| 1 | /* $Id: ldrNative-posix.cpp 106061 2024-09-16 14:03:52Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Binary Image Loader, POSIX native.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2024 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * The contents of this file may alternatively be used under the terms
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| 26 | * of the Common Development and Distribution License Version 1.0
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| 27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | * in the VirtualBox distribution, in which case the provisions of the
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| 29 | * CDDL are applicable instead of those of the GPL.
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| 30 | *
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| 31 | * You may elect to license modified versions of this file under the
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| 32 | * terms and conditions of either the GPL or the CDDL or both.
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| 33 | *
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| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 35 | */
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| 36 |
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| 37 |
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| 38 | /*********************************************************************************************************************************
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| 39 | * Header Files *
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| 40 | *********************************************************************************************************************************/
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| 41 | #define LOG_GROUP RTLOGGROUP_LDR
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| 42 | #include <dlfcn.h>
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| 43 |
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| 44 | #include <iprt/ldr.h>
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| 45 | #include <iprt/assert.h>
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| 46 | #include <iprt/path.h>
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| 47 | #include <iprt/alloca.h>
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| 48 | #include <iprt/string.h>
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| 49 | #include <iprt/err.h>
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| 50 | #include <iprt/log.h>
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| 51 | #include "internal/ldr.h"
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| 52 |
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| 53 |
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| 54 | /*********************************************************************************************************************************
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| 55 | * Global Variables *
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| 56 | *********************************************************************************************************************************/
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| 57 | #if defined(RT_OS_OS2) || defined(RT_OS_WINDOWS)
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| 58 | static const char g_szSuff[] = ".DLL";
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| 59 | #elif defined(RT_OS_L4)
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| 60 | static const char g_szSuff[] = ".s.so";
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| 61 | #elif defined(RT_OS_DARWIN)
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| 62 | static const char g_szSuff[] = ".dylib";
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| 63 | #else
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| 64 | static const char g_szSuff[] = ".so";
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| 65 | #endif
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| 66 |
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| 67 |
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| 68 | DECLHIDDEN(int) rtldrNativeLoad(const char *pszFilename, uintptr_t *phHandle, uint32_t fFlags, PRTERRINFO pErrInfo)
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| 69 | {
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| 70 | /*
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| 71 | * Do we need to add an extension?
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| 72 | */
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| 73 | if (!RTPathHasSuffix(pszFilename) && !(fFlags & RTLDRLOAD_FLAGS_NO_SUFFIX))
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| 74 | {
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| 75 | size_t cch = strlen(pszFilename);
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| 76 | char *psz = (char *)alloca(cch + sizeof(g_szSuff));
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| 77 | if (!psz)
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| 78 | return RTErrInfoSet(pErrInfo, VERR_NO_MEMORY, "alloca failed");
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| 79 | memcpy(psz, pszFilename, cch);
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| 80 | memcpy(psz + cch, g_szSuff, sizeof(g_szSuff));
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| 81 | pszFilename = psz;
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| 82 | }
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| 83 |
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| 84 | /*
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| 85 | * Attempt load.
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| 86 | */
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| 87 | int fFlagsNative = RTLD_NOW;
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| 88 | if (fFlags & RTLDRLOAD_FLAGS_GLOBAL)
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| 89 | fFlagsNative |= RTLD_GLOBAL;
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| 90 | else
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| 91 | fFlagsNative |= RTLD_LOCAL;
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| 92 | void *pvMod = dlopen(pszFilename, fFlagsNative);
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| 93 | if (pvMod)
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| 94 | {
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| 95 | *phHandle = (uintptr_t)pvMod;
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| 96 | return VINF_SUCCESS;
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| 97 | }
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| 98 |
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| 99 | const char *pszDlError = dlerror();
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| 100 | RTErrInfoSet(pErrInfo, VERR_FILE_NOT_FOUND, pszDlError);
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| 101 | LogRel(("rtldrNativeLoad: dlopen('%s', RTLD_NOW | RTLD_LOCAL) failed: %s\n", pszFilename, pszDlError));
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| 102 | return VERR_FILE_NOT_FOUND;
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| 103 | }
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| 104 |
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| 105 |
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| 106 | DECLCALLBACK(int) rtldrNativeGetSymbol(PRTLDRMODINTERNAL pMod, const char *pszSymbol, void **ppvValue)
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| 107 | {
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| 108 | PRTLDRMODNATIVE pModNative = (PRTLDRMODNATIVE)pMod;
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| 109 | #ifdef RT_OS_OS2
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| 110 | /* Prefix the symbol with an underscore (assuming __cdecl/gcc-default). */
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| 111 | size_t cch = strlen(pszSymbol);
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| 112 | char *psz = (char *)alloca(cch + 2);
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| 113 | psz[0] = '_';
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| 114 | memcpy(psz + 1, pszSymbol, cch + 1);
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| 115 | pszSymbol = psz;
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| 116 | #endif
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| 117 | *ppvValue = dlsym((void *)pModNative->hNative, pszSymbol);
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| 118 | if (*ppvValue)
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| 119 | return VINF_SUCCESS;
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| 120 | return VERR_SYMBOL_NOT_FOUND;
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| 121 | }
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| 122 |
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| 123 |
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| 124 | DECLCALLBACK(int) rtldrNativeClose(PRTLDRMODINTERNAL pMod)
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| 125 | {
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| 126 | PRTLDRMODNATIVE pModNative = (PRTLDRMODNATIVE)pMod;
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| 127 | #ifdef __SANITIZE_ADDRESS__
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| 128 | /* If we are compiled with enabled address sanitizer (gcc/llvm), don't
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| 129 | * unload the module to prevent <unknown module> in the stack trace */
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| 130 | pModNative->fFlags |= RTLDRLOAD_FLAGS_NO_UNLOAD;
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| 131 | #endif
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| 132 | if ( (pModNative->fFlags & RTLDRLOAD_FLAGS_NO_UNLOAD)
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| 133 | || !dlclose((void *)pModNative->hNative))
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| 134 | {
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| 135 | pModNative->hNative = (uintptr_t)0;
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| 136 | return VINF_SUCCESS;
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| 137 | }
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| 138 | Log(("rtldrNativeFree: dlclose(%p) failed: %s\n", pModNative->hNative, dlerror()));
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| 139 | return VERR_GENERAL_FAILURE;
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| 140 | }
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| 141 |
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| 142 |
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| 143 | DECLHIDDEN(int) rtldrNativeLoadSystem(const char *pszFilename, const char *pszExt, uint32_t fFlags, PRTLDRMOD phLdrMod)
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| 144 | {
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| 145 | /*
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| 146 | * For the present we ASSUME that we can trust dlopen to load what we want
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| 147 | * when not specifying a path. There seems to be very little we can do to
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| 148 | * restrict the places dlopen will search for library without doing
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| 149 | * auditing (linux) or something like that.
