/* * Copyright (c) 2016 Apple Computer, 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 <kern/backtrace.h> #include <kern/kalloc.h> #include <sys/errno.h> #include <sys/sysctl.h> #include <sys/systm.h> #define MAX_BACKTRACE (128) #define BACKTRACE_USER (0) static int backtrace_sysctl SYSCTL_HANDLER_ARGS; SYSCTL_NODE(_kern, OID_AUTO, backtrace, CTLFLAG_RW | CTLFLAG_LOCKED, 0, "backtrace"); SYSCTL_PROC(_kern_backtrace, OID_AUTO, user, CTLFLAG_RW | CTLFLAG_LOCKED, (void *)BACKTRACE_USER, sizeof(uint64_t), backtrace_sysctl, "O", "take user backtrace of current thread"); static int backtrace_sysctl SYSCTL_HANDLER_ARGS { #pragma unused(oidp, arg2) uintptr_t *bt; uint32_t bt_len, bt_filled; uintptr_t type = (uintptr_t)arg1; bool user_64; int err = 0; if (type != BACKTRACE_USER) { return EINVAL; } if (req->oldptr == USER_ADDR_NULL || req->oldlen == 0) { return EFAULT; } bt_len = req->oldlen > MAX_BACKTRACE ? MAX_BACKTRACE : req->oldlen; bt = kalloc(sizeof(uintptr_t) * bt_len); if (!bt) { return ENOBUFS; } err = backtrace_user(bt, bt_len, &bt_filled, &user_64); if (err) { goto out; } err = copyout(bt, req->oldptr, bt_filled * sizeof(uint64_t)); if (err) { goto out; } req->oldidx = bt_filled; out: kfree(bt, sizeof(uintptr_t) * bt_len); return err; }