1 // RUN: %clangxx_asan -O0 %s -o %t && not %run %t 2>&1 | FileCheck %s 2 3 // Windows does not have execinfo.h. For now, be conservative and 4 // restrict the test to glibc. 5 // REQUIRES: glibc-2.27 6 7 // Test the backtrace_symbols() interceptor. 8 9 #include <assert.h> 10 #include <execinfo.h> 11 #include <math.h> 12 #include <stdio.h> 13 #include <stdlib.h> 14 15 #define MAX_BT 100 16 main()17int main() { 18 void **buffer = (void **)malloc(sizeof(void *) * MAX_BT); 19 assert(buffer != NULL); 20 21 int numEntries = backtrace(buffer, MAX_BT); 22 printf("backtrace returned %d entries\n", numEntries); 23 24 free(buffer); 25 26 // Deliberate use-after-free of 'buffer'. We expect ASan to 27 // catch this, without triggering internal sanitizer errors. 28 char **strings = backtrace_symbols(buffer, numEntries); 29 assert(strings != NULL); 30 31 for (int i = 0; i < numEntries; i++) { 32 printf("%s\n", strings[i]); 33 } 34 35 free(strings); 36 37 // CHECK: use-after-free 38 // CHECK: SUMMARY 39 return 0; 40 } 41