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8 * modification, are permitted provided that the following conditions
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35 * @(#)kern_proc.c 8.7 (Berkeley) 2/14/95
36 * $FreeBSD: src/sys/kern/kern_proc.c,v 1.63.2.9 2003/05/08 07:47:16 kbyanc Exp $
37 * $DragonFly: src/sys/kern/kern_proc.c,v 1.45 2008/06/12 23:25:02 dillon Exp $
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/kernel.h>
43 #include <sys/sysctl.h>
44 #include <sys/malloc.h>
47 #include <sys/filedesc.h>
49 #include <sys/dsched.h>
50 #include <sys/signalvar.h>
51 #include <sys/spinlock.h>
55 #include <vm/vm_map.h>
57 #include <machine/smp.h>
59 #include <sys/spinlock2.h>
60 #include <sys/mplock2.h>
62 static MALLOC_DEFINE(M_PGRP, "pgrp", "process group header");
63 MALLOC_DEFINE(M_SESSION, "session", "session header");
64 MALLOC_DEFINE(M_PROC, "proc", "Proc structures");
65 MALLOC_DEFINE(M_LWP, "lwp", "lwp structures");
66 MALLOC_DEFINE(M_SUBPROC, "subproc", "Proc sub-structures");
68 int ps_showallprocs = 1;
69 static int ps_showallthreads = 1;
70 SYSCTL_INT(_security, OID_AUTO, ps_showallprocs, CTLFLAG_RW,
72 "Unprivileged processes can see proccesses with different UID/GID");
73 SYSCTL_INT(_security, OID_AUTO, ps_showallthreads, CTLFLAG_RW,
74 &ps_showallthreads, 0,
75 "Unprivileged processes can see kernel threads");
77 static void pgdelete(struct pgrp *);
78 static void orphanpg(struct pgrp *pg);
79 static pid_t proc_getnewpid_locked(int random_offset);
84 struct pidhashhead *pidhashtbl;
86 struct pgrphashhead *pgrphashtbl;
88 struct proclist allproc;
89 struct proclist zombproc;
92 * Random component to nextpid generation. We mix in a random factor to make
93 * it a little harder to predict. We sanity check the modulus value to avoid
94 * doing it in critical paths. Don't let it be too small or we pointlessly
95 * waste randomness entropy, and don't let it be impossibly large. Using a
96 * modulus that is too big causes a LOT more process table scans and slows
97 * down fork processing as the pidchecked caching is defeated.
99 static int randompid = 0;
105 sysctl_kern_randompid(SYSCTL_HANDLER_ARGS)
110 error = sysctl_handle_int(oidp, &pid, 0, req);
111 if (error || !req->newptr)
113 if (pid < 0 || pid > PID_MAX - 100) /* out of range */
115 else if (pid < 2) /* NOP */
117 else if (pid < 100) /* Make it reasonable */
123 SYSCTL_PROC(_kern, OID_AUTO, randompid, CTLTYPE_INT|CTLFLAG_RW,
124 0, 0, sysctl_kern_randompid, "I", "Random PID modulus");
127 * Initialize global process hashing structures.
129 * Called from the low level boot code only.
135 LIST_INIT(&zombproc);
137 pidhashtbl = hashinit(maxproc / 4, M_PROC, &pidhash);
138 pgrphashtbl = hashinit(maxproc / 4, M_PROC, &pgrphash);
143 * Is p an inferior of the current process?
146 * The caller must hold proc_token if the caller wishes a stable result.
149 inferior(struct proc *p)
151 lwkt_gettoken(&proc_token);
152 while (p != curproc) {
154 lwkt_reltoken(&proc_token);
159 lwkt_reltoken(&proc_token);
164 * Locate a process by number
166 * XXX TODO - change API to PHOLD() the returned process ?
169 * The caller must hold proc_token if the caller wishes a stable result.
176 lwkt_gettoken(&proc_token);
177 LIST_FOREACH(p, PIDHASH(pid), p_hash) {
178 if (p->p_pid == pid) {
179 lwkt_reltoken(&proc_token);
183 lwkt_reltoken(&proc_token);
188 * Locate a process group by number
191 * The caller must hold proc_token if the caller wishes a stable result.
