X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/9bccf70c0258c7cac2dcb80011b2a964d884c552..c910b4d9d2451126ae3917b931cd4390c11e1d52:/bsd/kern/kern_exit.c diff --git a/bsd/kern/kern_exit.c b/bsd/kern/kern_exit.c index 3f6aa7236..a8e9ef7f0 100644 --- a/bsd/kern/kern_exit.c +++ b/bsd/kern/kern_exit.c @@ -1,23 +1,29 @@ /* - * Copyright (c) 2000-2001 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2007 Apple Inc. All rights reserved. * - * @APPLE_LICENSE_HEADER_START@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * - * The contents of this file constitute Original Code as defined in and - * are subject to the Apple Public Source License Version 1.1 (the - * "License"). You may not use this file except in compliance with the - * License. Please obtain a copy of the License at - * http://www.apple.com/publicsource and read it before using this file. + * 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. 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. * - * This Original Code and all software distributed under the License are - * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER + * 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 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the - * License for the specific language governing rights and limitations - * under the License. + * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. + * 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, 1997 Apple Computer, Inc. All Rights Reserved */ /* @@ -59,6 +65,12 @@ * * @(#)kern_exit.c 8.7 (Berkeley) 2/12/94 */ +/* + * 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. + */ #include #include @@ -68,50 +80,115 @@ #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 /* fdfree */ +#if SYSV_SHM +#include /* shmexit */ +#endif +#include /* acct_process */ + +#include +#include #include + +#include +#include +#include #include -#include +#include #include #include -#if KTRACE -#include +#if CONFIG_DTRACE +/* Do not include dtrace.h, it redefines kmem_[alloc/free] */ +extern void (*dtrace_fasttrap_exit_ptr)(proc_t); +extern void (*dtrace_helpers_cleanup)(proc_t); +extern void dtrace_lazy_dofs_destroy(proc_t); + +#include #endif +#if CONFIG_MACF +#include +#include +#endif + +#include +#include +#include +#include /* init_process */ + +#include + extern char init_task_failure_data[]; -int exit1 __P((struct proc *, int, int *)); +void proc_prepareexit(proc_t p, int rv); +void vfork_exit(proc_t p, int rv); +void vproc_exit(proc_t p); +__private_extern__ void munge_rusage(struct rusage *a_rusage_p, struct user_rusage *a_user_rusage_p); +static int reap_child_locked(proc_t parent, proc_t child, int deadparent, int locked, int droplock); + +/* + * Things which should have prototypes in headers, but don't + */ +void *get_bsduthreadarg(thread_t); +void proc_exit(proc_t p); +int wait1continue(int result); +int waitidcontinue(int result); +int *get_bsduthreadrval(thread_t); +kern_return_t sys_perf_notify(thread_t thread, int pid); +kern_return_t abnormal_exit_notify(mach_exception_data_type_t code, + mach_exception_data_type_t subcode); +int in_shutdown(void); +void workqueue_exit(struct proc *); +void delay(int); + +/* + * NOTE: Source and target may *NOT* overlap! + * XXX Should share code with bsd/dev/ppc/unix_signal.c + */ +static void +siginfo_64to32(user_siginfo_t *in, siginfo_t *out) +{ + out->si_signo = in->si_signo; + out->si_errno = in->si_errno; + out->si_code = in->si_code; + out->si_pid = in->si_pid; + out->si_uid = in->si_uid; + out->si_status = in->si_status; + out->si_addr = CAST_DOWN(void *,in->si_addr); + /* following cast works for sival_int because of padding */ + out->si_value.sival_ptr = CAST_DOWN(void *,in->si_value.sival_ptr); + out->si_band = in->si_band; /* range reduction */ + out->__pad[0] = in->pad[0]; /* mcontext.ss.r1 */ +} /* * exit -- * Death of process. */ -struct exit_args { - int rval; -}; void -exit(p, uap, retval) - struct proc *p; - struct exit_args *uap; - int *retval; +exit(proc_t p, struct exit_args *uap, int *retval) { exit1(p, W_EXITCODE(uap->rval, 0), retval); /* drop funnel before we return */ - thread_funnel_set(kernel_flock, FALSE); thread_exception_return(); /* NOTREACHED */ while (TRUE) @@ -125,16 +202,10 @@ exit(p, uap, retval) * status and rusage for wait(). Check for child processes and orphan them. */ int -exit1(p, rv, retval) - register struct proc *p; - int rv; - int * retval; +exit1(proc_t p, int rv, int *retval) { - register struct proc *q, *nq; thread_t self = current_thread(); - thread_act_t th_act_self = current_act(); struct task *task = p->task; - register int i,s; struct uthread *ut; /* @@ -143,70 +214,96 @@ exit1(p, rv, retval) * right here. */ - ut = get_bsdthread_info(th_act_self); - if (ut->uu_flag & P_VFORK) { - (void)vfork_exit(p, rv); - vfork_return(th_act_self, p->p_pptr, p , retval); + ut = get_bsdthread_info(self); + if (ut->uu_flag & UT_VFORK) { + vfork_exit(p, rv); + vfork_return(p , retval, p->p_pid); unix_syscall_return(0); /* NOT REACHED */ } - signal_lock(p); + + /* + * The parameter list of audit_syscall_exit() was augmented to + * take the Darwin syscall number as the first parameter, + * which is currently required by mac_audit_postselect(). + */ + + AUDIT_SYSCALL_EXIT(SYS_exit, p, ut, 0); /* Exit is always successfull */ + + DTRACE_PROC1(exit, int, CLD_EXITED); + + proc_lock(p); while (p->exit_thread != self) { if (sig_try_locked(p) <= 0) { - if (get_threadtask(th_act_self) != task) { - signal_unlock(p); + if (get_threadtask(self) != task) { + proc_unlock(p); return(0); } - signal_unlock(p); - thread_terminate(th_act_self); - thread_funnel_set(kernel_flock, FALSE); + proc_unlock(p); + thread_terminate(self); thread_exception_return(); /* NOTREACHED */ } sig_lock_to_exit(p); } - signal_unlock(p); - if (p->p_pid == 1) { + if (p == initproc) { + proc_unlock(p); printf("pid 1 exited (signal %d, exit %d)", WTERMSIG(rv), WEXITSTATUS(rv)); - panic("init died\nState at Last Exception:\n\n%s", + panic("%s died\nState at Last Exception:\n\n%s", + (p->p_comm[0] != '\0' ? + p->p_comm : + "launchd"), init_task_failure_data); } - s = splsched(); - p->p_flag |= P_WEXIT; - splx(s); - (void)proc_prepareexit(p); + p->p_lflag |= P_LEXIT; p->p_xstat = rv; + proc_unlock(p); + + proc_prepareexit(p, rv); + /* task terminate will call proc_terminate and that cleans it up */ task_terminate_internal(task); - /* - * we come back and returns to AST which - * should cleanup the rest - */ -#if 0 - if (task == current_task()) { - thread_exception_return(); - /*NOTREACHED*/ - } - - while (task == current_task()) { - thread_terminate_self(); - /*NOTREACHED*/ - } -#endif return(0); } void -proc_prepareexit(struct proc *p) +proc_prepareexit(proc_t p, int rv) { - int s; + mach_exception_data_type_t code, subcode; struct uthread *ut; thread_t self = current_thread(); - thread_act_t th_act_self = current_act(); + ut = get_bsdthread_info(self); + + /* If a core should be generated, notify crash reporter */ + if (!in_shutdown() && hassigprop(WTERMSIG(rv), SA_CORE)) { + /* + * Workaround for processes checking up on PT_DENY_ATTACH: + * should be backed out post-Leopard (details in 5431025). + */ + if ((SIGSEGV == WTERMSIG(rv)) && + (p->p_pptr->p_lflag & P_LNOATTACH)) { + goto skipcheck; + } + + /* + * Crash Reporter looks for the signal value, original exception + * type, and low 20 bits of the original code in code[0] + * (8, 4, and 20 bits respectively). code[1] is unmodified. + */ + code = ((WTERMSIG(rv) & 0xff) << 24) | + ((ut->uu_exception & 0x0f) << 20) | + ((int)ut->uu_code & 0xfffff); + subcode = ut->uu_subcode; + (void) abnormal_exit_notify(code, subcode); + } + +skipcheck: + /* Notify the perf server */ + (void)sys_perf_notify(self, p->p_pid); /* * Remove proc from allproc queue and from pidhash chain. @@ -214,66 +311,146 @@ proc_prepareexit(struct proc *p) * Not doing causes things like mount() find this on allproc * in partially cleaned state. */ + + proc_list_lock(); + LIST_REMOVE(p, p_list); - LIST_REMOVE(p, p_hash); + LIST_INSERT_HEAD(&zombproc, p, p_list); /* Place onto zombproc. */ + /* will not be visible via proc_find */ + p->p_listflag |= P_LIST_EXITED; + + proc_list_unlock(); + #ifdef PGINPROF vmsizmon(); #endif /* * If parent is waiting for us to exit or exec, - * P_PPWAIT is set; we will wakeup the parent below. + * P_LPPWAIT is set; we will wakeup the parent below. */ - p->p_flag &= ~(P_TRACED | P_PPWAIT); - p->p_sigignore = ~0; - p->p_siglist = 0; - ut = get_bsdthread_info(th_act_self); + proc_lock(p); + p->p_lflag &= ~(P_LTRACED | P_LPPWAIT); + p->p_sigignore = ~(sigcantmask); ut->uu_siglist = 0; - untimeout(realitexpire, (caddr_t)p->p_pid); + proc_unlock(p); } void -proc_exit(struct proc *p) +proc_exit(proc_t p) { - register struct proc *q, *nq, *pp; - thread_t self = current_thread(); - thread_act_t th_act_self = current_act(); + proc_t q; + proc_t pp; struct task *task = p->task; - register int i,s; - boolean_t funnel_state; + boolean_t fstate; + vnode_t tvp = NULLVP; + struct pgrp * pg; + struct session *sessp; + struct uthread * uth; /* This can happen if thread_terminate of the single thread * process */ - funnel_state = thread_funnel_set(kernel_flock, TRUE); - if( !(p->p_flag & P_WEXIT)) { - s = splsched(); - p->p_flag |= P_WEXIT; - splx(s); - proc_prepareexit(p); + uth = (struct uthread *)get_bsdthread_info(current_thread()); + + proc_lock(p); + if( !(p->p_lflag & P_LEXIT)) { + p->p_lflag |= P_LEXIT; + proc_unlock(p); + proc_prepareexit(p, 0); + proc_lock(p); } + p->p_lflag |= P_LPEXIT; + proc_unlock(p); + +#if CONFIG_DTRACE + /* + * Free any outstanding lazy dof entries. It is imperative we + * always call dtrace_lazy_dofs_destroy, rather than null check + * and call if !NULL. If we NULL test, during lazy dof faulting + * we can race with the faulting code and proceed from here to + * beyond the helpers cleanup. The lazy dof faulting will then + * install new helpers which will never be cleaned up, and leak. + */ + dtrace_lazy_dofs_destroy(p); + + /* + * Clean up any DTrace helper actions or probes for the process. + */ + if (p->p_dtrace_helpers != NULL) { + (*dtrace_helpers_cleanup)(p); + } + + /* + * Clean up any DTrace probes associated with this process. + */ + /* + * APPLE NOTE: We release ptss pages/entries in dtrace_fasttrap_exit_ptr(), + * call this after dtrace_helpers_cleanup() + */ + proc_lock(p); + if (p->p_dtrace_probes && dtrace_fasttrap_exit_ptr) { + (*dtrace_fasttrap_exit_ptr)(p); + } + proc_unlock(p); +#endif + + /* XXX Zombie allocation may fail, in which case stats get lost */ MALLOC_ZONE(p->p_ru, struct rusage *, sizeof (*p->p_ru), M_ZOMBIE, M_WAITOK); + /* + * need to cancel async IO requests that can be cancelled and wait for those + * already active. MAY BLOCK! + */ + + proc_refdrain(p); + + workqueue_exit(p); + + _aio_exit( p ); + /* * Close open files and release open-file table. * This may block! */ fdfree(p); + if (uth->uu_lowpri_window) { + /* + * task is marked as a low priority I/O type + * and the I/O we issued while flushing files on close + * collided with normal I/O operations... + * no need to throttle this thread since its going away + * but we do need to update our bookeeping w/r to throttled threads + */ + throttle_lowpri_io(FALSE); + } + +#if SYSV_SHM /* Close ref SYSV Shared memory*/ if (p->vm_shm) shmexit(p); +#endif +#if SYSV_SEM /* Release SYSV semaphores */ semexit(p); +#endif - if (SESS_LEADER(p)) { - register struct session *sp = p->p_session; + sessp = proc_session(p); + if (SESS_LEADER(p, sessp)) { - if (sp->s_ttyvp) { + /* Protected by funnel for tty accesses */ + fstate = thread_funnel_set(kernel_flock, TRUE); + + if (sessp->s_ttyvp != NULLVP) { struct vnode *ttyvp; + int ttyvid; + struct vfs_context context; + struct tty * tp; + /* * Controlling process. @@ -281,103 +458,162 @@ proc_exit(struct proc *p) * drain controlling terminal * and revoke access to controlling terminal. */ - if (sp->s_ttyp->t_session == sp) { - if (sp->s_ttyp->t_pgrp) - pgsignal(sp->s_ttyp->t_pgrp, SIGHUP, 1); - (void) ttywait(sp->s_ttyp); + tp = sessp->s_ttyp; + + if ((tp != TTY_NULL) && (tp->t_session == sessp)) { + tty_pgsignal(tp, SIGHUP, 1); + (void) ttywait(tp); /* * The tty could have been revoked * if we blocked. */ - if (sp->s_ttyvp) - VOP_REVOKE(sp->s_ttyvp, REVOKEALL); + + session_lock(sessp); + ttyvp = sessp->s_ttyvp; + ttyvid = sessp->s_ttyvid; + sessp->s_ttyvp = NULL; + sessp->s_ttyvid = 0; + sessp->s_ttyp = NULL; + sessp->s_ttypgrpid = NO_PID; + session_unlock(sessp); + + if ((ttyvp != NULLVP) && (vnode_getwithvid(ttyvp, ttyvid) == 0)) { + context.vc_thread = proc_thread(p); /* XXX */ + context.vc_ucred = kauth_cred_proc_ref(p); + VNOP_REVOKE(ttyvp, REVOKEALL, &context); + vnode_put(ttyvp); + kauth_cred_unref(&context.vc_ucred); + } + } else { + session_lock(sessp); + ttyvp = sessp->s_ttyvp; + sessp->s_ttyvp = NULL; + sessp->s_ttyvid = 0; + sessp->s_ttyp = NULL; + sessp->s_ttypgrpid = NO_PID; + session_unlock(sessp); } - ttyvp = sp->s_ttyvp; - sp->s_ttyvp = NULL; if (ttyvp) - vrele(ttyvp); + vnode_rele(ttyvp); /* * s_ttyp is not zero'd; we use this to indicate * that the session once had a controlling terminal. * (for logging and informational purposes) */ } - sp->s_leader = NULL; + + (void) thread_funnel_set(kernel_flock, fstate); + session_lock(sessp); + sessp->s_leader = NULL; + session_unlock(sessp); } + session_rele(sessp); + + pg = proc_pgrp(p); + fixjobc(p, pg, 0); + pg_rele(pg); - fixjobc(p, p->p_pgrp, 0); p->p_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; (void)acct_process(p); -#if KTRACE - /* - * release trace file - */ - p->p_traceflag = 0; /* don't trace the vrele() */ - if (p->p_tracep) { - struct vnode *tvp = p->p_tracep; - p->p_tracep = NULL; - vrele(tvp); + proc_list_lock(); + /* wait till parentrefs are dropped and grant no more */ + proc_childdrainstart(p); + while ((q = p->p_children.lh_first) != NULL) { + q->p_listflag |= P_LIST_DEADPARENT; + if (q->p_stat == SZOMB) { + if (p != q->p_pptr) + panic("parent child linkage broken"); + /* check for sysctl zomb lookup */ + while ((q->p_listflag & P_LIST_WAITING) == P_LIST_WAITING) { + msleep(&q->p_stat, proc_list_mlock, PWAIT, "waitcoll", 0); + } + q->p_listflag |= P_LIST_WAITING; + /* + * This is a named reference and it is not granted + * if the reap is already in progress. So we get + * the reference here exclusively and their can be + * no waiters. So there is no need for a wakeup + * after we are done. AlsO the reap frees the structure + * and the proc struct cannot be used for wakeups as well. + * It is safe to use q here as this is system reap + */ + (void)reap_child_locked(p, q, 1, 1, 0); + } else { + proc_reparentlocked(q, initproc, 