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rump.c revision 1.123 
      1 /*	$NetBSD: rump.c,v 1.123 2009/10/14 18:18:53 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 1.123 2009/10/14 18:18:53 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/evcnt.h>
     40 #include <sys/event.h>
     41 #include <sys/filedesc.h>
     42 #include <sys/iostat.h>
     43 #include <sys/kauth.h>
     44 #include <sys/kernel.h>
     45 #include <sys/kmem.h>
     46 #include <sys/kprintf.h>
     47 #include <sys/ksyms.h>
     48 #include <sys/msgbuf.h>
     49 #include <sys/module.h>
     50 #include <sys/once.h>
     51 #include <sys/percpu.h>
     52 #include <sys/queue.h>
     53 #include <sys/reboot.h>
     54 #include <sys/resourcevar.h>
     55 #include <sys/select.h>
     56 #include <sys/sysctl.h>
     57 #include <sys/syscall.h>
     58 #include <sys/tty.h>
     59 #include <sys/uidinfo.h>
     60 #include <sys/vmem.h>
     61 
     62 #include <rump/rumpuser.h>
     63 
     64 #include <secmodel/suser/suser.h>
     65 
     66 #include <prop/proplib.h>
     67 
     68 #include "rump_private.h"
     69 #include "rump_net_private.h"
     70 #include "rump_vfs_private.h"
     71 #include "rump_dev_private.h"
     72 
     73 struct proc proc0;
     74 struct session rump_session = {
     75 	.s_count = 1,
     76 	.s_flags = 0,
     77 	.s_leader = &proc0,
     78 	.s_login = "rumphobo",
     79 	.s_sid = 0,
     80 };
     81 struct pgrp rump_pgrp = {
     82 	.pg_members = LIST_HEAD_INITIALIZER(pg_members),
     83 	.pg_session = &rump_session,
     84 	.pg_jobc = 1,
     85 };
     86 struct pstats rump_stats;
     87 struct plimit rump_limits;
     88 struct cpu_info rump_cpu;
     89 struct filedesc rump_filedesc0;
     90 struct proclist allproc;
     91 char machine[] = "rump";
     92 static kauth_cred_t rump_susercred;
     93 
     94 /* pretend the master rump proc is init */
     95 struct proc *initproc = &proc0;
     96 
     97 struct rumpuser_mtx *rump_giantlock;
     98 
     99 sigset_t sigcantmask;
    100 
    101 #ifdef RUMP_WITHOUT_THREADS
    102 int rump_threads = 0;
    103 #else
    104 int rump_threads = 1;
    105 #endif
    106 
    107 static void
    108 rump_aiodone_worker(struct work *wk, void *dummy)
    109 {
    110 	struct buf *bp = (struct buf *)wk;
    111 
    112 	KASSERT(&bp->b_work == wk);
    113 	bp->b_iodone(bp);
    114 }
    115 
    116 static int rump_inited;
    117 static struct emul emul_rump;
    118 
    119 void rump__unavailable(void);
    120 void rump__unavailable() {}
    121 __weak_alias(rump_net_init,rump__unavailable);
    122 __weak_alias(rump_vfs_init,rump__unavailable);
    123 __weak_alias(rump_dev_init,rump__unavailable);
    124 
    125 __weak_alias(rump_vfs_fini,rump__unavailable);
    126 
    127 __weak_alias(biodone,rump__unavailable);
    128 
    129 void rump__unavailable_vfs_panic(void);
    130 void rump__unavailable_vfs_panic() {panic("vfs component not available");}
    131 __weak_alias(vn_open,rump__unavailable_vfs_panic);
    132 __weak_alias(vn_rdwr,rump__unavailable_vfs_panic);
    133 __weak_alias(vn_stat,rump__unavailable_vfs_panic);
    134 __weak_alias(vn_close,rump__unavailable_vfs_panic);
    135 __weak_alias(namei,rump__unavailable_vfs_panic);
    136 
    137 static void
    138 pvfsinit_nop(struct proc *p)
    139 {
    140 
    141 	return;
    142 }
    143 
    144 static void
    145 pvfsrele_nop(struct proc *p)
    146 {
    147 
    148 	return;
    149 }
    150 
    151 rump_proc_vfs_init_fn rump_proc_vfs_init = pvfsinit_nop;
    152 rump_proc_vfs_release_fn rump_proc_vfs_release = pvfsrele_nop;
    153 
    154 /*
    155  * Stir up the stack a bit.  These are exported functions to help
    156  * convince the compiler that we don't want these routines completely
    157  * optimized out or inlined.  Is there an easier way to do this?
