1 /*-
2 * Copyright (c) 2004 Tim J. Robbins
3 * Copyright (c) 2002 Doug Rabson
4 * Copyright (c) 2000 Marcel Moolenaar
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer
12 * in this position and unchanged.
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 OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD: releng/11.1/sys/compat/linux/linux_fork.c 301961 2016-06-16 12:05:44Z kib $");
31
32 #include "opt_compat.h"
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/imgact.h>
37 #include <sys/ktr.h>
38 #include <sys/lock.h>
39 #include <sys/mutex.h>
40 #include <sys/proc.h>
41 #include <sys/racct.h>
42 #include <sys/sched.h>
43 #include <sys/syscallsubr.h>
44 #include <sys/sx.h>
45 #include <sys/umtx.h>
46 #include <sys/unistd.h>
47 #include <sys/wait.h>
48
49 #include <vm/vm.h>
50 #include <vm/pmap.h>
51 #include <vm/vm_map.h>
52
53 #ifdef COMPAT_LINUX32
54 #include <machine/../linux32/linux.h>
55 #include <machine/../linux32/linux32_proto.h>
56 #else
57 #include <machine/../linux/linux.h>
58 #include <machine/../linux/linux_proto.h>
59 #endif
60 #include <compat/linux/linux_emul.h>
61 #include <compat/linux/linux_futex.h>
62 #include <compat/linux/linux_misc.h>
63 #include <compat/linux/linux_util.h>
64
65 int
66 linux_fork(struct thread *td, struct linux_fork_args *args)
67 {
68 struct fork_req fr;
69 int error;
70 struct proc *p2;
71 struct thread *td2;
72
73 #ifdef DEBUG
74 if (ldebug(fork))
75 printf(ARGS(fork, ""));
76 #endif
77
78 bzero(&fr, sizeof(fr));
79 fr.fr_flags = RFFDG | RFPROC | RFSTOPPED;
80 fr.fr_procp = &p2;
81 if ((error = fork1(td, &fr)) != 0)
82 return (error);
83
84 td2 = FIRST_THREAD_IN_PROC(p2);
85
86 linux_proc_init(td, td2, 0);
87
88 td->td_retval[0] = p2->p_pid;
89
90 /*
91 * Make this runnable after we are finished with it.
92 */
93 thread_lock(td2);
94 TD_SET_CAN_RUN(td2);
95 sched_add(td2, SRQ_BORING);
96 thread_unlock(td2);
97
98 return (0);
99 }
100
101 int
102 linux_vfork(struct thread *td, struct linux_vfork_args *args)
103 {
104 struct fork_req fr;
105 int error;
106 struct proc *p2;
107 struct thread *td2;
108
109 #ifdef DEBUG
110 if (ldebug(vfork))
111 printf(ARGS(vfork, ""));
112 #endif
113
114 bzero(&fr, sizeof(fr));
115 fr.fr_flags = RFFDG | RFPROC | RFMEM | RFPPWAIT | RFSTOPPED;
116 fr.fr_procp = &p2;
117 if ((error = fork1(td, &fr)) != 0)
118 return (error);
119
120 td2 = FIRST_THREAD_IN_PROC(p2);
121
122 linux_proc_init(td, td2, 0);
123
124 td->td_retval[0] = p2->p_pid;
125
126 /*
127 * Make this runnable after we are finished with it.
