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
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
|
/*++
Copyright (c) 1991 Microsoft Corporation
Module Name:
imagedir.c
Abstract:
The module contains the code to translate an image directory type to
the address of the data for that entry.
Author:
Steve Wood (stevewo) 18-Aug-1989
Environment:
User Mode or Kernel Mode
Revision History:
--*/
#include "ntrtlp.h"
PIMAGE_NT_HEADERS
RtlImageNtHeader (
IN PVOID Base
)
/*++
Routine Description:
This function returns the address of the NT Header.
Arguments:
Base - Supplies the base of the image.
Return Value:
Returns the address of the NT Header.
--*/
{
PIMAGE_NT_HEADERS NtHeaders;
if (Base != NULL && Base != (PVOID)-1) {
try {
if (((PIMAGE_DOS_HEADER)Base)->e_magic == IMAGE_DOS_SIGNATURE) {
NtHeaders = (PIMAGE_NT_HEADERS)((PCHAR)Base + ((PIMAGE_DOS_HEADER)Base)->e_lfanew);
if (NtHeaders->Signature == IMAGE_NT_SIGNATURE) {
return NtHeaders;
}
}
}
except(EXCEPTION_EXECUTE_HANDLER) {
return NULL;
}
}
return NULL;
}
PIMAGE_SECTION_HEADER
RtlSectionTableFromVirtualAddress (
IN PIMAGE_NT_HEADERS NtHeaders,
IN PVOID Base,
IN PVOID Address
)
/*++
Routine Description:
This function locates a VirtualAddress within the image header
of a file that is mapped as a file and returns a pointer to the
section table entry for that virtual address
Arguments:
NtHeaders - Supplies the pointer to the image or data file.
Base - Supplies the base of the image or data file.
Address - Supplies the virtual address to locate.
Return Value:
NULL - The file does not contain data for the specified directory entry.
NON-NULL - Returns the pointer of the section entry containing the data.
--*/
{
ULONG i;
PIMAGE_SECTION_HEADER NtSection;
NtSection = IMAGE_FIRST_SECTION( NtHeaders );
for (i=0; i<NtHeaders->FileHeader.NumberOfSections; i++) {
if ((ULONG)Address >= NtSection->VirtualAddress &&
(ULONG)Address < NtSection->VirtualAddress + NtSection->SizeOfRawData
) {
return NtSection;
}
++NtSection;
}
return NULL;
}
PVOID
RtlAddressInSectionTable (
IN PIMAGE_NT_HEADERS NtHeaders,
IN PVOID Base,
IN PVOID Address
)
/*++
Routine Description:
This function locates a VirtualAddress within the image header
of a file that is mapped as a file and returns the seek address
of the data the Directory describes.
Arguments:
NtHeaders - Supplies the pointer to the image or data file.
Base - Supplies the base of the image or data file.
Address - Supplies the virtual address to locate.
Return Value:
NULL - The file does not contain data for the specified directory entry.
NON-NULL - Returns the address of the raw data the directory describes.
--*/
{
PIMAGE_SECTION_HEADER NtSection;
NtSection = RtlSectionTableFromVirtualAddress( NtHeaders,
Base,
Address
);
if (NtSection != NULL) {
return( (PVOID)((ULONG)Base + ((ULONG)Address - NtSection->VirtualAddress) + NtSection->PointerToRawData) );
}
else {
return( NULL );
}
}
PVOID
RtlImageDirectoryEntryToData (
IN PVOID Base,
IN BOOLEAN MappedAsImage,
IN USHORT DirectoryEntry,
OUT PULONG Size
)
/*++
Routine Description:
This function locates a Directory Entry within the image header
and returns either the virtual address or seek address of the
data the Directory describes.
Arguments:
Base - Supplies the base of the image or data file.
MappedAsImage - FALSE if the file is mapped as a data file.
- TRUE if the file is mapped as an image.
DirectoryEntry - Supplies the directory entry to locate.
Size - Return the size of the directory.
Return Value:
NULL - The file does not contain data for the specified directory entry.
