X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/3e170ce000f1506b7b5d2c5c7faec85ceabb573d..94ff46dc2849db4d43eaaf144872decc522aafb4:/osfmk/kern/ipc_tt.c diff --git a/osfmk/kern/ipc_tt.c b/osfmk/kern/ipc_tt.c index 9a43453bd..8af9d9cb2 100644 --- a/osfmk/kern/ipc_tt.c +++ b/osfmk/kern/ipc_tt.c @@ -2,7 +2,7 @@ * Copyright (c) 2000-2010 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ - * + * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in @@ -11,10 +11,10 @@ * 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, @@ -22,34 +22,34 @@ * 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@ */ /* * @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. */ @@ -98,9 +98,16 @@ #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 @@ -115,8 +122,8 @@ task_t convert_port_to_locked_task(ipc_port_t port); void ipc_task_init( - task_t task, - task_t parent) + task_t task, + task_t parent) { ipc_space_t space; ipc_port_t kport; @@ -126,34 +133,57 @@ ipc_task_init( 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) + if (nport == IP_NULL) { panic("ipc_task_init"); + } itk_lock_init(task); task->itk_self = kport; task->itk_nself = nport; task->itk_resume = IP_NULL; /* Lazily allocated on-demand */ - task->itk_sself = ipc_port_make_send(kport); + 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; +#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 */ - + kr = host_get_host_port(host_priv_self(), &port); assert(kr == KERN_SUCCESS); task->itk_host = port; @@ -163,44 +193,49 @@ ipc_task_init( task->itk_gssd = IP_NULL; task->itk_task_access = IP_NULL; - for (i = 0; i < TASK_PORT_REGISTER_MAX; i++) + 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].privileged = - parent->exc_actions[i].privileged; + 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); + ipc_port_copy_send(parent->itk_seatbelt); task->itk_gssd = - ipc_port_copy_send(parent->itk_gssd); + ipc_port_copy_send(parent->itk_gssd); task->itk_task_access = - ipc_port_copy_send(parent->itk_task_access); + ipc_port_copy_send(parent->itk_task_access); itk_unlock(parent); } @@ -216,18 +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) + if (nport != IP_NULL) { ipc_kobject_set(nport, (ipc_kobject_t) task, IKOT_TASK_NAME); + } itk_unlock(task); } @@ -241,7 +278,7 @@ ipc_task_enable( void ipc_task_disable( - task_t task) + task_t task) { ipc_port_t kport; ipc_port_t nport; @@ -249,11 +286,13 @@ ipc_task_disable( 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) + if (nport != IP_NULL) { ipc_kobject_set(nport, IKO_NULL, IKOT_NONE); + } rport = task->itk_resume; if (rport != IP_NULL) { @@ -263,7 +302,7 @@ ipc_task_disable( * * 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 + * 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 @@ -285,11 +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; + ipc_port_t rport; int i; itk_lock(task); @@ -313,42 +352,55 @@ ipc_task_terminate( /* 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); } +#if CONFIG_MACF + mac_exc_free_action_label(task->exc_actions + i); +#endif } - if (IP_VALID(task->itk_host)) + 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)) + if (IP_VALID(task->itk_seatbelt)) { ipc_port_release_send(task->itk_seatbelt); - - if (IP_VALID(task->itk_gssd)) + } + + if (IP_VALID(task->itk_gssd)) { ipc_port_release_send(task->itk_gssd); + } - if (IP_VALID(task->itk_task_access)) + if (IP_VALID(task->itk_task_access)) { ipc_port_release_send(task->itk_task_access); + } - if (IP_VALID(task->itk_debug_control)) + 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])) + 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); + if (rport != IP_NULL) { + ipc_port_dealloc_kernel(rport); + } itk_lock_destroy(task); } @@ -367,16 +419,20 @@ ipc_task_terminate( void ipc_task_reset( - task_t task) + 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; - new_kport = ipc_port_alloc_kernel(); - if (new_kport == IP_NULL) - panic("ipc_task_reset"); +#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); @@ -385,15 +441,22 @@ ipc_task_reset( 