0, 1); + /* + * Traced processes are killed + * since their existence means someone is messing up. + */ + if (q->p_lflag & P_LTRACED) { + proc_list_unlock(); + proc_lock(q); + q->p_lflag &= ~P_LTRACED; + if (q->sigwait_thread) { + proc_unlock(q); + /* + * The sigwait_thread could be stopped at a + * breakpoint. Wake it up to kill. + * Need to do this as it could be a thread which is not + * the first thread in the task. So any attempts to kill + * the process would result into a deadlock on q->sigwait. + */ + thread_resume((thread_t)q->sigwait_thread); + clear_wait(q->sigwait_thread, THREAD_INTERRUPTED); + threadsignal((thread_t)q->sigwait_thread, SIGKILL, 0); + } else + proc_unlock(q); + psignal(q, SIGKILL); + proc_list_lock(); + } + } } -#endif - q = p->p_children.lh_first; - if (q) /* only need this if any child is S_ZOMB */ - wakeup((caddr_t) initproc); - for (; q != 0; q = nq) { - nq = q->p_sibling.le_next; - proc_reparent(q, initproc); - /* - * Traced processes are killed - * since their existence means someone is messing up. - */ - if (q->p_flag & P_TRACED) { - q->p_flag &= ~P_TRACED; - if (q->sigwait_thread) { - thread_t sig_shuttle; + proc_childdrainend(p); + proc_list_unlock(); - sig_shuttle = (thread_t)getshuttle_thread((thread_act_t)q->sigwait_thread); - /* - * The sigwait_thread could be stopped at a - * breakpoint. Wake it up to kill. - * Need to do this as it could be a thread which is not - * the first thread in the task. So any attempts to kill - * the process would result into a deadlock on q->sigwait. - */ - thread_resume((thread_act_t)q->sigwait_thread); - clear_wait(sig_shuttle, THREAD_INTERRUPTED); - threadsignal((thread_act_t)q->sigwait_thread, SIGKILL, 0); - } - psignal(q, SIGKILL); - } + /* + * Release reference to text vnode + */ + tvp = p->p_textvp; + p->p_textvp = NULL; + if (tvp != NULLVP) { + vnode_rele(tvp); } /* * Save exit status and final rusage info, adding in child rusage - * info and self times. + * info and self times. If we were unable to allocate a zombie + * structure, this information is lost. */ - *p->p_ru = p->p_stats->p_ru; + /* No need for locking here as no one than this thread can access this */ + if (p->p_ru != NULL) { + *p->p_ru = p->p_stats->p_ru; - timerclear(&p->p_ru->ru_utime); - timerclear(&p->p_ru->ru_stime); + timerclear(&p->p_ru->ru_utime); + timerclear(&p->p_ru->ru_stime); - if (task) { - task_basic_info_data_t tinfo; + if (task) { + task_basic_info_32_data_t tinfo; task_thread_times_info_data_t ttimesinfo; - int task_info_stuff, task_ttimes_stuff; + task_events_info_data_t teventsinfo; + mach_msg_type_number_t task_info_stuff, task_ttimes_stuff; + mach_msg_type_number_t task_events_stuff; struct timeval ut,st; - task_info_stuff = TASK_BASIC_INFO_COUNT; - task_info(task, TASK_BASIC_INFO, - &tinfo, &task_info_stuff); + task_info_stuff = TASK_BASIC_INFO_32_COUNT; + task_info(task, TASK_BASIC2_INFO_32, + (task_info_t)&tinfo, &task_info_stuff); p->p_ru->ru_utime.tv_sec = tinfo.user_time.seconds; p->p_ru->ru_utime.tv_usec = tinfo.user_time.microseconds; p->p_ru->ru_stime.tv_sec = tinfo.system_time.seconds; p->p_ru->ru_stime.tv_usec = tinfo.system_time.microseconds; + p->p_ru->ru_maxrss = tinfo.resident_size; + task_ttimes_stuff = TASK_THREAD_TIMES_INFO_COUNT; task_info(task, TASK_THREAD_TIMES_INFO, - &ttimesinfo, &task_ttimes_stuff); + (task_info_t)&ttimesinfo, &task_ttimes_stuff); ut.tv_sec = ttimesinfo.user_time.seconds; ut.tv_usec = ttimesinfo.user_time.microseconds; @@ -385,9 +621,22 @@ proc_exit(struct proc *p) st.tv_usec = ttimesinfo.system_time.microseconds; timeradd(&ut,&p->p_ru->ru_utime,&p->p_ru->ru_utime); timeradd(&st,&p->p_ru->ru_stime,&p->p_ru->ru_stime); - } - ruadd(p->p_ru, &p->p_stats->p_cru); + task_events_stuff = TASK_EVENTS_INFO_COUNT; + task_info(task, TASK_EVENTS_INFO, + (task_info_t)&teventsinfo, &task_events_stuff); + + p->p_ru->ru_minflt = (teventsinfo.faults - + teventsinfo.pageins); + p->p_ru->ru_majflt = teventsinfo.pageins; + p->p_ru->ru_nivcsw = (teventsinfo.csw - + p->p_ru->ru_nvcsw); + if (p->p_ru->ru_nivcsw < 0) + p->p_ru->ru_nivcsw = 0; + } + + ruadd(p->p_ru, &p->p_stats->p_cru); + } /* * Free up profiling buffers. @@ -401,325 +650,812 @@ proc_exit(struct proc *p) for (; p1 != NULL; p1 = pn) { pn = p1->pr_next; - kfree((vm_offset_t)p1, sizeof *p1); + kfree(p1, sizeof *p1); } } + proc_spinlock(p); + if (thread_call_cancel(p->p_rcall)) + p->p_ractive--; + + while (p->p_ractive > 0) { + proc_spinunlock(p); + + delay(1); + + proc_spinlock(p); + } + proc_spinunlock(p); + + thread_call_free(p->p_rcall); + p->p_rcall = NULL; + /* * Other substructures are freed from wait(). */ - FREE_ZONE(p->p_stats, sizeof *p->p_stats, M_SUBPROC); + FREE_ZONE(p->p_stats, sizeof *p->p_stats, M_PSTATS); p->p_stats = NULL; - FREE_ZONE(p->p_sigacts, sizeof *p->p_sigacts, M_SUBPROC); + FREE_ZONE(p->p_sigacts, sizeof *p->p_sigacts, M_SIGACTS); p->p_sigacts = NULL; - if (--p->p_limit->p_refcnt == 0) - FREE_ZONE(p->p_limit, sizeof *p->p_limit, M_SUBPROC); + proc_limitdrop(p, 1); p->p_limit = NULL; + /* * Finish up by terminating the task * and halt this thread (only if a * member of the task exiting). */ p->task = TASK_NULL; - //task->proc = NULL; set_bsdtask_info(task, NULL); + proc_knote(p, NOTE_EXIT); + + /* mark the thread as the one that is doing proc_exit + * no need to hold proc lock in uthread_free + */ + uth->uu_flag |= UT_PROCEXIT; /* * Notify parent that we're gone. */ - if (p->p_pptr->p_flag & P_NOCLDWAIT) { - struct proc * pp = p->p_pptr; + pp = proc_parent(p); + if (pp->p_flag & P_NOCLDWAIT) { - proc_reparent(p, initproc); - /* If there are no more children wakeup parent */ - if (LIST_EMPTY(&pp->p_children)) - wakeup((caddr_t)pp); +#if 3839178 + /* + * If the parent is ignoring SIGCHLD, then POSIX requires + * us to not add the resource usage to the parent process - + * we are only going to hand it off to init to get reaped. + * We should contest the standard in this case on the basis + * of RLIMIT_CPU. + */ +#else /* !3839178 */ + /* + * Add child resource usage to parent before giving + * zombie to init. If we were unable to allocate a + * zombie structure, this information is lost. + */ + if (p->p_ru != NULL) { + proc_lock(pp); + ruadd(&pp->p_stats->p_cru, p->p_ru); + proc_unlock(pp); + } +#endif /* !3839178 */ + + /* kernel can reap this one, no need to move it to launchd */ + proc_list_lock(); + p->p_listflag |= P_LIST_DEADPARENT; + proc_list_unlock(); } - /* should be fine as parent proc would be initproc */ - pp = p->p_pptr; - if (pp != initproc) { - pp->si_pid = p->p_pid; - pp->si_status = p->p_xstat; - pp->si_code = CLD_EXITED; - pp->si_uid = p->p_cred->p_ruid; + if ((p->p_listflag & P_LIST_DEADPARENT) == 0) { + if (pp != initproc) { + proc_lock(pp); + pp->si_pid = p->p_pid; + pp->si_status = p->p_xstat; + pp->si_code = CLD_EXITED; + /* + * p_ucred usage is safe as it is an exiting process + * and reference is dropped in reap + */ + pp->si_uid = p->p_ucred->cr_ruid; + proc_unlock(pp); + } + /* mark as a zombie */ + /* No need to take proc lock as all refs are drained and + * no one except parent (reaping ) can look at this. + * The write is to an int and is coherent. Also parent is + * keyed off of list lock for reaping + */ + p->p_stat = SZOMB; + /* + * The current process can be reaped so, no one + * can depend on this + */ + + psignal(pp, SIGCHLD); + + /* and