diff options
Diffstat (limited to 'src/VBox/Runtime/common/ldr/ldrELF.cpp')
| -rw-r--r-- | src/VBox/Runtime/common/ldr/ldrELF.cpp | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/ldr/ldrELF.cpp b/src/VBox/Runtime/common/ldr/ldrELF.cpp new file mode 100644 index 00000000..9ce0830b --- /dev/null +++ b/src/VBox/Runtime/common/ldr/ldrELF.cpp @@ -0,0 +1,188 @@ +/* $Id: ldrELF.cpp $ */ +/** @file + * IPRT - Binary Image Loader, Executable and Linker Format (ELF). + */ + +/* + * Copyright (C) 2006-2020 Oracle Corporation + * + * This file is part of VirtualBox Open Source Edition (OSE), as + * available from http://www.virtualbox.org. This file is free software; + * you can redistribute it and/or modify it under the terms of the GNU + * General Public License (GPL) as published by the Free Software + * Foundation, in version 2 as it comes in the "COPYING" file of the + * VirtualBox OSE distribution. VirtualBox OSE is distributed in the + * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL) only, as it comes in the "COPYING.CDDL" file of the + * VirtualBox OSE distribution, in which case the provisions of the + * CDDL are applicable instead of those of the GPL. + * + * You may elect to license modified versions of this file under the + * terms and conditions of either the GPL or the CDDL or both. + */ + + +/********************************************************************************************************************************* +* Header Files * +*********************************************************************************************************************************/ +#define LOG_GROUP RTLOGGROUP_LDR +#include <iprt/ldr.h> +#include "internal/iprt.h" + +#include <iprt/alloc.h> +#include <iprt/assert.h> +#include <iprt/dbg.h> +#include <iprt/string.h> +#include <iprt/log.h> +#include <iprt/err.h> +#include <iprt/formats/elf32.h> +#include <iprt/formats/elf64.h> +#include <iprt/formats/elf-i386.h> +#include <iprt/formats/elf-amd64.h> +#include "internal/ldr.h" +#include "internal/dbgmod.h" + + + +/********************************************************************************************************************************* +* Defined Constants And Macros * +*********************************************************************************************************************************/ +/** Finds an ELF symbol table string. */ +#define ELF_STR(pHdrs, iStr) ((pHdrs)->Rel.pStr + (iStr)) +/** Finds an ELF symbol table string. */ +#define ELF_DYN_STR(pHdrs, iStr) ((pHdrs)->Dyn.pStr + (iStr)) +/** Finds an ELF section header string. */ +#define ELF_SH_STR(pHdrs, iStr) ((pHdrs)->pShStr + (iStr)) + + + +/********************************************************************************************************************************* +* Internal Functions * +*********************************************************************************************************************************/ +#ifdef LOG_ENABLED +static const char *rtldrElfGetShdrType(uint32_t iType); +static const char *rtldrElfGetPhdrType(uint32_t iType); +#endif + + +/* Select ELF mode and include the template. */ +#define ELF_MODE 32 +#define Elf_Reloc Elf_Rel +#include "ldrELFRelocatable.cpp.h" +#undef ELF_MODE +#undef Elf_Reloc + + +#define ELF_MODE 64 +#define Elf_Reloc Elf_Rela +#include "ldrELFRelocatable.cpp.h" +#undef ELF_MODE +#undef Elf_Reloc + + +#ifdef LOG_ENABLED + +/** + * Gets the section type. + * + * @returns Pointer to read only string. + * @param iType The section type index. + */ +static const char *rtldrElfGetShdrType(uint32_t iType) +{ + switch (iType) + { + RT_CASE_RET_STR(SHT_NULL); + RT_CASE_RET_STR(SHT_PROGBITS); + RT_CASE_RET_STR(SHT_SYMTAB); + RT_CASE_RET_STR(SHT_STRTAB); + RT_CASE_RET_STR(SHT_RELA); + RT_CASE_RET_STR(SHT_HASH); + RT_CASE_RET_STR(SHT_DYNAMIC); + RT_CASE_RET_STR(SHT_NOTE); + RT_CASE_RET_STR(SHT_NOBITS); + RT_CASE_RET_STR(SHT_REL); + RT_CASE_RET_STR(SHT_SHLIB); + RT_CASE_RET_STR(SHT_DYNSYM); + default: + return ""; + } +} + +/** + * Gets the program header type. + * + * @returns Pointer to read only string. + * @param iType The section type index. + */ +static const char *rtldrElfGetPhdrType(uint32_t iType) +{ + switch (iType) + { + RT_CASE_RET_STR(PT_NULL); + RT_CASE_RET_STR(PT_LOAD); + RT_CASE_RET_STR(PT_DYNAMIC); + RT_CASE_RET_STR(PT_INTERP); + RT_CASE_RET_STR(PT_NOTE); + RT_CASE_RET_STR(PT_SHLIB); + RT_CASE_RET_STR(PT_PHDR); + RT_CASE_RET_STR(PT_TLS); + RT_CASE_RET_STR(PT_GNU_EH_FRAME); + RT_CASE_RET_STR(PT_GNU_STACK); + RT_CASE_RET_STR(PT_GNU_RELRO); + RT_CASE_RET_STR(PT_GNU_PROPERTY); + default: + return ""; + } +} + +#endif /* LOG_ENABLED*/ + + +/** + * Open an ELF image. + * + * @returns iprt status code. + * @param pReader The loader reader instance which will provide the raw image bits. + * @param fFlags Reserved, MBZ. + * @param enmArch Architecture specifier. + * @param phLdrMod Where to store the handle. + * @param pErrInfo Where to return extended error information. Optional. + */ +DECLHIDDEN(int) rtldrELFOpen(PRTLDRREADER pReader, uint32_t fFlags, RTLDRARCH enmArch, PRTLDRMOD phLdrMod, PRTERRINFO pErrInfo) +{ + const char *pszLogName = pReader->pfnLogName(pReader); NOREF(pszLogName); + + /* + * Read the ident to decide if this is 32-bit or 64-bit + * and worth dealing with. + */ + uint8_t e_ident[EI_NIDENT]; + int rc = pReader->pfnRead(pReader, &e_ident, sizeof(e_ident), 0); + if (RT_FAILURE(rc)) + return rc; + + if ( e_ident[EI_MAG0] != ELFMAG0 + || e_ident[EI_MAG1] != ELFMAG1 + || e_ident[EI_MAG2] != ELFMAG2 + || e_ident[EI_MAG3] != ELFMAG3 + || ( e_ident[EI_CLASS] != ELFCLASS32 + && e_ident[EI_CLASS] != ELFCLASS64) + ) + return RTERRINFO_LOG_SET_F(pErrInfo, VERR_BAD_EXE_FORMAT, + "%s: Unsupported/invalid ident %.*Rhxs", pszLogName, sizeof(e_ident), e_ident); + + if (e_ident[EI_DATA] != ELFDATA2LSB) + return RTERRINFO_LOG_SET_F(pErrInfo, VERR_LDRELF_ODD_ENDIAN, + "%s: ELF endian %x is unsupported", pszLogName, e_ident[EI_DATA]); + + if (e_ident[EI_CLASS] == ELFCLASS32) + rc = rtldrELF32Open(pReader, fFlags, enmArch, phLdrMod, pErrInfo); + else + rc = rtldrELF64Open(pReader, fFlags, enmArch, phLdrMod, pErrInfo); + return rc; +} + |