198 lwkt_gettoken(&proc_token);
199 LIST_FOREACH(pgrp, PGRPHASH(pgid), pg_hash) {
200 if (pgrp->pg_id == pgid)
203 lwkt_reltoken(&proc_token);
208 * Move p to a new or existing process group (and session)
213 enterpgrp(struct proc *p, pid_t pgid, int mksess)
218 lwkt_gettoken(&proc_token);
221 KASSERT(pgrp == NULL || !mksess,
222 ("enterpgrp: setsid into non-empty pgrp"));
223 KASSERT(!SESS_LEADER(p),
224 ("enterpgrp: session leader attempted setpgrp"));
227 pid_t savepid = p->p_pid;
232 KASSERT(p->p_pid == pgid,
233 ("enterpgrp: new pgrp and pid != pgid"));
234 if ((np = pfind(savepid)) == NULL || np != p) {
238 MALLOC(pgrp, struct pgrp *, sizeof(struct pgrp),
241 struct session *sess;
246 MALLOC(sess, struct session *, sizeof(struct session),
247 M_SESSION, M_WAITOK);
249 sess->s_sid = p->p_pid;
251 sess->s_ttyvp = NULL;
253 bcopy(p->p_session->s_login, sess->s_login,
254 sizeof(sess->s_login));
255 p->p_flag &= ~P_CONTROLT;
256 pgrp->pg_session = sess;
257 KASSERT(p == curproc,
258 ("enterpgrp: mksession and p != curproc"));
260 pgrp->pg_session = p->p_session;
261 sess_hold(pgrp->pg_session);
264 LIST_INIT(&pgrp->pg_members);
265 LIST_INSERT_HEAD(PGRPHASH(pgid), pgrp, pg_hash);
267 SLIST_INIT(&pgrp->pg_sigiolst);
268 lockinit(&pgrp->pg_lock, "pgwt", 0, 0);
269 } else if (pgrp == p->p_pgrp) {
274 * Adjust eligibility of affected pgrps to participate in job control.
275 * Increment eligibility counts before decrementing, otherwise we
276 * could reach 0 spuriously during the first call.
279 fixjobc(p, p->p_pgrp, 0);
281 LIST_REMOVE(p, p_pglist);
282 if (LIST_EMPTY(&p->p_pgrp->pg_members))
285 LIST_INSERT_HEAD(&pgrp->pg_members, p, p_pglist);
289 lwkt_reltoken(&proc_token);
294 * Remove process from process group
299 leavepgrp(struct proc *p)
301 lwkt_gettoken(&proc_token);
302 LIST_REMOVE(p, p_pglist);
303 if (LIST_EMPTY(&p->p_pgrp->pg_members))
306 lwkt_reltoken(&proc_token);
311 * Delete a process group
313 * The caller must hold proc_token.
316 pgdelete(struct pgrp *pgrp)
319 * Reset any sigio structures pointing to us as a result of
320 * F_SETOWN with our pgid.
322 funsetownlst(&pgrp->pg_sigiolst);
324 if (pgrp->pg_session->s_ttyp != NULL &&
325 pgrp->pg_session->s_ttyp->t_pgrp == pgrp)
326 pgrp->pg_session->s_ttyp->t_pgrp = NULL;
327 LIST_REMOVE(pgrp, pg_hash);
328 sess_rele(pgrp->pg_session);
333 * Adjust the ref count on a session structure. When the ref count falls to
334 * zero the tty is disassociated from the session and the session structure
335 * is freed. Note that tty assocation is not itself ref-counted.