NON-NULL - Returns the address of the raw data the directory describes.
--*/
{
ULONG i, DirectoryAddress;
PIMAGE_NT_HEADERS NtHeaders;
if ((ULONG)Base & 0x00000001) {
Base = (PVOID)((ULONG)Base & ~0x00000001);
MappedAsImage = FALSE;
}
NtHeaders = RtlImageNtHeader(Base);
if ((!NtHeaders) ||
(DirectoryEntry >= NtHeaders->OptionalHeader.NumberOfRvaAndSizes)) {
return( NULL );
}
if (!(DirectoryAddress = NtHeaders->OptionalHeader.DataDirectory[ DirectoryEntry ].VirtualAddress)) {
return( NULL );
}
*Size = NtHeaders->OptionalHeader.DataDirectory[ DirectoryEntry ].Size;
if (MappedAsImage || DirectoryAddress < NtHeaders->OptionalHeader.SizeOfHeaders) {
return( (PVOID)((ULONG)Base + DirectoryAddress) );
}
return( RtlAddressInSectionTable(NtHeaders, Base, (PVOID)DirectoryAddress ));
}
#if !defined(NTOS_KERNEL_RUNTIME) && !defined(BLDR_KERNEL_RUNTIME)
PIMAGE_SECTION_HEADER
RtlImageRvaToSection(
IN PIMAGE_NT_HEADERS NtHeaders,
IN PVOID Base,
IN ULONG Rva
)
/*++
Routine Description:
This function locates an RVA within the image header of a file
that is mapped as a file and returns a pointer to the section
table entry for that virtual address
Arguments:
NtHeaders - Supplies the pointer to the image or data file.
Base - Supplies the base of the image or data file. The image
was mapped as a data file.
Rva - Supplies the relative virtual address (RVA) to locate.
Return Value:
NULL - The RVA was not found within any of the sections of the image.
NON-NULL - Returns the pointer to the image section that contains
the RVA
--*/
{
ULONG i;
PIMAGE_SECTION_HEADER NtSection;
NtSection = IMAGE_FIRST_SECTION( NtHeaders );
for (i=0; i<NtHeaders->FileHeader.NumberOfSections; i++) {
if (Rva >= NtSection->VirtualAddress &&
Rva < NtSection->VirtualAddress + NtSection->SizeOfRawData
) {
return NtSection;
}
++NtSection;
}
return NULL;
}
PVOID
RtlImageRvaToVa(
IN PIMAGE_NT_HEADERS NtHeaders,
IN PVOID Base,
IN ULONG Rva,
IN OUT PIMAGE_SECTION_HEADER *LastRvaSection OPTIONAL
)
/*++
Routine Description:
This function locates an RVA within the image header of a file that
is mapped as a file and returns the virtual addrees of the
corresponding byte in the file.
Arguments:
NtHeaders - Supplies the pointer to the image or data file.
Base - Supplies the base of the image or data file. The image
was mapped as a data file.
Rva - Supplies the relative virtual address (RVA) to locate.
LastRvaSection - Optional parameter that if specified, points
to a variable that contains the last section value used for
the specified image to translate and RVA to a VA.
Return Value:
NULL - The file does not contain the specified RVA
NON-NULL - Returns the virtual addrees in the mapped file.
--*/
{
PIMAGE_SECTION_HEADER NtSection;
if (!ARGUMENT_PRESENT( LastRvaSection ) ||
(NtSection = *LastRvaSection) == NULL ||
Rva < NtSection->VirtualAddress ||
Rva >= NtSection->VirtualAddress + NtSection->SizeOfRawData
) {
NtSection = RtlImageRvaToSection( NtHeaders,
Base,
Rva
);
}
if (NtSection != NULL) {
if (LastRvaSection != NULL) {
*LastRvaSection = NtSection;
}
return (PVOID)((ULONG)Base +
(Rva - NtSection->VirtualAddress) +
NtSection->PointerToRawData
);
}
else {
return NULL;
}
}
#endif
|
