rump.c revision 1.159
1 /* $NetBSD: rump.c,v 1.159 2010/04/12 22:17:23 pooka Exp $ */ 2 3 /* 4 * Copyright (c) 2007 Antti Kantee. All Rights Reserved. 5 * 6 * Development of this software was supported by Google Summer of Code. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 18 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 20 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __KERNEL_RCSID(0, "$NetBSD: rump.c,v 1.159 2010/04/12 22:17:23 pooka Exp $"); 32 33 #include <sys/param.h> 34 #include <sys/atomic.h> 35 #include <sys/buf.h> 36 #include <sys/callout.h> 37 #include <sys/conf.h> 38 #include <sys/cpu.h> 39 #include <sys/device.h> 40 #include <sys/evcnt.h> 41 #include <sys/event.h> 42 #include <sys/exec_elf.h> 43 #include <sys/filedesc.h> 44 #include <sys/iostat.h> 45 #include <sys/kauth.h> 46 #include <sys/kernel.h> 47 #include <sys/kmem.h> 48 #include <sys/kprintf.h> 49 #include <sys/ksyms.h> 50 #include <sys/msgbuf.h> 51 #include <sys/module.h> 52 #include <sys/once.h> 53 #include <sys/percpu.h> 54 #include <sys/pipe.h> 55 #include <sys/queue.h> 56 #include <sys/reboot.h> 57 #include <sys/resourcevar.h> 58 #include <sys/select.h> 59 #include <sys/sysctl.h> 60 #include <sys/syscall.h> 61 #include <sys/tty.h> 62 #include <sys/uidinfo.h> 63 #include <sys/vmem.h> 64 #include <sys/xcall.h> 65 66 #include <rump/rumpuser.h> 67 68 #include <secmodel/suser/suser.h> 69 70 #include <prop/proplib.h> 71 72 #include <uvm/uvm_readahead.h> 73 74 #include "rump_private.h" 75 #include "rump_net_private.h" 76 #include "rump_vfs_private.h" 77 #include "rump_dev_private.h" 78 79 struct proc proc0; 80 struct session rump_session = { 81 .s_count = 1, 82 .s_flags = 0, 83 .s_leader = &proc0, 84 .s_login = "rumphobo", 85 .s_sid = 0, 86 }; 87 struct pgrp rump_pgrp = { 88 .pg_members = LIST_HEAD_INITIALIZER(pg_members), 89 .pg_session = &rump_session, 90 .pg_jobc = 1, 91 }; 92 struct pstats rump_stats; 93 struct plimit rump_limits; 94 struct filedesc rump_filedesc0; 95 struct proclist allproc; 96 char machine[] = "rump"; 97 static kauth_cred_t rump_susercred; 98 99 /* pretend the master rump proc is init */ 100 struct proc *initproc = &proc0; 101 102 struct rumpuser_mtx *rump_giantlock; 103 104 sigset_t sigcantmask; 105 106 struct device rump_rootdev = { 107 .dv_class = DV_VIRTUAL 108 }; 109 110 #ifdef RUMP_WITHOUT_THREADS 111 int rump_threads = 0; 112 #else 113 int rump_threads = 1; 114 #endif 115 116 static char rump_msgbuf[16*1024]; /* 16k should be enough for std rump needs */ 117 118 static void 119 rump_aiodone_worker(struct work *wk, void *dummy) 120 { 121 struct buf *bp = (struct buf *)wk; 122 123 KASSERT(&bp->b_work == wk); 124 bp->b_iodone(bp); 125 } 126 127 static int rump_inited; 128 static struct emul emul_rump = { 129 .e_vm_default_addr = uvm_default_mapaddr, 130 }; 131 132 int rump__unavailable(void); 133 int rump__unavailable() {return EOPNOTSUPP;} 134 __weak_alias(rump_net_init,rump__unavailable); 135 __weak_alias(rump_vfs_init,rump__unavailable); 136 __weak_alias(rump_dev_init,rump__unavailable); 137 138 __weak_alias(rump_vfs_fini,rump__unavailable); 139 140 __weak_alias(biodone,rump__unavailable); 141 __weak_alias(sopoll,rump__unavailable); 142 143 void rump__unavailable_vfs_panic(void); 144 void rump__unavailable_vfs_panic() {panic("vfs component not available");} 145 __weak_alias(usermount_common_policy,rump__unavailable_vfs_panic); 146 147 