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Diffstat (limited to '')
| -rw-r--r-- | src/VBox/Runtime/common/ldr/ldrELFRelocatable.cpp.h | 2077 |
1 files changed, 2077 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/ldr/ldrELFRelocatable.cpp.h b/src/VBox/Runtime/common/ldr/ldrELFRelocatable.cpp.h new file mode 100644 index 00000000..70c3f38d --- /dev/null +++ b/src/VBox/Runtime/common/ldr/ldrELFRelocatable.cpp.h @@ -0,0 +1,2077 @@ +/* $Id: ldrELFRelocatable.cpp.h $ */ +/** @file + * IPRT - Binary Image Loader, Template for ELF Relocatable Images. + */ + +/* + * Copyright (C) 2006-2019 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. + */ + + +/******************************************************************************* +* Defined Constants And Macros * +*******************************************************************************/ +#if ELF_MODE == 32 +#define RTLDRELF_NAME(name) rtldrELF32##name +#define RTLDRELF_SUFF(name) name##32 +#define RTLDRELF_MID(pre,suff) pre##32##suff +#define FMT_ELF_ADDR "%08RX32" +#define FMT_ELF_HALF "%04RX16" +#define FMT_ELF_OFF "%08RX32" +#define FMT_ELF_SIZE "%08RX32" +#define FMT_ELF_SWORD "%RI32" +#define FMT_ELF_WORD "%08RX32" +#define FMT_ELF_XWORD "%08RX32" +#define FMT_ELF_SXWORD "%RI32" + +#elif ELF_MODE == 64 +#define RTLDRELF_NAME(name) rtldrELF64##name +#define RTLDRELF_SUFF(name) name##64 +#define RTLDRELF_MID(pre,suff) pre##64##suff +#define FMT_ELF_ADDR "%016RX64" +#define FMT_ELF_HALF "%04RX16" +#define FMT_ELF_SHALF "%RI16" +#define FMT_ELF_OFF "%016RX64" +#define FMT_ELF_SIZE "%016RX64" +#define FMT_ELF_SWORD "%RI32" +#define FMT_ELF_WORD "%08RX32" +#define FMT_ELF_XWORD "%016RX64" +#define FMT_ELF_SXWORD "%RI64" +#endif + +#define Elf_Ehdr RTLDRELF_MID(Elf,_Ehdr) +#define Elf_Phdr RTLDRELF_MID(Elf,_Phdr) +#define Elf_Shdr RTLDRELF_MID(Elf,_Shdr) +#define Elf_Sym RTLDRELF_MID(Elf,_Sym) +#define Elf_Rel RTLDRELF_MID(Elf,_Rel) +#define Elf_Rela RTLDRELF_MID(Elf,_Rela) +#define Elf_Nhdr RTLDRELF_MID(Elf,_Nhdr) +#define Elf_Dyn RTLDRELF_MID(Elf,_Dyn) +#define Elf_Addr RTLDRELF_MID(Elf,_Addr) +#define Elf_Half RTLDRELF_MID(Elf,_Half) +#define Elf_Off RTLDRELF_MID(Elf,_Off) +#define Elf_Size RTLDRELF_MID(Elf,_Size) +#define Elf_Sword RTLDRELF_MID(Elf,_Sword) +#define Elf_Word RTLDRELF_MID(Elf,_Word) + +#define RTLDRMODELF RTLDRELF_MID(RTLDRMODELF,RT_NOTHING) +#define PRTLDRMODELF RTLDRELF_MID(PRTLDRMODELF,RT_NOTHING) + +#define ELF_R_SYM(info) RTLDRELF_MID(ELF,_R_SYM)(info) +#define ELF_R_TYPE(info) RTLDRELF_MID(ELF,_R_TYPE)(info) +#define ELF_R_INFO(sym, type) RTLDRELF_MID(ELF,_R_INFO)(sym, type) + +#define ELF_ST_BIND(info) RTLDRELF_MID(ELF,_ST_BIND)(info) + + + +/******************************************************************************* +* Structures and Typedefs * +*******************************************************************************/ +/** + * The ELF loader structure. + */ +typedef struct RTLDRMODELF +{ + /** Core module structure. */ + RTLDRMODINTERNAL Core; + /** Pointer to readonly mapping of the image bits. + * This mapping is provided by the pReader. */ + const void *pvBits; + + /** The ELF header. */ + Elf_Ehdr Ehdr; + /** Pointer to our copy of the section headers with sh_addr as RVAs. + * The virtual addresses in this array is the 0 based assignments we've given the image. + * Not valid if the image is DONE. */ + Elf_Shdr *paShdrs; + /** Unmodified section headers (allocated after paShdrs, so no need to free). + * Not valid if the image is DONE. */ + Elf_Shdr const *paOrgShdrs; + /** The size of the loaded image. */ + size_t cbImage; + + /** The image base address if it's an EXEC or DYN image. */ + Elf_Addr LinkAddress; + + /** The symbol section index. */ + unsigned iSymSh; + /** Number of symbols in the table. */ + unsigned cSyms; + /** Pointer to symbol table within RTLDRMODELF::pvBits. */ + const Elf_Sym *paSyms; + + /** The string section index. */ + unsigned iStrSh; + /** Size of the string table. */ + unsigned cbStr; + /** Pointer to string table within RTLDRMODELF::pvBits. */ + const char *pStr; + + /** Size of the section header string table. */ + unsigned cbShStr; + /** Pointer to section header string table within RTLDRMODELF::pvBits. */ + const char *pShStr; + + /** The '.eh_frame' section index. Zero if not searched for, ~0U if not found. */ + unsigned iShEhFrame; + /** The '.eh_frame_hdr' section index. Zero if not searched for, ~0U if not found. */ + unsigned iShEhFrameHdr; +} RTLDRMODELF, *PRTLDRMODELF; + + +/** + * Maps the image bits into memory and resolve pointers into it. + * + * @returns iprt status code. + * @param pModElf The ELF loader module instance data. + * @param fNeedsBits Set if we actually need the pvBits member. + * If we don't, we can simply read the string and symbol sections, thus saving memory. + */ +static int RTLDRELF_NAME(MapBits)(PRTLDRMODELF pModElf, bool fNeedsBits) +{ + NOREF(fNeedsBits); + if (pModElf->pvBits) + return VINF_SUCCESS; + int rc = pModElf->Core.pReader->pfnMap(pModElf->Core.pReader, &pModElf->pvBits); + if (RT_SUCCESS(rc)) + { + const uint8_t *pu8 = (const uint8_t *)pModElf->pvBits; + if (pModElf->iSymSh != ~0U) + pModElf->paSyms = (const Elf_Sym *)(pu8 + pModElf->paShdrs[pModElf->iSymSh].sh_offset); + if (pModElf->iStrSh != ~0U) + pModElf->pStr = (const char *)(pu8 + pModElf->paShdrs[pModElf->iStrSh].sh_offset); + pModElf->pShStr = (const char *)(pu8 + pModElf->paShdrs[pModElf->Ehdr.e_shstrndx].sh_offset); + } + return rc; +} + + +/* + * + * EXEC & DYN. + * EXEC & DYN. + * EXEC & DYN. + * EXEC & DYN. + * EXEC & DYN. + * + */ + + +/** + * Applies the fixups for a section in an executable image. + * + * @returns iprt status code. + * @param pModElf The ELF loader module instance data. + * @param BaseAddr The base address which the module is being fixedup to. + * @param pfnGetImport The callback function to use to resolve imports (aka unresolved externals). + * @param pvUser User argument to pass to the callback. + * @param SecAddr The section address. This is the address the relocations are relative to. + * @param cbSec The section size. The relocations must be inside this. + * @param pu8SecBaseR Where we read section bits from. + * @param pu8SecBaseW Where we write section bits to. + * @param pvRelocs Pointer to where we read the relocations from. + * @param cbRelocs Size of the relocations. + */ +static int RTLDRELF_NAME(RelocateSectionExecDyn)(PRTLDRMODELF pModElf, Elf_Addr BaseAddr, + PFNRTLDRIMPORT pfnGetImport, void *pvUser, + const Elf_Addr SecAddr, Elf_Size cbSec, + const uint8_t *pu8SecBaseR, uint8_t *pu8SecBaseW, + const void *pvRelocs, Elf_Size cbRelocs) +{ +#if ELF_MODE != 32 + NOREF(pu8SecBaseR); +#endif + + /* + * Iterate the relocations. + * The relocations are stored in an array of Elf32_Rel records and covers the entire relocation section. + */ + const Elf_Addr offDelta = BaseAddr - pModElf->LinkAddress; + const Elf_Reloc *paRels = (const Elf_Reloc *)pvRelocs; + const unsigned iRelMax = (unsigned)(cbRelocs / sizeof(paRels[0])); + AssertMsgReturn(iRelMax == cbRelocs / sizeof(paRels[0]), (FMT_ELF_SIZE "\n", cbRelocs / sizeof(paRels[0])), + VERR_IMAGE_TOO_BIG); + for (unsigned iRel = 0; iRel < iRelMax; iRel++) + { + /* + * Skip R_XXX_NONE entries early to avoid confusion in the symbol + * getter code. + */ +#if ELF_MODE == 32 + if (ELF_R_TYPE(paRels[iRel].r_info) == R_386_NONE) + continue; +#elif ELF_MODE == 64 + if (ELF_R_TYPE(paRels[iRel].r_info) == R_X86_64_NONE) + continue; +#endif + + /* + * Validate and find the symbol, resolve undefined ones. + */ + Elf_Size iSym = ELF_R_SYM(paRels[iRel].r_info); + if (iSym >= pModElf->cSyms) + { + AssertMsgFailed(("iSym=%d is an invalid symbol index!