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1 /*
2  * Copyright (C) 2017 The Android Open Source Project
3  * 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  *  * 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
13  *    distribution.
14  *
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
26  * SUCH DAMAGE.
27  */
28 
29 #include <android/set_abort_message.h>
30 
31 #include <pthread.h>
32 #include <string.h>
33 #include <sys/mman.h>
34 
35 #include "private/bionic_defs.h"
36 #include "private/ScopedPthreadMutexLocker.h"
37 
38 static pthread_mutex_t g_abort_msg_lock = PTHREAD_MUTEX_INITIALIZER;
39 
40 struct abort_msg_t {
41   size_t size;
42   char msg[0];
43 };
44 
45 abort_msg_t** __abort_message_ptr; // Accessible to __libc_init_common.
46 
47 __BIONIC_WEAK_FOR_NATIVE_BRIDGE
android_set_abort_message(const char * msg)48 void android_set_abort_message(const char* msg) {
49   ScopedPthreadMutexLocker locker(&g_abort_msg_lock);
50 
51   if (__abort_message_ptr == nullptr) {
52     // We must have crashed _very_ early.
53     return;
54   }
55 
56   if (*__abort_message_ptr != nullptr) {
57     // We already have an abort message.
58     // Assume that the first crash is the one most worth reporting.
59     return;
60   }
61 
62   size_t size = sizeof(abort_msg_t) + strlen(msg) + 1;
63   void* map = mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0);
64   if (map == MAP_FAILED) {
65     return;
66   }
67 
68   abort_msg_t* new_abort_message = reinterpret_cast<abort_msg_t*>(map);
69   new_abort_message->size = size;
70   strcpy(new_abort_message->msg, msg);
71   *__abort_message_ptr = new_abort_message;
72 }
73