128 */
129 thread_lock(td2);
130 TD_SET_CAN_RUN(td2);
131 sched_add(td2, SRQ_BORING);
132 thread_unlock(td2);
133
134 return (0);
135 }
136
137 static int
138 linux_clone_proc(struct thread *td, struct linux_clone_args *args)
139 {
140 struct fork_req fr;
141 int error, ff = RFPROC | RFSTOPPED;
142 struct proc *p2;
143 struct thread *td2;
144 int exit_signal;
145 struct linux_emuldata *em;
146
147 #ifdef DEBUG
148 if (ldebug(clone)) {
149 printf(ARGS(clone, "flags %x, stack %p, parent tid: %p, "
150 "child tid: %p"), (unsigned)args->flags,
151 args->stack, args->parent_tidptr, args->child_tidptr);
152 }
153 #endif
154
155 exit_signal = args->flags & 0x000000ff;
156 if (LINUX_SIG_VALID(exit_signal)) {
157 exit_signal = linux_to_bsd_signal(exit_signal);
158 } else if (exit_signal != 0)
159 return (EINVAL);
160
161 if (args->flags & LINUX_CLONE_VM)
162 ff |= RFMEM;
163 if (args->flags & LINUX_CLONE_SIGHAND)
164 ff |= RFSIGSHARE;
165 /*
166 * XXX: In Linux, sharing of fs info (chroot/cwd/umask)
167 * and open files is independent. In FreeBSD, its in one
168 * structure but in reality it does not cause any problems
169 * because both of these flags are usually set together.
170 */
171 if (!(args->flags & (LINUX_CLONE_FILES | LINUX_CLONE_FS)))
172 ff |= RFFDG;
173
174 if (args->flags & LINUX_CLONE_PARENT_SETTID)
175 if (args->parent_tidptr == NULL)
176 return (EINVAL);
177
178 if (args->flags & LINUX_CLONE_VFORK)
179 ff |= RFPPWAIT;
180
181 bzero(&fr, sizeof(fr));
182 fr.fr_flags = ff;
183 fr.fr_procp = &p2;
184 error = fork1(td, &fr);
185 if (error)
186 return (error);
187
188 td2 = FIRST_THREAD_IN_PROC(p2);
189
190 /* create the emuldata */
191 linux_proc_init(td, td2, args->flags);
192
193 em = em_find(td2);
194 KASSERT(em != NULL, ("clone_proc: emuldata not found.\n"));
195
196 if (args->flags & LINUX_CLONE_CHILD_SETTID)
197 em->child_set_tid = args->child_tidptr;
198 else
199 em->child_set_tid = NULL;
200
201 if (args->flags & LINUX_CLONE_CHILD_CLEARTID)
202 em->child_clear_tid = args->child_tidptr;
203 else
204 em->child_clear_tid = NULL;
205
206 if (args->flags & LINUX_CLONE_PARENT_SETTID) {
207 error = copyout(&p2->p_pid, args->parent_tidptr,
208 sizeof(p2->p_pid));
209 if (error)
210 printf(LMSG("copyout failed!"));
211 }
212
213 PROC_LOCK(p2);
214 p2->p_sigparent = exit_signal;
215 PROC_UNLOCK(p2);
216 /*
217 * In a case of stack = NULL, we are supposed to COW calling process
218 * stack. This is what normal fork() does, so we just keep tf_rsp arg
219 * intact.
220 */
221 linux_set_upcall_kse(td2, PTROUT(args->stack));
222
223 if (args->flags & LINUX_CLONE_SETTLS)
224 linux_set_cloned_tls(td2, args->tls);
225
226 /*
227 * If CLONE_PARENT is set, then the parent of the new process will be
228 * the same as that of the calling process.
229 */
230 if (args->flags & LINUX_CLONE_PARENT) {
231 sx_xlock(&proctree_lock);
232 PROC_LOCK(p2);
233 proc_reparent(p2, td->td_proc->p_pptr);
234 PROC_UNLOCK(p2);
235 sx_xunlock(&proctree_lock);
236 }
237
238 #ifdef DEBUG
239 if (ldebug(clone))
240 printf(LMSG("clone: successful rfork to %d, "
241 "stack %p sig = %d"), (int)p2->p_pid, args->stack,
242 exit_signal);
243 #endif
244
245 /*
246 * Make this runnable after we are finished with it.