\n", iSym)); + return VERR_LDRELF_INVALID_SYMBOL_INDEX; + } + const Elf_Sym *pSym = &pModElf->paSyms[iSym]; + if (pSym->st_name >= pModElf->cbStr) + { + AssertMsgFailed(("iSym=%d st_name=%d str sh_size=%d\n", iSym, pSym->st_name, pModElf->cbStr)); + return VERR_LDRELF_INVALID_SYMBOL_NAME_OFFSET; + } + + Elf_Addr SymValue = 0; + if (pSym->st_shndx == SHN_UNDEF) + { + /* Try to resolve the symbol. */ + const char *pszName = ELF_STR(pModElf, pSym->st_name); + RTUINTPTR ExtValue; + int rc = pfnGetImport(&pModElf->Core, "", pszName, ~0U, &ExtValue, pvUser); + AssertMsgRCReturn(rc, ("Failed to resolve '%s' rc=%Rrc\n", pszName, rc), rc); + SymValue = (Elf_Addr)ExtValue; + AssertMsgReturn((RTUINTPTR)SymValue == ExtValue, ("Symbol value overflowed! '%s'\n", pszName), + VERR_SYMBOL_VALUE_TOO_BIG); + Log2(("rtldrELF: #%-3d - UNDEF " FMT_ELF_ADDR " '%s'\n", iSym, SymValue, pszName)); + } + else + { + AssertMsgReturn(pSym->st_shndx < pModElf->Ehdr.e_shnum || pSym->st_shndx == SHN_ABS, ("%#x\n", pSym->st_shndx), + VERR_LDRELF_INVALID_RELOCATION_OFFSET); +#if ELF_MODE == 64 + SymValue = pSym->st_value; +#endif + } + +#if ELF_MODE == 64 + /* Calc the value (indexes checked above; assumes SHN_UNDEF == 0). */ + Elf_Addr Value; + if (pSym->st_shndx < pModElf->Ehdr.e_shnum) + Value = SymValue + offDelta; + else /* SHN_ABS: */ + Value = SymValue + paRels[iRel].r_addend; +#endif + + /* + * Apply the fixup. + */ + AssertMsgReturn(paRels[iRel].r_offset < cbSec, (FMT_ELF_ADDR " " FMT_ELF_SIZE "\n", paRels[iRel].r_offset, cbSec), VERR_LDRELF_INVALID_RELOCATION_OFFSET); +#if ELF_MODE == 32 + const Elf_Addr *pAddrR = (const Elf_Addr *)(pu8SecBaseR + paRels[iRel].r_offset); /* Where to read the addend. */ +#endif + Elf_Addr *pAddrW = (Elf_Addr *)(pu8SecBaseW + paRels[iRel].r_offset); /* Where to write the fixup. */ + switch (ELF_R_TYPE(paRels[iRel].r_info)) + { +#if ELF_MODE == 32 + /* + * Absolute addressing. + */ + case R_386_32: + { + Elf_Addr Value; + if (pSym->st_shndx < pModElf->Ehdr.e_shnum) + Value = *pAddrR + offDelta; /* Simplified. */ + else if (pSym->st_shndx == SHN_ABS) + continue; /* Internal fixup, no need to apply it. */ + else if (pSym->st_shndx == SHN_UNDEF) + Value = SymValue + *pAddrR; + else + AssertFailedReturn(VERR_LDR_GENERAL_FAILURE); /** @todo SHN_COMMON */ + *(uint32_t *)pAddrW = Value; + Log4((FMT_ELF_ADDR": R_386_32 Value=" FMT_ELF_ADDR "\n", SecAddr + paRels[iRel].r_offset + BaseAddr, Value)); + break; + } + + /* + * PC relative addressing. + */ + case R_386_PC32: + { + Elf_Addr Value; + if (pSym->st_shndx < pModElf->Ehdr.e_shnum) + continue; /* Internal fixup, no need to apply it. */ + else if (pSym->st_shndx == SHN_ABS) + Value = *pAddrR + offDelta; /* Simplified. */ + else if (pSym->st_shndx == SHN_UNDEF) + { + const Elf_Addr SourceAddr = SecAddr + paRels[iRel].r_offset + BaseAddr; /* Where the source really is. */ + Value = SymValue + *(uint32_t *)pAddrR - SourceAddr; + *(uint32_t *)pAddrW = Value; + } + else + AssertFailedReturn(VERR_LDR_GENERAL_FAILURE); /** @todo SHN_COMMON */ + Log4((FMT_ELF_ADDR": R_386_PC32 Value=" FMT_ELF_ADDR "\n", SecAddr + paRels[iRel].r_offset + BaseAddr, Value)); + break; + } + +#elif ELF_MODE == 64 + + /* + * Absolute addressing + */ + case R_X86_64_64: + { + *(uint64_t *)pAddrW = Value; + Log4((FMT_ELF_ADDR": R_X86_64_64 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n", + SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue)); + break; + } + + /* + * Truncated 32-bit value (zero-extendedable to the 64-bit value). + */ + case R_X86_64_32: + { + *(uint32_t *)pAddrW = (uint32_t)Value; + Log4((FMT_ELF_ADDR": R_X86_64_32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n", + SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue)); + AssertMsgReturn((Elf_Addr)*(uint32_t *)pAddrW == SymValue, ("Value=" FMT_ELF_ADDR "\n", SymValue), + VERR_SYMBOL_VALUE_TOO_BIG); + break; + } + + /* + * Truncated 32-bit value (sign-extendedable to the 64-bit value). + */ + case R_X86_64_32S: + { + *(int32_t *)pAddrW = (int32_t)Value; + Log4((FMT_ELF_ADDR": R_X86_64_32S Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n", + SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue)); + AssertMsgReturn((Elf_Addr)*(int32_t *)pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG); /** @todo check the sign-extending here. */ + break; + } + + /* + * PC relative addressing. + */ + case R_X86_64_PC32: + case R_X86_64_PLT32: /* binutils commit 451875b4f976a527395e9303224c7881b65e12ed feature/regression. */ + { + const Elf_Addr SourceAddr = SecAddr + paRels[iRel].r_offset + BaseAddr; /* Where the source really is. */ + Value -= SourceAddr; + *(int32_t *)pAddrW = (int32_t)Value; + Log4((FMT_ELF_ADDR": R_X86_64_PC32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n", + SourceAddr, Value, SymValue)); + AssertMsgReturn((Elf_Addr)*(int32_t *)pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG); /** @todo check the sign-extending here. */ + break; + } +#endif + + default: + AssertMsgFailed(("Unknown relocation type: %d (iRel=%d iRelMax=%d)\n", + ELF_R_TYPE(paRels[iRel].r_info), iRel, iRelMax)); + return VERR_LDRELF_RELOCATION_NOT_SUPPORTED; + } + } + + return VINF_SUCCESS; +} + + + +/* + * + * REL + * REL + * REL + * REL + * REL + * + */ + +/** + * Get the symbol and symbol value. + * + * @returns iprt status code. + * @param pModElf The ELF loader module instance data. + * @param BaseAddr The base address which the module is being fixedup to. + * @param pfnGetImport The callback function to use to resolve imports (aka unresolved externals). + * @param pvUser User argument to pass to the callback. + * @param iSym The symbol to get. + * @param ppSym Where to store the symbol pointer on success. (read only) + * @param pSymValue Where to store the symbol value on success. + */ +static int RTLDRELF_NAME(Symbol)(PRTLDRMODELF pModElf, Elf_Addr BaseAddr, PFNRTLDRIMPORT pfnGetImport, void *pvUser, + Elf_Size iSym, const Elf_Sym **ppSym, Elf_Addr *pSymValue) +{ + /* + * Validate and find the symbol. + */ + if (iSym >= pModElf->cSyms) + { + AssertMsgFailed(("iSym=%d is an invalid symbol index!\n", iSym)); + return VERR_LDRELF_INVALID_SYMBOL_INDEX; + } + const Elf_Sym *pSym = &pModElf->paSyms[iSym]; + *ppSym = pSym; + + if (pSym->st_name >= pModElf->cbStr) + { + AssertMsgFailed(("iSym=%d st_name=%d str sh_size=%d\n", iSym, pSym->st_name, pModElf->cbStr)); + return VERR_LDRELF_INVALID_SYMBOL_NAME_OFFSET; + } + const char *pszName = ELF_STR(pModElf, pSym->st_name); + + /* + * Determine the symbol value. + * + * Symbols needs different treatment depending on which section their are in. + * Undefined and absolute symbols goes into special non-existing sections. + */ + switch (pSym->st_shndx) + { + /* + * Undefined symbol, needs resolving. + * + * Since ELF has no generic concept of importing from specific module (the OS/2 ELF format + * has but that's a OS extension and only applies to programs and dlls), we'll have to ask + * the resolver callback to do a global search. + */ + case SHN_UNDEF: + { + /* Try to resolve the symbol. */ + RTUINTPTR Value; + int rc = pfnGetImport(&pModElf->Core, "", pszName, ~0U, &Value, pvUser); + if (RT_FAILURE(rc)) + { + AssertMsgFailed(("Failed to resolve '%s' rc=%Rrc\n", pszName, rc)); + return rc; + } + *pSymValue = (Elf_Addr)Value; + if ((RTUINTPTR)*pSymValue != Value) + { + AssertMsgFailed(("Symbol value overflowed! '%s'\n", pszName)); + return VERR_SYMBOL_VALUE_TOO_BIG; + } + + Log2(("rtldrELF: #%-3d - UNDEF " FMT_ELF_ADDR " '%s'\n", iSym, *pSymValue, pszName)); + break; + } + + /* + * Absolute symbols needs no fixing since they are, well, absolute. + */ + case SHN_ABS: + *pSymValue = pSym->st_value; + Log2(("rtldrELF: #%-3d - ABS " FMT_ELF_ADDR " '%s'\n", iSym, *pSymValue, pszName)); + break; + + /* + * All other symbols are addressed relative to their section and need to be fixed up. + */ + default: + if (pSym->st_shndx >= pModElf->Ehdr.e_shnum) + { + /* what about common symbols? */ + AssertMsg(pSym->st_shndx < pModElf->Ehdr.e_shnum, + ("iSym=%d st_shndx=%d e_shnum=%d pszName=%s\n", iSym, pSym->st_shndx, pModElf->Ehdr.e_shnum, pszName)); + return VERR_BAD_EXE_FORMAT; + } + *pSymValue = pSym->st_value + pModElf->paShdrs[pSym->st_shndx].sh_addr + BaseAddr; + Log2(("rtldrELF: #%-3d - %5d " FMT_ELF_ADDR " '%s'\n", iSym, pSym->st_shndx, *pSymValue, pszName)); + break; + } + + return VINF_SUCCESS; +} + + +/** + * Applies the fixups for a sections. + * + * @returns iprt status code. + * @param pModElf The ELF loader module instance data. + * @param BaseAddr The base address which the module is being fixedup to. + * @param pfnGetImport The callback function to use to resolve imports (aka unresolved externals). + * @param pvUser User argument to pass to the callback. + * @param SecAddr The section address. This is the address the relocations are relative to. + * @param cbSec The section size. The relocations must be inside this. + * @param pu8SecBaseR Where we read section bits from. + * @param pu8SecBaseW Where we write section bits to. + * @param pvRelocs Pointer to where we read the relocations from. + * @param cbRelocs Size of the relocations. + */ +static int RTLDRELF_NAME(RelocateSection)(PRTLDRMODELF pModElf, Elf_Addr BaseAddr, PFNRTLDRIMPORT pfnGetImport, void *pvUser, + const Elf_Addr SecAddr, Elf_Size cbSec, const uint8_t *pu8SecBaseR, uint8_t *pu8SecBaseW, + const void *pvRelocs, Elf_Size cbRelocs) +{ +#if ELF_MODE != 32 + NOREF(pu8SecBaseR); +#endif + + /* + * Iterate the relocations. + * The relocations are stored in an array of Elf32_Rel records and covers the entire relocation section. + */ + const Elf_Reloc *paRels = (const Elf_Reloc *)pvRelocs; + const unsigned iRelMax = (unsigned)(cbRelocs / sizeof(paRels[0])); + AssertMsgReturn(iRelMax == cbRelocs / sizeof(paRels[0]), (FMT_ELF_SIZE "\n", cbRelocs / sizeof(paRels[0])), VERR_IMAGE_TOO_BIG); + for (unsigned iRel = 0; iRel < iRelMax; iRel++) + { + /* + * Skip R_XXX_NONE entries early to avoid confusion in the symbol + * getter code. + */ +#if ELF_MODE == 32 + if (ELF_R_TYPE(paRels[iRel].r_info) == R_386_NONE) + continue; +#elif ELF_MODE == 64 + if (ELF_R_TYPE(paRels[iRel].r_info) == R_X86_64_NONE) + continue; +#endif + + + /* + * Get the symbol. + */ + const Elf_Sym *pSym = NULL; /* shut up gcc */ + Elf_Addr SymValue = 0; /* shut up gcc-4 */ + int rc = RTLDRELF_NAME(Symbol)(pModElf, BaseAddr, pfnGetImport, pvUser, ELF_R_SYM(paRels[iRel].r_info), &pSym, &SymValue); + if (RT_FAILURE(rc)) + return rc; + + Log3(("rtldrELF: " FMT_ELF_ADDR " %02x %06x - " FMT_ELF_ADDR " %3d %02x %s\n", + paRels[iRel].r_offset, ELF_R_TYPE(paRels[iRel].r_info), (unsigned)ELF_R_SYM(paRels[iRel].r_info), + SymValue, (unsigned)pSym->st_shndx, pSym->st_info, ELF_STR(pModElf, pSym->st_name))); + + /* + * Apply the fixup. + */ + AssertMsgReturn(paRels[iRel].r_offset < cbSec, (FMT_ELF_ADDR " " FMT_ELF_SIZE "\n", paRels[iRel].r_offset, cbSec), VERR_LDRELF_INVALID_RELOCATION_OFFSET); +#if ELF_MODE == 32 + const Elf_Addr *pAddrR = (const Elf_Addr *)(pu8SecBaseR + paRels[iRel].r_offset); /* Where to read the addend. */ +#endif + Elf_Addr *pAddrW = (Elf_Addr *)(pu8SecBaseW + paRels[iRel].r_offset); /* Where to write the fixup. */ + switch (ELF_R_TYPE(paRels[iRel].r_info)) + { +#if ELF_MODE == 32 + /* + * Absolute addressing. + */ + case R_386_32: + { + const Elf_Addr Value = SymValue + *pAddrR; + *(uint32_t *)pAddrW = Value; + Log4((FMT_ELF_ADDR": R_386_32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n", + SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue)); + break; + } + + /* + * PC relative addressing. + */ + case R_386_PC32: + { + const Elf_Addr SourceAddr = SecAddr + paRels[iRel].r_offset + BaseAddr; /* Where the source really is. */ + const Elf_Addr Value = SymValue + *(uint32_t *)pAddrR - SourceAddr; + *(uint32_t *)pAddrW = Value; + Log4((FMT_ELF_ADDR": R_386_PC32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n", + SourceAddr, Value, SymValue)); + break; + } + + /* ignore */ + case R_386_NONE: + break; + +#elif ELF_MODE == 64 + + /* + * Absolute addressing + */ + case R_X86_64_64: + { + const Elf_Addr Value = SymValue + paRels[iRel].r_addend; + *(uint64_t *)pAddrW = Value; + Log4((FMT_ELF_ADDR": R_X86_64_64 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n", + SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue)); + break; + } + + /* + * Truncated 32-bit value (zero-extendedable to the 64-bit value). + */ + case R_X86_64_32: + { + const Elf_Addr Value = SymValue + paRels[iRel].r_addend; + *(uint32_t *)pAddrW = (uint32_t)Value; + Log4((FMT_ELF_ADDR": R_X86_64_32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n", + SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue)); + AssertMsgReturn((Elf_Addr)*(uint32_t *)pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG); + break; + } + + /* + * Truncated 32-bit value (sign-extendedable to the 64-bit value). + */ + case R_X86_64_32S: + { + const Elf_Addr Value = SymValue + paRels[iRel].r_addend; + *(int32_t *)pAddrW = (int32_t)Value; + Log4((FMT_ELF_ADDR": R_X86_64_32S Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n", + SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue)); + AssertMsgReturn((Elf_Addr)*(int32_t *)pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG); /** @todo check the sign-extending here. */ + break; + } + + /* + * PC relative addressing. + */ + case R_X86_64_PC32: + case R_X86_64_PLT32: /* binutils commit 451875b4f976a527395e9303224c7881b65e12ed feature/regression. */ + { + const Elf_Addr SourceAddr = SecAddr + paRels[iRel].r_offset + BaseAddr; /* Where the source really is. */ + const Elf_Addr Value = SymValue + paRels[iRel].r_addend - SourceAddr; + *(int32_t *)pAddrW = (int32_t)Value; + Log4((FMT_ELF_ADDR": R_X86_64_PC32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n", + SourceAddr, Value, SymValue)); + AssertMsgReturn((Elf_Addr)*(int32_t *)pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG); /** @todo check the sign-extending here. */ + break; + } + + /* ignore */ + case R_X86_64_NONE: + break; +#endif + + default: + AssertMsgFailed(("Unknown relocation type: %d (iRel=%d iRelMax=%d)\n", + ELF_R_TYPE(paRels[iRel].r_info), iRel, iRelMax)); + return VERR_LDRELF_RELOCATION_NOT_SUPPORTED; + } + } + + return VINF_SUCCESS; +} + + + +/** @copydoc RTLDROPS::pfnClose */ +static DECLCALLBACK(int) RTLDRELF_NAME(Close)(PRTLDRMODINTERNAL pMod) +{ + PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod; + + if (pModElf->paShdrs) + { + RTMemFree(pModElf->paShdrs); + pModElf->paShdrs = NULL; + } + + pModElf->pvBits = NULL; + + return VINF_SUCCESS; +} + + +/** @copydoc RTLDROPS::Done */ +static DECLCALLBACK(int) RTLDRELF_NAME(Done)(PRTLDRMODINTERNAL pMod) +{ + NOREF(pMod); /*PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;*/ + /** @todo Have to think more about this .... */ + return -1; +} + + +/** @copydoc RTLDROPS::EnumSymbols */ +static DECLCALLBACK(int) RTLDRELF_NAME(EnumSymbols)(PRTLDRMODINTERNAL pMod, unsigned fFlags, const void *pvBits, RTUINTPTR BaseAddress, + PFNRTLDRENUMSYMS pfnCallback, void *pvUser) +{ + PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod; + NOREF(pvBits); + + /* + * Validate the input. + */ + Elf_Addr BaseAddr = (Elf_Addr)BaseAddress; + AssertMsgReturn((RTUINTPTR)BaseAddr == BaseAddress, ("%RTptr", BaseAddress), VERR_IMAGE_BASE_TOO_HIGH); + + /* + * Make sure we've got the string and symbol tables. (We don't need the pvBits.) + */ + int rc = RTLDRELF_NAME(MapBits)(pModElf, false); + if (RT_FAILURE(rc)) + return rc; + + /* + * Enumerate the symbol table. + */ + const Elf_Sym *paSyms = pModElf->paSyms; + unsigned cSyms = pModElf->cSyms; + for (unsigned iSym = 1; iSym < cSyms; iSym++) + { + /* + * Skip imports (undefined). + */ + if (paSyms[iSym].st_shndx != SHN_UNDEF) + { + /* + * Calc value and get name. + */ + Elf_Addr Value; + if (paSyms[iSym].st_shndx == SHN_ABS) + /* absolute symbols are not subject to any relocation. */ + Value = paSyms[iSym].st_value; + else if (paSyms[iSym].st_shndx < pModElf->Ehdr.e_shnum) + { + if (pModElf->Ehdr.e_type == ET_REL) + /* relative to the section. */ + Value = BaseAddr + paSyms[iSym].st_value + pModElf->paShdrs[paSyms[iSym].st_shndx].sh_addr; + else /* Fixed up for link address. */ + Value = BaseAddr + paSyms[iSym].st_value - pModElf->LinkAddress; + } + else + { + AssertMsgFailed(("Arg! paSyms[%u].st_shndx=" FMT_ELF_HALF "\n", iSym, paSyms[iSym].st_shndx)); + return VERR_BAD_EXE_FORMAT; + } + const char *pszName = ELF_STR(pModElf, paSyms[iSym].st_name); + if ( (pszName && *pszName) + && ( (fFlags & RTLDR_ENUM_SYMBOL_FLAGS_ALL) + || ELF_ST_BIND(paSyms[iSym].st_info) == STB_GLOBAL) + ) + { + /* + * Call back. + */ + AssertMsgReturn(Value == (RTUINTPTR)Value, (FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG); + rc = pfnCallback(pMod, pszName, ~0U, (RTUINTPTR)Value, pvUser); + if (rc) + return rc; + } + } + } + + return VINF_SUCCESS; +} + + +/** @copydoc RTLDROPS::GetImageSize */ +static DECLCALLBACK(size_t) RTLDRELF_NAME(GetImageSize)(PRTLDRMODINTERNAL pMod) +{ + PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod; + + return pModElf->cbImage; +} + + +/** @copydoc RTLDROPS::GetBits */ +static DECLCALLBACK(int) RTLDRELF_NAME(GetBits)(PRTLDRMODINTERNAL pMod, void *pvBits, RTUINTPTR BaseAddress, PFNRTLDRIMPORT pfnGetImport, void *pvUser) +{ + PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod; + + /* + * This operation is currently only available on relocatable images. + */ + switch (pModElf->Ehdr.e_type) + { + case ET_REL: + break; + case ET_EXEC: + Log(("RTLdrELF: %s: Executable images are not supported yet!\n", pModElf->Core.pReader->pfnLogName(pModElf->Core.pReader))); + return VERR_LDRELF_EXEC; + case ET_DYN: + Log(("RTLdrELF: %s: Dynamic images are not supported yet!\n", pModElf->Core.pReader->pfnLogName(pModElf->Core.pReader))); + return VERR_LDRELF_DYN; + default: AssertFailedReturn(VERR_BAD_EXE_FORMAT); + } + + /* + * Load the bits into pvBits. + */ + const Elf_Shdr *paShdrs = pModElf->paShdrs; + for (unsigned iShdr = 0; iShdr < pModElf->Ehdr.e_shnum; iShdr++) + { + if (paShdrs[iShdr].sh_flags & SHF_ALLOC) + { + AssertMsgReturn((size_t)paShdrs[iShdr].sh_size == (size_t)paShdrs[iShdr].sh_size, (FMT_ELF_SIZE "\n", paShdrs[iShdr].sh_size), VERR_IMAGE_TOO_BIG); + switch (paShdrs[iShdr].sh_type) + { + case SHT_NOBITS: + memset((uint8_t *)pvBits + paShdrs[iShdr].sh_addr, 0, (size_t)paShdrs[iShdr].sh_size); + break; + + case SHT_PROGBITS: + default: + { + int rc = pModElf->Core.pReader->pfnRead(pModElf->Core.pReader, (uint8_t *)pvBits + paShdrs[iShdr].sh_addr, + (size_t)paShdrs[iShdr].sh_size, paShdrs[iShdr].sh_offset); + if (RT_FAILURE(rc)) + { + Log(("RTLdrELF: %s: Read error when reading " FMT_ELF_SIZE " bytes at " FMT_ELF_OFF ", iShdr=%d\n", + pModElf->Core.pReader->pfnLogName(pModElf->Core.pReader), + paShdrs[iShdr].sh_size, paShdrs[iShdr].sh_offset, iShdr)); + return rc; + } + } + } + } + } + + /* + * Relocate the image. + */ + return pModElf->Core.pOps->pfnRelocate(pMod, pvBits, BaseAddress, ~(RTUINTPTR)0, pfnGetImport, pvUser); +} + + +/** @copydoc RTLDROPS::Relocate */ +static DECLCALLBACK(int) RTLDRELF_NAME(Relocate)(PRTLDRMODINTERNAL pMod, void *pvBits, RTUINTPTR NewBaseAddress, + RTUINTPTR OldBaseAddress, PFNRTLDRIMPORT pfnGetImport, void *pvUser) +{ + PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod; +#ifdef LOG_ENABLED + const char *pszLogName = pModElf->Core.pReader->pfnLogName(pModElf->Core.pReader); +#endif + NOREF(OldBaseAddress); + + /* + * This operation is currently only available on relocatable images. + */ + switch (pModElf->Ehdr.e_type) + { + case ET_REL: + break; + case ET_EXEC: + Log(("RTLdrELF: %s: Executable images are not supported yet!\n", pszLogName)); + return VERR_LDRELF_EXEC; + case ET_DYN: + Log(("RTLdrELF: %s: Dynamic images are not supported yet!\n", pszLogName)); + return VERR_LDRELF_DYN; + default: AssertFailedReturn(VERR_BAD_EXE_FORMAT); + } + + /* + * Validate the input. + */ + Elf_Addr BaseAddr = (Elf_Addr)NewBaseAddress; + AssertMsgReturn((RTUINTPTR)BaseAddr == NewBaseAddress, ("%RTptr", NewBaseAddress), VERR_IMAGE_BASE_TOO_HIGH); + + /* + * Map the image bits if not already done and setup pointer into it. + */ + int rc = RTLDRELF_NAME(MapBits)(pModElf, true); + if (RT_FAILURE(rc)) + return rc; + + /* + * Iterate the sections looking for interesting SHT_REL[A] sections. + * SHT_REL[A] sections have the section index of the section they contain fixups + * for in the sh_info member. + */ + const Elf_Shdr *paShdrs = pModElf->paShdrs; + Log2(("rtLdrElf: %s: Fixing up image\n", pszLogName)); + for (unsigned iShdr = 0; iShdr < pModElf->Ehdr.e_shnum; iShdr++) + { + const Elf_Shdr *pShdrRel = &paShdrs[iShdr]; + + /* + * Skip sections without interest to us. + */ +#if ELF_MODE == 32 + if (pShdrRel->sh_type != SHT_REL) +#else + if (pShdrRel->sh_type != SHT_RELA) +#endif + continue; + if (pShdrRel->sh_info >= pModElf->Ehdr.e_shnum) + continue; + const Elf_Shdr *pShdr = &paShdrs[pShdrRel->sh_info]; /* the section to fixup. */ + if (!(pShdr->sh_flags & SHF_ALLOC)) + continue; + + /* + * Relocate the section. + */ + Log2(("rtldrELF: %s: Relocation records for #%d [%s] (sh_info=%d sh_link=%d) found in #%d [%s] (sh_info=%d sh_link=%d)\n", + pszLogName, (int)pShdrRel->sh_info, ELF_SH_STR(pModElf, pShdr->sh_name), (int)pShdr->sh_info, (int)pShdr->sh_link, + iShdr, ELF_SH_STR(pModElf, pShdrRel->sh_name), (int)pShdrRel->sh_info, (int)pShdrRel->sh_link)); + + /** @todo Make RelocateSection a function pointer so we can select the one corresponding to the machine when opening the image. */ + if (pModElf->Ehdr.e_type == ET_REL) + rc = RTLDRELF_NAME(RelocateSection)(pModElf, BaseAddr, pfnGetImport, pvUser, + pShdr->sh_addr, + pShdr->sh_size, + (const uint8_t *)pModElf->pvBits + pShdr->sh_offset, + (uint8_t *)pvBits + pShdr->sh_addr, + (const uint8_t *)pModElf->pvBits + pShdrRel->sh_offset, + pShdrRel->sh_size); + else + rc = RTLDRELF_NAME(RelocateSectionExecDyn)(pModElf, BaseAddr, pfnGetImport, pvUser, + pShdr->sh_addr, + pShdr->sh_size, + (const uint8_t *)pModElf->pvBits + pShdr->sh_offset, + (uint8_t *)pvBits + pShdr->sh_addr, + (const uint8_t *)pModElf->pvBits + pShdrRel->sh_offset, + pShdrRel->sh_size); + if (RT_FAILURE(rc)) + return rc; + } + return VINF_SUCCESS; +} + + +/** + * Worker for pfnGetSymbolEx. + */ +static int RTLDRELF_NAME(ReturnSymbol)(PRTLDRMODELF pThis, const Elf_Sym *pSym, Elf_Addr uBaseAddr, PRTUINTPTR pValue) +{ + Elf_Addr Value; + if (pSym->st_shndx == SHN_ABS) + /* absolute symbols are not subject to any relocation. */ + Value = pSym->st_value; + else if (pSym->st_shndx < pThis->Ehdr.e_shnum) + { + if (pThis->Ehdr.e_type == ET_REL) + /* relative to the section. */ + Value = uBaseAddr + pSym->st_value + pThis->paShdrs[pSym->st_shndx].sh_addr; + else /* Fixed up for link address. */ + Value = uBaseAddr + pSym->st_value - pThis->LinkAddress; + } + else + { + AssertMsgFailed(("Arg! pSym->st_shndx=%d\n", pSym->st_shndx)); + return VERR_BAD_EXE_FORMAT; + } + AssertMsgReturn(Value == (RTUINTPTR)Value, (FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG); + *pValue = (RTUINTPTR)Value; + return VINF_SUCCESS; +} + + +/** @copydoc RTLDROPS::pfnGetSymbolEx */ +static DECLCALLBACK(int) RTLDRELF_NAME(GetSymbolEx)(PRTLDRMODINTERNAL pMod, const void *pvBits, RTUINTPTR BaseAddress, + uint32_t iOrdinal, const char *pszSymbol, RTUINTPTR *pValue) +{ + PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod; + NOREF(pvBits); + + /* + * Validate the input. + */ + Elf_Addr uBaseAddr = (Elf_Addr)BaseAddress; + AssertMsgReturn((RTUINTPTR)uBaseAddr == BaseAddress, ("%RTptr", BaseAddress), VERR_IMAGE_BASE_TOO_HIGH); + + /* + * Map the image bits if not already done and setup pointer into it. + */ + int rc = RTLDRELF_NAME(MapBits)(pModElf, true); + if (RT_FAILURE(rc)) + return rc; + + /* + * Calc all kinds of pointers before we start iterating the symbol table. + */ + const Elf_Sym *paSyms = pModElf->paSyms; + unsigned cSyms = pModElf->cSyms; + if (iOrdinal == UINT32_MAX) + { + const char *pStr = pModElf->pStr; + for (unsigned iSym = 1; iSym < cSyms; iSym++) + { + /* Undefined symbols