340 sess_hold(struct session *sp)
342 lwkt_gettoken(&tty_token);
344 lwkt_reltoken(&tty_token);
351 sess_rele(struct session *sp)
353 KKASSERT(sp->s_count > 0);
354 lwkt_gettoken(&tty_token);
355 if (--sp->s_count == 0) {
356 if (sp->s_ttyp && sp->s_ttyp->t_session) {
357 #ifdef TTY_DO_FULL_CLOSE
358 /* FULL CLOSE, see ttyclearsession() */
359 KKASSERT(sp->s_ttyp->t_session == sp);
360 sp->s_ttyp->t_session = NULL;
362 /* HALF CLOSE, see ttyclearsession() */
363 if (sp->s_ttyp->t_session == sp)
364 sp->s_ttyp->t_session = NULL;
367 kfree(sp, M_SESSION);
369 lwkt_reltoken(&tty_token);
373 * Adjust pgrp jobc counters when specified process changes process group.
374 * We count the number of processes in each process group that "qualify"
375 * the group for terminal job control (those with a parent in a different
376 * process group of the same session). If that count reaches zero, the
377 * process group becomes orphaned. Check both the specified process'
378 * process group and that of its children.
379 * entering == 0 => p is leaving specified group.
380 * entering == 1 => p is entering specified group.
385 fixjobc(struct proc *p, struct pgrp *pgrp, int entering)
387 struct pgrp *hispgrp;
388 struct session *mysession;
391 * Check p's parent to see whether p qualifies its own process
392 * group; if so, adjust count for p's process group.
394 lwkt_gettoken(&proc_token);
395 mysession = pgrp->pg_session;
396 if ((hispgrp = p->p_pptr->p_pgrp) != pgrp &&
397 hispgrp->pg_session == mysession) {
400 else if (--pgrp->pg_jobc == 0)
405 * Check this process' children to see whether they qualify
406 * their process groups; if so, adjust counts for children's
409 LIST_FOREACH(p, &p->p_children, p_sibling) {
410 if ((hispgrp = p->p_pgrp) != pgrp &&
411 hispgrp->pg_session == mysession &&
412 p->p_stat != SZOMB) {
415 else if (--hispgrp->pg_jobc == 0)
419 lwkt_reltoken(&proc_token);
423 * A process group has become orphaned;
424 * if there are any stopped processes in the group,
425 * hang-up all process in that group.
427 * The caller must hold proc_token.
430 orphanpg(struct pgrp *pg)
434 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
435 if (p->p_stat == SSTOP) {
436 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
446 * Add a new process to the allproc list and the PID hash. This
447 * also assigns a pid to the new process.
452 proc_add_allproc(struct proc *p)
456 if ((random_offset = randompid) != 0) {
458 random_offset = karc4random() % random_offset;
462 lwkt_gettoken(&proc_token);
463 p->p_pid = proc_getnewpid_locked(random_offset);
464 LIST_INSERT_HEAD(&allproc, p, p_list);
465 LIST_INSERT_HEAD(PIDHASH(p->p_pid), p, p_hash);
466 lwkt_reltoken(&proc_token);
470 * Calculate a new process pid. This function is integrated into
471 * proc_add_allproc() to guarentee that the new pid is not reused before
472 * the new process can be added to the allproc list.
474 * The caller must hold proc_token.
478 proc_getnewpid_locked(int random_offset)
480 static pid_t nextpid;
481 static pid_t pidchecked;
485 * Find an unused process ID. We remember a range of unused IDs
486 * ready to use (from nextpid+1 through pidchecked-1).
488 nextpid = nextpid + 1 + random_offset;
491 * If the process ID prototype has wrapped around,
492 * restart somewhat above 0, as the low-numbered procs
493 * tend to include daemons that don't exit.
495 if (nextpid >= PID_MAX) {
496 nextpid = nextpid % PID_MAX;
501 if (nextpid >= pidchecked) {
504 pidchecked = PID_MAX;
506 * Scan the active and zombie procs to check whether this pid
507 * is in use. Remember the lowest pid that's greater
508 * than nextpid, so we can avoid checking for a while.
