X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/8f6c56a50524aa785f7e596d52dddfb331e18961..060df5ea7c632b1ac8cc8aac1fb59758165c2084:/osfmk/kern/ipc_tt.c?ds=sidebyside diff --git a/osfmk/kern/ipc_tt.c b/osfmk/kern/ipc_tt.c index 2f6a9521f..019dacd6b 100644 --- a/osfmk/kern/ipc_tt.c +++ b/osfmk/kern/ipc_tt.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2007 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * @@ -53,6 +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. + */ /* */ @@ -88,9 +94,10 @@ #include #include -#include #include +#include + /* forward declarations */ task_t convert_port_to_locked_task(ipc_port_t port); @@ -113,6 +120,7 @@ ipc_task_init( { ipc_space_t space; ipc_port_t kport; + ipc_port_t nport; kern_return_t kr; int i; @@ -121,17 +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; @@ -144,6 +166,9 @@ ipc_task_init( task->itk_host = port; task->itk_bootstrap = IP_NULL; + 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; @@ -175,6 +200,15 @@ 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_task_access = + ipc_port_copy_send(parent->itk_task_access); + itk_unlock(parent); } } @@ -192,11 +226,15 @@ 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); } @@ -213,11 +251,15 @@ 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); } @@ -235,6 +277,7 @@ ipc_task_terminate( task_t task) { ipc_port_t kport; + ipc_port_t nport; int i; itk_lock(task); @@ -245,8 +288,12 @@ 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 */ @@ -266,6 +313,15 @@ 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_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]); @@ -273,15 +329,20 @@ 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); + + 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. + * 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.) @@ -423,6 +484,74 @@ 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: @@ -701,44 +830,58 @@ 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; + 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; @@ -758,6 +901,7 @@ 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 @@ -785,14 +929,26 @@ 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; + default: return KERN_INVALID_ARGUMENT; }/* switch */ @@ -803,6 +959,20 @@ 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); @@ -962,6 +1132,8 @@ 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; @@ -981,9 +1153,10 @@ 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; } @@ -1020,6 +1193,39 @@ 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: @@ -1199,6 +1405,33 @@ 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: @@ -1272,16 +1505,17 @@ 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) 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_CODES) { case EXCEPTION_DEFAULT: case EXCEPTION_STATE: @@ -1315,6 +1549,7 @@ 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; @@ -1347,11 +1582,11 @@ task_set_exception_ports( 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_CODES) { case EXCEPTION_DEFAULT: case EXCEPTION_STATE: @@ -1437,16 +1672,17 @@ 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) 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_CODES) { case EXCEPTION_DEFAULT: case EXCEPTION_STATE: @@ -1496,6 +1732,7 @@ 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; } @@ -1537,11 +1774,11 @@ task_swap_exception_ports( 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_CODES) { case EXCEPTION_DEFAULT: case EXCEPTION_STATE: @@ -1646,7 +1883,7 @@ thread_get_exception_ports( if (thread == THREAD_NULL) return (KERN_INVALID_ARGUMENT); - if (exception_mask & ~EXC_MASK_ALL) + if (exception_mask & ~EXC_MASK_VALID) return (KERN_INVALID_ARGUMENT); thread_mtx_lock(thread); @@ -1708,7 +1945,7 @@ task_get_exception_ports( 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);