X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/55e303ae13a4cf49d70f2294092726f2fffb9ef2..eee3565979933af707c711411001ba11fe406a3c:/bsd/kern/kern_proc.c diff --git a/bsd/kern/kern_proc.c b/bsd/kern/kern_proc.c index a2907280c..3621eeaff 100644 --- a/bsd/kern/kern_proc.c +++ b/bsd/kern/kern_proc.c @@ -1,16 +1,19 @@ /* - * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2007 Apple Inc. All rights reserved. * - * @APPLE_LICENSE_HEADER_START@ - * - * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. + * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in - * compliance with the License. Please obtain a copy of the License at - * http://www.opensource.apple.com/apsl/ and read it before using this - * file. + * compliance with the License. The rights granted to you under the License + * may not be used to create, or enable the creation or redistribution of, + * unlawful or unlicensed copies of an Apple operating system, or to + * circumvent, violate, or enable the circumvention or violation of, any + * terms of an Apple operating system software license agreement. + * + * Please obtain a copy of the License at + * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER @@ -20,7 +23,7 @@ * Please see the License for the specific language governing rights and * limitations under the License. * - * @APPLE_LICENSE_HEADER_END@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */ /* @@ -57,6 +60,12 @@ * * @(#)kern_proc.c 8.4 (Berkeley) 1/4/94 */ +/* + * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce + * support for mandatory and extensible security protections. This notice + * is included in support of clause 2.2 (b) of the Apple Public License, + * Version 2.0. + */ /* HISTORY * 04-Aug-97 Umesh Vaishampayan (umeshv@apple.com) * Added current_proc_EXTERNAL() function for the use of kernel @@ -70,18 +79,48 @@ #include #include #include -#include -#include +#include #include #include -#include -#include +#include #include #include +#include #include #include #include #include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include /* vm_map_switch_protect() */ +#include +#include +#include +#include +#include +#include +#include + +#if CONFIG_MEMORYSTATUS +#include +#endif + +#if CONFIG_MACF +#include +#endif + +#include /* * Structure associated with user cacheing. @@ -102,367 +141,3197 @@ struct pidhashhead *pidhashtbl; u_long pidhash; struct pgrphashhead *pgrphashtbl; u_long pgrphash; +struct sesshashhead *sesshashtbl; +u_long sesshash; + struct proclist allproc; struct proclist zombproc; +extern struct tty cons; + +extern int cs_debug; + +#if DEBUG +#define __PROC_INTERNAL_DEBUG 1 +#endif +#if CONFIG_COREDUMP +/* Name to give to core files */ +__XNU_PRIVATE_EXTERN char corefilename[MAXPATHLEN+1] = {"/cores/core.%P"}; +#endif + +#if PROC_REF_DEBUG +#include +#endif + +static void orphanpg(struct pgrp * pg); +void proc_name_kdp(task_t t, char * buf, int size); +void * proc_get_uthread_uu_threadlist(void * uthread_v); +int proc_threadname_kdp(void * uth, char * buf, size_t size); +void proc_starttime_kdp(void * p, uint64_t * tv_sec, uint64_t * tv_usec, uint64_t * abstime); +char * proc_name_address(void * p); + +/* TODO: make a header that's exported and usable in osfmk */ +char* proc_best_name(proc_t p); + +static void pgrp_add(struct pgrp * pgrp, proc_t parent, proc_t child); +static void pgrp_remove(proc_t p); +static void pgrp_replace(proc_t p, struct pgrp *pgrp); +static void pgdelete_dropref(struct pgrp *pgrp); +extern void pg_rele_dropref(struct pgrp * pgrp); +static int csops_internal(pid_t pid, int ops, user_addr_t uaddr, user_size_t usersize, user_addr_t uaddittoken); +static boolean_t proc_parent_is_currentproc(proc_t p); + +struct fixjob_iterargs { + struct pgrp * pg; + struct session * mysession; + int entering; +}; + +int fixjob_callback(proc_t, void *); + +uint64_t get_current_unique_pid(void); + + +uint64_t +get_current_unique_pid(void) +{ + proc_t p = current_proc(); + + if (p) + return p->p_uniqueid; + else + return 0; +} /* * Initialize global process hashing structures. */ void -procinit() +procinit(void) { - LIST_INIT(&allproc); LIST_INIT(&zombproc); pidhashtbl = hashinit(maxproc / 4, M_PROC, &pidhash); pgrphashtbl = hashinit(maxproc / 4, M_PROC, &pgrphash); + sesshashtbl = hashinit(maxproc / 4, M_PROC, &sesshash); uihashtbl = hashinit(maxproc / 16, M_PROC, &uihash); +#if CONFIG_PERSONAS + personas_bootstrap(); +#endif } /* * Change the count associated with number of processes - * a given user is using. + * a given user is using. This routine protects the uihash + * with the list lock */ int -chgproccnt(uid, diff) - uid_t uid; - int diff; +chgproccnt(uid_t uid, int diff) { - register struct uidinfo *uip; - register struct uihashhead *uipp; + struct uidinfo *uip; + struct uidinfo *newuip = NULL; + struct uihashhead *uipp; + int retval; +again: + proc_list_lock(); uipp = UIHASH(uid); for (uip = uipp->lh_first; uip != 0; uip = uip->ui_hash.le_next) if (uip->ui_uid == uid) break; if (uip) { uip->ui_proccnt += diff; - if (uip->ui_proccnt > 0) - return (uip->ui_proccnt); + if (uip->ui_proccnt > 0) { + retval = uip->ui_proccnt; + proc_list_unlock(); + goto out; + } if (uip->ui_proccnt < 0) panic("chgproccnt: procs < 0"); LIST_REMOVE(uip, ui_hash); - FREE_ZONE(uip, sizeof *uip, M_PROC); - return (0); + retval = 0; + proc_list_unlock(); + FREE_ZONE(uip, sizeof(*uip), M_PROC); + goto out; } if (diff <= 0) { - if (diff == 0) - return(0); + if (diff == 0) { + retval = 0; + proc_list_unlock(); + goto out; + } panic("chgproccnt: lost user"); } - MALLOC_ZONE(uip, struct uidinfo *, sizeof(*uip), M_PROC, M_WAITOK); - LIST_INSERT_HEAD(uipp, uip, ui_hash); - uip->ui_uid = uid; - uip->ui_proccnt = diff; - return (diff); + if (newuip != NULL) { + uip = newuip; + newuip = NULL; + LIST_INSERT_HEAD(uipp, uip, ui_hash); + uip->ui_uid = uid; + uip->ui_proccnt = diff; + retval = diff; + proc_list_unlock(); + goto out; + } + proc_list_unlock(); + MALLOC_ZONE(newuip, struct uidinfo *, sizeof(*uip), M_PROC, M_WAITOK); + if (newuip == NULL) + panic("chgproccnt: M_PROC zone depleted"); + goto again; +out: + if (newuip != NULL) + FREE_ZONE(newuip, sizeof(*uip), M_PROC); + return(retval); } /* * Is p an inferior of the current process? */ int -inferior(p) - register struct proc *p; +inferior(proc_t p) { + int retval = 0; + proc_list_lock(); for (; p != current_proc(); p = p->p_pptr) - if (p->p_pid == 0) - return (0); - return (1); + if (p->p_pid == 0) + goto out; + retval = 1; +out: + proc_list_unlock(); + return(retval); } + /* * Is p an inferior of t ? */ int -isinferior(p, t) - register struct proc *p; - register struct proc *t; +isinferior(proc_t p, proc_t t) { + int retval = 0; + int nchecked = 0; + proc_t start = p; /* if p==t they are not inferior */ if (p == t) return(0); - for (; p != t; p = p->p_pptr) - if (p->p_pid == 0) - return (0); - return (1); + + proc_list_lock(); + for (; p != t; p = p->p_pptr) { + nchecked++; + + /* Detect here if we're in a cycle */ + if ((p->p_pid == 0) || (p->p_pptr == start) || (nchecked >= nprocs)) + goto out; + } + retval = 1; +out: + proc_list_unlock(); + return(retval); } -/* - * Locate a process by number - */ -struct proc * -pfind(pid) - register pid_t pid; +int +proc_isinferior(int pid1, int pid2) { - register struct proc *p; + proc_t p = PROC_NULL; + proc_t t = PROC_NULL; + int retval = 0; + + if (((p = proc_find(pid1)) != (proc_t)0 ) && ((t = proc_find(pid2)) != (proc_t)0)) + retval = isinferior(p, t); - if (!pid) - return (kernproc); + if (p != PROC_NULL) + proc_rele(p); + if (t != PROC_NULL) + proc_rele(t); - for (p = PIDHASH(pid)->lh_first; p != 0; p = p->p_hash.le_next) - if (p->p_pid == pid) - return (p); - return (NULL); + return(retval); } -/* - * Locate a zombie by PID - */ -__private_extern__ struct proc * -pzfind(pid) - register pid_t pid; +proc_t +proc_find(int pid) { - register struct proc *p; + return(proc_findinternal(pid, 0)); +} - for (p = zombproc.lh_first; p != 0; p = p->p_list.le_next) - if (p->p_pid == pid) - return (p); - return (NULL); +proc_t +proc_findinternal(int pid, int locked) +{ + proc_t p = PROC_NULL; + + if (locked == 0) { + proc_list_lock(); + } + + p = pfind_locked(pid); + if ((p == PROC_NULL) || (p != proc_ref_locked(p))) + p = PROC_NULL; + + if (locked == 0) { + proc_list_unlock(); + } + + return(p); } -/* - * Locate a process group by number - */ -struct pgrp * -pgfind(pgid) - register pid_t pgid; +proc_t +proc_findthread(thread_t thread) { - register struct pgrp *pgrp; + proc_t p = PROC_NULL; + struct uthread *uth; - for (pgrp = PGRPHASH(pgid)->lh_first; pgrp != 0; pgrp = pgrp->pg_hash.le_next) - if (pgrp->pg_id == pgid) - return (pgrp); - return (NULL); + proc_list_lock(); + uth = get_bsdthread_info(thread); + if (uth && (uth->uu_flag & UT_VFORK)) + p = uth->uu_proc; + else + p = (proc_t)(get_bsdthreadtask_info(thread)); + p = proc_ref_locked(p); + proc_list_unlock(); + return(p); } +#if PROC_REF_DEBUG +void +uthread_reset_proc_refcount(void *uthread) { + uthread_t uth; + + if (proc_ref_tracking_disabled) { + return; + } + + uth = (uthread_t) uthread; + + uth->uu_proc_refcount = 0; + uth->uu_pindex = 0; +} -/* - * Move p to a new or existing process group (and session) - */ int -enterpgrp(p, pgid, mksess) - register struct proc *p; - pid_t pgid; - int mksess; -{ - register struct pgrp *pgrp = pgfind(pgid); +uthread_get_proc_refcount(void *uthread) { + uthread_t uth; -#if DIAGNOSTIC - if (pgrp != NULL && mksess) /* firewalls */ - panic("enterpgrp: setsid into non-empty pgrp"); - if (SESS_LEADER(p)) - panic("enterpgrp: session leader attempted setpgrp"); -#endif - if (pgrp == NULL) { - pid_t savepid = p->p_pid; - struct proc *np; - /* - * new process group - */ -#if DIAGNOSTIC - if (p->p_pid != pgid) - panic("enterpgrp: new pgrp and pid != pgid"); -#endif - MALLOC_ZONE(pgrp, struct pgrp *, sizeof(struct pgrp), M_PGRP, - M_WAITOK); - if ((np = pfind(savepid)) == NULL || np != p) { - FREE_ZONE(pgrp, sizeof(struct pgrp), M_PGRP); - return (ESRCH); - } - if (mksess) { - register struct session *sess; + if (proc_ref_tracking_disabled) { + return 0; + } - /* - * new session - */ - MALLOC_ZONE(sess, struct session *, - sizeof(struct session), M_SESSION, M_WAITOK); - sess->s_leader = p; - sess->s_sid = p->p_pid; - sess->s_count = 1; - sess->s_ttyvp = NULL; - sess->s_ttyp = NULL; - bcopy(p->p_session->s_login, sess->s_login, - sizeof(sess->s_login)); - p->p_flag &= ~P_CONTROLT; - pgrp->pg_session = sess; -#if DIAGNOSTIC - if (p != current_proc()) - panic("enterpgrp: mksession and p != curproc"); -#endif - } else { - pgrp->pg_session = p->p_session; - pgrp->pg_session->s_count++; + uth = (uthread_t) uthread; + + return uth->uu_proc_refcount; +} + +static void +record_procref(proc_t p, int count) { + uthread_t uth; + + if (proc_ref_tracking_disabled) { + return; + } + + uth = current_uthread(); + uth->uu_proc_refcount += count; + + if (count == 1) { + if (uth->uu_pindex < NUM_PROC_REFS_TO_TRACK) { + backtrace((uintptr_t *) &uth->uu_proc_pcs[uth->uu_pindex], PROC_REF_STACK_DEPTH); + + uth->uu_proc_ps[uth->uu_pindex] = p; + uth->uu_pindex++; } - pgrp->pg_id = pgid; - LIST_INIT(&pgrp->pg_members); - LIST_INSERT_HEAD(PGRPHASH(pgid), pgrp, pg_hash); - pgrp->pg_jobc = 0; - } else if (pgrp == p->p_pgrp) - return (0); + } +} +#endif + +int +proc_rele(proc_t p) +{ + proc_list_lock(); + proc_rele_locked(p); + proc_list_unlock(); + + return(0); +} + +proc_t +proc_self(void) +{ + struct proc * p; + p = current_proc(); + + proc_list_lock(); + if (p != proc_ref_locked(p)) + p = PROC_NULL; + proc_list_unlock(); + return(p); +} + + +proc_t +proc_ref_locked(proc_t p) +{ + proc_t p1 = p; + + /* if process still in creation return failure */ + if ((p == PROC_NULL) || ((p->p_listflag & P_LIST_INCREATE) != 0)) + return (PROC_NULL); +retry: /* - * Adjust eligibility of affected pgrps to participate in job control. - * Increment eligibility counts before decrementing, otherwise we - * could reach 0 spuriously during the first call. + * Do not return process marked for termination + * or proc_refdrain called without ref wait. + * Wait for proc_refdrain_with_refwait to complete if + * process in refdrain and refwait flag is set. */ - fixjobc(p, pgrp, 1); - fixjobc(p, p->p_pgrp, 0); + if ((p->p_stat != SZOMB) && + ((p->p_listflag & P_LIST_EXITED) == 0) && + ((p->p_listflag & P_LIST_DEAD) == 0) && + (((p->p_listflag & (P_LIST_DRAIN | P_LIST_DRAINWAIT)) == 0) || + ((p->p_listflag & P_LIST_REFWAIT) != 0))) { + if ((p->p_listflag & P_LIST_REFWAIT) != 0) { + msleep(&p->p_listflag, proc_list_mlock, 0, "proc_refwait", 0) ; + goto retry; + } + p->p_refcount++; +#if PROC_REF_DEBUG + record_procref(p, 1); +#endif + } + else + p1 = PROC_NULL; - LIST_REMOVE(p, p_pglist); - if (p->p_pgrp->pg_members.lh_first == 0) - pgdelete(p->p_pgrp); - p->p_pgrp = pgrp; - LIST_INSERT_HEAD(&pgrp->pg_members, p, p_pglist); - return (0); + return(p1); } -/* - * remove process from process group - */ -int -leavepgrp(p) - register struct proc *p; +void +proc_rele_locked(proc_t p) { - LIST_REMOVE(p, p_pglist); - if (p->p_pgrp->pg_members.lh_first == 0) - pgdelete(p->p_pgrp); - p->p_pgrp = 0; - return (0); + if (p->p_refcount > 0) { + p->p_refcount--; +#if PROC_REF_DEBUG + record_procref(p, -1); +#endif + if ((p->p_refcount == 0) && ((p->p_listflag & P_LIST_DRAINWAIT) == P_LIST_DRAINWAIT)) { + p->p_listflag &= ~P_LIST_DRAINWAIT; + wakeup(&p->p_refcount); + } + } else + panic("proc_rele_locked -ve ref\n"); + } -/* - * delete a process group - */ -void -pgdelete(pgrp) - register struct pgrp *pgrp; +proc_t +proc_find_zombref(int pid) { + proc_t p; - if (pgrp->pg_session->s_ttyp != NULL && - pgrp->pg_session->s_ttyp->t_pgrp == pgrp) - pgrp->pg_session->s_ttyp->t_pgrp = NULL; - LIST_REMOVE(pgrp, pg_hash); - if (--pgrp->pg_session->s_count == 0) - FREE_ZONE(pgrp->pg_session, sizeof(struct session), M_SESSION); - FREE_ZONE(pgrp, sizeof *pgrp, M_PGRP); + proc_list_lock(); + + again: + p = pfind_locked(pid); + + /* should we bail? */ + if ((p == PROC_NULL) /* not found */ + || ((p->p_listflag & P_LIST_INCREATE) != 0) /* not created yet */ + || ((p->p_listflag & P_LIST_EXITED) == 0)) { /* not started exit */ + + proc_list_unlock(); + return (PROC_NULL); + } + + /* If someone else is controlling the (unreaped) zombie - wait */ + if ((p->p_listflag & P_LIST_WAITING) != 0) { + (void)msleep(&p->p_stat, proc_list_mlock, PWAIT, "waitcoll", 0); + goto again; + } + p->p_listflag |= P_LIST_WAITING; + + proc_list_unlock(); + + return(p); } void -sessrele(sess) - struct session *sess; +proc_drop_zombref(proc_t p) { - if (--sess->s_count == 0) - FREE_ZONE(sess, sizeof (struct session), M_SESSION); + proc_list_lock(); + if ((p->p_listflag & P_LIST_WAITING) == P_LIST_WAITING) { + p->p_listflag &= ~P_LIST_WAITING; + wakeup(&p->p_stat); + } + proc_list_unlock(); } -static void orphanpg(); -/* - * Adjust pgrp jobc counters when specified process changes process group. - * We count the number of processes in each process group that "qualify" - * the group for terminal job control (those with a parent in a different - * process group of the same session). If that count reaches zero, the - * process group becomes orphaned. Check both the specified process' - * process group and that of its children. - * entering == 0 => p is leaving specified group. - * entering == 1 => p is entering specified group. - */ void -fixjobc(p, pgrp, entering) - register struct proc *p; - register struct pgrp *pgrp; - int entering; +proc_refdrain(proc_t p) { - register struct pgrp *hispgrp; - register struct session *mysession = pgrp->pg_session; + proc_refdrain_with_refwait(p, FALSE); +} - /* - * Check p's parent to see whether p qualifies its own process - * group; if so, adjust count for p's process group. - */ - if ((hispgrp = p->p_pptr->p_pgrp) != pgrp && - hispgrp->pg_session == mysession) - if (entering) - pgrp->pg_jobc++; - else if (--pgrp->pg_jobc == 0) - orphanpg(pgrp); +proc_t +proc_refdrain_with_refwait(proc_t p, boolean_t get_ref_and_allow_wait) +{ + boolean_t initexec = FALSE; + proc_list_lock(); - /* - * Check this process' children to see whether they qualify - * their process groups; if so, adjust counts for children's - * process groups. - */ - for (p = p->p_children.lh_first; p != 0; p = p->p_sibling.le_next) - if ((hispgrp = p->p_pgrp) != pgrp && - hispgrp->pg_session == mysession && - p->p_stat != SZOMB) - if (entering) - hispgrp->pg_jobc++; - else if (--hispgrp->pg_jobc == 0) - orphanpg(hispgrp); -} - -/* - * A process group has become orphaned; - * if there are any stopped processes in the group, - * hang-up all process in that group. - */ -static void -orphanpg(pg) - struct pgrp *pg; -{ - register struct proc *p; - - for (p = pg->pg_members.lh_first; p != 0; p = p->p_pglist.le_next) { - if (p->p_stat == SSTOP) { - for (p = pg->pg_members.lh_first; p != 0; - p = p->p_pglist.le_next) { - pt_setrunnable(p); - psignal(p, SIGHUP); - psignal(p, SIGCONT); - } - return; + p->p_listflag |= P_LIST_DRAIN; + if (get_ref_and_allow_wait) { + /* + * All the calls to proc_ref_locked will wait + * for the flag to get cleared before returning a ref. + */ + p->p_listflag |= P_LIST_REFWAIT; + if (p == initproc) { + initexec = TRUE; } } + + /* Do not wait in ref drain for launchd exec */ + while (p->p_refcount && !initexec) { + p->p_listflag |= P_LIST_DRAINWAIT; + msleep(&p->p_refcount, proc_list_mlock, 0, "proc_refdrain", 0) ; + } + + p->p_listflag &= ~P_LIST_DRAIN; + if (!get_ref_and_allow_wait) { + p->p_listflag |= P_LIST_DEAD; + } else { + /* Return a ref to the caller */ + p->p_refcount++; +#if PROC_REF_DEBUG + record_procref(p, 1); +#endif + } + + proc_list_unlock(); + + if (get_ref_and_allow_wait) { + return (p); + } + return NULL; } -#ifdef DEBUG void -pgrpdump() +proc_refwake(proc_t p) { - register struct pgrp *pgrp; - register struct proc *p; - register i; + proc_list_lock(); + p->p_listflag &= ~P_LIST_REFWAIT; + wakeup(&p->p_listflag); + proc_list_unlock(); +} - for (i = 0; i <= pgrphash; i++) { - if (pgrp = pgrphashtbl[i].lh_first) { - printf("\tindx %d\n", i); - for (; pgrp != 0; pgrp = pgrp->pg_hash.le_next) { - printf("\tpgrp 0x%08x, pgid %d, sess %p, sesscnt %d, mem %p\n", - pgrp, pgrp->pg_id, pgrp->pg_session, - pgrp->pg_session->s_count, - pgrp->pg_members.lh_first); - for (p = pgrp->pg_members.lh_first; p != 0; - p = p->p_pglist.le_next) { - printf("\t\tpid %d addr 0x%08x pgrp 0x%08x\n", - p->p_pid, p, p->p_pgrp); - } - } +proc_t +proc_parentholdref(proc_t p) +{ + proc_t parent = PROC_NULL; + proc_t pp; + int loopcnt = 0; + + + proc_list_lock(); +loop: + pp = p->p_pptr; + if ((pp == PROC_NULL) || (pp->p_stat == SZOMB) || ((pp->p_listflag & (P_LIST_CHILDDRSTART | P_LIST_CHILDDRAINED)) == (P_LIST_CHILDDRSTART | P_LIST_CHILDDRAINED))) { + parent = PROC_NULL; + goto out; + } + + if ((pp->p_listflag & (P_LIST_CHILDDRSTART | P_LIST_CHILDDRAINED)) == P_LIST_CHILDDRSTART) { + pp->p_listflag |= P_LIST_CHILDDRWAIT; + msleep(&pp->p_childrencnt, proc_list_mlock, 0, "proc_parent", 