1 | /* $Id: ldrELF.cpp 57358 2015-08-14 15:16:38Z vboxsync $ */
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2 | /** @file
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3 | * IPRT - Binary Image Loader, Executable and Linker Format (ELF).
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2006-2015 Oracle Corporation
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8 | *
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9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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10 | * available from http://www.virtualbox.org. This file is free software;
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11 | * you can redistribute it and/or modify it under the terms of the GNU
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12 | * General Public License (GPL) as published by the Free Software
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13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | *
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17 | * The contents of this file may alternatively be used under the terms
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18 | * of the Common Development and Distribution License Version 1.0
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19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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20 | * VirtualBox OSE distribution, in which case the provisions of the
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21 | * CDDL are applicable instead of those of the GPL.
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22 | *
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23 | * You may elect to license modified versions of this file under the
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24 | * terms and conditions of either the GPL or the CDDL or both.
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25 | */
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26 |
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27 |
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28 | /*********************************************************************************************************************************
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29 | * Header Files *
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30 | *********************************************************************************************************************************/
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31 | #define LOG_GROUP RTLOGGROUP_LDR
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32 | #include <iprt/ldr.h>
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33 | #include "internal/iprt.h"
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34 |
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35 | #include <iprt/alloc.h>
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36 | #include <iprt/assert.h>
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37 | #include <iprt/string.h>
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38 | #include <iprt/log.h>
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39 | #include <iprt/err.h>
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40 | #include "internal/ldrELF32.h"
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41 | #include "internal/ldrELF64.h"
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42 | #include "internal/ldrELFi386.h"
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43 | #include "internal/ldrELFAmd64.h"
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44 | #include "internal/ldr.h"
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45 |
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46 |
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47 |
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48 | /*********************************************************************************************************************************
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49 | * Defined Constants And Macros *
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50 | *********************************************************************************************************************************/
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51 | /** Finds an ELF symbol table string. */
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52 | #define ELF_STR(pHdrs, iStr) ((pHdrs)->pStr + (iStr))
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53 | /** Finds an ELF section header string. */
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54 | #define ELF_SH_STR(pHdrs, iStr) ((pHdrs)->pShStr + (iStr))
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55 |
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56 |
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57 |
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58 | /*********************************************************************************************************************************
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59 | * Internal Functions *
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60 | *********************************************************************************************************************************/
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61 | #ifdef LOG_ENABLED
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62 | static const char *rtldrElfGetShdrType(uint32_t iType);
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63 | #endif
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64 |
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65 |
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66 | /* Select ELF mode and include the template. */
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67 | #define ELF_MODE 32
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68 | #define Elf_Reloc Elf_Rel
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69 | #include "ldrELFRelocatable.cpp.h"
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70 | #undef ELF_MODE
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71 | #undef Elf_Reloc
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72 |
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73 |
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74 | #define ELF_MODE 64
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75 | #define Elf_Reloc Elf_Rela
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76 | #include "ldrELFRelocatable.cpp.h"
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77 | #undef ELF_MODE
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78 | #undef Elf_Reloc
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79 |
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80 |
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81 | #ifdef LOG_ENABLED
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82 | /**
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83 | * Gets the section type.
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84 | *
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85 | * @returns Pointer to read only string.
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86 | * @param iType The section type index.
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87 | */
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88 | static const char *rtldrElfGetShdrType(uint32_t iType)
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89 | {
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90 | switch (iType)
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91 | {
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92 | case SHT_NULL: return "SHT_NULL";
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93 | case SHT_PROGBITS: return "SHT_PROGBITS";
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94 | case SHT_SYMTAB: return "SHT_SYMTAB";
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95 | case SHT_STRTAB: return "SHT_STRTAB";
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96 | case SHT_RELA: return "SHT_RELA";
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97 | case SHT_HASH: return "SHT_HASH";
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98 | case SHT_DYNAMIC: return "SHT_DYNAMIC";
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99 | case SHT_NOTE: return "SHT_NOTE";
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100 | case SHT_NOBITS: return "SHT_NOBITS";
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101 | case SHT_REL: return "SHT_REL";
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102 | case SHT_SHLIB: return "SHT_SHLIB";
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103 | case SHT_DYNSYM: return "SHT_DYNSYM";
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104 | default:
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105 | return "";
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106 | }
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107 | }
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108 | #endif
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109 |
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110 |
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111 | /**
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112 | * Open an ELF image.
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113 | *
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114 | * @returns iprt status code.
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115 | * @param pReader The loader reader instance which will provide the raw image bits.
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116 | * @param fFlags Reserved, MBZ.
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117 | * @param enmArch Architecture specifier.
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118 | * @param phLdrMod Where to store the handle.
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119 | * @param pErrInfo Where to return extended error information. Optional.
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120 | */
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121 | int rtldrELFOpen(PRTLDRREADER pReader, uint32_t fFlags, RTLDRARCH enmArch, PRTLDRMOD phLdrMod, PRTERRINFO pErrInfo)
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122 | {
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123 | const char *pszLogName = pReader->pfnLogName(pReader); NOREF(pszLogName);
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124 |
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125 | /*
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126 | * Read the ident to decide if this is 32-bit or 64-bit
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127 | * and worth dealing with.
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128 | */
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129 | uint8_t e_ident[EI_NIDENT];
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130 | int rc = pReader->pfnRead(pReader, &e_ident, sizeof(e_ident), 0);
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131 | if (RT_FAILURE(rc))
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132 | return rc;
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133 | if ( e_ident[EI_MAG0] != ELFMAG0
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134 | || e_ident[EI_MAG1] != ELFMAG1
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135 | || e_ident[EI_MAG2] != ELFMAG2
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136 | || e_ident[EI_MAG3] != ELFMAG3
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137 | || ( e_ident[EI_CLASS] != ELFCLASS32
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138 | && e_ident[EI_CLASS] != ELFCLASS64)
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139 | )
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140 | {
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141 | Log(("RTLdrELF: %s: Unsupported/invalid ident %.*Rhxs\n", pszLogName, sizeof(e_ident), e_ident));
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142 | return VERR_BAD_EXE_FORMAT;
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143 | }
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144 | if (e_ident[EI_DATA] != ELFDATA2LSB)
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145 | {
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146 | Log(("RTLdrELF: %s: ELF endian %x is unsupported\n", pszLogName, e_ident[EI_DATA]));
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147 | return VERR_LDRELF_ODD_ENDIAN;
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148 | }
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149 | if (e_ident[EI_CLASS] == ELFCLASS32)
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150 | rc = rtldrELF32Open(pReader, fFlags, enmArch, phLdrMod);
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151 | else
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152 | rc = rtldrELF64Open(pReader, fFlags, enmArch, phLdrMod);
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153 | return rc;
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154 | }
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155 |
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