are not exports, they are imports. */ + if ( paSyms[iSym].st_shndx != SHN_UNDEF + && ( ELF_ST_BIND(paSyms[iSym].st_info) == STB_GLOBAL + || ELF_ST_BIND(paSyms[iSym].st_info) == STB_WEAK)) + { + /* Validate the name string and try match with it. */ + if (paSyms[iSym].st_name < pModElf->cbStr) + { + if (!strcmp(pszSymbol, pStr + paSyms[iSym].st_name)) + { + /* matched! */ + return RTLDRELF_NAME(ReturnSymbol)(pModElf, &paSyms[iSym], uBaseAddr, pValue); + } + } + else + { + AssertMsgFailed(("String outside string table! iSym=%d paSyms[iSym].st_name=%#x\n", iSym, paSyms[iSym].st_name)); + return VERR_LDRELF_INVALID_SYMBOL_NAME_OFFSET; + } + } + } + } + else if (iOrdinal < cSyms) + { + if ( paSyms[iOrdinal].st_shndx != SHN_UNDEF + && ( ELF_ST_BIND(paSyms[iOrdinal].st_info) == STB_GLOBAL + || ELF_ST_BIND(paSyms[iOrdinal].st_info) == STB_WEAK)) + return RTLDRELF_NAME(ReturnSymbol)(pModElf, &paSyms[iOrdinal], uBaseAddr, pValue); + } + + return VERR_SYMBOL_NOT_FOUND; +} + + +/** @copydoc RTLDROPS::pfnEnumDbgInfo */ +static DECLCALLBACK(int) RTLDRELF_NAME(EnumDbgInfo)(PRTLDRMODINTERNAL pMod, const void *pvBits, + PFNRTLDRENUMDBG pfnCallback, void *pvUser) +{ + PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod; + RT_NOREF_PV(pvBits); + + /* + * Map the image bits if not already done and setup pointer into it. + */ + int rc = RTLDRELF_NAME(MapBits)(pModElf, true); + if (RT_FAILURE(rc)) + return rc; + + /* + * Do the enumeration. + */ + const Elf_Shdr *paShdrs = pModElf->paOrgShdrs; + for (unsigned iShdr = 0; iShdr < pModElf->Ehdr.e_shnum; iShdr++) + { + /* Debug sections are expected to be PROGBITS and not allocated. */ + if (paShdrs[iShdr].sh_type != SHT_PROGBITS) + continue; + if (paShdrs[iShdr].sh_flags & SHF_ALLOC) + continue; + + RTLDRDBGINFO DbgInfo; + const char *pszSectName = ELF_SH_STR(pModElf, paShdrs[iShdr].sh_name); + if ( !strncmp(pszSectName, RT_STR_TUPLE(".debug_")) + || !strcmp(pszSectName, ".WATCOM_references") ) + { + RT_ZERO(DbgInfo.u); + DbgInfo.enmType = RTLDRDBGINFOTYPE_DWARF; + DbgInfo.pszExtFile = NULL; + DbgInfo.offFile = paShdrs[iShdr].sh_offset; + DbgInfo.cb = paShdrs[iShdr].sh_size; + DbgInfo.u.Dwarf.pszSection = pszSectName; + } + else if (!strcmp(pszSectName, ".gnu_debuglink")) + { + if ((paShdrs[iShdr].sh_size & 3) || paShdrs[iShdr].sh_size < 8) + return VERR_BAD_EXE_FORMAT; + + RT_ZERO(DbgInfo.u); + DbgInfo.enmType = RTLDRDBGINFOTYPE_DWARF_DWO; + DbgInfo.pszExtFile = (const char *)((uintptr_t)pModElf->pvBits + (uintptr_t)paShdrs[iShdr].sh_offset); + if (!RTStrEnd(DbgInfo.pszExtFile, paShdrs[iShdr].sh_size)) + return VERR_BAD_EXE_FORMAT; + DbgInfo.u.Dwo.uCrc32 = *(uint32_t *)((uintptr_t)DbgInfo.pszExtFile + (uintptr_t)paShdrs[iShdr].sh_size + - sizeof(uint32_t)); + DbgInfo.offFile = -1; + DbgInfo.cb = 0; + } + else + continue; + + DbgInfo.LinkAddress = NIL_RTLDRADDR; + DbgInfo.iDbgInfo = iShdr - 1; + + rc = pfnCallback(pMod, &DbgInfo, pvUser); + if (rc != VINF_SUCCESS) + return rc; + + } + + return VINF_SUCCESS; +} + + +/** + * Helper that locates the first allocated section. + * + * @returns Pointer to the section header if found, NULL if none. + * @param pShdr The section header to start searching at. + * @param cLeft The number of section headers left to search. Can be 0. + */ +static const Elf_Shdr *RTLDRELF_NAME(GetFirstAllocatedSection)(const Elf_Shdr *pShdr, unsigned cLeft) +{ + while (cLeft-- > 0) + { + if (pShdr->sh_flags & SHF_ALLOC) + return pShdr; + pShdr++; + } + return NULL; +} + +/** @copydoc RTLDROPS::pfnEnumSegments. */ +static DECLCALLBACK(int) RTLDRELF_NAME(EnumSegments)(PRTLDRMODINTERNAL pMod, PFNRTLDRENUMSEGS pfnCallback, void *pvUser) +{ + PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod; + + /* + * Map the image bits if not already done and setup pointer into it. + */ + int rc = RTLDRELF_NAME(MapBits)(pModElf, true); + if (RT_FAILURE(rc)) + return rc; + + /* + * Do the enumeration. + */ + char szName[32]; + Elf_Addr uPrevMappedRva = 0; + const Elf_Shdr *paShdrs = pModElf->paShdrs; + const Elf_Shdr *paOrgShdrs = pModElf->paOrgShdrs; + for (unsigned iShdr = 1; iShdr < pModElf->Ehdr.e_shnum; iShdr++) + { + RTLDRSEG Seg; + Seg.pszName = ELF_SH_STR(pModElf, paShdrs[iShdr].sh_name); + Seg.cchName = (uint32_t)strlen(Seg.pszName); + if (Seg.cchName == 0) + { + Seg.pszName = szName; + Seg.cchName = (uint32_t)RTStrPrintf(szName, sizeof(szName), "UnamedSect%02u", iShdr); + } + Seg.SelFlat = 0; + Seg.Sel16bit = 0; + Seg.fFlags = 0; + Seg.fProt = RTMEM_PROT_READ; + if (paShdrs[iShdr].sh_flags & SHF_WRITE) + Seg.fProt |= RTMEM_PROT_WRITE; + if (paShdrs[iShdr].sh_flags & SHF_EXECINSTR) + Seg.fProt |= RTMEM_PROT_EXEC; + Seg.cb = paShdrs[iShdr].sh_size; + Seg.Alignment = paShdrs[iShdr].sh_addralign; + if (paShdrs[iShdr].sh_flags & SHF_ALLOC) + { + Seg.LinkAddress = paOrgShdrs[iShdr].sh_addr; + Seg.RVA = paShdrs[iShdr].sh_addr; + const Elf_Shdr *pShdr2 = RTLDRELF_NAME(GetFirstAllocatedSection)(&paShdrs[iShdr + 1], + pModElf->Ehdr.e_shnum - iShdr - 1); + if ( pShdr2 + && pShdr2->sh_addr >= paShdrs[iShdr].sh_addr + && Seg.RVA >= uPrevMappedRva) + Seg.cbMapped = pShdr2->sh_addr - paShdrs[iShdr].sh_addr; + else + Seg.cbMapped = RT_MAX(paShdrs[iShdr].sh_size, paShdrs[iShdr].sh_addralign); + uPrevMappedRva = Seg.RVA; + } + else + { + Seg.LinkAddress = NIL_RTLDRADDR; + Seg.RVA = NIL_RTLDRADDR; + Seg.cbMapped = NIL_RTLDRADDR; + } + if (paShdrs[iShdr].sh_type != SHT_NOBITS) + { + Seg.offFile = paShdrs[iShdr].sh_offset; + Seg.cbFile = paShdrs[iShdr].sh_size; + } + else + { + Seg.offFile = -1; + Seg.cbFile = 0; + } + + rc = pfnCallback(pMod, &Seg, pvUser); + if (rc != VINF_SUCCESS) + return rc; + } + + return VINF_SUCCESS; +} + + +/** @copydoc RTLDROPS::pfnLinkAddressToSegOffset. */ +static DECLCALLBACK(int) RTLDRELF_NAME(LinkAddressToSegOffset)(PRTLDRMODINTERNAL pMod, RTLDRADDR LinkAddress, + uint32_t *piSeg, PRTLDRADDR poffSeg) +{ + PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod; + + const Elf_Shdr *pShdrEnd = NULL; + unsigned cLeft = pModElf->Ehdr.e_shnum - 1; + const Elf_Shdr *pShdr = &pModElf->paOrgShdrs[cLeft]; + while (cLeft-- > 0) + { + if (pShdr->sh_flags & SHF_ALLOC) + { + RTLDRADDR offSeg = LinkAddress - pShdr->sh_addr; + if (offSeg < pShdr->sh_size) + { + *poffSeg = offSeg; + *piSeg = cLeft; + return VINF_SUCCESS; + } + if (offSeg == pShdr->sh_size) + pShdrEnd = pShdr; + } + pShdr--; + } + + if (pShdrEnd) + { + *poffSeg = pShdrEnd->sh_size; + *piSeg = pShdrEnd - pModElf->paOrgShdrs - 1; + return VINF_SUCCESS; + } + + return VERR_LDR_INVALID_LINK_ADDRESS; +} + + +/** @copydoc RTLDROPS::pfnLinkAddressToRva. */ +static DECLCALLBACK(int) RTLDRELF_NAME(LinkAddressToRva)(PRTLDRMODINTERNAL pMod, RTLDRADDR LinkAddress, PRTLDRADDR pRva) +{ + PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod; + uint32_t iSeg; + RTLDRADDR offSeg; + int rc = RTLDRELF_NAME(LinkAddressToSegOffset)(pMod, LinkAddress, &iSeg, &offSeg); + if (RT_SUCCESS(rc)) + *pRva = pModElf->paShdrs[iSeg + 1].sh_addr + offSeg; + return rc; +} + + +/** @copydoc RTLDROPS::pfnSegOffsetToRva. */ +static DECLCALLBACK(int) RTLDRELF_NAME(SegOffsetToRva)(PRTLDRMODINTERNAL pMod, uint32_t iSeg, RTLDRADDR offSeg, + PRTLDRADDR pRva) +{ + PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod; + if (iSeg >= pModElf->Ehdr.e_shnum - 1U) + return VERR_LDR_INVALID_SEG_OFFSET; + + iSeg++; /* skip section 0 */ + if (offSeg > pModElf->paShdrs[iSeg].sh_size) + { + const Elf_Shdr *pShdr2 = RTLDRELF_NAME(GetFirstAllocatedSection)(&pModElf->paShdrs[iSeg + 1], + pModElf->Ehdr.e_shnum - iSeg - 1); + if ( !pShdr2 + || offSeg > (pShdr2->sh_addr - pModElf->paShdrs[iSeg].sh_addr)) + return VERR_LDR_INVALID_SEG_OFFSET; + } + + if (!