sniffer/heap_safe.cpp at develop · rgagnon24/sniffer · GitHub

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
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
#include "heap_safe.h"


unsigned int HeapSafeCheck = 0;


inline void *_heapsafe_alloc(size_t sizeOfObject) {
	return(malloc(sizeOfObject));
}

inline void _heapsafe_free(void *pointerToObject) {
	free(pointerToObject);
}

inline void * heapsafe_alloc(size_t sizeOfObject) {
	extern unsigned int HeapSafeCheck;
	void *pointerToObject = NULL;
	int error = 0;
	try {
		pointerToObject = _heapsafe_alloc(sizeOfObject + HEAPSAFE_ALLOC_RESERVE +
						  (HeapSafeCheck & _HeapSafeErrorBeginEnd ?
						    2 * sizeof(sHeapSafeMemoryControlBlock):
						    0));
	}
	catch(...) {
		if(HeapSafeCheck & _HeapSafeErrorInAllocFce) {
			error = _HeapSafeErrorInAllocFce;
		}
	}
	if(!error && !pointerToObject) {
		error = _HeapSafeErrorNotEnoughMemory;
	}
	if(error) {
		      HeapSafeAllocError(error);
		return(pointerToObject);
	}
	memset(pointerToObject,
	       HeapSafeCheck & _HeapSafeErrorFillFF ? 0xFF : 0,
	       sizeOfObject + HEAPSAFE_ALLOC_RESERVE +
	       (HeapSafeCheck & _HeapSafeErrorBeginEnd ?
                2 * sizeof(sHeapSafeMemoryControlBlock):
		0));
	if(HeapSafeCheck & _HeapSafeErrorBeginEnd) {
		sHeapSafeMemoryControlBlock *begin = (sHeapSafeMemoryControlBlock*)pointerToObject;
		HEAPSAFE_COPY_BEGIN_MEMORY_CONTROL_BLOCK(begin->stringInfo);
		begin->length = sizeOfObject;
		sHeapSafeMemoryControlBlock *end = (sHeapSafeMemoryControlBlock*)
							((unsigned char*)pointerToObject + sizeOfObject + HEAPSAFE_ALLOC_RESERVE +
							 sizeof(sHeapSafeMemoryControlBlock));
		HEAPSAFE_COPY_END_MEMORY_CONTROL_BLOCK(end->stringInfo);
		end->length = sizeOfObject;
	}
	return((unsigned char*)pointerToObject +
	       (HeapSafeCheck & _HeapSafeErrorBeginEnd ?
		 sizeof(sHeapSafeMemoryControlBlock) :
		 0));
}

inline void heapsafe_free(void *pointerToObject) {
	extern unsigned int HeapSafeCheck;
	if(!pointerToObject) {
		return;
	}
	int error = 0;
	bool findBeginMemoryBlock = false;
	sHeapSafeMemoryControlBlock *beginMemoryBlock = NULL;
	if(HeapSafeCheck & _HeapSafeErrorBeginEnd) {
		beginMemoryBlock = (sHeapSafeMemoryControlBlock*)((unsigned char*)pointerToObject - sizeof(sHeapSafeMemoryControlBlock));
		if(HEAPSAFE_CMP_BEGIN_MEMORY_CONTROL_BLOCK(beginMemoryBlock->stringInfo)) {
			findBeginMemoryBlock = true;
			sHeapSafeMemoryControlBlock *end = (sHeapSafeMemoryControlBlock*)((unsigned char*)pointerToObject + beginMemoryBlock->length + HEAPSAFE_ALLOC_RESERVE);
			if(!HEAPSAFE_CMP_END_MEMORY_CONTROL_BLOCK(end->stringInfo)) {
				error = _HeapSafeErrorBeginEnd;
			} else if(HeapSafeCheck & _HeapSafeErrorFillFF) {
				memset(pointerToObject, 0xFF, beginMemoryBlock->length);
			}
		} else if(HeapSafeCheck & _HeapSafeErrorFreed&&
			  HEAPSAFE_CMP_FREED_MEMORY_CONTROL_BLOCK(beginMemoryBlock->stringInfo)) {
			error = _HeapSafeErrorFreed;
		} else {
			error = _HeapSafeErrorBeginEnd;
		}
	}
	if(HeapSafeCheck & _HeapSafeErrorAllocReserve &&
           findBeginMemoryBlock && !error) {
		unsigned char *allocReserve = (unsigned char*)pointerToObject + beginMemoryBlock->length;
		int i;
		for(i = 0; i < HEAPSAFE_ALLOC_RESERVE && allocReserve[i] == (HeapSafeCheck & _HeapSafeErrorFillFF ? 0xFF : 0); i++);
		if(i<HEAPSAFE_ALLOC_RESERVE) {
			error = _HeapSafeErrorAllocReserve;
		}
        }
	if(!error) {
		try {
			if(findBeginMemoryBlock && beginMemoryBlock) {
				HEAPSAFE_COPY_FREED_MEMORY_CONTROL_BLOCK(beginMemoryBlock->stringInfo);
			}
			_heapsafe_free(findBeginMemoryBlock && beginMemoryBlock ? (void*)beginMemoryBlock : (void*)pointerToObject);
		}
		catch(...) {
			if(HeapSafeCheck & _HeapSafeErrorInAllocFce) {
				error = _HeapSafeErrorInAllocFce;
			}
		}
	}
	if(error) {
		HeapSafeAllocError(error);
	}
}


void * operator new(size_t sizeOfObject) {
	return(HeapSafeCheck ?
		heapsafe_alloc(sizeOfObject) :
		_heapsafe_alloc(sizeOfObject));
}

void * operator new[](size_t sizeOfObject) {
	return(HeapSafeCheck ?
		heapsafe_alloc(sizeOfObject) :
		_heapsafe_alloc(sizeOfObject));
}

void operator delete(void *pointerToObject) {
	if(HeapSafeCheck)
	 heapsafe_free(pointerToObject);
	else
	 _heapsafe_free(pointerToObject);
}

void operator delete[](void *pointerToObject) {
	if(HeapSafeCheck)
	 heapsafe_free(pointerToObject);
	else
	 _heapsafe_free(pointerToObject);
}


void HeapSafeAllocError(int error) {
	if(error) {
		const char *errorString =
			error & _HeapSafeErrorBeginEnd ?
				"Cannot find begin of memory block or corrupt end of memory block." :
			error & _HeapSafeErrorFreed ?
				"Memory block is freed." :
			error & _HeapSafeErrorAllocReserve ?
				"Using alloc reserve." :
			error & _HeapSafeErrorInHeap ?
				"Heap corrupted." :
			error & _HeapSafeErrorInAllocFce ?
				"Error in allocation function." :
			error & _HeapSafeErrorNotEnoughMemory ?
				"Not enough memory." :
				NULL;
		if(errorString) {
			syslog(LOG_ERR, "HEAPSAFE ALLOCATION ERROR: %s", errorString);
		}
	}
}

void HeapSafeMemcpyError(const char *errorString, const char *file, unsigned int line) {
	if(errorString) {
		syslog(LOG_ERR, "HEAPSAFE MEMCPY ERROR: %s - %s:%d", errorString,
		       file ? file : "unknown source file", line);
	}
}

void HeapSafeMemsetError(const char *errorString, const char *file, unsigned int line) {
	if(errorString) {
		syslog(LOG_ERR, "HEAPSAFE MEMSET ERROR: %s - %s:%d", errorString,
		       file ? file : "unknown source file", line);
	}
}