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	1	/*
	2	* Copyright (c) 2011 Apple Inc. All rights reserved.
	3	*
	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
	25	*
	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
	27	*/
	28
	29	#include <mach/mach_types.h>
	30
	31	#include <kern/host.h>
	32	#include <kern/thread.h>
	33	#include <kern/task.h>
	34	#include <kern/extmod_statistics.h>
	35	#include <libkern/OSAtomic.h>
	36
	37	#include <uuid/uuid.h>
	38
	39	/*
	40	* This code module adds statistics to track when
	41	* a userspace task is modified by another userspace
	42	* task. This can facilitate triage of crashes
	43	* and abberant behavior, which are not expected
	44	* to occur when the program is running in its
	45	* qualified environment.
	46	*
	47	* We assume the target task has a lifecycle lock
	48	* that will prevent it from exiting
	49	* (task_reference/task_reference_internal), which
	50	* should be called either explicitly, or implicitly
	51	* via MIG glue code (convert_port_to_task).
	52	*
	53	* Host-wide statistics don't asssume any locks are
	54	* held, and use atomic operations.
	55	*
	56	* If we can detect that the kernel proper is
	57	* performing these operations, don't count
	58	* it as an external modification. Some of the
	59	* external modification routines are called
	60	* by the kernel during thread setup, in which
	61	* case we rename the userspace entrypoint called
	62	* by the MIG demuxer to have a "_from_user" suffix.
	63	*/
	64
	65	/* externs for BSD kernel */
	66	extern void fslog_extmod_msgtracer(void , void );
	67
	68	/* local routines */
	69	static void
	70	extmod_statistics_log(task_t current_task, task_t target);
	71
	72	void
	73	extmod_statistics_incr_task_for_pid(task_t target)
	74	{
	75	task_t ctask = current_task();
	76
	77	if ((ctask == kernel_task) \|\| (target == TASK_NULL)) {
	78	return;
	79	}
	80
	81	if (target != ctask) {
	82	ctask->extmod_statistics.task_for_pid_caller_count++;
	83	target->extmod_statistics.task_for_pid_count++;
	84	OSIncrementAtomic64(&host_extmod_statistics.task_for_pid_count);
	85	}
	86	}
	87
	88	void
	89	extmod_statistics_incr_thread_set_state(thread_t target)
	90	{
	91	task_t ctask = current_task();
	92	task_t ttask;
	93
	94	if ((ctask == kernel_task) \|\| (target == THREAD_NULL)) {
	95	return;
	96	}
	97
	98	ttask = get_threadtask(target);
	99
	100	if (ttask == TASK_NULL) {
	101	return;
	102	}
	103
	104	if (ttask != ctask) {
	105	ctask->extmod_statistics.thread_set_state_caller_count++;
	106	ttask->extmod_statistics.thread_set_state_count++;
	107	OSIncrementAtomic64(&host_extmod_statistics.thread_set_state_count);
	108	}
	109	}
	110
	111	void
	112	extmod_statistics_incr_thread_create(task_t target)
	113	{
	114	task_t ctask = current_task();
	115
	116	if ((ctask == kernel_task) \|\| (target == TASK_NULL)) {
	117	return;
	118	}
	119
	120	if (target != ctask) {
	121	ctask->extmod_statistics.thread_creation_caller_count++;
	122	target->extmod_statistics.thread_creation_count++;
	123	OSIncrementAtomic64(&host_extmod_statistics.thread_creation_count);
	124
	125	extmod_statistics_log(ctask, target);
	126	}
	127	}
	128
	129	static void
	130	extmod_statistics_log(task_t current_task, task_t target)
	131	{
	132	void *c_proc;
	133	void *t_proc;
	134
	135	c_proc = get_bsdtask_info(current_task);
	136	t_proc = get_bsdtask_info(target);
	137	if (c_proc && t_proc) {
	138	fslog_extmod_msgtracer(c_proc, t_proc);
	139	}
	140	}