(pModElf->paShdrs[iSeg].sh_flags & SHF_ALLOC)) + return VERR_LDR_INVALID_SEG_OFFSET; + + *pRva = pModElf->paShdrs[iSeg].sh_addr; + return VINF_SUCCESS; +} + + +/** @copydoc RTLDROPS::pfnRvaToSegOffset. */ +static DECLCALLBACK(int) RTLDRELF_NAME(RvaToSegOffset)(PRTLDRMODINTERNAL pMod, RTLDRADDR Rva, + uint32_t *piSeg, PRTLDRADDR poffSeg) +{ + PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod; + + Elf_Addr PrevAddr = 0; + unsigned cLeft = pModElf->Ehdr.e_shnum - 1; + const Elf_Shdr *pShdr = &pModElf->paShdrs[cLeft]; + while (cLeft-- > 0) + { + if (pShdr->sh_flags & SHF_ALLOC) + { + Elf_Addr cbSeg = PrevAddr ? PrevAddr - pShdr->sh_addr : pShdr->sh_size; + RTLDRADDR offSeg = Rva - pShdr->sh_addr; + if (offSeg <= cbSeg) + { + *poffSeg = offSeg; + *piSeg = cLeft; + return VINF_SUCCESS; + } + PrevAddr = pShdr->sh_addr; + } + pShdr--; + } + + return VERR_LDR_INVALID_RVA; +} + + +/** @callback_method_impl{FNRTLDRIMPORT, Stub used by ReadDbgInfo.} */ +static DECLCALLBACK(int) RTLDRELF_NAME(GetImportStubCallback)(RTLDRMOD hLdrMod, const char *pszModule, const char *pszSymbol, + unsigned uSymbol, PRTLDRADDR pValue, void *pvUser) +{ + RT_NOREF_PV(hLdrMod); RT_NOREF_PV(pszModule); RT_NOREF_PV(pszSymbol); + RT_NOREF_PV(uSymbol); RT_NOREF_PV(pValue); RT_NOREF_PV(pvUser); + return VERR_SYMBOL_NOT_FOUND; +} + + +/** @copydoc RTLDROPS::pfnReadDbgInfo. */ +static DECLCALLBACK(int) RTLDRELF_NAME(ReadDbgInfo)(PRTLDRMODINTERNAL pMod, uint32_t iDbgInfo, RTFOFF off, + size_t cb, void *pvBuf) +{ + PRTLDRMODELF pThis = (PRTLDRMODELF)pMod; + LogFlow(("%s: iDbgInfo=%#x off=%RTfoff cb=%#zu\n", __FUNCTION__, iDbgInfo, off, cb)); + + /* + * Input validation. + */ + AssertReturn(iDbgInfo < pThis->Ehdr.e_shnum && iDbgInfo + 1 < pThis->Ehdr.e_shnum, VERR_INVALID_PARAMETER); + iDbgInfo++; + AssertReturn(!(pThis->paShdrs[iDbgInfo].sh_flags & SHF_ALLOC), VERR_INVALID_PARAMETER); + AssertReturn(pThis->paShdrs[iDbgInfo].sh_type == SHT_PROGBITS, VERR_INVALID_PARAMETER); + AssertReturn(pThis->paShdrs[iDbgInfo].sh_offset == (uint64_t)off, VERR_INVALID_PARAMETER); + AssertReturn(pThis->paShdrs[iDbgInfo].sh_size == cb, VERR_INVALID_PARAMETER); + RTFOFF cbRawImage = pThis->Core.pReader->pfnSize(pThis->Core.pReader); + AssertReturn(cbRawImage >= 0, VERR_INVALID_PARAMETER); + AssertReturn(off >= 0 && cb <= (uint64_t)cbRawImage && (uint64_t)off + cb <= (uint64_t)cbRawImage, VERR_INVALID_PARAMETER); + + /* + * Read it from the file and look for fixup sections. + */ + int rc; + if (pThis->pvBits) + memcpy(pvBuf, (const uint8_t *)pThis->pvBits + (size_t)off, cb); + else + { + rc = pThis->Core.pReader->pfnRead(pThis->Core.pReader, pvBuf, cb, off); + if (RT_FAILURE(rc)) + return rc; + } + + uint32_t iRelocs = iDbgInfo + 1; + if ( iRelocs >= pThis->Ehdr.e_shnum + || pThis->paShdrs[iRelocs].sh_info != iDbgInfo + || ( pThis->paShdrs[iRelocs].sh_type != SHT_REL + && pThis->paShdrs[iRelocs].sh_type != SHT_RELA) ) + { + iRelocs = 0; + while ( iRelocs < pThis->Ehdr.e_shnum + && ( pThis->paShdrs[iRelocs].sh_info != iDbgInfo + || ( pThis->paShdrs[iRelocs].sh_type != SHT_REL + && pThis->paShdrs[iRelocs].sh_type != SHT_RELA)) ) + iRelocs++; + } + if ( iRelocs < pThis->Ehdr.e_shnum + && pThis->paShdrs[iRelocs].sh_size > 0) + { + /* + * Load the relocations. + */ + uint8_t *pbRelocsBuf = NULL; + const uint8_t *pbRelocs; + if (pThis->pvBits) + pbRelocs = (const uint8_t *)pThis->pvBits + pThis->paShdrs[iRelocs].sh_offset; + else + { + pbRelocs = pbRelocsBuf = (uint8_t *)RTMemTmpAlloc(pThis->paShdrs[iRelocs].sh_size); + if (!pbRelocsBuf) + return VERR_NO_TMP_MEMORY; + rc = pThis->Core.pReader->pfnRead(pThis->Core.pReader, pbRelocsBuf, + pThis->paShdrs[iRelocs].sh_size, + pThis->paShdrs[iRelocs].sh_offset); + if (RT_FAILURE(rc)) + { + RTMemTmpFree(pbRelocsBuf); + return rc; + } + } + + /* + * Apply the relocations. + */ + if (pThis->Ehdr.e_type == ET_REL) + rc = RTLDRELF_NAME(RelocateSection)(pThis, pThis->LinkAddress, + RTLDRELF_NAME(GetImportStubCallback), NULL /*pvUser*/, + pThis->paShdrs[iDbgInfo].sh_addr, + pThis->paShdrs[iDbgInfo].sh_size, + (const uint8_t *)pvBuf, + (uint8_t *)pvBuf, + pbRelocs, + pThis->paShdrs[iRelocs].sh_size); + else + rc = RTLDRELF_NAME(RelocateSectionExecDyn)(pThis, pThis->LinkAddress, + RTLDRELF_NAME(GetImportStubCallback), NULL /*pvUser*/, + pThis->paShdrs[iDbgInfo].sh_addr, + pThis->paShdrs[iDbgInfo].sh_size, + (const uint8_t *)pvBuf, + (uint8_t *)pvBuf, + pbRelocs, + pThis->paShdrs[iRelocs].sh_size); + + RTMemTmpFree(pbRelocsBuf); + } + else + rc = VINF_SUCCESS; + return rc; +} + + +/** + * @interface_method_impl{RTLDROPS,pfnUnwindFrame} + */ +static DECLCALLBACK(int) +RTLDRELF_NAME(UnwindFrame)(PRTLDRMODINTERNAL pMod, void const *pvBits, uint32_t iSeg, RTUINTPTR off, PRTDBGUNWINDSTATE pState) +{ + PRTLDRMODELF pThis = (PRTLDRMODELF)pMod; + LogFlow(("%s: iSeg=%#x off=%RTptr\n", __FUNCTION__, iSeg, off)); + + /* + * Process the input address, making us both RVA and proper seg:offset out of it. + */ + int rc; + RTLDRADDR uRva = off; + if (iSeg == UINT32_MAX) + rc = RTLDRELF_NAME(RvaToSegOffset)(pMod, uRva, &iSeg, &off); + else + rc = RTLDRELF_NAME(SegOffsetToRva)(pMod, iSeg, off, &uRva); + AssertRCReturn(rc, rc); + + /* + * Map the image bits if not already done and setup pointer into it. + */ + RT_NOREF(pvBits); /** @todo Try use passed in pvBits? */ + rc = RTLDRELF_NAME(MapBits)(pThis, true); + if (RT_FAILURE(rc)) + return rc; + + /* + * Do we need to search for .eh_frame and .eh_frame_hdr? + */ + if (pThis->iShEhFrame == 0) + { + pThis->iShEhFrame = ~0U; + pThis->iShEhFrameHdr = ~0U; + unsigned cLeft = 2; + for (unsigned iShdr = 1; iShdr < pThis->Ehdr.e_shnum; iShdr++) + { + const char *pszName = ELF_SH_STR(pThis, pThis->paShdrs[iShdr].sh_name); + if ( pszName[0] == '.' + && pszName[1] == 'e' + && pszName[2] == 'h' + && pszName[3] == '_' + && pszName[4] == 'f' + && pszName[5] == 'r' + && pszName[6] == 'a' + && pszName[7] == 'm' + && pszName[8] == 'e') + { + if (pszName[9] == '\0') + pThis->iShEhFrame = iShdr; + else if ( pszName[9] == '_' + && pszName[10] == 'h' + && pszName[11] == 'd' + && pszName[12] == 'r' + && pszName[13] == '\0') + pThis->iShEhFrameHdr = iShdr; + else + continue; + if (--cLeft == 0) + break; + } + } + } + + /* + * Any info present? + */ + unsigned iShdr = pThis->iShEhFrame; + if ( iShdr != ~0U + && pThis->paShdrs[iShdr].sh_size > 0) + { + if (pThis->paShdrs[iShdr].sh_flags & SHF_ALLOC) + return rtDwarfUnwind_EhData((uint8_t const *)pThis->pvBits + pThis->paShdrs[iShdr].sh_addr, + pThis->paShdrs[iShdr].sh_size, pThis->paShdrs[iShdr].sh_addr, + iSeg, off, uRva, pState, pThis->Core.enmArch); + } + return VERR_DBG_NO_UNWIND_INFO; +} + + +/** + * The ELF module operations. + */ +static RTLDROPS RTLDRELF_MID(s_rtldrElf,Ops) = +{ +#if ELF_MODE == 32 + "elf32", +#elif ELF_MODE == 64 + "elf64", +#endif + RTLDRELF_NAME(Close), + NULL, /* Get Symbol */ + RTLDRELF_NAME(Done), + RTLDRELF_NAME(EnumSymbols), + /* ext: */ + RTLDRELF_NAME(GetImageSize), + RTLDRELF_NAME(GetBits), + RTLDRELF_NAME(Relocate), + RTLDRELF_NAME(GetSymbolEx), + NULL /*pfnQueryForwarderInfo*/, + RTLDRELF_NAME(EnumDbgInfo), + RTLDRELF_NAME(EnumSegments), + RTLDRELF_NAME(LinkAddressToSegOffset), + RTLDRELF_NAME(LinkAddressToRva), + RTLDRELF_NAME(SegOffsetToRva), + RTLDRELF_NAME(RvaToSegOffset), + RTLDRELF_NAME(ReadDbgInfo), + NULL /*pfnQueryProp*/, + NULL /*pfnVerifySignature*/, + NULL /*pfnHashImage*/, + RTLDRELF_NAME(UnwindFrame), + 42 +}; + + + +/** + * Validates the ELF header. + * + * @returns iprt status code. + * @param pEhdr Pointer to the ELF header. + * @param pszLogName The log name. + * @param cbRawImage The size of the raw image. + */ +static int RTLDRELF_NAME(ValidateElfHeader)(const Elf_Ehdr *pEhdr, const char *pszLogName, uint64_t cbRawImage, + PRTLDRARCH penmArch) +{ + Log3(("RTLdrELF: e_ident: %.