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1 /*
2 * Copyright (c) 1985, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #pragma clang diagnostic push
31 #pragma clang diagnostic ignored "-Wstrict-prototypes"
32
33 #if defined(LIBC_SCCS) && !defined(lint)
34 static char sccsid[] = "@(#)abort.c 8.1 (Berkeley) 6/4/93";
35 #endif /* LIBC_SCCS and not lint */
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD: src/lib/libc/stdlib/abort.c,v 1.11 2007/01/09 00:28:09 imp Exp $");
38
39 #include "namespace.h"
40 #include <signal.h>
41 #include <stdarg.h>
42 #include <stdlib.h>
43 #include <stddef.h>
44 #include <unistd.h>
45 #include <pthread.h>
46 #include <pthread_workqueue.h>
47 #include "un-namespace.h"
48
49 #include "libc_private.h"
50
51 #if __has_include(<CrashReporterClient.h>)
52 #include <CrashReporterClient.h>
53 #else
54 #define CRGetCrashLogMessage() NULL
55 #define CRSetCrashLogMessage(...)
56 #endif
57 #include "_simple.h"
58
59 extern void (*__cleanup)();
60 extern void __abort(void) __cold __dead2;
61
62 #define TIMEOUT 10000 /* 10 milliseconds */
63
64 void
65 abort()
66 {
67 struct sigaction act;
68
69 if (!CRGetCrashLogMessage())
70 CRSetCrashLogMessage("abort() called");
71
72 /*
73 * POSIX requires we flush stdio buffers on abort.
74 * XXX ISO C requires that abort() be async-signal-safe.
75 */
76 if (__cleanup)
77 (*__cleanup)();
78
79 sigfillset(&act.sa_mask);
80 /*
81 * Don't block SIGABRT to give any handler a chance; we ignore
82 * any errors -- ISO C doesn't allow abort to return anyway.
83 */
84 sigdelset(&act.sa_mask, SIGABRT);
85
86 /*
87 * Don't block SIGSEGV since we might trigger a segfault if the pthread
88 * struct is corrupt. The end user behavior is that the program will
89 * terminate with a SIGSEGV instead of a SIGABRT which is acceptable. If
90 * the user registers a SIGSEGV handler, then they are responsible for
91 * dealing with any corruption themselves and abort may not work.
92 * rdar://48853131
93 */
94 sigdelset(&act.sa_mask, SIGSEGV);
95 sigdelset(&act.sa_mask, SIGBUS);
96
97 /* <rdar://problem/7397932> abort() should call pthread_kill to deliver a signal to the aborting thread
98 * This helps gdb focus on the thread calling abort()
99 */
100
101 /* Block all signals on all other threads */
102 sigset_t fullmask;
103 sigfillset(&fullmask);
104 (void)_sigprocmask(SIG_SETMASK, &fullmask, NULL);
105
106 /* <rdar://problem/8400096> Set the workqueue killable */
107 __pthread_workqueue_setkill(1);
108
109 (void)pthread_sigmask(SIG_SETMASK, &act.sa_mask, NULL);
110 (void)pthread_kill(pthread_self(), SIGABRT);
111
112 usleep(TIMEOUT); /* give time for signal to happen */
113
114 /*
115 * If SIGABRT was ignored, or caught and the handler returns, do
116 * it again, only harder.
117 */
118 __abort();
119 }
120
121 __private_extern__ void
122 __abort()
123 {
124 struct sigaction act;
125
126 if (!CRGetCrashLogMessage())
127 CRSetCrashLogMessage("__abort() called");
128 act.sa_handler = SIG_DFL;
129 act.sa_flags = 0;
130 sigfillset(&act.sa_mask);
131 (void)_sigaction(SIGABRT, &act, NULL);
132 sigdelset(&act.sa_mask, SIGABRT);
133
134 /* <rdar://problem/7397932> abort() should call pthread_kill to deliver a signal to the aborting thread
135 * This helps gdb focus on the thread calling abort()
136 */
137
138 /* Block all signals on all other threads */
139 sigset_t fullmask;
140 sigfillset(&fullmask);
141 (void)_sigprocmask(SIG_SETMASK, &fullmask, NULL);
142
143 /* <rdar://problem/8400096> Set the workqueue killable */
144 __pthread_workqueue_setkill(1);
145
146 (void)pthread_sigmask(SIG_SETMASK, &act.sa_mask, NULL);
147 (void)pthread_kill(pthread_self(), SIGABRT);
148
149 usleep(TIMEOUT); /* give time for signal to happen */
150
151 /* If for some reason SIGABRT was not delivered, we exit using __builtin_trap
152 * which generates an illegal instruction on i386: <rdar://problem/8400958>
153 * and SIGTRAP on arm.
154 */
155 sigfillset(&act.sa_mask);
156 sigdelset(&act.sa_mask, SIGILL);
157 sigdelset(&act.sa_mask, SIGTRAP);
158 (void)_sigprocmask(SIG_SETMASK, &act.sa_mask, NULL);
159 __builtin_trap();
160 }
161
162 void
163 abort_report_np(const char *fmt, ...)
164 {
165 _SIMPLE_STRING s;
166 va_list ap;
167
168 if ((s = _simple_salloc()) != NULL) {
169 va_start(ap, fmt);
170 _simple_vsprintf(s, fmt, ap);
171 va_end(ap);
172 CRSetCrashLogMessage(_simple_string(s));
173 } else
174 CRSetCrashLogMessage(fmt); /* the format string is better than nothing */
175 abort();
176 }
177 #pragma clang diagnostic pop