1 // Test that LargeAllocator unpoisons memory before releasing it to the OS.
2 // RUN: %clangxx_asan %s -o %t
3 // The memory is released only when the deallocated chunk leaves the quarantine,
4 // otherwise the mmap(p, ...) call overwrites the malloc header.
5 // RUN: %env_asan_opts=quarantine_size_mb=0 %run %t
6
7 #include <assert.h>
8 #include <string.h>
9 #include <sys/mman.h>
10 #include <stdlib.h>
11 #include <unistd.h>
12
13 #ifdef __ANDROID__
14 #include <malloc.h>
my_memalign(size_t boundary,size_t size)15 void *my_memalign(size_t boundary, size_t size) {
16 return memalign(boundary, size);
17 }
18 #else
my_memalign(size_t boundary,size_t size)19 void *my_memalign(size_t boundary, size_t size) {
20 void *p;
21 posix_memalign(&p, boundary, size);
22 return p;
23 }
24 #endif
25
main()26 int main() {
27 const long kPageSize = sysconf(_SC_PAGESIZE);
28 void *p = my_memalign(kPageSize, 1024 * 1024);
29 free(p);
30
31 char *q = (char *)mmap(p, kPageSize, PROT_READ | PROT_WRITE,
32 MAP_PRIVATE | MAP_ANON | MAP_FIXED, -1, 0);
33 assert(q == p);
34
35 memset(q, 42, kPageSize);
36
37 munmap(q, kPageSize);
38 return 0;
39 }
40