X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/378393581903b274cb7a4d18e0d978071a6b592d..4a3eedf9ecc9bbe3f3a5c6ce5e53ad199d639d32:/osfmk/kern/ipc_tt.c diff --git a/osfmk/kern/ipc_tt.c b/osfmk/kern/ipc_tt.c index 3af0f19c5..e14a6fe85 100644 --- a/osfmk/kern/ipc_tt.c +++ b/osfmk/kern/ipc_tt.c @@ -1,23 +1,29 @@ /* - * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2007 Apple Inc. All rights reserved. * - * @APPLE_LICENSE_HEADER_START@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * - * The contents of this file constitute Original Code as defined in and - * are subject to the Apple Public Source License Version 1.1 (the - * "License"). You may not use this file except in compliance with the - * License. Please obtain a copy of the License at - * http://www.apple.com/publicsource and read it before using this file. + * This file contains Original Code and/or Modifications of Original Code + * as defined in and that are subject to the Apple Public Source License + * Version 2.0 (the 'License'). You may not use this file except in + * compliance with the License. The rights granted to you under the License + * may not be used to create, or enable the creation or redistribution of, + * unlawful or unlicensed copies of an Apple operating system, or to + * circumvent, violate, or enable the circumvention or violation of, any + * terms of an Apple operating system software license agreement. * - * This Original Code and all software distributed under the License are - * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER + * Please obtain a copy of the License at + * http://www.opensource.apple.com/apsl/ and read it before using this file. + * + * The Original Code and all software distributed under the License are + * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the - * License for the specific language governing rights and limitations - * under the License. + * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. + * Please see the License for the specific language governing rights and + * limitations under the License. * - * @APPLE_LICENSE_HEADER_END@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * @OSF_COPYRIGHT@ @@ -47,6 +53,12 @@ * 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. + */ /* */ @@ -82,9 +94,10 @@ #include #include -#include #include +#include + /* forward declarations */ task_t convert_port_to_locked_task(ipc_port_t port); @@ -107,6 +120,7 @@ ipc_task_init( { ipc_space_t space; ipc_port_t kport; + ipc_port_t nport; kern_return_t kr; int i; @@ -115,17 +129,31 @@ ipc_task_init( if (kr != KERN_SUCCESS) panic("ipc_task_init"); + space->is_task = task; kport = ipc_port_alloc_kernel(); 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_nself = nport; task->itk_sself = ipc_port_make_send(kport); task->itk_space = space; space->is_fast = FALSE; +#if CONFIG_MACF_MACH + if (parent) + mac_task_label_associate(parent, task, &parent->maclabel, + &task->maclabel, &kport->ip_label); + else + mac_task_label_associate_kernel(task, &task->maclabel, &kport->ip_label); +#endif + if (parent == TASK_NULL) { ipc_port_t port; @@ -138,6 +166,10 @@ ipc_task_init( task->itk_host = port; task->itk_bootstrap = IP_NULL; + task->itk_seatbelt = IP_NULL; + task->itk_gssd = IP_NULL; + task->itk_automountd = IP_NULL; + task->itk_task_access = IP_NULL; for (i = 0; i < TASK_PORT_REGISTER_MAX; i++) task->itk_registered[i] = IP_NULL; @@ -160,6 +192,8 @@ ipc_task_init( 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; }/* for */ task->itk_host = ipc_port_copy_send(parent->itk_host); @@ -167,6 +201,18 @@ ipc_task_init( task->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_automountd = + ipc_port_copy_send(parent->itk_automountd); + + task->itk_task_access = + ipc_port_copy_send(parent->itk_task_access); + itk_unlock(parent); } } @@ -184,11 +230,15 @@ ipc_task_enable( task_t task) { ipc_port_t kport; + ipc_port_t nport; itk_lock(task); kport = task->itk_self; 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); } @@ -205,11 +255,15 @@ ipc_task_disable( task_t task) { ipc_port_t kport; + ipc_port_t nport; itk_lock(task); kport = task->itk_self; 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); itk_unlock(task); } @@ -227,6 +281,7 @@ ipc_task_terminate( task_t task) { ipc_port_t kport; + ipc_port_t nport; int i; itk_lock(task); @@ -237,8 +292,12 @@ 