linux_sched.c revision 1.29.8.4
1 /* $NetBSD: linux_sched.c,v 1.29.8.4 2006/09/03 15:23:41 yamt Exp $ */ 2 3 /*- 4 * Copyright (c) 1999 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 9 * NASA Ames Research Center; by Matthias Scheler. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 /* 41 * Linux compatibility module. Try to deal with scheduler related syscalls. 42 */ 43 44 #include <sys/cdefs.h> 45 __KERNEL_RCSID(0, "$NetBSD: linux_sched.c,v 1.29.8.4 2006/09/03 15:23:41 yamt Exp $"); 46 47 #include <sys/param.h> 48 #include <sys/mount.h> 49 #include <sys/proc.h> 50 #include <sys/systm.h> 51 #include <sys/sysctl.h> 52 #include <sys/malloc.h> 53 #include <sys/sa.h> 54 #include <sys/syscallargs.h> 55 #include <sys/wait.h> 56 #include <sys/kauth.h> 57 #include <sys/ptrace.h> 58 59 #include <machine/cpu.h> 60 61 #include <compat/linux/common/linux_types.h> 62 #include <compat/linux/common/linux_signal.h> 63 #include <compat/linux/common/linux_machdep.h> /* For LINUX_NPTL */ 64 #include <compat/linux/common/linux_emuldata.h> 65 66 #include <compat/linux/linux_syscallargs.h> 67 68 #include <compat/linux/common/linux_sched.h> 69 70 int 71 linux_sys_clone(l, v, retval) 72 struct lwp *l; 73 void *v; 74 register_t *retval; 75 { 76 struct linux_sys_clone_args /* { 77 syscallarg(int) flags; 78 syscallarg(void *) stack; 79 #ifdef LINUX_NPTL 80 syscallarg(void *) parent_tidptr; 81 syscallarg(void *) child_tidptr; 82 #endif 83 } */ *uap = v; 84 int flags, sig; 85 int error; 86 #ifdef LINUX_NPTL 87 struct linux_emuldata *led; 88 #endif 89 90 /* 91 * We don't support the Linux CLONE_PID or CLONE_PTRACE flags. 92 */ 93 if (SCARG(uap, flags) & (LINUX_CLONE_PID|LINUX_CLONE_PTRACE)) 94 return (EINVAL); 95 96 /* 97 * Thread group implies shared signals. Shared signals 98 * imply shared VM. This matches what Linux kernel does. 99 */ 100 if (SCARG(uap, flags) & LINUX_CLONE_THREAD 101 && (SCARG(uap, flags) & LINUX_CLONE_SIGHAND) == 0) 102 return (EINVAL); 103 if (SCARG(uap, flags) & LINUX_CLONE_SIGHAND 104 && (SCARG(uap, flags) & LINUX_CLONE_VM) == 0) 105 return (EINVAL); 106 107 flags = 0; 108 109 if (SCARG(uap, flags) & LINUX_CLONE_VM) 110 flags |= FORK_SHAREVM; 111 if (SCARG(uap, flags) & LINUX_CLONE_FS) 112 flags |= FORK_SHARECWD; 113 if (SCARG(uap, flags) & LINUX_CLONE_FILES) 114 flags |= FORK_SHAREFILES; 115 if (SCARG(uap, flags) & LINUX_CLONE_SIGHAND) 116 flags |= FORK_SHARESIGS; 117 if (SCARG(uap, flags) & LINUX_CLONE_VFORK) 118 flags |= FORK_PPWAIT; 119 120 sig = SCARG(uap, flags) & LINUX_CLONE_CSIGNAL; 121 if (sig < 0 || sig >= LINUX__NSIG) 122 return (EINVAL); 123 sig = linux_to_native_signo[sig]; 124 125 #ifdef LINUX_NPTL 126 led = (struct linux_emuldata *)l->l_proc->p_emuldata; 127 128 led->parent_tidptr = SCARG(uap, parent_tidptr); 129 led->child_tidptr = SCARG(uap, child_tidptr); 130 led->clone_flags = SCARG(uap, flags); 131 #endif /* LINUX_NPTL */ 132 133 /* 134 * Note that Linux does not provide a portable way of specifying 135 * the stack area; the caller must know if the stack grows up 136 * or down. So, we pass a stack size of 0, so that the code 137 * that makes this adjustment is a noop. 138 */ 139 if ((error = fork1(l, flags, sig, SCARG(uap, stack), 0, 140 NULL, NULL, retval, NULL)) != 0) 141 return error; 142 143 return 0; 144 } 145 146 int 147 linux_sys_sched_setparam(cl, v, retval) 148 struct lwp *cl; 149 void *v; 150 register_t *retval; 151 { 152 struct linux_sys_sched_setparam_args /* { 153 syscallarg(linux_pid_t) pid; 154 syscallarg(const struct linux_sched_param *) sp; 155 } */ *uap = v; 156 int error; 157 struct linux_sched_param lp; 158 struct proc *p; 159 160 /* 161 * We only check for valid parameters and return afterwards. 