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; } - task->itk_self = new_kport; old_sself = task->itk_sself; - task->itk_sself = ipc_port_make_send(new_kport); - ipc_kobject_set(old_kport, IKO_NULL, IKOT_NONE); - ipc_kobject_set(new_kport, (ipc_kobject_t) task, IKOT_TASK); + task->itk_sself = task->itk_self = new_kport; + + /* 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; @@ -403,22 +466,30 @@ ipc_task_reset( } 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)) + 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])) { @@ -440,20 +511,17 @@ ipc_task_reset( void ipc_thread_init( - thread_t thread) + thread_t thread) { - ipc_port_t kport; + ipc_port_t kport; - kport = ipc_port_alloc_kernel(); - if (kport == IP_NULL) - panic("ipc_thread_init"); + kport = ipc_kobject_alloc_port((ipc_kobject_t)thread, IKOT_THREAD, + IPC_KOBJECT_ALLOC_MAKE_SEND); - thread->ith_self = kport; - thread->ith_sself = ipc_port_make_send(kport); + thread->ith_sself = thread->ith_self = kport; + thread->ith_special_reply_port = NULL; thread->exc_actions = NULL; - ipc_kobject_set(kport, (ipc_kobject_t)thread, IKOT_THREAD); - #if IMPORTANCE_INHERITANCE thread->ith_assertions = 0; #endif @@ -465,33 +533,51 @@ ipc_thread_init( void ipc_thread_init_exc_actions( - thread_t thread) + 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_destroy_exc_actions( - thread_t thread) + thread_t thread) { if (thread->exc_actions != NULL) { - kfree(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_free_action_label(thread->exc_actions + i); + } +#endif + + kfree(thread->exc_actions, + sizeof(struct exception_action) * EXC_TYPES_COUNT); thread->exc_actions = NULL; } } void ipc_thread_disable( - thread_t thread) + thread_t thread) { - ipc_port_t kport = thread->ith_self; + ipc_port_t kport = thread->ith_self; - if (kport != IP_NULL) + 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); + } } /* @@ -504,22 +590,24 @@ ipc_thread_disable( void ipc_thread_terminate( - thread_t thread) + thread_t thread) { - ipc_port_t kport = thread->ith_self; + ipc_port_t kport = thread->ith_self; if (kport != IP_NULL) { - int i; + int i; - if (IP_VALID(thread->ith_sself)) + if (IP_VALID(thread->ith_sself)) { ipc_port_release_send(thread->ith_sself); + } thread->ith_sself = thread->ith_self = IP_NULL; if (thread->exc_actions != NULL) { for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; ++i) { - if (IP_VALID(thread->exc_actions[i].port)) + if (IP_VALID(thread->exc_actions[i].port)) { ipc_port_release_send(thread->exc_actions[i].port); + } } ipc_thread_destroy_exc_actions(thread); } @@ -533,8 +621,9 @@ ipc_thread_terminate( assert(ipc_kmsg_queue_empty(&thread->ith_messages)); - if (thread->ith_rpc_reply != IP_NULL) + if (thread->ith_rpc_reply != IP_NULL) { ipc_port_dealloc_reply(thread->ith_rpc_reply); + } thread->ith_rpc_reply = IP_NULL; } @@ -544,7 +633,7 @@ ipc_thread_terminate( * 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 + * 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: @@ -553,40 +642,45 @@ ipc_thread_terminate( void ipc_thread_reset( - thread_t thread) + thread_t thread) { 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; + boolean_t has_old_exc_actions = FALSE; + int i; + +#if CONFIG_MACF + struct label *new_label = mac_exc_create_label(); +#endif - new_kport = ipc_port_alloc_kernel(); - if (new_kport == IP_NULL) - panic("ipc_task_reset"); + 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; } - thread->ith_self = new_kport; - old_sself = thread->ith_sself; - thread->ith_sself = ipc_port_make_send(new_kport); + thread->ith_sself = thread->ith_self = new_kport; if (old_kport != IP_NULL) { ipc_kobject_set(old_kport, IKO_NULL, IKOT_NONE); } - ipc_kobject_set(new_kport, (ipc_kobject_t) thread, IKOT_THREAD); /* * Only ports that were set by root-owned processes - * (privileged ports) should survive + * (privileged ports) should survive */ if (thread->exc_actions != NULL) { has_old_exc_actions = TRUE; @@ -594,18 +688,26 @@ ipc_thread_reset( 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; + thread->exc_actions[i].port = IP_NULL; } } } thread_mtx_unlock(thread); +#if CONFIG_MACF + mac_exc_free_label(new_label); +#endif + /* release the naked send rights */ - if (IP_VALID(old_sself)) + 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++) { @@ -617,6 +719,11 @@ ipc_thread_reset( 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); + } } /* @@ -633,9 +740,10 @@ ipc_thread_reset( 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()); @@ -644,14 +752,11 @@ 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; @@ -671,9 +776,10 @@ retrieve_task_self_fast( ipc_port_t retrieve_thread_self_fast( - thread_t thread) + thread_t thread) { - register ipc_port_t port; + __assert_only ipc_port_t sright; + ipc_port_t port; assert(thread == current_thread()); @@ -683,15 +789,11 @@ retrieve_thread_self_fast( if ((port = thread->ith_sself) == thread->ith_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); + } thread_mtx_unlock(thread); @@ -745,7 +847,6 @@ thread_self_trap( sright = retrieve_thread_self_fast(thread); name = ipc_port_copyout_send(sright, task->itk_space); return name; - } /* @@ -767,14 +868,118 @@ mach_reply_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 { + name = MACH_PORT_NULL; + } + return name; +} + +/* + * Routine: thread_get_special_reply_port [mach trap] + * Purpose: + * Allocate a special reply port for the calling thread. + * Conditions: + * Nothing locked. + * Returns: + * mach_port_name_t: send right & receive right for special reply port. + * MACH_PORT_NULL if there are any resource failures + * or other errors. + */ + +mach_port_name_t +thread_get_special_reply_port( + __unused struct thread_get_special_reply_port_args *args) +{ + 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; + } + } + + 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 + } else { name = MACH_PORT_NULL; + } return name; } +/* + * 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. + */ + +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); + + 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: @@ -791,36 +996,37 @@ mach_reply_port( kern_return_t thread_get_special_port( - thread_t thread, - int which, - ipc_port_t *portp) + thread_t thread, + int which, + ipc_port_t *portp) { - kern_return_t result = KERN_SUCCESS; - ipc_port_t *whichp; + kern_return_t result = KERN_SUCCESS; + ipc_port_t *whichp; - if (thread == THREAD_NULL) - return (KERN_INVALID_ARGUMENT); + if (thread == THREAD_NULL) { + return KERN_INVALID_ARGUMENT; + } switch (which) { - case THREAD_KERNEL_PORT: whichp = &thread->ith_sself; break; default: - return (KERN_INVALID_ARGUMENT); + return KERN_INVALID_ARGUMENT; } - thread_mtx_lock(thread); + thread_mtx_lock(thread); - if (thread->active) + if (thread->active) { *portp = ipc_port_copy_send(*whichp); - else + } else { result = KERN_FAILURE; + } thread_mtx_unlock(thread); - return (result); + return result; } /* @@ -840,24 +1046,24 @@ thread_get_special_port( kern_return_t thread_set_special_port( - thread_t thread, - int which, - ipc_port_t port) + thread_t thread, + int which, + ipc_port_t port) { - kern_return_t result = KERN_SUCCESS; - ipc_port_t *whichp, old = IP_NULL; + kern_return_t result = KERN_SUCCESS; + ipc_port_t *whichp, old = IP_NULL; - if (thread == THREAD_NULL) - return (KERN_INVALID_ARGUMENT); + if (thread == THREAD_NULL) { + return KERN_INVALID_ARGUMENT; + } switch (which) { - case THREAD_KERNEL_PORT: whichp = &thread->ith_sself; break; default: - return (KERN_INVALID_ARGUMENT); + return KERN_INVALID_ARGUMENT; } thread_mtx_lock(thread); @@ -865,16 +1071,17 @@ thread_set_special_port( if (thread->active) { old = *whichp; *whichp = port; - } - else + } else { result = KERN_FAILURE; + } thread_mtx_unlock(thread); - if (IP_VALID(old)) + if (IP_VALID(old)) { ipc_port_release_send(old); + } - return (result); + return result; } /* @@ -893,14 +1100,15 @@ thread_set_special_port( kern_return_t task_get_special_port( - task_t task, - int which, - ipc_port_t *portp) + task_t task, + int which, + ipc_port_t *portp) { ipc_port_t