X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/0c530ab8987f0ae6a1a3d9284f40182b88852816..a991bd8d3e7fe02dbca0644054bab73c5b75324a:/bsd/kern/kern_exit.c?ds=inline diff --git a/bsd/kern/kern_exit.c b/bsd/kern/kern_exit.c index 4a318232c..c38e6a898 100644 --- a/bsd/kern/kern_exit.c +++ b/bsd/kern/kern_exit.c @@ -1,23 +1,29 @@ /* - * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2016 Apple Inc. All rights reserved. * - * @APPLE_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 Original Code and all software distributed under the License are - * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER + * @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. 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 * 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. - * - * @APPLE_LICENSE_HEADER_END@ + * 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_OSREFERENCE_LICENSE_HEADER_END@ */ /* Copyright (c) 1995, 1997 Apple Computer, Inc. All Rights Reserved */ /* @@ -59,9 +65,16 @@ * * @(#)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 +#include #include "compat_43.h" @@ -69,6 +82,7 @@ #include #include #include +#include #include #include #include @@ -81,89 +95,755 @@ #include #include #include +#include +#include +#include #include #include #include #include -#include /* fdfree */ -#include /* shmexit */ -#include /* acct_process */ -#include - -#include +#include +#include /* fdfree */ +#include /* acct_process */ +#include +#include /* kevent_proc_copy_uptrs */ +#include + +#include #include #include +#include +#include +#include #include #include #include +#include #include +#include #include #include -#if KTRACE -#include -#endif - -#include -#include -#include -#include /* init_process */ +#include +#include + +#include +#include + +#include + +#if SYSV_SHM +#include /* shmexit */ +#endif /* SYSV_SHM */ +#if CONFIG_PERSONAS +#include +#endif /* CONFIG_PERSONAS */ +#if CONFIG_MEMORYSTATUS +#include +#endif /* CONFIG_MEMORYSTATUS */ +#if CONFIG_DTRACE +/* Do not include dtrace.h, it redefines kmem_[alloc/free] */ +void dtrace_proc_exit(proc_t p); +#include +#endif /* CONFIG_DTRACE */ +#if CONFIG_MACF +#include +#include +#include +#endif /* CONFIG_MACF */ + +#if CONFIG_MEMORYSTATUS +static void proc_memorystatus_remove(proc_t p); +#endif /* CONFIG_MEMORYSTATUS */ +void proc_prepareexit(proc_t p, int rv, boolean_t perf_notify); +void gather_populate_corpse_crashinfo(proc_t p, task_t corpse_task, + mach_exception_data_type_t code, mach_exception_data_type_t subcode, + uint64_t *udata_buffer, int num_udata, void *reason); +mach_exception_data_type_t proc_encode_exit_exception_code(proc_t p); +void vfork_exit(proc_t p, int rv); +__private_extern__ void munge_user64_rusage(struct rusage *a_rusage_p, struct user64_rusage *a_user_rusage_p); +__private_extern__ void munge_user32_rusage(struct rusage *a_rusage_p, struct user32_rusage *a_user_rusage_p); +static int reap_child_locked(proc_t parent, proc_t child, int deadparent, int reparentedtoinit, int locked, int droplock); +static void populate_corpse_crashinfo(proc_t p, task_t corpse_task, + struct rusage_superset *rup, mach_exception_data_type_t code, + mach_exception_data_type_t subcode, uint64_t *udata_buffer, + int num_udata, os_reason_t reason); +static void proc_update_corpse_exception_codes(proc_t p, mach_exception_data_type_t *code, mach_exception_data_type_t *subcode); +extern int proc_pidpathinfo_internal(proc_t p, uint64_t arg, char *buffer, uint32_t buffersize, int32_t *retval); +static __attribute__((noinline)) void launchd_crashed_panic(proc_t p, int rv); +extern void proc_piduniqidentifierinfo(proc_t p, struct proc_uniqidentifierinfo *p_uniqidinfo); +extern void task_coalition_ids(task_t task, uint64_t ids[COALITION_NUM_TYPES]); +extern uint64_t get_task_phys_footprint_limit(task_t); +int proc_list_uptrs(void *p, uint64_t *udata_buffer, int size); +extern uint64_t task_corpse_get_crashed_thread_id(task_t corpse_task); + +ZONE_DECLARE(zombie_zone, "zombie", + sizeof(struct rusage_superset), ZC_NOENCRYPT); -extern char init_task_failure_data[]; -int exit1(struct proc *, int, int *); -void proc_prepareexit(struct proc *p); -void vfork_exit(struct proc *p, int rv); -void vproc_exit(struct proc *p); -__private_extern__ void munge_rusage(struct rusage *a_rusage_p, struct user_rusage *a_user_rusage_p); /* * Things which should have prototypes in headers, but don't */ -void unix_syscall_return(int); -void *get_bsduthreadarg(thread_t); -void proc_exit(struct proc *p); -int wait1continue(int result); -int waitidcontinue(int result); -int *get_bsduthreadrval(thread_t); -kern_return_t sys_perf_notify(struct task *task, exception_data_t code, - mach_msg_type_number_t codeCnt); +void proc_exit(proc_t p); +int wait1continue(int result); +int waitidcontinue(int result); +kern_return_t sys_perf_notify(thread_t thread, int pid); +kern_return_t task_exception_notify(exception_type_t exception, + mach_exception_data_type_t code, mach_exception_data_type_t subcode); +kern_return_t task_violated_guard(mach_exception_code_t, mach_exception_subcode_t, void *); +void delay(int); +void gather_rusage_info(proc_t p, rusage_info_current *ru, int flavor); + +#if __has_feature(ptrauth_calls) +int exit_with_pac_exception(proc_t p, exception_type_t exception, mach_exception_code_t code, + mach_exception_subcode_t subcode); +#endif /* __has_feature(ptrauth_calls) */ + /* * 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) +void +siginfo_user_to_user32(user_siginfo_t *in, user32_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_EXPLICIT(user32_addr_t, in->si_addr); + /* following cast works for sival_int because of padding */ + out->si_value.sival_ptr = CAST_DOWN_EXPLICIT(user32_addr_t, in->si_value.sival_ptr); + out->si_band = (user32_long_t)in->si_band; /* range reduction */ +} + +void +siginfo_user_to_user64(user_siginfo_t *in, user64_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); + 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 = 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 */ + out->si_value.sival_ptr = in->si_value.sival_ptr; + out->si_band = in->si_band; /* range reduction */ +} + +static int +copyoutsiginfo(user_siginfo_t *native, boolean_t is64, user_addr_t uaddr) +{ + if (is64) { + user64_siginfo_t sinfo64; + + bzero(&sinfo64, sizeof(sinfo64)); + siginfo_user_to_user64(native, &sinfo64); + return copyout(&sinfo64, uaddr, sizeof(sinfo64)); + } else { + user32_siginfo_t sinfo32; + + bzero(&sinfo32, sizeof(sinfo32)); + siginfo_user_to_user32(native, &sinfo32); + return copyout(&sinfo32, uaddr, sizeof(sinfo32)); + } +} + +void +gather_populate_corpse_crashinfo(proc_t p, task_t corpse_task, + mach_exception_data_type_t code, mach_exception_data_type_t subcode, + uint64_t *udata_buffer, int num_udata, void *reason) +{ + struct rusage_superset rup; + + gather_rusage_info(p, &rup.ri, RUSAGE_INFO_CURRENT); + rup.ri.ri_phys_footprint = 0; + populate_corpse_crashinfo(p, corpse_task, &rup, code, subcode, + udata_buffer, num_udata, reason); +} + +static void +proc_update_corpse_exception_codes(proc_t p, mach_exception_data_type_t *code, mach_exception_data_type_t *subcode) +{ + mach_exception_data_type_t code_update = *code; + mach_exception_data_type_t subcode_update = *subcode; + if (p->p_exit_reason == OS_REASON_NULL) { + return; + } + + switch (p->p_exit_reason->osr_namespace) { + case OS_REASON_JETSAM: + if (p->p_exit_reason->osr_code == JETSAM_REASON_MEMORY_PERPROCESSLIMIT) { + /* Update the code with EXC_RESOURCE code for high memory watermark */ + EXC_RESOURCE_ENCODE_TYPE(code_update, RESOURCE_TYPE_MEMORY); + EXC_RESOURCE_ENCODE_FLAVOR(code_update, FLAVOR_HIGH_WATERMARK); + EXC_RESOURCE_HWM_ENCODE_LIMIT(code_update, ((get_task_phys_footprint_limit(p->task)) >> 20)); + subcode_update = 0; + break; + } + + break; + default: + break; + } + + *code = code_update; + *subcode = subcode_update; + return; +} + +mach_exception_data_type_t +proc_encode_exit_exception_code(proc_t p) +{ + uint64_t subcode = 0; + + if (p->p_exit_reason == OS_REASON_NULL) { + return 0; + } + + /* Embed first 32 bits of osr_namespace and osr_code in exception code */ + ENCODE_OSR_NAMESPACE_TO_MACH_EXCEPTION_CODE(subcode, p->p_exit_reason->osr_namespace); + ENCODE_OSR_CODE_TO_MACH_EXCEPTION_CODE(subcode, p->p_exit_reason->osr_code); + return (mach_exception_data_type_t)subcode; +} + +static void +populate_corpse_crashinfo(proc_t p, task_t corpse_task, struct rusage_superset *rup, + mach_exception_data_type_t code, mach_exception_data_type_t subcode, + uint64_t *udata_buffer, int num_udata, os_reason_t reason) +{ + mach_vm_address_t uaddr = 0; + mach_exception_data_type_t exc_codes[EXCEPTION_CODE_MAX]; + exc_codes[0] = code; + exc_codes[1] = subcode; + cpu_type_t cputype; + struct proc_uniqidentifierinfo p_uniqidinfo; + struct proc_workqueueinfo pwqinfo; + int retval = 0; + uint64_t crashed_threadid = task_corpse_get_crashed_thread_id(corpse_task); + unsigned int pflags = 0; + uint64_t max_footprint_mb; + uint64_t max_footprint; + + uint64_t ledger_internal; + uint64_t ledger_internal_compressed; + uint64_t ledger_iokit_mapped; + uint64_t ledger_alternate_accounting; + uint64_t ledger_alternate_accounting_compressed; + uint64_t ledger_purgeable_nonvolatile; + uint64_t ledger_purgeable_nonvolatile_compressed; + uint64_t ledger_page_table; + uint64_t ledger_phys_footprint; + uint64_t ledger_phys_footprint_lifetime_max; + uint64_t ledger_network_nonvolatile; + uint64_t ledger_network_nonvolatile_compressed; + uint64_t ledger_wired_mem; + uint64_t ledger_tagged_footprint; + uint64_t ledger_tagged_footprint_compressed; + uint64_t ledger_media_footprint; + uint64_t ledger_media_footprint_compressed; + uint64_t ledger_graphics_footprint; + uint64_t ledger_graphics_footprint_compressed; + uint64_t ledger_neural_footprint; + uint64_t ledger_neural_footprint_compressed; + + void *crash_info_ptr = task_get_corpseinfo(corpse_task); + +#if CONFIG_MEMORYSTATUS + int memstat_dirty_flags = 0; +#endif + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_EXCEPTION_CODES, sizeof(exc_codes), &uaddr)) { + kcdata_memcpy(crash_info_ptr, uaddr, exc_codes, sizeof(exc_codes)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_PID, sizeof(p->p_pid), &uaddr)) { + kcdata_memcpy(crash_info_ptr, uaddr, &p->p_pid, sizeof(p->p_pid)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_PPID, sizeof(p->p_ppid), &uaddr)) { + kcdata_memcpy(crash_info_ptr, uaddr, &p->p_ppid, sizeof(p->p_ppid)); + } + + /* Don't include the crashed thread ID if there's an exit reason that indicates it's irrelevant */ + if ((p->p_exit_reason == OS_REASON_NULL) || !