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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) {
201 lwkt_reltoken(&proc_token);
205 lwkt_reltoken(&proc_token);
210 * Move p to a new or existing process group (and session)
215 enterpgrp(struct proc *p, pid_t pgid, int mksess)
220 lwkt_gettoken(&proc_token);
223 KASSERT(pgrp == NULL || !mksess,
224 ("enterpgrp: setsid into non-empty pgrp"));
225 KASSERT(!SESS_LEADER(p),
226 ("enterpgrp: session leader attempted setpgrp"));
229 pid_t savepid = p->p_pid;
234 KASSERT(p->p_pid == pgid,
235 ("enterpgrp: new pgrp and pid != pgid"));
236 if ((np = pfind(savepid)) == NULL || np != p) {
240 MALLOC(pgrp, struct pgrp *, sizeof(struct pgrp),
243 struct session *sess;
248 MALLOC(sess, struct session *, sizeof(struct session),
249 M_SESSION, M_WAITOK);
251 sess->s_sid = p->p_pid;
253 sess->s_ttyvp = NULL;
255 bcopy(p->p_session->s_login, sess->s_login,
256 sizeof(sess->s_login));
257 p->p_flag &= ~P_CONTROLT;
258 pgrp->pg_session = sess;
259 KASSERT(p == curproc,
260 ("enterpgrp: mksession and p != curproc"));
262 pgrp->pg_session = p->p_session;
263 sess_hold(pgrp->pg_session);
266 LIST_INIT(&pgrp->pg_members);
267 LIST_INSERT_HEAD(PGRPHASH(pgid), pgrp, pg_hash);
269 SLIST_INIT(&pgrp->pg_sigiolst);
270 lockinit(&pgrp->pg_lock, "pgwt", 0, 0);
271 } else if (pgrp == p->p_pgrp) {
276 * Adjust eligibility of affected pgrps to participate in job control.
277 * Increment eligibility counts before decrementing, otherwise we
278 * could reach 0 spuriously during the first call.
281 fixjobc(p, p->p_pgrp, 0);
283 LIST_REMOVE(p, p_pglist);
284 if (LIST_EMPTY(&p->p_pgrp->pg_members))
287 LIST_INSERT_HEAD(&pgrp->pg_members, p, p_pglist);
291 lwkt_reltoken(&proc_token);
296 * Remove process from process group
301 leavepgrp(struct proc *p)
303 lwkt_gettoken(&proc_token);
304 LIST_REMOVE(p, p_pglist);
305 if (LIST_EMPTY(&p->p_pgrp->pg_members))
308 lwkt_reltoken(&proc_token);
313 * Delete a process group
315 * The caller must hold proc_token.
318 pgdelete(struct pgrp *pgrp)
321 * Reset any sigio structures pointing to us as a result of
322 * F_SETOWN with our pgid.
324 funsetownlst(&pgrp->pg_sigiolst);
326 if (pgrp->pg_session->s_ttyp != NULL &&
327 pgrp->pg_session->s_ttyp->t_pgrp == pgrp)
328 pgrp->pg_session->s_ttyp->t_pgrp = NULL;
329 LIST_REMOVE(pgrp, pg_hash);
330 sess_rele(pgrp->pg_session);
335 * Adjust the ref count on a session structure. When the ref count falls to
336 * zero the tty is disassociated from the session and the session structure
337 * is freed. Note that tty assocation is not itself ref-counted.
342 sess_hold(struct session *sp)
344 lwkt_gettoken(&tty_token);
346 lwkt_reltoken(&tty_token);
353 sess_rele(struct session *sp)
355 KKASSERT(sp->s_count > 0);
356 lwkt_gettoken(&tty_token);
357 if (--sp->s_count == 0) {
358 if (sp->s_ttyp && sp->s_ttyp->t_session) {
359 #ifdef TTY_DO_FULL_CLOSE
360 /* FULL CLOSE, see ttyclearsession() */
361 KKASSERT(sp->s_ttyp->t_session == sp);
362 sp->s_ttyp->t_session = NULL;
364 /* HALF CLOSE, see ttyclearsession() */
365 if (sp->s_ttyp->t_session == sp)
366 sp->s_ttyp->t_session = NULL;
369 kfree(sp, M_SESSION);
371 lwkt_reltoken(&tty_token);
375 * Adjust pgrp jobc counters when specified process changes process group.