port; - if (task == TASK_NULL) + if (task == TASK_NULL) { return KERN_INVALID_ARGUMENT; + } itk_lock(task); if (task->itk_self == IP_NULL) { @@ -909,36 +1117,36 @@ task_get_special_port( } switch (which) { - case TASK_KERNEL_PORT: + case TASK_KERNEL_PORT: port = ipc_port_copy_send(task->itk_sself); break; - case TASK_NAME_PORT: + case TASK_NAME_PORT: port = ipc_port_make_send(task->itk_nself); break; - case TASK_HOST_PORT: + case TASK_HOST_PORT: port = ipc_port_copy_send(task->itk_host); break; - case TASK_BOOTSTRAP_PORT: + case TASK_BOOTSTRAP_PORT: port = ipc_port_copy_send(task->itk_bootstrap); break; - case TASK_SEATBELT_PORT: + case TASK_SEATBELT_PORT: port = ipc_port_copy_send(task->itk_seatbelt); break; - case TASK_ACCESS_PORT: + case TASK_ACCESS_PORT: port = ipc_port_copy_send(task->itk_task_access); break; - case TASK_DEBUG_CONTROL_PORT: + case TASK_DEBUG_CONTROL_PORT: port = ipc_port_copy_send(task->itk_debug_control); break; - default: - itk_unlock(task); + default: + itk_unlock(task); return KERN_INVALID_ARGUMENT; } itk_unlock(task); @@ -960,48 +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_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_SEATBELT_PORT: + case TASK_SEATBELT_PORT: whichp = &task->itk_seatbelt; break; - case TASK_ACCESS_PORT: + case TASK_ACCESS_PORT: whichp = &task->itk_task_access; break; - - case TASK_DEBUG_CONTROL_PORT: + + case TASK_DEBUG_CONTROL_PORT: whichp = &task->itk_debug_control; break; - - default: + default: return KERN_INVALID_ARGUMENT; }/* switch */ @@ -1012,18 +1224,19 @@ task_set_special_port( } /* 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; + 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; } @@ -1050,26 +1263,29 @@ task_set_special_port( 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]; unsigned int i; if ((task == TASK_NULL) || (portsCnt > TASK_PORT_REGISTER_MAX) || - (portsCnt && memory == NULL)) + (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) { @@ -1092,18 +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) + if (portsCnt != 0) { kfree(memory, - (vm_size_t) (portsCnt * sizeof(mach_port_t))); + (vm_size_t) (portsCnt * sizeof(mach_port_t))); + } return KERN_SUCCESS; } @@ -1124,23 +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) { void *memory; vm_size_t size; ipc_port_t *ports; int i; - 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) { @@ -1157,8 +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); @@ -1167,6 +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: @@ -1179,9 +1449,10 @@ mach_ports_lookup( task_t convert_port_to_locked_task(ipc_port_t port) { - int try_failed_count = 0; + int try_failed_count = 0; while (IP_VALID(port)) { + task_t ct = current_task(); task_t task; ip_lock(port); @@ -1192,13 +1463,18 @@ 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++; @@ -1209,58 +1485,139 @@ convert_port_to_locked_task(ipc_port_t port) } /* - * Routine: convert_port_to_task + * Routine: convert_port_to_locked_task_inspect * Purpose: - * Convert from a port to a task. - * Doesn't consume the port ref; produces a task ref, - * which may be null. + * 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. + * Nothing locked, blocking OK. */ -task_t -convert_port_to_task( - ipc_port_t port) +task_inspect_t +convert_port_to_locked_task_inspect(ipc_port_t port) { - task_t task = TASK_NULL; - - if (IP_VALID(port)) { - ip_lock(port); + int try_failed_count = 0; - if ( ip_active(port) && - ip_kotype(port) == IKOT_TASK ) { - task = (task_t)port->ip_kobject; - assert(task != TASK_NULL); + while (IP_VALID(port)) { + task_inspect_t task; - task_reference_internal(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); + return TASK_INSPECT_NULL; } -/* - * 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. - */ +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: + * Convert from a port to a task. + * Doesn't consume the port ref; produces a task ref, + * which may be null. + * Conditions: + * Nothing locked. + */ +task_t +convert_port_to_task( + ipc_port_t port) +{ + return