(p->p_exit_reason->osr_flags & OS_REASON_FLAG_NO_CRASHED_TID)) { + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_CRASHED_THREADID, sizeof(uint64_t), &uaddr)) { + kcdata_memcpy(crash_info_ptr, uaddr, &crashed_threadid, sizeof(uint64_t)); + } + } + + static_assert(sizeof(struct proc_uniqidentifierinfo) == sizeof(struct crashinfo_proc_uniqidentifierinfo)); + if (KERN_SUCCESS == + kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_BSDINFOWITHUNIQID, sizeof(struct proc_uniqidentifierinfo), &uaddr)) { + proc_piduniqidentifierinfo(p, &p_uniqidinfo); + kcdata_memcpy(crash_info_ptr, uaddr, &p_uniqidinfo, sizeof(struct proc_uniqidentifierinfo)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_RUSAGE_INFO, sizeof(rusage_info_current), &uaddr)) { + kcdata_memcpy(crash_info_ptr, uaddr, &rup->ri, sizeof(rusage_info_current)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_PROC_CSFLAGS, sizeof(p->p_csflags), &uaddr)) { + kcdata_memcpy(crash_info_ptr, uaddr, &p->p_csflags, sizeof(p->p_csflags)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_PROC_NAME, sizeof(p->p_comm), &uaddr)) { + kcdata_memcpy(crash_info_ptr, uaddr, &p->p_comm, sizeof(p->p_comm)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_PROC_STARTTIME, sizeof(p->p_start), &uaddr)) { + struct timeval64 t64; + t64.tv_sec = (int64_t)p->p_start.tv_sec; + t64.tv_usec = (int64_t)p->p_start.tv_usec; + kcdata_memcpy(crash_info_ptr, uaddr, &t64, sizeof(t64)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_USERSTACK, sizeof(p->user_stack), &uaddr)) { + kcdata_memcpy(crash_info_ptr, uaddr, &p->user_stack, sizeof(p->user_stack)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_ARGSLEN, sizeof(p->p_argslen), &uaddr)) { + kcdata_memcpy(crash_info_ptr, uaddr, &p->p_argslen, sizeof(p->p_argslen)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_PROC_ARGC, sizeof(p->p_argc), &uaddr)) { + kcdata_memcpy(crash_info_ptr, uaddr, &p->p_argc, sizeof(p->p_argc)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_PROC_PATH, MAXPATHLEN, &uaddr)) { + char *buf = zalloc_flags(ZV_NAMEI, Z_WAITOK | Z_ZERO); + proc_pidpathinfo_internal(p, 0, buf, MAXPATHLEN, &retval); + kcdata_memcpy(crash_info_ptr, uaddr, buf, MAXPATHLEN); + zfree(ZV_NAMEI, buf); + } + + pflags = p->p_flag & (P_LP64 | P_SUGID | P_TRANSLATED); + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_PROC_FLAGS, sizeof(pflags), &uaddr)) { + kcdata_memcpy(crash_info_ptr, uaddr, &pflags, sizeof(pflags)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_UID, sizeof(p->p_uid), &uaddr)) { + kcdata_memcpy(crash_info_ptr, uaddr, &p->p_uid, sizeof(p->p_uid)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_GID, sizeof(p->p_gid), &uaddr)) { + kcdata_memcpy(crash_info_ptr, uaddr, &p->p_gid, sizeof(p->p_gid)); + } + + cputype = cpu_type() & ~CPU_ARCH_MASK; + if (IS_64BIT_PROCESS(p)) { + cputype |= CPU_ARCH_ABI64; + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_CPUTYPE, sizeof(cpu_type_t), &uaddr)) { + kcdata_memcpy(crash_info_ptr, uaddr, &cputype, sizeof(cpu_type_t)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_MEMORY_LIMIT, sizeof(max_footprint_mb), &uaddr)) { + max_footprint = get_task_phys_footprint_limit(p->task); + max_footprint_mb = max_footprint >> 20; + kcdata_memcpy(crash_info_ptr, uaddr, &max_footprint_mb, sizeof(max_footprint_mb)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_LEDGER_PHYS_FOOTPRINT_LIFETIME_MAX, sizeof(ledger_phys_footprint_lifetime_max), &uaddr)) { + ledger_phys_footprint_lifetime_max = get_task_phys_footprint_lifetime_max(p->task); + kcdata_memcpy(crash_info_ptr, uaddr, &ledger_phys_footprint_lifetime_max, sizeof(ledger_phys_footprint_lifetime_max)); + } + + // In the forking case, the current ledger info is copied into the corpse while the original task is suspended for consistency + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_LEDGER_INTERNAL, sizeof(ledger_internal), &uaddr)) { + ledger_internal = get_task_internal(corpse_task); + kcdata_memcpy(crash_info_ptr, uaddr, &ledger_internal, sizeof(ledger_internal)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_LEDGER_INTERNAL_COMPRESSED, sizeof(ledger_internal_compressed), &uaddr)) { + ledger_internal_compressed = get_task_internal_compressed(corpse_task); + kcdata_memcpy(crash_info_ptr, uaddr, &ledger_internal_compressed, sizeof(ledger_internal_compressed)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_LEDGER_IOKIT_MAPPED, sizeof(ledger_iokit_mapped), &uaddr)) { + ledger_iokit_mapped = get_task_iokit_mapped(corpse_task); + kcdata_memcpy(crash_info_ptr, uaddr, &ledger_iokit_mapped, sizeof(ledger_iokit_mapped)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_LEDGER_ALTERNATE_ACCOUNTING, sizeof(ledger_alternate_accounting), &uaddr)) { + ledger_alternate_accounting = get_task_alternate_accounting(corpse_task); + kcdata_memcpy(crash_info_ptr, uaddr, &ledger_alternate_accounting, sizeof(ledger_alternate_accounting)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_LEDGER_ALTERNATE_ACCOUNTING_COMPRESSED, sizeof(ledger_alternate_accounting_compressed), &uaddr)) { + ledger_alternate_accounting_compressed = get_task_alternate_accounting_compressed(corpse_task); + kcdata_memcpy(crash_info_ptr, uaddr, &ledger_alternate_accounting_compressed, sizeof(ledger_alternate_accounting_compressed)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_LEDGER_PURGEABLE_NONVOLATILE, sizeof(ledger_purgeable_nonvolatile), &uaddr)) { + ledger_purgeable_nonvolatile = get_task_purgeable_nonvolatile(corpse_task); + kcdata_memcpy(crash_info_ptr, uaddr, &ledger_purgeable_nonvolatile, sizeof(ledger_purgeable_nonvolatile)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_LEDGER_PURGEABLE_NONVOLATILE_COMPRESSED, sizeof(ledger_purgeable_nonvolatile_compressed), &uaddr)) { + ledger_purgeable_nonvolatile_compressed = get_task_purgeable_nonvolatile_compressed(corpse_task); + kcdata_memcpy(crash_info_ptr, uaddr, &ledger_purgeable_nonvolatile_compressed, sizeof(ledger_purgeable_nonvolatile_compressed)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_LEDGER_PAGE_TABLE, sizeof(ledger_page_table), &uaddr)) { + ledger_page_table = get_task_page_table(corpse_task); + kcdata_memcpy(crash_info_ptr, uaddr, &ledger_page_table, sizeof(ledger_page_table)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_LEDGER_PHYS_FOOTPRINT, sizeof(ledger_phys_footprint), &uaddr)) { + ledger_phys_footprint = get_task_phys_footprint(corpse_task); + kcdata_memcpy(crash_info_ptr, uaddr, &ledger_phys_footprint, sizeof(ledger_phys_footprint)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_LEDGER_NETWORK_NONVOLATILE, sizeof(ledger_network_nonvolatile), &uaddr)) { + ledger_network_nonvolatile = get_task_network_nonvolatile(corpse_task); + kcdata_memcpy(crash_info_ptr, uaddr, &ledger_network_nonvolatile, sizeof(ledger_network_nonvolatile)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_LEDGER_NETWORK_NONVOLATILE_COMPRESSED, sizeof(ledger_network_nonvolatile_compressed), &uaddr)) { + ledger_network_nonvolatile_compressed = get_task_network_nonvolatile_compressed(corpse_task); + kcdata_memcpy(crash_info_ptr, uaddr, &ledger_network_nonvolatile_compressed, sizeof(ledger_network_nonvolatile_compressed)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_LEDGER_WIRED_MEM, sizeof(ledger_wired_mem), &uaddr)) { + ledger_wired_mem = get_task_wired_mem(corpse_task); + kcdata_memcpy(crash_info_ptr, uaddr, &ledger_wired_mem, sizeof(ledger_wired_mem)); + } + + bzero(&pwqinfo, sizeof(struct proc_workqueueinfo)); + retval = fill_procworkqueue(p, &pwqinfo); + if (retval == 0) { + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_WORKQUEUEINFO, sizeof(struct proc_workqueueinfo), &uaddr)) { + kcdata_memcpy(crash_info_ptr, uaddr, &pwqinfo, sizeof(struct proc_workqueueinfo)); + } + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_RESPONSIBLE_PID, sizeof(p->p_responsible_pid), &uaddr)) { + kcdata_memcpy(crash_info_ptr, uaddr, &p->p_responsible_pid, sizeof(p->p_responsible_pid)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_PROC_PERSONA_ID, sizeof(uid_t), &uaddr)) { + uid_t persona_id = proc_persona_id(p); + kcdata_memcpy(crash_info_ptr, uaddr, &persona_id, sizeof(persona_id)); + } + +#if CONFIG_COALITIONS + if (KERN_SUCCESS == kcdata_get_memory_addr_for_array(crash_info_ptr, TASK_CRASHINFO_COALITION_ID, sizeof(uint64_t), COALITION_NUM_TYPES, &uaddr)) { + uint64_t coalition_ids[COALITION_NUM_TYPES]; + task_coalition_ids(p->task, coalition_ids); + kcdata_memcpy(crash_info_ptr, uaddr, coalition_ids, sizeof(coalition_ids)); + } +#endif /* CONFIG_COALITIONS */ + +#if CONFIG_MEMORYSTATUS + memstat_dirty_flags = memorystatus_dirty_get(p, FALSE); + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_DIRTY_FLAGS, sizeof(memstat_dirty_flags), &uaddr)) { + kcdata_memcpy(crash_info_ptr, uaddr, &memstat_dirty_flags, sizeof(memstat_dirty_flags)); + } +#endif + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_MEMORY_LIMIT_INCREASE, sizeof(p->p_memlimit_increase), &uaddr)) { + kcdata_memcpy(crash_info_ptr, uaddr, &p->p_memlimit_increase, sizeof(p->p_memlimit_increase)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_LEDGER_TAGGED_FOOTPRINT, sizeof(ledger_tagged_footprint), &uaddr)) { + ledger_tagged_footprint = get_task_tagged_footprint(corpse_task); + kcdata_memcpy(crash_info_ptr, uaddr, &ledger_tagged_footprint, sizeof(ledger_tagged_footprint)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_LEDGER_TAGGED_FOOTPRINT_COMPRESSED, sizeof(ledger_tagged_footprint_compressed), &uaddr)) { + ledger_tagged_footprint_compressed = get_task_tagged_footprint_compressed(corpse_task); + kcdata_memcpy(crash_info_ptr, uaddr, &ledger_tagged_footprint_compressed, sizeof(ledger_tagged_footprint_compressed)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_LEDGER_MEDIA_FOOTPRINT, sizeof(ledger_media_footprint), &uaddr)) { + ledger_media_footprint = get_task_media_footprint(corpse_task); + kcdata_memcpy(crash_info_ptr, uaddr, &ledger_media_footprint, sizeof(ledger_media_footprint)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_LEDGER_MEDIA_FOOTPRINT_COMPRESSED, sizeof(ledger_media_footprint_compressed), &uaddr)) { + ledger_media_footprint_compressed = get_task_media_footprint_compressed(corpse_task); + kcdata_memcpy(crash_info_ptr, uaddr, &ledger_media_footprint_compressed, sizeof(ledger_media_footprint_compressed)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_LEDGER_GRAPHICS_FOOTPRINT, sizeof(ledger_graphics_footprint), &uaddr)) { + ledger_graphics_footprint = get_task_graphics_footprint(corpse_task); + kcdata_memcpy(crash_info_ptr, uaddr, &ledger_graphics_footprint, sizeof(ledger_graphics_footprint)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_LEDGER_GRAPHICS_FOOTPRINT_COMPRESSED, sizeof(ledger_graphics_footprint_compressed), &uaddr)) { + ledger_graphics_footprint_compressed = get_task_graphics_footprint_compressed(corpse_task); + kcdata_memcpy(crash_info_ptr, uaddr, &ledger_graphics_footprint_compressed, sizeof(ledger_graphics_footprint_compressed)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_LEDGER_NEURAL_FOOTPRINT, sizeof(ledger_neural_footprint), &uaddr)) { + ledger_neural_footprint = get_task_neural_footprint(corpse_task); + kcdata_memcpy(crash_info_ptr, uaddr, &ledger_neural_footprint, sizeof(ledger_neural_footprint)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_LEDGER_NEURAL_FOOTPRINT_COMPRESSED, sizeof(ledger_neural_footprint_compressed), &uaddr)) { + ledger_neural_footprint_compressed = get_task_neural_footprint_compressed(corpse_task); + kcdata_memcpy(crash_info_ptr, uaddr, &ledger_neural_footprint_compressed, sizeof(ledger_neural_footprint_compressed)); + } + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_MEMORYSTATUS_EFFECTIVE_PRIORITY, sizeof(p->p_memstat_effectivepriority), &uaddr)) { + kcdata_memcpy(crash_info_ptr, uaddr, &p->p_memstat_effectivepriority, sizeof(p->p_memstat_effectivepriority)); + } + + if (p->p_exit_reason != OS_REASON_NULL && reason == OS_REASON_NULL) { + reason = p->p_exit_reason; + } + if (reason != OS_REASON_NULL) { + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, EXIT_REASON_SNAPSHOT, sizeof(struct exit_reason_snapshot), &uaddr)) { + struct exit_reason_snapshot ers = { + .ers_namespace = reason->osr_namespace, + .ers_code = reason->osr_code, + .ers_flags = reason->osr_flags + }; + + kcdata_memcpy(crash_info_ptr, uaddr, &ers, sizeof(ers)); + } + + if (reason->osr_kcd_buf != 0) { + uint32_t reason_buf_size = (uint32_t)kcdata_memory_get_used_bytes(&reason->osr_kcd_descriptor); + assert(reason_buf_size != 0); + + if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, KCDATA_TYPE_NESTED_KCDATA, reason_buf_size, &uaddr)) { + kcdata_memcpy(crash_info_ptr, uaddr, reason->osr_kcd_buf, reason_buf_size); + } + } + } + + if (num_udata > 0) { + if (KERN_SUCCESS == kcdata_get_memory_addr_for_array(crash_info_ptr, TASK_CRASHINFO_UDATA_PTRS, + sizeof(uint64_t), num_udata, &uaddr)) { + kcdata_memcpy(crash_info_ptr, uaddr, udata_buffer, sizeof(uint64_t) * num_udata); + } + } } +/* + * We only parse exit reason kcdata blobs for launchd when it dies + * and we're going to panic. + * + * Meant to be called immediately before panicking. + */ +char * +launchd_exit_reason_get_string_desc(os_reason_t exit_reason) +{ + kcdata_iter_t iter; + + if (exit_reason == OS_REASON_NULL || exit_reason->osr_kcd_buf == NULL || + exit_reason->osr_bufsize == 0) { + return NULL; + } + + iter = kcdata_iter(exit_reason->osr_kcd_buf, exit_reason->osr_bufsize); + if (!kcdata_iter_valid(iter)) { +#if DEBUG || DEVELOPMENT + printf("launchd exit reason has invalid exit reason buffer\n"); +#endif + return NULL; + } + + if (kcdata_iter_type(iter) != KCDATA_BUFFER_BEGIN_OS_REASON) { +#if DEBUG || DEVELOPMENT + printf("launchd exit reason buffer type mismatch, expected %d got %d\n", + KCDATA_BUFFER_BEGIN_OS_REASON, kcdata_iter_type(iter)); +#endif + return NULL; + } + + iter = kcdata_iter_find_type(iter, EXIT_REASON_USER_DESC); + if (!kcdata_iter_valid(iter)) { + return NULL; + } + + return (char *)kcdata_iter_payload(iter); +} + +__abortlike +static void +launchd_crashed_panic(proc_t p, int rv) +{ + char *launchd_exit_reason_desc = launchd_exit_reason_get_string_desc(p->p_exit_reason); + + if (p->p_exit_reason == OS_REASON_NULL) { + printf("pid 1 exited -- no exit reason available -- (signal %d, exit %d)\n", + WTERMSIG(rv), WEXITSTATUS(rv)); + } else { + printf("pid 1 exited -- exit reason namespace %d subcode 0x%llx, description %s\n", + p->p_exit_reason->osr_namespace, p->p_exit_reason->osr_code, launchd_exit_reason_desc ? + launchd_exit_reason_desc : "none"); + } + + const char *launchd_crashed_prefix_str; + + if (strnstr(p->p_name, "preinit", sizeof(p->p_name))) { + launchd_crashed_prefix_str = "LTE preinit process exited"; + } else { + launchd_crashed_prefix_str = "initproc exited"; + } + +#if (DEVELOPMENT || DEBUG) && CONFIG_COREDUMP + /* + * For debugging purposes, generate a core file of initproc before + * panicking. Leave at least 300 MB free on the root volume, and ignore + * the process's corefile ulimit. fsync() the file to ensure it lands on disk + * before the panic hits. + */ + + int err; + uint64_t coredump_start = mach_absolute_time(); + uint64_t coredump_end; + clock_sec_t tv_sec; + clock_usec_t tv_usec; + uint32_t tv_msec; + + + err = coredump(p, 300, COREDUMP_IGNORE_ULIMIT | COREDUMP_FULLFSYNC); + + coredump_end = mach_absolute_time(); + + absolutetime_to_microtime(coredump_end - coredump_start, &tv_sec, &tv_usec); + + tv_msec = tv_usec / 1000; + + if (err != 0) { + printf("Failed to generate initproc core file: error %d, took %d.%03d seconds\n", + err, (uint32_t)tv_sec, tv_msec); + } else { + printf("Generated initproc core file in %d.%03d seconds\n", + (uint32_t)tv_sec, tv_msec); + } +#endif /* (DEVELOPMENT || DEBUG) && CONFIG_COREDUMP */ + + sync(p, (void *)NULL, (int *)NULL); + + if (p->p_exit_reason == OS_REASON_NULL) { + panic_with_options(0, NULL, DEBUGGER_OPTION_INITPROC_PANIC, "%s -- no exit reason available -- (signal %d, exit status %d %s)", + launchd_crashed_prefix_str, WTERMSIG(rv), WEXITSTATUS(rv), ((p->p_csflags & CS_KILLED) ? "CS_KILLED" : "")); + } else { + panic_with_options(0, NULL, DEBUGGER_OPTION_INITPROC_PANIC, "%s %s -- exit reason namespace %d subcode 0x%llx description: %." LAUNCHD_PANIC_REASON_STRING_MAXLEN "s", + ((p->p_csflags & CS_KILLED) ? "CS_KILLED" : ""), + launchd_crashed_prefix_str, p->p_exit_reason->osr_namespace, p->p_exit_reason->osr_code, + launchd_exit_reason_desc ? launchd_exit_reason_desc : "none"); + } +} + +#define OS_REASON_IFLAG_USER_FAULT 0x1 + +#define OS_REASON_TOTAL_USER_FAULTS_PER_PROC 5 + +static int +abort_with_payload_internal(proc_t p, + uint32_t reason_namespace, uint64_t reason_code, + user_addr_t payload, uint32_t payload_size, + user_addr_t reason_string, uint64_t reason_flags, + uint32_t internal_flags) +{ + os_reason_t exit_reason = OS_REASON_NULL; + kern_return_t kr = KERN_SUCCESS; + + if (internal_flags & OS_REASON_IFLAG_USER_FAULT) { + uint32_t old_value = atomic_load_explicit(&p->p_user_faults, + memory_order_relaxed); + for (;;) { + if (old_value >= OS_REASON_TOTAL_USER_FAULTS_PER_PROC) { + return EQFULL; + } + // this reloads the value in old_value + if (atomic_compare_exchange_strong_explicit(&p->p_user_faults, + &old_value, old_value + 1, memory_order_relaxed, + memory_order_relaxed)) { + break; + } + } + } + + KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_PROC, BSD_PROC_EXITREASON_CREATE) | DBG_FUNC_NONE, + p->p_pid, reason_namespace, + reason_code, 0, 0); + + exit_reason = build_userspace_exit_reason(reason_namespace, reason_code, + payload, payload_size, reason_string, reason_flags | OS_REASON_FLAG_ABORT); + + if (internal_flags & OS_REASON_IFLAG_USER_FAULT) { + mach_exception_code_t code = 0; + + EXC_GUARD_ENCODE_TYPE(code, GUARD_TYPE_USER); /* simulated EXC_GUARD */ + EXC_GUARD_ENCODE_FLAVOR(code, 0); + EXC_GUARD_ENCODE_TARGET(code, reason_namespace); + + if (exit_reason == OS_REASON_NULL) { + kr = KERN_RESOURCE_SHORTAGE; + } else { + kr = task_violated_guard(code, reason_code, exit_reason); + } + os_reason_free(exit_reason); + } else { + /* + * We use SIGABRT (rather than calling exit directly from here) so that + * the debugger can catch abort_with_{reason,payload} calls. + */ + psignal_try_thread_with_reason(p, current_thread(), SIGABRT, exit_reason); + } + + switch (kr) { + case KERN_SUCCESS: + return 0; + case KERN_NOT_SUPPORTED: + return ENOTSUP; + case KERN_INVALID_ARGUMENT: + return EINVAL; + case KERN_RESOURCE_SHORTAGE: + default: + return EBUSY; + } +} + +int +abort_with_payload(struct proc *cur_proc, struct abort_with_payload_args *args, + __unused void *retval) +{ + abort_with_payload_internal(cur_proc, args->reason_namespace, + args->reason_code, args->payload, args->payload_size, + args->reason_string, args->reason_flags, 0); + + return 0; +} + +int +os_fault_with_payload(struct proc *cur_proc, + struct os_fault_with_payload_args *args, __unused int *retval) +{ + return abort_with_payload_internal(cur_proc, args->reason_namespace, + args->reason_code, args->payload, args->payload_size, + args->reason_string, args->reason_flags, OS_REASON_IFLAG_USER_FAULT); +} + + /* * exit -- * Death of process. */ +__attribute__((noreturn)) void -exit(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); + p->p_xhighbits = ((uint32_t)(uap->rval) & 0xFF000000) >> 24; + exit1(p, W_EXITCODE((uint32_t)uap->rval, 0), retval); - /* drop funnel before we return */ - thread_funnel_set(kernel_flock, FALSE); thread_exception_return(); /* NOTREACHED */ - while (TRUE) + while (TRUE) { thread_block(THREAD_CONTINUE_NULL); + } /* NOTREACHED */ } @@ -173,12 +853,29 @@ exit(struct proc *p, struct exit_args *uap, int *retval) * status and rusage for wait(). Check for child processes and orphan them. */ int -exit1(struct proc *p, int rv, int *retval) +exit1(proc_t p, int rv, int *retval) +{ + return exit1_internal(p, rv, retval, TRUE, TRUE, 0); +} + +int +exit1_internal(proc_t p, int rv, int *retval, boolean_t thread_can_terminate, boolean_t perf_notify, + int jetsam_flags) +{ + return exit_with_reason(p, rv, retval, thread_can_terminate, perf_notify, jetsam_flags, OS_REASON_NULL); +} + +/* + * NOTE: exit_with_reason drops a reference on the passed exit_reason + */ +int +exit_with_reason(proc_t p, int rv, int *retval, boolean_t thread_can_terminate, boolean_t perf_notify, + int jetsam_flags, struct os_reason *exit_reason) { thread_t self = current_thread(); struct task *task = p->task; - register int s; struct uthread *ut; + int error = 0; /* * If a thread in this task has already @@ -186,123 +883,361 @@ exit1(struct proc *p, int rv, int *retval) * right here. */ - ut = get_bsdthread_info(self); - if (ut->uu_flag & UT_VFORK) { - vfork_exit(p, rv); - vfork_return(self, p->p_pptr, p , retval); - unix_syscall_return(0); - /* NOT REACHED */ - } - AUDIT_SYSCALL_EXIT(0, p, ut); /* Exit is always successfull */ - signal_lock(p); + ut = get_bsdthread_info(self); + if ((p == current_proc()) && + (ut->uu_flag & UT_VFORK)) { + os_reason_free(exit_reason); + if (!thread_can_terminate) { + return EINVAL; + } + + vfork_exit(p, rv); + vfork_return(p, retval, p->p_pid); + unix_syscall_return(0); + /* NOT REACHED */ + } + + /* + * 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(). + */ + + /* + * The BSM token contains two components: an exit status as passed + * to exit(), and a return value to indicate what sort of exit it + * was. The exit status is WEXITSTATUS(rv), but it's not clear + * what the return value is. + */ + AUDIT_ARG(exit, WEXITSTATUS(rv), 0); + /* + * TODO: what to audit here when jetsam calls exit and the uthread, + * 'ut' does not belong to the proc, 'p'. + */ + AUDIT_SYSCALL_EXIT(SYS_exit, p, ut, 0); /* Exit is always successfull */ + + DTRACE_PROC1(exit, int, CLD_EXITED); + + /* mark process is going to exit and pull out of DBG/disk throttle */ + /* TODO: This should be done after becoming exit thread */ + proc_set_task_policy(p->task, TASK_POLICY_ATTRIBUTE, + TASK_POLICY_TERMINATED, TASK_POLICY_ENABLE); + + proc_lock(p); + error = proc_transstart(p, 1, (jetsam_flags ? 