/* $Id: ldrVfsFile.cpp 82968 2020-02-04 10:35:17Z vboxsync $ */ /** @file * IPRT - Binary Image Loader, The File Oriented Parts, VFS variant. */ /* * 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 #include "internal/iprt.h" #include #include #include #include #include #include #include #include #include "internal/ldr.h" /********************************************************************************************************************************* * Structures and Typedefs * *********************************************************************************************************************************/ /** * VFS file Reader instance. * This provides raw image bits from a file. */ typedef struct RTLDRREADERVFSFILE { /** The core. */ RTLDRREADER Core; /** The VFS file. */ RTVFSFILE hVfsFile; /** Number of users or the mapping. */ RTUINT cMappings; /** Pointer to the in memory mapping. */ void *pvMapping; /** The filename (variable size). */ char szFilename[1]; } RTLDRREADERVFSFILE; typedef RTLDRREADERVFSFILE *PRTLDRREADERVFSFILE; /** @copydoc RTLDRREADER::pfnRead */ static DECLCALLBACK(int) rtldrVfsFileRead(PRTLDRREADER pReader, void *pvBuf, size_t cb, RTFOFF off) { PRTLDRREADERVFSFILE pFileReader = (PRTLDRREADERVFSFILE)pReader; return RTVfsFileReadAt(pFileReader->hVfsFile, off, pvBuf, cb, NULL); } /** @copydoc RTLDRREADER::pfnTell */ static DECLCALLBACK(RTFOFF) rtldrVfsFileTell(PRTLDRREADER pReader) { PRTLDRREADERVFSFILE pFileReader = (PRTLDRREADERVFSFILE)pReader; return RTVfsFileTell(pFileReader->hVfsFile); } /** @copydoc RTLDRREADER::pfnSize */ static DECLCALLBACK(uint64_t) rtldrVfsFileSize(PRTLDRREADER pReader) { PRTLDRREADERVFSFILE pFileReader = (PRTLDRREADERVFSFILE)pReader; uint64_t cbFile; int rc = RTVfsFileQuerySize(pFileReader->hVfsFile, &cbFile); if (RT_SUCCESS(rc)) return cbFile; return 0; } /** @copydoc RTLDRREADER::pfnLogName */ static DECLCALLBACK(const char *) rtldrVfsFileLogName(PRTLDRREADER pReader) { PRTLDRREADERVFSFILE pFileReader = (PRTLDRREADERVFSFILE)pReader; return pFileReader->szFilename; } /** @copydoc RTLDRREADER::pfnMap */ static DECLCALLBACK(int) rtldrVfsFileMap(PRTLDRREADER pReader, const void **ppvBits) { PRTLDRREADERVFSFILE pFileReader = (PRTLDRREADERVFSFILE)pReader; /* * Already mapped? */ if (pFileReader->pvMapping) { pFileReader->cMappings++; *ppvBits = pFileReader->pvMapping; return VINF_SUCCESS; } /* * Allocate memory. */ uint64_t cbFile = rtldrVfsFileSize(pReader); size_t cb = (size_t)cbFile; if ((uint64_t)cb != cbFile) return VERR_IMAGE_TOO_BIG; pFileReader->pvMapping = RTMemAlloc(cb); if (!pFileReader->pvMapping) return VERR_NO_MEMORY; int rc = rtldrVfsFileRead(pReader, pFileReader->pvMapping, cb, 0); if (RT_SUCCESS(rc)) { pFileReader->cMappings = 1; *ppvBits = pFileReader->pvMapping; } else { RTMemFree(pFileReader->pvMapping); pFileReader->pvMapping = NULL; } return rc; } /** @copydoc RTLDRREADER::pfnUnmap */ static DECLCALLBACK(int) rtldrVfsFileUnmap(PRTLDRREADER pReader, const void *pvBits) { PRTLDRREADERVFSFILE pFileReader = (PRTLDRREADERVFSFILE)pReader; AssertReturn(pFileReader->cMappings > 0, VERR_INVALID_PARAMETER); if (!--pFileReader->cMappings) { RTMemFree(pFileReader->pvMapping); pFileReader->pvMapping = NULL; } NOREF(pvBits); return VINF_SUCCESS; } /** @copydoc RTLDRREADER::pfnDestroy */ static DECLCALLBACK(int) rtldrVfsFileDestroy(PRTLDRREADER pReader) { PRTLDRREADERVFSFILE pFileReader = (PRTLDRREADERVFSFILE)pReader; if (pFileReader->hVfsFile != NIL_RTVFSFILE) { RTVfsFileRelease(pFileReader->hVfsFile); pFileReader->hVfsFile = NIL_RTVFSFILE; } RTMemFree(pFileReader); return VINF_SUCCESS; } /** * Opens a loader file reader. * * @returns iprt status code. * @param pszFilename The file to open, can be VFS chain. * @param ppReader Where to store the reader instance on success. * @param