*Rhxs\n" + "RTLdrELF: e_type: " FMT_ELF_HALF "\n" + "RTLdrELF: e_version: " FMT_ELF_HALF "\n" + "RTLdrELF: e_entry: " FMT_ELF_ADDR "\n" + "RTLdrELF: e_phoff: " FMT_ELF_OFF "\n" + "RTLdrELF: e_shoff: " FMT_ELF_OFF "\n" + "RTLdrELF: e_flags: " FMT_ELF_WORD "\n" + "RTLdrELF: e_ehsize: " FMT_ELF_HALF "\n" + "RTLdrELF: e_phentsize: " FMT_ELF_HALF "\n" + "RTLdrELF: e_phnum: " FMT_ELF_HALF "\n" + "RTLdrELF: e_shentsize: " FMT_ELF_HALF "\n" + "RTLdrELF: e_shnum: " FMT_ELF_HALF "\n" + "RTLdrELF: e_shstrndx: " FMT_ELF_HALF "\n", + RT_ELEMENTS(pEhdr->e_ident), &pEhdr->e_ident[0], pEhdr->e_type, pEhdr->e_version, + pEhdr->e_entry, pEhdr->e_phoff, pEhdr->e_shoff,pEhdr->e_flags, pEhdr->e_ehsize, pEhdr->e_phentsize, + pEhdr->e_phnum, pEhdr->e_shentsize, pEhdr->e_shnum, pEhdr->e_shstrndx)); + + if ( pEhdr->e_ident[EI_MAG0] != ELFMAG0 + || pEhdr->e_ident[EI_MAG1] != ELFMAG1 + || pEhdr->e_ident[EI_MAG2] != ELFMAG2 + || pEhdr->e_ident[EI_MAG3] != ELFMAG3 + ) + { + Log(("RTLdrELF: %s: Invalid ELF magic (%.*Rhxs)\n", pszLogName, sizeof(pEhdr->e_ident), pEhdr->e_ident)); NOREF(pszLogName); + return VERR_BAD_EXE_FORMAT; + } + if (pEhdr->e_ident[EI_CLASS] != RTLDRELF_SUFF(ELFCLASS)) + { + Log(("RTLdrELF: %s: Invalid ELF class (%.*Rhxs)\n", pszLogName, sizeof(pEhdr->e_ident), pEhdr->e_ident)); + return VERR_BAD_EXE_FORMAT; + } + if (pEhdr->e_ident[EI_DATA] != ELFDATA2LSB) + { + Log(("RTLdrELF: %s: ELF endian %x is unsupported\n", pszLogName, pEhdr->e_ident[EI_DATA])); + return VERR_LDRELF_ODD_ENDIAN; + } + if (pEhdr->e_version != EV_CURRENT) + { + Log(("RTLdrELF: %s: ELF version %x is unsupported\n", pszLogName, pEhdr->e_version)); + return VERR_LDRELF_VERSION; + } + + if (sizeof(Elf_Ehdr) != pEhdr->e_ehsize) + { + Log(("RTLdrELF: %s: Elf header e_ehsize is %d expected %d!\n", + pszLogName, pEhdr->e_ehsize, sizeof(Elf_Ehdr))); + return VERR_BAD_EXE_FORMAT; + } + if ( sizeof(Elf_Phdr) != pEhdr->e_phentsize + && ( pEhdr->e_phnum != 0 + || pEhdr->e_type == ET_DYN)) + { + Log(("RTLdrELF: %s: Elf header e_phentsize is %d expected %d!\n", + pszLogName, pEhdr->e_phentsize, sizeof(Elf_Phdr))); + return VERR_BAD_EXE_FORMAT; + } + if (sizeof(Elf_Shdr) != pEhdr->e_shentsize) + { + Log(("RTLdrELF: %s: Elf header e_shentsize is %d expected %d!\n", + pszLogName, pEhdr->e_shentsize, sizeof(Elf_Shdr))); + return VERR_BAD_EXE_FORMAT; + } + + switch (pEhdr->e_type) + { + case ET_REL: + case ET_EXEC: + case ET_DYN: + break; + default: + Log(("RTLdrELF: %s: image type %#x is not supported!\n", pszLogName, pEhdr->e_type)); + return VERR_BAD_EXE_FORMAT; + } + + switch (pEhdr->e_machine) + { +#if ELF_MODE == 32 + case EM_386: + case EM_486: + *penmArch = RTLDRARCH_X86_32; + break; +#elif ELF_MODE == 64 + case EM_X86_64: + *penmArch = RTLDRARCH_AMD64; + break; +#endif + default: + Log(("RTLdrELF: %s: machine type %u is not supported!\n", pszLogName, pEhdr->e_machine)); + return VERR_LDRELF_MACHINE; + } + + if ( pEhdr->e_phoff < pEhdr->e_ehsize + && !(pEhdr->e_phoff && pEhdr->e_phnum) + && pEhdr->e_phnum) + { + Log(("RTLdrELF: %s: The program headers overlap with the ELF header! e_phoff=" FMT_ELF_OFF "\n", + pszLogName, pEhdr->e_phoff)); + return VERR_BAD_EXE_FORMAT; + } + if ( pEhdr->e_phoff + pEhdr->e_phnum * pEhdr->e_phentsize > cbRawImage + || pEhdr->e_phoff + pEhdr->e_phnum * pEhdr->e_phentsize < pEhdr->e_phoff) + { + Log(("RTLdrELF: %s: The program headers extends beyond the file! e_phoff=" FMT_ELF_OFF " e_phnum=" FMT_ELF_HALF "\n", + pszLogName, pEhdr->e_phoff, pEhdr->e_phnum)); + return VERR_BAD_EXE_FORMAT; + } + + + if ( pEhdr->e_shoff < pEhdr->e_ehsize + && !(pEhdr->e_shoff && pEhdr->e_shnum)) + { + Log(("RTLdrELF: %s: The section headers overlap with the ELF header! e_shoff=" FMT_ELF_OFF "\n", + pszLogName, pEhdr->e_shoff)); + return VERR_BAD_EXE_FORMAT; + } + if ( pEhdr->e_shoff + pEhdr->e_shnum * pEhdr->e_shentsize > cbRawImage + || pEhdr->e_shoff + pEhdr->e_shnum * pEhdr->e_shentsize < pEhdr->e_shoff) + { + Log(("RTLdrELF: %s: The section headers extends beyond the file! e_shoff=" FMT_ELF_OFF " e_shnum=" FMT_ELF_HALF "\n", + pszLogName, pEhdr->e_shoff, pEhdr->e_shnum)); + return VERR_BAD_EXE_FORMAT; + } + + if (pEhdr->e_shstrndx == 0 || pEhdr->e_shstrndx > pEhdr->e_shnum) + { + Log(("RTLdrELF: %s: The section headers string table is out of bounds! e_shstrndx=" FMT_ELF_HALF " e_shnum=" FMT_ELF_HALF "\n", + pszLogName, pEhdr->e_shstrndx, pEhdr->e_shnum)); + return VERR_BAD_EXE_FORMAT; + } + + return VINF_SUCCESS; +} + +/** + * Gets the section header name. + * + * @returns pszName. + * @param pEhdr The elf header. + * @param offName The offset of the section header name. + * @param pszName Where to store the name. + * @param cbName The size of the buffer pointed to by pszName. + */ +const char *RTLDRELF_NAME(GetSHdrName)(PRTLDRMODELF pModElf, Elf_Word offName, char *pszName, size_t cbName) +{ + RTFOFF off = pModElf->paShdrs[pModElf->Ehdr.e_shstrndx].sh_offset + offName; + int rc = pModElf->Core.pReader->pfnRead(pModElf->Core.pReader, pszName, cbName - 1, off); + if (RT_FAILURE(rc)) + { + /* read by for byte. */ + for (unsigned i = 0; i < cbName; i++, off++) + { + rc = pModElf->Core.pReader->pfnRead(pModElf->Core.pReader, pszName + i, 1, off); + if (RT_FAILURE(rc)) + { + pszName[i] = '\0'; + break; + } + } + } + + pszName[cbName - 1] = '\0'; + return pszName; +} + + +/** + * Validates a section header. + * + * @returns iprt status code. + * @param pModElf Pointer to the module structure. + * @param iShdr The index of section header which should be validated. + * The section headers are found in the pModElf->paShdrs array. + * @param pszLogName The log name. + * @param cbRawImage The size of the raw image. + */ +static int RTLDRELF_NAME(ValidateSectionHeader)(PRTLDRMODELF pModElf, unsigned iShdr, const char *pszLogName, RTFOFF cbRawImage) +{ + const Elf_Shdr *pShdr = &pModElf->paShdrs[iShdr]; + char szSectionName[80]; NOREF(szSectionName); + Log3(("RTLdrELF: Section Header #%d:\n" + "RTLdrELF: sh_name: " FMT_ELF_WORD " - %s\n" + "RTLdrELF: sh_type: " FMT_ELF_WORD " (%s)\n" + "RTLdrELF: sh_flags: " FMT_ELF_XWORD "\n" + "RTLdrELF: sh_addr: " FMT_ELF_ADDR "\n" + "RTLdrELF: sh_offset: " FMT_ELF_OFF "\n" + "RTLdrELF: sh_size: " FMT_ELF_XWORD "\n" + "RTLdrELF: sh_link: " FMT_ELF_WORD "\n" + "RTLdrELF: sh_info: " FMT_ELF_WORD "\n" + "RTLdrELF: sh_addralign: " FMT_ELF_XWORD "\n" + "RTLdrELF: sh_entsize: " FMT_ELF_XWORD "\n", + iShdr, + pShdr->sh_name, RTLDRELF_NAME(GetSHdrName)(pModElf, pShdr->sh_name, szSectionName, sizeof(szSectionName)), + pShdr->sh_type, rtldrElfGetShdrType(pShdr->sh_type), pShdr->sh_flags, pShdr->sh_addr, + pShdr->sh_offset, pShdr->sh_size, pShdr->sh_link, pShdr->sh_info, pShdr->sh_addralign, + pShdr->sh_entsize)); + + if (iShdr == 0) + { + if ( pShdr->sh_name != 0 + || pShdr->sh_type != SHT_NULL + || pShdr->sh_flags != 0 + || pShdr->sh_addr != 0 + || pShdr->sh_size != 0 + || pShdr->sh_offset != 0 + || pShdr->sh_link != SHN_UNDEF + || pShdr->sh_addralign != 0 + || pShdr->sh_entsize != 0 ) + { + Log(("RTLdrELF: %s: Bad #0 section: %.*Rhxs\n", pszLogName, sizeof(*pShdr), pShdr )); + return VERR_BAD_EXE_FORMAT; + } + return VINF_SUCCESS; + } + + if (pShdr->sh_name >= pModElf->cbShStr) + { + Log(("RTLdrELF: %s: Shdr #%d: sh_name (%d) is beyond the end of the section header string table (%d)!\n", + pszLogName, iShdr, pShdr->sh_name, pModElf->cbShStr)); NOREF(pszLogName); + return VERR_BAD_EXE_FORMAT; + } + + if (pShdr->sh_link >= pModElf->Ehdr.e_shnum) + { + Log(("RTLdrELF: %s: Shdr #%d: sh_link (%d) is beyond the end of the section table (%d)!\n", + pszLogName, iShdr, pShdr->sh_link, pModElf->Ehdr.e_shnum)); NOREF(pszLogName); + return VERR_BAD_EXE_FORMAT; + } + + switch (pShdr->sh_type) + { + /** @todo find specs and check up which sh_info fields indicates section table entries */ + case 12301230: + if (pShdr->sh_info >= pModElf->Ehdr.e_shnum) + { + Log(("RTLdrELF: %s: Shdr #%d: sh_info (%d) is beyond the end of the section table (%d)!\n", + pszLogName, iShdr, pShdr->sh_link, pModElf->Ehdr.e_shnum)); + return VERR_BAD_EXE_FORMAT; + } + break; + + case SHT_NULL: + break; + case SHT_PROGBITS: + case SHT_SYMTAB: + case SHT_STRTAB: + case SHT_RELA: + case SHT_HASH: + case SHT_DYNAMIC: + case SHT_NOTE: + case SHT_NOBITS: + case SHT_REL: + case SHT_SHLIB: + case SHT_DYNSYM: + /* + * For these types sh_info doesn't have any special meaning, or anything which + * we need/can validate now. + */ + break; + + + default: + Log(("RTLdrELF: %s: Warning, unknown type %d!