1 : 0)); + if (error == EDEADLK) { + /* + * If proc_transstart() returns EDEADLK, then another thread + * is either exec'ing or exiting. Return an error and allow + * the other thread to continue. + */ + proc_unlock(p); + os_reason_free(exit_reason); + if (current_proc() == p) { + if (p->exit_thread == self) { + printf("exit_thread failed to exit, leaving process %s[%d] in unkillable limbo\n", + p->p_comm, p->p_pid); + } + + if (thread_can_terminate) { + thread_exception_return(); + } + } + + return error; + } + while (p->exit_thread != self) { if (sig_try_locked(p) <= 0) { + proc_transend(p, 1); + os_reason_free(exit_reason); + if (get_threadtask(self) != task) { - signal_unlock(p); - return(0); - } - signal_unlock(p); + proc_unlock(p); + return 0; + } + proc_unlock(p); + thread_terminate(self); - thread_funnel_set(kernel_flock, FALSE); + if (!thread_can_terminate) { + return 0; + } + thread_exception_return(); /* NOTREACHED */ } sig_lock_to_exit(p); } - 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); + + if (exit_reason != OS_REASON_NULL) { + KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_PROC, BSD_PROC_EXITREASON_COMMIT) | DBG_FUNC_NONE, + p->p_pid, exit_reason->osr_namespace, + exit_reason->osr_code, 0, 0); } - s = splsched(); - p->p_flag |= P_WEXIT; - splx(s); - proc_prepareexit(p); + assert(p->p_exit_reason == OS_REASON_NULL); + p->p_exit_reason = exit_reason; + + p->p_lflag |= P_LEXIT; p->p_xstat = rv; + p->p_lflag |= jetsam_flags; + + proc_transend(p, 1); + proc_unlock(p); - /* task terminate will call proc_terminate and that cleans it up */ + proc_prepareexit(p, rv, perf_notify); + + /* Last thread to terminate will call proc_exit() */ task_terminate_internal(task); - return(0); + return 0; } +#if CONFIG_MEMORYSTATUS +/* + * Remove this process from jetsam bands for freezing or exiting. Note this will block, if the process + * is currently being frozen. + * The proc_list_lock is held by the caller. + * NB: If the process should be ineligible for future freezing or jetsaming the caller should first set + * the p_listflag P_LIST_EXITED bit. + */ +static void +proc_memorystatus_remove(proc_t p) +{ + LCK_MTX_ASSERT(proc_list_mlock, LCK_MTX_ASSERT_OWNED); + while (memorystatus_remove(p) == EAGAIN) { + os_log(OS_LOG_DEFAULT, "memorystatus_remove: Process[%d] tried to exit while being frozen. Blocking exit until freeze completes.", p->p_pid); + msleep(&p->p_memstat_state, proc_list_mlock, PWAIT, "proc_memorystatus_remove", NULL); + } +} +#endif + void -proc_prepareexit(struct proc *p) +proc_prepareexit(proc_t p, int rv, boolean_t perf_notify) { + mach_exception_data_type_t code = 0, subcode = 0; + struct uthread *ut; - exception_data_t code[EXCEPTION_CODE_MAX]; thread_t self = current_thread(); + ut = get_bsdthread_info(self); + struct rusage_superset *rup; + int kr = 0; + int create_corpse = FALSE; - code[0] = (exception_data_t)0xFF000001; /* Set terminate code */ - code[1] = (exception_data_t)p->p_pid; /* Pass out the pid */ - /* Notify the perf server */ - (void)sys_perf_notify(p->task, (exception_data_t)&code, 2); + if (p == initproc) { + launchd_crashed_panic(p, rv); + /* NOTREACHED */ + } + /* + * Generate a corefile/crashlog if: + * The process doesn't have an exit reason that indicates no crash report should be created + * AND any of the following are true: + * - The process was terminated due to a fatal signal that generates a core + * - The process was killed due to a code signing violation + * - The process has an exit reason that indicates we should generate a crash report + * + * The first condition is necessary because abort_with_reason()/payload() use SIGABRT + * (which normally triggers a core) but may indicate that no crash report should be created. + */ + if (!(PROC_HAS_EXITREASON(p) && (PROC_EXITREASON_FLAGS(p) & OS_REASON_FLAG_NO_CRASH_REPORT)) && + (hassigprop(WTERMSIG(rv), SA_CORE) || ((p->p_csflags & CS_KILLED) != 0) || + (PROC_HAS_EXITREASON(p) && (PROC_EXITREASON_FLAGS(p) & + OS_REASON_FLAG_GENERATE_CRASH_REPORT)))) { + /* + * 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; + + kr = task_exception_notify(EXC_CRASH, code, subcode); + + /* Nobody handled EXC_CRASH?? remember to make corpse */ + if (kr != 0) { + create_corpse = TRUE; + } + } + +skipcheck: + /* Notify the perf server? */ + if (perf_notify) { + (void)sys_perf_notify(self, p->p_pid); + } + + + /* stash the usage into corpse data if making_corpse == true */ + if (create_corpse == TRUE) { + kr = task_mark_corpse(p->task); + if (kr != KERN_SUCCESS) { + if (kr == KERN_NO_SPACE) { + printf("Process[%d] has no vm space for corpse info.\n", p->p_pid); + } else if (kr == KERN_NOT_SUPPORTED) { + printf("Process[%d] was destined to be corpse. But corpse is disabled by config.\n", p->p_pid); + } else { + printf("Process[%d] crashed: %s. Too many corpses being created.\n", p->p_pid, p->p_comm); + } + create_corpse = FALSE; + } + } + + /* + * Before this process becomes a zombie, stash resource usage + * stats in the proc for external observers to query + * via proc_pid_rusage(). + * + * If the zombie allocation fails, just punt the stats. + */ + rup = zalloc(zombie_zone); + gather_rusage_info(p, &rup->ri, RUSAGE_INFO_CURRENT); + rup->ri.ri_phys_footprint = 0; + rup->ri.ri_proc_exit_abstime = mach_absolute_time(); + /* + * Make the rusage_info visible to external observers + * only after it has been completely filled in. + */ + p->p_ru = rup; + + if (create_corpse) { + int est_knotes = 0, num_knotes = 0; + uint64_t *buffer = NULL; + uint32_t buf_size = 0; + + /* Get all the udata pointers from kqueue */ + est_knotes = kevent_proc_copy_uptrs(p, NULL, 0); + if (est_knotes > 0) { + buf_size = (uint32_t)((est_knotes + 32) * sizeof(uint64_t)); + buffer = kheap_alloc(KHEAP_TEMP, buf_size, Z_WAITOK); + num_knotes = kevent_proc_copy_uptrs(p, buffer, buf_size); + if (num_knotes > est_knotes + 32) { + num_knotes = est_knotes + 32; + } + } + + /* Update the code, subcode based on exit reason */ + proc_update_corpse_exception_codes(p, &code, &subcode); + populate_corpse_crashinfo(p, p->task, rup, + code, subcode, buffer, num_knotes, NULL); + if (buffer != NULL) { + kheap_free(KHEAP_TEMP, buffer, buf_size); + } + } /* * 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(); + +#if CONFIG_MEMORYSTATUS + proc_memorystatus_remove(p); +#endif + LIST_REMOVE(p, p_list); - LIST_INSERT_HEAD(&zombproc, p, p_list); /* Place onto zombproc. */ - 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); + proc_lock(p); + p->p_lflag &= ~(P_LTRACED | P_LPPWAIT); p->p_sigignore = ~(sigcantmask); - p->p_siglist = 0; - ut = get_bsdthread_info(self); ut->uu_siglist = 0; - untimeout(realitexpire, (caddr_t)p->p_pid); + proc_unlock(p); } -void -proc_exit(struct proc *p) +void +proc_exit(proc_t p) { - register struct proc *q, *nq, *pp; + proc_t q; + proc_t pp; struct task *task = p->task; - register int s; - boolean_t funnel_state; + vnode_t tvp = NULLVP; + struct pgrp * pg; + struct session *sessp; + struct uthread * uth; + pid_t pid; + int exitval; + int knote_hint; + + uth = current_uthread(); + + proc_lock(p); + proc_transstart(p, 1, 0); + if (!(p->p_lflag & P_LEXIT)) { + /* + * This can happen if a thread_terminate() occurs + * in a single-threaded process. + */ + p->p_lflag |= P_LEXIT; + proc_transend(p, 1); + proc_unlock(p); + proc_prepareexit(p, 0, TRUE); + (void) task_terminate_internal(task); + proc_lock(p); + } else { + proc_transend(p, 1); + } - /* This can happen if thread_terminate of the single thread - * process - */ + p->p_lflag |= P_LPEXIT; - 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); + /* + * Other kernel threads may be in the middle of signalling this process. + * Wait for those threads to wrap it up before making the process + * disappear on them. + */ + if ((p->p_lflag & P_LINSIGNAL) || (p->p_sigwaitcnt > 0)) { + p->p_sigwaitcnt++; + while ((p->p_lflag & P_LINSIGNAL) || (p->p_sigwaitcnt > 1)) { + msleep(&p->p_sigmask, &p->p_mlock, PWAIT, "proc_sigdrain", NULL); + } + p->p_sigwaitcnt--; } - p->p_lflag |= P_LPEXIT; - /* 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_unlock(p); + pid = p->p_pid; + exitval = p->p_xstat; + KERNEL_DEBUG_CONSTANT_IST(KDEBUG_COMMON, + BSDDBG_CODE(DBG_BSD_PROC, BSD_PROC_EXIT) | DBG_FUNC_START, + pid, exitval, 0, 0, 0); + +#if CONFIG_DTRACE + dtrace_proc_exit(p); +#endif /* * need to cancel async IO requests that can be cancelled and wait for those * already active. MAY BLOCK! */ - - p->p_lflag |= P_LREFDRAIN; - while (p->p_internalref) { - p->p_lflag |= P_LREFDRAINWAIT; - msleep(&p->p_internalref, (lck_mtx_t *)0, 0, "proc_refdrain", 0) ; - } - p->p_lflag &= ~P_LREFDRAIN; - p->p_lflag |= P_LREFDEAD; + + proc_refdrain(p); + + /* if any pending cpu limits action, clear it */ + task_clear_cpuusage(p->task, TRUE); + + workq_mark_exiting(p); _aio_exit( p ); @@ -312,18 +1247,54 @@ proc_exit(struct proc *p) */ fdfree(p); + /* + * Once all the knotes, kqueues & workloops are destroyed, get rid of the + * workqueue. + */ + workq_exit(p); + + if (uth->uu_lowpri_window) { + /* + * task is marked as a low priority I/O type + * and the I/O we issued while in 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(0); + } + + if (p->p_lflag & P_LNSPACE_RESOLVER) { + /* + * The namespace resolver is exiting; there may be + * outstanding materialization requests to clean up. + */ + nspace_resolver_exited(p); + } + +#if SYSV_SHM /* Close ref SYSV Shared memory*/ - if (p->vm_shm) + if (p->vm_shm) { shmexit(p); + } +#endif +#if SYSV_SEM /* Release SYSV semaphores */ semexit(p); - - if (SESS_LEADER(p)) { - register struct session *sp = p->p_session; +#endif + +#if PSYNCH + pth_proc_hashdelete(p); +#endif /* PSYNCH */ - if (sp->s_ttyvp) { + sessp = proc_session(p); + if (SESS_LEADER(p, sessp)) { + if (sessp->s_ttyvp != NULLVP) { struct vnode *ttyvp; + int ttyvid; + int cttyflag = 0; struct vfs_context context; + struct tty *tp; /* * Controlling process. @@ -331,112 +1302,204 @@ 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); - /* - * The tty could have been revoked - * if we blocked. - */ - context.vc_proc = p; + session_lock(sessp); + tp = SESSION_TP(sessp); + if ((tp != TTY_NULL) && (tp->t_session == sessp)) { + session_unlock(sessp); + + tty_pgsignal(tp, SIGHUP, 1); + + session_lock(sessp); + tp = SESSION_TP(sessp); + } + cttyflag = sessp->s_flags & S_CTTYREF; + sessp->s_flags &= ~S_CTTYREF; + ttyvp = sessp->s_ttyvp; + ttyvid = sessp->s_ttyvid; + sessp->s_ttyvp = NULLVP; + sessp->s_ttyvid = 0; + sessp->s_ttyp = TTY_NULL; + sessp->s_ttypgrpid = NO_PID; + session_unlock(sessp); + + if ((ttyvp != NULLVP) && (vnode_getwithvid(ttyvp, ttyvid) == 0)) { + if (tp != TTY_NULL) { + tty_lock(tp); + (void) ttywait(tp); + tty_unlock(tp); + } + + context.vc_thread = NULL; context.vc_ucred = kauth_cred_proc_ref(p); - if (sp->s_ttyvp) - VNOP_REVOKE(sp->s_ttyvp, REVOKEALL, &context); + VNOP_REVOKE(ttyvp, REVOKEALL, &context); + if (cttyflag) { + /* + * Release the extra usecount taken in cttyopen. + * usecount should be released after VNOP_REVOKE is called. + * This usecount was taken to ensure that + * the VNOP_REVOKE results in a close to + * the tty since cttyclose is a no-op. + */ + vnode_rele(ttyvp); + } + vnode_put(ttyvp); kauth_cred_unref(&context.vc_ucred); + ttyvp = NULLVP; } - ttyvp = sp->s_ttyvp; - sp->s_ttyvp = NULL; - if (ttyvp) { - vnode_rele(ttyvp); + if (tp) { + ttyfree(tp); } - /* - * 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; + session_lock(sessp); + sessp->s_leader = NULL; + session_unlock(sessp); } + session_rele(sessp); - fixjobc(p, p->p_pgrp, 0); - p->p_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; - (void)acct_process(p); + pg = proc_pgrp(p); + fixjobc(p, pg, 0); + pg_rele(pg); -#if KTRACE - /* - * release trace file + /* + * Change RLIMIT_FSIZE for accounting/debugging. proc_limitsetcur_internal() will COW the current plimit + * before making changes if the current plimit is shared. The COW'ed plimit will be freed + * below by calling proc_limitdrop(). */ - p->p_traceflag = 0; /* don't trace the vnode_put() */ - if (p->p_tracep) { - struct vnode *tvp = p->p_tracep; - p->p_tracep = NULL; - vnode_rele(tvp); + proc_limitsetcur_internal(p, RLIMIT_FSIZE, RLIM_INFINITY); + + (void)acct_process(p); + + proc_list_lock(); + + if ((p->p_listflag & P_LIST_EXITCOUNT) == P_LIST_EXITCOUNT) { + p->p_listflag &= ~P_LIST_EXITCOUNT; + proc_shutdown_exitcount--; + if (proc_shutdown_exitcount == 0) { + wakeup(&proc_shutdown_exitcount); + } } -#endif - while (q = p->p_children.lh_first) { - 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) { + /* wait till parentrefs are dropped and grant no more */ + proc_childdrainstart(p); + while ((q = p->p_children.lh_first) != NULL) { + int reparentedtoinit = (q->p_listflag & P_LIST_DEADPARENT) ? 1 : 0; + 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, reparentedtoinit, 1, 0); + } else { + /* + * Traced processes are killed + * since their existence means someone is messing up. + */ + if (q->p_lflag & P_LTRACED) { + struct proc *opp; + /* - * 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. + * Take a reference on the child process to + * ensure it doesn't exit and disappear between + * the time we drop the list_lock and attempt + * to acquire its proc_lock. */ - thread_resume((thread_t)q->sigwait_thread); - clear_wait(q->sigwait_thread, THREAD_INTERRUPTED); - threadsignal((thread_t)q->sigwait_thread, SIGKILL, 0); + if (proc_ref_locked(q) != q) { + continue; + } + + proc_list_unlock(); + + opp = proc_find(q->p_oppid); + if (opp != PROC_NULL) { + proc_list_lock(); + q->p_oppid = 0; + proc_list_unlock(); + proc_reparentlocked(q, opp, 0, 0); + proc_rele(opp); + } else { + /* original parent exited while traced */ + proc_list_lock(); + q->p_listflag |= P_LIST_DEADPARENT; + q->p_oppid = 0; + proc_list_unlock(); + proc_reparentlocked(q, initproc, 0, 0); + } + + proc_lock(q); + q->p_lflag &= ~P_LTRACED; + + if (q->sigwait_thread) { + thread_t thread = 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); + clear_wait(thread, THREAD_INTERRUPTED); + threadsignal(thread, SIGKILL, 0, TRUE); + } else { + proc_unlock(q); + } + + psignal(q, SIGKILL); + proc_list_lock(); + proc_rele_locked(q); + } else { + q->p_listflag |= P_LIST_DEADPARENT; + proc_reparentlocked(q, initproc, 0, 1); } - psignal(q, SIGKILL); } } + proc_childdrainend(p); + proc_list_unlock(); + +#if CONFIG_MACF + /* + * Notify MAC policies that proc is dead. + * This should be replaced with proper label management + * (rdar://problem/32126399). + */ + mac_proc_notify_exit(p); +#endif + + /* + * 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. If we were unable to allocate a zombie * structure, this information is lost. */ 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); - - if (task) { - task_basic_info_data_t tinfo; - task_thread_times_info_data_t ttimesinfo; - int task_info_stuff, task_ttimes_stuff; - struct timeval ut,st; - - task_info_stuff = TASK_BASIC_INFO_COUNT; - task_info(task, TASK_BASIC_INFO, - (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; - - task_ttimes_stuff = TASK_THREAD_TIMES_INFO_COUNT; - task_info(task, TASK_THREAD_TIMES_INFO, - (task_info_t)&ttimesinfo, &task_ttimes_stuff); - - ut.tv_sec = ttimesinfo.user_time.seconds; - ut.tv_usec = ttimesinfo.user_time.microseconds; - 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); - } + calcru(p, &p->p_stats->p_ru.ru_utime, &p->p_stats->p_ru.ru_stime, NULL); + p->p_ru->ru = p->p_stats->p_ru; - ruadd(p->p_ru, &p->p_stats->p_cru); + ruadd(&(p->p_ru->ru), &p->p_stats->p_cru); } /* @@ -455,18 +1518,18 @@ proc_exit(struct proc *p) } } + proc_free_realitimer(p); + /* * Other substructures are freed from wait(). */ - FREE_ZONE(p->p_stats, sizeof *p->p_stats, M_SUBPROC); + zfree(proc_stats_zone, p->p_stats); p->p_stats = NULL; - FREE_ZONE(p->p_sigacts, sizeof *p->p_sigacts, M_SUBPROC); + zfree(proc_sigacts_zone, p->p_sigacts); p->p_sigacts = NULL; - if (--p->p_limit->p_refcnt == 0) - FREE_ZONE(p->p_limit, sizeof *p->p_limit, M_SUBPROC); - p->p_limit = NULL; + proc_limitdrop(p); /* * Finish up by terminating the task @@ -474,52 +1537,133 @@ proc_exit(struct proc *p) * member of the task exiting). */ p->task = TASK_NULL; - //task->proc = NULL; set_bsdtask_info(task, NULL); - KNOTE(&p->p_klist, NOTE_EXIT); + knote_hint = NOTE_EXIT | (p->p_xstat & 0xffff); + proc_knote(p, knote_hint); + /* 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 *opp = p->p_pptr; + pp = proc_parent(p); + if (pp->p_flag & P_NOCLDWAIT) { + if (p->p_ru != NULL) { + proc_lock(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. + */ + ruadd(&pp->p_stats->p_cru, &p->p_ru->ru); +#endif /* !3839178 */ + update_rusage_info_child(&pp->p_stats->ri_child, &p->p_ru->ri); + proc_unlock(pp); + } + /* kernel can reap this one, no need to move it to launchd */ + proc_list_lock(); + p->p_listflag |= P_LIST_DEADPARENT; + proc_list_unlock(); + } + if ((p->p_listflag & P_LIST_DEADPARENT) == 0 || p->p_oppid) { + if (pp != initproc) { + proc_lock(pp); + pp->si_pid = p->p_pid; + pp->p_xhighbits = p->p_xhighbits; + p->p_xhighbits = 0; + 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 = kauth_cred_getruid(p->p_ucred); + 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 + */ + DTRACE_PROC2(exited, proc_t, p, int, exitval); + KERNEL_DEBUG_CONSTANT_IST(KDEBUG_COMMON, + BSDDBG_CODE(DBG_BSD_PROC, BSD_PROC_EXIT) | DBG_FUNC_END, + pid, exitval, 0, 0, 0); + p->p_stat = SZOMB; /* - * Add child resource usage to parent before giving - * zombie to init. If we were unable to allocate a - * zombie structure, this information is lost. + * The current process can be reaped so, no one + * can depend on this */ - if (p->p_ru != NULL) - ruadd(&p->p_pptr->p_stats->p_cru, p->p_ru); - proc_reparent(p, initproc); - /* If there are no more children wakeup parent */ - if (LIST_EMPTY(&opp->p_children)) - wakeup((caddr_t)opp); - } - /* 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_ucred->cr_ruid; - } - /* mark as a zombie */ - p->p_stat = SZOMB; + psignal(pp, SIGCHLD); - 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 + */ + DTRACE_PROC2(exited, proc_t, p, int, exitval); + proc_list_lock(); + KERNEL_DEBUG_CONSTANT_IST(KDEBUG_COMMON, + BSDDBG_CODE(DBG_BSD_PROC, BSD_PROC_EXIT) | DBG_FUNC_END, + pid, exitval, 0, 0, 0); + /* 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_stat = SZOMB; + p->p_listflag |= P_LIST_WAITING; - /* and now wakeup the parent */ - wakeup((caddr_t)p->p_pptr); + /* + * 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, 0, 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(0); + } - (void) thread_funnel_set(kernel_flock, funnel_state); + proc_rele(pp); } /* - * reap_child_process + * reap_child_locked * * Description: Given a process from which all status information needed * has already been extracted, if the process is a ptrace @@ -527,139 +1671,294 @@ proc_exit(struct proc *p) * parent, else recover all resources remaining associated * with it. * - * Parameters: struct proc *parent Parent of process being reaped - * struct proc *child Process to reap + * 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_process(struct proc *parent, struct proc *child) +reap_child_locked(proc_t parent, proc_t child, int deadparent, int reparentedtoinit, int locked, int droplock) { - struct proc *trace_parent; /* Traced parent process, if tracing */ - struct vnode *tvp; /* Traced vnode pointer, if used */ + proc_t trace_parent = PROC_NULL; /* Traced parent process, if tracing */ + + if (locked == 1) { + proc_list_unlock(); + } /* * If we got the child via a ptrace 'attach', * we need to give it back to the old parent. + * + * Exception: someone who has been reparented to launchd before being + * ptraced can simply be reaped, refer to radar 5677288 + * p_oppid -> ptraced + * trace_parent == initproc -> away from launchd + * reparentedtoinit -> came to launchd by reparenting */ - if (child->p_oppid && (trace_parent = pfind(child->p_oppid))) { + if (child->p_oppid) { + int knote_hint; + pid_t oppid; + + proc_lock(child); + oppid = child->p_oppid; child->p_oppid = 0; - proc_reparent(child, trace_parent); - if (trace_parent != initproc) { - 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; + knote_hint = NOTE_EXIT | (child->p_xstat & 0xffff); + proc_unlock(child); + + if ((trace_parent = proc_find(oppid)) + && !