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
22int 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(file: path.c_str(), RTLD_LAZY);
31 assert(handle != 0);
32 typedef void **(* store_t)(void *p);
33 store_t StoreToTLS = (store_t)dlsym(handle: handle, name: "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, format: "DLERROR: %s\n", dlerror_msg);
40 fflush(stderr);
41 abort();
42 }
43 void *p = malloc(size: 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
64extern "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

source code of compiler-rt/test/lsan/TestCases/Linux/use_tls_dynamic.cpp