162 */ 163 164 if (SCARG(uap, pid) < 0 || SCARG(uap, sp) == NULL) 165 return EINVAL; 166 167 error = copyin(SCARG(uap, sp), &lp, sizeof(lp)); 168 if (error) 169 return error; 170 171 if (SCARG(uap, pid) != 0) { 172 kauth_cred_t pc = cl->l_cred; 173 174 if ((p = pfind(SCARG(uap, pid))) == NULL) 175 return ESRCH; 176 if (!(cl->l_proc == p || 177 kauth_cred_geteuid(pc) == 0 || 178 kauth_cred_getuid(pc) == kauth_cred_getuid(p->p_cred) || 179 kauth_cred_geteuid(pc) == kauth_cred_getuid(p->p_cred) || 180 kauth_cred_getuid(pc) == kauth_cred_geteuid(p->p_cred) || 181 kauth_cred_geteuid(pc) == kauth_cred_geteuid(p->p_cred))) 182 return EPERM; 183 } 184 185 return 0; 186 } 187 188 int 189 linux_sys_sched_getparam(cl, v, retval) 190 struct lwp *cl; 191 void *v; 192 register_t *retval; 193 { 194 struct linux_sys_sched_getparam_args /* { 195 syscallarg(linux_pid_t) pid; 196 syscallarg(struct linux_sched_param *) sp; 197 } */ *uap = v; 198 struct proc *p; 199 struct linux_sched_param lp; 200 201 /* 202 * We only check for valid parameters and return a dummy priority afterwards. 203 */ 204 if (SCARG(uap, pid) < 0 || SCARG(uap, sp) == NULL) 205 return EINVAL; 206 207 if (SCARG(uap, pid) != 0) { 208 kauth_cred_t pc = cl->l_cred; 209 210 if ((p = pfind(SCARG(uap, pid))) == NULL) 211 return ESRCH; 212 if (!(cl->l_proc == p || 213 kauth_cred_geteuid(pc) == 0 || 214 kauth_cred_getuid(pc) == kauth_cred_getuid(p->p_cred) || 215 kauth_cred_geteuid(pc) == kauth_cred_getuid(p->p_cred) || 216 kauth_cred_getuid(pc) == kauth_cred_geteuid(p->p_cred) || 217 kauth_cred_geteuid(pc) == kauth_cred_geteuid(p->p_cred))) 218 return EPERM; 219 } 220 221 lp.sched_priority = 0; 222 return copyout(&lp, SCARG(uap, sp), sizeof(lp)); 223 } 224 225 int 226 linux_sys_sched_setscheduler(cl, v, retval) 227 struct lwp *cl; 228 void *v; 229 register_t *retval; 230 { 231 struct linux_sys_sched_setscheduler_args /* { 232 syscallarg(linux_pid_t) pid; 233 syscallarg(int) policy; 234 syscallarg(cont struct linux_sched_scheduler *) sp; 235 } */ *uap = v; 236 int error; 237 struct linux_sched_param lp; 238 struct proc *p; 239 240 /* 241 * We only check for valid parameters and return afterwards. 242 */ 243 244 if (SCARG(uap, pid) < 0 || SCARG(uap, sp) == NULL) 245 return EINVAL; 246 247 error = copyin(SCARG(uap, sp), &lp, sizeof(lp)); 248 if (error) 249 return error; 250 251 if (SCARG(uap, pid) != 0) { 252 kauth_cred_t pc = cl->l_cred; 253 254 if ((p = pfind(SCARG(uap, pid))) == NULL) 255 return ESRCH; 256 if (!(cl->l_proc == p || 257 kauth_cred_geteuid(pc) == 0 || 258 kauth_cred_getuid(pc) == kauth_cred_getuid(p->p_cred) || 259 kauth_cred_geteuid(pc) == kauth_cred_getuid(p->p_cred) || 260 kauth_cred_getuid(pc) == kauth_cred_geteuid(p->p_cred) || 261 kauth_cred_geteuid(pc) == kauth_cred_geteuid(p->p_cred))) 262 return EPERM; 263 } 264 265 return 0; 266 /* 267 * We can't emulate anything put the default scheduling policy. 268 */ 269 if (SCARG(uap, policy) != LINUX_SCHED_OTHER || lp.sched_priority != 0) 270 return EINVAL; 271 272 return 0; 273 } 274 275 int 276 linux_sys_sched_getscheduler(cl, v, retval) 277 struct lwp *cl; 278 void *v; 279 register_t *retval; 280 { 281 struct linux_sys_sched_getscheduler_args /* { 282 syscallarg(linux_pid_t) pid; 283 } */ *uap = v; 284 struct proc *p; 285 286 *retval = -1; 287 /* 288 * We only check for valid parameters and return afterwards. 