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