((trace_parent == initproc) && reparentedtoinit)) { + 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 = kauth_cred_getruid(child->p_ucred); + proc_unlock(trace_parent); + } + proc_reparentlocked(child, trace_parent, 1, 0); + + /* resend knote to original parent (and others) after reparenting */ + proc_knote(child, knote_hint); + + 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; + } + + /* + * If we can't reparent (e.g. the original parent exited while child was being debugged, or + * original parent is the same as the debugger currently exiting), we still need to satisfy + * the knote lifecycle for other observers on the system. While the debugger was attached, + * the NOTE_EXIT would not have been broadcast during initial child termination. + */ + proc_knote(child, knote_hint); + + if (trace_parent != PROC_NULL) { + proc_rele(trace_parent); } - psignal(trace_parent, SIGCHLD); - wakeup((caddr_t)trace_parent); - return (0); } + +#pragma clang diagnostic push +#pragma clang diagnostic ignored "-Wdeprecated-declarations" + proc_knote(child, NOTE_REAP); +#pragma clang diagnostic pop + + proc_knote_drain(child); + child->p_xstat = 0; if (child->p_ru) { - ruadd(&parent->p_stats->p_cru, child->p_ru); - FREE_ZONE(child->p_ru, sizeof *child->p_ru, M_ZOMBIE); + 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->ru); + update_rusage_info_child(&parent->p_stats->ri_child, &child->p_ru->ri); + proc_unlock(parent); + zfree(zombie_zone, child->p_ru); child->p_ru = NULL; } else { printf("Warning : lost p_ru for %s\n", child->p_comm); } + AUDIT_SESSION_PROCEXIT(child); + /* * 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); +#if CONFIG_PERSONAS + /* + * persona_proc_drop calls chgproccnt(-1) on the persona uid, + * and (+1) on the child->p_ucred uid + */ + persona_proc_drop(child); +#endif + (void)chgproccnt(kauth_cred_getruid(child->p_ucred), -1); + + os_reason_free(child->p_exit_reason); /* - * Free up credentials. + * Finally finished with old proc entry. + * Unlink it from its process group and free it. */ - if (IS_VALID_CRED(child->p_ucred)) { - kauth_cred_unref(&child->p_ucred); + leavepgrp(child); + + 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--; + + if (deadparent) { + /* + * If a child zombie is being reaped because its parent + * is exiting, make sure we update the list flag + */ + child->p_listflag |= P_LIST_DEADPARENT; + } + + proc_list_unlock(); /* - * Release reference to text vnode + * Free up credentials. */ - tvp = child->p_textvp; - child->p_textvp = NULL; - if (tvp) { - vnode_rele(tvp); + if (IS_VALID_CRED(child->p_ucred)) { + kauth_cred_t tmp_ucred = child->p_ucred; + kauth_cred_unref(&tmp_ucred); + child->p_ucred = NOCRED; + } + + lck_mtx_destroy(&child->p_mlock, proc_mlock_grp); + lck_mtx_destroy(&child->p_ucred_mlock, proc_ucred_mlock_grp); + lck_mtx_destroy(&child->p_fdmlock, proc_fdmlock_grp); +#if CONFIG_DTRACE + lck_mtx_destroy(&child->p_dtrace_sprlock, proc_lck_grp); +#endif + lck_spin_destroy(&child->p_slock, proc_slock_grp); + + zfree(proc_zone, child); + if ((locked == 1) && (droplock == 0)) { + proc_list_lock(); } - /* - * Finally finished with old proc entry. - * Unlink it from its process group and free it. - */ - leavepgrp(child); - LIST_REMOVE(child, p_list); /* off zombproc */ - LIST_REMOVE(child, p_sibling); - child->p_lflag &= ~P_LWAITING; - wakeup(&child->p_stat); - lck_mtx_destroy(&child->p_mlock, proc_lck_grp); - lck_mtx_destroy(&child->p_fdmlock, proc_lck_grp); - FREE_ZONE(child, sizeof *child, M_PROC); - nprocs--; - return (1); + return 1; } int wait1continue(int result) { - void *vt; + proc_t p; thread_t thread; + uthread_t uth; + struct _wait4_data *wait4_data; + struct wait4_nocancel_args *uap; int *retval; - struct proc *p; - if (result) - return(result); + if (result) { + return result; + } p = current_proc(); thread = current_thread(); - vt = get_bsduthreadarg(thread); - retval = get_bsduthreadrval(thread); - return(wait4((struct proc *)p, (struct wait4_args *)vt, retval)); + uth = (struct uthread *)get_bsdthread_info(thread); + + wait4_data = &uth->uu_save.uus_wait4_data; + uap = wait4_data->args; + retval = wait4_data->retval; + return wait4_nocancel(p, uap, retval); +} + +int +wait4(proc_t q, struct wait4_args *uap, int32_t *retval) +{ + __pthread_testcancel(1); + return wait4_nocancel(q, (struct wait4_nocancel_args *)uap, retval); } int -wait4(struct proc *q, struct wait4_args *uap, register_t *retval) +wait4_nocancel(proc_t q, struct wait4_nocancel_args *uap, int32_t *retval) { - register int nfound; - register struct proc *p; + int nfound; + int sibling_count; + proc_t p; int status, error; + uthread_t uth; + struct _wait4_data *wait4_data; + + AUDIT_ARG(pid, uap->pid); - if (uap->pid == 0) - uap->pid = -q->p_pgid; + if (uap->pid == 0) { + 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) { + sibling_count = 0; + + PCHILDREN_FOREACH(q, p) { + if (p->p_sibling.le_next != 0) { + sibling_count++; + } if (uap->pid != WAIT_ANY && p->p_pid != uap->pid && - p->p_pgid != -(uap->pid)) + p->p_pgrpid != -(uap->pid)) { continue; + } + nfound++; /* XXX This is racy because we don't get the lock!!!! */ - if (p->p_lflag & P_LWAITING) { - (void)tsleep(&p->p_stat, PWAIT, "waitcoll", 0); - goto loop; + if (p->p_listflag & P_LIST_WAITING) { + /* we're not using a continuation here but we still need to stash + * the args for stackshot. */ + uth = current_uthread(); + wait4_data = &uth->uu_save.uus_wait4_data; + wait4_data->args = uap; + thread_set_pending_block_hint(current_thread(), kThreadWaitOnProcess); + + (void)msleep(&p->p_stat, proc_list_mlock, PWAIT, "waitcoll", 0); + goto loop1; } - p->p_lflag |= P_LWAITING; /* only allow single thread to wait() */ + p->p_listflag |= P_LIST_WAITING; /* only allow single thread to wait() */ + if (p->p_stat == SZOMB) { + int reparentedtoinit = (p->p_listflag & P_LIST_DEADPARENT) ? 1 : 0; + + 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 */ + /* 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)); + uap->status, + sizeof(status)); if (error) { - p->p_lflag &= ~P_LWAITING; - wakeup(&p->p_stat); - return (error); + goto out; } } if (uap->rusage) { @@ -667,83 +1966,162 @@ loop: error = ENOMEM; } else { if (IS_64BIT_PROCESS(q)) { - struct user_rusage my_rusage; - munge_rusage(p->p_ru, &my_rusage); + struct user64_rusage my_rusage = {}; + munge_user64_rusage(&p->p_ru->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)); + uap->rusage, + sizeof(my_rusage)); + } else { + struct user32_rusage my_rusage = {}; + munge_user32_rusage(&p->p_ru->ru, &my_rusage); + error = copyout((caddr_t)&my_rusage, + uap->rusage, + sizeof(my_rusage)); } } /* information unavailable? */ if (error) { - p->p_lflag &= ~P_LWAITING; - wakeup(&p->p_stat); - return (error); + goto out; } } - /* Clean up */ - if (!reap_child_process(q, p)) { - p->p_lflag &= ~P_LWAITING; - wakeup(&p->p_stat); + /* Conformance change for 6577252. + * When SIGCHLD is blocked and wait() returns because the status + * of a child process is available and there are no other + * children processes, then any pending SIGCHLD signal is cleared. + */ + if (sibling_count == 0) { + int mask = sigmask(SIGCHLD); + uth = current_uthread(); + + if ((uth->uu_sigmask & mask) != 0) { + /* we are blocking SIGCHLD signals. clear any pending SIGCHLD. + * This locking looks funny but it is protecting access to the + * thread via p_uthlist. + */ + proc_lock(q); + uth->uu_siglist &= ~mask; /* clear pending signal */ + proc_unlock(q); + } } - return (0); + /* Clean up */ + (void)reap_child_locked(q, p, 0, reparentedtoinit, 0, 0); + + 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; + 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, + 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), &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 + } else { error = 0; - p->p_lflag &= ~P_LWAITING; - wakeup(&p->p_stat); - return (error); + } + goto out; } - p->p_lflag &= ~P_LWAITING; + p->p_listflag &= ~P_LIST_WAITING; wakeup(&p->p_stat); } - if (nfound == 0) - return (ECHILD); + /* 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; - return (0); + proc_list_unlock(); + return 0; } - if ((error = tsleep0((caddr_t)q, PWAIT | PCATCH, "wait", 0, wait1continue))) - return (error); + /* Save arguments for continuation. Backing storage is in uthread->uu_arg, and will not be deallocated */ + uth = current_uthread(); + wait4_data = &uth->uu_save.uus_wait4_data; + wait4_data->args = uap; + wait4_data->retval = retval; + + thread_set_pending_block_hint(current_thread(), kThreadWaitOnProcess); + 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; } +#if DEBUG +#define ASSERT_LCK_MTX_OWNED(lock) \ + lck_mtx_assert(lock, LCK_MTX_ASSERT_OWNED) +#else +#define ASSERT_LCK_MTX_OWNED(lock) /* nothing */ +#endif int waitidcontinue(int result) { - void *vt; + proc_t p; thread_t thread; + uthread_t uth; + struct _waitid_data *waitid_data; + struct waitid_nocancel_args *uap; int *retval; - struct proc *p; - if (result) - return(result); + if (result) { + return result; + } p = current_proc(); thread = current_thread(); - vt = get_bsduthreadarg(thread); - retval = get_bsduthreadrval(thread); - return(waitid((struct proc *)p, (struct waitid_args *)vt, retval)); + uth = (struct uthread *)get_bsdthread_info(thread); + + waitid_data = &uth->uu_save.uus_waitid_data; + uap = waitid_data->args; + retval = waitid_data->retval; + return waitid_nocancel(p, uap, retval); } /* @@ -752,7 +2130,7 @@ waitidcontinue(int result) * * 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 + * uap->infop Address of siginfo_t struct in * user space into which to return status * uap->options flag values * @@ -760,27 +2138,57 @@ waitidcontinue(int result) * !0 Error returning status to user space */ int -waitid(struct proc *q, struct waitid_args *uap, register_t *retval) +waitid(proc_t q, struct waitid_args *uap, int32_t *retval) { - user_siginfo_t collect64; /* siginfo data to return to caller */ + __pthread_testcancel(1); + return waitid_nocancel(q, (struct waitid_nocancel_args *)uap, retval); +} - register int nfound; - register struct proc *p; +int +waitid_nocancel(proc_t q, struct waitid_nocancel_args *uap, + __unused int32_t *retval) +{ + user_siginfo_t siginfo; /* siginfo data to return to caller */ + boolean_t caller64 = IS_64BIT_PROCESS(q); + int nfound; + proc_t p; int error; + uthread_t uth; + struct _waitid_data *waitid_data; + + if (uap->options == 0 || + (uap->options & ~(WNOHANG | WNOWAIT | WCONTINUED | WSTOPPED | WEXITED))) { + return EINVAL; /* bits set that aren't recognized */ + } + 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) + + PCHILDREN_FOREACH(q, p) { + 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_pgid != (pid_t)uap->id) + 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 */ + case P_ALL: /* any child */ break; } @@ -790,249 +2198,240 @@ loop: * Wait collision; go to sleep and restart; used to maintain * the single return for waited process guarantee. */ - if (p->p_lflag & P_LWAITING) { - (void)tsleep(&p->p_stat, PWAIT, "waitidcoll", 0); - goto loop; + if (p->p_listflag & P_LIST_WAITING) { + (void) msleep(&p->p_stat, proc_list_mlock, + PWAIT, "waitidcoll", 0); + goto loop1; } - p->p_lflag |= P_LWAITING; /* mark busy */ + 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)) + bzero(&siginfo, sizeof(siginfo)); + + switch (p->p_stat) { + case SZOMB: /* Exited */ + if (!