289 */ 290 291 if (SCARG(uap, pid) != 0) { 292 kauth_cred_t pc = cl->l_cred; 293 294 if ((p = pfind(SCARG(uap, pid))) == NULL) 295 return ESRCH; 296 if (!(cl->l_proc == p || 297 kauth_cred_geteuid(pc) == 0 || 298 kauth_cred_getuid(pc) == kauth_cred_getuid(p->p_cred) || 299 kauth_cred_geteuid(pc) == kauth_cred_getuid(p->p_cred) || 300 kauth_cred_getuid(pc) == kauth_cred_geteuid(p->p_cred) || 301 kauth_cred_geteuid(pc) == kauth_cred_geteuid(p->p_cred))) 302 return EPERM; 303 } 304 305 /* 306 * We can't emulate anything put the default scheduling policy. 307 */ 308 *retval = LINUX_SCHED_OTHER; 309 return 0; 310 } 311 312 int 313 linux_sys_sched_yield(cl, v, retval) 314 struct lwp *cl; 315 void *v; 316 register_t *retval; 317 { 318 319 yield(); 320 return 0; 321 } 322 323 int 324 linux_sys_sched_get_priority_max(cl, v, retval) 325 struct lwp *cl; 326 void *v; 327 register_t *retval; 328 { 329 struct linux_sys_sched_get_priority_max_args /* { 330 syscallarg(int) policy; 331 } */ *uap = v; 332 333 /* 334 * We can't emulate anything put the default scheduling policy. 335 */ 336 if (SCARG(uap, policy) != LINUX_SCHED_OTHER) { 337 *retval = -1; 338 return EINVAL; 339 } 340 341 *retval = 0; 342 return 0; 343 } 344 345 int 346 linux_sys_sched_get_priority_min(cl, v, retval) 347 struct lwp *cl; 348 void *v; 349 register_t *retval; 350 { 351 struct linux_sys_sched_get_priority_min_args /* { 352 syscallarg(int) policy; 353 } */ *uap = v; 354 355 /* 356 * We can't emulate anything put the default scheduling policy. 357 */ 358 if (SCARG(uap, policy) != LINUX_SCHED_OTHER) { 359 *retval = -1; 360 return EINVAL; 361 } 362 363 *retval = 0; 364 return 0; 365 } 366 367 #ifndef __m68k__ 368 /* Present on everything but m68k */ 369 int 370 linux_sys_exit_group(l, v, retval) 371 struct lwp *l; 372 void *v; 373 register_t *retval; 374 { 375 #ifdef LINUX_NPTL 376 struct linux_sys_exit_group_args /* { 377 syscallarg(int) error_code; 378 } */ *uap = v; 379 struct proc *p = l->l_proc; 380 struct linux_emuldata *led = p->p_emuldata; 381 struct linux_emuldata *e; 382 383 #ifdef DEBUG_LINUX 384 printf("%s:%d, led->s->refs = %d\n", __func__, __LINE__, led->s->refs); 385 #endif 386 /* 387 * The calling thread is supposed to kill all threads 388 * in the same thread group (i.e. all threads created 389 * via clone(2) with CLONE_THREAD flag set). 390 * 391 * If there is only one thread, things are quite simple 392 */ 393 if (led->s->refs == 1) 394 return sys_exit(l, v, retval); 395 396 #ifdef DEBUG_LINUX 397 printf("%s:%d\n", __func__, __LINE__); 398 #endif 399 400 led->s->flags |= LINUX_LES_INEXITGROUP; 401 led->s->xstat = W_EXITCODE(SCARG(uap, error_code), 0); 402 403 /* 404 * Kill all threads in the group. The emulation exit hook takes 405 * care of hiding the zombies and reporting the exit code properly 406 */ 407 LIST_FOREACH(e, &led->s->threads, threads) { 408 if (e->proc == p) 409 continue; 410 411 #ifdef DEBUG_LINUX 412 printf("%s: kill PID %d\n", __func__, e->proc->p_pid); 413 #endif 414 psignal(e->proc, SIGKILL); 415 } 416 417 /* Now, kill ourselves */ 418 psignal(p, SIGKILL); 419 return 0; 420 #else /* LINUX_NPTL */ 421 return sys_exit(l, v, retval); 422 #endif /* LINUX_NPTL */ 423 } 424 #endif /* !