X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/d7e50217d7adf6e52786a38bcaa4cd698cb9a79e..94ff46dc2849db4d43eaaf144872decc522aafb4:/osfmk/kern/ipc_tt.c diff --git a/osfmk/kern/ipc_tt.c b/osfmk/kern/ipc_tt.c index 2cb2d6ef1..8af9d9cb2 100644 --- a/osfmk/kern/ipc_tt.c +++ b/osfmk/kern/ipc_tt.c @@ -1,17 +1,20 @@ /* - * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2010 Apple Inc. All rights reserved. + * + * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * - * @APPLE_LICENSE_HEADER_START@ - * - * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. - * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in - * compliance with the License. Please obtain a copy of the License at - * http://www.opensource.apple.com/apsl/ and read it before using this - * file. - * + * compliance with the License. The rights granted to you under the License + * may not be used to create, or enable the creation or redistribution of, + * unlawful or unlicensed copies of an Apple operating system, or to + * circumvent, violate, or enable the circumvention or violation of, any + * terms of an Apple operating system software license agreement. + * + * Please obtain a copy of the License at + * http://www.opensource.apple.com/apsl/ and read it before using this file. + * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, @@ -19,37 +22,43 @@ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. - * - * @APPLE_LICENSE_HEADER_END@ + * + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * @OSF_COPYRIGHT@ */ -/* +/* * Mach Operating System * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University * All Rights Reserved. - * + * * Permission to use, copy, modify and distribute this software and its * documentation is hereby granted, provided that both the copyright * notice and this permission notice appear in all copies of the * software, derivative works or modified versions, and any portions * thereof, and that both notices appear in supporting documentation. - * + * * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. - * + * * Carnegie Mellon requests users of this software to return to - * + * * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU * School of Computer Science * Carnegie Mellon University * Pittsburgh PA 15213-3890 - * + * * any improvements or extensions that they make and grant Carnegie Mellon * the rights to redistribute these changes. */ +/* + * NOTICE: This file was modified by McAfee Research in 2004 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. + */ /* */ @@ -61,23 +70,44 @@ #include #include -#include #include #include #include #include #include #include +#include #include #include #include #include +#include #include + +#include #include +#include #include -#include +#include +#include #include + +#include #include +#include + +#include + +#if CONFIG_EMBEDDED && !SECURE_KERNEL +extern int cs_relax_platform_task_ports; +#endif + +/* forward declarations */ +task_t convert_port_to_locked_task(ipc_port_t port); +task_inspect_t convert_port_to_locked_task_inspect(ipc_port_t port); +static void ipc_port_bind_special_reply_port_locked(ipc_port_t port); +static kern_return_t ipc_port_unbind_special_reply_port(thread_t thread, boolean_t unbind_active_port); +kern_return_t task_conversion_eval(task_t caller, task_t victim); /* * Routine: ipc_task_init @@ -92,63 +122,120 @@ void ipc_task_init( - task_t task, - task_t parent) + task_t task, + task_t parent) { ipc_space_t space; ipc_port_t kport; + ipc_port_t nport; kern_return_t kr; int i; kr = ipc_space_create(&ipc_table_entries[0], &space); - if (kr != KERN_SUCCESS) + if (kr != KERN_SUCCESS) { panic("ipc_task_init"); + } + space->is_task = task; kport = ipc_port_alloc_kernel(); - if (kport == IP_NULL) + if (kport == IP_NULL) { + panic("ipc_task_init"); + } + + nport = ipc_port_alloc_kernel(); + if (nport == IP_NULL) { panic("ipc_task_init"); + } itk_lock_init(task); task->itk_self = kport; - task->itk_sself = ipc_port_make_send(kport); + task->itk_nself = nport; + task->itk_resume = IP_NULL; /* Lazily allocated on-demand */ + if (task_is_a_corpse_fork(task)) { + /* + * No sender's notification for corpse would not + * work with a naked send right in kernel. + */ + task->itk_sself = IP_NULL; + } else { + task->itk_sself = ipc_port_make_send(kport); + } + task->itk_debug_control = IP_NULL; task->itk_space = space; - space->is_fast = task->kernel_loaded; + +#if CONFIG_MACF + task->exc_actions[0].label = NULL; + for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; i++) { + mac_exc_associate_action_label(&task->exc_actions[i], mac_exc_create_label()); + } +#endif + + /* always zero-out the first (unused) array element */ + bzero(&task->exc_actions[0], sizeof(task->exc_actions[0])); if (parent == TASK_NULL) { + ipc_port_t port; for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; i++) { task->exc_actions[i].port = IP_NULL; + task->exc_actions[i].flavor = 0; + task->exc_actions[i].behavior = 0; + task->exc_actions[i].privileged = FALSE; }/* for */ - task->itk_host = ipc_port_make_send(realhost.host_self); + + kr = host_get_host_port(host_priv_self(), &port); + assert(kr == KERN_SUCCESS); + task->itk_host = port; + task->itk_bootstrap = IP_NULL; - for (i = 0; i < TASK_PORT_REGISTER_MAX; i++) + task->itk_seatbelt = IP_NULL; + task->itk_gssd = IP_NULL; + task->itk_task_access = IP_NULL; + + for (i = 0; i < TASK_PORT_REGISTER_MAX; i++) { task->itk_registered[i] = IP_NULL; + } } else { itk_lock(parent); assert(parent->itk_self != IP_NULL); /* inherit registered ports */ - for (i = 0; i < TASK_PORT_REGISTER_MAX; i++) + for (i = 0; i < TASK_PORT_REGISTER_MAX; i++) { task->itk_registered[i] = - ipc_port_copy_send(parent->itk_registered[i]); + ipc_port_copy_send(parent->itk_registered[i]); + } /* inherit exception and bootstrap ports */ for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; i++) { - task->exc_actions[i].port = - ipc_port_copy_send(parent->exc_actions[i].port); - task->exc_actions[i].flavor = - parent->exc_actions[i].flavor; - task->exc_actions[i].behavior = - parent->exc_actions[i].behavior; + task->exc_actions[i].port = + ipc_port_copy_send(parent->exc_actions[i].port); + task->exc_actions[i].flavor = + parent->exc_actions[i].flavor; + task->exc_actions[i].behavior = + parent->exc_actions[i].behavior; + task->exc_actions[i].privileged = + parent->exc_actions[i].privileged; +#if CONFIG_MACF + mac_exc_inherit_action_label(parent->exc_actions + i, task->exc_actions + i); +#endif }/* for */ task->itk_host = - ipc_port_copy_send(parent->itk_host); + ipc_port_copy_send(parent->itk_host); task->itk_bootstrap = - ipc_port_copy_send(parent->itk_bootstrap); + ipc_port_copy_send(parent->itk_bootstrap); + + task->itk_seatbelt = + ipc_port_copy_send(parent->itk_seatbelt); + + task->itk_gssd = + ipc_port_copy_send(parent->itk_gssd); + + task->itk_task_access = + ipc_port_copy_send(parent->itk_task_access); itk_unlock(parent); } @@ -164,14 +251,20 @@ ipc_task_init( void ipc_task_enable( - task_t task) + task_t task) { ipc_port_t kport; + ipc_port_t nport; itk_lock(task); kport = task->itk_self; - if (kport != IP_NULL) + if (kport != IP_NULL) { ipc_kobject_set(kport, (ipc_kobject_t) task, IKOT_TASK); + } + nport = task->itk_nself; + if (nport != IP_NULL) { + ipc_kobject_set(nport, (ipc_kobject_t) task, IKOT_TASK_NAME); + } itk_unlock(task); } @@ -185,14 +278,38 @@ ipc_task_enable( void ipc_task_disable( - task_t task) + task_t task) { ipc_port_t kport; + ipc_port_t nport; + ipc_port_t rport; itk_lock(task); kport = task->itk_self; - if (kport != IP_NULL) + if (kport != IP_NULL) { ipc_kobject_set(kport, IKO_NULL, IKOT_NONE); + } + nport = task->itk_nself; + if (nport != IP_NULL) { + ipc_kobject_set(nport, IKO_NULL, IKOT_NONE); + } + + rport = task->itk_resume; + if (rport != IP_NULL) { + /* + * From this point onwards this task is no longer accepting + * resumptions. + * + * There are still outstanding suspensions on this task, + * even as it is being torn down. Disconnect the task + * from the rport, thereby "orphaning" the rport. The rport + * itself will go away only when the last suspension holder + * destroys his SO right to it -- when he either + * exits, or tries to actually use that last SO right to + * resume this (now non-existent) task. + */ + ipc_kobject_set(rport, IKO_NULL, IKOT_NONE); + } itk_unlock(task); } @@ -207,9 +324,11 @@ ipc_task_disable( void ipc_task_terminate( - task_t task) + task_t task) { ipc_port_t kport; + ipc_port_t nport; + ipc_port_t rport; int i; itk_lock(task); @@ -220,35 +339,166 @@ ipc_task_terminate( itk_unlock(task); return; } - task->itk_self = IP_NULL; + + nport = task->itk_nself; + assert(nport != IP_NULL); + task->itk_nself = IP_NULL; + + rport = task->itk_resume; + task->itk_resume = IP_NULL; + itk_unlock(task); /* release the naked send rights */ - if (IP_VALID(task->itk_sself)) + if (IP_VALID(task->itk_sself)) { ipc_port_release_send(task->itk_sself); + } for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; i++) { if (IP_VALID(task->exc_actions[i].port)) { ipc_port_release_send(task->exc_actions[i].port); } - }/* for */ - if (IP_VALID(task->itk_host)) +#if CONFIG_MACF + mac_exc_free_action_label(task->exc_actions + i); +#endif + } + + if (IP_VALID(task->itk_host)) { ipc_port_release_send(task->itk_host); + } - if (IP_VALID(task->itk_bootstrap)) + if (IP_VALID(task->itk_bootstrap)) { ipc_port_release_send(task->itk_bootstrap); + } + + if (IP_VALID(task->itk_seatbelt)) { + ipc_port_release_send(task->itk_seatbelt); + } + + if (IP_VALID(task->itk_gssd)) { + ipc_port_release_send(task->itk_gssd); + } + + if (IP_VALID(task->itk_task_access)) { + ipc_port_release_send(task->itk_task_access); + } - for (i = 0; i < TASK_PORT_REGISTER_MAX; i++) - if (IP_VALID(task->itk_registered[i])) + if (IP_VALID(task->itk_debug_control)) { + ipc_port_release_send(task->itk_debug_control); + } + + for (i = 0; i < TASK_PORT_REGISTER_MAX; i++) { + if (IP_VALID(task->itk_registered[i])) { ipc_port_release_send(task->itk_registered[i]); + } + } + + /* destroy the kernel ports */ + ipc_port_dealloc_kernel(kport); + ipc_port_dealloc_kernel(nport); + if (rport != IP_NULL) { + ipc_port_dealloc_kernel(rport); + } + + itk_lock_destroy(task); +} + +/* + * Routine: ipc_task_reset + * Purpose: + * Reset a task's IPC state to protect it when + * it enters an elevated security context. The + * task name port can remain the same - since + * it represents no specific privilege. + * Conditions: + * Nothing locked. The task must be suspended. + * (Or the current thread must be in the task.) + */ + +void +ipc_task_reset( + task_t task) +{ + ipc_port_t old_kport, new_kport; + ipc_port_t old_sself; + ipc_port_t old_exc_actions[EXC_TYPES_COUNT]; + int i; + +#if CONFIG_MACF + /* Fresh label to unset credentials in existing labels. */ + struct label *unset_label = mac_exc_create_label(); +#endif + + new_kport = ipc_kobject_alloc_port((ipc_kobject_t)task, IKOT_TASK, + IPC_KOBJECT_ALLOC_MAKE_SEND); + + itk_lock(task); + + old_kport = task->itk_self; + + if (old_kport == IP_NULL) { + /* the task is already terminated (can this happen?) */ + itk_unlock(task); + ipc_port_release_send(new_kport); + ipc_port_dealloc_kernel(new_kport); +#if CONFIG_MACF + mac_exc_free_label(unset_label); +#endif + return; + } + + old_sself = task->itk_sself; + task->itk_sself = task->itk_self = new_kport; - ipc_port_release_send(task->wired_ledger_port); - ipc_port_release_send(task->paged_ledger_port); + /* Set the old kport to IKOT_NONE and update the exec token while under the port lock */ + ip_lock(old_kport); + ipc_kobject_set_atomically(old_kport, IKO_NULL, IKOT_NONE); + task->exec_token += 1; + ip_unlock(old_kport); + + for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; i++) { + old_exc_actions[i] = IP_NULL; + + if (i == EXC_CORPSE_NOTIFY && task_corpse_pending_report(task)) { + continue; + } + + if (!task->exc_actions[i].privileged) { +#if CONFIG_MACF + mac_exc_update_action_label(task->exc_actions + i, unset_label); +#endif + old_exc_actions[i] = task->exc_actions[i].port; + task->exc_actions[i].port = IP_NULL; + } + }/* for */ + + if (IP_VALID(task->itk_debug_control)) { + ipc_port_release_send(task->itk_debug_control); + } + task->itk_debug_control = IP_NULL; + + itk_unlock(task); + +#if CONFIG_MACF + mac_exc_free_label(unset_label); +#endif + + /* release the naked send rights */ + + if (IP_VALID(old_sself)) { + ipc_port_release_send(old_sself); + } + + for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; i++) { + if (IP_VALID(old_exc_actions[i])) { + ipc_port_release_send(old_exc_actions[i]); + } + }/* for */ /* destroy the kernel port */ - ipc_port_dealloc_kernel(kport); + ipc_port_dealloc_kernel(old_kport); } /* @@ -261,96 +511,219 @@ ipc_task_terminate( void ipc_thread_init( - thread_t thread) + thread_t thread) { + ipc_port_t kport; + + kport = ipc_kobject_alloc_port((ipc_kobject_t)thread, IKOT_THREAD, + IPC_KOBJECT_ALLOC_MAKE_SEND); + + thread->ith_sself = thread->ith_self = kport; + thread->ith_special_reply_port = NULL; + thread->exc_actions = NULL; + +#if IMPORTANCE_INHERITANCE + thread->ith_assertions = 0; +#endif + ipc_kmsg_queue_init(&thread->ith_messages); - thread->ith_mig_reply = MACH_PORT_NULL; + thread->ith_rpc_reply = IP_NULL; } -/* - * Routine: ipc_thread_terminate - * Purpose: - * Clean up and destroy a thread's IPC state. - * Conditions: - * Nothing locked. The thread must be suspended. - * (Or be the current thread.) - */ +void +ipc_thread_init_exc_actions( + thread_t thread) +{ + assert(thread->exc_actions == NULL); + + thread->exc_actions = kalloc(sizeof(struct exception_action) * EXC_TYPES_COUNT); + bzero(thread->exc_actions, sizeof(struct exception_action) * EXC_TYPES_COUNT); + +#if CONFIG_MACF + for (size_t i = 0; i < EXC_TYPES_COUNT; ++i) { + mac_exc_associate_action_label(thread->exc_actions + i, mac_exc_create_label()); + } +#endif +} void -ipc_thread_terminate( - thread_t thread) +ipc_thread_destroy_exc_actions( + thread_t thread) { - assert(ipc_kmsg_queue_empty(&thread->ith_messages)); + if (thread->exc_actions != NULL) { +#if CONFIG_MACF + for (size_t i = 0; i < EXC_TYPES_COUNT; ++i) { + mac_exc_free_action_label(thread->exc_actions + i); + } +#endif - if (thread->ith_rpc_reply != IP_NULL) - ipc_port_dealloc_reply(thread->ith_rpc_reply); - thread->ith_rpc_reply = IP_NULL; + kfree(thread->exc_actions, + sizeof(struct exception_action) * EXC_TYPES_COUNT); + thread->exc_actions = NULL; + } +} + +void +ipc_thread_disable( + thread_t thread) +{ + ipc_port_t kport = thread->ith_self; + + if (kport != IP_NULL) { + ipc_kobject_set(kport, IKO_NULL, IKOT_NONE); + } + + /* unbind the thread special reply port */ + if (IP_VALID(thread->ith_special_reply_port)) { + ipc_port_unbind_special_reply_port(thread, TRUE); + } } /* - * Routine: ipc_thr_act_init + * Routine: ipc_thread_terminate * Purpose: - * Initialize an thr_act's IPC state. + * Clean up and destroy a thread's IPC state. * Conditions: * Nothing locked. */ void -ipc_thr_act_init(task_t task, thread_act_t thr_act) +ipc_thread_terminate( + thread_t thread) { - ipc_port_t kport; int i; + ipc_port_t kport = thread->ith_self; - kport = ipc_port_alloc_kernel(); - if (kport == IP_NULL) - panic("ipc_thr_act_init"); + if (kport != IP_NULL) { + int i; - thr_act->ith_self = kport; - thr_act->ith_sself = ipc_port_make_send(kport); + if (IP_VALID(thread->ith_sself)) { + ipc_port_release_send(thread->ith_sself); + } - for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; i++) - thr_act->exc_actions[i].port = IP_NULL; + thread->ith_sself = thread->ith_self = IP_NULL; - ipc_kobject_set(kport, (ipc_kobject_t) thr_act, IKOT_ACT); -} + if (thread->exc_actions != NULL) { + for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; ++i) { + if (IP_VALID(thread->exc_actions[i].port)) { + ipc_port_release_send(thread->exc_actions[i].port); + } + } + ipc_thread_destroy_exc_actions(thread); + } -void -ipc_thr_act_disable(thread_act_t thr_act) -{ - int i; - ipc_port_t kport; + ipc_port_dealloc_kernel(kport); + } - kport = thr_act->ith_self; +#if IMPORTANCE_INHERITANCE + assert(thread->ith_assertions == 0); +#endif - if (kport != IP_NULL) - ipc_kobject_set(kport, IKO_NULL, IKOT_NONE); + assert(ipc_kmsg_queue_empty(&thread->ith_messages)); + + if (thread->ith_rpc_reply != IP_NULL) { + ipc_port_dealloc_reply(thread->ith_rpc_reply); + } + + thread->ith_rpc_reply = IP_NULL; } +/* + * Routine: ipc_thread_reset + * Purpose: + * Reset the IPC state for a given Mach thread when + * its task enters an elevated security context. + * Both the thread port and its exception ports have + * to be reset. Its RPC reply port cannot have any + * rights outstanding, so it should be fine. + * Conditions: + * Nothing locked. + */ + void -ipc_thr_act_terminate(thread_act_t thr_act) +ipc_thread_reset( + thread_t thread) { - ipc_port_t kport; int i; + ipc_port_t old_kport, new_kport; + ipc_port_t old_sself; + ipc_port_t old_exc_actions[EXC_TYPES_COUNT]; + boolean_t has_old_exc_actions = FALSE; + int i; + +#if CONFIG_MACF + struct label *new_label = mac_exc_create_label(); +#endif + + new_kport = ipc_kobject_alloc_port((ipc_kobject_t)thread, IKOT_THREAD, + IPC_KOBJECT_ALLOC_MAKE_SEND); + + thread_mtx_lock(thread); + + old_kport = thread->ith_self; + old_sself = thread->ith_sself; + + if (old_kport == IP_NULL && thread->inspection == FALSE) { + /* the is already terminated (can this happen?) */ + thread_mtx_unlock(thread); + ipc_port_release_send(new_kport); + ipc_port_dealloc_kernel(new_kport); +#if CONFIG_MACF + mac_exc_free_label(new_label); +#endif + return; + } - kport = thr_act->ith_self; + thread->ith_sself = thread->ith_self = new_kport; + if (old_kport != IP_NULL) { + ipc_kobject_set(old_kport, IKO_NULL, IKOT_NONE); + } - if (kport == IP_NULL) { - /* the thread is already terminated (can this happen?) */ - return; + /* + * Only ports that were set by root-owned processes + * (privileged ports) should survive + */ + if (thread->exc_actions != NULL) { + has_old_exc_actions = TRUE; + for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; i++) { + if (thread->exc_actions[i].privileged) { + old_exc_actions[i] = IP_NULL; + } else { +#if CONFIG_MACF + mac_exc_update_action_label(thread->exc_actions + i, new_label); +#endif + old_exc_actions[i] = thread->exc_actions[i].port; + thread->exc_actions[i].port = IP_NULL; + } + } } - thr_act->ith_self = IP_NULL; + thread_mtx_unlock(thread); + +#if CONFIG_MACF + mac_exc_free_label(new_label); +#endif /* release the naked send rights */ - if (IP_VALID(thr_act->ith_sself)) - ipc_port_release_send(thr_act->ith_sself); - for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; i++) { - if (IP_VALID(thr_act->exc_actions[i].port)) - ipc_port_release_send(thr_act->exc_actions[i].port); - } + if (IP_VALID(old_sself)) { + ipc_port_release_send(old_sself); + } + + if (has_old_exc_actions) { + for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; i++) { + ipc_port_release_send(old_exc_actions[i]); + } + } /* destroy the kernel port */ - ipc_port_dealloc_kernel(kport); + if (old_kport != IP_NULL) { + ipc_port_dealloc_kernel(old_kport); + } + + /* unbind the thread special reply port */ + if (IP_VALID(thread->ith_special_reply_port)) { + ipc_port_unbind_special_reply_port(thread, TRUE); + } } /* @@ -367,9 +740,10 @@ ipc_thr_act_terminate(thread_act_t thr_act) ipc_port_t retrieve_task_self_fast( - register task_t task) + task_t task) { - register ipc_port_t port; + __assert_only ipc_port_t sright; + ipc_port_t port; assert(task == current_task()); @@ -378,51 +752,50 @@ retrieve_task_self_fast( if ((port = task->itk_sself) == task->itk_self) { /* no interposing */ - - ip_lock(port); - assert(ip_active(port)); - ip_reference(port); - port->ip_srights++; - ip_unlock(port); - } else + sright = ipc_port_copy_send(port); + assert(sright == port); + } else { port = ipc_port_copy_send(port); + } itk_unlock(task); return port; } /* - * Routine: retrieve_act_self_fast + * Routine: retrieve_thread_self_fast * Purpose: - * Optimized version of retrieve_thread_self, - * that only works for the current thread. - * * Return a send right (possibly null/dead) * for the thread's user-visible self port. + * + * Only works for the current thread. + * * Conditions: * Nothing locked. */ ipc_port_t -retrieve_act_self_fast(thread_act_t thr_act) +retrieve_thread_self_fast( + thread_t thread) { - register ipc_port_t port; + __assert_only ipc_port_t sright; + ipc_port_t port; - assert(thr_act == current_act()); - act_lock(thr_act); - assert(thr_act->ith_self != IP_NULL); + assert(thread == current_thread()); - if ((port = thr_act->ith_sself) == thr_act->ith_self) { - /* no interposing */ + thread_mtx_lock(thread); - ip_lock(port); - assert(ip_active(port)); - ip_reference(port); - port->ip_srights++; - ip_unlock(port); - } else + assert(thread->ith_self != IP_NULL); + + if ((port = thread->ith_sself) == thread->ith_self) { + /* no interposing */ + sright = ipc_port_copy_send(port); + assert(sright == port); + } else { port = ipc_port_copy_send(port); - act_unlock(thr_act); + } + + thread_mtx_unlock(thread); return port; } @@ -439,13 +812,16 @@ retrieve_act_self_fast(thread_act_t thr_act) */ mach_port_name_t -task_self_trap(void) +task_self_trap( + __unused struct task_self_trap_args *args) { task_t task = current_task(); ipc_port_t sright; + mach_port_name_t name; sright = retrieve_task_self_fast(task); - return ipc_port_copyout_send(sright, task->itk_space); + name = ipc_port_copyout_send(sright, task->itk_space); + return name; } /* @@ -460,14 +836,17 @@ task_self_trap(void) */ mach_port_name_t -thread_self_trap(void) +thread_self_trap( + __unused struct thread_self_trap_args *args) { - thread_act_t thr_act = current_act(); - task_t task = thr_act->task; + thread_t thread = current_thread(); + task_t task = thread->task; ipc_port_t sright; + mach_port_name_t name; - sright = retrieve_act_self_fast(thr_act); - return ipc_port_copyout_send(sright, task->itk_space); + sright = retrieve_thread_self_fast(thread); + name = ipc_port_copyout_send(sright, task->itk_space); + return name; } /* @@ -482,69 +861,252 @@ thread_self_trap(void) */ mach_port_name_t -mach_reply_port(void) +mach_reply_port( + __unused struct mach_reply_port_args *args) { ipc_port_t port; mach_port_name_t name; kern_return_t kr; - kr = ipc_port_alloc(current_task()->itk_space, &name, &port); - if (kr == KERN_SUCCESS) + kr = ipc_port_alloc(current_task()->itk_space, IPC_PORT_INIT_MESSAGE_QUEUE, + &name, &port); + if (kr == KERN_SUCCESS) { ip_unlock(port); - else + } else { name = MACH_PORT_NULL; - + } return name; } /* - * Routine: task_get_special_port [kernel call] + * Routine: thread_get_special_reply_port [mach trap] * Purpose: - * Clones a send right for one of the task's - * special ports. + * Allocate a special reply port for the calling thread. * Conditions: * Nothing locked. * Returns: - * KERN_SUCCESS Extracted a send right. - * KERN_INVALID_ARGUMENT The task is null. - * KERN_FAILURE The task/space is dead. - * KERN_INVALID_ARGUMENT Invalid special port. + * mach_port_name_t: send right & receive right for special reply port. + * MACH_PORT_NULL if there are any resource failures + * or other errors. */ -kern_return_t -task_get_special_port( - task_t task, - int which, - ipc_port_t *portp) +mach_port_name_t +thread_get_special_reply_port( + __unused struct thread_get_special_reply_port_args *args) { - ipc_port_t *whichp; ipc_port_t port; + mach_port_name_t name; + kern_return_t kr; + thread_t thread = current_thread(); + ipc_port_init_flags_t flags = IPC_PORT_INIT_MESSAGE_QUEUE | + IPC_PORT_INIT_MAKE_SEND_RIGHT | IPC_PORT_INIT_SPECIAL_REPLY; + + /* unbind the thread special reply port */ + if (IP_VALID(thread->ith_special_reply_port)) { + kr = ipc_port_unbind_special_reply_port(thread, TRUE); + if (kr != KERN_SUCCESS) { + return MACH_PORT_NULL; + } + } - if (task == TASK_NULL) - return KERN_INVALID_ARGUMENT; + kr = ipc_port_alloc(current_task()->itk_space, flags, &name, &port); + if (kr == KERN_SUCCESS) { + ipc_port_bind_special_reply_port_locked(port); + ip_unlock(port); + } else { + name = MACH_PORT_NULL; + } + return name; +} - switch (which) { - case TASK_KERNEL_PORT: - whichp = &task->itk_sself; - break; +/* + * Routine: ipc_port_bind_special_reply_port_locked + * Purpose: + * Bind the given port to current thread as a special reply port. + * Conditions: + * Port locked. + * Returns: + * None. + */ - case TASK_HOST_PORT: - whichp = &task->itk_host; - break; +static void +ipc_port_bind_special_reply_port_locked( + ipc_port_t port) +{ + thread_t thread = current_thread(); + assert(thread->ith_special_reply_port == NULL); + assert(port->ip_specialreply); + assert(port->ip_sync_link_state == PORT_SYNC_LINK_ANY); - case TASK_BOOTSTRAP_PORT: - whichp = &task->itk_bootstrap; + ip_reference(port); + thread->ith_special_reply_port = port; + port->ip_messages.imq_srp_owner_thread = thread; + + ipc_special_reply_port_bits_reset(port); +} + +/* + * Routine: ipc_port_unbind_special_reply_port + * Purpose: + * Unbind the thread's special reply port. + * If the special port has threads waiting on turnstile, + * update it's inheritor. + * Condition: + * Nothing locked. + * Returns: + * None. + */ +static kern_return_t +ipc_port_unbind_special_reply_port( + thread_t thread, + boolean_t unbind_active_port) +{ + ipc_port_t special_reply_port = thread->ith_special_reply_port; + + ip_lock(special_reply_port); + + /* Return error if port active and unbind_active_port set to FALSE */ + if (unbind_active_port == FALSE && ip_active(special_reply_port)) { + ip_unlock(special_reply_port); + return KERN_FAILURE; + } + + thread->ith_special_reply_port = NULL; + ipc_port_adjust_special_reply_port_locked(special_reply_port, NULL, + IPC_PORT_ADJUST_UNLINK_THREAD, FALSE); + /* port unlocked */ + + ip_release(special_reply_port); + return KERN_SUCCESS; +} + +/* + * Routine: thread_get_special_port [kernel call] + * Purpose: + * Clones a send right for one of the thread's + * special ports. + * Conditions: + * Nothing locked. + * Returns: + * KERN_SUCCESS Extracted a send right. + * KERN_INVALID_ARGUMENT The thread is null. + * KERN_FAILURE The thread is dead. + * KERN_INVALID_ARGUMENT Invalid special port. + */ + +kern_return_t +thread_get_special_port( + thread_t thread, + int which, + ipc_port_t *portp) +{ + kern_return_t result = KERN_SUCCESS; + ipc_port_t *whichp; + + if (thread == THREAD_NULL) { + return KERN_INVALID_ARGUMENT; + } + + switch (which) { + case THREAD_KERNEL_PORT: + whichp = &thread->ith_sself; + break; + + default: + return KERN_INVALID_ARGUMENT; + } + + thread_mtx_lock(thread); + + if (thread->active) { + *portp = ipc_port_copy_send(*whichp); + } else { + result = KERN_FAILURE; + } + + thread_mtx_unlock(thread); + + return result; +} + +/* + * Routine: thread_set_special_port [kernel call] + * Purpose: + * Changes one of the thread's special ports, + * setting it to the supplied send right. + * Conditions: + * Nothing locked. If successful, consumes + * the supplied send right. + * Returns: + * KERN_SUCCESS Changed the special port. + * KERN_INVALID_ARGUMENT The thread is null. + * KERN_FAILURE The thread is dead. + * KERN_INVALID_ARGUMENT Invalid special port. + */ + +kern_return_t +thread_set_special_port( + thread_t thread, + int which, + ipc_port_t port) +{ + kern_return_t result = KERN_SUCCESS; + ipc_port_t *whichp, old = IP_NULL; + + if (thread == THREAD_NULL) { + return KERN_INVALID_ARGUMENT; + } + + switch (which) { + case THREAD_KERNEL_PORT: + whichp = &thread->ith_sself; break; - case TASK_WIRED_LEDGER_PORT: - whichp = &task->wired_ledger_port; - break; + default: + return KERN_INVALID_ARGUMENT; + } + + thread_mtx_lock(thread); + + if (thread->active) { + old = *whichp; + *whichp = port; + } else { + result = KERN_FAILURE; + } + + thread_mtx_unlock(thread); + + if (IP_VALID(old)) { + ipc_port_release_send(old); + } + + return