510 p = LIST_FIRST(&allproc);
512 for (; p != 0; p = LIST_NEXT(p, p_list)) {
513 while (p->p_pid == nextpid ||
514 p->p_pgrp->pg_id == nextpid ||
515 p->p_session->s_sid == nextpid) {
517 if (nextpid >= pidchecked)
520 if (p->p_pid > nextpid && pidchecked > p->p_pid)
521 pidchecked = p->p_pid;
522 if (p->p_pgrp->pg_id > nextpid &&
523 pidchecked > p->p_pgrp->pg_id)
524 pidchecked = p->p_pgrp->pg_id;
525 if (p->p_session->s_sid > nextpid &&
526 pidchecked > p->p_session->s_sid)
527 pidchecked = p->p_session->s_sid;
531 p = LIST_FIRST(&zombproc);
539 * Called from exit1 to remove a process from the allproc
540 * list and move it to the zombie list.
545 proc_move_allproc_zombie(struct proc *p)
547 lwkt_gettoken(&proc_token);
549 tsleep(p, 0, "reap1", hz / 10);
551 LIST_REMOVE(p, p_list);
552 LIST_INSERT_HEAD(&zombproc, p, p_list);
553 LIST_REMOVE(p, p_hash);
555 lwkt_reltoken(&proc_token);
560 * This routine is called from kern_wait() and will remove the process
561 * from the zombie list and the sibling list. This routine will block
562 * if someone has a lock on the proces (p_lock).
567 proc_remove_zombie(struct proc *p)
569 lwkt_gettoken(&proc_token);
571 tsleep(p, 0, "reap1", hz / 10);
573 LIST_REMOVE(p, p_list); /* off zombproc */
574 LIST_REMOVE(p, p_sibling);
575 lwkt_reltoken(&proc_token);
579 * Scan all processes on the allproc list. The process is automatically
580 * held for the callback. A return value of -1 terminates the loop.
583 * The callback is made with the process held and proc_token held.
586 allproc_scan(int (*callback)(struct proc *, void *), void *data)
591 lwkt_gettoken(&proc_token);
592 LIST_FOREACH(p, &allproc, p_list) {
594 r = callback(p, data);
599 lwkt_reltoken(&proc_token);
603 * Scan all lwps of processes on the allproc list. The lwp is automatically
604 * held for the callback. A return value of -1 terminates the loop.
607 * The callback is made with the proces and lwp both held, and proc_token held.
610 alllwp_scan(int (*callback)(struct lwp *, void *), void *data)
616 lwkt_gettoken(&proc_token);
617 LIST_FOREACH(p, &allproc, p_list) {
619 FOREACH_LWP_IN_PROC(lp, p) {
621 r = callback(lp, data);
628 lwkt_reltoken(&proc_token);
632 * Scan all processes on the zombproc list. The process is automatically
633 * held for the callback. A return value of -1 terminates the loop.
636 * The callback is made with the proces held and proc_token held.
639 zombproc_scan(int (*callback)(struct proc *, void *), void *data)
644 lwkt_gettoken(&proc_token);
645 LIST_FOREACH(p, &zombproc, p_list) {
647 r = callback(p, data);
652 lwkt_reltoken(&proc_token);
662 DB_SHOW_COMMAND(pgrpdump, pgrpdump)
668 for (i = 0; i <= pgrphash; i++) {
669 if (!LIST_EMPTY(&pgrphashtbl[i])) {
670 kprintf("\tindx %d\n", i);
671 LIST_FOREACH(pgrp, &pgrphashtbl[i], pg_hash) {
673 "\tpgrp %p, pgid %ld, sess %p, sesscnt %d, mem %p\n",
674 (void *)pgrp, (long)pgrp->pg_id,
675 (void *)pgrp->pg_session,
676 pgrp->pg_session->s_count,
677 (void *)LIST_FIRST(&pgrp->pg_members));
678 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
679 kprintf("\t\tpid %ld addr %p pgrp %p\n",
680 (long)p->p_pid, (void *)p,
690 * Locate a process on the zombie list. Return a held process or NULL.
692 * The caller must hold proc_token if a stable result is desired.
693 * No other requirements.
700 lwkt_gettoken(&proc_token);
701 LIST_FOREACH(p, &zombproc, p_list) {
705 lwkt_reltoken(&proc_token);
710 * The caller must hold proc_token.
