| 1 | /* $Id: ldrELF.cpp 85501 2020-07-29 09:10:35Z 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) 2006-2020 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/dbg.h>
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| 38 | #include <iprt/string.h>
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| 39 | #include <iprt/log.h>
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| 40 | #include <iprt/err.h>
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| 41 | #include <iprt/formats/elf32.h>
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| 42 | #include <iprt/formats/elf64.h>
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| 43 | #include <iprt/formats/elf-i386.h>
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| 44 | #include <iprt/formats/elf-amd64.h>
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| 45 | #include "internal/ldr.h"
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| 46 | #include "internal/dbgmod.h"
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| 47 |
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| 48 |
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| 49 |
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| 50 | /*********************************************************************************************************************************
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| 51 | * Defined Constants And Macros *
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| 52 | *********************************************************************************************************************************/
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| 53 | /** Finds an ELF symbol table string. */
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| 54 | #define ELF_STR(pHdrs, iStr) ((pHdrs)->Rel.pStr + (iStr))
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| 55 | /** Finds an ELF symbol table string. */
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| 56 | #define ELF_DYN_STR(pHdrs, iStr) ((pHdrs)->Dyn.pStr + (iStr))
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| 57 | /** Finds an ELF section header string. */
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| 58 | #define ELF_SH_STR(pHdrs, iStr) ((pHdrs)->pShStr + (iStr))
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| 59 |
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| 60 |
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| 61 |
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| 62 | /*********************************************************************************************************************************
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| 63 | * Internal Functions *
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| 64 | *********************************************************************************************************************************/
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| 65 | #ifdef LOG_ENABLED
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| 66 | static const char *rtldrElfGetShdrType(uint32_t iType);
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| 67 | static const char *rtldrElfGetPhdrType(uint32_t iType);
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| 68 | #endif
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| 69 |
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| 70 |
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| 71 | /* Select ELF mode and include the template. */
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| 72 | #define ELF_MODE 32
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| 73 | #define Elf_Reloc Elf_Rel
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| 74 | #include "ldrELFRelocatable.cpp.h"
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| 75 | #undef ELF_MODE
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| 76 | #undef Elf_Reloc
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| 77 |
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| 78 |
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| 79 | #define ELF_MODE 64
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| 80 | #define Elf_Reloc Elf_Rela
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| 81 | #include "ldrELFRelocatable.cpp.h"
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| 82 | #undef ELF_MODE
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| 83 | #undef Elf_Reloc
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| 84 |
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| 85 |
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| 86 | #ifdef LOG_ENABLED
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| 87 |
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| 88 | /**
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| 89 | * Gets the section type.
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| 90 | *
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| 91 | * @returns Pointer to read only string.
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| 92 | * @param iType The section type index.
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| 93 | */
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| 94 | static const char *rtldrElfGetShdrType(uint32_t iType)
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| 95 | {
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| 96 | switch (iType)
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| 97 | {
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| 98 | RT_CASE_RET_STR(SHT_NULL);
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| 99 | RT_CASE_RET_STR(SHT_PROGBITS);
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| 100 | RT_CASE_RET_STR(SHT_SYMTAB);
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| 101 | RT_CASE_RET_STR(SHT_STRTAB);
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| 102 | RT_CASE_RET_STR(SHT_RELA);
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| 103 | RT_CASE_RET_STR(SHT_HASH);
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| 104 | RT_CASE_RET_STR(SHT_DYNAMIC);
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| 105 | RT_CASE_RET_STR(SHT_NOTE);
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| 106 | RT_CASE_RET_STR(SHT_NOBITS);
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| 107 | RT_CASE_RET_STR(SHT_REL);
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| 108 | RT_CASE_RET_STR(SHT_SHLIB);
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| 109 | RT_CASE_RET_STR(SHT_DYNSYM);
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| 110 | default:
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| 111 | return "";
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| 112 | }
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| 113 | }
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| 114 |
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| 115 | /**
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| 116 | * Gets the program header type.
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| 117 | *
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| 118 | * @returns Pointer to read only string.
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| 119 | * @param iType The section type index.
