2 * Copyright (c) 2014 John Baldwin
3 * Copyright (c) 2014, 2016 The FreeBSD Foundation
5 * Portions of this software were developed by Konstantin Belousov
6 * under sponsorship from the FreeBSD Foundation.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE 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
23 * OR 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
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/capsicum.h>
37 #include <sys/mutex.h>
40 #include <sys/procctl.h>
42 #include <sys/syscallsubr.h>
43 #include <sys/sysproto.h>
48 #include <vm/vm_map.h>
49 #include <vm/vm_extern.h>
52 protect_setchild(struct thread *td, struct proc *p, int flags)
55 PROC_LOCK_ASSERT(p, MA_OWNED);
56 if (p->p_flag & P_SYSTEM || p_cansched(td, p) != 0)
58 if (flags & PPROT_SET) {
59 p->p_flag |= P_PROTECTED;
60 if (flags & PPROT_INHERIT)
61 p->p_flag2 |= P2_INHERIT_PROTECTED;
63 p->p_flag &= ~P_PROTECTED;
64 p->p_flag2 &= ~P2_INHERIT_PROTECTED;
70 protect_setchildren(struct thread *td, struct proc *top, int flags)
77 sx_assert(&proctree_lock, SX_LOCKED);
79 ret |= protect_setchild(td, p, flags);
82 * If this process has children, descend to them next,
83 * otherwise do any siblings, and if done with this level,
84 * follow back up the tree (but not past top).
86 if (!LIST_EMPTY(&p->p_children))
87 p = LIST_FIRST(&p->p_children);
93 if (LIST_NEXT(p, p_sibling)) {
94 p = LIST_NEXT(p, p_sibling);
104 protect_set(struct thread *td, struct proc *p, int flags)
108 switch (PPROT_OP(flags)) {
116 if ((PPROT_FLAGS(flags) & ~(PPROT_DESCEND | PPROT_INHERIT)) != 0)
119 error = priv_check(td, PRIV_VM_MADV_PROTECT);
123 if (flags & PPROT_DESCEND)
124 ret = protect_setchildren(td, p, flags);
126 ret = protect_setchild(td, p, flags);
133 reap_acquire(struct thread *td, struct proc *p)
136 sx_assert(&proctree_lock, SX_XLOCKED);
139 if ((p->p_treeflag & P_TREE_REAPER) != 0)
141 p->p_treeflag |= P_TREE_REAPER;
143 * We do not reattach existing children and the whole tree
144 * under them to us, since p->p_reaper already seen them.
150 reap_release(struct thread *td, struct proc *p)
153 sx_assert(&proctree_lock, SX_XLOCKED);
158 if ((p->p_treeflag & P_TREE_REAPER) == 0)
160 reaper_abandon_children(p, false);
165 reap_status(struct thread *td, struct proc *p,
166 struct procctl_reaper_status *rs)
168 struct proc *reap, *p2, *first_p;
170 sx_assert(&proctree_lock, SX_LOCKED);
171 bzero(rs, sizeof(*rs));
172 if ((p->p_treeflag & P_TREE_REAPER) == 0) {
176 rs->rs_flags |= REAPER_STATUS_OWNED;
178 if (reap == initproc)
179 rs->rs_flags |= REAPER_STATUS_REALINIT;
180 rs->rs_reaper = reap->p_pid;
181 rs->rs_descendants = 0;
