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 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 error = 0; 154 p = td->td_proc; 155 156 /* Have race condition but it is cheap. */ 157 if (p->p_numthreads >= max_threads_per_proc) 158 return (EPROCLIM); 159 160 if (rtp != NULL) { 161 switch(rtp->type) { 162 case RTP_PRIO_REALTIME: 163 case RTP_PRIO_FIFO: 164 /* Only root can set scheduler policy */ 165 if (priv_check(td, PRIV_SCHED_SETPOLICY) != 0) 166 return (EPERM); 167 if (rtp->prio > RTP_PRIO_MAX) 168 return (EINVAL); 169 break; 170 case RTP_PRIO_NORMAL: 171 rtp->prio = 0; 172 break; 173 default: 174 return (EINVAL); 175 } 176 } 177 178 /* Initialize our td */ 179 newtd = thread_alloc(); 180 if (newtd == NULL) 181 return (ENOMEM); 182 183 /* 184 * Try the copyout as soon as we allocate the td so we don't 185 * have to tear things down in a failure case below. 186 * Here we copy out tid to two places, one for child and one 187 * for parent, because pthread can create a detached thread, 188 * if parent wants to safely access child tid, it has to provide 189 * its storage, because child thread may exit quickly and 190 * memory is freed before parent thread can access it. 191 */ 192 if ((child_tid != NULL && 193 suword_lwpid(child_tid, newtd->td_tid)) || 194 (parent_tid != NULL && 195 suword_lwpid(parent_tid, newtd->td_tid))) { 196 thread_free(newtd); 197 return (EFAULT); 198 } 199 200 bzero(&newtd->td_startzero, 201 __rangeof(struct thread, td_startzero, td_endzero)); 202 bcopy(&td->td_startcopy, &newtd->td_startcopy, 203 __rangeof(struct thread, td_startcopy, td_endcopy)); 204 newtd->td_proc = td->td_proc; 205 newtd->td_ucred = crhold(td->td_ucred); 206 207 cpu_set_upcall(newtd, td); 208 209 if (ctx != NULL) { /* old way to set user context */ 210 error = set_mcontext(newtd, ctx); 211 if (error != 0) { 212 thread_free(newtd); 213 crfree(td->td_ucred); 214 return (error); 215 } 216 } else { 217 /* Set up our machine context. */ 218 stack.ss_sp = stack_base; 219 stack.ss_size = stack_size; 220 /* Set upcall address to user thread entry function. */ 221 cpu_set_upcall_kse(newtd, start_func, arg, &stack); 222 /* Setup user TLS address and TLS pointer register. */ 223 error = cpu_set_user_tls(newtd, tls_base); 224 if (error != 0) { 225 thread_free(newtd); 226 crfree(td->td_ucred); 227 return (error); 228 } 229 } 230 231 PROC_LOCK(td->td_proc); 232 td->td_proc->p_flag |= P_HADTHREADS; 233 newtd->td_sigmask = td->td_sigmask; 234 thread_link(newtd, p); 235 bcopy(p->p_comm, newtd->td_name, sizeof(newtd->td_name)); 236 thread_lock(td); 237 /* let the scheduler know about these things. */ 238 sched_fork_thread(td, newtd); 239 thread_unlock(td); 240 if (P_SHOULDSTOP(p)) 241 newtd->td_flags |= TDF_ASTPENDING | TDF_NEEDSUSPCHK; 242 PROC_UNLOCK(p); 243 thread_lock(newtd); 244 if (rtp != NULL) { 245 if (!(td->td_pri_class == PRI_TIMESHARE && 246 rtp->type == RTP_PRIO_NORMAL)) { 247 rtp_to_pri(rtp, newtd); 248 sched_prio(newtd, newtd->td_user_pri); 249 } /* ignore timesharing class */ 250 } 251 TD_SET_CAN_RUN(newtd); 252 sched_add(newtd, SRQ_BORING); 253 thread_unlock(newtd); 254 255 return (error); 256 } 257 258 int 259 thr_self(struct thread *td, struct thr_self_args *uap) 260 /* long *id */ 261 { 262 int error; 263 264 error = suword_lwpid(uap->id, (unsigned)td->td_tid); 265 if (error == -1) 266 return (EFAULT); 267 return (0); 268 } 269 270 int 271 thr_exit(struct thread *td, struct thr_exit_args *uap) 272 /* long *state */ 273 { 274 struct proc *p; 275 276 p = td->td_proc; 277 278 /* Signal userland that it can free the stack. */ 279 if ((void *)uap->state != NULL) { 280 suword_lwpid(uap->state, 1); 281 kern_umtx_wake(td, uap->state, INT_MAX, 0); 282 } 283 284 PROC_LOCK(p); 285 sigqueue_flush(&td->td_sigqueue); 286 PROC_SLOCK(p); 287 288 /* 289 * Shutting down last thread in the proc. This will actually 290 * call exit() in the trampoline when it returns. 