0); + loopcnt++; + if (loopcnt == 5) { + parent = PROC_NULL; + goto out; + } + goto loop; + } + + if ((pp->p_listflag & (P_LIST_CHILDDRSTART | P_LIST_CHILDDRAINED)) == 0) { + pp->p_parentref++; + parent = pp; + goto out; + } + +out: + proc_list_unlock(); + return(parent); +} +int +proc_parentdropref(proc_t p, int listlocked) +{ + if (listlocked == 0) + proc_list_lock(); + + if (p->p_parentref > 0) { + p->p_parentref--; + if ((p->p_parentref == 0) && ((p->p_listflag & P_LIST_PARENTREFWAIT) == P_LIST_PARENTREFWAIT)) { + p->p_listflag &= ~P_LIST_PARENTREFWAIT; + wakeup(&p->p_parentref); } + } else + panic("proc_parentdropref -ve ref\n"); + if (listlocked == 0) + proc_list_unlock(); + + return(0); +} + +void +proc_childdrainstart(proc_t p) +{ +#if __PROC_INTERNAL_DEBUG + if ((p->p_listflag & P_LIST_CHILDDRSTART) == P_LIST_CHILDDRSTART) + panic("proc_childdrainstart: childdrain already started\n"); +#endif + p->p_listflag |= P_LIST_CHILDDRSTART; + /* wait for all that hold parentrefs to drop */ + while (p->p_parentref > 0) { + p->p_listflag |= P_LIST_PARENTREFWAIT; + msleep(&p->p_parentref, proc_list_mlock, 0, "proc_childdrainstart", 0) ; } } -#endif /* DEBUG */ + + +void +proc_childdrainend(proc_t p) +{ +#if __PROC_INTERNAL_DEBUG + if (p->p_childrencnt > 0) + panic("exiting: children stil hanging around\n"); +#endif + p->p_listflag |= P_LIST_CHILDDRAINED; + if ((p->p_listflag & (P_LIST_CHILDLKWAIT |P_LIST_CHILDDRWAIT)) != 0) { + p->p_listflag &= ~(P_LIST_CHILDLKWAIT |P_LIST_CHILDDRWAIT); + wakeup(&p->p_childrencnt); + } +} + +void +proc_checkdeadrefs(__unused proc_t p) +{ +#if __PROC_INTERNAL_DEBUG + if ((p->p_listflag & P_LIST_INHASH) != 0) + panic("proc being freed and still in hash %p: %u\n", p, p->p_listflag); + if (p->p_childrencnt != 0) + panic("proc being freed and pending children cnt %p:%d\n", p, p->p_childrencnt); + if (p->p_refcount != 0) + panic("proc being freed and pending refcount %p:%d\n", p, p->p_refcount); + if (p->p_parentref != 0) + panic("proc being freed and pending parentrefs %p:%d\n", p, p->p_parentref); +#endif +} int -proc_is_classic(struct proc *p) +proc_pid(proc_t p) { - return (p->p_flag & P_CLASSIC) ? 1 : 0; + if (p != NULL) + return (p->p_pid); + return -1; } -struct proc * current_proc_EXTERNAL() +int +proc_ppid(proc_t p) { - return (current_proc()); + if (p != NULL) + return (p->p_ppid); + return -1; +} + +int +proc_selfpid(void) +{ + return (current_proc()->p_pid); +} + +int +proc_selfppid(void) +{ + return (current_proc()->p_ppid); +} + +int +proc_selfcsflags(void) +{ + return (current_proc()->p_csflags); +} + +#if CONFIG_DTRACE +static proc_t +dtrace_current_proc_vforking(void) +{ + thread_t th = current_thread(); + struct uthread *ut = get_bsdthread_info(th); + + if (ut && + ((ut->uu_flag & (UT_VFORK|UT_VFORKING)) == (UT_VFORK|UT_VFORKING))) { + /* + * Handle the narrow window where we're in the vfork syscall, + * but we're not quite ready to claim (in particular, to DTrace) + * that we're running as the child. + */ + return (get_bsdtask_info(get_threadtask(th))); + } + return (current_proc()); +} + +int +dtrace_proc_selfpid(void) +{ + return (dtrace_current_proc_vforking()->p_pid); +} + +int +dtrace_proc_selfppid(void) +{ + return (dtrace_current_proc_vforking()->p_ppid); +} + +uid_t +dtrace_proc_selfruid(void) +{ + return (dtrace_current_proc_vforking()->p_ruid); +} +#endif /* CONFIG_DTRACE */ + +proc_t +proc_parent(proc_t p) +{ + proc_t parent; + proc_t pp; + + proc_list_lock(); +loop: + pp = p->p_pptr; + parent = proc_ref_locked(pp); + if ((parent == PROC_NULL) && (pp != PROC_NULL) && (pp->p_stat != SZOMB) && ((pp->p_listflag & P_LIST_EXITED) != 0) && ((pp->p_listflag & P_LIST_CHILDDRAINED)== 0)){ + pp->p_listflag |= P_LIST_CHILDLKWAIT; + msleep(&pp->p_childrencnt, proc_list_mlock, 0, "proc_parent", 0); + goto loop; + } + proc_list_unlock(); + return(parent); +} + +static boolean_t +proc_parent_is_currentproc(proc_t p) +{ + boolean_t ret = FALSE; + + proc_list_lock(); + if (p->p_pptr == current_proc()) + ret = TRUE; + + proc_list_unlock(); + return ret; +} + +void +proc_name(int pid, char * buf, int size) +{ + proc_t p; + + if ((p = proc_find(pid)) != PROC_NULL) { + strlcpy(buf, &p->p_comm[0], size); + proc_rele(p); + } +} + +void +proc_name_kdp(task_t t, char * buf, int size) +{ + proc_t p = get_bsdtask_info(t); + if (p == PROC_NULL) + return; + + if ((size_t)size > sizeof(p->p_comm)) + strlcpy(buf, &p->p_name[0], MIN((int)sizeof(p->p_name), size)); + else + strlcpy(buf, &p->p_comm[0], MIN((int)sizeof(p->p_comm), size)); +} + +int +proc_threadname_kdp(void * uth, char * buf, size_t size) +{ + if (size < MAXTHREADNAMESIZE) { + /* this is really just a protective measure for the future in + * case the thread name size in stackshot gets out of sync with + * the BSD max thread name size. Note that bsd_getthreadname + * doesn't take input buffer size into account. */ + return -1; + } + + if (uth != NULL) { + bsd_getthreadname(uth, buf); + } + return 0; +} + +/* note that this function is generally going to be called from stackshot, + * and the arguments will be coming from a struct which is declared packed + * thus the input arguments will in general be unaligned. We have to handle + * that here. */ +void +proc_starttime_kdp(void *p, uint64_t *tv_sec, uint64_t *tv_usec, uint64_t *abstime) +{ + proc_t pp = (proc_t)p; + struct uint64p { + uint64_t val; + } __attribute__((packed)); + + if (pp != PROC_NULL) { + if (tv_sec != NULL) + ((struct uint64p *)tv_sec)->val = pp->p_start.tv_sec; + if (tv_usec != NULL) + ((struct uint64p *)tv_usec)->val = pp->p_start.tv_usec; + if (abstime != NULL) { + if (pp->p_stats != NULL) + *abstime = pp->p_stats->ps_start; + else + *abstime = 0; + } + } +} + +char * +proc_name_address(void *p) +{ + return &((proc_t)p)->p_comm[0]; +} + +char * +proc_best_name(proc_t p) +{ + if (p->p_name[0] != 0) + return (&p->p_name[0]); + return (&p->p_comm[0]); +} + +void +proc_selfname(char * buf, int size) +{ + proc_t p; + + if ((p = current_proc())!= (proc_t)0) { + strlcpy(buf, &p->p_comm[0], size); + } +} + +void +proc_signal(int pid, int signum) +{ + proc_t p; + + if ((p = proc_find(pid)) != PROC_NULL) { + psignal(p, signum); + proc_rele(p); + } +} + +int +proc_issignal(int pid, sigset_t mask) +{ + proc_t p; + int error=0; + + if ((p = proc_find(pid)) != PROC_NULL) { + error = proc_pendingsignals(p, mask); + proc_rele(p); + } + + return(error); +} + +int +proc_noremotehang(proc_t p) +{ + int retval = 0; + + if (p) + retval = p->p_flag & P_NOREMOTEHANG; + return(retval? 1: 0); + +} + +int +proc_exiting(proc_t p) +{ + int retval = 0; + + if (p) + retval = p->p_lflag & P_LEXIT; + return(retval? 1: 0); +} + +int +proc_forcequota(proc_t p) +{ + int retval = 0; + + if (p) + retval = p->p_flag & P_FORCEQUOTA; + return(retval? 1: 0); + +} + +int +proc_suser(proc_t p) +{ + kauth_cred_t my_cred; + int error; + + my_cred = kauth_cred_proc_ref(p); + error = suser(my_cred, &p->p_acflag); + kauth_cred_unref(&my_cred); + return(error); +} + +task_t +proc_task(proc_t proc) +{ + return (task_t)proc->task; +} + +/* + * Obtain the first thread in a process + * + * XXX This is a bad thing to do; it exists predominantly to support the + * XXX use of proc_t's in places that should really be using + * XXX thread_t's instead. This maintains historical behaviour, but really + * XXX needs an audit of the context (proxy vs. not) to clean up. + */ +thread_t +proc_thread(proc_t proc) +{ + uthread_t uth = TAILQ_FIRST(&proc->p_uthlist); + + if (uth != NULL) + return(uth->uu_context.vc_thread); + + return(NULL); +} + +kauth_cred_t +proc_ucred(proc_t p) +{ + return(p->p_ucred); +} + +struct uthread * +current_uthread() +{ + thread_t th = current_thread(); + + return((struct uthread *)get_bsdthread_info(th)); +} + + +int +proc_is64bit(proc_t p) +{ + return(IS_64BIT_PROCESS(p)); +} + +int +proc_pidversion(proc_t p) +{ + return(p->p_idversion); +} + +uint32_t +proc_persona_id(proc_t p) +{ + return (uint32_t)persona_id_from_proc(p); +} + +uint32_t +proc_getuid(proc_t p) +{ + return(p->p_uid); +} + +uint32_t +proc_getgid(proc_t p) +{ + return(p->p_gid); +} + +uint64_t +proc_uniqueid(proc_t p) +{ + return(p->p_uniqueid); +} + +uint64_t +proc_puniqueid(proc_t p) +{ + return(p->p_puniqueid); +} + +void +proc_coalitionids(__unused proc_t p, __unused uint64_t ids[COALITION_NUM_TYPES]) +{ +#if CONFIG_COALITIONS + task_coalition_ids(p->task, ids); +#else + memset(ids, 0, sizeof(uint64_t [COALITION_NUM_TYPES])); +#endif + return; +} + +uint64_t +proc_was_throttled(proc_t p) +{ + return (p->was_throttled); +} + +uint64_t +proc_did_throttle(proc_t p) +{ + return (p->did_throttle); +} + +int +proc_getcdhash(proc_t p, unsigned char *cdhash) +{ + return vn_getcdhash(p->p_textvp, p->p_textoff, cdhash); +} + +void +proc_getexecutableuuid(proc_t p, unsigned char *uuidbuf, unsigned long size) +{ + if (size >= sizeof(p->p_uuid)) { + memcpy(uuidbuf, p->p_uuid, sizeof(p->p_uuid)); + } +} + +/* Return vnode for executable with an iocount. Must be released with vnode_put() */ +vnode_t +proc_getexecutablevnode(proc_t p) +{ + vnode_t tvp = p->p_textvp; + + if ( tvp != NULLVP) { + if (vnode_getwithref(tvp) == 0) { + return tvp; + } + } + + return NULLVP; +} + + +void +bsd_set_dependency_capable(task_t task) +{ + proc_t p = get_bsdtask_info(task); + + if (p) { + OSBitOrAtomic(P_DEPENDENCY_CAPABLE, &p->p_flag); + } +} + + +int +IS_64BIT_PROCESS(proc_t p) +{ + if (p && (p->p_flag & P_LP64)) + return(1); + else + return(0); +} + +/* + * Locate a process by number + */ +proc_t +pfind_locked(pid_t pid) +{ + proc_t p; +#if DEBUG + proc_t q; +#endif + + if (!pid) + return (kernproc); + + for (p = PIDHASH(pid)->lh_first; p != 0; p = p->p_hash.le_next) { + if (p->p_pid == pid) { +#if DEBUG + for (q = p->p_hash.le_next; q != 0; q = q->p_hash.le_next) { + if ((p !