1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright 2019 Alex Richardson <arichardson@FreeBSD.org> 5 * 6 * This software was developed by SRI International and the University of 7 * Cambridge Computer Laboratory (Department of Computer Science and 8 * Technology) under DARPA contract HR0011-18-C-0016 ("ECATS"), as part of the 9 * DARPA SSITH research programme. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 #include <sys/cdefs.h> 33 #include <sys/param.h> 34 #include <sys/types.h> 35 #include <sys/sysctl.h> 36 #include <assert.h> 37 #include <signal.h> 38 #include <stdarg.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <stdio.h> 42 43 #include "rtld.h" 44 #include "rtld_printf.h" 45 #include "rtld_libc.h" 46 47 /* 48 * Avoid dependencies from various libc calls on abort(). Since this is only 49 * used for assertions in RTLD, we can just raise SIGABRT directly. 50 */ 51 void 52 abort(void) 53 { 54 raise(SIGABRT); 55 __builtin_trap(); 56 } 57 58 static int rtld_errno; 59 int *__error(void); 60 int * 61 __error(void) 62 { 63 64 return (&rtld_errno); 65 } 66 67 /* Avoid dependency on __libc_interposing, use the system call directly. */ 68 #undef sigprocmask 69 int 70 sigprocmask(int how, const sigset_t *set, sigset_t *oset) 71 { 72 73 return (__sys_sigprocmask(how, set, oset)); 74 } 75 __strong_reference(sigprocmask, __libc_sigprocmask); 76 77 #if defined DEBUG || !defined(NDEBUG) 78 /* Provide an implementation of __assert that does not pull in fprintf() */ 79 void 80 __assert(const char *func, const char *file, int line, const char *failedexpr) 81 { 82 83 if (func == NULL) 84 (void)rtld_fdprintf(STDERR_FILENO, 85 "Assertion failed: (%s), file %s, line %d.\n", failedexpr, 86 file, line); 87 else 88 (void)rtld_fdprintf(STDERR_FILENO, 89 "Assertion failed: (%s), function %s, file %s, line %d.\n", 90 failedexpr, func, file, line); 91 abort(); 92 /* NOTREACHED */ 93 } 94 #endif 95 96 /* 97 * Avoid pulling in all of pthreads from getpagesize(). 98 * It normally uses libc/gen/auxv.c which pulls in pthread_once(). 99 * This relies on init_pagesizes setting page_size so must not be called 100 * before that. 101 */ 102 int 103 getpagesize(void) 104 { 105 return (page_size); 106 } 107 108 extern int __sys___sysctl(const int *name, u_int namelen, void *oldp, 109 size_t *oldlenp, const void *newp, size_t newlen); 110 111 int 112 sysctl(const int *name, u_int namelen, void *oldp, size_t *oldlenp, 113 const void *newp, size_t newlen) 114 { 115 int retval; 116 117 assert(name[0] != CTL_USER && "Not supported inside rtld!"); 118 retval = __sys___sysctl(name, namelen, oldp, oldlenp, newp, newlen); 119 return (retval); 120 } 121