1 | /* $Id: ldrNative-posix.cpp 98103 2023-01-17 14:15:46Z 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) 2006-2023 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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