713 sysctl_out_proc(struct proc *p, struct sysctl_req *req, int flags)
715 struct kinfo_proc ki;
717 int skp = 0, had_output = 0;
720 bzero(&ki, sizeof(ki));
721 fill_kinfo_proc(p, &ki);
722 if ((flags & KERN_PROC_FLAG_LWP) == 0)
725 FOREACH_LWP_IN_PROC(lp, p) {
727 fill_kinfo_lwp(lp, &ki.kp_lwp);
729 error = SYSCTL_OUT(req, &ki, sizeof(ki));
736 /* We need to output at least the proc, even if there is no lwp. */
737 if (had_output == 0) {
738 error = SYSCTL_OUT(req, &ki, sizeof(ki));
744 * The caller must hold proc_token.
747 sysctl_out_proc_kthread(struct thread *td, struct sysctl_req *req, int flags)
749 struct kinfo_proc ki;
752 fill_kinfo_proc_kthread(td, &ki);
753 error = SYSCTL_OUT(req, &ki, sizeof(ki));
763 sysctl_kern_proc(SYSCTL_HANDLER_ARGS)
765 int *name = (int*) arg1;
766 int oid = oidp->oid_number;
767 u_int namelen = arg2;
769 struct proclist *plist;
771 int doingzomb, flags = 0;
775 struct ucred *cr1 = curproc->p_ucred;
777 flags = oid & KERN_PROC_FLAGMASK;
778 oid &= ~KERN_PROC_FLAGMASK;
780 if ((oid == KERN_PROC_ALL && namelen != 0) ||
781 (oid != KERN_PROC_ALL && namelen != 1))
784 lwkt_gettoken(&proc_token);
785 if (oid == KERN_PROC_PID) {
786 p = pfind((pid_t)name[0]);
789 if (!PRISON_CHECK(cr1, p->p_ucred))
792 error = sysctl_out_proc(p, req, flags);
798 /* overestimate by 5 procs */
799 error = SYSCTL_OUT(req, 0, sizeof (struct kinfo_proc) * 5);
803 for (doingzomb = 0; doingzomb <= 1; doingzomb++) {
808 LIST_FOREACH(p, plist, p_list) {
810 * Show a user only their processes.
812 if ((!ps_showallprocs) && p_trespass(cr1, p->p_ucred))
815 * Skip embryonic processes.
817 if (p->p_stat == SIDL)
820 * TODO - make more efficient (see notes below).
825 /* could do this by traversing pgrp */
826 if (p->p_pgrp == NULL ||
827 p->p_pgrp->pg_id != (pid_t)name[0])
832 if ((p->p_flag & P_CONTROLT) == 0 ||
833 p->p_session == NULL ||
834 p->p_session->s_ttyp == NULL ||
835 dev2udev(p->p_session->s_ttyp->t_dev) !=
841 if (p->p_ucred == NULL ||
842 p->p_ucred->cr_uid != (uid_t)name[0])
847 if (p->p_ucred == NULL ||
848 p->p_ucred->cr_ruid != (uid_t)name[0])
853 if (!PRISON_CHECK(cr1, p->p_ucred))
856 error = sysctl_out_proc(p, req, flags);
864 * Iterate over all active cpus and scan their thread list. Start
865 * with the next logical cpu and end with our original cpu. We
866 * migrate our own thread to each target cpu in order to safely scan
867 * its thread list. In the last loop we migrate back to our original
870 origcpu = mycpu->gd_cpuid;
871 if (!ps_showallthreads || jailed(cr1))
874 for (n = 1; n <= ncpus; ++n) {
878 nid = (origcpu + n) % ncpus;
879 if ((smp_active_mask & (1 << nid)) == 0)
881 rgd = globaldata_find(nid);
882 lwkt_setcpu_self(rgd);
884 TAILQ_FOREACH(td, &mycpu->gd_tdallq, td_allq) {
897 error = sysctl_out_proc_kthread(td, req, doingzomb);
904 lwkt_reltoken(&proc_token);
909 * This sysctl allows a process to retrieve the argument list or process
910 * title for another process without groping around in the address space
911 * of the other process. It also allow a process to set its own "process
912 * title to a string of its own choice.
