1// Regression test for 2// http://code.google.com/p/address-sanitizer/issues/detail?id=19 3// Bug description: 4// 1. application dlopens foo.so 5// 2. asan registers all globals from foo.so 6// 3. application dlcloses foo.so 7// 4. application mmaps some memory to the location where foo.so was before 8// 5. application starts using this mmaped memory, but asan still thinks there 9// are globals. 10// 6. BOOM 11 12// This sublte test assumes that after a foo.so is dlclose-d 13// we can mmap the region of memory that has been occupied by the library. 14// It works on i368/x86_64 Linux, but not necessary anywhere else. 15// REQUIRES: x86_64-supported-target,i386-supported-target 16 17// RUN: %clangxx_asan -O0 %p/SharedLibs/dlclose-test-so.cc \ 18// RUN: -fPIC -shared -o %t-so.so 19// RUN: %clangxx_asan -O0 %s -o %t && %t 2>&1 | FileCheck %s 20// RUN: %clangxx_asan -O1 %p/SharedLibs/dlclose-test-so.cc \ 21// RUN: -fPIC -shared -o %t-so.so 22// RUN: %clangxx_asan -O1 %s -o %t && %t 2>&1 | FileCheck %s 23// RUN: %clangxx_asan -O2 %p/SharedLibs/dlclose-test-so.cc \ 24// RUN: -fPIC -shared -o %t-so.so 25// RUN: %clangxx_asan -O2 %s -o %t && %t 2>&1 | FileCheck %s 26// RUN: %clangxx_asan -O3 %p/SharedLibs/dlclose-test-so.cc \ 27// RUN: -fPIC -shared -o %t-so.so 28// RUN: %clangxx_asan -O3 %s -o %t && %t 2>&1 | FileCheck %s 29 30#include <assert.h> 31#include <dlfcn.h> 32#include <stdio.h> 33#include <string.h> 34#include <sys/mman.h> 35#include <unistd.h> 36 37#include <string> 38 39using std::string; 40 41typedef int *(fun_t)(); 42 43int main(int argc, char *argv[]) { 44 string path = string(argv[0]) + "-so.so"; 45 size_t PageSize = sysconf(_SC_PAGESIZE); 46 printf("opening %s ... \n", path.c_str()); 47 void *lib = dlopen(path.c_str(), RTLD_NOW); 48 if (!lib) { 49 printf("error in dlopen(): %s\n", dlerror()); 50 return 1; 51 } 52 fun_t *get = (fun_t*)dlsym(lib, "get_address_of_static_var"); 53 if (!get) { 54 printf("failed dlsym\n"); 55 return 1; 56 } 57 int *addr = get(); 58 assert(((size_t)addr % 32) == 0); // should be 32-byte aligned. 59 printf("addr: %p\n", addr); 60 addr[0] = 1; // make sure we can write there. 61 62 // Now dlclose the shared library. 63 printf("attempting to dlclose\n"); 64 if (dlclose(lib)) { 65 printf("failed to dlclose\n"); 66 return 1; 67 } 68 // Now, the page where 'addr' is unmapped. Map it. 69 size_t page_beg = ((size_t)addr) & ~(PageSize - 1); 70 void *res = mmap((void*)(page_beg), PageSize, 71 PROT_READ | PROT_WRITE, 72 MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE, 0, 0); 73 if (res == (char*)-1L) { 74 printf("failed to mmap\n"); 75 return 1; 76 } 77 addr[1] = 2; // BOOM (if the bug is not fixed). 78 printf("PASS\n"); 79 // CHECK: PASS 80 return 0; 81} 82