1 // Test that dynamically allocated TLS space is included in the root set. 2 // RUN: LSAN_BASE="report_objects=1:use_stacks=0:use_registers=0:use_ld_allocations=0" 3 // RUN: %clangxx %s -DBUILD_DSO -fPIC -shared -o %t-so.so 4 // RUN: %clangxx_lsan %s -o %t 5 // RUN: LSAN_OPTIONS=$LSAN_BASE:"use_tls=0" not %run %t 2>&1 | FileCheck %s 6 // RUN: LSAN_OPTIONS=$LSAN_BASE:"use_tls=1" %run %t 2>&1 7 // RUN: LSAN_OPTIONS="" %run %t 2>&1 8 9 #ifndef BUILD_DSO 10 #include <assert.h> 11 #include <dlfcn.h> 12 #include <stdio.h> 13 #include <stdlib.h> 14 #include <string> 15 main(int argc,char * argv[])16int main(int argc, char *argv[]) { 17 std::string path = std::string(argv[0]) + "-so.so"; 18 19 void *handle = dlopen(path.c_str(), RTLD_LAZY); 20 assert(handle != 0); 21 typedef void **(* store_t)(void *p); 22 store_t StoreToTLS = (store_t)dlsym(handle, "StoreToTLS"); 23 assert(dlerror() == 0); 24 25 void *p = malloc(1337); 26 // If we don't know about dynamic TLS, we will return a false leak above. 27 void **p_in_tls = StoreToTLS(p); 28 assert(*p_in_tls == p); 29 fprintf(stderr, "Test alloc: %p.\n", p); 30 return 0; 31 } 32 // CHECK: Test alloc: [[ADDR:.*]]. 33 // CHECK: LeakSanitizer: detected memory leaks 34 // CHECK: [[ADDR]] (1337 bytes) 35 // CHECK: SUMMARY: {{(Leak|Address)}}Sanitizer: 36 37 #else // BUILD_DSO 38 // A loadable module with a large thread local section, which would require 39 // allocation of a new TLS storage chunk when loaded with dlopen(). We use it 40 // to test the reachability of such chunks in LSan tests. 41 42 // This must be large enough that it doesn't fit into preallocated static TLS 43 // space (see STATIC_TLS_SURPLUS in glibc). 44 __thread void *huge_thread_local_array[(1 << 20) / sizeof(void *)]; // NOLINT 45 StoreToTLS(void * p)46extern "C" void **StoreToTLS(void *p) { 47 huge_thread_local_array[0] = p; 48 return &huge_thread_local_array[0]; 49 } 50 #endif // BUILD_DSO 51