poffError Where to return the offset into @a pszFilename of an VFS * chain element causing trouble. Optional. * @param pErrInfo Where to return extended error information. Optional. */ static int rtldrVfsFileCreate(const char *pszFilename, PRTLDRREADER *ppReader, uint32_t *poffError, PRTERRINFO pErrInfo) { size_t cbFilename = strlen(pszFilename) + 1; int rc = VERR_NO_MEMORY; PRTLDRREADERVFSFILE pFileReader = (PRTLDRREADERVFSFILE)RTMemAlloc(RT_UOFFSETOF_DYN(RTLDRREADERVFSFILE, szFilename[cbFilename])); if (pFileReader) { memcpy(pFileReader->szFilename, pszFilename, cbFilename); pFileReader->szFilename[0] = '\0'; rc = RTVfsChainOpenFile(pszFilename, RTFILE_O_READ | RTFILE_O_OPEN | RTFILE_O_DENY_WRITE, &pFileReader->hVfsFile, poffError, pErrInfo); if (RT_SUCCESS(rc)) { pFileReader->Core.uMagic = RTLDRREADER_MAGIC; pFileReader->Core.pfnRead = rtldrVfsFileRead; pFileReader->Core.pfnTell = rtldrVfsFileTell; pFileReader->Core.pfnSize = rtldrVfsFileSize; pFileReader->Core.pfnLogName = rtldrVfsFileLogName; pFileReader->Core.pfnMap = rtldrVfsFileMap; pFileReader->Core.pfnUnmap = rtldrVfsFileUnmap; pFileReader->Core.pfnDestroy = rtldrVfsFileDestroy; pFileReader->cMappings = 0; pFileReader->pvMapping = NULL; *ppReader = &pFileReader->Core; return VINF_SUCCESS; } RTMemFree(pFileReader); } *ppReader = NULL; return rc; } /** * Open a binary image file allowing VFS chains in the filename. * * @returns iprt status code. * @param pszFilename Image filename, VFS chain specifiers allowed. * @param fFlags Valid RTLDR_O_XXX combination. * @param enmArch CPU architecture specifier for the image to be loaded. * @param phLdrMod Where to store the handle to the loader module. * @param poffError Where to return the offset into @a pszFilename of an VFS * chain element causing trouble. Optional. * @param pErrInfo Where to return extended error information. Optional. */ RTDECL(int) RTLdrOpenVfsChain(const char *pszFilename, uint32_t fFlags, RTLDRARCH enmArch, PRTLDRMOD phLdrMod, uint32_t *poffError, PRTERRINFO pErrInfo) { LogFlow(("RTLdrOpenVfsChain: pszFilename=%p:{%s} fFlags=%#x enmArch=%d phLdrMod=%p\n", pszFilename, pszFilename, fFlags, enmArch, phLdrMod)); AssertMsgReturn(!(fFlags & ~RTLDR_O_VALID_MASK), ("%#x\n", fFlags), VERR_INVALID_PARAMETER); AssertMsgReturn(enmArch > RTLDRARCH_INVALID && enmArch < RTLDRARCH_END, ("%d\n", enmArch), VERR_INVALID_PARAMETER); /* * Create file reader & invoke worker which identifies and calls the image interpreter. */ PRTLDRREADER pReader; int rc = rtldrVfsFileCreate(pszFilename, &pReader, poffError, pErrInfo); if (RT_SUCCESS(rc)) { if (poffError) *poffError = 0; rc = RTLdrOpenWithReader(pReader, fFlags, enmArch, phLdrMod, pErrInfo); if (RT_SUCCESS(rc)) { LogFlow(("RTLdrOpenEx: return %Rrc *phLdrMod=%p\n", rc, *phLdrMod)); return rc; } pReader->pfnDestroy(pReader); } *phLdrMod = NIL_RTLDRMOD; LogFlow(("RTLdrOpenEx: return %Rrc\n", rc)); return rc; } RT_EXPORT_SYMBOL(RTLdrOpenVfsChain); /** * Open a binary image file using kLdr allowing VFS chains in the filename. * * @returns iprt status code. * @param pszFilename Image filename. * @param fFlags Reserved, MBZ. * @param enmArch CPU architecture specifier for the image to be loaded. * @param phLdrMod Where to store the handle to the loaded module. * @param poffError Where to return the offset into @a pszFilename of an VFS * chain element causing trouble. Optional. * @param pErrInfo Where to return extended error information. Optional. * @remark Primarily for testing the loader. */ RTDECL(int) RTLdrOpenVfsChainkLdr(const char *pszFilename, uint32_t fFlags, RTLDRARCH enmArch, PRTLDRMOD phLdrMod, uint32_t *poffError, PRTERRINFO pErrInfo) { return RTLdrOpenVfsChain(pszFilename, fFlags, enmArch, phLdrMod, poffError, pErrInfo); } RT_EXPORT_SYMBOL(RTLdrOpenVfsChainkLdr);