183 if (!LIST_EMPTY(&reap->p_reaplist)) {
184 first_p = LIST_FIRST(&reap->p_children);
186 first_p = LIST_FIRST(&reap->p_reaplist);
187 rs->rs_pid = first_p->p_pid;
188 LIST_FOREACH(p2, &reap->p_reaplist, p_reapsibling) {
189 if (proc_realparent(p2) == reap)
191 rs->rs_descendants++;
200 reap_getpids(struct thread *td, struct proc *p, struct procctl_reaper_pids *rp)
202 struct proc *reap, *p2;
203 struct procctl_reaper_pidinfo *pi, *pip;
207 sx_assert(&proctree_lock, SX_LOCKED);
209 reap = (p->p_treeflag & P_TREE_REAPER) == 0 ? p->p_reaper : p;
212 LIST_FOREACH(p2, &reap->p_reaplist, p_reapsibling)
214 sx_unlock(&proctree_lock);
215 if (rp->rp_count < n)
217 pi = malloc(n * sizeof(*pi), M_TEMP, M_WAITOK);
218 sx_slock(&proctree_lock);
219 LIST_FOREACH(p2, &reap->p_reaplist, p_reapsibling) {
223 bzero(pip, sizeof(*pip));
224 pip->pi_pid = p2->p_pid;
225 pip->pi_subtree = p2->p_reapsubtree;
226 pip->pi_flags = REAPER_PIDINFO_VALID;
227 if (proc_realparent(p2) == reap)
228 pip->pi_flags |= REAPER_PIDINFO_CHILD;
229 if ((p2->p_treeflag & P_TREE_REAPER) != 0)
230 pip->pi_flags |= REAPER_PIDINFO_REAPER;
233 sx_sunlock(&proctree_lock);
234 error = copyout(pi, rp->rp_pids, i * sizeof(*pi));
236 sx_slock(&proctree_lock);
242 reap_kill_proc(struct thread *td, struct proc *p2, ksiginfo_t *ksi,
243 struct procctl_reaper_kill *rk, int *error)
248 error1 = p_cansignal(td, p2, rk->rk_sig);
250 pksignal(p2, rk->rk_sig, ksi);
253 } else if (*error == ESRCH) {
254 rk->rk_fpid = p2->p_pid;
260 struct reap_kill_tracker {
262 TAILQ_ENTRY(reap_kill_tracker) link;
265 TAILQ_HEAD(reap_kill_tracker_head, reap_kill_tracker);
268 reap_kill_sched(struct reap_kill_tracker_head *tracker, struct proc *p2)
270 struct reap_kill_tracker *t;
272 t = malloc(sizeof(struct reap_kill_tracker), M_TEMP, M_WAITOK);
274 TAILQ_INSERT_TAIL(tracker, t, link);
278 reap_kill(struct thread *td, struct proc *p, struct procctl_reaper_kill *rk)
280 struct proc *reap, *p2;
282 struct reap_kill_tracker_head tracker;
283 struct reap_kill_tracker *t;
286 sx_assert(&proctree_lock, SX_LOCKED);
287 if (IN_CAPABILITY_MODE(td))
289 if (rk->rk_sig <= 0 || rk->rk_sig > _SIG_MAXSIG ||
290 (rk->rk_flags & ~(REAPER_KILL_CHILDREN |
291 REAPER_KILL_SUBTREE)) != 0 || (rk->rk_flags &
292 (REAPER_KILL_CHILDREN | REAPER_KILL_SUBTREE)) ==
293 (REAPER_KILL_CHILDREN | REAPER_KILL_SUBTREE))
296 reap = (p->p_treeflag & P_TREE_REAPER) == 0 ? p->p_reaper : p;
298 ksi.ksi_signo = rk->rk_sig;
299 ksi.ksi_code = SI_USER;
300 ksi.ksi_pid = td->td_proc->p_pid;
301 ksi.ksi_uid = td->td_ucred->cr_ruid;
305 if ((rk->rk_flags & REAPER_KILL_CHILDREN) != 0) {
306 for (p2 = LIST_FIRST(&reap->p_children); p2 != NULL;