376 * We count the number of processes in each process group that "qualify"
377 * the group for terminal job control (those with a parent in a different
378 * process group of the same session). If that count reaches zero, the
379 * process group becomes orphaned. Check both the specified process'
380 * process group and that of its children.
381 * entering == 0 => p is leaving specified group.
382 * entering == 1 => p is entering specified group.
387 fixjobc(struct proc *p, struct pgrp *pgrp, int entering)
389 struct pgrp *hispgrp;
390 struct session *mysession;
393 * Check p's parent to see whether p qualifies its own process
394 * group; if so, adjust count for p's process group.
396 lwkt_gettoken(&proc_token);
397 mysession = pgrp->pg_session;
398 if ((hispgrp = p->p_pptr->p_pgrp) != pgrp &&
399 hispgrp->pg_session == mysession) {
402 else if (--pgrp->pg_jobc == 0)
407 * Check this process' children to see whether they qualify
408 * their process groups; if so, adjust counts for children's
411 LIST_FOREACH(p, &p->p_children, p_sibling) {
412 if ((hispgrp = p->p_pgrp) != pgrp &&
413 hispgrp->pg_session == mysession &&
414 p->p_stat != SZOMB) {
417 else if (--hispgrp->pg_jobc == 0)
421 lwkt_reltoken(&proc_token);
425 * A process group has become orphaned;
426 * if there are any stopped processes in the group,
427 * hang-up all process in that group.
429 * The caller must hold proc_token.
432 orphanpg(struct pgrp *pg)
436 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
437 if (p->p_stat == SSTOP) {
438 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
448 * Add a new process to the allproc list and the PID hash. This
449 * also assigns a pid to the new process.
454 proc_add_allproc(struct proc *p)
458 if ((random_offset = randompid) != 0) {
460 random_offset = karc4random() % random_offset;
464 lwkt_gettoken(&proc_token);
465 p->p_pid = proc_getnewpid_locked(random_offset);
466 LIST_INSERT_HEAD(&allproc, p, p_list);
467 LIST_INSERT_HEAD(PIDHASH(p->p_pid), p, p_hash);
468 lwkt_reltoken(&proc_token);
472 * Calculate a new process pid. This function is integrated into
473 * proc_add_allproc() to guarentee that the new pid is not reused before
474 * the new process can be added to the allproc list.
476 * The caller must hold proc_token.
480 proc_getnewpid_locked(int random_offset)
482 static pid_t nextpid;
483 static pid_t pidchecked;
487 * Find an unused process ID. We remember a range of unused IDs
488 * ready to use (from nextpid+1 through pidchecked-1).
490 nextpid = nextpid + 1 + random_offset;
493 * If the process ID prototype has wrapped around,
494 * restart somewhat above 0, as the low-numbered procs
495 * tend to include daemons that don't exit.
497 if (nextpid >= PID_MAX) {
498 nextpid = nextpid % PID_MAX;
503 if (nextpid >= pidchecked) {
506 pidchecked = PID_MAX;
508 * Scan the active and zombie procs to check whether this pid
509 * is in use. Remember the lowest pid that's greater
510 * than nextpid, so we can avoid checking for a while.
512 p = LIST_FIRST(&allproc);
514 for (; p != 0; p = LIST_NEXT(p, p_list)) {
515 while (p->p_pid == nextpid ||
516 p->p_pgrp->pg_id == nextpid ||
517 p->p_session->s_sid == nextpid) {
519 if (nextpid >= pidchecked)
522 if (p->p_pid > nextpid && pidchecked > p->p_pid)
523 pidchecked = p->p_pid;
524 if (p->p_pgrp->pg_id > nextpid &&
525 pidchecked > p->p_pgrp->pg_id)
526 pidchecked = p->p_pgrp->pg_id;
527 if (p->p_session->s_sid > nextpid &&
528 pidchecked > p->p_session->s_sid)
529 pidchecked = p->p_session->s_sid;
533 p = LIST_FIRST(&zombproc);
541 * Called from exit1 to remove a process from the allproc
542 * list and move it to the zombie list.