291 */ 292 if (p->p_numthreads != 1) { 293 thread_stopped(p); 294 thread_exit(); 295 /* NOTREACHED */ 296 } 297 PROC_SUNLOCK(p); 298 PROC_UNLOCK(p); 299 return (0); 300 } 301 302 int 303 thr_kill(struct thread *td, struct thr_kill_args *uap) 304 /* long id, int sig */ 305 { 306 struct thread *ttd; 307 struct proc *p; 308 int error; 309 310 p = td->td_proc; 311 error = 0; 312 PROC_LOCK(p); 313 if (uap->id == -1) { 314 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) { 315 error = EINVAL; 316 } else { 317 error = ESRCH; 318 FOREACH_THREAD_IN_PROC(p, ttd) { 319 if (ttd != td) { 320 error = 0; 321 if (uap->sig == 0) 322 break; 323 tdsignal(p, ttd, uap->sig, NULL); 324 } 325 } 326 } 327 } else { 328 if (uap->id != td->td_tid) 329 ttd = thread_find(p, uap->id); 330 else 331 ttd = td; 332 if (ttd == NULL) 333 error = ESRCH; 334 else if (uap->sig == 0) 335 ; 336 else if (!_SIG_VALID(uap->sig)) 337 error = EINVAL; 338 else 339 tdsignal(p, ttd, uap->sig, NULL); 340 } 341 PROC_UNLOCK(p); 342 return (error); 343 } 344 345 int 346 thr_kill2(struct thread *td, struct thr_kill2_args *uap) 347 /* pid_t pid, long id, int sig */ 348 { 349 struct thread *ttd; 350 struct proc *p; 351 int error; 352 353 AUDIT_ARG(signum, uap->sig); 354 355 if (uap->pid == td->td_proc->p_pid) { 356 p = td->td_proc; 357 PROC_LOCK(p); 358 } else if ((p = pfind(uap->pid)) == NULL) { 359 return (ESRCH); 360 } 361 AUDIT_ARG(process, p); 362 363 error = p_cansignal(td, p, uap->sig); 364 if (error == 0) { 365 if (uap->id == -1) { 366 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) { 367 error = EINVAL; 368 } else { 369 error = ESRCH; 370 FOREACH_THREAD_IN_PROC(p, ttd) { 371 if (ttd != td) { 372 error = 0; 373 if (uap->sig == 0) 374 break; 375 tdsignal(p, ttd, uap->sig, NULL); 376 } 377 } 378 } 379 } else { 380 if (uap->id != td->td_tid) 381 ttd = thread_find(p, uap->id); 382 else 383 ttd = td; 384 if (ttd == NULL) 385 error = ESRCH; 386 else if (uap->sig == 0) 387 ; 388 else if (!_SIG_VALID(uap->sig)) 389 error = EINVAL; 390 else 391 tdsignal(p, ttd, uap->sig, NULL); 392 } 393 } 394 PROC_UNLOCK(p); 395 return (error); 396 } 397 398 int 399 thr_suspend(struct thread *td, struct thr_suspend_args *uap) 400 /* const struct timespec *timeout */ 401 { 402 struct timespec ts, *tsp; 403 int error; 404 405 error = 0; 406 tsp = NULL; 407 if (uap->timeout != NULL) { 408 error = copyin((const void *)uap->timeout, (void *)&ts, 409 sizeof(struct timespec)); 410 if (error != 0) 411 return (error); 412 tsp = &ts; 413 } 414 415 return (kern_thr_suspend(td, tsp)); 416 } 417 418 int 419 kern_thr_suspend(struct thread *td, struct timespec *tsp) 420 { 421 struct timeval tv; 422 int error = 0, hz = 0; 423 424 if (tsp != NULL) { 425 if (tsp->tv_nsec < 0 || tsp->tv_nsec > 1000000000) 426 return (EINVAL); 427 if (tsp->tv_sec == 0 && tsp->tv_nsec == 0) 428 return (ETIMEDOUT); 429 TIMESPEC_TO_TIMEVAL(&tv, tsp); 430 hz = tvtohz(&tv); 431 } 432 433 if (td->td_pflags & TDP_WAKEUP) { 434 td->td_pflags &= ~TDP_WAKEUP; 435 return (0); 436 } 437 438 PROC_LOCK(td->td_proc); 439 if ((td->td_flags & TDF_THRWAKEUP) == 0) 440 error = msleep((void *)td, &td->td_proc->p_mtx, PCATCH, "lthr", 441 hz); 442 if (td->td_flags & TDF_THRWAKEUP) { 443 thread_lock(td); 444 td->td_flags &= ~TDF_THRWAKEUP; 445 thread_unlock(td); 446 PROC_UNLOCK(td->td_proc); 447 return (0); 448 } 449 PROC_UNLOCK(td->td_proc); 450 if (error == EWOULDBLOCK) 451 error = ETIMEDOUT; 452 else if (error == ERESTART) { 453 if (hz != 0) 454 error = EINTR; 455 } 456 return (error); 457 } 458 459 int 460 thr_wake(struct thread *td, struct thr_wake_args *uap) 461 /* long id */ 462 { 463 struct proc *p; 464 struct thread *ttd; 465 466 if (uap->id == td->td_tid) { 467 td->td_pflags |= TDP_WAKEUP; 468 return (0); 469 } 470 471 p = td->td_proc; 472 PROC_LOCK(p); 473 ttd = thread_find(p, uap->id); 474 if (ttd == NULL) { 475 PROC_UNLOCK(p); 476 return (ESRCH); 477 } 478 thread_lock(ttd); 479 ttd->td_flags |= TDF_THRWAKEUP; 480 thread_unlock(ttd); 481 wakeup((void *)ttd); 482 PROC_UNLOCK(p); 483 return (0); 484 } 485 486 int 487 thr_set_name(struct thread *td, struct thr_set_name_args *uap) 488 { 489 struct proc *p = td->td_proc; 490 char name[MAXCOMLEN + 1]; 491 struct thread *ttd; 492 int error; 493 494 error = 0; 495 name[0] = '\0'; 496 if (uap->name != NULL) { 497 error = copyinstr(uap->name, name, sizeof(name), 498 NULL); 499 if (error) 500 return (error); 501 } 502 PROC_LOCK(p); 503 if (uap->id == td->td_tid) 504 ttd = td; 505 else 506 ttd = thread_find(p, uap->id); 507 if (ttd != NULL) 508 strcpy(ttd->td_name, name); 509 else 510 error = ESRCH; 511 PROC_UNLOCK(p); 512 return (error); 513 } 514