now wakeup the parent */ + proc_list_lock(); + wakeup((caddr_t)pp); + proc_list_unlock(); + } else { + /* should be fine as parent proc would be initproc */ + /* mark as a zombie */ + /* No need to take proc lock as all refs are drained and + * no one except parent (reaping ) can look at this. + * The write is to an int and is coherent. Also parent is + * keyed off of list lock for reaping + */ + proc_list_lock(); + p->p_stat = SZOMB; + /* check for sysctl zomb lookup */ + while ((p->p_listflag & P_LIST_WAITING) == P_LIST_WAITING) { + msleep(&p->p_stat, proc_list_mlock, PWAIT, "waitcoll", 0); + } + /* safe to use p as this is a system reap */ + p->p_listflag |= P_LIST_WAITING; + /* + * This is a named reference and it is not granted + * if the reap is already in progress. So we get + * the reference here exclusively and their can be + * no waiters. So there is no need for a wakeup + * after we are done. AlsO the reap frees the structure + * and the proc struct cannot be used for wakeups as well. + * It is safe to use p here as this is system reap + */ + (void)reap_child_locked(pp, p, 1, 1, 1); + /* list lock dropped by reap_child_locked */ + } + if (uth->uu_lowpri_window) { + /* + * task is marked as a low priority I/O type and we've + * somehow picked up another throttle during exit processing... + * no need to throttle this thread since its going away + * but we do need to update our bookeeping w/r to throttled threads + */ + throttle_lowpri_io(FALSE); } - psignal(pp, SIGCHLD); + proc_rele(pp); - /* Place onto zombproc. */ - LIST_INSERT_HEAD(&zombproc, p, p_list); - p->p_stat = SZOMB; +} - /* and now wakeup the parent */ - wakeup((caddr_t)p->p_pptr); - (void) thread_funnel_set(kernel_flock, funnel_state); -} +/* + * reap_child_locked + * + * Description: Given a process from which all status information needed + * has already been extracted, if the process is a ptrace + * attach process, detach it and give it back to its real + * parent, else recover all resources remaining associated + * with it. + * + * Parameters: proc_t parent Parent of process being reaped + * proc_t child Process to reap + * + * Returns: 0 Process was not reaped because it + * came from an attach + * 1 Process was reaped + */ +static int +reap_child_locked(proc_t parent, proc_t child, int deadparent, int locked, int droplock) +{ + proc_t trace_parent; /* Traced parent process, if tracing */ + /* + * If we got the child via a ptrace 'attach', + * we need to give it back to the old parent. + */ + if (locked == 1) + proc_list_unlock(); + if (child->p_oppid && (trace_parent = proc_find(child->p_oppid))) { + proc_lock(child); + child->p_oppid = 0; + proc_unlock(child); + if (trace_parent != initproc) { + /* + * proc internal fileds and p_ucred usage safe + * here as child is dead and is not reaped or + * reparented yet + */ + proc_lock(trace_parent); + trace_parent->si_pid = child->p_pid; + trace_parent->si_status = child->p_xstat; + trace_parent->si_code = CLD_CONTINUED; + trace_parent->si_uid = child->p_ucred->cr_ruid; + proc_unlock(trace_parent); + } + proc_reparentlocked(child, trace_parent, 1, 0); + psignal(trace_parent, SIGCHLD); + proc_list_lock(); + wakeup((caddr_t)trace_parent); + child->p_listflag &= ~P_LIST_WAITING; + wakeup(&child->p_stat); + proc_list_unlock(); + proc_rele(trace_parent); + if ((locked == 1) && (droplock == 0)) + proc_list_lock(); + return (0); + } -struct wait4_args { - int pid; - int *status; - int options; - struct rusage *rusage; -}; + proc_knote(child, NOTE_REAP); -#if COMPAT_43 -int -owait(p, uap, retval) - struct proc *p; - void *uap; - int *retval; -{ - struct wait4_args *a; + child->p_xstat = 0; + if (child->p_ru) { + proc_lock(parent); +#if 3839178 + /* + * If the parent is ignoring SIGCHLD, then POSIX requires + * us to not add the resource usage to the parent process - + * we are only going to hand it off to init to get reaped. + * We should contest the standard in this case on the basis + * of RLIMIT_CPU. + */ + if (!(parent->p_flag & P_NOCLDWAIT)) +#endif /* 3839178 */ + ruadd(&parent->p_stats->p_cru, child->p_ru); + proc_unlock(parent); + FREE_ZONE(child->p_ru, sizeof *child->p_ru, M_ZOMBIE); + child->p_ru = NULL; + } else { + printf("Warning : lost p_ru for %s\n", child->p_comm); + } - a = (struct wait4_args *)get_bsduthreadarg(current_act()); + /* + * Decrement the count of procs running with this uid. + * p_ucred usage is safe here as it is an exited process. + * and refernce is dropped after these calls down below + * (locking protection is provided by list lock held in chgproccnt) + */ + (void)chgproccnt(child->p_ucred->cr_ruid, -1); - a->options = 0; - a->rusage = NULL; - a->pid = WAIT_ANY; - a->status = NULL; - return (wait1(p, a, retval, 1)); -} +#if CONFIG_LCTX + ALLLCTX_LOCK; + leavelctx(child); + ALLLCTX_UNLOCK; +#endif -int -wait4(p, uap, retval) - struct proc *p; - struct wait4_args *uap; - int *retval; -{ - return (wait1(p, uap, retval, 0)); -} + /* + * Free up credentials. + */ + if (IS_VALID_CRED(child->p_ucred)) { + kauth_cred_unref(&child->p_ucred); + } -struct owait3_args { - int *status; - int options; - struct rusage *rusage; -}; + /* XXXX Note NOT SAFE TO USE p_ucred from this point onwards */ -int -owait3(p, uap, retval) - struct proc *p; - struct owait3_args *uap; - int *retval; -{ - struct wait4_args *a; + /* + * Finally finished with old proc entry. + * Unlink it from its process group and free it. + */ + leavepgrp(child); - a = (struct wait4_args *)get_bsduthreadarg(current_act); + proc_list_lock(); + LIST_REMOVE(child, p_list); /* off zombproc */ + parent->p_childrencnt--; + LIST_REMOVE(child, p_sibling); + /* If there are no more children wakeup parent */ + if ((deadparent != 0) && (LIST_EMPTY(&parent->p_children))) + wakeup((caddr_t)parent); /* with list lock held */ + child->p_listflag &= ~P_LIST_WAITING; + wakeup(&child->p_stat); + + /* Take it out of process hash */ + LIST_REMOVE(child, p_hash); + child->p_listflag &= ~P_LIST_INHASH; + proc_checkdeadrefs(child); + nprocs--; + + proc_list_unlock(); + + lck_mtx_destroy(&child->p_mlock, proc_lck_grp); + lck_mtx_destroy(&child->p_fdmlock, proc_lck_grp); +#if CONFIG_DTRACE + lck_mtx_destroy(&child->p_dtrace_sprlock, proc_lck_grp); +#endif + lck_spin_destroy(&child->p_slock, proc_lck_grp); + workqueue_destroy_lock(child); - a->rusage = uap->rusage; - a->options = uap->options; - a->status = uap->status; - a->pid = WAIT_ANY; + FREE_ZONE(child, sizeof *child, M_PROC); + if ((locked == 1) && (droplock == 0)) + proc_list_lock(); - return (wait1(p, a, retval, 1)); + return (1); } -#else -#define wait1 wait4 -#endif int -wait1continue(result) +wait1continue(int result) { void *vt; - thread_act_t thread; + thread_t thread; int *retval; - struct proc *p; + proc_t p; if (result) return(result); p = current_proc(); - thread = current_act(); - vt = (void *)get_bsduthreadarg(thread); - retval = (int *)get_bsduthreadrval(thread); - wait1((struct proc *)p, (struct wait4_args *)vt, retval, 0); + thread = current_thread(); + vt = get_bsduthreadarg(thread); + retval = get_bsduthreadrval(thread); + return(wait4(p, (struct wait4_args *)vt, retval)); } int -wait1(q, uap, retval, compat) - register struct proc *q; - register struct wait4_args *uap; - register_t *retval; -#if COMPAT_43 - int compat; -#endif +wait4(proc_t q, struct wait4_args *uap, register_t *retval) { - register int nfound; - register struct proc *p, *t; + __pthread_testcancel(1); + return(wait4_nocancel(q, (struct wait4_nocancel_args *)uap, retval)); +} + +int +wait4_nocancel(proc_t q, struct wait4_nocancel_args *uap, register_t *retval) +{ + int nfound; + proc_t p; int status, error; - struct vnode *tvp; -retry: if (uap->pid == 0) - uap->pid = -q->p_pgid; + uap->pid = -q->p_pgrpid; loop: + proc_list_lock(); +loop1: nfound = 0; for (p = q->p_children.lh_first; p != 0; p = p->p_sibling.le_next) { if (uap->pid != WAIT_ANY && p->p_pid != uap->pid && - p->p_pgid != -(uap->pid)) + p->p_pgrpid != -(uap->pid)) continue; + nfound++; - if (p->p_flag & P_WAITING) { - (void)tsleep(&p->p_stat, PWAIT, "waitcoll", 0); - goto loop; + + /* XXX This is racy because we don't get the lock!!!! */ + + if (p->p_listflag & P_LIST_WAITING) { + (void)msleep(&p->p_stat, proc_list_mlock, PWAIT, "waitcoll", 0); + goto loop1; } - p->p_flag |= P_WAITING; /* only allow single thread to wait() */ + p->p_listflag |= P_LIST_WAITING; /* only allow single thread to wait() */ + if (p->p_stat == SZOMB) { - retval[0] = p->p_pid; -#if COMPAT_43 - if (compat) - retval[1] = p->p_xstat; - else + proc_list_unlock(); +#if CONFIG_MACF + if ((error = mac_proc_check_wait(q, p)) != 0) + goto out; #endif + retval[0] = p->p_pid; if (uap->status) { - status = p->p_xstat; /* convert to int */ - if (error = copyout((caddr_t)&status, - (caddr_t)uap->status, - sizeof(status))) { - p->p_flag &= ~P_WAITING; - wakeup(&p->p_stat); - return (error); + /* Legacy apps expect only 8 bits of status */ + status = 0xffff & p->p_xstat; /* convert to int */ + error = copyout((caddr_t)&status, + uap->status, + sizeof(status)); + if (error) + goto out; + } + if (uap->rusage) { + if (p->p_ru == NULL) { + error = ENOMEM; + } else { + if (IS_64BIT_PROCESS(q)) { + struct user_rusage my_rusage; + munge_rusage(p->p_ru, &my_rusage); + error = copyout((caddr_t)&my_rusage, + uap->rusage, + sizeof (my_rusage)); + } + else { + error = copyout((caddr_t)p->p_ru, + uap->rusage, + sizeof (struct rusage)); + } } + /* information unavailable? */ + if (error) + goto out; } - if (uap->rusage && - (error = copyout((caddr_t)p->p_ru, - (caddr_t)uap->rusage, - sizeof (struct rusage)))) { - p->p_flag &= ~P_WAITING; + + /* Clean up */ + if (!reap_child_locked(q, p, 0, 0, 0)) { + proc_list_lock(); + p->p_listflag &= ~P_LIST_WAITING; wakeup(&p->p_stat); - return (error); + proc_list_unlock(); } - /* - * If we got the child via a ptrace 'attach', - * we need to give it back to the old parent. - */ - if (p->p_oppid && (t = pfind(p->p_oppid))) { - p->p_oppid = 0; - proc_reparent(p, t); - if (t != initproc) { - t->si_pid = p->p_pid; - t->si_status = p->p_xstat; - t->si_code = CLD_CONTINUED; - t->si_uid = p->p_cred->p_ruid; - } - psignal(t, SIGCHLD); - wakeup((caddr_t)t); - p->p_flag &= ~P_WAITING; - wakeup(&p->p_stat); - return (0); + + return (0); + } + if (p->p_stat == SSTOP && (p->p_lflag & P_LWAITED) == 0 && + (p->p_lflag & P_LTRACED || uap->options & WUNTRACED)) { + proc_list_unlock(); +#if CONFIG_MACF + if ((error = mac_proc_check_wait(q, p)) != 0) + goto out; +#endif + proc_lock(p); + p->p_lflag |= P_LWAITED; + proc_unlock(p); + retval[0] = p->p_pid; + if (uap->status) { + status = W_STOPCODE(p->p_xstat); + error = copyout((caddr_t)&status, + uap->status, + sizeof(status)); + } else + error = 0; + goto out; + } + /* + * If we are waiting for continued processses, and this + * process was continued + */ + if ((uap->options & WCONTINUED) && + (p->p_flag & P_CONTINUED)) { + proc_list_unlock(); +#if CONFIG_MACF + if ((error = mac_proc_check_wait(q, p)) != 0) + goto out; +#endif + + /* Prevent other process for waiting for this event */ + OSBitAndAtomic(~((uint32_t)P_CONTINUED), (UInt32 *)&p->p_flag); + retval[0] = p->p_pid; + if (uap->status) { + status = W_STOPCODE(SIGCONT); + error = copyout((caddr_t)&status, + uap->status, + sizeof(status)); + } else + error = 0; + goto out; + } + p->p_listflag &= ~P_LIST_WAITING; + wakeup(&p->p_stat); + } + /* list lock is held when we get here any which way */ + if (nfound == 0) { + proc_list_unlock(); + return (ECHILD); + } + + if (uap->options & WNOHANG) { + retval[0] = 0; + proc_list_unlock(); + return (0); + } + + if ((error = msleep0((caddr_t)q, proc_list_mlock, PWAIT | PCATCH | PDROP, "wait", 0, wait1continue))) + return (error); + + goto loop; +out: + proc_list_lock(); + p->p_listflag &= ~P_LIST_WAITING; + wakeup(&p->p_stat); + proc_list_unlock(); + return (error); +} + + +int +waitidcontinue(int result) +{ + void *vt; + thread_t thread; + int *retval; + + if (result) + return(result); + + thread = current_thread(); + vt = get_bsduthreadarg(thread); + retval = get_bsduthreadrval(thread); + return(waitid(current_proc(), (struct waitid_args *)vt, retval)); +} + +/* + * Description: Suspend the calling thread until one child of the process + * containing the calling thread changes state. + * + * Parameters: uap->idtype one of P_PID, P_PGID, P_ALL + * uap->id pid_t or gid_t or ignored + * uap->infop Address of signinfo_t struct in + * user space into which to return status + * uap->options flag values + * + * Returns: 0 Success + * !0 Error returning status to user space + */ +int +waitid(proc_t q, struct waitid_args *uap, register_t *retval) +{ + __pthread_testcancel(1); + return(waitid_nocancel(q, (struct waitid_nocancel_args *)uap, retval)); +} + +int +waitid_nocancel(proc_t q, struct waitid_nocancel_args *uap, __unused register_t *retval) +{ + user_siginfo_t collect64; /* siginfo data to return to caller */ + + int nfound; + proc_t p; + int error; + + /* + * Forced validation of options for T.waitpid 21; should be a TSD! + * This will pass the test, but note that we have more bits than the + * standard specifies that we will allow in, in this case. The test + * passes because they light all the bits, not just the ones we allow, + * and so the following check returns EINVAL like the test wants. + */ + if (((uap->options & (WNOHANG|WNOWAIT|WCONTINUED|WUNTRACED|WSTOPPED|WEXITED)) != uap->options) || + (uap->options == 0)) + return (EINVAL); /* bits set that aren't recognized */ + + /* + * Overly critical options checking, per POSIX + */ + switch(uap->idtype) { + case P_PID: /* child with process ID equal to... */ + case P_PGID: /* child with process group ID equal to... */ + if (((int)uap->id) < 0) + return (EINVAL); + break; + case P_ALL: /* any child */ + break; + } + +loop: + proc_list_lock(); +loop1: + nfound = 0; + for (p = q->p_children.lh_first; p != 0; p = p->p_sibling.le_next) { + switch(uap->idtype) { + case P_PID: /* child with process ID equal to... */ + if (p->p_pid != (pid_t)uap->id) + continue; + break; + case P_PGID: /* child with process group ID equal to... */ + if (p->p_pgrpid != (pid_t)uap->id) + continue; + break; + case P_ALL: /* any child */ + break; + } + + /* XXX This is racy because we don't get the lock!!!! */ + + /* + * Wait collision; go to sleep and restart; used to maintain + * the single return for waited process guarantee. + */ + if (p->p_listflag & P_LIST_WAITING) { + (void)msleep(&p->p_stat, proc_list_mlock, PWAIT, "waitidcoll", 0); + goto loop1; + } + p->p_listflag |= P_LIST_WAITING; /* mark busy */ + + nfound++; + + /* + * Types of processes we are interested in + * + * XXX Don't know what to do for WCONTINUED?!? + */ + switch(p->p_stat) { + case SZOMB: /* Exited */ + if (!