convert_port_to_task_with_exec_token(port, NULL); +} + + +/* + * 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) + ipc_port_t port) { - task_name_t task = TASK_NULL; + 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)) { + 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); @@ -1270,7 +1627,52 @@ convert_port_to_task_name( ip_unlock(port); } - return (task); + 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; } /* @@ -1284,15 +1686,15 @@ convert_port_to_task_name( */ task_suspension_token_t convert_port_to_task_suspension_token( - ipc_port_t port) + ipc_port_t port) { - task_suspension_token_t task = TASK_NULL; + task_suspension_token_t task = TASK_NULL; if (IP_VALID(port)) { ip_lock(port); - if ( ip_active(port) && - ip_kotype(port) == IKOT_TASK_RESUME) { + if (ip_active(port) && + ip_kotype(port) == IKOT_TASK_RESUME) { task = (task_suspension_token_t)port->ip_kobject; assert(task != TASK_NULL); @@ -1302,7 +1704,7 @@ convert_port_to_task_suspension_token( ip_unlock(port); } - return (task); + return task; } /* @@ -1316,25 +1718,59 @@ convert_port_to_task_suspension_token( */ 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; +} + +/* + * 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) +{ + ipc_space_inspect_t space; + task_inspect_t task; + + task = convert_port_to_locked_task_inspect(port); + + if (task == TASK_INSPECT_NULL) { + return IPC_SPACE_INSPECT_NULL; + } + + 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; } /* @@ -1349,21 +1785,22 @@ convert_port_to_space( vm_map_t convert_port_to_map( - ipc_port_t port) + ipc_port_t port) { task_t task; vm_map_t map; task = convert_port_to_locked_task(port); - - if (task == TASK_NULL) + + 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); task_unlock(task); @@ -1381,29 +1818,109 @@ convert_port_to_map( * Nothing locked. */ +static thread_t +convert_port_to_thread_locked( + ipc_port_t port, + port_to_thread_options_t options) +{ + 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; + } + } + + 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 thread; +} + thread_t convert_port_to_thread( - ipc_port_t port) + ipc_port_t port) { - thread_t thread = THREAD_NULL; + 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); + } - if ( ip_active(port) && - ip_kotype(port) == IKOT_THREAD ) { - thread = (thread_t)port->ip_kobject; - assert(thread != THREAD_NULL); + return thread; +} - thread_reference_internal(thread); - } +/* + * Routine: convert_port_to_thread_inspect + * Purpose: + * 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; + + 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); + 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) +{ + thread_deallocate(thread); + return IP_NULL; } + /* * Routine: port_name_to_thread * Purpose: @@ -1411,53 +1928,87 @@ convert_port_to_thread( * A name of MACH_PORT_NULL is valid for the null thread. * Conditions: * Nothing locked. - * - * TODO: Could this be faster if it were ipc_port_translate_send based, like thread_switch? - * We could avoid extra lock/unlock and extra ref operations on the port. */ thread_t port_name_to_thread( - mach_port_name_t name) + mach_port_name_t name, + port_to_thread_options_t options) { - thread_t thread = THREAD_NULL; - ipc_port_t kport; + thread_t thread = THREAD_NULL; + ipc_port_t kport; + kern_return_t kr; if (MACH_PORT_VALID(name)) { - if (ipc_object_copyin(current_space(), name, - MACH_MSG_TYPE_COPY_SEND, - (ipc_object_t *)&kport) != KERN_SUCCESS) - return (THREAD_NULL); - - thread = convert_port_to_thread(kport); - - if (IP_VALID(kport)) - ipc_port_release_send(kport); + kr = ipc_port_translate_send(current_space(), name, &kport); + if (kr == KERN_SUCCESS) { + thread = convert_port_to_thread_locked(kport, options); + ip_unlock(kport); + } } - return (thread); + return thread; } task_t port_name_to_task( mach_port_name_t name) { - ipc_port_t kern_port; + ipc_port_t kport; 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; + 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; - task = convert_port_to_task(kern_port); + 