307 p2 = LIST_NEXT(p2, p_sibling)) {
308 reap_kill_proc(td, p2, &ksi, rk, &error);
310 * Do not end the loop on error, signal
315 TAILQ_INIT(&tracker);
316 reap_kill_sched(&tracker, reap);
317 while ((t = TAILQ_FIRST(&tracker)) != NULL) {
318 MPASS((t->parent->p_treeflag & P_TREE_REAPER) != 0);
319 TAILQ_REMOVE(&tracker, t, link);
320 for (p2 = LIST_FIRST(&t->parent->p_reaplist); p2 != NULL;
321 p2 = LIST_NEXT(p2, p_reapsibling)) {
322 if (t->parent == reap &&
323 (rk->rk_flags & REAPER_KILL_SUBTREE) != 0 &&
324 p2->p_reapsubtree != rk->rk_subtree)
326 if ((p2->p_treeflag & P_TREE_REAPER) != 0)
327 reap_kill_sched(&tracker, p2);
328 reap_kill_proc(td, p2, &ksi, rk, &error);
338 trace_ctl(struct thread *td, struct proc *p, int state)
341 PROC_LOCK_ASSERT(p, MA_OWNED);
344 * Ktrace changes p_traceflag from or to zero under the
345 * process lock, so the test does not need to acquire ktrace
348 if ((p->p_flag & P_TRACED) != 0 || p->p_traceflag != 0)
352 case PROC_TRACE_CTL_ENABLE:
353 if (td->td_proc != p)
355 p->p_flag2 &= ~(P2_NOTRACE | P2_NOTRACE_EXEC);
357 case PROC_TRACE_CTL_DISABLE_EXEC:
358 p->p_flag2 |= P2_NOTRACE_EXEC | P2_NOTRACE;
360 case PROC_TRACE_CTL_DISABLE:
361 if ((p->p_flag2 & P2_NOTRACE_EXEC) != 0) {
362 KASSERT((p->p_flag2 & P2_NOTRACE) != 0,
363 ("dandling P2_NOTRACE_EXEC"));
364 if (td->td_proc != p)
366 p->p_flag2 &= ~P2_NOTRACE_EXEC;
368 p->p_flag2 |= P2_NOTRACE;
378 trace_status(struct thread *td, struct proc *p, int *data)
381 if ((p->p_flag2 & P2_NOTRACE) != 0) {
382 KASSERT((p->p_flag & P_TRACED) == 0,
383 ("%d traced but tracing disabled", p->p_pid));
385 } else if ((p->p_flag & P_TRACED) != 0) {
386 *data = p->p_pptr->p_pid;
394 trapcap_ctl(struct thread *td, struct proc *p, int state)
397 PROC_LOCK_ASSERT(p, MA_OWNED);
400 case PROC_TRAPCAP_CTL_ENABLE:
401 p->p_flag2 |= P2_TRAPCAP;
403 case PROC_TRAPCAP_CTL_DISABLE:
404 p->p_flag2 &= ~P2_TRAPCAP;
413 trapcap_status(struct thread *td, struct proc *p, int *data)
416 *data = (p->p_flag2 & P2_TRAPCAP) != 0 ? PROC_TRAPCAP_CTL_ENABLE :
417 PROC_TRAPCAP_CTL_DISABLE;
422 aslr_ctl(struct thread *td, struct proc *p, int state)
425 PROC_LOCK_ASSERT(p, MA_OWNED);
428 case PROC_ASLR_FORCE_ENABLE:
429 p->p_flag2 &= ~P2_ASLR_DISABLE;
430 p->p_flag2 |= P2_ASLR_ENABLE;
432 case PROC_ASLR_FORCE_DISABLE:
433 p->p_flag2 |= P2_ASLR_DISABLE;
434 p->p_flag2 &= ~P2_ASLR_ENABLE;
436 case PROC_ASLR_NOFORCE:
437 p->p_flag2 &= ~(P2_ASLR_ENABLE | P2_ASLR_DISABLE);
446 aslr_status(struct thread *td, struct proc *p, int *data)
451 switch (p->p_flag2 & (P2_ASLR_ENABLE | P2_ASLR_DISABLE)) {
453 d = PROC_ASLR_NOFORCE;