(uap->options & WEXITED)) + break; + + /* drop the lock and the thread is going to return */ + proc_list_unlock(); + + /* Collect "siginfo" information for caller */ + collect64.si_signo = SIGCHLD; + collect64.si_code = 0; + collect64.si_errno = 0; + collect64.si_pid = 0; + collect64.si_uid = 0; + collect64.si_addr = 0; + collect64.si_status = WEXITSTATUS(p->p_xstat); + collect64.si_band = 0; + + if (IS_64BIT_PROCESS(p)) { + error = copyout((caddr_t)&collect64, + uap->infop, + sizeof(collect64)); + } else { + siginfo_t collect; + siginfo_64to32(&collect64,&collect); + error = copyout((caddr_t)&collect, + uap->infop, + sizeof(collect)); } - p->p_xstat = 0; - if (p->p_ru) { - ruadd(&q->p_stats->p_cru, p->p_ru); - FREE_ZONE(p->p_ru, sizeof *p->p_ru, M_ZOMBIE); - p->p_ru = NULL; + /* information unavailable? */ + if (error) + goto out; + + /* Prevent other process for waiting for this event? */ + if (!(uap->options & WNOWAIT)) { + /* Clean up */ + if (!reap_child_locked(q, p, 0, 0, 0)) { + proc_list_lock(); + p->p_listflag &= ~P_LIST_WAITING; + wakeup(&p->p_stat); + proc_list_unlock(); + } } else { - printf("Warning : lost p_ru for %s\n", p->p_comm); + proc_list_lock(); + p->p_listflag &= ~P_LIST_WAITING; + proc_list_unlock(); } + return (0); + + case SSTOP: /* Stopped */ /* - * Decrement the count of procs running with this uid. + * If we are not interested in stopped processes, then + * ignore this one. */ - (void)chgproccnt(p->p_cred->p_ruid, -1); + if (!(uap->options & WSTOPPED)) + break; /* - * Free up credentials. + * If someone has already waited it, we lost a race + * to be the one to return status. */ - if (--p->p_cred->p_refcnt == 0) { - struct ucred *ucr = p->p_ucred; - struct pcred *pcr; - - if (ucr != NOCRED) { - p->p_ucred = NOCRED; - crfree(ucr); - } - pcr = p->p_cred; - p->p_cred = NULL; - FREE_ZONE(pcr, sizeof *pcr, M_SUBPROC); + if ((p->p_lflag & P_LWAITED) != 0) + break; + + /* drop the lock and the thread is going to return */ + proc_list_unlock(); + + /* Collect "siginfo" information for caller */ + collect64.si_signo = SIGCHLD; + collect64.si_code = 0; + collect64.si_errno = 0; + collect64.si_pid = 0; + collect64.si_uid = 0; + collect64.si_addr = 0; + proc_lock(p); + collect64.si_status = p->p_xstat; + proc_unlock(p); + collect64.si_band = 0; + + if (IS_64BIT_PROCESS(p)) { + error = copyout((caddr_t)&collect64, + uap->infop, + sizeof(collect64)); + } else { + siginfo_t collect; + siginfo_64to32(&collect64,&collect); + error = copyout((caddr_t)&collect, + uap->infop, + sizeof(collect)); + } + /* information unavailable? */ + if (error) + goto out; + + /* Prevent other process for waiting for this event? */ + if (!(uap->options & WNOWAIT)) { + proc_lock(p); + p->p_lflag |= P_LWAITED; + proc_unlock(p); } - /* - * Release reference to text vnode - */ - tvp = p->p_textvp; - p->p_textvp = NULL; - if (tvp) - vrele(tvp); + error = 0; + goto out; + + default: /* All others */ + /* ...meaning Continued */ + if (!(uap->options & WCONTINUED)) + break; /* - * Finally finished with old proc entry. - * Unlink it from its process group and free it. + * If the flag isn't set, then this process has not + * been stopped and continued, or the status has + * already been reaped by another caller of waitid(). */ - leavepgrp(p); - LIST_REMOVE(p, p_list); /* off zombproc */ - LIST_REMOVE(p, p_sibling); - p->p_flag &= ~P_WAITING; - FREE_ZONE(p, sizeof *p, M_PROC); - nprocs--; - wakeup(&p->p_stat); - return (0); - } - if (p->p_stat == SSTOP && (p->p_flag & P_WAITED) == 0 && - (p->p_flag & P_TRACED || uap->options & WUNTRACED)) { - p->p_flag |= P_WAITED; - retval[0] = p->p_pid; -#if COMPAT_43 - if (compat) { - retval[1] = W_STOPCODE(p->p_xstat); - error = 0; - } else -#endif - if (uap->status) { - status = W_STOPCODE(p->p_xstat); - error = copyout((caddr_t)&status, - (caddr_t)uap->status, - sizeof(status)); - } else - error = 0; - p->p_flag &= ~P_WAITING; - wakeup(&p->p_stat); - return (error); + if ((p->p_flag & P_CONTINUED) == 0) + break; + + /* drop the lock and the thread is going to return */ + proc_list_unlock(); + + /* Collect "siginfo" information for caller */ + proc_lock(p); + collect64.si_signo = SIGCHLD; + collect64.si_code = CLD_CONTINUED; + collect64.si_errno = 0; + collect64.si_pid = p->p_contproc; + collect64.si_uid = 0; + collect64.si_addr = 0; + collect64.si_status = p->p_xstat; + collect64.si_band = 0; + proc_unlock(p); + + if (IS_64BIT_PROCESS(p)) { + error = copyout((caddr_t)&collect64, + uap->infop, + sizeof(collect64)); + } else { + siginfo_t collect; + siginfo_64to32(&collect64,&collect); + error = copyout((caddr_t)&collect, + uap->infop, + sizeof(collect)); + } + /* information unavailable? */ + if (error) + goto out; + + /* Prevent other process for waiting for this event? */ + if (!(uap->options & WNOWAIT)) { + OSBitAndAtomic(~((uint32_t)P_CONTINUED), (UInt32 *)&p->p_flag); + } + + error = 0; + goto out; } - p->p_flag &= ~P_WAITING; + /* LIST LOCK IS HELD HERE */ + /* Not a process we are interested in; go on to next child */ + + p->p_listflag &= ~P_LIST_WAITING; wakeup(&p->p_stat); } - if (nfound == 0) + + /* list lock is always held */ + /* No child processes that could possibly satisfy the request? */ + if (nfound == 0) { + proc_list_unlock(); return (ECHILD); + } if (uap->options & WNOHANG) { - retval[0] = 0; + proc_list_unlock(); return (0); } - if (error = tsleep0((caddr_t)q, PWAIT | PCATCH, "wait", 0, wait1continue)) + if ((error = msleep0((caddr_t)q, proc_list_mlock, PWAIT | PCATCH | PDROP, "waitid", 0, waitidcontinue))) return (error); goto loop; +out: + proc_list_lock(); + p->p_listflag &= ~P_LIST_WAITING; + wakeup(&p->p_stat); + proc_list_unlock(); + return (error); } /* * make process 'parent' the new parent of process 'child'. */ void -proc_reparent(child, parent) - register struct proc *child; - register struct proc *parent; +proc_reparentlocked(proc_t child, proc_t parent, int cansignal, int locked) { + proc_t oldparent = PROC_NULL; if (child->p_pptr == parent) return; + if (locked == 0) + proc_list_lock(); + + oldparent = child->p_pptr; +#if __PROC_INTERNAL_DEBUG + if (oldparent == PROC_NULL) + panic("proc_reparent: process %x does not have a parent\n", (unsigned int)child); +#endif + LIST_REMOVE(child, p_sibling); +#if __PROC_INTERNAL_DEBUG + if (oldparent->p_childrencnt == 0) + panic("process children count already 0\n"); +#endif + oldparent->p_childrencnt--; +#if __PROC_INTERNAL_DEBUG1 + if (oldparent->p_childrencnt < 0) + panic("process children count -ve\n"); +#endif LIST_INSERT_HEAD(&parent->p_children, child, p_sibling); + parent->p_childrencnt++; child->p_pptr = parent; + child->p_ppid = parent->p_pid; + + proc_list_unlock(); + + if ((cansignal != 0) && (initproc == parent) && (child->p_stat == SZOMB)) + psignal(initproc, SIGCHLD); + if (locked == 1) + proc_list_lock(); } /* @@ -728,39 +1464,37 @@ proc_reparent(child, parent) * gunned down by kill(-1, 0). */ kern_return_t -init_process(void) +init_process(__unused struct init_process_args *args) { - register struct proc *p = current_proc(); + proc_t p = current_proc(); - if (suser(p->p_ucred, &p->p_acflag)) + AUDIT_MACH_SYSCALL_ENTER(AUE_INITPROCESS); + if (suser(kauth_cred_get(), &p->p_acflag)) { + AUDIT_MACH_SYSCALL_EXIT(KERN_NO_ACCESS); return(KERN_NO_ACCESS); + } - if (p->p_pid != 1 && p->p_pgid != p->p_pid) + if (p->p_pid != 1 && p->p_pgrpid != p->p_pid) enterpgrp(p, p->p_pid, 0); - p->p_flag |= P_SYSTEM; + OSBitOrAtomic(P_SYSTEM, (UInt32 *)&p->p_flag); /* * Take us out of the sibling chain, and * out of our parent's child chain. */ + proc_list_lock(); LIST_REMOVE(p, p_sibling); p->p_sibling.le_prev = NULL; p->p_sibling.le_next = NULL; p->p_pptr = kernproc; + p->p_ppid = 0; + proc_list_unlock(); + + AUDIT_MACH_SYSCALL_EXIT(KERN_SUCCESS); return(KERN_SUCCESS); } -void -process_terminate_self(void) -{ - struct proc *p = current_proc(); - - if (p != NULL) { - exit1(p, W_EXITCODE(0, SIGKILL), (int *)NULL); - /*NOTREACHED*/ - } -} /* * Exit: deallocate address space and other resources, change proc state @@ -769,15 +1503,18 @@ process_terminate_self(void) */ void -vfork_exit(p, rv) - struct proc *p; - int rv; +vfork_exit(proc_t p, int rv) +{ + vfork_exit_internal(p, rv, 0); +} + +void +vfork_exit_internal(proc_t p, int rv, int forceexit) { - register struct proc *q, *nq; thread_t self = current_thread(); - thread_act_t th_act_self = current_act(); +#ifdef FIXME struct task *task = p->task; - register int i,s; +#endif struct uthread *ut; /* @@ -786,82 +1523,114 @@ vfork_exit(p, rv) * right here. */ - ut = get_bsdthread_info(th_act_self); -#ifdef FIXME - signal_lock(p); - while (p->exit_thread != self) { - if (sig_try_locked(p) <= 0) { - if (get_threadtask(th_act_self) != task) { - signal_unlock(p); - return; - } - signal_unlock(p); - thread_terminate(th_act_self); - thread_funnel_set(kernel_flock, FALSE); - thread_exception_return(); - /* NOTREACHED */ - } - sig_lock_to_exit(p); + ut = get_bsdthread_info(self); + + + proc_lock(p); + if ((p->p_lflag & P_LPEXIT) == P_LPEXIT) { + /* + * This happens when a parent exits/killed and vfork is in progress + * other threads. But shutdown code for ex has already called exit1() + */ + proc_unlock(p); + return; } - signal_unlock(p); - if (p->p_pid == 1) { - printf("pid 1 exited (signal %d, exit %d)", - WTERMSIG(rv), WEXITSTATUS(rv)); -panic("init died\nState at Last Exception:\n\n%s", init_task_failure_data); + p->p_lflag |= (P_LEXIT | P_LPEXIT); + proc_unlock(p); + + if (forceexit == 0) { + /* + * parent of a vfork child has already called exit() and the + * thread that has vfork in proress terminates. So there is no + * separate address space here and it has already been marked for + * termination. This was never covered before and could cause problems + * if we block here for outside code. + */ + /* Notify the perf server */ + (void)sys_perf_notify(self, p->p_pid); } -#endif /* FIXME */ - s = splsched(); - p->p_flag |= P_WEXIT; - splx(s); /* * Remove proc from allproc queue and from pidhash chain. * Need to do this before we do anything that can block. * Not doing causes things like mount() find this on allproc * in partially cleaned state. */ + + proc_list_lock(); + LIST_REMOVE(p, p_list); - LIST_REMOVE(p, p_hash); - /* - * If parent is waiting for us to exit or exec, - * P_PPWAIT is set; we will wakeup the parent below. - */ - p->p_flag &= ~(P_TRACED | P_PPWAIT); - p->p_sigignore = ~0; - p->p_siglist = 0; + LIST_INSERT_HEAD(&zombproc, p, p_list); /* Place onto zombproc. */ + /* will not be visible via proc_find */ + p->p_listflag |= P_LIST_EXITED; - ut->uu_siglist = 0; - untimeout(realitexpire, (caddr_t)p->p_pid); + proc_list_unlock(); + proc_lock(p); p->p_xstat = rv; + p->p_lflag &= ~(P_LTRACED | P_LPPWAIT); + p->p_sigignore = ~0; + proc_unlock(p); + + proc_spinlock(p); + if (thread_call_cancel(p->p_rcall)) + p->p_ractive--; + + while (p->p_ractive > 0) { + proc_spinunlock(p); + + delay(1); + + proc_spinlock(p); + } + proc_spinunlock(p); - (void)vproc_exit(p); + thread_call_free(p->p_rcall); + p->p_rcall = NULL; + + ut->uu_siglist = 0; + + vproc_exit(p); } void -vproc_exit(struct proc *p) +vproc_exit(proc_t p) { - register struct proc *q, *nq, *pp; - thread_t self = current_thread(); - thread_act_t th_act_self = current_act(); + proc_t q; + proc_t pp; + + vnode_t tvp; +#ifdef FIXME struct task *task = p->task; - register int i,s; - boolean_t funnel_state; +#endif + struct pgrp * pg; + struct session *sessp; + boolean_t fstate; + /* XXX Zombie allocation may fail, in which case stats get lost */ MALLOC_ZONE(p->p_ru, struct rusage *, sizeof (*p->p_ru), M_ZOMBIE, M_WAITOK); + + proc_refdrain(p); + /* * Close open files and release open-file table. * This may block! */ fdfree(p); - if (SESS_LEADER(p)) { - register struct session *sp = p->p_session; + sessp = proc_session(p); + if (SESS_LEADER(p, sessp)) { + + /* Protected by funnel for tty accesses */ + fstate = thread_funnel_set(kernel_flock, TRUE); - if (sp->s_ttyvp) { + if (sessp->s_ttyvp != NULLVP) { struct vnode *ttyvp; + int ttyvid; + struct vfs_context context; + struct tty * tp; /* * Controlling process. @@ -869,87 +1638,141 @@ vproc_exit(struct proc *p) * drain controlling terminal * and revoke access to controlling terminal. */ - if (sp->s_ttyp->t_session == sp) { - if (sp->s_ttyp->t_pgrp) - pgsignal(sp->s_ttyp->t_pgrp, SIGHUP, 1); - (void) ttywait(sp->s_ttyp); + tp = sessp->s_ttyp; + + if ((tp != TTY_NULL) && (tp->t_session == sessp)) { + tty_pgsignal(tp, SIGHUP, 1); + (void) ttywait(tp); /* * The tty could have been revoked * if we blocked. */ - if (sp->s_ttyvp) - VOP_REVOKE(sp->s_ttyvp, REVOKEALL); + + session_lock(sessp); + ttyvp = sessp->s_ttyvp; + ttyvid = sessp->s_ttyvid; + sessp->s_ttyvp = NULL; + sessp->s_ttyvid = 0; + sessp->s_ttyp = NULL; + sessp->s_ttypgrpid = NO_PID; + session_unlock(sessp); + + if ((ttyvp != NULLVP) && (vnode_getwithvid(ttyvp, ttyvid) == 0)) { + context.vc_thread = proc_thread(p); /* XXX */ + context.vc_ucred = kauth_cred_proc_ref(p); + VNOP_REVOKE(ttyvp, REVOKEALL, &context); + vnode_put(ttyvp); + kauth_cred_unref(&context.vc_ucred); + } + } else { + session_lock(sessp); + ttyvp = sessp->s_ttyvp; + sessp->s_ttyvp = NULL; + sessp->s_ttyvid = 0; + sessp->s_ttyp = NULL; + sessp->s_ttypgrpid = NO_PID; + session_unlock(sessp); } - ttyvp = sp->s_ttyvp; - sp->s_ttyvp = NULL; - if (ttyvp) - vrele(ttyvp); + if (ttyvp) + vnode_rele(ttyvp); /* * s_ttyp is not zero'd; we use this to indicate * that the session once had a controlling terminal. * (for logging and informational purposes) */ } - sp->s_leader = NULL; + (void) thread_funnel_set(kernel_flock, fstate); + + session_lock(sessp); + sessp->s_leader = NULL; + session_unlock(sessp); } + session_rele(sessp); + + pg = proc_pgrp(p); + fixjobc(p, pg, 0); + pg_rele(pg); - fixjobc(p, p->p_pgrp, 0); p->p_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; -#if KTRACE - /* - * release trace file - */ - p->p_traceflag = 0; /* don't trace the vrele() */ - if (p->p_tracep) { - struct vnode *tvp = p->p_tracep; - p->p_tracep = NULL; - vrele(tvp); + proc_list_lock(); + proc_childdrainstart(p); + while ((q = p->p_children.lh_first) != NULL) { + q->p_listflag |= P_LIST_DEADPARENT; + if (q->p_stat == SZOMB) { + if (p != q->p_pptr) + panic("parent child linkage broken"); + /* check for lookups by zomb sysctl */ + while ((q->p_listflag & P_LIST_WAITING) == P_LIST_WAITING) { + msleep(&q->p_stat, proc_list_mlock, PWAIT, "waitcoll", 0); + } + q->p_listflag |= P_LIST_WAITING; + /* + * This is a named reference and it is not granted + * if the reap is already in progress. So we get + * the reference here exclusively and their can be + * no