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; + itk_unlock(task); /* release the naked send rights */ @@ -258,6 +317,18 @@ ipc_task_terminate( 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_automountd)) + ipc_port_release_send(task->itk_automountd); + + 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])) ipc_port_release_send(task->itk_registered[i]); @@ -265,15 +336,18 @@ ipc_task_terminate( ipc_port_release_send(task->wired_ledger_port); ipc_port_release_send(task->paged_ledger_port); - /* destroy the kernel port */ + /* destroy the kernel ports */ ipc_port_dealloc_kernel(kport); + ipc_port_dealloc_kernel(nport); } /* * Routine: ipc_task_reset * Purpose: * Reset a task's IPC state to protect it when - * it enters an elevated security context. + * 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.) @@ -285,10 +359,8 @@ ipc_task_reset( { ipc_port_t old_kport, new_kport; ipc_port_t old_sself; -#if 0 ipc_port_t old_exc_actions[EXC_TYPES_COUNT]; int i; -#endif new_kport = ipc_port_alloc_kernel(); if (new_kport == IP_NULL) @@ -311,12 +383,14 @@ ipc_task_reset( ipc_kobject_set(old_kport, IKO_NULL, IKOT_NONE); ipc_kobject_set(new_kport, (ipc_kobject_t) task, IKOT_TASK); -#if 0 for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; i++) { - old_exc_actions[i] = task->exc_action[i].port; - task->exc_actions[i].port = IP_NULL; + if (!task->exc_actions[i].privileged) { + old_exc_actions[i] = task->exc_actions[i].port; + task->exc_actions[i].port = IP_NULL; + } else { + old_exc_actions[i] = IP_NULL; + } }/* for */ -#endif itk_unlock(task); @@ -325,13 +399,11 @@ ipc_task_reset( if (IP_VALID(old_sself)) ipc_port_release_send(old_sself); -#if 0 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 */ -#endif /* destroy the kernel port */ ipc_port_dealloc_kernel(old_kport); @@ -417,6 +489,74 @@ ipc_thread_terminate( 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_thread_reset( + thread_t thread) +{ + 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"); + + thread_mtx_lock(thread); + + old_kport = thread->ith_self; + + if (old_kport == IP_NULL) { + /* the is already terminated (can this happen?) */ + thread_mtx_unlock(thread); + ipc_port_dealloc_kernel(new_kport); + return; + } + + thread->ith_self = new_kport; + old_sself = thread->ith_sself; + thread->ith_sself = ipc_port_make_send(new_kport); + ipc_kobject_set(old_kport, IKO_NULL, IKOT_NONE); + ipc_kobject_set(new_kport, (ipc_kobject_t) thread, IKOT_THREAD); + + for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; i++) { + if (!thread->exc_actions[i].privileged) { + old_exc_actions[i] = thread->exc_actions[i].port; + thread->exc_actions[i].port = IP_NULL; + } else { + old_exc_actions[i] = IP_NULL; + } + }/* for */ + + thread_mtx_unlock(thread); + + /* 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(old_kport); +} + /* * Routine: retrieve_task_self_fast * Purpose: @@ -695,44 +835,62 @@ task_get_special_port( int which, ipc_port_t *portp) { - ipc_port_t *whichp; ipc_port_t port; if (task == TASK_NULL) return KERN_INVALID_ARGUMENT; + itk_lock(task); + if (task->itk_self == IP_NULL) { + itk_unlock(task); + return KERN_FAILURE; + } + switch (which) { case TASK_KERNEL_PORT: - whichp = &task->itk_sself; + 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: - whichp = &task->itk_host; + port = ipc_port_copy_send(task->itk_host); break; case TASK_BOOTSTRAP_PORT: - whichp = &task->itk_bootstrap; + port = ipc_port_copy_send(task->itk_bootstrap); break; - case TASK_WIRED_LEDGER_PORT: - whichp = &task->wired_ledger_port; - break; + case TASK_WIRED_LEDGER_PORT: + port = ipc_port_copy_send(task->wired_ledger_port); + break; - case TASK_PAGED_LEDGER_PORT: - whichp = &task->paged_ledger_port; - break; + case TASK_PAGED_LEDGER_PORT: + port = ipc_port_copy_send(task->paged_ledger_port); + break; + case TASK_SEATBELT_PORT: + port = ipc_port_copy_send(task->itk_seatbelt); + break; + + case TASK_GSSD_PORT: + port = ipc_port_copy_send(task->itk_gssd); + break; + + case TASK_ACCESS_PORT: + port = ipc_port_copy_send(task->itk_task_access); + break; + + case TASK_AUTOMOUNTD_PORT: + port = ipc_port_copy_send(task->itk_automountd); + break; + default: + itk_unlock(task); return KERN_INVALID_ARGUMENT; } - - itk_lock(task); - if (task->itk_self == IP_NULL) { - itk_unlock(task); - return KERN_FAILURE; - } - - port = ipc_port_copy_send(*whichp); itk_unlock(task); *portp = port; @@ -752,6 +910,7 @@ 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 @@ -779,14 +938,30 @@ task_set_special_port( whichp = &task->itk_bootstrap; break; - case TASK_WIRED_LEDGER_PORT: - whichp = &task->wired_ledger_port; - break; + case TASK_WIRED_LEDGER_PORT: + whichp = &task->wired_ledger_port; + break; - case TASK_PAGED_LEDGER_PORT: - whichp = &task->paged_ledger_port; - break; + case TASK_PAGED_LEDGER_PORT: + whichp = &task->paged_ledger_port; + break; + case TASK_SEATBELT_PORT: + whichp = &task->itk_seatbelt; + break; + + case TASK_GSSD_PORT: + whichp = &task->itk_gssd; + break; + + case TASK_ACCESS_PORT: + whichp = &task->itk_task_access; + break; + + case TASK_AUTOMOUNTD_PORT: + whichp = &task->itk_automountd; + break; + default: return KERN_INVALID_ARGUMENT; }/* switch */ @@ -797,6 +972,20 @@ 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; + } + +#if CONFIG_MACF_MACH + if (mac_task_check_service(current_task(), task, "set_special_port")) { + itk_unlock(task); + return KERN_NO_ACCESS; + } +#endif + old = *whichp; *whichp = port; itk_unlock(task); @@ -956,6 +1145,8 @@ 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 task; @@ -975,9 +1166,10 @@ convert_port_to_locked_task(ipc_port_t port) ip_unlock(port); return(task); } + try_failed_count++; ip_unlock(port); - mutex_pause(); + mutex_pause(try_failed_count); } return TASK_NULL; } @@ -1014,6 +1206,39 @@ convert_port_to_task( return (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); +} + /* * Routine: convert_port_to_space * Purpose: @@ -1193,6 +1418,33 @@ convert_task_to_port( return port; } +/* + * Routine: convert_task_name_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. + * Conditions: + * Nothing locked. + */ + +ipc_port_t +convert_task_name_to_port( + task_name_t task_name) +{ + ipc_port_t port; + + 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_name); + + task_name_deallocate(task_name); + return port; +} + /* * Routine: convert_thread_to_port * Purpose: @@ -1266,6 +1518,7 @@ thread_set_exception_ports( thread_state_flavor_t new_flavor) { ipc_port_t old_port[EXC_TYPES_COUNT]; + boolean_t privileged = current_task()->sec_token.val[0] == 0; register int i; if (thread == THREAD_NULL) @@ -1275,7 +1528,7 @@ thread_set_exception_ports( return (KERN_INVALID_ARGUMENT); if (IP_VALID(new_port)) { - switch (new_behavior) { + switch (new_behavior & ~MACH_EXCEPTION_CODES) { case EXCEPTION_DEFAULT: case EXCEPTION_STATE: @@ -1309,6 +1562,7 @@ thread_set_exception_ports( 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; @@ -1335,6 +1589,7 @@ task_set_exception_ports( thread_state_flavor_t new_flavor) { ipc_port_t old_port[EXC_TYPES_COUNT]; + boolean_t privileged = current_task()->sec_token.val[0] == 0; register int i; if (task == TASK_NULL) @@ -1344,7 +1599,7 @@ task_set_exception_ports( return (KERN_INVALID_ARGUMENT); if (IP_VALID(new_port)) { - switch (new_behavior) { + switch (new_behavior & ~MACH_EXCEPTION_CODES) { case EXCEPTION_DEFAULT: case EXCEPTION_STATE: @@ -1371,6 +1626,7 @@ task_set_exception_ports( 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 old_port[i] = IP_NULL; @@ -1429,6 +1685,7 @@ thread_swap_exception_ports( thread_state_flavor_array_t flavors) { ipc_port_t old_port[EXC_TYPES_COUNT]; + boolean_t privileged = current_task()->sec_token.val[0] == 0; unsigned int i, j, count; if (thread == THREAD_NULL) @@ -1438,7 +1695,7 @@ thread_swap_exception_ports( return (KERN_INVALID_ARGUMENT); if (IP_VALID(new_port)) { - switch (new_behavior) { + switch (new_behavior & ~MACH_EXCEPTION_CODES) { case EXCEPTION_DEFAULT: case EXCEPTION_STATE: @@ -1488,6 +1745,7 @@ thread_swap_exception_ports( 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; if (count > *CountCnt) break; } @@ -1523,6 +1781,7 @@ task_swap_exception_ports( thread_state_flavor_array_t flavors) { ipc_port_t old_port[EXC_TYPES_COUNT]; + boolean_t privileged = current_task()->sec_token.val[0] == 0; unsigned int i, j, count; if (task == TASK_NULL) @@ -1532,7 +1791,7 @@ task_swap_exception_ports( return (KERN_INVALID_ARGUMENT); if (IP_VALID(new_port)) { - switch (new_behavior) { + switch (new_behavior & ~MACH_EXCEPTION_CODES) { case EXCEPTION_DEFAULT: case EXCEPTION_STATE: @@ -1581,6 +1840,7 @@ task_swap_exception_ports( 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; if (count > *CountCnt) break; }