=q) && (q->p_pid == pid)) + panic("two procs with same pid %p:%p:%d:%d\n", p, q, p->p_pid, q->p_pid); + } +#endif + return (p); + } + } + return (NULL); +} + +/* + * Locate a zombie by PID + */ +__private_extern__ proc_t +pzfind(pid_t pid) +{ + proc_t p; + + + proc_list_lock(); + + for (p = zombproc.lh_first; p != 0; p = p->p_list.le_next) + if (p->p_pid == pid) + break; + + proc_list_unlock(); + + return (p); +} + +/* + * Locate a process group by number + */ + +struct pgrp * +pgfind(pid_t pgid) +{ + struct pgrp * pgrp; + + proc_list_lock(); + pgrp = pgfind_internal(pgid); + if ((pgrp == NULL) || ((pgrp->pg_listflags & PGRP_FLAG_TERMINATE) != 0)) + pgrp = PGRP_NULL; + else + pgrp->pg_refcount++; + proc_list_unlock(); + return(pgrp); +} + + + +struct pgrp * +pgfind_internal(pid_t pgid) +{ + struct pgrp *pgrp; + + for (pgrp = PGRPHASH(pgid)->lh_first; pgrp != 0; pgrp = pgrp->pg_hash.le_next) + if (pgrp->pg_id == pgid) + return (pgrp); + return (NULL); +} + +void +pg_rele(struct pgrp * pgrp) +{ + if(pgrp == PGRP_NULL) + return; + pg_rele_dropref(pgrp); +} + +void +pg_rele_dropref(struct pgrp * pgrp) +{ + proc_list_lock(); + if ((pgrp->pg_refcount == 1) && ((pgrp->pg_listflags & PGRP_FLAG_TERMINATE) == PGRP_FLAG_TERMINATE)) { + proc_list_unlock(); + pgdelete_dropref(pgrp); + return; + } + + pgrp->pg_refcount--; + proc_list_unlock(); +} + +struct session * +session_find_internal(pid_t sessid) +{ + struct session *sess; + + for (sess = SESSHASH(sessid)->lh_first; sess != 0; sess = sess->s_hash.le_next) + if (sess->s_sid == sessid) + return (sess); + return (NULL); +} + + +/* + * Make a new process ready to become a useful member of society by making it + * visible in all the right places and initialize its own lists to empty. + * + * Parameters: parent The parent of the process to insert + * child The child process to insert + * + * Returns: (void) + * + * Notes: Insert a child process into the parents process group, assign + * the child the parent process pointer and PPID of the parent, + * place it on the parents p_children list as a sibling, + * initialize its own child list, place it in the allproc list, + * insert it in the proper hash bucket, and initialize its + * event list. + */ +void +pinsertchild(proc_t parent, proc_t child) +{ + struct pgrp * pg; + + LIST_INIT(&child->p_children); + TAILQ_INIT(&child->p_evlist); + child->p_pptr = parent; + child->p_ppid = parent->p_pid; + child->p_puniqueid = parent->p_uniqueid; + + pg = proc_pgrp(parent); + pgrp_add(pg, parent, child); + pg_rele(pg); + + proc_list_lock(); + +#if CONFIG_MEMORYSTATUS + memorystatus_add(child, TRUE); +#endif + + parent->p_childrencnt++; + LIST_INSERT_HEAD(&parent->p_children, child, p_sibling); + + LIST_INSERT_HEAD(&allproc, child, p_list); + /* mark the completion of proc creation */ + child->p_listflag &= ~P_LIST_INCREATE; + + proc_list_unlock(); +} + +/* + * Move p to a new or existing process group (and session) + * + * Returns: 0 Success + * ESRCH No such process + */ +int +enterpgrp(proc_t p, pid_t pgid, int mksess) +{ + struct pgrp *pgrp; + struct pgrp *mypgrp; + struct session * procsp; + + pgrp = pgfind(pgid); + mypgrp = proc_pgrp(p); + procsp = proc_session(p); + +#if DIAGNOSTIC + if (pgrp != NULL && mksess) /* firewalls */ + panic("enterpgrp: setsid into non-empty pgrp"); + if (SESS_LEADER(p, procsp)) + panic("enterpgrp: session leader attempted setpgrp"); +#endif + if (pgrp == PGRP_NULL) { + pid_t savepid = p->p_pid; + proc_t np = PROC_NULL; + /* + * new process group + */ +#if DIAGNOSTIC + if (p->p_pid != pgid) + panic("enterpgrp: new pgrp and pid != pgid"); +#endif + MALLOC_ZONE(pgrp, struct pgrp *, sizeof(struct pgrp), M_PGRP, + M_WAITOK); + if (pgrp == NULL) + panic("enterpgrp: M_PGRP zone depleted"); + if ((np = proc_find(savepid)) == NULL || np != p) { + if (np != PROC_NULL) + proc_rele(np); + if (mypgrp != PGRP_NULL) + pg_rele(mypgrp); + if (procsp != SESSION_NULL) + session_rele(procsp); + FREE_ZONE(pgrp, sizeof(struct pgrp), M_PGRP); + return (ESRCH); + } + proc_rele(np); + if (mksess) { + struct session *sess; + + /* + * new session + */ + MALLOC_ZONE(sess, struct session *, + sizeof(struct session), M_SESSION, M_WAITOK); + if (sess == NULL) + panic("enterpgrp: M_SESSION zone depleted"); + sess->s_leader = p; + sess->s_sid = p->p_pid; + sess->s_count = 1; + sess->s_ttyvp = NULL; + sess->s_ttyp = TTY_NULL; + sess->s_flags = 0; + sess->s_listflags = 0; + sess->s_ttypgrpid = NO_PID; +#if CONFIG_FINE_LOCK_GROUPS + lck_mtx_init(&sess->s_mlock, proc_mlock_grp, proc_lck_attr); +#else + lck_mtx_init(&sess->s_mlock, proc_lck_grp, proc_lck_attr); +#endif + bcopy(procsp->s_login, sess->s_login, + sizeof(sess->s_login)); + OSBitAndAtomic(~((uint32_t)P_CONTROLT), &p->p_flag); + proc_list_lock(); + LIST_INSERT_HEAD(SESSHASH(sess->s_sid), sess, s_hash); + proc_list_unlock(); + pgrp->pg_session = sess; +#if DIAGNOSTIC + if (p != current_proc()) + panic("enterpgrp: mksession and p != curproc"); +#endif + } else { + proc_list_lock(); + pgrp->pg_session = procsp; + + if ((pgrp->pg_session->s_listflags & (S_LIST_TERM | S_LIST_DEAD)) != 0) + panic("enterpgrp: providing ref to terminating session "); + pgrp->pg_session->s_count++; + proc_list_unlock(); + } + pgrp->pg_id = pgid; +#if CONFIG_FINE_LOCK_GROUPS + lck_mtx_init(&pgrp->pg_mlock, proc_mlock_grp, proc_lck_attr); +#else + lck_mtx_init(&pgrp->pg_mlock, proc_lck_grp, proc_lck_attr); +#endif + LIST_INIT(&pgrp->pg_members); + pgrp->pg_membercnt = 0; + pgrp->pg_jobc = 0; + proc_list_lock(); + pgrp->pg_refcount = 1; + pgrp->pg_listflags = 0; + LIST_INSERT_HEAD(PGRPHASH(pgid), pgrp, pg_hash); + proc_list_unlock(); + } else if (pgrp == mypgrp) { + pg_rele(pgrp); + if (mypgrp != NULL) + pg_rele(mypgrp); + if (procsp != SESSION_NULL) + session_rele(procsp); + return (0); + } + + if (procsp != SESSION_NULL) + session_rele(procsp); + /* + * Adjust eligibility of affected pgrps to participate in job control. + * Increment eligibility counts before decrementing, otherwise we + * could reach 0 spuriously during the first call. + */ + fixjobc(p, pgrp, 1); + fixjobc(p, mypgrp, 0); + + if(mypgrp != PGRP_NULL) + pg_rele(mypgrp); + pgrp_replace(p, pgrp); + pg_rele(pgrp); + + return(0); +} + +/* + * remove process from process group + */ +int +leavepgrp(proc_t p) +{ + + pgrp_remove(p); + return (0); +} + +/* + * delete a process group + */ +static void +pgdelete_dropref(struct pgrp *pgrp) +{ + struct tty *ttyp; + int emptypgrp = 1; + struct session *sessp; + + + pgrp_lock(pgrp); + if (pgrp->pg_membercnt != 0) { + emptypgrp = 0; + } + pgrp_unlock(pgrp); + + proc_list_lock(); + pgrp->pg_refcount--; + if ((emptypgrp == 0) || (pgrp->pg_membercnt != 0)) { + proc_list_unlock(); + return; + } + + pgrp->pg_listflags |= PGRP_FLAG_TERMINATE; + + if (pgrp->pg_refcount > 0) { + proc_list_unlock(); + return; + } + + pgrp->pg_listflags |= PGRP_FLAG_DEAD; + LIST_REMOVE(pgrp, pg_hash); + + proc_list_unlock(); + + ttyp = SESSION_TP(pgrp->pg_session); + if (ttyp != TTY_NULL) { + if (ttyp->t_pgrp == pgrp) { + tty_lock(ttyp); + /* Re-check after acquiring the lock */ + if (ttyp->t_pgrp == pgrp) { + ttyp->t_pgrp = NULL; + pgrp->pg_session->s_ttypgrpid = NO_PID; + } + tty_unlock(ttyp); + } + } + + proc_list_lock(); + + sessp = pgrp->pg_session; + if ((sessp->s_listflags & (S_LIST_TERM | S_LIST_DEAD)) != 0) + panic("pg_deleteref: manipulating refs of already terminating session"); + if (--sessp->s_count == 0) { + if ((sessp->s_listflags & (S_LIST_TERM | S_LIST_DEAD)) != 0) + panic("pg_deleteref: terminating already terminated session"); + sessp->s_listflags |= S_LIST_TERM; + ttyp = SESSION_TP(sessp); + LIST_REMOVE(sessp, s_hash); + proc_list_unlock(); + if (ttyp != TTY_NULL) { + tty_lock(ttyp); + if (ttyp->t_session == sessp) + ttyp->t_session = NULL; + tty_unlock(ttyp); + } + proc_list_lock(); + sessp->s_listflags |= S_LIST_DEAD; + if (sessp->s_count != 0) + panic("pg_deleteref: freeing session in use"); + proc_list_unlock(); +#if CONFIG_FINE_LOCK_GROUPS + lck_mtx_destroy(&sessp->s_mlock, proc_mlock_grp); +#else + lck_mtx_destroy(&sessp->s_mlock, proc_lck_grp); +#endif + FREE_ZONE(sessp, sizeof(struct session), M_SESSION); + } else + proc_list_unlock(); +#if CONFIG_FINE_LOCK_GROUPS + lck_mtx_destroy(&pgrp->pg_mlock, proc_mlock_grp); +#else + lck_mtx_destroy(&pgrp->pg_mlock, proc_lck_grp); +#endif + FREE_ZONE(pgrp, sizeof(*pgrp), M_PGRP); +} + + +/* + * Adjust pgrp jobc counters when specified process changes process group. + * We count the number of processes in each process group that "qualify" + * the group for terminal job control (those with a parent in a different + * process group of the same session). If that count reaches zero, the + * process group becomes orphaned. Check both the specified process' + * process group and that of its children. + * entering == 0 => p is leaving specified group. + * entering == 1 => p is entering specified group. + */ +int +fixjob_callback(proc_t p, void * arg) +{ + struct fixjob_iterargs *fp; + struct pgrp * pg, *hispg; + struct session * mysession, *hissess; + int entering; + + fp = (struct fixjob_iterargs *)arg; + pg = fp->pg; + mysession = fp->mysession; + entering = fp->entering; + + hispg = proc_pgrp(p); + hissess = proc_session(p); + + if ((hispg != pg) && + (hissess == mysession)) { + pgrp_lock(hispg); + if (entering) { + hispg->pg_jobc++; + pgrp_unlock(hispg); + } else if (--hispg->pg_jobc == 0) { + pgrp_unlock(hispg); + orphanpg(hispg); + } else + pgrp_unlock(hispg); + } + if (hissess != SESSION_NULL) + session_rele(hissess); + if (hispg != PGRP_NULL) + pg_rele(hispg); + + return(PROC_RETURNED); +} + +void +fixjobc(proc_t p, struct pgrp *pgrp, int entering) +{ + struct pgrp *hispgrp = PGRP_NULL; + struct session *hissess = SESSION_NULL; + struct session *mysession = pgrp->pg_session; + proc_t parent; + struct fixjob_iterargs fjarg; + boolean_t proc_parent_self; + + /* + * Check if p's parent is current proc, if yes then no need to take + * a ref; calling proc_parent with current proc as parent may + * deadlock if current proc is exiting. + */ + proc_parent_self = proc_parent_is_currentproc(p); + if (proc_parent_self) + parent = current_proc(); + else + parent = proc_parent(p); + + if (parent != PROC_NULL) { + hispgrp = proc_pgrp(parent); + hissess = proc_session(parent); + if (!proc_parent_self) + proc_rele(parent); + } + + + /* + * Check p's parent to see whether p qualifies its own process + * group; if so, adjust count for p's process group. + */ + if ((hispgrp != pgrp) && + (hissess == mysession)) { + pgrp_lock(pgrp); + if (entering) { + pgrp->pg_jobc++; + pgrp_unlock(pgrp); + }else if (--pgrp->pg_jobc == 0) { + pgrp_unlock(pgrp); + orphanpg(pgrp); + } else + pgrp_unlock(pgrp); + } + + if (hissess != SESSION_NULL) + session_rele(hissess); + if (hispgrp != PGRP_NULL) + pg_rele(hispgrp); + + /* + * Check this process' children to see whether they qualify + * their process groups; if so, adjust counts for children's + * process groups. + */ + fjarg.pg = pgrp; + fjarg.mysession = mysession; + fjarg.entering = entering; + proc_childrenwalk(p, fixjob_callback, &fjarg); +} + +/* + * A process group has become orphaned; if there are any stopped processes in + * the group, hang-up all process in that group. + */ +static void +orphanpg(struct pgrp *pgrp) +{ + pid_t *pid_list; + proc_t p; + vm_size_t pid_list_size = 0; + vm_size_t pid_list_size_needed = 0; + int pid_count = 0; + int pid_count_available = 0; + + assert(pgrp != NULL); + + /* allocate outside of the pgrp_lock */ + for (;;) { + pgrp_lock(pgrp); + + boolean_t should_iterate = FALSE; + pid_count_available = 0; + + PGMEMBERS_FOREACH(pgrp, p) { + pid_count_available++; + + if (p->p_stat == SSTOP) { + should_iterate = TRUE; + } + } + + if (pid_count_available == 0 || !should_iterate) { + pgrp_unlock(pgrp); + return; + } + + pid_list_size_needed = pid_count_available * sizeof(pid_t); + if (pid_list_size >= pid_list_size_needed) { + break; + } + pgrp_unlock(pgrp); + + if (pid_list_size != 0) { + kfree(pid_list, pid_list_size); + } + pid_list = kalloc(pid_list_size_needed); + if (!pid_list) { + return; + } + pid_list_size = pid_list_size_needed; + } + + /* no orphaned processes */ + if (pid_list_size == 0) { + pgrp_unlock(pgrp); + return; + } + + PGMEMBERS_FOREACH(pgrp, p) { + pid_list[pid_count++] = proc_pid(p); + if (pid_count >= pid_count_available) { + break; + } + } + pgrp_unlock(pgrp); + + if (pid_count == 0) { + goto out; + } + + for (int i = 0; i < pid_count; i++) { + /* do not handle kernproc */ + if (pid_list[i] == 0) { + continue; + } + p = proc_find(pid_list[i]); + if (!p) { + continue; + } + + proc_transwait(p, 0); + pt_setrunnable(p); + psignal(p, SIGHUP); + psignal(p, SIGCONT); + proc_rele(p); + } + +out: + kfree(pid_list, pid_list_size); + return; +} + +int +proc_is_classic(proc_t p __unused) +{ + return (0); +} + +/* XXX Why does this function exist? Need to kill it off... */ +proc_t +current_proc_EXTERNAL(void) +{ + return (current_proc()); +} + +int +proc_is_forcing_hfs_case_sensitivity(proc_t p) +{ + return (p->p_vfs_iopolicy & P_VFS_IOPOLICY_FORCE_HFS_CASE_SENSITIVITY) ? 1 : 0; +} + +#if CONFIG_COREDUMP +/* + * proc_core_name(name, uid, pid) + * Expand the name described in corefilename, using name, uid, and pid. + * corefilename is a printf-like string, with three format specifiers: + * %N name of process ("name") + * %P process id (pid) + * %U user id (uid) + * For example, "%N.core" is the default; they can be disabled completely + * by using "/dev/null", or all core files can be stored in "/cores/%U/%N-%P". + * This is controlled by the sysctl variable kern.corefile (see above). + */ +__private_extern__ int +proc_core_name(const char *name, uid_t uid, pid_t pid, char *cf_name, + size_t cf_name_len) +{ + const char *format, *appendstr; + char id_buf[11]; /* Buffer for pid/uid -- max 4B */ + size_t i, l, n; + + if (cf_name == NULL) + goto toolong; + + format = corefilename; + for (i = 0, n = 0; n < cf_name_len && format[i]; i++) { + switch (format[i]) { + case '%': /* Format character */ + i++; + switch (format[i]) { + case '%': + appendstr = "%"; + break; + case 'N': /* process name */ + appendstr = name; + break; + case 'P': /* process id */ + snprintf(id_buf, sizeof(id_buf), "%u", pid); + appendstr = id_buf; + break; + case 'U': /* user id */ + snprintf(id_buf, sizeof(id_buf), "%u", uid); + appendstr = id_buf; + break; + case '\0': /* format string ended in % symbol */ + goto endofstring; + default: + appendstr = ""; + log(LOG_ERR, + "Unknown format character %c in `%s'\n", + format[i], format); + } + l = strlen(appendstr); + if ((n + l) >= cf_name_len) + goto toolong; + bcopy(appendstr, cf_name + n, l); + n += l; + break; + default: + cf_name[n++] = format[i]; + } + } + if (format[i] != '\0') + goto toolong; + return (0); +toolong: + log(LOG_ERR, "pid %ld (%s), uid (%u): corename is too long\n", + (long)pid, name, (uint32_t)uid); + return (1); +endofstring: + log(LOG_ERR, "pid %ld (%s), uid (%u): unexpected end of string after %% token\n", + (long)pid, name, (uint32_t)uid); + return (1); +} +#endif /* CONFIG_COREDUMP */ + +/* Code Signing related routines */ + +int +csops(__unused proc_t p, struct csops_args *uap, __unused int32_t *retval) +{ + return(csops_internal(uap->pid, uap->ops, uap->useraddr, + uap->usersize, USER_ADDR_NULL)); +} + +int +csops_audittoken(__unused proc_t p, struct csops_audittoken_args *uap, __unused int32_t *retval) +{ + if (uap->uaudittoken == USER_ADDR_NULL) + return(EINVAL); + return(csops_internal(uap->pid, uap->ops, uap->useraddr, + uap->usersize, uap->uaudittoken)); +} + +static int +csops_copy_token(void *start, size_t length, user_size_t usize, user_addr_t uaddr) +{ + char fakeheader[8] = { 0 }; + int error; + + if (usize < sizeof(fakeheader)) + return ERANGE; + + /* if no blob, fill in zero header */ + if (NULL == start) { + start = fakeheader; + length = sizeof(fakeheader); + } else if (usize < length) { + /* ... if input too short, copy out length of entitlement */ + uint32_t length32 = htonl((uint32_t)length); + memcpy(&fakeheader[4], &length32, sizeof(length32)); + + error = copyout(fakeheader, uaddr, sizeof(fakeheader)); + if (error == 0) + return ERANGE; /* input buffer to short, ERANGE signals that */ + return error; + } + return copyout(start, uaddr, length); +} + +static int +csops_internal(pid_t pid, int ops, user_addr_t uaddr, user_size_t usersize, user_addr_t uaudittoken) +{ + size_t usize = (size_t)CAST_DOWN(size_t, usersize); + proc_t pt; + int forself; + int error; + vnode_t tvp; + off_t toff; + unsigned char cdhash[SHA1_RESULTLEN]; + audit_token_t token; + unsigned int upid=0, uidversion = 0; + + forself = error = 0; + + if (pid == 0) + pid = proc_selfpid(); + if (pid == proc_selfpid()) + forself = 1; + + + switch (ops) { + case CS_OPS_STATUS: + case CS_OPS_CDHASH: + case CS_OPS_PIDOFFSET: + case CS_OPS_ENTITLEMENTS_BLOB: + case CS_OPS_IDENTITY: + case CS_OPS_BLOB: + break; /* not restricted to root */ + default: + if (forself == 0 && kauth_cred_issuser(kauth_cred_get()) != TRUE) + return(EPERM); + break; + } + + pt = proc_find(pid); + if (pt == PROC_NULL) + return(ESRCH); + + upid = pt->p_pid; + uidversion = pt->p_idversion; + if (uaudittoken != USER_ADDR_NULL) { + + error = copyin(uaudittoken, &token, sizeof(audit_token_t)); + if (error != 0) + goto out; + /* verify the audit token pid/idversion matches with proc */ + if ((token.val[5] != upid) || (token.val[7] != uidversion)) { + error = ESRCH; + goto out; + } + } + +#if CONFIG_MACF + switch (ops) { + case CS_OPS_MARKINVALID: + case CS_OPS_MARKHARD: + case CS_OPS_MARKKILL: + case CS_OPS_MARKRESTRICT: + case CS_OPS_SET_STATUS: + case CS_OPS_CLEARINSTALLER: + if ((error = mac_proc_check_set_cs_info(current_proc(), pt, ops))) + goto out; + break; + default: + if ((error = mac_proc_check_get_cs_info(current_proc(), pt, ops))) + goto out; + } +#endif + + switch (ops) { + + case CS_OPS_STATUS: { + uint32_t retflags; + + proc_lock(pt); + retflags = pt->p_csflags; + if (cs_enforcement(pt)) + retflags |= CS_ENFORCEMENT; + if (csproc_get_platform_binary(pt)) + retflags |= CS_PLATFORM_BINARY; + if (csproc_get_platform_path(pt)) + retflags |= CS_PLATFORM_PATH; + proc_unlock(pt); + + if (uaddr != USER_ADDR_NULL) + error = copyout(&retflags, uaddr, sizeof(uint32_t)); + break; + } + case CS_OPS_MARKINVALID: + proc_lock(pt); + if ((pt->p_csflags & CS_VALID) == CS_VALID) { /* is currently valid */ + pt->p_csflags &= ~CS_VALID; /* set invalid */ + if ((pt->p_csflags & CS_KILL) == CS_KILL) { + pt->p_csflags |= CS_KILLED; + proc_unlock(pt); + if (cs_debug) { + printf("CODE SIGNING: marked invalid by pid %d: " + "p=%d[%s] honoring CS_KILL, final status 