1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright 2019 Alex Richardson <[email protected]>
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 * $FreeBSD$
33 */
34 #include <sys/cdefs.h>
35 #include <sys/param.h>
36 #include <sys/types.h>
37 #include <sys/sysctl.h>
38 #include <assert.h>
39 #include <signal.h>
40 #include <stdarg.h>
41 #include <stdlib.h>
42 #include <string.h>
43 #include <stdio.h>
44
45 #include "rtld.h"
46 #include "rtld_printf.h"
47 #include "rtld_libc.h"
48
49 /*
50 * Avoid dependencies from various libc calls on abort(). Since this is only
51 * used for assertions in RTLD, we can just raise SIGABRT directly.
52 */
53 void
abort(void)54 abort(void)
55 {
56 raise(SIGABRT);
57 __builtin_trap();
58 }
59
60 static int rtld_errno;
61 int *__error(void);
62 int *
__error(void)63 __error(void)
64 {
65
66 return (&rtld_errno);
67 }
68
69 /* Avoid dependency on __libc_interposing, use the system call directly. */
70 #undef sigprocmask
71 int
sigprocmask(int how,const sigset_t * set,sigset_t * oset)72 sigprocmask(int how, const sigset_t *set, sigset_t *oset)
73 {
74
75 return (__sys_sigprocmask(how, set, oset));
76 }
77 __strong_reference(sigprocmask, __libc_sigprocmask);
78
79 #if defined DEBUG || !defined(NDEBUG)
80 /* Provide an implementation of __assert that does not pull in fprintf() */
81 void
__assert(const char * func,const char * file,int line,const char * failedexpr)82 __assert(const char *func, const char *file, int line, const char *failedexpr)
83 {
84
85 if (func == NULL)
86 (void)rtld_fdprintf(STDERR_FILENO,
87 "Assertion failed: (%s), file %s, line %d.\n", failedexpr,
88 file, line);
89 else
90 (void)rtld_fdprintf(STDERR_FILENO,
91 "Assertion failed: (%s), function %s, file %s, line %d.\n",
92 failedexpr, func, file, line);
93 abort();
94 /* NOTREACHED */
95 }
96 #endif
97
98 /*
99 * Avoid pulling in all of pthreads from getpagesize().
100 * It normally uses libc/gen/auxv.c which pulls in pthread_once().
101 */
102 int
getpagesize(void)103 getpagesize(void)
104 {
105 int mib[2], value;
106 size_t size;
107 static int pagesize;
108
109 if (pagesize != 0)
110 return (pagesize);
111
112 if (npagesizes > 0)
113 pagesize = pagesizes[0];
114
115 if (pagesize == 0) {
116 mib[0] = CTL_HW;
117 mib[1] = HW_PAGESIZE;
118 size = sizeof(value);
119 if (sysctl(mib, nitems(mib), &value, &size, NULL, 0) == -1)
120 pagesize = PAGE_SIZE;
121 else
122 pagesize = value;
123 }
124
125 return (pagesize);
126 }
127
128 extern int __sys___sysctl(const int *name, u_int namelen, void *oldp,
129 size_t *oldlenp, const void *newp, size_t newlen);
130
131 int
sysctl(const int * name,u_int namelen,void * oldp,size_t * oldlenp,const void * newp,size_t newlen)132 sysctl(const int *name, u_int namelen, void *oldp, size_t *oldlenp,
133 const void *newp, size_t newlen)
134 {
135 int retval;
136
137 assert(name[0] != CTL_USER && "Not supported inside rtld!");
138 retval = __sys___sysctl(name, namelen, oldp, oldlenp, newp, newlen);
139 return (retval);
140 }
141