__m68k__ */ 425 426 #ifdef LINUX_NPTL 427 int 428 linux_sys_set_tid_address(l, v, retval) 429 struct lwp *l; 430 void *v; 431 register_t *retval; 432 { 433 struct linux_sys_set_tid_address_args /* { 434 syscallarg(int *) tidptr; 435 } */ *uap = v; 436 struct linux_emuldata *led; 437 438 led = (struct linux_emuldata *)l->l_proc->p_emuldata; 439 led->clear_tid = SCARG(uap, tid); 440 441 *retval = l->l_proc->p_pid; 442 443 return 0; 444 } 445 446 /* ARGUSED1 */ 447 int 448 linux_sys_gettid(l, v, retval) 449 struct lwp *l; 450 void *v; 451 register_t *retval; 452 { 453 /* The Linux kernel does it exactly that way */ 454 *retval = l->l_proc->p_pid; 455 return 0; 456 } 457 458 #ifdef LINUX_NPTL 459 /* ARGUSED1 */ 460 int 461 linux_sys_getpid(l, v, retval) 462 struct lwp *l; 463 void *v; 464 register_t *retval; 465 { 466 struct linux_emuldata *led; 467 468 led = l->l_proc->p_emuldata; 469 470 /* The Linux kernel does it exactly that way */ 471 *retval = led->s->group_pid; 472 473 return 0; 474 } 475 476 /* ARGUSED1 */ 477 int 478 linux_sys_getppid(l, v, retval) 479 struct lwp *l; 480 void *v; 481 register_t *retval; 482 { 483 struct proc *p = l->l_proc; 484 struct linux_emuldata *led = p->p_emuldata; 485 struct proc *glp; 486 struct proc *pp; 487 488 /* Find the thread group leader's parent */ 489 if ((glp = pfind(led->s->group_pid)) == NULL) { 490 /* Maybe panic... */ 491 printf("linux_sys_getppid: missing group leader PID %d\n", 492 led->s->group_pid); 493 return -1; 494 } 495 pp = glp->p_pptr; 496 497 /* If this is a Linux process too, return thread group PID */ 498 if (pp->p_emul == p->p_emul) { 499 struct linux_emuldata *pled; 500 501 pled = pp->p_emuldata; 502 *retval = pled->s->group_pid; 503 } else { 504 *retval = pp->p_pid; 505 } 506 507 return 0; 508 } 509 #endif /* LINUX_NPTL */ 510 511 int 512 linux_sys_sched_getaffinity(l, v, retval) 513 struct lwp *l; 514 void *v; 515 register_t *retval; 516 { 517 struct linux_sys_sched_getaffinity_args /* { 518 syscallarg(pid_t) pid; 519 syscallarg(unsigned int) len; 520 syscallarg(unsigned long *) mask; 521 } */ *uap = v; 522 int error; 523 int ret; 524 int ncpu; 525 int name[2]; 526 size_t sz; 527 char *data; 528 int *retp; 529 530 if (SCARG(uap, mask) == NULL) 531 return EINVAL; 532 533 if (SCARG(uap, len) < sizeof(int)) 534 return EINVAL; 535 536 if (pfind(SCARG(uap, pid)) == NULL) 537 return ESRCH; 538 539 /* 540 * return the actual number of CPU, tag all of them as available 541 * The result is a mask, the first CPU being in the least significant 542 * bit. 543 */ 544 name[0] = CTL_HW; 545 name[1] = HW_NCPU; 546 sz = sizeof(ncpu); 547 548 if ((error = old_sysctl(&name[0], 2, &ncpu, &sz, NULL, 0, NULL)) != 0) 549 return error; 550 551 ret = (1 << ncpu) - 1; 552 553 data = malloc(SCARG(uap, len), M_TEMP, M_WAITOK|M_ZERO); 554 retp = (int *)&data[SCARG(uap, len) - sizeof(ret)]; 555 *retp = ret; 556 557 if ((error = copyout(data, SCARG(uap, mask), SCARG(uap, len))) != 0) 558 return error; 559 560 free(data, M_TEMP); 561 562 return 0; 563 564 } 565 566 int 567 linux_sys_sched_setaffinity(l, v, retval) 568 struct lwp *l; 569 void *v; 570 register_t *retval; 571 { 572 struct linux_sys_sched_setaffinity_args /* { 573 syscallarg(pid_t) pid; 574 syscallarg(unsigned int) len; 575 syscallarg(unsigned long *) mask; 576 } */ *uap = v; 577 578 if (pfind(SCARG(uap, pid)) == NULL) 579 return ESRCH; 580 581 /* Let's ignore it */ 582 #ifdef DEBUG_LINUX 583 printf("linux_sys_sched_setaffinity\n"); 584 #endif 585 return 0; 586 }; 587 #endif /* LINUX_NPTL */ 588
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