    158  */
    159 void nullfn(uint32_t *);
    160 void nullfn(uint32_t *arg){}
    161 void messthestack(void);
    162 void
    163 messthestack(void)
    164 {
    165 	uint32_t mess[64];
    166 	uint64_t d1, d2;
    167 	int i, error;
    168 
    169 	for (i = 0; i < 64; i++) {
    170 		rumpuser_gettime(&d1, &d2, &error);
    171 		mess[i] = d2;
    172 	}
    173 	nullfn(mess);
    174 }
    175 
    176 int
    177 rump__init(int rump_version)
    178 {
    179 	char buf[256];
    180 	struct proc *p;
    181 	struct lwp *l;
    182 	int error;
    183 
    184 	/* not reentrant */
    185 	if (rump_inited)
    186 		return 0;
    187 	else if (rump_inited == -1)
    188 		panic("rump_init: host process restart required");
    189 	else
    190 		rump_inited = 1;
    191 
    192 	/*
    193 	 * Seed arc4random() with a "reasonable" amount of randomness.
    194 	 * Yes, this is a quick kludge which depends on the arc4random
    195 	 * implementation.
    196 	 */
    197 	messthestack();
    198 	arc4random();
    199 
    200 	if (rump_version != RUMP_VERSION) {
    201 		printf("rump version mismatch, %d vs. %d\n",
    202 		    rump_version, RUMP_VERSION);
    203 		return EPROGMISMATCH;
    204 	}
    205 
    206 	if (rumpuser_getenv("RUMP_THREADS", buf, sizeof(buf), &error) == 0) {
    207 		rump_threads = *buf != '0';
    208 	}
    209 	rumpuser_thrinit(_kernel_lock, _kernel_unlock, rump_threads);
    210 
    211 	mutex_init(&tty_lock, MUTEX_DEFAULT, IPL_NONE);
    212 	rumpuser_mutex_recursive_init(&rump_giantlock);
    213 	ksyms_init();
    214 	rumpvm_init();
    215 	evcnt_init();
    216 
    217 	once_init();
    218 	prop_kern_init();
    219 
    220 	rump_sleepers_init();
    221 
    222 	pool_subsystem_init();
    223 	kmem_init();
    224 
    225 	kprintf_init();
    226 	loginit();
    227 
    228 	kauth_init();
    229 	rump_susercred = rump_cred_create(0, 0, 0, NULL);
    230 
    231 	l = &lwp0;
    232 	p = &proc0;
    233 	p->p_stats = &rump_stats;
    234 	p->p_limit = &rump_limits;
    235 	p->p_pgrp = &rump_pgrp;
    236 	p->p_pid = 0;
    237 	p->p_fd = &rump_filedesc0;
    238 	p->p_vmspace = &rump_vmspace;
    239 	p->p_emul = &emul_rump;
    240 	p->p_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
    241 	l->l_cred = rump_cred_suserget();
    242 	l->l_proc = p;
    243 	l->l_lid = 1;
    244 	l->l_cpu = &rump_cpu;
    245 	LIST_INIT(&allproc);
    246 	LIST_INSERT_HEAD(&allproc, &proc0, p_list);
    247 	proc_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
    248 
    249 	rump_limits.pl_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
    250 	rump_limits.pl_rlimit[RLIMIT_NOFILE].rlim_cur = RLIM_INFINITY;
    251 	rump_limits.pl_rlimit[RLIMIT_SBSIZE].rlim_cur = RLIM_INFINITY;
    252 
    253 	callout_startup();
    254 	callout_init_cpu(&rump_cpu);
    255 
    256 	sysctl_init();
    257 	kqueue_init();
    258 	iostat_init();
    259 	uid_init();
    260 	percpu_init();
    261 	fd_sys_init();