rump_proc_vfs_init_fn rump_proc_vfs_init; 148 rump_proc_vfs_release_fn rump_proc_vfs_release; 149 150 static void add_linkedin_modules(const struct modinfo *const *, size_t); 151 152 static void __noinline 153 messthestack(void) 154 { 155 volatile uint32_t mess[64]; 156 uint64_t d1, d2; 157 int i, error; 158 159 for (i = 0; i < 64; i++) { 160 rumpuser_gettime(&d1, &d2, &error); 161 mess[i] = d2; 162 } 163 } 164 165 /* 166 * Create kern.hostname. why only this you ask. well, init_sysctl 167 * is a kitchen sink in need of some gardening. but i want to use 168 * kern.hostname today. 169 */ 170 static void 171 mksysctls(void) 172 { 173 174 sysctl_createv(NULL, 0, NULL, NULL, 175 CTLFLAG_PERMANENT, CTLTYPE_NODE, "kern", NULL, 176 NULL, 0, NULL, 0, CTL_KERN, CTL_EOL); 177 178 /* XXX: setting hostnamelen is missing */ 179 sysctl_createv(NULL, 0, NULL, NULL, 180 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_STRING, "hostname", 181 SYSCTL_DESCR("System hostname"), NULL, 0, 182 &hostname, MAXHOSTNAMELEN, CTL_KERN, KERN_HOSTNAME, CTL_EOL); 183 } 184 185 int 186 rump__init(int rump_version) 187 { 188 char buf[256]; 189 uint64_t sec, nsec; 190 struct proc *p; 191 struct lwp *l; 192 int i; 193 int error; 194 195 /* not reentrant */ 196 if (rump_inited) 197 return 0; 198 else if (rump_inited == -1) 199 panic("rump_init: host process restart required"); 200 else 201 rump_inited = 1; 202 203 if (rumpuser_getenv("RUMP_VERBOSE", buf, sizeof(buf), &error) == 0) { 204 if (*buf != '0') 205 boothowto = AB_VERBOSE; 206 } 207 208 rumpuser_gettime(&sec, &nsec, &error); 209 boottime.tv_sec = sec; 210 boottime.tv_nsec = nsec; 211 212 initmsgbuf(rump_msgbuf, sizeof(rump_msgbuf)); 213 aprint_verbose("%s%s", copyright, version); 214 215 /* 216 * Seed arc4random() with a "reasonable" amount of randomness. 217 * Yes, this is a quick kludge which depends on the arc4random 218 * implementation. 219 */ 220 messthestack(); 221 arc4random(); 222 223 if (rump_version != RUMP_VERSION) { 224 printf("rump version mismatch, %d vs. %d\n", 225 rump_version, RUMP_VERSION); 226 return EPROGMISMATCH; 227 } 228 229 if (rumpuser_getenv("RUMP_THREADS", buf, sizeof(buf), &error) == 0) { 230 rump_threads = *buf != '0'; 231 } 232 rumpuser_thrinit(rump_user_schedule, rump_user_unschedule, 233 rump_threads); 234 rump_intr_init(); 235 236 /* init minimal lwp/cpu context */ 237 l = &lwp0; 238 l->l_lid = 1; 239 l->l_cpu = rump_cpu; 240 rumpuser_set_curlwp(l); 241 242 mutex_init(&tty_lock, MUTEX_DEFAULT, IPL_NONE); 243 rumpuser_mutex_recursive_init(&rump_giantlock); 244 ksyms_init(); 245 rumpvm_init(); 246 evcnt_init(); 247 248 once_init(); 249 prop_kern_init(); 250 251 pool_subsystem_init(); 252 kmem_init(); 253 254 uvm_ra_init(); 255 256 mutex_obj_init(); 257 callout_startup(); 258 259 kprintf_init(); 260 loginit(); 261 262 kauth_init(); 263 rump_susercred = rump_cred_create(0, 0, 0, NULL); 264 265 /* init proc0 and rest of lwp0 now that we can allocate memory */ 266 p = &proc0; 267 p->p_stats = &rump_stats; 268 p->p_limit = &rump_limits; 269 p->p_pgrp = &rump_pgrp; 270 p->p_pid = 0; 271 p->p_fd = &rump_filedesc0; 272 p->p_vmspace = &rump_vmspace; 273 p->p_emul = &emul_rump; 274 p->p_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE); 275 l->l_cred = rump_cred_suserget(); 276 l->l_proc = p; 277 LIST_INIT(&allproc); 278 LIST_INSERT_HEAD(&allproc, &proc0, p_list); 279 proc_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE); 