(uap->options & WEXITED)) { break; + } + proc_list_unlock(); +#if CONFIG_MACF + if ((error = mac_proc_check_wait(q, p)) != 0) { + goto out; + } +#endif + siginfo.si_signo = SIGCHLD; + siginfo.si_pid = p->p_pid; - /* Collect "siginfo" information for caller */ - collect64.si_signo = 0; - collect64.si_code = 0; - collect64.si_errno = 0; - collect64.si_pid = 0; - collect64.si_uid = 0; - collect64.si_addr = 0; - collect64.si_status = p->p_xstat; - collect64.si_band = 0; - - if (IS_64BIT_PROCESS(p)) { - error = copyout((caddr_t)&collect64, - uap->infop, - sizeof(collect64)); + /* If the child terminated abnormally due to a signal, the signum + * needs to be preserved in the exit status. + */ + if (WIFSIGNALED(p->p_xstat)) { + siginfo.si_code = WCOREDUMP(p->p_xstat) ? + CLD_DUMPED : CLD_KILLED; + siginfo.si_status = WTERMSIG(p->p_xstat); } else { - siginfo_t collect; - siginfo_64to32(&collect64,&collect); - error = copyout((caddr_t)&collect, - uap->infop, - sizeof(collect)); + siginfo.si_code = CLD_EXITED; + siginfo.si_status = WEXITSTATUS(p->p_xstat) & 0x00FFFFFF; } - /* information unavailable? */ - if (error) { - p->p_lflag &= ~P_LWAITING; - wakeup(&p->p_stat); - return (error); + siginfo.si_status |= (((uint32_t)(p->p_xhighbits) << 24) & 0xFF000000); + p->p_xhighbits = 0; + + if ((error = copyoutsiginfo(&siginfo, + caller64, uap->infop)) != 0) { + goto out; } /* Prevent other process for waiting for this event? */ if (!(uap->options & WNOWAIT)) { - /* Clean up */ - if (!reap_child_process(q, p)) { - p->p_lflag &= ~P_LWAITING; - wakeup(&p->p_stat); - } + (void) reap_child_locked(q, p, 0, 0, 0, 0); + return 0; } + goto out; - return (0); - - case SSTOP: /* Stopped */ + case SSTOP: /* Stopped */ /* * If we are not interested in stopped processes, then * ignore this one. */ - if (!(uap->options & WSTOPPED)) + if (!(uap->options & WSTOPPED)) { break; + } /* * If someone has already waited it, we lost a race * to be the one to return status. */ - if ((p->p_flag & P_WAITED) != 0) + if ((p->p_lflag & P_LWAITED) != 0) { break; - - /* - * If this is not a traced process, and they haven't - * indicated an interest in untraced processes, then - * ignore this one. - */ - if (!(p->p_flag & P_TRACED) && !(uap->options & WUNTRACED)) - break; - - /* Collect "siginfo" information for caller */ - collect64.si_signo = 0; - collect64.si_code = 0; - collect64.si_errno = 0; - collect64.si_pid = 0; - collect64.si_uid = 0; - collect64.si_addr = 0; - collect64.si_status = 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)); } - /* information unavailable? */ - if (error) { - p->p_lflag &= ~P_LWAITING; - wakeup(&p->p_stat); - return (error); + proc_list_unlock(); +#if CONFIG_MACF + if ((error = mac_proc_check_wait(q, p)) != 0) { + goto out; + } +#endif + siginfo.si_signo = SIGCHLD; + siginfo.si_pid = p->p_pid; + siginfo.si_status = p->p_xstat; /* signal number */ + siginfo.si_code = CLD_STOPPED; + + if ((error = copyoutsiginfo(&siginfo, + caller64, uap->infop)) != 0) { + goto out; } /* Prevent other process for waiting for this event? */ if (!(uap->options & WNOWAIT)) { - p->p_flag |= P_WAITED; + proc_lock(p); + p->p_lflag |= P_LWAITED; + proc_unlock(p); } + goto out; - p->p_lflag &= ~P_LWAITING; - wakeup(&p->p_stat); - return (0); - - default: /* All others */ - /* ...meaning Continued */ - if (!(uap->options & WCONTINUED)) + default: /* All other states => Continued */ + if (!(uap->options & WCONTINUED)) { break; + } /* * 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(). */ - if ((p->p_flag & P_CONTINUED) == 0) + if ((p->p_flag & P_CONTINUED) == 0) { break; - - /* Collect "siginfo" information for caller */ - collect64.si_signo = 0; - collect64.si_code = 0; - collect64.si_errno = 0; - collect64.si_pid = 0; - collect64.si_uid = 0; - collect64.si_addr = 0; - collect64.si_status = 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)); } - /* information unavailable? */ - if (error) { - p->p_lflag &= ~P_LWAITING; - wakeup(&p->p_stat); - return (error); + proc_list_unlock(); +#if CONFIG_MACF + if ((error = mac_proc_check_wait(q, p)) != 0) { + goto out; + } +#endif + siginfo.si_signo = SIGCHLD; + siginfo.si_code = CLD_CONTINUED; + proc_lock(p); + siginfo.si_pid = p->p_contproc; + siginfo.si_status = p->p_xstat; + proc_unlock(p); + + if ((error = copyoutsiginfo(&siginfo, + caller64, uap->infop)) != 0) { + goto out; } /* Prevent other process for waiting for this event? */ if (!(uap->options & WNOWAIT)) { - p->p_flag &= ~P_CONTINUED; + OSBitAndAtomic(~((uint32_t)P_CONTINUED), + &p->p_flag); } - - p->p_lflag &= ~P_LWAITING; - wakeup(&p->p_stat); - return (0); - - break; + goto out; } - + ASSERT_LCK_MTX_OWNED(proc_list_mlock); /* Not a process we are interested in; go on to next child */ - p->p_lflag &= ~P_LWAITING; + + p->p_listflag &= ~P_LIST_WAITING; wakeup(&p->p_stat); } + ASSERT_LCK_MTX_OWNED(proc_list_mlock); /* No child processes that could possibly satisfy the request? */ - if (nfound == 0) - return (ECHILD); + + if (nfound == 0) { + proc_list_unlock(); + return ECHILD; + } if (uap->options & WNOHANG) { - retval[0] = 0; - return (0); + proc_list_unlock(); +#if CONFIG_MACF + if ((error = mac_proc_check_wait(q, p)) != 0) { + return error; + } +#endif + /* + * The state of the siginfo structure in this case + * is undefined. Some implementations bzero it, some + * (like here) leave it untouched for efficiency. + * + * Thus the most portable check for "no matching pid with + * WNOHANG" is to store a zero into si_pid before + * invocation, then check for a non-zero value afterwards. + */ + return 0; } - if ((error = tsleep0((caddr_t)q, PWAIT | PCATCH, "waitid", 0, waitidcontinue))) - return (error); + /* Save arguments for continuation. Backing storage is in uthread->uu_arg, and will not be deallocated */ + uth = current_uthread(); + waitid_data = &uth->uu_save.uus_waitid_data; + waitid_data->args = uap; + waitid_data->retval = retval; + + if ((error = msleep0(q, proc_list_mlock, + PWAIT | PCATCH | PDROP, "waitid", 0, waitidcontinue)) != 0) { + 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(struct proc *child, struct proc *parent) +proc_reparentlocked(proc_t child, proc_t parent, int signallable, int locked) { + proc_t oldparent = PROC_NULL; - if (child->p_pptr == parent) + 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 %p does not have a parent\n", 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_DEBUG + 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; - if (initproc == parent && child->p_stat == SZOMB) - psignal(initproc, SIGCHLD); -} - -/* - * Make the current process an "init" process, meaning - * that it doesn't have a parent, and that it won't be - * gunned down by kill(-1, 0). - */ -kern_return_t -init_process(__unused struct init_process_args *args) -{ - register struct proc *p = current_proc(); + proc_list_unlock(); - 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 ((signallable != 0) && (initproc == parent) && (child->p_stat == SZOMB)) { + psignal(initproc, SIGCHLD); + } + if (locked == 1) { + proc_list_lock(); } - - if (p->p_pid != 1 && p->p_pgid != p->p_pid) - enterpgrp(p, p->p_pid, 0); - p->p_flag |= P_SYSTEM; - - /* - * Take us out of the sibling chain, and - * out of our parent's child chain. - */ - LIST_REMOVE(p, p_sibling); - p->p_sibling.le_prev = NULL; - p->p_sibling.le_next = NULL; - p->p_pptr = kernproc; - - AUDIT_MACH_SYSCALL_EXIT(KERN_SUCCESS); - return(KERN_SUCCESS); } - /* * Exit: deallocate address space and other resources, change proc state * to zombie, and unlink proc from allproc and parent's lists. Save exit @@ -1040,15 +2439,19 @@ init_process(__unused struct init_process_args *args) */ void -vfork_exit(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) { thread_t self = current_thread(); #ifdef FIXME struct task *task = p->task; #endif - register int s; struct uthread *ut; - exception_data_t code[EXCEPTION_CODE_MAX]; /* * If a thread in this task has already @@ -1056,40 +2459,32 @@ vfork_exit(struct proc *p, int rv) * right here. */ - ut = get_bsdthread_info(self); -#ifdef FIXME - signal_lock(p); - while (p->exit_thread != self) { - if (sig_try_locked(p) <= 0) { - if (get_threadtask(self) != task) { - signal_unlock(p); - return; - } - signal_unlock(p); - thread_terminate(self); - thread_funnel_set(kernel_flock, FALSE); - thread_exception_return(); - /* NOTREACHED */ - } - sig_lock_to_exit(p); - } - 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); - } -#endif /* FIXME */ + ut = get_bsdthread_info(self); - s = splsched(); - p->p_flag |= P_WEXIT; - p->p_lflag |= P_LPEXIT; - splx(s); - code[0] = (exception_data_t)0xFF000001; /* Set terminate code */ - code[1] = (exception_data_t)p->p_pid; /* Pass out the pid */ - /* Notify the perf server */ - (void)sys_perf_notify(p->task, (exception_data_t)&code, 2); + 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; + } + 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); + } /* * Remove proc from allproc queue and from pidhash chain. @@ -1097,36 +2492,42 @@ panic("init died\nState at Last Exception:\n\n%s", init_task_failure_data); * Not doing causes things like mount() find this on allproc * in partially cleaned state. */ + + proc_list_lock(); + +#if CONFIG_MEMORYSTATUS + proc_memorystatus_remove(p); +#endif + LIST_REMOVE(p, p_list); - LIST_INSERT_HEAD(&zombproc, p, p_list); /* Place onto zombproc. */ - 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); + 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(); + + proc_lock(p); + p->p_xstat = rv; + p->p_lflag &= ~(P_LTRACED | P_LPPWAIT); p->p_sigignore = ~0; - p->p_siglist = 0; + proc_unlock(p); ut->uu_siglist = 0; - untimeout(realitexpire, (caddr_t)p->p_pid); - p->p_xstat = rv; + /* begin vproc_exit */ - vproc_exit(p); -} + proc_t q; + proc_t pp; -void -vproc_exit(struct proc *p) -{ - register struct proc *q, *nq, *pp; -#ifdef FIXME - struct task *task = p->task; -#endif + vnode_t tvp; + + struct