result; +} - case TASK_PAGED_LEDGER_PORT: - whichp = &task->paged_ledger_port; - break; - - default: +/* + * Routine: task_get_special_port [kernel call] + * Purpose: + * Clones a send right for one of the task's + * special ports. + * Conditions: + * Nothing locked. + * Returns: + * KERN_SUCCESS Extracted a send right. + * KERN_INVALID_ARGUMENT The task is null. + * KERN_FAILURE The task/space is dead. + * KERN_INVALID_ARGUMENT Invalid special port. + */ + +kern_return_t +task_get_special_port( + task_t task, + int which, + ipc_port_t *portp) +{ + ipc_port_t port; + + if (task == TASK_NULL) { return KERN_INVALID_ARGUMENT; } @@ -554,7 +1116,39 @@ task_get_special_port( return KERN_FAILURE; } - port = ipc_port_copy_send(*whichp); + switch (which) { + case TASK_KERNEL_PORT: + port = ipc_port_copy_send(task->itk_sself); + break; + + case TASK_NAME_PORT: + port = ipc_port_make_send(task->itk_nself); + break; + + case TASK_HOST_PORT: + port = ipc_port_copy_send(task->itk_host); + break; + + case TASK_BOOTSTRAP_PORT: + port = ipc_port_copy_send(task->itk_bootstrap); + break; + + case TASK_SEATBELT_PORT: + port = ipc_port_copy_send(task->itk_seatbelt); + break; + + case TASK_ACCESS_PORT: + port = ipc_port_copy_send(task->itk_task_access); + break; + + case TASK_DEBUG_CONTROL_PORT: + port = ipc_port_copy_send(task->itk_debug_control); + break; + + default: + itk_unlock(task); + return KERN_INVALID_ARGUMENT; + } itk_unlock(task); *portp = port; @@ -574,42 +1168,52 @@ task_get_special_port( * KERN_INVALID_ARGUMENT The task is null. * KERN_FAILURE The task/space is dead. * KERN_INVALID_ARGUMENT Invalid special port. + * KERN_NO_ACCESS Attempted overwrite of seatbelt port. */ kern_return_t task_set_special_port( - task_t task, - int which, - ipc_port_t port) + task_t task, + int which, + ipc_port_t port) { ipc_port_t *whichp; ipc_port_t old; - if (task == TASK_NULL) + if (task == TASK_NULL) { return KERN_INVALID_ARGUMENT; + } + + if (task_is_driver(current_task())) { + return KERN_NO_ACCESS; + } switch (which) { - case TASK_KERNEL_PORT: + case TASK_KERNEL_PORT: whichp = &task->itk_sself; break; - case TASK_HOST_PORT: + case TASK_HOST_PORT: whichp = &task->itk_host; break; - case TASK_BOOTSTRAP_PORT: + case TASK_BOOTSTRAP_PORT: whichp = &task->itk_bootstrap; break; - case TASK_WIRED_LEDGER_PORT: - whichp = &task->wired_ledger_port; - break; + case TASK_SEATBELT_PORT: + whichp = &task->itk_seatbelt; + break; + + case TASK_ACCESS_PORT: + whichp = &task->itk_task_access; + break; + + case TASK_DEBUG_CONTROL_PORT: + whichp = &task->itk_debug_control; + break; - case TASK_PAGED_LEDGER_PORT: - whichp = &task->paged_ledger_port; - break; - - default: + default: return KERN_INVALID_ARGUMENT; }/* switch */ @@ -619,12 +1223,20 @@ task_set_special_port( return KERN_FAILURE; } + /* do not allow overwrite of seatbelt or task access ports */ + if ((TASK_SEATBELT_PORT == which || TASK_ACCESS_PORT == which) + && IP_VALID(*whichp)) { + itk_unlock(task); + return KERN_NO_ACCESS; + } + old = *whichp; *whichp = port; itk_unlock(task); - if (IP_VALID(old)) + if (IP_VALID(old)) { ipc_port_release_send(old); + } return KERN_SUCCESS; } @@ -645,30 +1257,35 @@ task_set_special_port( * KERN_SUCCESS Stashed the port rights. * KERN_INVALID_ARGUMENT The task is null. * KERN_INVALID_ARGUMENT The task is dead. + * KERN_INVALID_ARGUMENT The memory param is null. * KERN_INVALID_ARGUMENT Too many port rights supplied. */ kern_return_t mach_ports_register( - task_t task, - mach_port_array_t memory, - mach_msg_type_number_t portsCnt) + task_t task, + mach_port_array_t memory, + mach_msg_type_number_t portsCnt) { ipc_port_t ports[TASK_PORT_REGISTER_MAX]; - int i; + unsigned int i; if ((task == TASK_NULL) || - (portsCnt > TASK_PORT_REGISTER_MAX)) + (portsCnt > TASK_PORT_REGISTER_MAX) || + (portsCnt && memory == NULL)) { return KERN_INVALID_ARGUMENT; + } /* * Pad the port rights with nulls. */ - for (i = 0; i < portsCnt; i++) + for (i = 0; i < portsCnt; i++) { ports[i] = memory[i]; - for (; i < TASK_PORT_REGISTER_MAX; i++) + } + for (; i < TASK_PORT_REGISTER_MAX; i++) { ports[i] = IP_NULL; + } itk_lock(task); if (task->itk_self == IP_NULL) { @@ -691,18 +1308,21 @@ mach_ports_register( itk_unlock(task); - for (i = 0; i < TASK_PORT_REGISTER_MAX; i++) - if (IP_VALID(ports[i])) + for (i = 0; i < TASK_PORT_REGISTER_MAX; i++) { + if (IP_VALID(ports[i])) { ipc_port_release_send(ports[i]); + } + } /* * Now that the operation is known to be successful, * we can free the memory. */ - if (portsCnt != 0) - kfree((vm_offset_t) memory, - (vm_size_t) (portsCnt * sizeof(mach_port_t))); + if (portsCnt != 0) { + kfree(memory, + (vm_size_t) (portsCnt * sizeof(mach_port_t))); + } return KERN_SUCCESS; } @@ -723,25 +1343,25 @@ mach_ports_register( kern_return_t mach_ports_lookup( - task_t task, - mach_port_array_t *portsp, - mach_msg_type_number_t *portsCnt) + task_t task, + mach_port_array_t *portsp, + mach_msg_type_number_t *portsCnt) { - vm_offset_t memory; + void *memory; vm_size_t size; ipc_port_t *ports; int i; - kern_return_t kr; - - if (task == TASK_NULL) + if (task == TASK_NULL) { return KERN_INVALID_ARGUMENT; + } size = (vm_size_t) (TASK_PORT_REGISTER_MAX * sizeof(ipc_port_t)); memory = kalloc(size); - if (memory == 0) + if (memory == 0) { return KERN_RESOURCE_SHORTAGE; + } itk_lock(task); if (task->itk_self == IP_NULL) { @@ -758,8 +1378,9 @@ mach_ports_lookup( * is wired, we won't fault while holding the task lock. */ - for (i = 0; i < TASK_PORT_REGISTER_MAX; i++) + for (i = 0; i < TASK_PORT_REGISTER_MAX; i++) { ports[i] = ipc_port_copy_send(task->itk_registered[i]); + } itk_unlock(task); @@ -768,6 +1389,54 @@ mach_ports_lookup( return KERN_SUCCESS; } +extern zone_t task_zone; + +kern_return_t +task_conversion_eval(task_t caller, task_t victim) +{ + /* + * Tasks are allowed to resolve their own task ports, and the kernel is + * allowed to resolve anyone's task port. + */ + if (caller == kernel_task) { + return KERN_SUCCESS; + } + + if (caller == victim) { + return KERN_SUCCESS; + } + + /* + * Only the kernel can can resolve the kernel's task port. We've established + * by this point that the caller is not kernel_task. + */ + if (victim == TASK_NULL || victim == kernel_task) { + return KERN_INVALID_SECURITY; + } + + zone_require(victim, task_zone); + +#if CONFIG_EMBEDDED + /* + * On embedded platforms, only a platform binary can resolve the task port + * of another platform binary. + */ + if ((victim->t_flags & TF_PLATFORM) && !(caller->t_flags & TF_PLATFORM)) { +#if SECURE_KERNEL + return KERN_INVALID_SECURITY; +#else + if (cs_relax_platform_task_ports) { + return KERN_SUCCESS; + } else { + return KERN_INVALID_SECURITY; + } +#endif /* SECURE_KERNEL */ + } +#endif /* CONFIG_EMBEDDED */ + + return KERN_SUCCESS; +} + /* * Routine: convert_port_to_locked_task * Purpose: @@ -780,7 +1449,10 @@ mach_ports_lookup( task_t convert_port_to_locked_task(ipc_port_t port) { + int try_failed_count = 0; + while (IP_VALID(port)) { + task_t ct = current_task(); task_t task; ip_lock(port); @@ -791,21 +1463,123 @@ convert_port_to_locked_task(ipc_port_t port) task = (task_t) port->ip_kobject; assert(task != TASK_NULL); + if (task_conversion_eval(ct, task)) { + ip_unlock(port); + return TASK_NULL; + } + /* * Normal lock ordering puts task_lock() before ip_lock(). * Attempt out-of-order locking here. */ if (task_lock_try(task)) { ip_unlock(port); - return(task); + return task; } + try_failed_count++; ip_unlock(port); - mutex_pause(); + mutex_pause(try_failed_count); } return TASK_NULL; } +/* + * Routine: convert_port_to_locked_task_inspect + * Purpose: + * Internal helper routine to convert from a port to a locked + * task inspect right. Used by internal routines that try to convert from a + * task inspect port to a reference on some task related object. + * Conditions: + * Nothing locked, blocking OK. + */ +task_inspect_t +convert_port_to_locked_task_inspect(ipc_port_t port) +{ + int try_failed_count = 0; + + while (IP_VALID(port)) { + task_inspect_t task; + + ip_lock(port); + if (!ip_active(port) || (ip_kotype(port) != IKOT_TASK)) { + ip_unlock(port); + return TASK_INSPECT_NULL; + } + task = (task_inspect_t)port->ip_kobject; + assert(task != TASK_INSPECT_NULL); + /* + * Normal lock ordering puts task_lock() before ip_lock(). + * Attempt out-of-order locking here. + */ + if (task_lock_try((task_t)task)) { + ip_unlock(port); + return task; + } + try_failed_count++; + + ip_unlock(port); + mutex_pause(try_failed_count); + } + return TASK_INSPECT_NULL; +} + +static task_t +convert_port_to_task_locked( + ipc_port_t port, + uint32_t *exec_token) +{ + task_t task = TASK_NULL; + + ip_lock_held(port); + require_ip_active(port); + + if (ip_kotype(port) == IKOT_TASK) { + task_t ct = current_task(); + task = (task_t)port->ip_kobject; + assert(task != TASK_NULL); + + if (task_conversion_eval(ct, task)) { + return TASK_NULL; + } + + if (exec_token) { + *exec_token = task->exec_token; + } + task_reference_internal(task); + } + + return task; +} + +/* + * Routine: convert_port_to_task_with_exec_token + * Purpose: + * Convert from a port to a task and return + * the exec token stored in the task. + * Doesn't consume the port ref; produces a task ref, + * which may be null. + * Conditions: + * Nothing