280 lwpinit_specificdata(); 281 282 rump_limits.pl_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; 283 rump_limits.pl_rlimit[RLIMIT_NOFILE].rlim_cur = RLIM_INFINITY; 284 rump_limits.pl_rlimit[RLIMIT_SBSIZE].rlim_cur = RLIM_INFINITY; 285 286 rump_scheduler_init(); 287 /* revert temporary context and schedule a real context */ 288 l->l_cpu = NULL; 289 rumpuser_set_curlwp(NULL); 290 rump_schedule(); 291 292 percpu_init(); 293 294 /* we are mostly go. do per-cpu subsystem init */ 295 for (i = 0; i < ncpu; i++) { 296 struct cpu_info *ci = cpu_lookup(i); 297 298 callout_init_cpu(ci); 299 softint_init(ci); 300 xc_init_cpu(ci); 301 pool_cache_cpu_init(ci); 302 selsysinit(ci); 303 percpu_init_cpu(ci); 304 } 305 306 sysctl_init(); 307 kqueue_init(); 308 iostat_init(); 309 uid_init(); 310 fd_sys_init(); 311 module_init(); 312 devsw_init(); 313 pipe_init(); 314 315 rumpuser_dl_bootstrap(add_linkedin_modules, rump_kernelfsym_load); 316 317 /* these do nothing if not present */ 318 rump_vfs_init(); 319 rump_net_init(); 320 rump_dev_init(); 321 cold = 0; 322 323 /* aieeeedondest */ 324 if (rump_threads) { 325 if (workqueue_create(&uvm.aiodone_queue, "aiodoned", 326 rump_aiodone_worker, NULL, 0, 0, WQ_MPSAFE)) 327 panic("aiodoned"); 328 } 329 330 mksysctls(); 331 sysctl_finalize(); 332 333 module_init_class(MODULE_CLASS_ANY); 334 335 rumpuser_gethostname(hostname, MAXHOSTNAMELEN, &error); 336 hostnamelen = strlen(hostname); 337 338 sigemptyset(&sigcantmask); 339 340 lwp0.l_fd = proc0.p_fd = fd_init(&rump_filedesc0); 341 342 if (rump_threads) 343 vmem_rehash_start(); 344 345 rump_unschedule(); 346 347 return 0; 348 } 349 350 /* maybe support sys_reboot some day for remote shutdown */ 351 void 352 rump_reboot(int howto) 353 { 354 355 /* dump means we really take the dive here */ 356 if ((howto & RB_DUMP) || panicstr) { 357 rumpuser_exit(RUMPUSER_PANIC); 358 /*NOTREACHED*/ 359 } 360 361 /* try to sync */ 362 if (!((howto & RB_NOSYNC) || panicstr)) { 363 rump_vfs_fini(); 364 } 365 366 /* your wish is my command */ 367 if (howto & RB_HALT) { 368 for (;;) { 369 uint64_t sec = 5, nsec = 0; 370 int error; 371 372 rumpuser_nanosleep(&sec, &nsec, &error); 373 } 374 } 375 rump_inited = -1; 376 } 377 378 struct uio * 379 rump_uio_setup(void *buf, size_t bufsize, off_t offset, enum rump_uiorw rw) 380 { 381 struct uio *uio; 382 enum uio_rw uiorw; 383 384 switch (rw) { 385 case RUMPUIO_READ: 386 uiorw = UIO_READ; 387 break; 388 case RUMPUIO_WRITE: 389 uiorw = UIO_WRITE; 390 break; 391 default: 392 panic("%s: invalid rw %d", __func__, rw); 393 } 394 395 uio = kmem_alloc(sizeof(struct uio), KM_SLEEP); 396 uio->uio_iov = kmem_alloc(sizeof(struct iovec), KM_SLEEP); 397 398 uio->uio_iov->iov_base = buf; 399 uio->uio_iov->iov_len = bufsize; 400 401 uio->uio_iovcnt = 1; 402 uio->uio_offset = offset; 403 uio->uio_resid = bufsize; 404 uio->uio_rw = uiorw; 405 uio->uio_vmspace = UIO_VMSPACE_SYS; 406 407 return uio; 408 } 409 410 size_t 411 rump_uio_getresid(struct uio *uio) 412 { 413 414 return uio->uio_resid; 415 } 416 417 off_t 418 rump_uio_getoff(struct uio *uio) 419 { 420 421 return uio->uio_offset; 422 } 423 424 size_t 425 rump_uio_free(struct uio *uio) 426 { 427 size_t resid; 428 429 resid = uio->uio_resid; 430 kmem_free(uio->uio_iov, sizeof(*uio->uio_iov)); 431 kmem_free(uio, sizeof(*uio)); 432 433 return resid; 434 } 435 436 static pid_t nextpid = 1; 437 struct lwp * 