917 sysctl_kern_proc_args(SYSCTL_HANDLER_ARGS)
919 int *name = (int*) arg1;
920 u_int namelen = arg2;
924 struct ucred *cr1 = curproc->p_ucred;
929 lwkt_gettoken(&proc_token);
930 p = pfind((pid_t)name[0]);
934 if ((!ps_argsopen) && p_trespass(cr1, p->p_ucred))
937 if (req->newptr && curproc != p) {
943 if (req->oldptr && p->p_args != NULL) {
944 error = SYSCTL_OUT(req, p->p_args->ar_args,
945 p->p_args->ar_length);
947 if (req->newptr == NULL) {
952 if (p->p_args && --p->p_args->ar_ref == 0)
953 FREE(p->p_args, M_PARGS);
956 if (req->newlen + sizeof(struct pargs) > ps_arg_cache_limit) {
961 MALLOC(pa, struct pargs *, sizeof(struct pargs) + req->newlen,
964 pa->ar_length = req->newlen;
965 error = SYSCTL_IN(req, pa->ar_args, req->newlen);
972 lwkt_reltoken(&proc_token);
976 SYSCTL_NODE(_kern, KERN_PROC, proc, CTLFLAG_RD, 0, "Process table");
978 SYSCTL_PROC(_kern_proc, KERN_PROC_ALL, all, CTLFLAG_RD|CTLTYPE_STRUCT,
979 0, 0, sysctl_kern_proc, "S,proc", "Return entire process table");
981 SYSCTL_NODE(_kern_proc, KERN_PROC_PGRP, pgrp, CTLFLAG_RD,
982 sysctl_kern_proc, "Process table");
984 SYSCTL_NODE(_kern_proc, KERN_PROC_TTY, tty, CTLFLAG_RD,
985 sysctl_kern_proc, "Process table");
987 SYSCTL_NODE(_kern_proc, KERN_PROC_UID, uid, CTLFLAG_RD,
988 sysctl_kern_proc, "Process table");
990 SYSCTL_NODE(_kern_proc, KERN_PROC_RUID, ruid, CTLFLAG_RD,
991 sysctl_kern_proc, "Process table");
993 SYSCTL_NODE(_kern_proc, KERN_PROC_PID, pid, CTLFLAG_RD,
994 sysctl_kern_proc, "Process table");
996 SYSCTL_NODE(_kern_proc, (KERN_PROC_ALL | KERN_PROC_FLAG_LWP), all_lwp, CTLFLAG_RD,
997 sysctl_kern_proc, "Process table");
999 SYSCTL_NODE(_kern_proc, (KERN_PROC_PGRP | KERN_PROC_FLAG_LWP), pgrp_lwp, CTLFLAG_RD,
1000 sysctl_kern_proc, "Process table");
1002 SYSCTL_NODE(_kern_proc, (KERN_PROC_TTY | KERN_PROC_FLAG_LWP), tty_lwp, CTLFLAG_RD,
1003 sysctl_kern_proc, "Process table");
1005 SYSCTL_NODE(_kern_proc, (KERN_PROC_UID | KERN_PROC_FLAG_LWP), uid_lwp, CTLFLAG_RD,
1006 sysctl_kern_proc, "Process table");
1008 SYSCTL_NODE(_kern_proc, (KERN_PROC_RUID | KERN_PROC_FLAG_LWP), ruid_lwp, CTLFLAG_RD,
1009 sysctl_kern_proc, "Process table");
1011 SYSCTL_NODE(_kern_proc, (KERN_PROC_PID | KERN_PROC_FLAG_LWP), pid_lwp, CTLFLAG_RD,
1012 sysctl_kern_proc, "Process table");
1014 SYSCTL_NODE(_kern_proc, KERN_PROC_ARGS, args, CTLFLAG_RW | CTLFLAG_ANYBODY,
1015 sysctl_kern_proc_args, "Process argument list");