\n", pszLogName, pShdr->sh_type)); + break; + } + + if ( pShdr->sh_type != SHT_NOBITS + && pShdr->sh_size) + { + RTFOFF offEnd = pShdr->sh_offset + pShdr->sh_size; + if ( offEnd > cbRawImage + || offEnd < (RTFOFF)pShdr->sh_offset) + { + Log(("RTLdrELF: %s: Shdr #%d: sh_offset (" FMT_ELF_OFF ") + sh_size (" FMT_ELF_XWORD " = %RTfoff) is beyond the end of the file (%RTfoff)!\n", + pszLogName, iShdr, pShdr->sh_offset, pShdr->sh_size, offEnd, cbRawImage)); + return VERR_BAD_EXE_FORMAT; + } + if (pShdr->sh_offset < sizeof(Elf_Ehdr)) + { + Log(("RTLdrELF: %s: Shdr #%d: sh_offset (" FMT_ELF_OFF ") + sh_size (" FMT_ELF_XWORD ") is starting in the ELF header!\n", + pszLogName, iShdr, pShdr->sh_offset, pShdr->sh_size)); + return VERR_BAD_EXE_FORMAT; + } + } + + return VINF_SUCCESS; +} + + + +/** + * Opens an ELF image, fixed bitness. + * + * @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. + */ +static int RTLDRELF_NAME(Open)(PRTLDRREADER pReader, uint32_t fFlags, RTLDRARCH enmArch, PRTLDRMOD phLdrMod) +{ + const char *pszLogName = pReader->pfnLogName(pReader); + RTFOFF cbRawImage = pReader->pfnSize(pReader); + RT_NOREF_PV(fFlags); + + /* + * Create the loader module instance. + */ + PRTLDRMODELF pModElf = (PRTLDRMODELF)RTMemAllocZ(sizeof(*pModElf)); + if (!pModElf) + return VERR_NO_MEMORY; + + pModElf->Core.u32Magic = RTLDRMOD_MAGIC; + pModElf->Core.eState = LDR_STATE_INVALID; + pModElf->Core.pReader = pReader; + pModElf->Core.enmFormat = RTLDRFMT_ELF; + pModElf->Core.enmType = RTLDRTYPE_OBJECT; + pModElf->Core.enmEndian = RTLDRENDIAN_LITTLE; +#if ELF_MODE == 32 + pModElf->Core.enmArch = RTLDRARCH_X86_32; +#else + pModElf->Core.enmArch = RTLDRARCH_AMD64; +#endif + //pModElf->pvBits = NULL; + //pModElf->Ehdr = {0}; + //pModElf->paShdrs = NULL; + //pModElf->paSyms = NULL; + pModElf->iSymSh = ~0U; + //pModElf->cSyms = 0; + pModElf->iStrSh = ~0U; + //pModElf->cbStr = 0; + //pModElf->cbImage = 0; + //pModElf->LinkAddress = 0; + //pModElf->pStr = NULL; + //pModElf->cbShStr = 0; + //pModElf->pShStr = NULL; + //pModElf->iShEhFrame = 0; + //pModElf->iShEhFrameHdr = 0; + + /* + * Read and validate the ELF header and match up the CPU architecture. + */ + int rc = pReader->pfnRead(pReader, &pModElf->Ehdr, sizeof(pModElf->Ehdr), 0); + if (RT_SUCCESS(rc)) + { + RTLDRARCH enmArchImage = RTLDRARCH_INVALID; /* shut up gcc */ + rc = RTLDRELF_NAME(ValidateElfHeader)(&pModElf->Ehdr, pszLogName, cbRawImage, &enmArchImage); + if (RT_SUCCESS(rc)) + { + if ( enmArch != RTLDRARCH_WHATEVER + && enmArch != enmArchImage) + rc = VERR_LDR_ARCH_MISMATCH; + } + } + if (RT_SUCCESS(rc)) + { + /* + * Read the section headers, keeping a prestine copy for the module + * introspection methods. + */ + size_t const cbShdrs = pModElf->Ehdr.e_shnum * sizeof(Elf_Shdr); + Elf_Shdr *paShdrs = (Elf_Shdr *)RTMemAlloc(cbShdrs * 2); + if (paShdrs) + { + pModElf->paShdrs = paShdrs; + rc = pReader->pfnRead(pReader, paShdrs, cbShdrs, pModElf->Ehdr.e_shoff); + if (RT_SUCCESS(rc)) + { + memcpy(&paShdrs[pModElf->Ehdr.e_shnum], paShdrs, cbShdrs); + pModElf->paOrgShdrs = &paShdrs[pModElf->Ehdr.e_shnum]; + + pModElf->cbShStr = paShdrs[pModElf->Ehdr.e_shstrndx].sh_size; + + /* + * Validate the section headers and find relevant sections. + */ + Elf_Addr uNextAddr = 0; + for (unsigned i = 0; i < pModElf->Ehdr.e_shnum; i++) + { + rc = RTLDRELF_NAME(ValidateSectionHeader)(pModElf, i, pszLogName, cbRawImage); + if (RT_FAILURE(rc)) + break; + + /* We're looking for symbol tables. */ + if (paShdrs[i].sh_type == SHT_SYMTAB) + { + if (pModElf->iSymSh != ~0U) + { + Log(("RTLdrElf: %s: Multiple symbol tabs! iSymSh=%d i=%d\n", pszLogName, pModElf->iSymSh, i)); + rc = VERR_LDRELF_MULTIPLE_SYMTABS; + break; + } + pModElf->iSymSh = i; + pModElf->cSyms = (unsigned)(paShdrs[i].sh_size / sizeof(Elf_Sym)); + AssertReturn(pModElf->cSyms == paShdrs[i].sh_size / sizeof(Elf_Sym), VERR_IMAGE_TOO_BIG); + pModElf->iStrSh = paShdrs[i].sh_link; + pModElf->cbStr = (unsigned)paShdrs[pModElf->iStrSh].sh_size; + AssertReturn(pModElf->cbStr == paShdrs[pModElf->iStrSh].sh_size, VERR_IMAGE_TOO_BIG); + } + + /* Special checks for the section string table. */ + if (i == pModElf->Ehdr.e_shstrndx) + { + if (paShdrs[i].sh_type != SHT_STRTAB) + { + Log(("RTLdrElf: Section header string table is not a SHT_STRTAB: %#x\n", paShdrs[i].sh_type)); + rc = VERR_BAD_EXE_FORMAT; + break; + } + if (paShdrs[i].sh_size == 0) + { + Log(("RTLdrElf: Section header string table is empty\n")); + rc = VERR_BAD_EXE_FORMAT; + break; + } + } + + /* Kluge for the .data..percpu segment in 64-bit linux kernels. */ + if (paShdrs[i].sh_flags & SHF_ALLOC) + { + if ( paShdrs[i].sh_addr == 0 + && paShdrs[i].sh_addr < uNextAddr) + { + Elf_Addr uAddr = RT_ALIGN_T(uNextAddr, paShdrs[i].sh_addralign, Elf_Addr); + Log(("RTLdrElf: Out of order section #%d; adjusting sh_addr from " FMT_ELF_ADDR " to " FMT_ELF_ADDR "\n", + i, paShdrs[i].sh_addr, uAddr)); + paShdrs[i].sh_addr = uAddr; + } + uNextAddr = paShdrs[i].sh_addr + paShdrs[i].sh_size; + } + } /* for each section header */ + + /* + * Calculate the image base address if the image isn't relocatable. + */ + if (RT_SUCCESS(rc) && pModElf->Ehdr.e_type != ET_REL) + { + pModElf->LinkAddress = ~(Elf_Addr)0; + for (unsigned i = 0; i < pModElf->Ehdr.e_shnum; i++) + if ( (paShdrs[i].sh_flags & SHF_ALLOC) + && paShdrs[i].sh_addr < pModElf->LinkAddress) + pModElf->LinkAddress = paShdrs[i].sh_addr; + if (pModElf->LinkAddress == ~(Elf_Addr)0) + { + AssertFailed(); + rc = VERR_LDR_GENERAL_FAILURE; + } + if (pModElf->Ehdr.e_type == ET_DYN && pModElf->LinkAddress < 0x1000) + pModElf->LinkAddress = 0; + } + + /* + * Perform allocations / RVA calculations, determine the image size. + */ + if (RT_SUCCESS(rc)) + for (unsigned i = 0; i < pModElf->Ehdr.e_shnum; i++) + if (paShdrs[i].sh_flags & SHF_ALLOC) + { + if (pModElf->Ehdr.e_type == ET_REL) + paShdrs[i].sh_addr = paShdrs[i].sh_addralign + ? RT_ALIGN_T(pModElf->cbImage, paShdrs[i].sh_addralign, Elf_Addr) + : (Elf_Addr)pModElf->cbImage; + else + paShdrs[i].sh_addr -= pModElf->LinkAddress; + Elf_Addr EndAddr = paShdrs[i].sh_addr + paShdrs[i].sh_size; + if (pModElf->cbImage < EndAddr) + { + pModElf->cbImage = (size_t)EndAddr; + AssertMsgReturn(pModElf->cbImage == EndAddr, (FMT_ELF_ADDR "\n", EndAddr), VERR_IMAGE_TOO_BIG); + } + Log2(("RTLdrElf: %s: Assigned " FMT_ELF_ADDR " to section #%d\n", pszLogName, paShdrs[i].sh_addr, i)); + } + + Log2(("RTLdrElf: iSymSh=%u cSyms=%u iStrSh=%u cbStr=%u rc=%Rrc cbImage=%#zx LinkAddress=" FMT_ELF_ADDR "\n", + pModElf->iSymSh, pModElf->cSyms, pModElf->iStrSh, pModElf->cbStr, rc, + pModElf->cbImage, pModElf->LinkAddress)); + if (RT_SUCCESS(rc)) + { + pModElf->Core.pOps = &RTLDRELF_MID(s_rtldrElf,Ops); + pModElf->Core.eState = LDR_STATE_OPENED; + *phLdrMod = &pModElf->Core; + + LogFlow(("%s: %s: returns VINF_SUCCESS *phLdrMod=%p\n", __FUNCTION__, pszLogName, *phLdrMod)); + return VINF_SUCCESS; + } + } + + RTMemFree(paShdrs); + } + else + rc = VERR_NO_MEMORY; + } + + RTMemFree(pModElf); + LogFlow(("%s: returns %Rrc\n", __FUNCTION__, rc)); + return rc; +} + + + + +/******************************************************************************* +* Cleanup Constants And Macros * +*******************************************************************************/ +#undef RTLDRELF_NAME +#undef RTLDRELF_SUFF +#undef RTLDRELF_MID + +#undef FMT_ELF_ADDR +#undef FMT_ELF_HALF +#undef FMT_ELF_SHALF +#undef FMT_ELF_OFF +#undef FMT_ELF_SIZE +#undef FMT_ELF_SWORD +#undef FMT_ELF_WORD +#undef FMT_ELF_XWORD +#undef FMT_ELF_SXWORD + +#undef Elf_Ehdr +#undef Elf_Phdr +#undef Elf_Shdr +#undef Elf_Sym +#undef Elf_Rel +#undef Elf_Rela +#undef Elf_Reloc +#undef Elf_Nhdr +#undef Elf_Dyn + +#undef Elf_Addr +#undef Elf_Half +#undef Elf_Off +#undef Elf_Size +#undef Elf_Sword +#undef Elf_Word + +#undef RTLDRMODELF +#undef PRTLDRMODELF + +#undef ELF_R_SYM +#undef ELF_R_TYPE +#undef ELF_R_INFO + +#undef ELF_ST_BIND + |