pgrp * pg; + struct session *sessp; + struct rusage_superset *rup; + + rup = zalloc(zombie_zone); - /* 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. @@ -1134,125 +2535,163 @@ vproc_exit(struct proc *p) */ fdfree(p); - if (SESS_LEADER(p)) { - register struct session *sp = p->p_session; + sessp = proc_session(p); + if (SESS_LEADER(p, sessp)) { + panic("vfork child is session leader"); + } + session_rele(sessp); - if (sp->s_ttyvp) { - struct vnode *ttyvp; - struct vfs_context context; + pg = proc_pgrp(p); + fixjobc(p, pg, 0); + pg_rele(pg); - /* - * Controlling process. - * Signal foreground pgrp, - * 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); - /* - * The tty could have been revoked - * if we blocked. - */ - context.vc_proc = p; - context.vc_ucred = kauth_cred_proc_ref(p); - if (sp->s_ttyvp) - VNOP_REVOKE(sp->s_ttyvp, REVOKEALL, &context); - kauth_cred_unref(&context.vc_ucred); + /* + * Change RLIMIT_FSIZE for accounting/debugging. proc_limitsetcur_internal() will COW the current plimit + * before making changes if the current plimit is shared. The COW'ed plimit will be freed + * below by calling proc_limitdrop(). + */ + proc_limitsetcur_internal(p, RLIMIT_FSIZE, RLIM_INFINITY); + + proc_list_lock(); + + proc_childdrainstart(p); + while ((q = p->p_children.lh_first) != NULL) { + if (q->p_stat == SZOMB) { + if (p != q->p_pptr) { + panic("parent child linkage broken"); } - ttyvp = sp->s_ttyvp; - sp->s_ttyvp = NULL; - if (ttyvp) { - vnode_rele(ttyvp); + /* 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, 0, 1, 0); + } else { /* - * s_ttyp is not zero'd; we use this to indicate - * that the session once had a controlling terminal. - * (for logging and informational purposes) + * Traced processes are killed + * since their existence means someone is messing up. */ + if (q->p_lflag & P_LTRACED) { + struct proc *opp; + + proc_list_unlock(); + + opp = proc_find(q->p_oppid); + if (opp != PROC_NULL) { + proc_list_lock(); + q->p_oppid = 0; + proc_list_unlock(); + proc_reparentlocked(q, opp, 0, 0); + proc_rele(opp); + } else { + /* original parent exited while traced */ + proc_list_lock(); + q->p_listflag |= P_LIST_DEADPARENT; + q->p_oppid = 0; + proc_list_unlock(); + proc_reparentlocked(q, initproc, 0, 0); + } + + proc_lock(q); + q->p_lflag &= ~P_LTRACED; + + if (q->sigwait_thread) { + thread_t thread = 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); + clear_wait(thread, THREAD_INTERRUPTED); + threadsignal(thread, SIGKILL, 0, TRUE); + } else { + proc_unlock(q); + } + + psignal(q, SIGKILL); + proc_list_lock(); + } else { + q->p_listflag |= P_LIST_DEADPARENT; + proc_reparentlocked(q, initproc, 0, 1); + } } - sp->s_leader = NULL; } - fixjobc(p, p->p_pgrp, 0); - p->p_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; + proc_childdrainend(p); + proc_list_unlock(); -#if KTRACE - /* - * release trace file + /* + * Release reference to text vnode */ - p->p_traceflag = 0; /* don't trace the vnode_rele() */ - if (p->p_tracep) { - struct vnode *tvp = p->p_tracep; - p->p_tracep = NULL; + tvp = p->p_textvp; + p->p_textvp = NULL; + if (tvp != NULLVP) { vnode_rele(tvp); } -#endif - - while (q = p->p_children.lh_first) { - 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) { - /* - * 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); - } - psignal(q, SIGKILL); - } - } /* * Save exit status and final rusage info, adding in child rusage * info and self times. If we were unable to allocate a zombie * structure, this information is lost. */ - 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); + if (rup != NULL) { + rup->ru = p->p_stats->p_ru; + timerclear(&rup->ru.ru_utime); + timerclear(&rup->ru.ru_stime); #ifdef FIXME - if (task) { - task_basic_info_data_t tinfo; - task_thread_times_info_data_t ttimesinfo; - int task_info_stuff, task_ttimes_stuff; - struct timeval ut,st; - - task_info_stuff = TASK_BASIC_INFO_COUNT; - task_info(task, TASK_BASIC_INFO, - &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; - - task_ttimes_stuff = TASK_THREAD_TIMES_INFO_COUNT; - task_info(task, TASK_THREAD_TIMES_INFO, - &ttimesinfo, &task_ttimes_stuff); - - ut.tv_sec = ttimesinfo.user_time.seconds; - ut.tv_usec = ttimesinfo.user_time.microseconds; - 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); - } + if (task) { + mach_task_basic_info_data_t tinfo; + task_thread_times_info_data_t ttimesinfo; + int task_info_stuff, task_ttimes_stuff; + struct timeval ut, st; + + task_info_stuff = MACH_TASK_BASIC_INFO_COUNT; + task_info(task, MACH_TASK_BASIC_INFO, + &tinfo, &task_info_stuff); + p->p_ru->ru.ru_utime.tv_sec = tinfo.user_time.seconds; + p->p_ru->ru.ru_utime.tv_usec = tinfo.user_time.microseconds; + p->p_ru->ru.ru_stime.tv_sec = tinfo.system_time.seconds; + p->p_ru->ru.ru_stime.tv_usec = tinfo.system_time.microseconds; + + task_ttimes_stuff = TASK_THREAD_TIMES_INFO_COUNT; + task_info(task, TASK_THREAD_TIMES_INFO, + &ttimesinfo, &task_ttimes_stuff); + + ut.tv_sec = ttimesinfo.user_time.seconds; + ut.tv_usec = ttimesinfo.user_time.microseconds; + st.tv_sec = ttimesinfo.system_time.seconds; + st.tv_usec = ttimesinfo.system_time.microseconds; + timeradd(&ut, &p->p_ru->ru.ru_utime, &p->p_ru->ru.ru_utime); + timeradd(&st, &p->p_ru->ru.ru_stime, &p->p_ru->ru.ru_stime); + } #endif /* FIXME */ - ruadd(p->p_ru, &p->p_stats->p_cru); + ruadd(&rup->ru, &p->p_stats->p_cru); + + gather_rusage_info(p, &rup->ri, RUSAGE_INFO_CURRENT); + rup->ri.ri_phys_footprint = 0; + rup->ri.ri_proc_exit_abstime = mach_absolute_time(); + + /* + * Now that we have filled in the rusage info, make it + * visible to an external observer via proc_pid_rusage(). + */ + p->p_ru = rup; } /* @@ -1271,18 +2710,25 @@ vproc_exit(struct proc *p) } } +#if PSYNCH + pth_proc_hashdelete(p); +#endif /* PSYNCH */ + + proc_free_realitimer(p); + /* * Other substructures are freed from wait(). */ - FREE_ZONE(p->p_stats, sizeof *p->p_stats, M_SUBPROC); + zfree(proc_stats_zone, p->p_stats); p->p_stats = NULL; - FREE_ZONE(p->p_sigacts, sizeof *p->p_sigacts, M_SUBPROC); + zfree(proc_sigacts_zone, p->p_sigacts); p->p_sigacts = NULL; - if (--p->p_limit->p_refcnt == 0) - FREE_ZONE(p->p_limit, sizeof *p->p_limit, M_SUBPROC); - p->p_limit = NULL; + FREE(p->p_subsystem_root_path, M_SBUF); + p->p_subsystem_root_path = NULL; + + proc_limitdrop(p); /* * Finish up by terminating the task @@ -1294,32 +2740,74 @@ 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_ucred->cr_ruid; - } - /* mark as a zombie */ - p->p_stat = SZOMB; + 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->p_xhighbits = p->p_xhighbits; + p->p_xhighbits = 0; + 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 = kauth_cred_getruid(p->p_ucred); + 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(p->p_pptr, SIGCHLD); + psignal(pp, SIGCHLD); - /* and now wakeup the parent */ - wakeup((caddr_t)p->p_pptr); + /* and now wakeup the parent */ + proc_list_lock(); + wakeup((caddr_t)pp); + proc_list_unlock(); + } else { + proc_list_lock(); + /* 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_stat = SZOMB; + 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, 0, 1, 1); + /* list lock dropped by reap_child_locked */ + } + proc_rele(pp); } - + /* * 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 + * process. We munge the kernel 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) +__private_extern__ void +munge_user64_rusage(struct rusage *a_rusage_p, struct user64_rusage *a_user_rusage_p) { + /* Zero-out struct so that padding is cleared */ + bzero(a_user_rusage_p, sizeof(struct user64_rusage)); + /* 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; @@ -1344,3 +2832,70 @@ munge_rusage(struct rusage *a_rusage_p, struct user_rusage *a_user_rusage_p) a_user_rusage_p->ru_nvcsw = a_rusage_p->ru_nvcsw; a_user_rusage_p->ru_nivcsw = a_rusage_p->ru_nivcsw; } + +/* For a 64-bit kernel and 32-bit userspace, munging may be needed */ +__private_extern__ void +munge_user32_rusage(struct rusage *a_rusage_p, struct user32_rusage *a_user_rusage_p) +{ + bzero(a_user_rusage_p, sizeof(struct user32_rusage)); + + /* timeval changes size, so utime and stime need special handling */ + a_user_rusage_p->ru_utime.tv_sec = (user32_time_t)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 = (user32_time_t)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. We currently ignore + * the loss of precision + */ + a_user_rusage_p->ru_maxrss = (user32_long_t)a_rusage_p->ru_maxrss; + a_user_rusage_p->ru_ixrss = (user32_long_t)a_rusage_p->ru_ixrss; + a_user_rusage_p->ru_idrss = (user32_long_t)a_rusage_p->ru_idrss; + a_user_rusage_p->ru_isrss = (user32_long_t)a_rusage_p->ru_isrss; + a_user_rusage_p->ru_minflt = (user32_long_t)a_rusage_p->ru_minflt; + a_user_rusage_p->ru_majflt = (user32_long_t)a_rusage_p->ru_majflt; + a_user_rusage_p->ru_nswap = (user32_long_t)a_rusage_p->ru_nswap; + a_user_rusage_p->ru_inblock = (user32_long_t)a_rusage_p->ru_inblock; + a_user_rusage_p->ru_oublock = (user32_long_t)a_rusage_p->ru_oublock; + a_user_rusage_p->ru_msgsnd = (user32_long_t)a_rusage_p->ru_msgsnd; + a_user_rusage_p->ru_msgrcv = (user32_long_t)a_rusage_p->ru_msgrcv; + a_user_rusage_p->ru_nsignals = (user32_long_t)a_rusage_p->ru_nsignals; + a_user_rusage_p->ru_nvcsw = (user32_long_t)a_rusage_p->ru_nvcsw; + a_user_rusage_p->ru_nivcsw = (user32_long_t)a_rusage_p->ru_nivcsw; +} + +void +kdp_wait4_find_process(thread_t thread, __unused event64_t wait_event, thread_waitinfo_t *waitinfo) +{ + assert(thread != NULL); + assert(waitinfo != NULL); + + struct uthread *ut = get_bsdthread_info(thread); + waitinfo->context = 0; + // ensure wmesg is consistent with a thread waiting in wait4 + assert(!strcmp(ut->uu_wmesg, "waitcoll") || !strcmp(ut->uu_wmesg, "wait")); + struct wait4_nocancel_args *args = ut->uu_save.uus_wait4_data.args; + // May not actually contain a pid; this is just the argument to wait4. + // See man wait4 for other valid wait4 arguments. + waitinfo->owner = args->pid; +} + +#if __has_feature(ptrauth_calls) +int +exit_with_pac_exception(proc_t p, exception_type_t exception, mach_exception_code_t code, + mach_exception_subcode_t subcode) +{ + thread_t self = current_thread(); + struct uthread *ut = get_bsdthread_info(self); + + os_reason_t exception_reason = os_reason_create(OS_REASON_PAC_EXCEPTION, (uint64_t)code); + assert(exception_reason != OS_REASON_NULL); + exception_reason->osr_flags |= OS_REASON_FLAG_GENERATE_CRASH_REPORT; + ut->uu_exception = exception; + ut->uu_code = code; + ut->uu_subcode = subcode; + + return exit_with_reason(p, W_EXITCODE(0, SIGKILL), (int *)NULL, TRUE, FALSE, + 0, exception_reason); +} +#endif /* __has_feature(ptrauth_calls) */