waiters. So there is no need for a wakeup + * after we are done. AlsO the reap frees the structure + * and the proc struct cannot be used for wakeups as well. + * It is safe to use q here as this is system reap + */ + (void)reap_child_locked(p, q, 1, 1, 0); + } else { + proc_reparentlocked(q, initproc, 0, 1); + /* + * Traced processes are killed + * since their existence means someone is messing up. + */ + if (q->p_lflag & P_LTRACED) { + proc_list_unlock(); + proc_lock(q); + q->p_lflag &= ~P_LTRACED; + if (q->sigwait_thread) { + proc_unlock(q); + /* + * The sigwait_thread could be stopped at a + * breakpoint. Wake it up to kill. + * Need to do this as it could be a thread which is not + * the first thread in the task. So any attempts to kill + * the process would result into a deadlock on q->sigwait. + */ + thread_resume((thread_t)q->sigwait_thread); + clear_wait(q->sigwait_thread, THREAD_INTERRUPTED); + threadsignal((thread_t)q->sigwait_thread, SIGKILL, 0); + } else + proc_unlock(q); + + psignal(q, SIGKILL); + proc_list_lock(); + } + } } -#endif - q = p->p_children.lh_first; - if (q) /* only need this if any child is S_ZOMB */ - wakeup((caddr_t) initproc); - for (; q != 0; q = nq) { - nq = q->p_sibling.le_next; - proc_reparent(q, initproc); - /* - * Traced processes are killed - * since their existence means someone is messing up. - */ - if (q->p_flag & P_TRACED) { - q->p_flag &= ~P_TRACED; - if (q->sigwait_thread) { - thread_t sig_shuttle; + proc_childdrainend(p); + proc_list_unlock(); - sig_shuttle = (thread_t) getshuttle_thread((thread_act_t)q->sigwait_thread); - /* - * The sigwait_thread could be stopped at a - * breakpoint. Wake it up to kill. - * Need to do this as it could be a thread which is not - * the first thread in the task. So any attempts to kill - * the process would result into a deadlock on q->sigwait. - */ - thread_resume((thread_act_t)q->sigwait_thread); - clear_wait(sig_shuttle, THREAD_INTERRUPTED); - threadsignal((thread_act_t)q->sigwait_thread, SIGKILL, 0); - } - psignal(q, SIGKILL); - } + /* + * Release reference to text vnode + */ + tvp = p->p_textvp; + p->p_textvp = NULL; + if (tvp != NULLVP) { + vnode_rele(tvp); } /* * Save exit status and final rusage info, adding in child rusage - * info and self times. + * info and self times. If we were unable to allocate a zombie + * structure, this information is lost. */ - *p->p_ru = p->p_stats->p_ru; - - timerclear(&p->p_ru->ru_utime); - timerclear(&p->p_ru->ru_stime); + /* No need for locking here as no one than this thread can access this */ + if (p->p_ru != NULL) { + *p->p_ru = p->p_stats->p_ru; + timerclear(&p->p_ru->ru_utime); + timerclear(&p->p_ru->ru_stime); #ifdef FIXME - if (task) { + if (task) { task_basic_info_data_t tinfo; task_thread_times_info_data_t ttimesinfo; int task_info_stuff, task_ttimes_stuff; @@ -972,11 +1795,12 @@ vproc_exit(struct proc *p) st.tv_sec = ttimesinfo.system_time.seconds; st.tv_usec = ttimesinfo.system_time.microseconds; timeradd(&ut,&p->p_ru->ru_utime,&p->p_ru->ru_utime); - timeradd(&st,&p->p_ru->ru_stime,&p->p_ru->ru_stime); - } + timeradd(&st,&p->p_ru->ru_stime,&p->p_ru->ru_stime); + } #endif /* FIXME */ - ruadd(p->p_ru, &p->p_stats->p_cru); + ruadd(p->p_ru, &p->p_stats->p_cru); + } /* * Free up profiling buffers. @@ -990,21 +1814,20 @@ vproc_exit(struct proc *p) for (; p1 != NULL; p1 = pn) { pn = p1->pr_next; - kfree((vm_offset_t)p1, sizeof *p1); + kfree(p1, sizeof *p1); } } /* * Other substructures are freed from wait(). */ - FREE_ZONE(p->p_stats, sizeof *p->p_stats, M_SUBPROC); + FREE_ZONE(p->p_stats, sizeof *p->p_stats, M_PSTATS); p->p_stats = NULL; - FREE_ZONE(p->p_sigacts, sizeof *p->p_sigacts, M_SUBPROC); + FREE_ZONE(p->p_sigacts, sizeof *p->p_sigacts, M_SIGACTS); p->p_sigacts = NULL; - if (--p->p_limit->p_refcnt == 0) - FREE_ZONE(p->p_limit, sizeof *p->p_limit, M_SUBPROC); + proc_limitdrop(p, 1); p->p_limit = NULL; /* @@ -1017,19 +1840,89 @@ vproc_exit(struct proc *p) /* * Notify parent that we're gone. */ - pp = p->p_pptr; - if (pp != initproc) { - pp->si_pid = p->p_pid; - pp->si_status = p->p_xstat; - pp->si_code = CLD_EXITED; - pp->si_uid = p->p_cred->p_ruid; + pp = proc_parent(p); + if ((p->p_listflag & P_LIST_DEADPARENT) == 0) { + if (pp != initproc) { + proc_lock(pp); + pp->si_pid = p->p_pid; + pp->si_status = p->p_xstat; + pp->si_code = CLD_EXITED; + /* + * p_ucred usage is safe as it is an exiting process + * and reference is dropped in reap + */ + pp->si_uid = p->p_ucred->cr_ruid; + proc_unlock(pp); + } + /* mark as a zombie */ + /* mark as a zombie */ + /* No need to take proc lock as all refs are drained and + * no one except parent (reaping ) can look at this. + * The write is to an int and is coherent. Also parent is + * keyed off of list lock for reaping + */ + p->p_stat = SZOMB; + + psignal(pp, SIGCHLD); + + /* and now wakeup the parent */ + proc_list_lock(); + wakeup((caddr_t)pp); + proc_list_unlock(); + } else { + proc_list_lock(); + p->p_stat = SZOMB; + /* check for lookups by zomb sysctl */ + while ((p->p_listflag & P_LIST_WAITING) == P_LIST_WAITING) { + msleep(&p->p_stat, proc_list_mlock, PWAIT, "waitcoll", 0); + } + p->p_listflag |= P_LIST_WAITING; + /* + * This is a named reference and it is not granted + * if the reap is already in progress. So we get + * the reference here exclusively and their can be + * no waiters. So there is no need for a wakeup + * after we are done. AlsO the reap frees the structure + * and the proc struct cannot be used for wakeups as well. + * It is safe to use p here as this is system reap + */ + (void)reap_child_locked(pp, p, 0, 1, 1); + /* list lock dropped by reap_child_locked */ } - psignal(p->p_pptr, SIGCHLD); - - /* Place onto zombproc. */ - LIST_INSERT_HEAD(&zombproc, p, p_list); - p->p_stat = SZOMB; + proc_rele(pp); +} - /* and now wakeup the parent */ - wakeup((caddr_t)p->p_pptr); + +/* + * munge_rusage + * LP64 support - long is 64 bits if we are dealing with a 64 bit user + * process. We munge the kernel (32 bit) version of rusage into the + * 64 bit version. + */ +__private_extern__ void +munge_rusage(struct rusage *a_rusage_p, struct user_rusage *a_user_rusage_p) +{ + /* timeval changes size, so utime and stime need special handling */ + a_user_rusage_p->ru_utime.tv_sec = a_rusage_p->ru_utime.tv_sec; + a_user_rusage_p->ru_utime.tv_usec = a_rusage_p->ru_utime.tv_usec; + a_user_rusage_p->ru_stime.tv_sec = a_rusage_p->ru_stime.tv_sec; + a_user_rusage_p->ru_stime.tv_usec = a_rusage_p->ru_stime.tv_usec; + /* + * everything else can be a direct assign, since there is no loss + * of precision implied boing 32->64. + */ + a_user_rusage_p->ru_maxrss = a_rusage_p->ru_maxrss; + a_user_rusage_p->ru_ixrss = a_rusage_p->ru_ixrss; + a_user_rusage_p->ru_idrss = a_rusage_p->ru_idrss; + a_user_rusage_p->ru_isrss = a_rusage_p->ru_isrss; + a_user_rusage_p->ru_minflt = a_rusage_p->ru_minflt; + a_user_rusage_p->ru_majflt = a_rusage_p->ru_majflt; + a_user_rusage_p->ru_nswap = a_rusage_p->ru_nswap; + a_user_rusage_p->ru_inblock = a_rusage_p->ru_inblock; + a_user_rusage_p->ru_oublock = a_rusage_p->ru_oublock; + a_user_rusage_p->ru_msgsnd = a_rusage_p->ru_msgsnd; + a_user_rusage_p->ru_msgrcv = a_rusage_p->ru_msgrcv; + a_user_rusage_p->ru_nsignals = a_rusage_p->ru_nsignals; + a_user_rusage_p->ru_nvcsw = a_rusage_p->ru_nvcsw; + a_user_rusage_p->ru_nivcsw = a_rusage_p->ru_nivcsw; }