locked. + */ +task_t +convert_port_to_task_with_exec_token( + ipc_port_t port, + uint32_t *exec_token) +{ + task_t task = TASK_NULL; + + if (IP_VALID(port)) { + ip_lock(port); + if (ip_active(port)) { + task = convert_port_to_task_locked(port, exec_token); + } + ip_unlock(port); + } + + return task; +} + /* * Routine: convert_port_to_task * Purpose: @@ -817,15 +1591,119 @@ convert_port_to_locked_task(ipc_port_t port) */ task_t convert_port_to_task( - ipc_port_t port) + ipc_port_t port) { - task_t task; + return convert_port_to_task_with_exec_token(port, NULL); +} - task = convert_port_to_locked_task(port); - if (task) { - task->ref_count++; - task_unlock(task); + +/* + * Routine: convert_port_to_task_name + * Purpose: + * Convert from a port to a task name. + * Doesn't consume the port ref; produces a task name ref, + * which may be null. + * Conditions: + * Nothing locked. + */ +task_name_t +convert_port_to_task_name( + ipc_port_t port) +{ + task_name_t task = TASK_NULL; + + if (IP_VALID(port)) { + ip_lock(port); + + if (ip_active(port) && + (ip_kotype(port) == IKOT_TASK || + ip_kotype(port) == IKOT_TASK_NAME)) { + task = (task_name_t)port->ip_kobject; + assert(task != TASK_NAME_NULL); + + task_reference_internal(task); + } + + ip_unlock(port); + } + + return task; +} + +static task_inspect_t +convert_port_to_task_inspect_locked( + ipc_port_t port) +{ + task_inspect_t task = TASK_INSPECT_NULL; + + ip_lock_held(port); + require_ip_active(port); + + if (ip_kotype(port) == IKOT_TASK) { + task = (task_inspect_t)port->ip_kobject; + assert(task != TASK_INSPECT_NULL); + + task_reference_internal(task); + } + + return task; +} + +/* + * Routine: convert_port_to_task_inspect + * Purpose: + * Convert from a port to a task inspection right + * Doesn't consume the port ref; produces a task ref, + * which may be null. + * Conditions: + * Nothing locked. + */ +task_inspect_t +convert_port_to_task_inspect( + ipc_port_t port) +{ + task_inspect_t task = TASK_INSPECT_NULL; + + if (IP_VALID(port)) { + ip_lock(port); + if (ip_active(port)) { + task = convert_port_to_task_inspect_locked(port); + } + ip_unlock(port); } + + return task; +} + +/* + * Routine: convert_port_to_task_suspension_token + * Purpose: + * Convert from a port to a task suspension token. + * Doesn't consume the port ref; produces a suspension token ref, + * which may be null. + * Conditions: + * Nothing locked. + */ +task_suspension_token_t +convert_port_to_task_suspension_token( + ipc_port_t port) +{ + task_suspension_token_t task = TASK_NULL; + + if (IP_VALID(port)) { + ip_lock(port); + + if (ip_active(port) && + ip_kotype(port) == IKOT_TASK_RESUME) { + task = (task_suspension_token_t)port->ip_kobject; + assert(task != TASK_NULL); + + task_reference_internal(task); + } + + ip_unlock(port); + } + return task; } @@ -840,386 +1718,444 @@ convert_port_to_task( */ ipc_space_t convert_port_to_space( - ipc_port_t port) + ipc_port_t port) { ipc_space_t space; task_t task; task = convert_port_to_locked_task(port); - if (task == TASK_NULL) + if (task == TASK_NULL) { return IPC_SPACE_NULL; + } if (!task->active) { task_unlock(task); return IPC_SPACE_NULL; } - + space = task->itk_space; is_reference(space); task_unlock(task); - return (space); + return space; } -upl_t -convert_port_to_upl( - ipc_port_t port) +/* + * Routine: convert_port_to_space_inspect + * Purpose: + * Convert from a port to a space inspect right. + * Doesn't consume the port ref; produces a space inspect ref, + * which may be null. + * Conditions: + * Nothing locked. + */ +ipc_space_inspect_t +convert_port_to_space_inspect( + ipc_port_t port) { - upl_t upl; + ipc_space_inspect_t space; + task_inspect_t task; - ip_lock(port); - if (!ip_active(port) || (ip_kotype(port) != IKOT_UPL)) { - ip_unlock(port); - return (upl_t)NULL; - } - upl = (upl_t) port->ip_kobject; - ip_unlock(port); - upl_lock(upl); - upl->ref_count+=1; - upl_unlock(upl); - return upl; -} + task = convert_port_to_locked_task_inspect(port); -mach_port_t -convert_upl_to_port( - upl_t upl) -{ - return MACH_PORT_NULL; -} + if (task == TASK_INSPECT_NULL) { + return IPC_SPACE_INSPECT_NULL; + } -__private_extern__ void -upl_no_senders( - upl_t upl, - mach_port_mscount_t mscount) -{ - return; + if (!task->active) { + task_unlock(task); + return IPC_SPACE_INSPECT_NULL; + } + + space = (ipc_space_inspect_t)task->itk_space; + is_reference((ipc_space_t)space); + task_unlock((task_t)task); + return space; } /* - * Routine: convert_port_entry_to_map + * Routine: convert_port_to_map * Purpose: - * Convert from a port specifying an entry or a task - * to a map. Doesn't consume the port ref; produces a map ref, - * which may be null. Unlike convert_port_to_map, the - * port may be task or a named entry backed. + * Convert from a port to a map. + * Doesn't consume the port ref; produces a map ref, + * which may be null. * Conditions: * Nothing locked. */ - vm_map_t -convert_port_entry_to_map( - ipc_port_t port) +convert_port_to_map( + ipc_port_t port) { task_t task; vm_map_t map; - vm_named_entry_t named_entry; - - if(IP_VALID(port) && (ip_kotype(port) == IKOT_NAMED_ENTRY)) { - while(TRUE) { - ip_lock(port); - if(ip_active(port) && (ip_kotype(port) - == IKOT_NAMED_ENTRY)) { - named_entry = - (vm_named_entry_t)port->ip_kobject; - if (!(mutex_try(&(named_entry)->Lock))) { - ip_unlock(port); - mutex_pause(); - continue; - } - named_entry->ref_count++; - mutex_unlock(&(named_entry)->Lock); - ip_unlock(port); - if ((named_entry->is_sub_map) && - (named_entry->protection - & VM_PROT_WRITE)) { - map = named_entry->backing.map; - } else { - mach_destroy_memory_entry(port); - return VM_MAP_NULL; - } - vm_map_reference_swap(map); - mach_destroy_memory_entry(port); - break; - } - else - return VM_MAP_NULL; - } - } else { - task_t task; - task = convert_port_to_locked_task(port); - - if (task == TASK_NULL) - return VM_MAP_NULL; + task = convert_port_to_locked_task(port); + + if (task == TASK_NULL) { + return VM_MAP_NULL; + } - if (!task->active) { - task_unlock(task); - return VM_MAP_NULL; - } - - map = task->map; - vm_map_reference_swap(map); + if (!task->active) { task_unlock(task); + return VM_MAP_NULL; } + map = task->map; + vm_map_reference_swap(map); + task_unlock(task); return map; } + /* - * Routine: convert_port_entry_to_object + * Routine: convert_port_to_thread * Purpose: - * Convert from a port specifying a named entry to an - * object. Doesn't consume the port ref; produces a map ref, - * which may be null. + * Convert from a port to a thread. + * Doesn't consume the port ref; produces an thread ref, + * which may be null. * Conditions: * Nothing locked. */ - -vm_object_t -convert_port_entry_to_object( - ipc_port_t port) +static thread_t +convert_port_to_thread_locked( + ipc_port_t port, + port_to_thread_options_t options) { - vm_object_t object; - vm_named_entry_t named_entry; - - if(IP_VALID(port) && (ip_kotype(port) == IKOT_NAMED_ENTRY)) { - while(TRUE) { - ip_lock(port); - if(ip_active(port) && (ip_kotype(port) - == IKOT_NAMED_ENTRY)) { - named_entry = - (vm_named_entry_t)port->ip_kobject; - if (!(mutex_try(&(named_entry)->Lock))) { - ip_unlock(port); - mutex_pause(); - continue; - } - named_entry->ref_count++; - mutex_unlock(&(named_entry)->Lock); - ip_unlock(port); - if ((!named_entry->is_sub_map) && - (named_entry->protection - & VM_PROT_WRITE)) { - object = named_entry->object; - } else { - mach_destroy_memory_entry(port); - return (vm_object_t)NULL; - } - vm_object_reference(named_entry->object); - mach_destroy_memory_entry(port); - break; + thread_t thread = THREAD_NULL; + + ip_lock_held(port); + require_ip_active(port); + + if (ip_kotype(port) == IKOT_THREAD) { + thread = (thread_t)port->ip_kobject; + assert(thread != THREAD_NULL); + + if (options & PORT_TO_THREAD_NOT_CURRENT_THREAD) { + if (thread == current_thread()) { + return THREAD_NULL; } - else - return (vm_object_t)NULL; } - } else { - return (vm_object_t)NULL; + + if (options & PORT_TO_THREAD_IN_CURRENT_TASK) { + if (thread->task != current_task()) { + return THREAD_NULL; + } + } else { + /* Use task conversion rules for thread control conversions */ + if (task_conversion_eval(current_task(), thread->task) != KERN_SUCCESS) { + return THREAD_NULL; + } + } + + thread_reference_internal(thread); } - return object; + return thread; +} + +thread_t +convert_port_to_thread( + ipc_port_t port) +{ + thread_t thread = THREAD_NULL; + + if (IP_VALID(port)) { + ip_lock(port); + if (ip_active(port)) { + thread = convert_port_to_thread_locked(port, PORT_TO_THREAD_NONE); + } + ip_unlock(port); + } + + return thread; } /* - * Routine: convert_port_to_map + * Routine: convert_port_to_thread_inspect * Purpose: - * Convert from a port to a map. - * Doesn't consume the port ref; produces a map ref, + * Convert from a port to a thread inspection right + * Doesn't consume the port ref; produces a thread ref, * which may be null. * Conditions: * Nothing locked. */ +thread_inspect_t +convert_port_to_thread_inspect( + ipc_port_t port) +{ + thread_inspect_t thread = THREAD_INSPECT_NULL; -vm_map_t -convert_port_to_map( - ipc_port_t port) + if (IP_VALID(port)) { + ip_lock(port); + + if (ip_active(port) && + ip_kotype(port) == IKOT_THREAD) { + thread = (thread_inspect_t)port->ip_kobject; + assert(thread != THREAD_INSPECT_NULL); + thread_reference_internal((thread_t)thread); + } + ip_unlock(port); + } + + return thread; +} + +/* + * Routine: convert_thread_inspect_to_port + * Purpose: + * Convert from a thread inspect reference to a port. + * Consumes a thread ref; + * As we never export thread inspect ports, always + * creates a NULL port. + * Conditions: + * Nothing locked. + */ + +ipc_port_t +convert_thread_inspect_to_port(thread_inspect_t thread) { - task_t task; - vm_map_t map; + thread_deallocate(thread); + return IP_NULL; +} - task = convert_port_to_locked_task(port); - - if (task == TASK_NULL) - return VM_MAP_NULL; - if (!task->active) { - task_unlock(task); - return VM_MAP_NULL; +/* + * Routine: port_name_to_thread + * Purpose: + * Convert from a port name to an thread reference + * A name of MACH_PORT_NULL is valid for the null thread. + * Conditions: + * Nothing locked. + */ +thread_t +port_name_to_thread( + mach_port_name_t name, + port_to_thread_options_t options) +{ + thread_t thread = THREAD_NULL; + ipc_port_t kport; + kern_return_t kr; + + if (MACH_PORT_VALID(name)) { + kr = ipc_port_translate_send(current_space(), name, &kport); + if (kr == KERN_SUCCESS) { + thread = convert_port_to_thread_locked(kport, options); + ip_unlock(kport); + } } - - map = task->map; - vm_map_reference_swap(map); - task_unlock(task); - return map; + + return thread; +} + +task_t +port_name_to_task( + mach_port_name_t name) +{ + ipc_port_t kport; + kern_return_t kr; + task_t task = TASK_NULL; + + if (MACH_PORT_VALID(name)) { + kr = ipc_port_translate_send(current_space(), name, &kport); + if (kr == KERN_SUCCESS) { + task = convert_port_to_task_locked(kport, NULL); + ip_unlock(kport); + } + } + return task; } +task_inspect_t +port_name_to_task_inspect( + mach_port_name_t name) +{ + ipc_port_t kport; + kern_return_t kr; + task_inspect_t ti = TASK_INSPECT_NULL; + + if (MACH_PORT_VALID(name)) { + kr = ipc_port_translate_send(current_space(), name, &kport); + if (kr == KERN_SUCCESS) { + ti = convert_port_to_task_inspect_locked(kport); + ip_unlock(kport); + } + } + return ti; +} /* - * Routine: convert_port_to_act + * Routine: port_name_to_host * Purpose: - * Convert from a port to a thr_act. - * Doesn't consume the port ref; produces an thr_act ref, - * which may be null. + * Convert from a port name to a host pointer. + * NOTE: This does _not_ return a +1 reference to the host_t * Conditions: * Nothing locked. */ - -thread_act_t -convert_port_to_act( ipc_port_t port ) +host_t +port_name_to_host( + mach_port_name_t name) { - boolean_t r; - thread_act_t thr_act = 0; + host_t host = HOST_NULL; + kern_return_t kr; + ipc_port_t port; - r = FALSE; - while (!r && IP_VALID(port)) { - ip_lock(port); - r = ref_act_port_locked(port, &thr_act); - /* port unlocked */ + if (MACH_PORT_VALID(name)) { + kr = ipc_port_translate_send(current_space(), name, &port); + if (kr == KERN_SUCCESS) { + host = convert_port_to_host(port); + ip_unlock(port); + } } - return (thr_act); + return host; } -boolean_t -ref_act_port_locked( ipc_port_t port, thread_act_t *pthr_act ) +/* + * Routine: convert_task_to_port + * Purpose: + * Convert from a task to a port. + * Consumes a task ref; produces a naked send right + * which may be invalid. + * Conditions: + * Nothing locked. + */ + +ipc_port_t +convert_task_to_port( + task_t task) { - thread_act_t thr_act; + ipc_port_t port; - thr_act = 0; - if (ip_active(port) && - (ip_kotype(port) == IKOT_ACT)) { - thr_act = (thread_act_t) port->ip_kobject; - assert(thr_act != THR_ACT_NULL); + itk_lock(task); - /* - * Normal lock ordering is act_lock(), then ip_lock(). - * Allow out-of-order locking here, using - * act_reference_act_locked() to accomodate it. - */ - if (!act_lock_try(thr_act)) { - ip_unlock(port); - mutex_pause(); - return (FALSE); - } - act_locked_act_reference(thr_act); - act_unlock(thr_act); + if (task->itk_self != IP_NULL) { + port = ipc_port_make_send(task->itk_self); + } else { + port = IP_NULL; } - *pthr_act = thr_act; - ip_unlock(port); - return (TRUE); + + itk_unlock(task); + + task_deallocate(task); + return port; } /* - * Routine: port_name_to_act + * Routine: convert_task_inspect_to_port * Purpose: - * Convert from a port name to an act reference - * A name of MACH_PORT_NULL is valid for the null act + * Convert from a task inspect reference to a port. + * Consumes a task ref; + * As we never export task inspect ports, always + * creates a NULL port. * Conditions: * Nothing locked. */ -thread_act_t -port_name_to_act( - mach_port_name_t name) +ipc_port_t +convert_task_inspect_to_port( + task_inspect_t task) { - thread_act_t thr_act = THR_ACT_NULL; - ipc_port_t kern_port; - kern_return_t kr; + task_deallocate(task); - if (MACH_PORT_VALID(name)) { - kr = ipc_object_copyin(current_space(), name, - MACH_MSG_TYPE_COPY_SEND, - (ipc_object_t *) &kern_port); - if (kr != KERN_SUCCESS) - return THR_ACT_NULL; - - thr_act = convert_port_to_act(kern_port); - - if (IP_VALID(kern_port)) - ipc_port_release_send(kern_port); - } - return thr_act; + return IP_NULL; } -task_t -port_name_to_task( - mach_port_name_t name) +/* + * Routine: convert_task_suspend_token_to_port + * Purpose: + * Convert from a task suspension token to a port. + * Consumes a task suspension token ref; produces a naked send-once right + * which may be invalid. + * Conditions: + * Nothing locked. + */ +ipc_port_t +convert_task_suspension_token_to_port( + task_suspension_token_t task) { - ipc_port_t kern_port; - kern_return_t kr; - task_t task = TASK_NULL; - - if (MACH_PORT_VALID(name)) { - kr = ipc_object_copyin(current_space(), name, - MACH_MSG_TYPE_COPY_SEND, - (ipc_object_t *) &kern_port); - if (kr != KERN_SUCCESS) - return TASK_NULL; + ipc_port_t port; - task = convert_port_to_task(kern_port); + task_lock(task); + if (task->active) { + if (task->itk_resume == IP_NULL) { + task->itk_resume = ipc_kobject_alloc_port((ipc_kobject_t) task, + IKOT_TASK_RESUME, IPC_KOBJECT_ALLOC_NONE); + } - if (IP_VALID(kern_port)) - ipc_port_release_send(kern_port); + /* + * Create a send-once right for each instance of a direct user-called + * task_suspend2 call. Each time one of these send-once rights is abandoned, + * the notification handler will resume the target task. + */ + port = ipc_port_make_sonce(task->itk_resume); + assert(IP_VALID(port)); + } else { + port = IP_NULL; } - return task; + + task_unlock(task); + task_suspension_token_deallocate(task); + + return port; } + /* - * Routine: convert_task_to_port + * Routine: convert_task_name_to_port * Purpose: - * Convert from a task to a port. - * Consumes a task ref; produces a naked send right - * which may be invalid. + * Convert from a task name ref to a port. + * Consumes a task name ref; produces a naked send right + * which may be invalid. * Conditions: * Nothing locked. */ ipc_port_t -convert_task_to_port( - task_t task) +convert_task_name_to_port( + task_name_t task_name) { ipc_port_t port; - itk_lock(task); - if (task->itk_self != IP_NULL) -#if NORMA_TASK - if (task->map == VM_MAP_NULL) - /* norma placeholder task */ - port = ipc_port_copy_send(task->itk_self); - else -#endif /* NORMA_TASK */ - port = ipc_port_make_send(task->itk_self); - else + itk_lock(task_name); + if (task_name->itk_nself != IP_NULL) { + port = ipc_port_make_send(task_name->itk_nself); + } else { port = IP_NULL; - itk_unlock(task); + } + itk_unlock(task_name); - task_deallocate(task); + task_name_deallocate(task_name); return port; } /* - * Routine: convert_act_to_port + * Routine: convert_thread_to_port * Purpose: - * Convert from a thr_act to a port. - * Consumes an thr_act ref; produces a naked send right + * Convert from a thread to a port. + * Consumes an thread ref; produces a naked send right * which may be invalid. * Conditions: * Nothing locked. */ ipc_port_t -convert_act_to_port(thr_act) - thread_act_t thr_act; +convert_thread_to_port( + thread_t thread) { - ipc_port_t port; + ipc_port_t port; - act_lock(thr_act); - if (thr_act->ith_self != IP_NULL) - port = ipc_port_make_send(thr_act->ith_self); - else + thread_mtx_lock(thread); + + if (thread->ith_self != IP_NULL) { + port = ipc_port_make_send(thread->ith_self); + } else { port = IP_NULL; - act_unlock(thr_act); + } + + thread_mtx_unlock(thread); + + thread_deallocate(thread); - act_deallocate(thr_act); return port; } @@ -1233,10 +2169,28 @@ convert_act_to_port(thr_act) void space_deallocate( - ipc_space_t space) + ipc_space_t space) { - if (space != IS_NULL) + if (space != IS_NULL) { is_release(space); + } +} + +/* + * Routine: space_inspect_deallocate + * Purpose: + * Deallocate a space inspect ref produced by convert_port_to_space_inspect. + * Conditions: + * Nothing locked. + */ + +void +space_inspect_deallocate( + ipc_space_inspect_t space) +{ + if (space != IS_INSPECT_NULL) { + is_release((ipc_space_t)space); + } } /* @@ -1259,132 +2213,191 @@ space_deallocate( kern_return_t thread_set_exception_ports( - thread_act_t thr_act, - exception_mask_t exception_mask, - ipc_port_t new_port, - exception_behavior_t new_behavior, - thread_state_flavor_t new_flavor) + thread_t thread, + exception_mask_t exception_mask, + ipc_port_t new_port, + exception_behavior_t new_behavior, + thread_state_flavor_t new_flavor) { - register int i; - ipc_port_t old_port[EXC_TYPES_COUNT]; + ipc_port_t old_port[EXC_TYPES_COUNT]; + boolean_t privileged = current_task()->sec_token.val[0] == 0; + register int i; - if (!thr_act) +#if CONFIG_MACF + struct label *new_label; +#endif + + if (thread == THREAD_NULL) { return KERN_INVALID_ARGUMENT; + } - if (exception_mask & ~EXC_MASK_ALL) + if (exception_mask & ~EXC_MASK_VALID) { return KERN_INVALID_ARGUMENT; + } if (IP_VALID(new_port)) { - switch (new_behavior) { + switch (new_behavior & ~MACH_EXCEPTION_MASK) { case EXCEPTION_DEFAULT: case EXCEPTION_STATE: case EXCEPTION_STATE_IDENTITY: break; + default: return KERN_INVALID_ARGUMENT; } } - /* + /* * Check the validity of the thread_state_flavor by calling the * VALID_THREAD_STATE_FLAVOR architecture dependent macro defined in * osfmk/mach/ARCHITECTURE/thread_status.h */ - if (!VALID_THREAD_STATE_FLAVOR(new_flavor)) { + if (new_flavor != 0 && !VALID_THREAD_STATE_FLAVOR(new_flavor)) { return KERN_INVALID_ARGUMENT; } - act_lock(thr_act); - if (!thr_act->active) { - act_unlock(thr_act); +#if CONFIG_MACF + new_label = mac_exc_create_label_for_current_proc(); +#endif + + thread_mtx_lock(thread); + + if (!thread->active) { + thread_mtx_unlock(thread); + return KERN_FAILURE; } - for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; i++) { - if (exception_mask & (1 << i)) { - old_port[i] = thr_act->exc_actions[i].port; - thr_act->exc_actions[i].port = - ipc_port_copy_send(new_port); - thr_act->exc_actions[i].behavior = new_behavior; - thr_act->exc_actions[i].flavor = new_flavor; - } else + if (thread->exc_actions == NULL) { + ipc_thread_init_exc_actions(thread); + } + for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; ++i) { + if ((exception_mask & (1 << i)) +#if CONFIG_MACF + && mac_exc_update_action_label(&thread->exc_actions[i], new_label) == 0 +#endif + ) { + old_port[i] = thread->exc_actions[i].port; + thread->exc_actions[i].port = ipc_port_copy_send(new_port); + thread->exc_actions[i].behavior = new_behavior; + thread->exc_actions[i].flavor = new_flavor; + thread->exc_actions[i].privileged = privileged; + } else { old_port[i] = IP_NULL; - }/* for */ - /* - * Consume send rights without any lock held. - */ - act_unlock(thr_act); - for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; i++) - if (IP_VALID(old_port[i])) + } + } + + thread_mtx_unlock(thread); + +#if CONFIG_MACF + mac_exc_free_label(new_label); +#endif + + for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; ++i) { + if (IP_VALID(old_port[i])) { ipc_port_release_send(old_port[i]); - if (IP_VALID(new_port)) /* consume send right */ + } + } + + if (IP_VALID(new_port)) { /* consume send right */ ipc_port_release_send(new_port); + } - return KERN_SUCCESS; -}/* thread_set_exception_port */ + return KERN_SUCCESS; +} kern_return_t task_set_exception_ports( - task_t task, - exception_mask_t exception_mask, - ipc_port_t new_port, - exception_behavior_t new_behavior, - thread_state_flavor_t new_flavor) + task_t task, + exception_mask_t exception_mask, + ipc_port_t new_port, + exception_behavior_t new_behavior, + thread_state_flavor_t new_flavor) { - register int i; - ipc_port_t old_port[EXC_TYPES_COUNT]; + ipc_port_t old_port[EXC_TYPES_COUNT]; + boolean_t privileged = current_task()->sec_token.val[0] == 0; + register int i; + +#if CONFIG_MACF + struct label *new_label; +#endif if (task == TASK_NULL) { return KERN_INVALID_ARGUMENT; } - if (exception_mask & ~EXC_MASK_ALL) { + if (exception_mask & ~EXC_MASK_VALID) { return KERN_INVALID_ARGUMENT; } if (IP_VALID(new_port)) { - switch (new_behavior) { + switch (new_behavior & ~MACH_EXCEPTION_MASK) { case EXCEPTION_DEFAULT: case EXCEPTION_STATE: case EXCEPTION_STATE_IDENTITY: break; + default: return KERN_INVALID_ARGUMENT; } } - /* Cannot easily check "new_flavor", but that just means that - * the flavor in the generated exception message might be garbage: - * GIGO */ - itk_lock(task); - if (task->itk_self == IP_NULL) { - itk_unlock(task); - return KERN_FAILURE; - } + /* + * Check the validity of the thread_state_flavor by calling the + * VALID_THREAD_STATE_FLAVOR architecture dependent macro defined in + * osfmk/mach/ARCHITECTURE/thread_status.h + */ + if (new_flavor != 0 && !VALID_THREAD_STATE_FLAVOR(new_flavor)) { + return KERN_INVALID_ARGUMENT; + } + +#if CONFIG_MACF + new_label = mac_exc_create_label_for_current_proc(); +#endif - for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; i++) { - if (exception_mask & (1 << i)) { + itk_lock(task); + + if (task->itk_self == IP_NULL) { + itk_unlock(task); + + return KERN_FAILURE; + } + + for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; ++i) { + if ((exception_mask & (1 << i)) +#if CONFIG_MACF + && mac_exc_update_action_label(&task->exc_actions[i], new_label) == 0 +#endif + ) { old_port[i] = task->exc_actions[i].port; task->exc_actions[i].port = - ipc_port_copy_send(new_port); + ipc_port_copy_send(new_port); task->exc_actions[i].behavior = new_behavior; task->exc_actions[i].flavor = new_flavor; - } else + task->exc_actions[i].privileged = privileged; + } else { old_port[i] = IP_NULL; - }/* for */ + } + } - /* - * Consume send rights without any lock held. - */ - itk_unlock(task); - for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; i++) - if (IP_VALID(old_port[i])) + itk_unlock(task); + +#if CONFIG_MACF + mac_exc_free_label(new_label); +#endif + + for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; ++i) { + if (IP_VALID(old_port[i])) { ipc_port_release_send(old_port[i]); - if (IP_VALID(new_port)) /* consume send right */ + } + } + + if (IP_VALID(new_port)) { /* consume send right */ ipc_port_release_send(new_port); + } - return KERN_SUCCESS; -}/* task_set_exception_port */ + return KERN_SUCCESS; +} /* * Routine: thread/task_swap_exception_ports [kernel call] @@ -1415,197 +2428,241 @@ task_set_exception_ports( kern_return_t thread_swap_exception_ports( - thread_act_t thr_act, - exception_mask_t exception_mask, - ipc_port_t new_port, - exception_behavior_t new_behavior, - thread_state_flavor_t new_flavor, - exception_mask_array_t masks, - mach_msg_type_number_t * CountCnt, - exception_port_array_t ports, + thread_t thread, + exception_mask_t exception_mask, + ipc_port_t new_port, + exception_behavior_t new_behavior, + thread_state_flavor_t new_flavor, + exception_mask_array_t masks, + mach_msg_type_number_t *CountCnt, + exception_port_array_t ports, exception_behavior_array_t behaviors, - thread_state_flavor_array_t flavors ) + thread_state_flavor_array_t flavors) { - register int i, - j, - count; - ipc_port_t old_port[EXC_TYPES_COUNT]; + ipc_port_t old_port[EXC_TYPES_COUNT]; + boolean_t privileged = current_task()->sec_token.val[0] == 0; + unsigned int i, j, count; - if (!thr_act) +#if CONFIG_MACF + struct label *new_label; +#endif + + if (thread == THREAD_NULL) { return KERN_INVALID_ARGUMENT; + } - if (exception_mask & ~EXC_MASK_ALL) { + if (exception_mask & ~EXC_MASK_VALID) { return KERN_INVALID_ARGUMENT; } if (IP_VALID(new_port)) { - switch (new_behavior) { + switch (new_behavior & ~MACH_EXCEPTION_MASK) { case EXCEPTION_DEFAULT: case EXCEPTION_STATE: case EXCEPTION_STATE_IDENTITY: break; + default: return KERN_INVALID_ARGUMENT; } } - /* Cannot easily check "new_flavor", but that just means that - * the flavor in the generated exception message might be garbage: - * GIGO */ - act_lock(thr_act); - if (!thr_act->active) { - act_unlock(thr_act); + if (new_flavor != 0 && !VALID_THREAD_STATE_FLAVOR(new_flavor)) { + return KERN_INVALID_ARGUMENT; + } + +#if CONFIG_MACF + new_label = mac_exc_create_label_for_current_proc(); +#endif + + thread_mtx_lock(thread); + + if (!thread->active) { + thread_mtx_unlock(thread); + return KERN_FAILURE; } - count = 0; + if (thread->exc_actions == NULL) { + ipc_thread_init_exc_actions(thread); + } - for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; i++) { - if (exception_mask & (1 << i)) { - for (j = 0; j < count; j++) { -/* - * search for an identical entry, if found - * set corresponding mask for this exception. - */ - if (thr_act->exc_actions[i].port == ports[j] && - thr_act->exc_actions[i].behavior ==behaviors[j] - && thr_act->exc_actions[i].flavor ==flavors[j]) - { + assert(EXC_TYPES_COUNT > FIRST_EXCEPTION); + for (count = 0, i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT && count < *CountCnt; ++i) { + if ((exception_mask & (1 << i)) +#if CONFIG_MACF + && mac_exc_update_action_label(&thread->exc_actions[i], new_label) == 0 +#endif + ) { + for (j = 0; j < count; ++j) { + /* + * search for an identical entry, if found + * set corresponding mask for this exception. + */ + if (thread->exc_actions[i].port == ports[j] && + thread->exc_actions[i].behavior == behaviors[j] && + thread->exc_actions[i].flavor == flavors[j]) { masks[j] |= (1 << i); break; } - }/* for */ + } + if (j == count) { masks[j] = (1 << i); - ports[j] = - ipc_port_copy_send(thr_act->exc_actions[i].port); + ports[j] = ipc_port_copy_send(thread->exc_actions[i].port); - behaviors[j] = thr_act->exc_actions[i].behavior; - flavors[j] = thr_act->exc_actions[i].flavor; - count++; + behaviors[j] = thread->exc_actions[i].behavior; + flavors[j] = thread->exc_actions[i].flavor; + ++count; } - old_port[i] = thr_act->exc_actions[i].port; - thr_act->exc_actions[i].port = - ipc_port_copy_send(new_port); - thr_act->exc_actions[i].behavior = new_behavior; - thr_act->exc_actions[i].flavor = new_flavor; - if (count > *CountCnt) { - break; - } - } else + old_port[i] = thread->exc_actions[i].port; + thread->exc_actions[i].port = ipc_port_copy_send(new_port); + thread->exc_actions[i].behavior = new_behavior; + thread->exc_actions[i].flavor = new_flavor; + thread->exc_actions[i].privileged = privileged; + } else { old_port[i] = IP_NULL; - }/* for */ + } + } - /* - * Consume send rights without any lock held. - */ - act_unlock(thr_act); - for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; i++) - if (IP_VALID(old_port[i])) + thread_mtx_unlock(thread); + +#if CONFIG_MACF + mac_exc_free_label(new_label); +#endif + + while (--i >= FIRST_EXCEPTION) { + if (IP_VALID(old_port[i])) { ipc_port_release_send(old_port[i]); - if (IP_VALID(new_port)) /* consume send right */ + } + } + + if (IP_VALID(new_port)) { /* consume send right */ ipc_port_release_send(new_port); + } + *CountCnt = count; + return KERN_SUCCESS; -}/* thread_swap_exception_ports */ +} kern_return_t task_swap_exception_ports( - task_t task, - exception_mask_t exception_mask, - ipc_port_t new_port, - exception_behavior_t new_behavior, - thread_state_flavor_t new_flavor, - exception_mask_array_t masks, - mach_msg_type_number_t * CountCnt, - exception_port_array_t ports, + task_t task, + exception_mask_t exception_mask, + ipc_port_t new_port, + exception_behavior_t new_behavior, + thread_state_flavor_t new_flavor, + exception_mask_array_t masks, + mach_msg_type_number_t *CountCnt, + exception_port_array_t ports, exception_behavior_array_t behaviors, - thread_state_flavor_array_t flavors ) + thread_state_flavor_array_t flavors) { - register int i, - j, - count; - ipc_port_t old_port[EXC_TYPES_COUNT]; + ipc_port_t old_port[EXC_TYPES_COUNT]; + boolean_t privileged = current_task()->sec_token.val[0] == 0; + unsigned int i, j, count; + +#if CONFIG_MACF + struct label *new_label; +#endif - if (task == TASK_NULL) + if (task == TASK_NULL) { return KERN_INVALID_ARGUMENT; + } - if (exception_mask & ~EXC_MASK_ALL) { + if (exception_mask & ~EXC_MASK_VALID) { return KERN_INVALID_ARGUMENT; } if (IP_VALID(new_port)) { - switch (new_behavior) { + switch (new_behavior & ~MACH_EXCEPTION_MASK) { case EXCEPTION_DEFAULT: case EXCEPTION_STATE: case EXCEPTION_STATE_IDENTITY: break; + default: return KERN_INVALID_ARGUMENT; } } - /* Cannot easily check "new_flavor", but that just means that - * the flavor in the generated exception message might be garbage: - * GIGO */ + + if (new_flavor != 0 && !VALID_THREAD_STATE_FLAVOR(new_flavor)) { + return KERN_INVALID_ARGUMENT; + } + +#if CONFIG_MACF + new_label = mac_exc_create_label_for_current_proc(); +#endif itk_lock(task); + if (task->itk_self == IP_NULL) { itk_unlock(task); + return KERN_FAILURE; } - count = 0; - - for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; i++) { - if (exception_mask & (1 << i)) { + assert(EXC_TYPES_COUNT > FIRST_EXCEPTION); + for (count = 0, i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT && count < *CountCnt; ++i) { + if ((exception_mask & (1 << i)) +#if CONFIG_MACF + && mac_exc_update_action_label(&task->exc_actions[i], new_label) == 0 +#endif + ) { for (j = 0; j < count; j++) { -/* - * search for an identical entry, if found - * set corresponding mask for this exception. - */ + /* + * search for an identical entry, if found + * set corresponding mask for this exception. + */ if (task->exc_actions[i].port == ports[j] && - task->exc_actions[i].behavior == behaviors[j] - && task->exc_actions[i].flavor == flavors[j]) - { + task->exc_actions[i].behavior == behaviors[j] && + task->exc_actions[i].flavor == flavors[j]) { masks[j] |= (1 << i); break; } - }/* for */ + } + if (j == count) { masks[j] = (1 << i); - ports[j] = - ipc_port_copy_send(task->exc_actions[i].port); + ports[j] = ipc_port_copy_send(task->exc_actions[i].port); behaviors[j] = task->exc_actions[i].behavior; flavors[j] = task->exc_actions[i].flavor; - count++; + ++count; } + old_port[i] = task->exc_actions[i].port; - task->exc_actions[i].port = - ipc_port_copy_send(new_port); + + task->exc_actions[i].port = ipc_port_copy_send(new_port); task->exc_actions[i].behavior = new_behavior; task->exc_actions[i].flavor = new_flavor; - if (count > *CountCnt) { - break; - } - } else + task->exc_actions[i].privileged = privileged; + } else { old_port[i] = IP_NULL; - }/* for */ - + } + } - /* - * Consume send rights without any lock held. - */ itk_unlock(task); - for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; i++) - if (IP_VALID(old_port[i])) + +#if CONFIG_MACF + mac_exc_free_label(new_label); +#endif + + while (--i >= FIRST_EXCEPTION) { + if (IP_VALID(old_port[i])) { ipc_port_release_send(old_port[i]); - if (IP_VALID(new_port)) /* consume send right */ + } + } + + if (IP_VALID(new_port)) { /* consume send right */ ipc_port_release_send(new_port); + } + *CountCnt = count; return KERN_SUCCESS; -}/* task_swap_exception_ports */ +} /* * Routine: thread/task_get_exception_ports [kernel call] @@ -1628,128 +2685,135 @@ task_swap_exception_ports( kern_return_t thread_get_exception_ports( - thread_act_t thr_act, - exception_mask_t exception_mask, - exception_mask_array_t masks, - mach_msg_type_number_t * CountCnt, - exception_port_array_t ports, + thread_t thread, + exception_mask_t exception_mask, + exception_mask_array_t masks, + mach_msg_type_number_t *CountCnt, + exception_port_array_t ports, exception_behavior_array_t behaviors, - thread_state_flavor_array_t flavors ) + thread_state_flavor_array_t flavors) { - register int i, - j, - count; + unsigned int i, j, count; - if (!thr_act) + if (thread == THREAD_NULL) { return KERN_INVALID_ARGUMENT; + } - if (exception_mask & ~EXC_MASK_ALL) { + if (exception_mask & ~EXC_MASK_VALID) { return KERN_INVALID_ARGUMENT; } - act_lock(thr_act); - if (!thr_act->active) { - act_unlock(thr_act); + thread_mtx_lock(thread); + + if (!thread->active) { + thread_mtx_unlock(thread); + return KERN_FAILURE; } count = 0; - for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; i++) { + if (thread->exc_actions == NULL) { + goto done; + } + + for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; ++i) { if (exception_mask & (1 << i)) { - for (j = 0; j < count; j++) { -/* - * search for an identical entry, if found - * set corresponding mask for this exception. - */ - if (thr_act->exc_actions[i].port == ports[j] && - thr_act->exc_actions[i].behavior ==behaviors[j] - && thr_act->exc_actions[i].flavor == flavors[j]) - { + for (j = 0; j < count; ++j) { + /* + * search for an identical entry, if found + * set corresponding mask for this exception. + */ + if (thread->exc_actions[i].port == ports[j] && + thread->exc_actions[i].behavior == behaviors[j] && + thread->exc_actions[i].flavor == flavors[j]) { masks[j] |= (1 << i); break; } - }/* for */ + } + if (j == count) { masks[j] = (1 << i); - ports[j] = - ipc_port_copy_send(thr_act->exc_actions[i].port); - behaviors[j] = thr_act->exc_actions[i].behavior; - flavors[j] = thr_act->exc_actions[i].flavor; - count++; + ports[j] = ipc_port_copy_send(thread->exc_actions[i].port); + behaviors[j] = thread->exc_actions[i].behavior; + flavors[j] = thread->exc_actions[i].flavor; + ++count; if (count >= *CountCnt) { break; } } } - }/* for */ + } - act_unlock(thr_act); +done: + thread_mtx_unlock(thread); *CountCnt = count; + return KERN_SUCCESS; -}/* thread_get_exception_ports */ +} kern_return_t task_get_exception_ports( - task_t task, - exception_mask_t exception_mask, - exception_mask_array_t masks, - mach_msg_type_number_t * CountCnt, - exception_port_array_t ports, + task_t task, + exception_mask_t exception_mask, + exception_mask_array_t masks, + mach_msg_type_number_t *CountCnt, + exception_port_array_t ports, exception_behavior_array_t behaviors, - thread_state_flavor_array_t flavors ) + thread_state_flavor_array_t flavors) { - register int i, - j, - count; + unsigned int i, j, count; - if (task == TASK_NULL) + if (task == TASK_NULL) { return KERN_INVALID_ARGUMENT; + } - if (exception_mask & ~EXC_MASK_ALL) { + if (exception_mask & ~EXC_MASK_VALID) { return KERN_INVALID_ARGUMENT; } itk_lock(task); + if (task->itk_self == IP_NULL) { itk_unlock(task); + return KERN_FAILURE; } count = 0; - for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; i++) { + for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; ++i) { if (exception_mask & (1 << i)) { - for (j = 0; j < count; j++) { -/* - * search for an identical entry, if found - * set corresponding mask for this exception. - */ + for (j = 0; j < count; ++j) { + /* + * search for an identical entry, if found + * set corresponding mask for this exception. + */ if (task->exc_actions[i].port == ports[j] && - task->exc_actions[i].behavior == behaviors[j] - && task->exc_actions[i].flavor == flavors[j]) - { + task->exc_actions[i].behavior == behaviors[j] && + task->exc_actions[i].flavor == flavors[j]) { masks[j] |= (1 << i); break; } - }/* for */ + } + if (j == count) { masks[j] = (1 << i); - ports[j] = - ipc_port_copy_send(task->exc_actions[i].port); + ports[j] = ipc_port_copy_send(task->exc_actions[i].port); behaviors[j] = task->exc_actions[i].behavior; flavors[j] = task->exc_actions[i].flavor; - count++; + ++count; if (count > *CountCnt) { break; } } } - }/* for */ + } itk_unlock(task); *CountCnt = count; + return KERN_SUCCESS; -}/* task_get_exception_ports */ +}