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
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
abort(void)52 abort(void)
53 {
54 raise(SIGABRT);
55 __builtin_trap();
56 }
57
58 static int rtld_errno;
59 int *__error(void);
60 int *
__error(void)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
sigprocmask(int how,const sigset_t * set,sigset_t * oset)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
__assert(const char * func,const char * file,int line,const char * failedexpr)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
getpagesize(void)103 getpagesize(void)
104 {
105 return (page_size);
106 }
107
108 int __sys___sysctl(const int *name, u_int namelen, void *oldp,
109 size_t *oldlenp, const void *newp, size_t newlen);
110
111 int
sysctl(const int * name,u_int namelen,void * oldp,size_t * oldlenp,const void * newp,size_t newlen)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