247 */
248 thread_lock(td2);
249 TD_SET_CAN_RUN(td2);
250 sched_add(td2, SRQ_BORING);
251 thread_unlock(td2);
252
253 td->td_retval[0] = p2->p_pid;
254
255 return (0);
256 }
257
258 static int
259 linux_clone_thread(struct thread *td, struct linux_clone_args *args)
260 {
261 struct linux_emuldata *em;
262 struct thread *newtd;
263 struct proc *p;
264 int error;
265
266 #ifdef DEBUG
267 if (ldebug(clone)) {
268 printf(ARGS(clone, "thread: flags %x, stack %p, parent tid: %p, "
269 "child tid: %p"), (unsigned)args->flags,
270 args->stack, args->parent_tidptr, args->child_tidptr);
271 }
272 #endif
273
274 LINUX_CTR4(clone_thread, "thread(%d) flags %x ptid %p ctid %p",
275 td->td_tid, (unsigned)args->flags,
276 args->parent_tidptr, args->child_tidptr);
277
278 if (args->flags & LINUX_CLONE_PARENT_SETTID)
279 if (args->parent_tidptr == NULL)
280 return (EINVAL);
281
282 /* Threads should be created with own stack */
283 if (args->stack == NULL)
284 return (EINVAL);
285
286 p = td->td_proc;
287
288 #ifdef RACCT
289 if (racct_enable) {
290 PROC_LOCK(p);
291 error = racct_add(p, RACCT_NTHR, 1);
292 PROC_UNLOCK(p);
293 if (error != 0)
294 return (EPROCLIM);
295 }
296 #endif
297
298 /* Initialize our td */
299 error = kern_thr_alloc(p, 0, &newtd);
300 if (error)
301 goto fail;
302
303 cpu_copy_thread(newtd, td);
304
305 bzero(&newtd->td_startzero,
306 __rangeof(struct thread, td_startzero, td_endzero));
307 bcopy(&td->td_startcopy, &newtd->td_startcopy,
308 __rangeof(struct thread, td_startcopy, td_endcopy));
309
310 newtd->td_proc = p;
311 thread_cow_get(newtd, td);
312
313 /* create the emuldata */
314 linux_proc_init(td, newtd, args->flags);
315
316 em = em_find(newtd);
317 KASSERT(em != NULL, ("clone_thread: emuldata not found.\n"));
318
319 if (args->flags & LINUX_CLONE_SETTLS)
320 linux_set_cloned_tls(newtd, args->tls);
321
322 if (args->flags & LINUX_CLONE_CHILD_SETTID)
323 em->child_set_tid = args->child_tidptr;
324 else
325 em->child_set_tid = NULL;
326
327 if (args->flags & LINUX_CLONE_CHILD_CLEARTID)
328 em->child_clear_tid = args->child_tidptr;
329 else
330 em->child_clear_tid = NULL;
331
332 cpu_thread_clean(newtd);
333
334 linux_set_upcall_kse(newtd, PTROUT(args->stack));
335
336 PROC_LOCK(p);
337 p->p_flag |= P_HADTHREADS;
338 bcopy(p->p_comm, newtd->td_name, sizeof(newtd->td_name));
339
340 if (args->flags & LINUX_CLONE_PARENT)
341 thread_link(newtd, p->p_pptr);
342 else
343 thread_link(newtd, p);
344
345 thread_lock(td);
346 /* let the scheduler know about these things. */
347 sched_fork_thread(td, newtd);
348 thread_unlock(td);
349 if (P_SHOULDSTOP(p))
350 newtd->td_flags |= TDF_ASTPENDING | TDF_NEEDSUSPCHK;
351 PROC_UNLOCK(p);
352
353 tidhash_add(newtd);
354
355 #ifdef DEBUG
356 if (ldebug(clone))
357 printf(ARGS(clone, "successful clone to %d, stack %p"),
358 (int)newtd->td_tid, args->stack);
359 #endif
360
361 LINUX_CTR2(clone_thread, "thread(%d) successful clone to %d",
362 td->td_tid, newtd->td_tid);
363
364 if (args->flags & LINUX_CLONE_PARENT_SETTID) {
365 error = copyout(&newtd->td_tid, args->parent_tidptr,
366 sizeof(newtd->td_tid));
367 if (error)
368 printf(LMSG("clone_thread: copyout failed!"));
369 }
370
371 /*
372 * Make this runnable after we are finished with it.