    262 	module_init();
    263 	softint_init(&rump_cpu);
    264 	devsw_init();
    265 
    266 	/* these do nothing if not present */
    267 	rump_vfs_init();
    268 	rump_net_init();
    269 	rump_dev_init();
    270 	cold = 0;
    271 
    272 	/* aieeeedondest */
    273 	if (rump_threads) {
    274 		if (workqueue_create(&uvm.aiodone_queue, "aiodoned",
    275 		    rump_aiodone_worker, NULL, 0, 0, WQ_MPSAFE))
    276 			panic("aiodoned");
    277 	}
    278 
    279 	sysctl_finalize();
    280 
    281 	rumpuser_gethostname(hostname, MAXHOSTNAMELEN, &error);
    282 	hostnamelen = strlen(hostname);
    283 
    284 	sigemptyset(&sigcantmask);
    285 
    286 	lwp0.l_fd = proc0.p_fd = fd_init(&rump_filedesc0);
    287 
    288 #ifdef RUMP_USE_REAL_ALLOCATORS
    289 	if (rump_threads)
    290 		vmem_rehash_start();
    291 #endif
    292 
    293 	rumpuser_dl_module_bootstrap();
    294 
    295 	return 0;
    296 }
    297 
    298 /* maybe support sys_reboot some day for remote shutdown */
    299 void
    300 rump_reboot(int howto)
    301 {
    302 
    303 	/* dump means we really take the dive here */
    304 	if ((howto & RB_DUMP) || panicstr) {
    305 		rumpuser_exit(RUMPUSER_PANIC);
    306 		/*NOTREACHED*/
    307 	}
    308 
    309 	/* try to sync */
    310 	if (!((howto & RB_NOSYNC) || panicstr)) {
    311 		rump_vfs_fini();
    312 	}
    313 
    314 	/* your wish is my command */
    315 	if (howto & RB_HALT) {
    316 		for (;;) {
    317 			uint64_t sec = 5, nsec = 0;
    318 			int error;
    319 
    320 			rumpuser_nanosleep(&sec, &nsec, &error);
    321 		}
    322 	}
    323 	rump_inited = -1;
    324 }
    325 
    326 struct uio *
    327 rump_uio_setup(void *buf, size_t bufsize, off_t offset, enum rump_uiorw rw)
    328 {
    329 	struct uio *uio;
    330 	enum uio_rw uiorw;
    331 
    332 	switch (rw) {
    333 	case RUMPUIO_READ:
    334 		uiorw = UIO_READ;
    335 		break;
    336 	case RUMPUIO_WRITE:
    337 		uiorw = UIO_WRITE;
    338 		break;
    339 	default:
    340 		panic("%s: invalid rw %d", __func__, rw);
    341 	}
    342 
    343 	uio = kmem_alloc(sizeof(struct uio), KM_SLEEP);
    344 	uio->uio_iov = kmem_alloc(sizeof(struct iovec), KM_SLEEP);
    345 
    346 	uio->uio_iov->iov_base = buf;
    347 	uio->uio_iov->iov_len = bufsize;
    348 
    349 	uio->uio_iovcnt = 1;
    350 	uio->uio_offset = offset;
    351 	uio->uio_resid = bufsize;
    352 	uio->uio_rw = uiorw;
    353 	uio->uio_vmspace = UIO_VMSPACE_SYS;
    354 
    355 	return uio;
    356 }
    357 
    358 size_t
    359 rump_uio_getresid(struct uio *uio)
    360 {
    361 
    362 	return uio->uio_resid;
    363 }
    364 
    365 off_t
    366 rump_uio_getoff(struct uio *uio)
    367 {
    368 
    369 	return uio->uio_offset;
    370 }
    371 
    372 size_t
    373 rump_uio_free(struct uio *uio)
    374 {
    375 	size_t resid;
    376 
    377 	resid = uio->uio_resid;
    378 	kmem_free(uio->uio_iov, sizeof(*uio->uio_iov));