547 proc_move_allproc_zombie(struct proc *p)
549 lwkt_gettoken(&proc_token);
551 tsleep(p, 0, "reap1", hz / 10);
553 LIST_REMOVE(p, p_list);
554 LIST_INSERT_HEAD(&zombproc, p, p_list);
555 LIST_REMOVE(p, p_hash);
557 lwkt_reltoken(&proc_token);
562 * This routine is called from kern_wait() and will remove the process
563 * from the zombie list and the sibling list. This routine will block
564 * if someone has a lock on the proces (p_lock).
569 proc_remove_zombie(struct proc *p)
571 lwkt_gettoken(&proc_token);
573 tsleep(p, 0, "reap1", hz / 10);
575 LIST_REMOVE(p, p_list); /* off zombproc */
576 LIST_REMOVE(p, p_sibling);
577 lwkt_reltoken(&proc_token);
581 * Scan all processes on the allproc list. The process is automatically
582 * held for the callback. A return value of -1 terminates the loop.
585 * The callback is made with the process held and proc_token held.
588 allproc_scan(int (*callback)(struct proc *, void *), void *data)
593 lwkt_gettoken(&proc_token);
594 LIST_FOREACH(p, &allproc, p_list) {
596 r = callback(p, data);
601 lwkt_reltoken(&proc_token);
605 * Scan all lwps of processes on the allproc list. The lwp is automatically
606 * held for the callback. A return value of -1 terminates the loop.
609 * The callback is made with the proces and lwp both held, and proc_token held.
612 alllwp_scan(int (*callback)(struct lwp *, void *), void *data)
618 lwkt_gettoken(&proc_token);
619 LIST_FOREACH(p, &allproc, p_list) {
621 FOREACH_LWP_IN_PROC(lp, p) {
623 r = callback(lp, data);
630 lwkt_reltoken(&proc_token);
634 * Scan all processes on the zombproc list. The process is automatically
635 * held for the callback. A return value of -1 terminates the loop.
638 * The callback is made with the proces held and proc_token held.
641 zombproc_scan(int (*callback)(struct proc *, void *), void *data)
646 lwkt_gettoken(&proc_token);
647 LIST_FOREACH(p, &zombproc, p_list) {
649 r = callback(p, data);
654 lwkt_reltoken(&proc_token);
664 DB_SHOW_COMMAND(pgrpdump, pgrpdump)
670 for (i = 0; i <= pgrphash; i++) {
671 if (!LIST_EMPTY(&pgrphashtbl[i])) {
672 kprintf("\tindx %d\n", i);
673 LIST_FOREACH(pgrp, &pgrphashtbl[i], pg_hash) {
675 "\tpgrp %p, pgid %ld, sess %p, sesscnt %d, mem %p\n",
676 (void *)pgrp, (long)pgrp->pg_id,
677 (void *)pgrp->pg_session,
678 pgrp->pg_session->s_count,
679 (void *)LIST_FIRST(&pgrp->pg_members));
680 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
681 kprintf("\t\tpid %ld addr %p pgrp %p\n",
682 (long)p->p_pid, (void *)p,
692 * Locate a process on the zombie list. Return a process or NULL.
694 * The caller must hold proc_token if a stable result is desired.
695 * No other requirements.
702 lwkt_gettoken(&proc_token);
703 LIST_FOREACH(p, &zombproc, p_list) {
704 if (p->p_pid == pid) {
705 lwkt_reltoken(&proc_token);
709 lwkt_reltoken(&proc_token);
714 * The caller must hold proc_token.
