1 // Check handle_bus flag
2 // Defaults to true
3 // RUN: %clangxx_asan -std=c++11 %s -o %t
4 // RUN: not %run %t 2>&1 | FileCheck %s -check-prefix=CHECK-BUS
5 // RUN: %env_asan_opts=handle_sigbus=0 not --crash %run %t 2>&1 | FileCheck %s
6
7 // UNSUPPORTED: ios
8
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_FILE
18 #define MAP_FILE 0
19 #endif
20
21 char array[4096];
main(int argc,char ** argv)22 int 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 size
31 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 more
39 assert(ftruncate(fd, 0) == 0);
40
41 // Try to access the memory
42 return addr[42];
43 // CHECK-NOT: DEADLYSIGNAL
44 // CHECK-BUS: DEADLYSIGNAL
45 // CHECK-BUS: ERROR: AddressSanitizer: BUS
46 }
47