { 465 struct proc *p; 466 struct thread *ttd; 467 468 if (uap->id == td->td_tid) { 469 td->td_pflags |= TDP_WAKEUP; 470 return (0); 471 } 472 473 p = td->td_proc; 474 PROC_LOCK(p); 475 ttd = thread_find(p, uap->id); 476 if (ttd == NULL) { 477 PROC_UNLOCK(p); 478 return (ESRCH); 479 } 480 thread_lock(ttd); 481 ttd->td_flags |= TDF_THRWAKEUP; 482 thread_unlock(ttd); 483 wakeup((void *)ttd); 484 PROC_UNLOCK(p); 485 return (0); 486 } 487 488 int 489 thr_set_name(struct thread *td, struct thr_set_name_args *uap) 490 { 491 struct proc *p = td->td_proc; 492 char name[MAXCOMLEN + 1]; 493 struct thread *ttd; 494 int error; 495 496 error = 0; 497 name[0] = '\0'; 498 if (uap->name != NULL) { 499 error = copyinstr(uap->name, name, sizeof(name), 500 NULL); 501 if (error) 502 return (error); 503 } 504 PROC_LOCK(p); 505 if (uap->id == td->td_tid) 506 ttd = td; 507 else 508 ttd = thread_find(p, uap->id); 509 if (ttd != NULL) 510 strcpy(ttd->td_name, name); 511 else 512 error = ESRCH; 513 PROC_UNLOCK(p); 514 return (error); 515 } 516