717 sysctl_out_proc(struct proc *p, struct sysctl_req *req, int flags)
719 struct kinfo_proc ki;
721 int skp = 0, had_output = 0;
724 bzero(&ki, sizeof(ki));
725 fill_kinfo_proc(p, &ki);
726 if ((flags & KERN_PROC_FLAG_LWP) == 0)
729 FOREACH_LWP_IN_PROC(lp, p) {
731 fill_kinfo_lwp(lp, &ki.kp_lwp);
733 error = SYSCTL_OUT(req, &ki, sizeof(ki));
740 /* We need to output at least the proc, even if there is no lwp. */
741 if (had_output == 0) {
742 error = SYSCTL_OUT(req, &ki, sizeof(ki));
748 * The caller must hold proc_token.
751 sysctl_out_proc_kthread(struct thread *td, struct sysctl_req *req, int flags)
753 struct kinfo_proc ki;
756 fill_kinfo_proc_kthread(td, &ki);
757 error = SYSCTL_OUT(req, &ki, sizeof(ki));
767 sysctl_kern_proc(SYSCTL_HANDLER_ARGS)
769 int *name = (int*) arg1;
770 int oid = oidp->oid_number;
771 u_int namelen = arg2;
773 struct proclist *plist;
775 int doingzomb, flags = 0;
779 struct ucred *cr1 = curproc->p_ucred;
781 flags = oid & KERN_PROC_FLAGMASK;
782 oid &= ~KERN_PROC_FLAGMASK;
784 if ((oid == KERN_PROC_ALL && namelen != 0) ||
785 (oid != KERN_PROC_ALL && namelen != 1))
788 lwkt_gettoken(&proc_token);
789 if (oid == KERN_PROC_PID) {
790 p = pfind((pid_t)name[0]);
793 if (!PRISON_CHECK(cr1, p->p_ucred))
796 error = sysctl_out_proc(p, req, flags);
802 /* overestimate by 5 procs */
803 error = SYSCTL_OUT(req, 0, sizeof (struct kinfo_proc) * 5);
807 for (doingzomb = 0; doingzomb <= 1; doingzomb++) {
812 LIST_FOREACH(p, plist, p_list) {
814 * Show a user only their processes.
816 if ((!ps_showallprocs) && p_trespass(cr1, p->p_ucred))
819 * Skip embryonic processes.
821 if (p->p_stat == SIDL)
824 * TODO - make more efficient (see notes below).
829 /* could do this by traversing pgrp */
830 if (p->p_pgrp == NULL ||
831 p->p_pgrp->pg_id != (pid_t)name[0])
836 if ((p->p_flag & P_CONTROLT) == 0 ||
837 p->p_session == NULL ||
838 p->p_session->s_ttyp == NULL ||
839 dev2udev(p->p_session->s_ttyp->t_dev) !=
845 if (p->p_ucred == NULL ||
846 p->p_ucred->cr_uid != (uid_t)name[0])
851 if (p->p_ucred == NULL ||
852 p->p_ucred->cr_ruid != (uid_t)name[0])
857 if (!PRISON_CHECK(cr1, p->p_ucred))
860 error = sysctl_out_proc(p, req, flags);
868 * Iterate over all active cpus and scan their thread list. Start
869 * with the next logical cpu and end with our original cpu. We
870 * migrate our own thread to each target cpu in order to safely scan
871 * its thread list. In the last loop we migrate back to our original
874 origcpu = mycpu->gd_cpuid;
875 if (!ps_showallthreads || jailed(cr1))
878 for (n = 1; n <= ncpus; ++n) {
882 nid = (origcpu + n) % ncpus;
883 if ((smp_active_mask & (1 << nid)) == 0)
885 rgd = globaldata_find(nid);
886 lwkt_setcpu_self(rgd);
888 TAILQ_FOREACH(td, &mycpu->gd_tdallq, td_allq) {
901 error = sysctl_out_proc_kthread(td, req, doingzomb);
908 lwkt_reltoken(&proc_token);
913 * This sysctl allows a process to retrieve the argument list or process
914 * title for another process without groping around in the address space
915 * of the other process. It also allow a process to set its own "process
916 * title to a string of its own choice.