438 rump_newproc_switch() 439 { 440 struct lwp *l; 441 pid_t mypid; 442 443 mypid = atomic_inc_uint_nv(&nextpid); 444 if (__predict_false(mypid == 0)) 445 mypid = atomic_inc_uint_nv(&nextpid); 446 447 l = rump_lwp_alloc(mypid, 0); 448 rump_lwp_switch(l); 449 450 return l; 451 } 452 453 struct lwp * 454 rump_lwp_alloc_and_switch(pid_t pid, lwpid_t lid) 455 { 456 struct lwp *l; 457 458 l = rump_lwp_alloc(pid, lid); 459 rump_lwp_switch(l); 460 461 return l; 462 } 463 464 struct lwp * 465 rump_lwp_alloc(pid_t pid, lwpid_t lid) 466 { 467 struct lwp *l; 468 struct proc *p; 469 470 l = kmem_zalloc(sizeof(*l), KM_SLEEP); 471 if (pid != 0) { 472 p = kmem_zalloc(sizeof(*p), KM_SLEEP); 473 if (rump_proc_vfs_init) 474 rump_proc_vfs_init(p); 475 p->p_stats = &rump_stats; 476 p->p_limit = &rump_limits; 477 p->p_pid = pid; 478 p->p_vmspace = &rump_vmspace; 479 p->p_emul = &emul_rump; 480 p->p_fd = fd_init(NULL); 481 p->p_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE); 482 l->l_cred = rump_cred_suserget(); 483 } else { 484 p = &proc0; 485 l->l_cred = rump_susercred; 486 } 487 488 l->l_proc = p; 489 l->l_lid = lid; 490 l->l_fd = p->p_fd; 491 l->l_cpu = NULL; 492 lwp_initspecific(l); 493 494 return l; 495 } 496 497 void 498 rump_lwp_switch(struct lwp *newlwp) 499 { 500 struct lwp *l = curlwp; 501 502 rumpuser_set_curlwp(NULL); 503 newlwp->l_cpu = l->l_cpu; 504 newlwp->l_mutex = l->l_mutex; 505 l->l_mutex = NULL; 506 l->l_cpu = NULL; 507 rumpuser_set_curlwp(newlwp); 508 if (l->l_flag & LW_WEXIT) 509 rump_lwp_free(l); 510 } 511 512 /* XXX: this has effect only on non-pid0 lwps */ 513 void 514 rump_lwp_release(struct lwp *l) 515 { 516 struct proc *p; 517 518 p = l->l_proc; 519 if (p->p_pid != 0) { 520 mutex_obj_free(p->p_lock); 521 fd_free(); 522 if (rump_proc_vfs_release) 523 rump_proc_vfs_release(p); 524 rump_cred_put(l->l_cred); 525 kmem_free(p, sizeof(*p)); 526 } 527 KASSERT((l->l_flag & LW_WEXIT) == 0); 528 l->l_flag |= LW_WEXIT; 529 } 530 531 void 532 rump_lwp_free(struct lwp *l) 533 { 534 535 KASSERT(l->l_flag & LW_WEXIT); 536 KASSERT(l->l_mutex == NULL); 537 if (l->l_name) 538 kmem_free(l->l_name, MAXCOMLEN); 539 lwp_finispecific(l); 540 kmem_free(l, sizeof(*l)); 541 } 542 543 struct lwp * 544 rump_lwp_curlwp(void) 545 { 546 struct lwp *l = curlwp; 547 548 if (l->l_flag & LW_WEXIT) 549 return NULL; 550 return l; 551 } 552 553 /* rump private. NEEDS WORK! */ 554 void 555 rump_set_vmspace(struct vmspace *vm) 556 { 557 struct proc *p = curproc; 558 559 p->p_vmspace = vm; 560 } 561 562 kauth_cred_t 563 rump_cred_create(uid_t uid, gid_t gid, size_t ngroups, gid_t *groups) 564 { 565 kauth_cred_t cred; 566 int rv; 567 568 cred = kauth_cred_alloc(); 569 kauth_cred_setuid(cred, uid); 570 kauth_cred_seteuid(cred, uid); 571 kauth_cred_setsvuid(cred, uid); 572 kauth_cred_setgid(cred, gid); 573 kauth_cred_setgid(cred, gid); 574 kauth_cred_setegid(cred, gid); 575 kauth_cred_setsvgid(cred, gid); 576 rv = kauth_cred_setgroups(cred, groups, ngroups, 0, UIO_SYSSPACE); 577 /* oh this is silly. and by "this" I mean kauth_cred_setgroups() */ 578 assert(rv == 0); 579 580 return cred; 581 } 582 583 void 584 rump_cred_put(kauth_cred_t cred) 585 { 586 587 kauth_cred_free(cred); 588 } 589 590 kauth_cred_t 591 rump_cred_suserget(void) 592 { 593 594 kauth_cred_hold(rump_susercred); 595 return rump_susercred; 596 } 597 598 /* 599 * Return the next system lwpid 600 */ 601 lwpid_t 602 rump_nextlid(void) 603 { 604 lwpid_t retid; 605 606 mutex_enter(proc0.p_lock); 607 /* 608 * Take next one, don't return 0 609 * XXX: most likely we'll have collisions in case this 610 * wraps around. 