47 lines · cpp
1// Check handle_bus flag2// Defaults to true3// RUN: %clangxx_asan -std=c++11 %s -o %t4// RUN: not %run %t 2>&1 | FileCheck %s -check-prefix=CHECK-BUS5// RUN: %env_asan_opts=handle_sigbus=0 not --crash %run %t 2>&1 | FileCheck %s6 7// UNSUPPORTED: ios8 9#include <assert.h>10#include <fcntl.h>11#include <stdio.h>12#include <stdlib.h>13#include <sys/mman.h>14#include <unistd.h>15#include <string>16 17#ifndef MAP_FILE18#define MAP_FILE 019#endif20 21char array[4096];22int main(int argc, char **argv) {23 int fd = open((std::string(argv[0]) + ".m").c_str(), O_RDWR | O_CREAT, 0700);24 if (fd < 0) {25 perror("open");26 exit(1);27 }28 assert(write(fd, array, sizeof(array)) == sizeof(array));29 30 // Write some zeroes to the file, then mmap it while it has a 4KiB size31 char *addr = (char *)mmap(nullptr, sizeof(array), PROT_READ,32 MAP_FILE | MAP_SHARED, fd, 0);33 if (addr == MAP_FAILED) {34 perror("mmap");35 exit(1);36 }37 38 // Truncate the file so our memory isn't valid any more39 assert(ftruncate(fd, 0) == 0);40 41 // Try to access the memory42 return addr[42];43 // CHECK-NOT: DEADLYSIGNAL44 // CHECK-BUS: DEADLYSIGNAL45 // CHECK-BUS: ERROR: AddressSanitizer: BUS46}47