456 d = PROC_ASLR_FORCE_ENABLE;
458 case P2_ASLR_DISABLE:
459 d = PROC_ASLR_FORCE_DISABLE;
462 if ((p->p_flag & P_WEXIT) == 0) {
465 vm = vmspace_acquire_ref(p);
466 if (vm != NULL && (vm->vm_map.flags & MAP_ASLR) != 0) {
467 d |= PROC_ASLR_ACTIVE;
478 stackgap_ctl(struct thread *td, struct proc *p, int state)
480 PROC_LOCK_ASSERT(p, MA_OWNED);
482 if ((state & ~(PROC_STACKGAP_ENABLE | PROC_STACKGAP_DISABLE |
483 PROC_STACKGAP_ENABLE_EXEC | PROC_STACKGAP_DISABLE_EXEC)) != 0)
485 switch (state & (PROC_STACKGAP_ENABLE | PROC_STACKGAP_DISABLE)) {
486 case PROC_STACKGAP_ENABLE:
487 if ((p->p_flag2 & P2_STKGAP_DISABLE) != 0)
490 case PROC_STACKGAP_DISABLE:
491 p->p_flag2 |= P2_STKGAP_DISABLE;
498 switch (state & (PROC_STACKGAP_ENABLE_EXEC |
499 PROC_STACKGAP_DISABLE_EXEC)) {
500 case PROC_STACKGAP_ENABLE_EXEC:
501 p->p_flag2 &= ~P2_STKGAP_DISABLE_EXEC;
503 case PROC_STACKGAP_DISABLE_EXEC:
504 p->p_flag2 |= P2_STKGAP_DISABLE_EXEC;
515 stackgap_status(struct thread *td, struct proc *p, int *data)
517 PROC_LOCK_ASSERT(p, MA_OWNED);
519 *data = (p->p_flag2 & P2_STKGAP_DISABLE) != 0 ? PROC_STACKGAP_DISABLE :
520 PROC_STACKGAP_ENABLE;
521 *data |= (p->p_flag2 & P2_STKGAP_DISABLE_EXEC) != 0 ?
522 PROC_STACKGAP_DISABLE_EXEC : PROC_STACKGAP_ENABLE_EXEC;
526 #ifndef _SYS_SYSPROTO_H_
527 struct procctl_args {
536 sys_procctl(struct thread *td, struct procctl_args *uap)
540 struct procctl_reaper_status rs;
541 struct procctl_reaper_pids rp;
542 struct procctl_reaper_kill rk;
544 int error, error1, flags, signum;
546 if (uap->com >= PROC_PROCCTL_MD_MIN)
547 return (cpu_procctl(td, uap->idtype, uap->id,
548 uap->com, uap->data));
553 case PROC_STACKGAP_CTL:
555 case PROC_TRAPCAP_CTL:
556 error = copyin(uap->data, &flags, sizeof(flags));
561 case PROC_REAP_ACQUIRE:
562 case PROC_REAP_RELEASE:
563 if (uap->data != NULL)
567 case PROC_REAP_STATUS:
570 case PROC_REAP_GETPIDS:
571 error = copyin(uap->data, &x.rp, sizeof(x.rp));
577 error = copyin(uap->data, &x.rk, sizeof(x.rk));
582 case PROC_ASLR_STATUS:
583 case PROC_STACKGAP_STATUS:
584 case PROC_TRACE_STATUS:
585 case PROC_TRAPCAP_STATUS:
588 case PROC_PDEATHSIG_CTL:
589 error = copyin(uap->data, &signum, sizeof(signum));
594 case PROC_PDEATHSIG_STATUS:
600 error = kern_procctl(td, uap->idtype, uap->id, uap->com, data);
602 case PROC_REAP_STATUS:
604 error = copyout(&x.rs, uap->data, sizeof(x.rs));
607 error1 = copyout(&x.rk, uap->data, sizeof(x.rk));
611 case PROC_ASLR_STATUS:
612 case PROC_STACKGAP_STATUS:
613 case PROC_TRACE_STATUS:
614 case PROC_TRAPCAP_STATUS:
616 error = copyout(&flags, uap->data, sizeof(flags));
618 case PROC_PDEATHSIG_STATUS:
620 error = copyout(&signum, uap->data, sizeof(signum));