611 */ 612 if (++proc0.p_nlwpid == 0) 613 ++proc0.p_nlwpid; 614 retid = proc0.p_nlwpid; 615 mutex_exit(proc0.p_lock); 616 617 return retid; 618 } 619 620 static int compcounter[RUMP_COMPONENT_MAX]; 621 622 static void 623 rump_component_init_cb(struct rump_component *rc, int type) 624 { 625 626 KASSERT(type < RUMP_COMPONENT_MAX); 627 if (rc->rc_type == type) { 628 rc->rc_init(); 629 compcounter[type]++; 630 } 631 } 632 633 int 634 rump_component_count(enum rump_component_type type) 635 { 636 637 KASSERT(type <= RUMP_COMPONENT_MAX); 638 return compcounter[type]; 639 } 640 641 void 642 rump_component_init(enum rump_component_type type) 643 { 644 645 rumpuser_dl_component_init(type, rump_component_init_cb); 646 } 647 648 /* 649 * Initialize a module which has already been loaded and linked 650 * with dlopen(). This is fundamentally the same as a builtin module. 651 */ 652 int 653 rump_module_init(const struct modinfo * const *mip, size_t nmodinfo) 654 { 655 656 return module_builtin_add(mip, nmodinfo, true); 657 } 658 659 /* 660 * Finish module (flawless victory, fatality!). 661 */ 662 int 663 rump_module_fini(const struct modinfo *mi) 664 { 665 666 return module_builtin_remove(mi, true); 667 } 668 669 /* 670 * Add loaded and linked module to the builtin list. It will 671 * later be initialized with module_init_class(). 672 */ 673 674 static void 675 add_linkedin_modules(const struct modinfo * const *mip, size_t nmodinfo) 676 { 677 678 module_builtin_add(mip, nmodinfo, false); 679 } 680 681 int 682 rump_kernelfsym_load(void *symtab, uint64_t symsize, 683 char *strtab, uint64_t strsize) 684 { 685 static int inited = 0; 686 Elf64_Ehdr ehdr; 687 688 if (inited) 689 return EBUSY; 690 inited = 1; 691 692 /* 693 * Use 64bit header since it's bigger. Shouldn't make a 694 * difference, since we're passing in all zeroes anyway. 695 */ 696 memset(&ehdr, 0, sizeof(ehdr)); 697 ksyms_addsyms_explicit(&ehdr, symtab, symsize, strtab, strsize); 698 699 return 0; 700 } 701 702 static int 703 rump_sysproxy_local(int num, void *arg, uint8_t *data, size_t dlen, 704 register_t *retval) 705 { 706 struct lwp *l; 707 struct sysent *callp; 708 int rv; 709 710 if (__predict_false(num >= SYS_NSYSENT)) 711 return ENOSYS; 712 713 callp = rump_sysent + num; 714 rump_schedule(); 715 l = curlwp; 716 rv = callp->sy_call(l, (void *)data, retval); 717 rump_unschedule(); 718 719 return rv; 720 } 721 722 int 723 rump_boot_gethowto() 724 { 725 726 return boothowto; 727 } 728 729 void 730 rump_boot_sethowto(int howto) 731 { 732 733 boothowto = howto; 734 } 735 736 rump_sysproxy_t rump_sysproxy = rump_sysproxy_local; 737 void *rump_sysproxy_arg; 738 739 /* 740 * This whole syscall-via-rpc is still taking form. For example, it 741 * may be necessary to set syscalls individually instead of lobbing 742 * them all to the same place. So don't think this interface is 743 * set in stone. 744 */ 745 int 746 rump_sysproxy_set(rump_sysproxy_t proxy, void *arg) 747 { 748 749 if (rump_sysproxy_arg) 750 return EBUSY; 751 752 rump_sysproxy_arg = arg; 753 rump_sysproxy = proxy; 754 755 return 0; 756 } 757 758 int 759 rump_getversion(void) 760 { 761 762 return __NetBSD_Version__; 763 } 764
Indexes created Tue Sep 30 06:09:59 GMT 2025