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; +} - if (IP_VALID(kern_port)) - ipc_port_release_send(kern_port); +/* + * Routine: port_name_to_host + * Purpose: + * Convert from a port name to a host pointer. + * NOTE: This does _not_ return a +1 reference to the host_t + * Conditions: + * Nothing locked. + */ +host_t +port_name_to_host( + mach_port_name_t name) +{ + host_t host = HOST_NULL; + kern_return_t kr; + ipc_port_t port; + + 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 task; + return host; } /* @@ -1465,52 +2016,70 @@ port_name_to_task( * Purpose: * Convert from a task to a port. * Consumes a task ref; produces a naked send right - * which may be invalid. + * which may be invalid. * Conditions: * Nothing locked. */ ipc_port_t convert_task_to_port( - task_t task) + task_t task) { ipc_port_t port; itk_lock(task); - if (task->itk_self != IP_NULL) + + if (task->itk_self != IP_NULL) { port = ipc_port_make_send(task->itk_self); - else + } else { port = IP_NULL; + } + itk_unlock(task); task_deallocate(task); return port; } +/* + * Routine: convert_task_inspect_to_port + * Purpose: + * 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. + */ +ipc_port_t +convert_task_inspect_to_port( + task_inspect_t task) +{ + task_deallocate(task); + + return IP_NULL; +} + /* * 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. + * which may be invalid. * Conditions: * Nothing locked. */ ipc_port_t convert_task_suspension_token_to_port( - task_suspension_token_t task) + task_suspension_token_t task) { ipc_port_t port; task_lock(task); if (task->active) { if (task->itk_resume == IP_NULL) { - task->itk_resume = ipc_port_alloc_kernel(); - if (!IP_VALID(task->itk_resume)) { - panic("failed to create resume port"); - } - - ipc_kobject_set(task->itk_resume, (ipc_kobject_t) task, IKOT_TASK_RESUME); + task->itk_resume = ipc_kobject_alloc_port((ipc_kobject_t) task, + IKOT_TASK_RESUME, IPC_KOBJECT_ALLOC_NONE); } /* @@ -1536,22 +2105,23 @@ convert_task_suspension_token_to_port( * Purpose: * Convert from a task name ref to a port. * Consumes a task name ref; produces a naked send right - * which may be invalid. + * which may be invalid. * Conditions: * Nothing locked. */ ipc_port_t convert_task_name_to_port( - task_name_t task_name) + task_name_t task_name) { ipc_port_t port; itk_lock(task_name); - if (task_name->itk_nself != IP_NULL) + if (task_name->itk_nself != IP_NULL) { port = ipc_port_make_send(task_name->itk_nself); - else + } else { port = IP_NULL; + } itk_unlock(task_name); task_name_deallocate(task_name); @@ -1570,22 +2140,23 @@ convert_task_name_to_port( ipc_port_t convert_thread_to_port( - thread_t thread) + thread_t thread) { - ipc_port_t port; + ipc_port_t port; thread_mtx_lock(thread); - if (thread->ith_self != IP_NULL) + if (thread->ith_self != IP_NULL) { port = ipc_port_make_send(thread->ith_self); - else + } else { port = IP_NULL; + } thread_mtx_unlock(thread); thread_deallocate(thread); - return (port); + return port; } /* @@ -1598,10 +2169,28 @@ convert_thread_to_port( 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); + } } /* @@ -1624,106 +2213,132 @@ space_deallocate( kern_return_t thread_set_exception_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) + thread_t thread, + exception_mask_t exception_mask, + ipc_port_t new_port, + exception_behavior_t new_behavior, + thread_state_flavor_t new_flavor) { - 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; + register int i; + +#if CONFIG_MACF + struct label *new_label; +#endif - if (thread == THREAD_NULL) - return (KERN_INVALID_ARGUMENT); + if (thread == THREAD_NULL) { + return KERN_INVALID_ARGUMENT; + } - if (exception_mask & ~EXC_MASK_VALID) - return (KERN_INVALID_ARGUMENT); + if (exception_mask & ~EXC_MASK_VALID) { + return KERN_INVALID_ARGUMENT; + } if (IP_VALID(new_port)) { - switch (new_behavior & ~MACH_EXCEPTION_CODES) { - + switch (new_behavior & ~MACH_EXCEPTION_MASK) { case EXCEPTION_DEFAULT: case EXCEPTION_STATE: case EXCEPTION_STATE_IDENTITY: break; default: - return (KERN_INVALID_ARGUMENT); + 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 (new_flavor != 0 && !VALID_THREAD_STATE_FLAVOR(new_flavor)) - return (KERN_INVALID_ARGUMENT); + 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); + return KERN_FAILURE; } 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 ((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 + } else { old_port[i] = IP_NULL; + } } thread_mtx_unlock(thread); - 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 + + 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); + 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) { - 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; + register int i; - if (task == TASK_NULL) - return (KERN_INVALID_ARGUMENT); +#if CONFIG_MACF + struct label *new_label; +#endif - if (exception_mask & ~EXC_MASK_VALID) - return (KERN_INVALID_ARGUMENT); + if (task == TASK_NULL) { + return KERN_INVALID_ARGUMENT; + } - if (IP_VALID(new_port)) { - switch (new_behavior & ~MACH_EXCEPTION_CODES) { + if (exception_mask & ~EXC_MASK_VALID) { + return KERN_INVALID_ARGUMENT; + } + if (IP_VALID(new_port)) { + switch (new_behavior & ~MACH_EXCEPTION_MASK) { case EXCEPTION_DEFAULT: case EXCEPTION_STATE: case EXCEPTION_STATE_IDENTITY: break; default: - return (KERN_INVALID_ARGUMENT); + return KERN_INVALID_ARGUMENT; } } @@ -1732,40 +2347,56 @@ task_set_exception_ports( * 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 (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); + return KERN_FAILURE; } for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; ++i) { - if (exception_mask & (1 << 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; task->exc_actions[i].privileged = privileged; - } - else + } else { old_port[i] = IP_NULL; + } } 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 + + 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); + return KERN_SUCCESS; } /* @@ -1797,49 +2428,59 @@ task_set_exception_ports( kern_return_t thread_swap_exception_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_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) { - 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; + unsigned int i, j, count; - if (thread == THREAD_NULL) - return (KERN_INVALID_ARGUMENT); +#if CONFIG_MACF + struct label *new_label; +#endif - if (exception_mask & ~EXC_MASK_VALID) - return (KERN_INVALID_ARGUMENT); + if (thread == THREAD_NULL) { + return KERN_INVALID_ARGUMENT; + } - if (IP_VALID(new_port)) { - switch (new_behavior & ~MACH_EXCEPTION_CODES) { + if (exception_mask & ~EXC_MASK_VALID) { + return KERN_INVALID_ARGUMENT; + } + if (IP_VALID(new_port)) { + switch (new_behavior & ~MACH_EXCEPTION_MASK) { case EXCEPTION_DEFAULT: case EXCEPTION_STATE: case EXCEPTION_STATE_IDENTITY: break; default: - return (KERN_INVALID_ARGUMENT); + return KERN_INVALID_ARGUMENT; } } - if (new_flavor != 0 && !VALID_THREAD_STATE_FLAVOR(new_flavor)) - return (KERN_INVALID_ARGUMENT); + 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); + return KERN_FAILURE; } if (thread->exc_actions == NULL) { @@ -1848,15 +2489,19 @@ thread_swap_exception_ports( 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 ((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] ) { + 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; } @@ -1876,84 +2521,104 @@ thread_swap_exception_ports( thread->exc_actions[i].behavior = new_behavior; thread->exc_actions[i].flavor = new_flavor; thread->exc_actions[i].privileged = privileged; - } - else + } else { old_port[i] = IP_NULL; + } } thread_mtx_unlock(thread); +#if CONFIG_MACF + mac_exc_free_label(new_label); +#endif + while (--i >= FIRST_EXCEPTION) { - if (IP_VALID(old_port[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); + } *CountCnt = count; - return (KERN_SUCCESS); + return KERN_SUCCESS; } 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, - exception_behavior_array_t behaviors, - thread_state_flavor_array_t flavors) + 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) { - 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; + unsigned int