    379 	kmem_free(uio, sizeof(*uio));
    380 
    381 	return resid;
    382 }
    383 
    384 /* public interface */
    385 static pid_t nextpid = 1;
    386 struct lwp *
    387 rump_newproc_switch()
    388 {
    389 	struct lwp *oldlwp = curlwp;
    390 	pid_t mypid;
    391 
    392 	mypid = atomic_inc_uint_nv(&nextpid);
    393 	if (__predict_false(mypid == 0))
    394 		mypid = atomic_inc_uint_nv(&nextpid);
    395 
    396 	rumpuser_set_curlwp(NULL);
    397 	rump_setup_curlwp(mypid, 0, 1);
    398 
    399 	return oldlwp;
    400 }
    401 
    402 /* rump private */
    403 struct lwp *
    404 rump_setup_curlwp(pid_t pid, lwpid_t lid, int set)
    405 {
    406 	struct lwp *l;
    407 	struct proc *p;
    408 
    409 	l = kmem_zalloc(sizeof(struct lwp), KM_SLEEP);
    410 	if (pid != 0) {
    411 		p = kmem_zalloc(sizeof(struct proc), KM_SLEEP);
    412 		rump_proc_vfs_init(p);
    413 		p->p_stats = &rump_stats;
    414 		p->p_limit = &rump_limits;
    415 		p->p_pid = pid;
    416 		p->p_vmspace = &rump_vmspace;
    417 		p->p_fd = fd_init(NULL);
    418 		p->p_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
    419 	} else {
    420 		p = &proc0;
    421 	}
    422 
    423 	l->l_cred = rump_cred_suserget();
    424 	l->l_proc = p;
    425 	l->l_lid = lid;
    426 	l->l_fd = p->p_fd;
    427 	l->l_mutex = RUMP_LMUTEX_MAGIC;
    428 	l->l_cpu = &rump_cpu;
    429 
    430 	if (set)
    431 		rumpuser_set_curlwp(l);
    432 
    433 	return l;
    434 }
    435 
    436 /* rump private.  NEEDS WORK! */
    437 void
    438 rump_set_vmspace(struct vmspace *vm)
    439 {
    440 	struct proc *p = curproc;
    441 
    442 	p->p_vmspace = vm;
    443 }
    444 
    445 void
    446 rump_clear_curlwp(void)
    447 {
    448 	struct lwp *l;
    449 	struct proc *p;
    450 
    451 	l = rumpuser_get_curlwp();
    452 	p = l->l_proc;
    453 	if (p->p_pid != 0) {
    454 		mutex_obj_free(p->p_lock);
    455 		fd_free();
    456 		rump_proc_vfs_release(p);
    457 		rump_cred_put(l->l_cred);
    458 		kmem_free(p, sizeof(*p));
    459 	}
    460 	kmem_free(l, sizeof(*l));
    461 	rumpuser_set_curlwp(NULL);
    462 }
    463 
    464 struct lwp *
    465 rump_get_curlwp(void)
    466 {
    467 	struct lwp *l;
    468 
    469 	l = rumpuser_get_curlwp();
    470 	if (l == NULL)
    471 		l = &lwp0;
    472 
    473 	return l;
    474 }
    475 
    476 void
    477 rump_set_curlwp(struct lwp *l)
    478 {
    479 
    480 	/* clear current */
    481 	rumpuser_set_curlwp(NULL);
    482 	/* set new */
    483 	rumpuser_set_curlwp(l);
    484 }
    485 
    486 kauth_cred_t
    487 rump_cred_create(uid_t uid, gid_t gid, size_t ngroups, gid_t *groups)
    488 {
    489 	kauth_cred_t cred;
    490 	int rv;
    491 
    492 	cred = kauth_cred_alloc();
    493 	kauth_cred_setuid(cred, uid);
    494 	kauth_cred_seteuid(cred, uid);
    495 	kauth_cred_setsvuid(cred, uid);
    496 	kauth_cred_setgid(cred, gid);
    497 	kauth_cred_setgid(cred, gid);
