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
|
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qelfparser_p.h"
#if defined (Q_OF_ELF) && defined(Q_CC_GNU)
#include "qlibrary_p.h"
#include <qdebug.h>
QT_BEGIN_NAMESPACE
// #define QELFPARSER_DEBUG 1
const char *QElfParser::parseSectionHeader(const char *data, ElfSectionHeader *sh)
{
sh->name = read<qelfword_t>(data);
data += sizeof(qelfword_t); // sh_name
sh->type = read<qelfword_t>(data);
data += sizeof(qelfword_t) // sh_type
+ sizeof(qelfaddr_t) // sh_flags
+ sizeof(qelfaddr_t); // sh_addr
sh->offset = read<qelfoff_t>(data);
data += sizeof(qelfoff_t); // sh_offset
sh->size = read<qelfoff_t>(data);
data += sizeof(qelfoff_t); // sh_size
return data;
}
int QElfParser::parse(const char *dataStart, ulong fdlen, const QString &library, QLibraryPrivate *lib, long *pos, ulong *sectionlen)
{
#if defined(QELFPARSER_DEBUG)
qDebug() << "QElfParser::parse " << library;
#endif
if (fdlen < 64){
if (lib)
lib->errorString = QLibrary::tr("'%1' is not an ELF object (%2)").arg(library, QLibrary::tr("file too small"));
return NotElf;
}
const char *data = dataStart;
if (qstrncmp(data, "\177ELF", 4) != 0) {
if (lib)
lib->errorString = QLibrary::tr("'%1' is not an ELF object").arg(library);
return NotElf;
}
// 32 or 64 bit
if (data[4] != 1 && data[4] != 2) {
if (lib)
lib->errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)").arg(library, QLibrary::tr("odd cpu architecture"));
return Corrupt;
}
m_bits = (data[4] << 5);
/* If you remove this check, to read ELF objects of a different arch, please make sure you modify the typedefs
to match the _plugin_ architecture.
*/
if ((sizeof(void*) == 4 && m_bits != 32) || (sizeof(void*) == 8 && m_bits != 64)) {
if (lib)
lib->errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)").arg(library, QLibrary::tr("wrong cpu architecture"));
return Corrupt;
}
// endian
if (data[5] == 0) {
if (lib)
lib->errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)").arg(library, QLibrary::tr("odd endianness"));
return Corrupt;
}
m_endian = (data[5] == 1 ? ElfLittleEndian : ElfBigEndian);
data += 16 // e_ident
+ sizeof(qelfhalf_t) // e_type
+ sizeof(qelfhalf_t) // e_machine
+ sizeof(qelfword_t) // e_version
+ sizeof(qelfaddr_t) // e_entry
+ sizeof(qelfoff_t); // e_phoff
qelfoff_t e_shoff = read<qelfoff_t> (data);
data += sizeof(qelfoff_t) // e_shoff
+ sizeof(qelfword_t); // e_flags
qelfhalf_t e_shsize = read<qelfhalf_t> (data);
if (e_shsize > fdlen) {
if (lib)
lib->errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)").arg(library, QLibrary::tr("unexpected e_shsize"));
return Corrupt;
}
data += sizeof(qelfhalf_t) // e_ehsize
+ sizeof(qelfhalf_t) // e_phentsize
+ sizeof(qelfhalf_t); // e_phnum
qelfhalf_t e_shentsize = read<qelfhalf_t> (data);
if (e_shentsize % 4){
if (lib)
lib->errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)").arg(library, QLibrary::tr("unexpected e_shentsize"));
return Corrupt;
}
data += sizeof(qelfhalf_t); // e_shentsize
qelfhalf_t e_shnum = read<qelfhalf_t> (data);
data += sizeof(qelfhalf_t); // e_shnum
qelfhalf_t e_shtrndx = read<qelfhalf_t> (data);
data += sizeof(qelfhalf_t); // e_shtrndx
if ((quint32)(e_shnum * e_shentsize) > fdlen) {
if (lib) {
const QString message =
QLibrary::tr("announced %n section(s), each %1 byte(s), exceed file size",
nullptr, int(e_shnum)).arg(e_shentsize);
lib->errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)").arg(library, message);
}
return Corrupt;
}
#if defined(QELFPARSER_DEBUG)
qDebug() << e_shnum << "sections starting at " << ("0x" + QByteArray::number(e_shoff, 16)).data() << "each" << e_shentsize << "bytes";
#endif
ElfSectionHeader strtab;
qulonglong soff = e_shoff + qelfword_t(e_shentsize) * qelfword_t(e_shtrndx);
if ((soff + e_shentsize) > fdlen || soff % 4 || soff == 0) {
if (lib)
lib->errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)")
.arg(library, QLibrary::tr("shstrtab section header seems to be at %1")
.arg(QString::number(soff, 16)));
return Corrupt;
}
parseSectionHeader(dataStart + soff, &strtab);
m_stringTableFileOffset = strtab.offset;
if ((quint32)(m_stringTableFileOffset + e_shentsize) >= fdlen || m_stringTableFileOffset == 0) {
if (lib)
lib->errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)")
.arg(library, QLibrary::tr("string table seems to be at %1")
.arg(QString::number(soff, 16)));
return Corrupt;
}
#if defined(QELFPARSER_DEBUG)
qDebug(".shstrtab at 0x%s", QByteArray::number(m_stringTableFileOffset, 16).data());
#endif
const char *s = dataStart + e_shoff;
for (int i = 0; i < e_shnum; ++i) {
ElfSectionHeader sh;
parseSectionHeader(s, &sh);
if (sh.name == 0) {
s += e_shentsize;
continue;
}
const char *shnam = dataStart + m_stringTableFileOffset + sh.name;
if (m_stringTableFileOffset + sh.name > fdlen) {
if (lib)
lib->errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)")
.arg(library, QLibrary::tr("section name %1 of %2 behind end of file")
.arg(i).arg(e_shnum));
return Corrupt;
}
#if defined(QELFPARSER_DEBUG)
qDebug() << "++++" << i << shnam;
#endif
if (qstrcmp(shnam, ".qtmetadata") == 0 || qstrcmp(shnam, ".rodata") == 0) {
if (!(sh.type & 0x1)) {
if (shnam[1] == 'r') {
if (lib)
lib->errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)")
.arg(library, QLibrary::tr("empty .rodata. not a library."));
return Corrupt;
}
#if defined(QELFPARSER_DEBUG)
qDebug()<<"section is not program data. skipped.";
#endif
s += e_shentsize;
continue;
}
if (sh.offset == 0 || (sh.offset + sh.size) > fdlen || sh.size < 1) {
if (lib)
lib->errorString = QLibrary::tr("'%1' is an invalid ELF object (%2)")
.arg(library, QLibrary::tr("missing section data. This is not a library."));
return Corrupt;
}
*pos = sh.offset;
*sectionlen = sh.size - 1;
if (shnam[1] == 'q')
return QtMetaDataSection;
}
s += e_shentsize;
}
return NoQtSection;
}
QT_END_NAMESPACE
#endif // defined(Q_OF_ELF) && defined(Q_CC_GNU)
|