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| 150 | */
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| 151 | Assert(strchr(pszFilename, '/') == NULL);
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| 152 |
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| 153 | uint32_t const fFlags2 = fFlags & ~(RTLDRLOAD_FLAGS_SO_VER_BEGIN_MASK | RTLDRLOAD_FLAGS_SO_VER_END_MASK);
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| 154 |
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| 155 | /*
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| 156 | * If no suffix is given and we haven't got any RTLDRLOAD_FLAGS_SO_VER_ range to work
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| 157 | * with, we can call RTLdrLoadEx directly.
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| 158 | */
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| 159 | if (!pszExt)
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| 160 | {
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| 161 | #if !defined(RT_OS_DARWIN) && !defined(RT_OS_OS2) && !defined(RT_OS_WINDOWS)
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| 162 | if ( (fFlags & RTLDRLOAD_FLAGS_SO_VER_BEGIN_MASK) >> RTLDRLOAD_FLAGS_SO_VER_BEGIN_SHIFT
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| 163 | == (fFlags & RTLDRLOAD_FLAGS_SO_VER_END_MASK) >> RTLDRLOAD_FLAGS_SO_VER_END_SHIFT)
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| 164 | #endif
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| 165 | return RTLdrLoadEx(pszFilename, phLdrMod, fFlags2, NULL);
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| 166 | pszExt = "";
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| 167 | }
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| 168 |
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| 169 | /*
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| 170 | * Combine filename and suffix and then do the loading.
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| 171 | */
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| 172 | size_t const cchFilename = strlen(pszFilename);
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| 173 | size_t const cchSuffix = strlen(pszExt);
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| 174 | char *pszTmp = (char *)alloca(cchFilename + cchSuffix + 16 + 1);
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| 175 | memcpy(pszTmp, pszFilename, cchFilename);
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| 176 | memcpy(&pszTmp[cchFilename], pszExt, cchSuffix);
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| 177 | pszTmp[cchFilename + cchSuffix] = '\0';
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| 178 |
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| 179 | int rc = RTLdrLoadEx(pszTmp, phLdrMod, fFlags2, NULL);
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| 180 |
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| 181 | #if !defined(RT_OS_DARWIN) && !defined(RT_OS_OS2) && !defined(RT_OS_WINDOWS)
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| 182 | /*
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| 183 | * If no version was given after the .so and do .so.MAJOR search according
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| 184 | * to the range in the fFlags.
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| 185 | */
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| 186 | if (RT_FAILURE(rc) && !(fFlags & RTLDRLOAD_FLAGS_NO_SUFFIX))
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| 187 | {
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| 188 | const char *pszActualSuff = RTPathSuffix(pszTmp);
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| 189 | if (pszActualSuff && strcmp(pszActualSuff, ".so") == 0)
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| 190 | {
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| 191 | int32_t const iBegin = (fFlags & RTLDRLOAD_FLAGS_SO_VER_BEGIN_MASK) >> RTLDRLOAD_FLAGS_SO_VER_BEGIN_SHIFT;
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| 192 | int32_t const iEnd = (fFlags & RTLDRLOAD_FLAGS_SO_VER_END_MASK) >> RTLDRLOAD_FLAGS_SO_VER_END_SHIFT;
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| 193 | int32_t const iIncr = iBegin <= iEnd ? 1 : -1;
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| 194 | for (int32_t iMajorVer = iBegin; iMajorVer != iEnd; iMajorVer += iIncr)
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| 195 | {
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| 196 | RTStrPrintf(&pszTmp[cchFilename + cchSuffix], 16 + 1, ".%d", iMajorVer);
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| 197 | rc = RTLdrLoadEx(pszTmp, phLdrMod, fFlags2, NULL);
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| 198 | if (RT_SUCCESS(rc))
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| 199 | break;
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| 200 | }
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| 201 | }
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| 202 | }
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| 203 | #endif
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| 204 |
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| 205 | return rc;
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| 206 | }
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| 207 |
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