0x%x\n", + proc_selfpid(), pt->p_pid, pt->p_comm, pt->p_csflags); + } + psignal(pt, SIGKILL); + } else + proc_unlock(pt); + } else + proc_unlock(pt); + + break; + + case CS_OPS_MARKHARD: + proc_lock(pt); + pt->p_csflags |= CS_HARD; + if ((pt->p_csflags & CS_VALID) == 0) { + /* @@@ allow? reject? kill? @@@ */ + proc_unlock(pt); + error = EINVAL; + goto out; + } else + proc_unlock(pt); + break; + + case CS_OPS_MARKKILL: + proc_lock(pt); + pt->p_csflags |= CS_KILL; + if ((pt->p_csflags & CS_VALID) == 0) { + proc_unlock(pt); + psignal(pt, SIGKILL); + } else + proc_unlock(pt); + break; + + case CS_OPS_PIDOFFSET: + toff = pt->p_textoff; + proc_rele(pt); + error = copyout(&toff, uaddr, sizeof(toff)); + return(error); + + case CS_OPS_CDHASH: + + /* pt already holds a reference on its p_textvp */ + tvp = pt->p_textvp; + toff = pt->p_textoff; + + if (tvp == NULLVP || usize != SHA1_RESULTLEN) { + proc_rele(pt); + return EINVAL; + } + + error = vn_getcdhash(tvp, toff, cdhash); + proc_rele(pt); + + if (error == 0) { + error = copyout(cdhash, uaddr, sizeof (cdhash)); + } + + return error; + + case CS_OPS_ENTITLEMENTS_BLOB: { + void *start; + size_t length; + + proc_lock(pt); + + if ((pt->p_csflags & (CS_VALID | CS_DEBUGGED)) == 0) { + proc_unlock(pt); + error = EINVAL; + break; + } + + error = cs_entitlements_blob_get(pt, &start, &length); + proc_unlock(pt); + if (error) + break; + + error = csops_copy_token(start, length, usize, uaddr); + break; + } + case CS_OPS_MARKRESTRICT: + proc_lock(pt); + pt->p_csflags |= CS_RESTRICT; + proc_unlock(pt); + break; + + case CS_OPS_SET_STATUS: { + uint32_t flags; + + if (usize < sizeof(flags)) { + error = ERANGE; + break; + } + + error = copyin(uaddr, &flags, sizeof(flags)); + if (error) + break; + + /* only allow setting a subset of all code sign flags */ + flags &= + CS_HARD | CS_EXEC_SET_HARD | + CS_KILL | CS_EXEC_SET_KILL | + CS_RESTRICT | + CS_REQUIRE_LV | + CS_ENFORCEMENT | CS_EXEC_SET_ENFORCEMENT; + + proc_lock(pt); + if (pt->p_csflags & CS_VALID) + pt->p_csflags |= flags; + else + error = EINVAL; + proc_unlock(pt); + + break; + } + case CS_OPS_BLOB: { + void *start; + size_t length; + + proc_lock(pt); + if ((pt->p_csflags & (CS_VALID | CS_DEBUGGED)) == 0) { + proc_unlock(pt); + error = EINVAL; + break; + } + + error = cs_blob_get(pt, &start, &length); + proc_unlock(pt); + if (error) + break; + + error = csops_copy_token(start, length, usize, uaddr); + break; + } + case CS_OPS_IDENTITY: { + const char *identity; + uint8_t fakeheader[8]; + uint32_t idlen; + size_t length; + + /* + * Make identity have a blob header to make it + * easier on userland to guess the identity + * length. + */ + if (usize < sizeof(fakeheader)) { + error = ERANGE; + break; + } + memset(fakeheader, 0, sizeof(fakeheader)); + + proc_lock(pt); + if ((pt->p_csflags & (CS_VALID | CS_DEBUGGED)) == 0) { + proc_unlock(pt); + error = EINVAL; + break; + } + + identity = cs_identity_get(pt); + proc_unlock(pt); + if (identity == NULL) { + error = ENOENT; + break; + } + + length = strlen(identity) + 1; /* include NUL */ + idlen = htonl(length + sizeof(fakeheader)); + memcpy(&fakeheader[4], &idlen, sizeof(idlen)); + + error = copyout(fakeheader, uaddr, sizeof(fakeheader)); + if (error) + break; + + if (usize < sizeof(fakeheader) + length) + error = ERANGE; + else if (usize > sizeof(fakeheader)) + error = copyout(identity, uaddr + sizeof(fakeheader), length); + + break; + } + + case CS_OPS_CLEARINSTALLER: + proc_lock(pt); + pt->p_csflags &= ~(CS_INSTALLER | CS_EXEC_SET_INSTALLER); + proc_unlock(pt); + break; + + default: + error = EINVAL; + break; + } +out: + proc_rele(pt); + return(error); +} + +int +proc_iterate( + unsigned int flags, + proc_iterate_fn_t callout, + void *arg, + proc_iterate_fn_t filterfn, + void *filterarg) +{ + pid_t *pid_list; + vm_size_t pid_list_size = 0; + vm_size_t pid_list_size_needed = 0; + int pid_count = 0; + int pid_count_available = 0; + + assert(callout != NULL); + + /* allocate outside of the proc_list_lock */ + for (;;) { + proc_list_lock(); + + pid_count_available = nprocs; + assert(pid_count_available > 0); + + pid_list_size_needed = pid_count_available * sizeof(pid_t); + if (pid_list_size >= pid_list_size_needed) { + break; + } + proc_list_unlock(); + + if (pid_list_size != 0) { + kfree(pid_list, pid_list_size); + } + pid_list = kalloc(pid_list_size_needed); + if (!pid_list) { + return 1; + } + pid_list_size = pid_list_size_needed; + } + + /* filter pids into pid_list */ + + if (flags & PROC_ALLPROCLIST) { + proc_t p; + ALLPROC_FOREACH(p) { + /* ignore processes that are being forked */ + if (p->p_stat == SIDL) { + continue; + } + if ((filterfn != NULL) && (filterfn(p, filterarg) == 0)) { + continue; + } + + pid_list[pid_count++] = proc_pid(p); + if (pid_count >= pid_count_available) { + break; + } + } + } + + if ((pid_count < pid_count_available) && + (flags & PROC_ZOMBPROCLIST)) + { + proc_t p; + ZOMBPROC_FOREACH(p) { + if ((filterfn != NULL) && (filterfn(p, filterarg) == 0)) { + continue; + } + + pid_list[pid_count++] = proc_pid(p); + if (pid_count >= pid_count_available) { + break; + } + } + } + + proc_list_unlock(); + + /* call callout on processes in the pid_list */ + + for (int i = 0; i < pid_count; i++) { + proc_t p = proc_find(pid_list[i]); + if (p) { + if ((flags & PROC_NOWAITTRANS) == 0) { + proc_transwait(p, 0); + } + int callout_ret = callout(p, arg); + + switch (callout_ret) { + case PROC_RETURNED_DONE: + proc_rele(p); + /* FALLTHROUGH */ + case PROC_CLAIMED_DONE: + goto out; + + case PROC_RETURNED: + proc_rele(p); + /* FALLTHROUGH */ + case PROC_CLAIMED: + break; + + default: + panic("proc_iterate: callout returned %d for pid %d", + callout_ret, pid_list[i]); + break; + } + } else if (flags & PROC_ZOMBPROCLIST) { + p = proc_find_zombref(pid_list[i]); + if (!p) { + continue; + } + int callout_ret = callout(p, arg); + + switch (callout_ret) { + case PROC_RETURNED_DONE: + proc_drop_zombref(p); + /* FALLTHROUGH */ + case PROC_CLAIMED_DONE: + goto out; + + case PROC_RETURNED: + proc_drop_zombref(p); + /* FALLTHROUGH */ + case PROC_CLAIMED: + break; + + default: + panic("proc_iterate: callout returned %d for zombie pid %d", + callout_ret, pid_list[i]); + break; + } + } + } + +out: + kfree(pid_list, pid_list_size); + return 0; + +} + +void +proc_rebootscan( + proc_iterate_fn_t callout, + void *arg, + proc_iterate_fn_t filterfn, + void *filterarg) +{ + proc_t p; + + assert(callout != NULL); + + proc_shutdown_exitcount = 0; + +restart_foreach: + + proc_list_lock(); + + ALLPROC_FOREACH(p) { + if ((filterfn != NULL) && filterfn(p, filterarg) == 0) { + continue; + } + p = proc_ref_locked(p); + if (!p) { + continue; + } + + proc_list_unlock(); + + proc_transwait(p, 0); + (void)callout(p, arg); + proc_rele(p); + + goto restart_foreach; + } + + proc_list_unlock(); +} + +int +proc_childrenwalk( + proc_t parent, + proc_iterate_fn_t callout, + void *arg) +{ + pid_t *pid_list; + vm_size_t pid_list_size = 0; + vm_size_t pid_list_size_needed = 0; + int pid_count = 0; + int pid_count_available = 0; + + assert(parent != NULL); + assert(callout != NULL); + + for (;;) { + proc_list_lock(); + + pid_count_available = parent->p_childrencnt; + if (pid_count_available == 0) { + proc_list_unlock(); + return 0; + } + + pid_list_size_needed = pid_count_available * sizeof(pid_t); + if (pid_list_size >= pid_list_size_needed) { + break; + } + proc_list_unlock(); + + if (pid_list_size != 0) { + kfree(pid_list, pid_list_size); + } + pid_list = kalloc(pid_list_size_needed); + if (!pid_list) { + return 1; + } + pid_list_size = pid_list_size_needed; + } + + proc_t p; + PCHILDREN_FOREACH(parent, p) { + if (p->p_stat == SIDL) { + continue; + } + + pid_list[pid_count++] = proc_pid(p); + if (pid_count >= pid_count_available) { + break; + } + } + + proc_list_unlock(); + + for (int i = 0; i < pid_count; i++) { + p = proc_find(pid_list[i]); + if (!p) { + continue; + } + + int callout_ret = callout(p, arg); + + switch (callout_ret) { + case PROC_RETURNED_DONE: + proc_rele(p); + /* FALLTHROUGH */ + case PROC_CLAIMED_DONE: + goto out; + + case PROC_RETURNED: + proc_rele(p); + /* FALLTHROUGH */ + case PROC_CLAIMED: + break; + default: + panic("proc_childrenwalk: callout returned %d for pid %d", + callout_ret, pid_list[i]); + break; + } + } + +out: + kfree(pid_list, pid_list_size); + return 0; +} + +int +pgrp_iterate( + struct pgrp *pgrp, + unsigned int flags, + proc_iterate_fn_t callout, + void * arg, + proc_iterate_fn_t filterfn, + void * filterarg) +{ + pid_t *pid_list; + proc_t p; + vm_size_t pid_list_size = 0; + vm_size_t pid_list_size_needed = 0; + int pid_count = 0; + int pid_count_available = 0; + + pid_t pgid; + + assert(pgrp != NULL); + assert(callout != NULL); + + for (;;) { + pgrp_lock(pgrp); + + pid_count_available = pgrp->pg_membercnt; + if (pid_count_available == 0) { + pgrp_unlock(pgrp); + return 0; + } + + pid_list_size_needed = pid_count_available * sizeof(pid_t); + if (pid_list_size >= pid_list_size_needed) { + break; + } + pgrp_unlock(pgrp); + + if (pid_list_size != 0) { + kfree(pid_list, pid_list_size); + } + pid_list = kalloc(pid_list_size_needed); + if (!pid_list) { + return 1; + } + pid_list_size = pid_list_size_needed; + } + + pgid = pgrp->pg_id; + + PGMEMBERS_FOREACH(pgrp, p) { + if ((filterfn != NULL) && (filterfn(p, filterarg) == 0)) { + continue;; + } + pid_list[pid_count++] = proc_pid(p); + if (pid_count >= pid_count_available) { + break; + } + } + + pgrp_unlock(pgrp); + + if (flags & PGRP_DROPREF) { + pg_rele(pgrp); + } + + for (int