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
|
/*
* Copyright (C) 2012 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef LINKER_PHDR_H
#define LINKER_PHDR_H
/* Declarations related to the ELF program header table and segments.
*
* The design goal is to provide an API that is as close as possible
* to the ELF spec, and does not depend on linker-specific data
* structures (e.g. the exact layout of struct soinfo).
*/
#include "linker.h"
class ElfReader {
public:
ElfReader(const char* name, int fd);
~ElfReader();
bool Load();
size_t phdr_count() { return phdr_num_; }
Elf32_Addr load_start() { return reinterpret_cast<Elf32_Addr>(load_start_); }
Elf32_Addr load_size() { return load_size_; }
Elf32_Addr load_bias() { return load_bias_; }
const Elf32_Phdr* loaded_phdr() { return loaded_phdr_; }
private:
bool ReadElfHeader();
bool VerifyElfHeader();
bool ReadProgramHeader();
bool ReserveAddressSpace();
bool LoadSegments();
bool FindPhdr();
bool CheckPhdr(Elf32_Addr);
const char* name_;
int fd_;
Elf32_Ehdr header_;
size_t phdr_num_;
void* phdr_mmap_;
Elf32_Phdr* phdr_table_;
Elf32_Addr phdr_size_;
// First page of reserved address space.
void* load_start_;
// Size in bytes of reserved address space.
Elf32_Addr load_size_;
// Load bias.
Elf32_Addr load_bias_;
// Loaded phdr.
const Elf32_Phdr* loaded_phdr_;
};
size_t
phdr_table_get_load_size(const Elf32_Phdr* phdr_table,
size_t phdr_count,
Elf32_Addr* min_vaddr = NULL,
Elf32_Addr* max_vaddr = NULL);
int
phdr_table_protect_segments(const Elf32_Phdr* phdr_table,
int phdr_count,
Elf32_Addr load_bias);
int
phdr_table_unprotect_segments(const Elf32_Phdr* phdr_table,
int phdr_count,
Elf32_Addr load_bias);
int
phdr_table_protect_gnu_relro(const Elf32_Phdr* phdr_table,
int phdr_count,
Elf32_Addr load_bias);
#ifdef ANDROID_ARM_LINKER
int
phdr_table_get_arm_exidx(const Elf32_Phdr* phdr_table,
int phdr_count,
Elf32_Addr load_bias,
Elf32_Addr** arm_exidx,
unsigned* arm_exidix_count);
#endif
void
phdr_table_get_dynamic_section(const Elf32_Phdr* phdr_table,
int phdr_count,
Elf32_Addr load_bias,
Elf32_Dyn** dynamic,
size_t* dynamic_count,
Elf32_Word* dynamic_flags);
#endif /* LINKER_PHDR_H */
|
