1 // Test that dynamically allocated TLS space is included in the root set.
2
3 // This is known to be broken with glibc-2.27+ but it should pass with Bionic
4 // https://bugs.llvm.org/show_bug.cgi?id=37804
5 // XFAIL: glibc-2.27
6
7 // RUN: %clangxx %s -DBUILD_DSO -fPIC -shared -o %t-so.so
8 // RUN: %clangxx_lsan %s -o %t
9 // RUN: %env_lsan_opts="report_objects=1:use_stacks=0:use_registers=0:use_ld_allocations=0:use_tls=0" not %run %t 2>&1 | FileCheck %s
10 // RUN: %env_lsan_opts="report_objects=1:use_stacks=0:use_registers=0:use_ld_allocations=0:use_tls=1" %run %t 2>&1
11 // RUN: %env_lsan_opts="" %run %t 2>&1
12 // UNSUPPORTED: target={{(arm|powerpc).*}},i386-linux && !android
13
14 #ifndef BUILD_DSO
15 #include <assert.h>
16 #include <dlfcn.h>
17 #include <stdio.h>
18 #include <stdlib.h>
19 #include <string>
20 #include "sanitizer_common/print_address.h"
21
main(int argc,char * argv[])22 int main(int argc, char *argv[]) {
23 std::string path = std::string(argv[0]) + "-so.so";
24
25 // Clear any previous errors. On Android, the dynamic loader can have some
26 // left over dlerror() messages due to a missing symbol resolution for a
27 // deprecated malloc function.
28 dlerror();
29
30 void *handle = dlopen(path.c_str(), RTLD_LAZY);
31 assert(handle != 0);
32 typedef void **(* store_t)(void *p);
33 store_t StoreToTLS = (store_t)dlsym(handle, "StoreToTLS");
34
35 // Sometimes dlerror() occurs when we broke the interceptors.
36 // Add the message here to make the error more obvious.
37 const char *dlerror_msg = dlerror();
38 if (dlerror_msg != nullptr) {
39 fprintf(stderr, "DLERROR: %s\n", dlerror_msg);
40 fflush(stderr);
41 abort();
42 }
43 void *p = malloc(1337);
44 // If we don't know about dynamic TLS, we will return a false leak above.
45 void **p_in_tls = StoreToTLS(p);
46 assert(*p_in_tls == p);
47 print_address("Test alloc: ", 1, p);
48 return 0;
49 }
50 // CHECK: Test alloc: [[ADDR:0x[0-9,a-f]+]]
51 // CHECK: LeakSanitizer: detected memory leaks
52 // CHECK: [[ADDR]] (1337 bytes)
53 // CHECK: SUMMARY: {{.*}}Sanitizer:
54
55 #else // BUILD_DSO
56 // A loadable module with a large thread local section, which would require
57 // allocation of a new TLS storage chunk when loaded with dlopen(). We use it
58 // to test the reachability of such chunks in LSan tests.
59
60 // This must be large enough that it doesn't fit into preallocated static TLS
61 // space (see STATIC_TLS_SURPLUS in glibc).
62 __thread void *huge_thread_local_array[(1 << 20) / sizeof(void *)];
63
StoreToTLS(void * p)64 extern "C" void **StoreToTLS(void *p) {
65 huge_thread_local_array[0] = p;
66 return &huge_thread_local_array[0];
67 }
68 #endif // BUILD_DSO
69