921 sysctl_kern_proc_args(SYSCTL_HANDLER_ARGS)
923 int *name = (int*) arg1;
924 u_int namelen = arg2;
928 struct ucred *cr1 = curproc->p_ucred;
933 lwkt_gettoken(&proc_token);
934 p = pfind((pid_t)name[0]);
938 if ((!ps_argsopen) && p_trespass(cr1, p->p_ucred))
941 if (req->newptr && curproc != p) {
947 if (req->oldptr && p->p_args != NULL) {
948 error = SYSCTL_OUT(req, p->p_args->ar_args,
949 p->p_args->ar_length);
951 if (req->newptr == NULL) {
956 if (p->p_args && --p->p_args->ar_ref == 0)
957 FREE(p->p_args, M_PARGS);
960 if (req->newlen + sizeof(struct pargs) > ps_arg_cache_limit) {
965 MALLOC(pa, struct pargs *, sizeof(struct pargs) + req->newlen,
968 pa->ar_length = req->newlen;
969 error = SYSCTL_IN(req, pa->ar_args, req->newlen);
976 lwkt_reltoken(&proc_token);
980 SYSCTL_NODE(_kern, KERN_PROC, proc, CTLFLAG_RD, 0, "Process table");
982 SYSCTL_PROC(_kern_proc, KERN_PROC_ALL, all, CTLFLAG_RD|CTLTYPE_STRUCT,
983 0, 0, sysctl_kern_proc, "S,proc", "Return entire process table");
985 SYSCTL_NODE(_kern_proc, KERN_PROC_PGRP, pgrp, CTLFLAG_RD,
986 sysctl_kern_proc, "Process table");
988 SYSCTL_NODE(_kern_proc, KERN_PROC_TTY, tty, CTLFLAG_RD,
989 sysctl_kern_proc, "Process table");
991 SYSCTL_NODE(_kern_proc, KERN_PROC_UID, uid, CTLFLAG_RD,
992 sysctl_kern_proc, "Process table");
994 SYSCTL_NODE(_kern_proc, KERN_PROC_RUID, ruid, CTLFLAG_RD,
995 sysctl_kern_proc, "Process table");
997 SYSCTL_NODE(_kern_proc, KERN_PROC_PID, pid, CTLFLAG_RD,
998 sysctl_kern_proc, "Process table");
1000 SYSCTL_NODE(_kern_proc, (KERN_PROC_ALL | KERN_PROC_FLAG_LWP), all_lwp, CTLFLAG_RD,
1001 sysctl_kern_proc, "Process table");
1003 SYSCTL_NODE(_kern_proc, (KERN_PROC_PGRP | KERN_PROC_FLAG_LWP), pgrp_lwp, CTLFLAG_RD,
1004 sysctl_kern_proc, "Process table");
1006 SYSCTL_NODE(_kern_proc, (KERN_PROC_TTY | KERN_PROC_FLAG_LWP), tty_lwp, CTLFLAG_RD,
1007 sysctl_kern_proc, "Process table");
1009 SYSCTL_NODE(_kern_proc, (KERN_PROC_UID | KERN_PROC_FLAG_LWP), uid_lwp, CTLFLAG_RD,
1010 sysctl_kern_proc, "Process table");
1012 SYSCTL_NODE(_kern_proc, (KERN_PROC_RUID | KERN_PROC_FLAG_LWP), ruid_lwp, CTLFLAG_RD,
1013 sysctl_kern_proc, "Process table");
1015 SYSCTL_NODE(_kern_proc, (KERN_PROC_PID | KERN_PROC_FLAG_LWP), pid_lwp, CTLFLAG_RD,
1016 sysctl_kern_proc, "Process table");
1018 SYSCTL_NODE(_kern_proc, KERN_PROC_ARGS, args, CTLFLAG_RW | CTLFLAG_ANYBODY,
1019 sysctl_kern_proc_args, "Process argument list");