373 */
374 thread_lock(newtd);
375 TD_SET_CAN_RUN(newtd);
376 sched_add(newtd, SRQ_BORING);
377 thread_unlock(newtd);
378
379 td->td_retval[0] = newtd->td_tid;
380
381 return (0);
382
383 fail:
384 #ifdef RACCT
385 if (racct_enable) {
386 PROC_LOCK(p);
387 racct_sub(p, RACCT_NTHR, 1);
388 PROC_UNLOCK(p);
389 }
390 #endif
391 return (error);
392 }
393
394 int
395 linux_clone(struct thread *td, struct linux_clone_args *args)
396 {
397
398 if (args->flags & LINUX_CLONE_THREAD)
399 return (linux_clone_thread(td, args));
400 else
401 return (linux_clone_proc(td, args));
402 }
403
404 int
405 linux_exit(struct thread *td, struct linux_exit_args *args)
406 {
407 struct linux_emuldata *em;
408
409 em = em_find(td);
410 KASSERT(em != NULL, ("exit: emuldata not found.\n"));
411
412 LINUX_CTR2(exit, "thread(%d) (%d)", em->em_tid, args->rval);
413
414 umtx_thread_exit(td);
415
416 linux_thread_detach(td);
417
418 /*
419 * XXX. When the last two threads of a process
420 * exit via pthread_exit() try thr_exit() first.
421 */
422 kern_thr_exit(td);
423 exit1(td, args->rval, 0);
424 /* NOTREACHED */
425 }
426
427 int
428 linux_set_tid_address(struct thread *td, struct linux_set_tid_address_args *args)
429 {
430 struct linux_emuldata *em;
431
432 em = em_find(td);
433 KASSERT(em != NULL, ("set_tid_address: emuldata not found.\n"));
434
435 em->child_clear_tid = args->tidptr;
436
437 td->td_retval[0] = em->em_tid;
438
439 LINUX_CTR3(set_tid_address, "tidptr(%d) %p, returns %d",
440 em->em_tid, args->tidptr, td->td_retval[0]);
441
442 return (0);
443 }
444
445 void
446 linux_thread_detach(struct thread *td)
447 {
448 struct linux_sys_futex_args cup;
449 struct linux_emuldata *em;
450 int *child_clear_tid;
451 int error;
452
453 em = em_find(td);
454 KASSERT(em != NULL, ("thread_detach: emuldata not found.\n"));
455
456 LINUX_CTR1(thread_detach, "thread(%d)", em->em_tid);
457
458 release_futexes(td, em);
459
460 child_clear_tid = em->child_clear_tid;
461
462 if (child_clear_tid != NULL) {
463
464 LINUX_CTR2(thread_detach, "thread(%d) %p",
465 em->em_tid, child_clear_tid);
466
467 error = suword32(child_clear_tid, 0);
468 if (error != 0)
469 return;
470
471 cup.uaddr = child_clear_tid;
472 cup.op = LINUX_FUTEX_WAKE;
473 cup.val = 1; /* wake one */
474 cup.timeout = NULL;
475 cup.uaddr2 = NULL;
476 cup.val3 = 0;
477 error = linux_sys_futex(td, &cup);
478 /*
479 * this cannot happen at the moment and if this happens it
480 * probably means there is a user space bug
481 */
482 if (error != 0)
483 linux_msg(td, "futex stuff in thread_detach failed.");
484 }
485 }
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