1 // REQUIRES: asan-64-bits
2 // UNSUPPORTED: android
3 // Stress test dynamic TLS + dlopen + threads.
4 //
5 // Note that glibc 2.15 seems utterly broken on this test,
6 // it fails with ~17 DSOs dlopen-ed.
7 // glibc 2.19 seems fine.
8 //
9 //
10 // RUN: %clangxx_asan -x c -DSO_NAME=f0 %s -shared -o %t-f0.so -fPIC
11 // RUN: %clangxx_asan -x c -DSO_NAME=f1 %s -shared -o %t-f1.so -fPIC
12 // RUN: %clangxx_asan -x c -DSO_NAME=f2 %s -shared -o %t-f2.so -fPIC
13 // RUN: %clangxx_asan %s -ldl -pthread -o %t
14 // RUN: %run %t 0 3
15 // RUN: %run %t 2 3
16 // RUN: %env_asan_opts=verbosity=2 %run %t 10 2 2>&1 | FileCheck %s
17 // RUN: %env_asan_opts=verbosity=2:intercept_tls_get_addr=1 %run %t 10 2 2>&1 | FileCheck %s
18 // RUN: %env_asan_opts=verbosity=2:intercept_tls_get_addr=0 %run %t 10 2 2>&1 | FileCheck %s --check-prefix=CHECK0
19 // CHECK: __tls_get_addr
20 // CHECK: Creating thread 0
21 // CHECK: __tls_get_addr
22 // CHECK: Creating thread 1
23 // CHECK: __tls_get_addr
24 // CHECK: Creating thread 2
25 // CHECK: __tls_get_addr
26 // CHECK: Creating thread 3
27 // CHECK: __tls_get_addr
28 // Make sure that TLS slots don't leak
29 // CHECK-NOT: num_live_dtls 5
30 //
31 // CHECK0-NOT: __tls_get_addr
32 /*
33 cc=your-compiler
34
35 $cc stress_dtls.c -pthread -ldl
36 for((i=0;i<100;i++)); do
37 $cc -fPIC -shared -DSO_NAME=f$i -o a.out-f$i.so stress_dtls.c;
38 done
39 ./a.out 2 4 # <<<<<< 2 threads, 4 libs
40 ./a.out 3 50 # <<<<<< 3 threads, 50 libs
41 */
42 #ifndef SO_NAME
43 #define _GNU_SOURCE
44 #include <assert.h>
45 #include <dlfcn.h>
46 #include <stdio.h>
47 #include <stdlib.h>
48 #include <pthread.h>
49 #include <stdint.h>
50
51 typedef void **(*f_t)();
52
53 __thread int my_tls;
54
55 #define MAX_N_FUNCTIONS 1000
56 f_t Functions[MAX_N_FUNCTIONS];
57
PrintStuff(void * unused)58 void *PrintStuff(void *unused) {
59 uintptr_t stack;
60 // fprintf(stderr, "STACK: %p TLS: %p SELF: %p\n", &stack, &my_tls,
61 // (void *)pthread_self());
62 int i;
63 for (i = 0; i < MAX_N_FUNCTIONS; i++) {
64 if (!Functions[i]) break;
65 uintptr_t dtls = (uintptr_t)Functions[i]();
66 fprintf(stderr, " dtls[%03d]: %lx\n", i, dtls);
67 *(long*)dtls = 42; // check that this is writable.
68 }
69 return NULL;
70 }
71
main(int argc,char * argv[])72 int main(int argc, char *argv[]) {
73 int num_threads = 1;
74 int num_libs = 1;
75 if (argc >= 2)
76 num_threads = atoi(argv[1]);
77 if (argc >= 3)
78 num_libs = atoi(argv[2]);
79 assert(num_libs <= MAX_N_FUNCTIONS);
80
81 int lib;
82 for (lib = 0; lib < num_libs; lib++) {
83 char buf[4096];
84 snprintf(buf, sizeof(buf), "%s-f%d.so", argv[0], lib);
85 void *handle = dlopen(buf, RTLD_LAZY);
86 if (!handle) {
87 fprintf(stderr, "%s\n", dlerror());
88 exit(1);
89 }
90 snprintf(buf, sizeof(buf), "f%d", lib);
91 Functions[lib] = (f_t)dlsym(handle, buf);
92 if (!Functions[lib]) {
93 fprintf(stderr, "%s\n", dlerror());
94 exit(1);
95 }
96 fprintf(stderr, "LIB[%03d] %s: %p\n", lib, buf, Functions[lib]);
97 PrintStuff(0);
98
99 int i;
100 for (i = 0; i < num_threads; i++) {
101 pthread_t t;
102 fprintf(stderr, "Creating thread %d\n", i);
103 pthread_create(&t, 0, PrintStuff, 0);
104 pthread_join(t, 0);
105 }
106 }
107 return 0;
108 }
109 #else // SO_NAME
110 #ifndef DTLS_SIZE
111 # define DTLS_SIZE (1 << 17)
112 #endif
113 __thread void *huge_thread_local_array[DTLS_SIZE];
SO_NAME()114 void **SO_NAME() {
115 return &huge_thread_local_array[0];
116 }
117 #endif
118