i = 0; i< pid_count; i++) { + /* do not handle kernproc */ + if (pid_list[i] == 0) { + continue; + } + p = proc_find(pid_list[i]); + if (!p) { + continue; + } + if (p->p_pgrpid != pgid) { + proc_rele(p); + continue; + } + + int callout_ret = callout(p, arg); + + switch (callout_ret) { + case PROC_RETURNED: + proc_rele(p); + /* FALLTHROUGH */ + case PROC_CLAIMED: + break; + + case PROC_RETURNED_DONE: + proc_rele(p); + /* FALLTHROUGH */ + case PROC_CLAIMED_DONE: + goto out; + + default: + panic("pgrp_iterate: callout returned %d for pid %d", + callout_ret, pid_list[i]); + } + } + +out: + kfree(pid_list, pid_list_size); + return 0; +} + +static void +pgrp_add(struct pgrp * pgrp, struct proc * parent, struct proc * child) +{ + proc_list_lock(); + child->p_pgrp = pgrp; + child->p_pgrpid = pgrp->pg_id; + child->p_listflag |= P_LIST_INPGRP; + /* + * When pgrp is being freed , a process can still + * request addition using setpgid from bash when + * login is terminated (login cycler) return ESRCH + * Safe to hold lock due to refcount on pgrp + */ + if ((pgrp->pg_listflags & (PGRP_FLAG_TERMINATE | PGRP_FLAG_DEAD)) == PGRP_FLAG_TERMINATE) { + pgrp->pg_listflags &= ~PGRP_FLAG_TERMINATE; + } + + if ((pgrp->pg_listflags & PGRP_FLAG_DEAD) == PGRP_FLAG_DEAD) + panic("pgrp_add : pgrp is dead adding process"); + proc_list_unlock(); + + pgrp_lock(pgrp); + pgrp->pg_membercnt++; + if ( parent != PROC_NULL) { + LIST_INSERT_AFTER(parent, child, p_pglist); + }else { + LIST_INSERT_HEAD(&pgrp->pg_members, child, p_pglist); + } + pgrp_unlock(pgrp); + + proc_list_lock(); + if (((pgrp->pg_listflags & (PGRP_FLAG_TERMINATE | PGRP_FLAG_DEAD)) == PGRP_FLAG_TERMINATE) && (pgrp->pg_membercnt != 0)) { + pgrp->pg_listflags &= ~PGRP_FLAG_TERMINATE; + } + proc_list_unlock(); +} + +static void +pgrp_remove(struct proc * p) +{ + struct pgrp * pg; + + pg = proc_pgrp(p); + + proc_list_lock(); +#if __PROC_INTERNAL_DEBUG + if ((p->p_listflag & P_LIST_INPGRP) == 0) + panic("removing from pglist but no named ref\n"); +#endif + p->p_pgrpid = PGRPID_DEAD; + p->p_listflag &= ~P_LIST_INPGRP; + p->p_pgrp = NULL; + proc_list_unlock(); + + if (pg == PGRP_NULL) + panic("pgrp_remove: pg is NULL"); + pgrp_lock(pg); + pg->pg_membercnt--; + + if (pg->pg_membercnt < 0) + panic("pgprp: -ve membercnt pgprp:%p p:%p\n",pg, p); + + LIST_REMOVE(p, p_pglist); + if (pg->pg_members.lh_first == 0) { + pgrp_unlock(pg); + pgdelete_dropref(pg); + } else { + pgrp_unlock(pg); + pg_rele(pg); + } +} + + +/* cannot use proc_pgrp as it maybe stalled */ +static void +pgrp_replace(struct proc * p, struct pgrp * newpg) +{ + struct pgrp * oldpg; + + + + proc_list_lock(); + + while ((p->p_listflag & P_LIST_PGRPTRANS) == P_LIST_PGRPTRANS) { + p->p_listflag |= P_LIST_PGRPTRWAIT; + (void)msleep(&p->p_pgrpid, proc_list_mlock, 0, "proc_pgrp", 0); + } + + p->p_listflag |= P_LIST_PGRPTRANS; + + oldpg = p->p_pgrp; + if (oldpg == PGRP_NULL) + panic("pgrp_replace: oldpg NULL"); + oldpg->pg_refcount++; +#if __PROC_INTERNAL_DEBUG + if ((p->p_listflag & P_LIST_INPGRP) == 0) + panic("removing from pglist but no named ref\n"); +#endif + p->p_pgrpid = PGRPID_DEAD; + p->p_listflag &= ~P_LIST_INPGRP; + p->p_pgrp = NULL; + + proc_list_unlock(); + + pgrp_lock(oldpg); + oldpg->pg_membercnt--; + if (oldpg->pg_membercnt < 0) + panic("pgprp: -ve membercnt pgprp:%p p:%p\n",oldpg, p); + LIST_REMOVE(p, p_pglist); + if (oldpg->pg_members.lh_first == 0) { + pgrp_unlock(oldpg); + pgdelete_dropref(oldpg); + } else { + pgrp_unlock(oldpg); + pg_rele(oldpg); + } + + proc_list_lock(); + p->p_pgrp = newpg; + p->p_pgrpid = newpg->pg_id; + p->p_listflag |= P_LIST_INPGRP; + /* + * When pgrp is being freed , a process can still + * request addition using setpgid from bash when + * login is terminated (login cycler) return ESRCH + * Safe to hold lock due to refcount on pgrp + */ + if ((newpg->pg_listflags & (PGRP_FLAG_TERMINATE | PGRP_FLAG_DEAD)) == PGRP_FLAG_TERMINATE) { + newpg->pg_listflags &= ~PGRP_FLAG_TERMINATE; + } + + if ((newpg->pg_listflags & PGRP_FLAG_DEAD) == PGRP_FLAG_DEAD) + panic("pgrp_add : pgrp is dead adding process"); + proc_list_unlock(); + + pgrp_lock(newpg); + newpg->pg_membercnt++; + LIST_INSERT_HEAD(&newpg->pg_members, p, p_pglist); + pgrp_unlock(newpg); + + proc_list_lock(); + if (((newpg->pg_listflags & (PGRP_FLAG_TERMINATE | PGRP_FLAG_DEAD)) == PGRP_FLAG_TERMINATE) && (newpg->pg_membercnt != 0)) { + newpg->pg_listflags &= ~PGRP_FLAG_TERMINATE; + } + + p->p_listflag &= ~P_LIST_PGRPTRANS; + if ((p->p_listflag & P_LIST_PGRPTRWAIT) == P_LIST_PGRPTRWAIT) { + p->p_listflag &= ~P_LIST_PGRPTRWAIT; + wakeup(&p->p_pgrpid); + + } + proc_list_unlock(); +} + +void +pgrp_lock(struct pgrp * pgrp) +{ + lck_mtx_lock(&pgrp->pg_mlock); +} + +void +pgrp_unlock(struct pgrp * pgrp) +{ + lck_mtx_unlock(&pgrp->pg_mlock); +} + +void +session_lock(struct session * sess) +{ + lck_mtx_lock(&sess->s_mlock); +} + + +void +session_unlock(struct session * sess) +{ + lck_mtx_unlock(&sess->s_mlock); +} + +struct pgrp * +proc_pgrp(proc_t p) +{ + struct pgrp * pgrp; + + if (p == PROC_NULL) + return(PGRP_NULL); + proc_list_lock(); + + while ((p->p_listflag & P_LIST_PGRPTRANS) == P_LIST_PGRPTRANS) { + p->p_listflag |= P_LIST_PGRPTRWAIT; + (void)msleep(&p->p_pgrpid, proc_list_mlock, 0, "proc_pgrp", 0); + } + + pgrp = p->p_pgrp; + + assert(pgrp != NULL); + + if (pgrp != PGRP_NULL) { + pgrp->pg_refcount++; + if ((pgrp->pg_listflags & (PGRP_FLAG_TERMINATE | PGRP_FLAG_DEAD)) != 0) + panic("proc_pgrp: ref being povided for dead pgrp"); + } + + proc_list_unlock(); + + return(pgrp); +} + +struct pgrp * +tty_pgrp(struct tty * tp) +{ + struct pgrp * pg = PGRP_NULL; + + proc_list_lock(); + pg = tp->t_pgrp; + + if (pg != PGRP_NULL) { + if ((pg->pg_listflags & PGRP_FLAG_DEAD) != 0) + panic("tty_pgrp: ref being povided for dead pgrp"); + pg->pg_refcount++; + } + proc_list_unlock(); + + return(pg); +} + +struct session * +proc_session(proc_t p) +{ + struct session * sess = SESSION_NULL; + + if (p == PROC_NULL) + return(SESSION_NULL); + + proc_list_lock(); + + /* wait during transitions */ + while ((p->p_listflag & P_LIST_PGRPTRANS) == P_LIST_PGRPTRANS) { + p->p_listflag |= P_LIST_PGRPTRWAIT; + (void)msleep(&p->p_pgrpid, proc_list_mlock, 0, "proc_pgrp", 0); + } + + if ((p->p_pgrp != PGRP_NULL) && ((sess = p->p_pgrp->pg_session) != SESSION_NULL)) { + if ((sess->s_listflags & (S_LIST_TERM | S_LIST_DEAD)) != 0) + panic("proc_session:returning sesssion ref on terminating session"); + sess->s_count++; + } + proc_list_unlock(); + return(sess); +} + +void +session_rele(struct session *sess) +{ + proc_list_lock(); + if (--sess->s_count == 0) { + if ((sess->s_listflags & (S_LIST_TERM | S_LIST_DEAD)) != 0) + panic("session_rele: terminating already terminated session"); + sess->s_listflags |= S_LIST_TERM; + LIST_REMOVE(sess, s_hash); + sess->s_listflags |= S_LIST_DEAD; + if (sess->s_count != 0) + panic("session_rele: freeing session in use"); + proc_list_unlock(); +#if CONFIG_FINE_LOCK_GROUPS + lck_mtx_destroy(&sess->s_mlock, proc_mlock_grp); +#else + lck_mtx_destroy(&sess->s_mlock, proc_lck_grp); +#endif + FREE_ZONE(sess, sizeof(struct session), M_SESSION); + } else + proc_list_unlock(); +} + +int +proc_transstart(proc_t p, int locked, int non_blocking) +{ + if (locked == 0) + proc_lock(p); + while ((p->p_lflag & P_LINTRANSIT) == P_LINTRANSIT) { + if (((p->p_lflag & P_LTRANSCOMMIT) == P_LTRANSCOMMIT) || non_blocking) { + if (locked == 0) + proc_unlock(p); + return EDEADLK; + } + p->p_lflag |= P_LTRANSWAIT; + msleep(&p->p_lflag, &p->p_mlock, 0, "proc_signstart", NULL); + } + p->p_lflag |= P_LINTRANSIT; + p->p_transholder = current_thread(); + if (locked == 0) + proc_unlock(p); + return 0; +} + +void +proc_transcommit(proc_t p, int locked) +{ + if (locked == 0) + proc_lock(p); + + assert ((p->p_lflag & P_LINTRANSIT) == P_LINTRANSIT); + assert (p->p_transholder == current_thread()); + p->p_lflag |= P_LTRANSCOMMIT; + + if ((p->p_lflag & P_LTRANSWAIT) == P_LTRANSWAIT) { + p->p_lflag &= ~P_LTRANSWAIT; + wakeup(&p->p_lflag); + } + if (locked == 0) + proc_unlock(p); +} + +void +proc_transend(proc_t p, int locked) +{ + if (locked == 0) + proc_lock(p); + + p->p_lflag &= ~( P_LINTRANSIT | P_LTRANSCOMMIT); + p->p_transholder = NULL; + + if ((p->p_lflag & P_LTRANSWAIT) == P_LTRANSWAIT) { + p->p_lflag &= ~P_LTRANSWAIT; + wakeup(&p->p_lflag); + } + if (locked == 0) + proc_unlock(p); +} + +int +proc_transwait(proc_t p, int locked) +{ + if (locked == 0) + proc_lock(p); + while ((p->p_lflag & P_LINTRANSIT) == P_LINTRANSIT) { + if ((p->p_lflag & P_LTRANSCOMMIT) == P_LTRANSCOMMIT && current_proc() == p) { + if (locked == 0) + proc_unlock(p); + return EDEADLK; + } + p->p_lflag |= P_LTRANSWAIT; + msleep(&p->p_lflag, &p->p_mlock, 0, "proc_signstart", NULL); + } + if (locked == 0) + proc_unlock(p); + return 0; +} + +void +proc_klist_lock(void) +{ + lck_mtx_lock(proc_klist_mlock); +} + +void +proc_klist_unlock(void) +{ + lck_mtx_unlock(proc_klist_mlock); +} + +void +proc_knote(struct proc * p, long hint) +{ + proc_klist_lock(); + KNOTE(&p->p_klist, hint); + proc_klist_unlock(); +} + +void +proc_knote_drain(struct proc *p) +{ + struct knote *kn = NULL; + + /* + * Clear the proc's klist to avoid references after the proc is reaped. + */ + proc_klist_lock(); + while ((kn = SLIST_FIRST(&p->p_klist))) { + kn->kn_ptr.p_proc = PROC_NULL; + KNOTE_DETACH(&p->p_klist, kn); + } + proc_klist_unlock(); +} + +void +proc_setregister(proc_t p) +{ + proc_lock(p); + p->p_lflag |= P_LREGISTER; + proc_unlock(p); +} + +void +proc_resetregister(proc_t p) +{ + proc_lock(p); + p->p_lflag &= ~P_LREGISTER; + proc_unlock(p); +} + +pid_t +proc_pgrpid(proc_t p) +{ + return p->p_pgrpid; +} + +pid_t +proc_selfpgrpid() +{ + return current_proc()->p_pgrpid; +} + + +/* return control and action states */ +int +proc_getpcontrol(int pid, int * pcontrolp) +{ + proc_t p; + + p = proc_find(pid); + if (p == PROC_NULL) + return(ESRCH); + if (pcontrolp != NULL) + *pcontrolp = p->p_pcaction; + + proc_rele(p); + return(0); +} + +int +proc_dopcontrol(proc_t p) +{ + int pcontrol; + + proc_lock(p); + + pcontrol = PROC_CONTROL_STATE(p); + + if (PROC_ACTION_STATE(p) == 0) { + switch(pcontrol) { + case P_PCTHROTTLE: + PROC_SETACTION_STATE(p); + proc_unlock(p); + printf("low swap: throttling pid %d (%s)\n", p->p_pid, p->p_comm); + break; + + case P_PCSUSP: + PROC_SETACTION_STATE(p); + proc_unlock(p); + printf("low swap: suspending pid %d (%s)\n", p->p_pid, p->p_comm); + task_suspend(p->task); + break; + + case P_PCKILL: + PROC_SETACTION_STATE(p); + proc_unlock(p); + printf("low swap: killing pid %d (%s)\n", p->p_pid, p->p_comm); + psignal(p, SIGKILL); + break; + + default: + proc_unlock(p); + } + + } else + proc_unlock(p); + + return(PROC_RETURNED); +} + + +/* + * Resume a throttled or suspended process. This is an internal interface that's only + * used by the user level code that presents the GUI when we run out of swap space and + * hence is restricted to processes with superuser privileges. + */ + +int +proc_resetpcontrol(int pid) +{ + proc_t p; + int pcontrol; + int error; + proc_t self = current_proc(); + + /* if the process has been validated to handle resource control or root is valid one */ + if (((self->p_lflag & P_LVMRSRCOWNER) == 0) && (error = suser(kauth_cred_get(), 0))) + return error; + + p = proc_find(pid); + if (p == PROC_NULL) + return(ESRCH); + + proc_lock(p); + + pcontrol = PROC_CONTROL_STATE(p); + + if(PROC_ACTION_STATE(p) !=0) { + switch(pcontrol) { + case P_PCTHROTTLE: + PROC_RESETACTION_STATE(p); + proc_unlock(p); + printf("low swap: unthrottling pid %d (%s)\n", p->p_pid, p->p_comm); + break; + + case P_PCSUSP: + PROC_RESETACTION_STATE(p); + proc_unlock(p); + printf("low swap: resuming pid %d (%s)\n", p->p_pid, p->p_comm); + task_resume(p->task); + break; + + case P_PCKILL: + /* Huh? */ + PROC_SETACTION_STATE(p); + proc_unlock(p); + printf("low swap: attempt to unkill pid %d (%s) ignored\n", p->p_pid, p->p_comm); + break; + + default: + proc_unlock(p); + } + + } else + proc_unlock(p); + + proc_rele(p); + return(0); +} + + + +struct no_paging_space +{ + uint64_t pcs_max_size; + uint64_t pcs_uniqueid; + int pcs_pid; + int pcs_proc_count; + uint64_t pcs_total_size; + + uint64_t npcs_max_size; + uint64_t npcs_uniqueid; + int npcs_pid; + int npcs_proc_count; + uint64_t npcs_total_size; + + int apcs_proc_count; + uint64_t apcs_total_size; +}; + + +static int +proc_pcontrol_filter(proc_t p, void *arg) +{ + struct no_paging_space *nps; + uint64_t compressed; + + nps = (struct no_paging_space *)arg; + + compressed = get_task_compressed(p->task); + + if (PROC_CONTROL_STATE(p)) { + if (PROC_ACTION_STATE(p) == 0) { + if (compressed > nps->pcs_max_size) { + nps->pcs_pid = p->p_pid; + nps->pcs_uniqueid = p->p_uniqueid; + nps->pcs_max_size = compressed; + } + nps->pcs_total_size += compressed; + nps->pcs_proc_count++; + } else { + nps->apcs_total_size += compressed; + nps->apcs_proc_count++; + } + } else { + if (compressed > nps->npcs_max_size) { + nps->npcs_pid = p->p_pid; + nps->npcs_uniqueid = p->p_uniqueid; + nps->npcs_max_size = compressed; + } + nps->npcs_total_size += compressed; + nps->npcs_proc_count++; + + } + return (0); +} + + +static int +proc_pcontrol_null(__unused proc_t p, __unused void *arg) +{ + return(PROC_RETURNED); +} + + +/* + * Deal with the low on compressor pool space condition... this function + * gets called when we are approaching the limits of the compressor pool or + * we are unable to create a new swap file. + * Since this eventually creates a memory deadlock situtation, we need to take action to free up + * memory resources (both compressed and uncompressed) in order to prevent the system from hanging completely. + * There are 2 categories of processes to deal with. Those that have an action + * associated with them by the task itself and those that do not. Actionable + * tasks can have one of three categories specified: ones that + * can be killed immediately, ones that should be suspended, and ones that should + * be throttled. Processes that do not have an action associated with them are normally + * ignored unless they are utilizing such a large percentage of the compressor pool (currently 50%) + * that only by killing them can we hope to put the system back into a usable state. + */ + +#define NO_PAGING_SPACE_DEBUG 0 + +extern uint64_t vm_compressor_pages_compressed(void); + +struct timeval last_no_space_action = {0, 0}; + +int +no_paging_space_action() +{ + proc_t p; + struct no_paging_space nps; + struct timeval now; + + /* + * Throttle how often we come through here. Once every 5 seconds should be plenty. + */ + microtime(&now); + + if (now.tv_sec <= last_no_space_action.tv_sec + 5) + return (0); + + /* + * Examine all processes and find the biggest (biggest is based on the number of pages this + * task has in the compressor pool) that has been marked to have some action + * taken when swap space runs out... we also find the biggest that hasn't been marked for + * action. + * + * If the biggest non-actionable task is over the "dangerously big" threashold (currently 50% of + * the total number of pages held by the compressor, we go ahead and kill it since no other task + * can have any real effect on the situation. Otherwise, we go after the actionable process. + */ + bzero(&nps, sizeof(nps)); + + proc_iterate(PROC_ALLPROCLIST, proc_pcontrol_null, (void *)NULL, proc_pcontrol_filter, (void *)&nps); + +#if NO_PAGING_SPACE_DEBUG + printf("low swap: npcs_proc_count = %d, npcs_total_size = %qd, npcs_max_size = %qd\n", + nps.npcs_proc_count, nps.npcs_total_size, nps.npcs_max_size); + printf("low swap: pcs_proc_count = %d, pcs_total_size = %qd, pcs_max_size = %qd\n", + nps.pcs_proc_count, nps.pcs_total_size, nps.pcs_max_size); + printf("low swap: apcs_proc_count = %d, apcs_total_size = %qd\n", + nps.apcs_proc_count, nps.apcs_total_size); +#endif + if (nps.npcs_max_size > (vm_compressor_pages_compressed() * 50) / 100) { + /* + * for now we'll knock out any task that has more then 50% of the pages + * held by the compressor + */ + if ((p = proc_find(nps.npcs_pid)) != PROC_NULL) { + + if (nps.npcs_uniqueid == p->p_uniqueid) { + /* + * verify this is still the same process + * in case the proc exited and the pid got reused while + * we were finishing the proc_iterate and getting to this point + */ + last_no_space_action = now; + + printf("low swap: killing pid %d (%s)\n", p->p_pid, p->p_comm); + psignal(p, SIGKILL); + + proc_rele(p); + + return (0); + } + + proc_rele(p); + } + } + + if (nps.pcs_max_size > 0) { + if ((p = proc_find(nps.pcs_pid)) != PROC_NULL) { + + if (nps.pcs_uniqueid == p->p_uniqueid) { + /* + * verify this is still the same process + * in case the proc exited and the pid got reused while + * we were finishing the proc_iterate and getting to this point + */ + last_no_space_action = now; + + proc_dopcontrol(p); + + proc_rele(p); + + return (1); + } + + proc_rele(p); + } + } + last_no_space_action = now; + + printf("low swap: unable to find any eligible processes to take action on\n"); + + return (0); +} + +int +proc_trace_log(__unused proc_t p, struct proc_trace_log_args *uap, __unused int *retval) +{ + int ret = 0; + proc_t target_proc = PROC_NULL; + pid_t target_pid = uap->pid; + uint64_t target_uniqueid = uap->uniqueid; + task_t target_task = NULL; + + if (priv_check_cred(kauth_cred_get(), PRIV_PROC_TRACE_INSPECT, 0)) { + ret = EPERM; + goto out; + } + target_proc = proc_find(target_pid); + if (target_proc != PROC_NULL) { + if (target_uniqueid != proc_uniqueid(target_proc)) { + ret = ENOENT; + goto out; + } + + target_task = proc_task(target_proc); + if (task_send_trace_memory(target_task, target_pid, target_uniqueid)) { + ret = EINVAL; + goto out; + } + } else + ret = ENOENT; + +out: + if (target_proc != PROC_NULL) + proc_rele(target_proc); + return (ret); +} + +#if VM_SCAN_FOR_SHADOW_CHAIN +extern int vm_map_shadow_max(vm_map_t map); +int proc_shadow_max(void); +int proc_shadow_max(void) +{ + int retval, max; + proc_t p; + task_t task; + vm_map_t map; + + max = 0; + proc_list_lock(); + for (p = allproc.lh_first; (p != 0); p = p->p_list.le_next) { + if (p->p_stat == SIDL) + continue; + task = p->task; + if (task == NULL) { + continue; + } + map = get_task_map(task); + if (map == NULL) { + continue; + } + retval = vm_map_shadow_max(map); + if (retval > max) { + max = retval; + } + } + proc_list_unlock(); + return max; +} +#endif /* VM_SCAN_FOR_SHADOW_CHAIN */ + +void proc_set_responsible_pid(proc_t target_proc, pid_t responsible_pid); +void proc_set_responsible_pid(proc_t target_proc, pid_t responsible_pid) +{ + if (target_proc != NULL) { + target_proc->p_responsible_pid = responsible_pid; + } + return; +} + +int +proc_chrooted(proc_t p) +{ + int retval = 0; + + if (p) { + proc_fdlock(p); + retval = (p->p_fd->fd_rdir != NULL) ? 1 : 0; + proc_fdunlock(p); + } + + return retval; +} + +void * +proc_get_uthread_uu_threadlist(void * uthread_v) +{ + uthread_t uth = (uthread_t)uthread_v; + return (uth != NULL) ? uth->uu_threadlist : NULL; }