1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
//#include <cutils/misc.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sched.h>
#include <errno.h>
#include <signal.h>
#include <sys/ptrace.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <pthread.h>
#include <cutils/sockets.h>
void crash1(void);
void crashnostack(void);
void maybeabort(void);
int do_action(const char* arg);
static void debuggerd_connect()
{
char tmp[1];
int s;
sprintf(tmp, "%d", gettid());
s = socket_local_client("android:debuggerd",
ANDROID_SOCKET_NAMESPACE_ABSTRACT, SOCK_STREAM);
if(s >= 0) {
read(s, tmp, 1);
close(s);
}
}
int smash_stack(int i) {
printf("crasher: deliberately corrupting stack...\n");
// Unless there's a "big enough" buffer on the stack, gcc
// doesn't bother inserting checks.
char buf[8];
// If we don't write something relatively unpredicatable
// into the buffer and then do something with it, gcc
// optimizes everything away and just returns a constant.
*(int*)(&buf[7]) = (uintptr_t) &buf[0];
return *(int*)(&buf[0]);
}
void test_call1()
{
*((int*) 32) = 1;
}
void *test_thread(void *x)
{
printf("crasher: thread pid=%d tid=%d\n", getpid(), gettid());
sleep(1);
test_call1();
printf("goodbye\n");
return 0;
}
void *noisy(void *x)
{
char c = (unsigned) x;
for(;;) {
usleep(250*1000);
write(2, &c, 1);
if(c == 'C') *((unsigned*) 0) = 42;
}
return 0;
}
int ctest()
{
pthread_t thr;
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
pthread_create(&thr, &attr, noisy, (void*) 'A');
pthread_create(&thr, &attr, noisy, (void*) 'B');
pthread_create(&thr, &attr, noisy, (void*) 'C');
for(;;) ;
return 0;
}
static void* thread_callback(void* raw_arg)
{
return (void*) do_action((const char*) raw_arg);
}
int do_action_on_thread(const char* arg)
{
pthread_t t;
pthread_create(&t, NULL, thread_callback, (void*) arg);
void* result = NULL;
pthread_join(t, &result);
return (int) result;
}
int do_action(const char* arg)
{
if(!strncmp(arg, "thread-", strlen("thread-"))) {
return do_action_on_thread(arg + strlen("thread-"));
}
if(!strcmp(arg,"smash-stack")) return smash_stack(42);
if(!strcmp(arg,"nostack")) crashnostack();
if(!strcmp(arg,"ctest")) return ctest();
if(!strcmp(arg,"exit")) exit(1);
if(!strcmp(arg,"abort")) maybeabort();
pthread_t thr;
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
pthread_create(&thr, &attr, test_thread, 0);
while(1) sleep(1);
}
int main(int argc, char **argv)
{
fprintf(stderr,"crasher: built at " __TIME__ "!@\n");
fprintf(stderr,"crasher: init pid=%d tid=%d\n", getpid(), gettid());
if(argc > 1) {
return do_action(argv[1]);
} else {
crash1();
// *((int*) 0) = 42;
}
return 0;
}
void maybeabort()
{
if(time(0) != 42) abort();
}
|
