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
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
#include <cstdint>
#include <cstdio>
#include <cstdlib>
#include <unordered_map>
#include "cbor.h"
static size_t allocated_mem = 0;
static std::unordered_map<void*, size_t> allocated_len_map;
static constexpr size_t kMemoryLimit = 1 << 30;
void *limited_malloc(size_t size) {
if (size + allocated_mem > kMemoryLimit) {
return nullptr;
}
if (size == 0) {
return nullptr;
}
void* m = malloc(size);
if (m != nullptr) {
allocated_mem += size;
allocated_len_map[m] = size;
}
return m;
}
void limited_free(void *ptr) {
if (ptr != NULL && allocated_len_map.find(ptr) == allocated_len_map.end()) {
abort();
}
free(ptr);
if (ptr != NULL) {
allocated_mem -= allocated_len_map[ptr];
allocated_len_map.erase(ptr);
}
}
void *limited_realloc(void *ptr, size_t size) {
if (ptr != NULL && allocated_len_map.find(ptr) == allocated_len_map.end()) {
abort();
}
if (ptr == NULL) {
return limited_malloc(size);
}
long delta = (long) size - allocated_len_map[ptr];
if (delta + allocated_mem > kMemoryLimit) {
return nullptr;
}
void* new_ptr = realloc(ptr, size);
if (size > 0 && new_ptr == nullptr) {
return nullptr;
}
allocated_mem += delta;
allocated_len_map.erase(ptr);
if (size > 0) {
allocated_len_map[new_ptr] = size;
}
return new_ptr;
}
struct State {
FILE* fout;
State() : fout(fopen("/dev/null", "r")) {
cbor_set_allocs(limited_malloc, limited_realloc, limited_free);
}
};
static State kState;
extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
cbor_load_result result;
cbor_item_t *item = cbor_load(Data, Size, &result);
if (result.error.code == CBOR_ERR_NONE) {
cbor_describe(item, kState.fout);
unsigned char *buffer;
size_t buffer_size;
cbor_serialize_alloc(item, &buffer, &buffer_size);
free(buffer);
cbor_item_t *copied = cbor_copy(item);
cbor_decref(&copied);
cbor_decref(&item);
}
return 0;
}
|