    498 	kauth_cred_setegid(cred, gid);
    499 	kauth_cred_setsvgid(cred, gid);
    500 	rv = kauth_cred_setgroups(cred, groups, ngroups, 0, UIO_SYSSPACE);
    501 	/* oh this is silly.  and by "this" I mean kauth_cred_setgroups() */
    502 	assert(rv == 0);
    503 
    504 	return cred;
    505 }
    506 
    507 void
    508 rump_cred_put(kauth_cred_t cred)
    509 {
    510 
    511 	kauth_cred_free(cred);
    512 }
    513 
    514 kauth_cred_t
    515 rump_cred_suserget(void)
    516 {
    517 
    518 	kauth_cred_hold(rump_susercred);
    519 	return rump_susercred;
    520 }
    521 
    522 /*
    523  * Return the next system lwpid
    524  */
    525 lwpid_t
    526 rump_nextlid(void)
    527 {
    528 	lwpid_t retid;
    529 
    530 	mutex_enter(proc0.p_lock);
    531 	/*
    532 	 * Take next one, don't return 0
    533 	 * XXX: most likely we'll have collisions in case this
    534 	 * wraps around.
    535 	 */
    536 	if (++proc0.p_nlwpid == 0)
    537 		++proc0.p_nlwpid;
    538 	retid = proc0.p_nlwpid;
    539 	mutex_exit(proc0.p_lock);
    540 
    541 	return retid;
    542 }
    543 
    544 int
    545 rump_module_init(struct modinfo *mi, prop_dictionary_t props)
    546 {
    547 	int rv;
    548 
    549 	if (!module_compatible(mi->mi_version, __NetBSD_Version__))
    550 		return EPROGMISMATCH;
    551 
    552 	rv = mi->mi_modcmd(MODULE_CMD_INIT, props);
    553 	if (rv == 0 && mi->mi_class == MODULE_CLASS_SECMODEL)
    554 		secmodel_register();
    555 
    556 	return rv;
    557 }
    558 
    559 int
    560 rump_module_fini(struct modinfo *mi)
    561 {
    562 	int rv;
    563 
    564 	rv = mi->mi_modcmd(MODULE_CMD_FINI, NULL);
    565 	if (rv == 0 && mi->mi_class == MODULE_CLASS_SECMODEL)
    566 		secmodel_deregister();
    567 
    568 	return rv;
    569 }
    570 
    571 static int
    572 rump_sysproxy_local(int num, void *arg, uint8_t *data, size_t dlen,
    573 	register_t *retval)
    574 {
    575 	struct lwp *l;
    576 	struct sysent *callp;
    577 
    578 	if (__predict_false(num >= SYS_NSYSENT))
    579 		return ENOSYS;
    580 
    581 	l = curlwp;
    582 	callp = rump_sysent + num;
    583 	return callp->sy_call(l, (void *)data, retval);
    584 }
    585 
    586 rump_sysproxy_t rump_sysproxy = rump_sysproxy_local;
    587 void *rump_sysproxy_arg;
    588 
    589 /*
    590  * This whole syscall-via-rpc is still taking form.  For example, it
    591  * may be necessary to set syscalls individually instead of lobbing
    592  * them all to the same place.  So don't think this interface is
    593  * set in stone.
    594  */
    595 int
    596 rump_sysproxy_set(rump_sysproxy_t proxy, void *arg)
    597 {
    598 
    599 	if (rump_sysproxy_arg)
    600 		return EBUSY;
    601 
    602 	rump_sysproxy_arg = arg;
    603 	rump_sysproxy = proxy;
    604 
    605 	return 0;
    606 }
    607 
    608 int
    609 rump_getversion()
    610 {
    611 
    612 	return __NetBSD_Version__;
    613 }
    614