2
* Copyright (C) 2008 The Android Open Source Project
5
* Redistribution and use in source and binary forms, with or without
6
* modification, are permitted provided that the following conditions
8
* * Redistributions of source code must retain the above copyright
9
* notice, this list of conditions and the following disclaimer.
10
* * Redistributions in binary form must reproduce the above copyright
11
* notice, this list of conditions and the following disclaimer in
12
* the documentation and/or other materials provided with the
15
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39
#include <sys/socket.h>
42
void notify_gdb_of_libraries();
44
#define RETRY_ON_EINTR(ret,cond) \
47
} while (ret < 0 && errno == EINTR)
50
static int socket_abstract_client(const char *name, int type)
52
struct sockaddr_un addr;
57
namelen = strlen(name);
59
// Test with length +1 for the *initial* '\0'.
60
if ((namelen + 1) > sizeof(addr.sun_path)) {
65
/* This is used for abstract socket namespace, we need
66
* an initial '\0' at the start of the Unix socket path.
68
* Note: The path in this case is *not* supposed to be
69
* '\0'-terminated. ("man 7 unix" for the gory details.)
71
memset (&addr, 0, sizeof addr);
72
addr.sun_family = AF_LOCAL;
74
memcpy(addr.sun_path + 1, name, namelen);
76
alen = namelen + offsetof(struct sockaddr_un, sun_path) + 1;
78
s = socket(AF_LOCAL, type, 0);
81
RETRY_ON_EINTR(err,connect(s, (struct sockaddr *) &addr, alen));
90
#include "linker_format.h"
91
#include <../libc/private/logd.h>
94
* Writes a summary of the signal to the log file.
96
* We could be here as a result of native heap corruption, or while a
97
* mutex is being held, so we don't want to use any libc functions that
98
* could allocate memory or hold a lock.
100
static void logSignalSummary(int signum, const siginfo_t* info)
106
case SIGILL: signame = "SIGILL"; break;
107
case SIGABRT: signame = "SIGABRT"; break;
108
case SIGBUS: signame = "SIGBUS"; break;
109
case SIGFPE: signame = "SIGFPE"; break;
110
case SIGSEGV: signame = "SIGSEGV"; break;
111
case SIGSTKFLT: signame = "SIGSTKFLT"; break;
112
case SIGPIPE: signame = "SIGPIPE"; break;
113
default: signame = "???"; break;
116
format_buffer(buffer, sizeof(buffer),
117
"Fatal signal %d (%s) at 0x%08x (code=%d)",
118
signum, signame, info->si_addr, info->si_code);
120
__libc_android_log_write(ANDROID_LOG_FATAL, "libc", buffer);
124
* Catches fatal signals so we can ask debuggerd to ptrace us before
127
void debugger_signal_handler(int n, siginfo_t* info, void* unused)
132
logSignalSummary(n, info);
135
s = socket_abstract_client("android:debuggerd", SOCK_STREAM);
138
/* debugger knows our pid from the credentials on the
139
* local socket but we need to tell it our tid. It
140
* is paranoid and will verify that we are giving a tid
141
* that's actually in our process
145
RETRY_ON_EINTR(ret, write(s, &tid, sizeof(unsigned)));
146
if (ret == sizeof(unsigned)) {
147
/* if the write failed, there is no point to read on
148
* the file descriptor. */
149
RETRY_ON_EINTR(ret, read(s, &tid, 1));
150
notify_gdb_of_libraries();
155
/* remove our net so we fault for real when we return */
161
struct sigaction act;
162
memset(&act, 0, sizeof(act));
163
act.sa_sigaction = debugger_signal_handler;
164
act.sa_flags = SA_RESTART | SA_SIGINFO;
165
sigemptyset(&act.sa_mask);
167
sigaction(SIGILL, &act, NULL);
168
sigaction(SIGABRT, &act, NULL);
169
sigaction(SIGBUS, &act, NULL);
170
sigaction(SIGFPE, &act, NULL);
171
sigaction(SIGSEGV, &act, NULL);
172
sigaction(SIGSTKFLT, &act, NULL);
173
sigaction(SIGPIPE, &act, NULL);