627 kern_procctl_single(struct thread *td, struct proc *p, int com, void *data)
630 PROC_LOCK_ASSERT(p, MA_OWNED);
633 return (aslr_ctl(td, p, *(int *)data));
634 case PROC_ASLR_STATUS:
635 return (aslr_status(td, p, data));
637 return (protect_set(td, p, *(int *)data));
638 case PROC_STACKGAP_CTL:
639 return (stackgap_ctl(td, p, *(int *)data));
640 case PROC_STACKGAP_STATUS:
641 return (stackgap_status(td, p, data));
642 case PROC_REAP_ACQUIRE:
643 return (reap_acquire(td, p));
644 case PROC_REAP_RELEASE:
645 return (reap_release(td, p));
646 case PROC_REAP_STATUS:
647 return (reap_status(td, p, data));
648 case PROC_REAP_GETPIDS:
649 return (reap_getpids(td, p, data));
651 return (reap_kill(td, p, data));
653 return (trace_ctl(td, p, *(int *)data));
654 case PROC_TRACE_STATUS:
655 return (trace_status(td, p, data));
656 case PROC_TRAPCAP_CTL:
657 return (trapcap_ctl(td, p, *(int *)data));
658 case PROC_TRAPCAP_STATUS:
659 return (trapcap_status(td, p, data));
666 kern_procctl(struct thread *td, idtype_t idtype, id_t id, int com, void *data)
670 int error, first_error, ok;
676 case PROC_ASLR_STATUS:
677 case PROC_REAP_ACQUIRE:
678 case PROC_REAP_RELEASE:
679 case PROC_REAP_STATUS:
680 case PROC_REAP_GETPIDS:
682 case PROC_STACKGAP_CTL:
683 case PROC_STACKGAP_STATUS:
684 case PROC_TRACE_STATUS:
685 case PROC_TRAPCAP_STATUS:
686 case PROC_PDEATHSIG_CTL:
687 case PROC_PDEATHSIG_STATUS:
693 case PROC_PDEATHSIG_CTL:
694 signum = *(int *)data;
696 if ((id != 0 && id != p->p_pid) ||
697 (signum != 0 && !_SIG_VALID(signum)))
700 p->p_pdeathsig = signum;
703 case PROC_PDEATHSIG_STATUS:
705 if (id != 0 && id != p->p_pid)
708 *(int *)data = p->p_pdeathsig;
715 case PROC_REAP_STATUS:
716 case PROC_REAP_GETPIDS:
719 case PROC_TRAPCAP_CTL:
720 sx_slock(&proctree_lock);
723 case PROC_REAP_ACQUIRE:
724 case PROC_REAP_RELEASE:
725 sx_xlock(&proctree_lock);
729 case PROC_ASLR_STATUS:
730 case PROC_STACKGAP_CTL:
731 case PROC_STACKGAP_STATUS:
732 case PROC_TRACE_STATUS:
733 case PROC_TRAPCAP_STATUS:
747 error = p_cansee(td, p);
749 error = kern_procctl_single(td, p, com, data);
754 * Attempt to apply the operation to all members of the
755 * group. Ignore processes in the group that can't be
756 * seen. Ignore errors so long as at least one process is
757 * able to complete the request successfully.
767 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
769 if (p->p_state == PRS_NEW || p_cansee(td, p) != 0) {
773 error = kern_procctl_single(td, p, com, data);
777 else if (first_error == 0)
782 else if (first_error != 0)
786 * Was not able to see any processes in the
796 sx_unlock(&proctree_lock);