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| 120 | */
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| 121 | static const char *rtldrElfGetPhdrType(uint32_t iType)
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| 122 | {
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| 123 | switch (iType)
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| 124 | {
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| 125 | RT_CASE_RET_STR(PT_NULL);
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| 126 | RT_CASE_RET_STR(PT_LOAD);
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| 127 | RT_CASE_RET_STR(PT_DYNAMIC);
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| 128 | RT_CASE_RET_STR(PT_INTERP);
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| 129 | RT_CASE_RET_STR(PT_NOTE);
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| 130 | RT_CASE_RET_STR(PT_SHLIB);
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| 131 | RT_CASE_RET_STR(PT_PHDR);
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| 132 | RT_CASE_RET_STR(PT_TLS);
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| 133 | RT_CASE_RET_STR(PT_GNU_EH_FRAME);
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| 134 | RT_CASE_RET_STR(PT_GNU_STACK);
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| 135 | RT_CASE_RET_STR(PT_GNU_RELRO);
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| 136 | RT_CASE_RET_STR(PT_GNU_PROPERTY);
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| 137 | default:
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| 138 | return "";
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| 139 | }
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| 140 | }
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| 141 |
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| 142 | #endif /* LOG_ENABLED*/
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| 143 |
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| 144 |
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| 145 | /**
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| 146 | * Open an ELF image.
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| 147 | *
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| 148 | * @returns iprt status code.
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| 149 | * @param pReader The loader reader instance which will provide the raw image bits.
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| 150 | * @param fFlags Reserved, MBZ.
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| 151 | * @param enmArch Architecture specifier.
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| 152 | * @param phLdrMod Where to store the handle.
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| 153 | * @param pErrInfo Where to return extended error information. Optional.
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| 154 | */
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| 155 | DECLHIDDEN(int) rtldrELFOpen(PRTLDRREADER pReader, uint32_t fFlags, RTLDRARCH enmArch, PRTLDRMOD phLdrMod, PRTERRINFO pErrInfo)
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| 156 | {
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| 157 | const char *pszLogName = pReader->pfnLogName(pReader); NOREF(pszLogName);
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| 158 |
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| 159 | /*
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| 160 | * Read the ident to decide if this is 32-bit or 64-bit
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| 161 | * and worth dealing with.
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| 162 | */
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| 163 | uint8_t e_ident[EI_NIDENT];
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| 164 | int rc = pReader->pfnRead(pReader, &e_ident, sizeof(e_ident), 0);
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| 165 | if (RT_FAILURE(rc))
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| 166 | return rc;
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| 167 |
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| 168 | if ( e_ident[EI_MAG0] != ELFMAG0
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| 169 | || e_ident[EI_MAG1] != ELFMAG1
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| 170 | || e_ident[EI_MAG2] != ELFMAG2
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| 171 | || e_ident[EI_MAG3] != ELFMAG3
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| 172 | || ( e_ident[EI_CLASS] != ELFCLASS32
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| 173 | && e_ident[EI_CLASS] != ELFCLASS64)
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| 174 | )
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| 175 | return RTERRINFO_LOG_SET_F(pErrInfo, VERR_BAD_EXE_FORMAT,
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| 176 | "%s: Unsupported/invalid ident %.*Rhxs", pszLogName, sizeof(e_ident), e_ident);
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| 177 |
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| 178 | if (e_ident[EI_DATA] != ELFDATA2LSB)
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| 179 | return RTERRINFO_LOG_SET_F(pErrInfo, VERR_LDRELF_ODD_ENDIAN,
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| 180 | "%s: ELF endian %x is unsupported", pszLogName, e_ident[EI_DATA]);
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| 181 |
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| 182 | if (e_ident[EI_CLASS] == ELFCLASS32)
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| 183 | rc = rtldrELF32Open(pReader, fFlags, enmArch, phLdrMod, pErrInfo);
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| 184 | else
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| 185 | rc = rtldrELF64Open(pReader, fFlags, enmArch, phLdrMod, pErrInfo);
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| 186 | return rc;
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| 187 | }
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| 188 |
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