i, j, count; - if (task == TASK_NULL) - return (KERN_INVALID_ARGUMENT); +#if CONFIG_MACF + struct label *new_label; +#endif - if (exception_mask & ~EXC_MASK_VALID) - return (KERN_INVALID_ARGUMENT); + if (task == TASK_NULL) { + return KERN_INVALID_ARGUMENT; + } - if (IP_VALID(new_port)) { - switch (new_behavior & ~MACH_EXCEPTION_CODES) { + if (exception_mask & ~EXC_MASK_VALID) { + return KERN_INVALID_ARGUMENT; + } + if (IP_VALID(new_port)) { + switch (new_behavior & ~MACH_EXCEPTION_MASK) { case EXCEPTION_DEFAULT: case EXCEPTION_STATE: case EXCEPTION_STATE_IDENTITY: break; default: - return (KERN_INVALID_ARGUMENT); + return KERN_INVALID_ARGUMENT; } } - if (new_flavor != 0 && !VALID_THREAD_STATE_FLAVOR(new_flavor)) - return (KERN_INVALID_ARGUMENT); + 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); + return KERN_FAILURE; } 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 ((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. */ - if ( task->exc_actions[i].port == ports[j] && - task->exc_actions[i].behavior == behaviors[j] && - task->exc_actions[i].flavor == flavors[j] ) { + if (task->exc_actions[i].port == ports[j] && + task->exc_actions[i].behavior == behaviors[j] && + task->exc_actions[i].flavor == flavors[j]) { masks[j] |= (1 << i); break; } @@ -1969,28 +2634,34 @@ task_swap_exception_ports( 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; task->exc_actions[i].privileged = privileged; - } - else + } else { old_port[i] = IP_NULL; + } } itk_unlock(task); +#if CONFIG_MACF + mac_exc_free_label(new_label); +#endif + while (--i >= FIRST_EXCEPTION) { - if (IP_VALID(old_port[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); + } *CountCnt = count; - return (KERN_SUCCESS); + return KERN_SUCCESS; } /* @@ -2014,28 +2685,30 @@ task_swap_exception_ports( kern_return_t thread_get_exception_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_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) { - unsigned int i, j, count; + unsigned int i, j, count; - if (thread == THREAD_NULL) - return (KERN_INVALID_ARGUMENT); + if (thread == THREAD_NULL) { + return KERN_INVALID_ARGUMENT; + } - if (exception_mask & ~EXC_MASK_VALID) - return (KERN_INVALID_ARGUMENT); + if (exception_mask & ~EXC_MASK_VALID) { + return KERN_INVALID_ARGUMENT; + } thread_mtx_lock(thread); if (!thread->active) { thread_mtx_unlock(thread); - return (KERN_FAILURE); + return KERN_FAILURE; } count = 0; @@ -2051,9 +2724,9 @@ thread_get_exception_ports( * 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] ) { + 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; } @@ -2065,8 +2738,9 @@ thread_get_exception_ports( behaviors[j] = thread->exc_actions[i].behavior; flavors[j] = thread->exc_actions[i].flavor; ++count; - if (count >= *CountCnt) + if (count >= *CountCnt) { break; + } } } } @@ -2076,33 +2750,35 @@ done: *CountCnt = count; - return (KERN_SUCCESS); + return KERN_SUCCESS; } 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, - exception_behavior_array_t behaviors, - thread_state_flavor_array_t flavors) + 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) { - unsigned int i, j, count; + unsigned int i, j, count; - if (task == TASK_NULL) - return (KERN_INVALID_ARGUMENT); + if (task == TASK_NULL) { + return KERN_INVALID_ARGUMENT; + } - if (exception_mask & ~EXC_MASK_VALID) - return (KERN_INVALID_ARGUMENT); + 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); + return KERN_FAILURE; } count = 0; @@ -2114,9 +2790,9 @@ task_get_exception_ports( * 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] ) { + if (task->exc_actions[i].port == ports[j] && + task->exc_actions[i].behavior == behaviors[j] && + task->exc_actions[i].flavor == flavors[j]) { masks[j] |= (1 << i); break; } @@ -2128,8 +2804,9 @@ task_get_exception_ports( behaviors[j] = task->exc_actions[i].behavior; flavors[j] = task->exc_actions[i].flavor; ++count; - if (count > *CountCnt) + if (count > *CountCnt) { break; + } } } } @@ -2138,5 +2815,5 @@ task_get_exception_ports( *CountCnt = count; - return (KERN_SUCCESS); + return KERN_SUCCESS; }