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/* $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;
}
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