/* * Copyright (c) 2011 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 * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * 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@ */ #include <mach/mach_types.h> #include <kern/host.h> #include <kern/thread.h> #include <kern/task.h> #include <kern/extmod_statistics.h> #include <libkern/OSAtomic.h> #include <uuid/uuid.h> /* * This code module adds statistics to track when * a userspace task is modified by another userspace * task. This can facilitate triage of crashes * and abberant behavior, which are not expected * to occur when the program is running in its * qualified environment. * * We assume the target task has a lifecycle lock * that will prevent it from exiting * (task_reference/task_reference_internal), which * should be called either explicitly, or implicitly * via MIG glue code (convert_port_to_task). * * Host-wide statistics don't asssume any locks are * held, and use atomic operations. * * If we can detect that the kernel proper is * performing these operations, don't count * it as an external modification. Some of the * external modification routines are called * by the kernel during thread setup, in which * case we rename the userspace entrypoint called * by the MIG demuxer to have a "_from_user" suffix. */ /* externs for BSD kernel */ extern void fslog_extmod_msgtracer(void *, void *); /* local routines */ static void extmod_statistics_log(task_t current_task, task_t target); void extmod_statistics_incr_task_for_pid(task_t target) { task_t ctask = current_task(); if ((ctask == kernel_task) || (target == TASK_NULL)) return; if (target != ctask) { ctask->extmod_statistics.task_for_pid_caller_count++; target->extmod_statistics.task_for_pid_count++; OSIncrementAtomic64(&host_extmod_statistics.task_for_pid_count); } } void extmod_statistics_incr_thread_set_state(thread_t target) { task_t ctask = current_task(); task_t ttask; if ((ctask == kernel_task) || (target == THREAD_NULL)) return; ttask = get_threadtask(target); if (ttask == TASK_NULL) return; if (ttask != ctask) { ctask->extmod_statistics.thread_set_state_caller_count++; ttask->extmod_statistics.thread_set_state_count++; OSIncrementAtomic64(&host_extmod_statistics.thread_set_state_count); } } void extmod_statistics_incr_thread_create(task_t target) { task_t ctask = current_task(); if ((ctask == kernel_task) || (target == TASK_NULL)) return; if (target != ctask) { ctask->extmod_statistics.thread_creation_caller_count++; target->extmod_statistics.thread_creation_count++; OSIncrementAtomic64(&host_extmod_statistics.thread_creation_count); extmod_statistics_log(ctask, target); } } static void extmod_statistics_log(task_t current_task, task_t target) { void *c_proc; void *t_proc; c_proc = get_bsdtask_info(current_task); t_proc = get_bsdtask_info(target); if (c_proc && t_proc) { fslog_extmod_msgtracer(c_proc, t_proc); } }