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0
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1 /*
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2 * Copyright (c) 1995 by Sun Microsystems, Inc.
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3 * All rights reserved.
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4 *
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5 * This source code is a product of Sun Microsystems, Inc. and is provided
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6 * for unrestricted use provided that this legend is included on all tape
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7 * media and as a part of the software program in whole or part. Users
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8 * may copy or modify this source code without charge, but are not authorized
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9 * to license or distribute it to anyone else except as part of a product or
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10 * program developed by the user.
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11 *
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12 * THIS PROGRAM CONTAINS SOURCE CODE COPYRIGHTED BY SUN MICROSYSTEMS, INC.
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13 * SUN MICROSYSTEMS, INC., MAKES NO REPRESENTATIONS ABOUT THE SUITABLITY
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14 * OF SUCH SOURCE CODE FOR ANY PURPOSE. IT IS PROVIDED "AS IS" WITHOUT
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15 * EXPRESS OR IMPLIED WARRANTY OF ANY KIND. SUN MICROSYSTEMS, INC. DISCLAIMS
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16 * ALL WARRANTIES WITH REGARD TO SUCH SOURCE CODE, INCLUDING ALL IMPLIED
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17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN
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18 * NO EVENT SHALL SUN MICROSYSTEMS, INC. BE LIABLE FOR ANY SPECIAL, INDIRECT,
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19 * INCIDENTAL, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
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20 * FROM USE OF SUCH SOURCE CODE, REGARDLESS OF THE THEORY OF LIABILITY.
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21 *
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22 * This source code is provided with no support and without any obligation on
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23 * the part of Sun Microsystems, Inc. to assist in its use, correction,
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24 * modification or enhancement.
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25 *
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26 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
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27 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY THIS
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28 * SOURCE CODE OR ANY PART THEREOF.
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29 *
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30 * Sun Microsystems, Inc.
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31 * 2550 Garcia Avenue
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32 * Mountain View, California 94043
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33 */
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34
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35 /*
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36 * dynodump(3x) dumps a running executable into a specified ELF file. The new
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37 * file consists of the memory contents of the original file together with any
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38 * heap. This heap is assigned to a new `.heap' section within the new file.
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39 *
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40 * The new file may be re-executed, and will contain any data modifications
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41 * made to the original image up until the time dynodump(3x) was called.
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42 *
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43 * The original image may have undergone relocations (performed by ld.so.1)
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44 * prior to control being transferred to the image. These relocations will
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45 * reside as the data copied from the image. To prevent subsequent executions
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46 * of the new image from undergoing the same relocations, any relocation entries
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47 * (besides copy or jump slot relocations) are nulled out. Note that copy
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48 * relocations such as required for __iob must be reinitialized each time the
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49 * process starts, so it is not sufficient to simply null out the .dynamic
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50 * sections relocation information. The effect of this is that if the new
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51 * image was bound to definitions in any shared object dependencies, then these
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52 * dependencies *must* reside in the same location as when dynodump(3x) was
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53 * called. Any changes to the shared object dependencies of the new image, or
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54 * uses of such things as LD_PRELOAD, may result in the bindings encoded in the
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55 * image becoming invalid.
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56 *
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57 * The following flags modify the data of the image created:
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58 *
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59 * RTLD_SAVREL save the original relocation data. Under this option any
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60 * relocation offset is reset to contain the same data as was
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61 * found in the images original file.
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62 *
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63 * This option allows relocation information to be retained in the
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64 * new image so that it may be re-executed when the new image is
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65 * run. This allows far greater flexibility as the new image can
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66 * now take advantage of new shared objects.
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67 *
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68 * Note. under this mechanism, any data item that undergoes
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69 * relocation and is then further modified during the execution of
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70 * the image before dynodump(3x) is called will lose the
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71 * modification that occured during the applications execution.
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72 *
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73 * N.B. The above commentary is not quite correct in the flags have been hardwired
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74 * to RTLD_SAVREL.
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75 */
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76 #pragma ident "@(#) $Id: dynodump.c,v 1.1.1.1 1996/12/18 03:37:22 steve Exp $ - SMI"
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77
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78 #include <sys/param.h>
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79 #include <sys/procfs.h>
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80 #include <fcntl.h>
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81 #include <stdio.h>
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82 #include <libelf.h>
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83 #include <link.h>
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84 #include <stdlib.h>
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85 #include <string.h>
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86 #include <unistd.h>
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87 #include <errno.h>
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88 #include <malloc.h>
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89 #include "machdep.h"
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90 #include "_dynodump.h"
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91
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92 /*
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93 * Generic elf error message generator
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94 */
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95 static int
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96 elferr(const char * str)
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97 {
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98 fprintf(stderr, "%s: %s\n", str, elf_errmsg(elf_errno()));
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99 return (1);
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100 }
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101
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102 int
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103 dynodump(const char * file)
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104 {
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105 Elf *ielf, *oelf;
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106 Ehdr *iehdr, *oehdr;
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107 Phdr *iphdr, *ophdr, *data_phdr = 0;
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108 Cache *icache, *ocache, *_icache, *_ocache;
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109 Cache *data_cache = 0, *shstr_cache = 0;
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110 Cache *heap_cache = 0;
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111 Word heap_sz = 0;
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112 Elf_Scn *scn;
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113 Shdr *shdr;
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114 Elf_Data *data, rundata;
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115 Half ndx, _ndx;
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116 int fd, _fd;
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117 Addr edata, _addr;
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118 char *istrs, *ostrs, *_ostrs, proc[16];
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119 const char heap[] = ".heap";
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120 prstatus_t pstat;
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121
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122 /* make a call to the processor specific un-init stuff */
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123 dynodump_uninit();
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124
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125 /*
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126 * Obtain a file descriptor for this process,
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127 * for the executable and get a prstatus_t
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128 * structure.
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129 */
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130 sprintf(proc, "/proc/%ld", getpid());
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131 if (((_fd = open(proc, O_RDONLY, 0)) == -1) ||
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132 ((fd = ioctl(_fd, PIOCOPENM, (void *)0)) == -1) ||
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133 (ioctl(_fd, PIOCSTATUS, &pstat) == -1)) {
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134 fprintf(stderr, "/proc: initialization error: %s\n",
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135 strerror(errno));
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136 close(_fd);
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137 return (1);
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138 }
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139 close(_fd);
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140
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141 /*
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142 * Initialize with the ELF library and make sure this is an executable
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143 * ELF file we're dealing with.
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144 */
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145 elf_version(EV_CURRENT);
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146 if ((ielf = elf_begin(fd, ELF_C_READ, NULL)) == NULL) {
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147 close(fd);
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148 return (elferr("elf_begin"));
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149 }
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150 close(fd);
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151
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152 if ((elf_kind(ielf) != ELF_K_ELF) ||
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153 ((iehdr = elf_getehdr(ielf)) == NULL) ||
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154 (iehdr->e_type != ET_EXEC)) {
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155 fprintf(stderr, "image is not an ELF executable\n");
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156 elf_end(ielf);
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157 return (1);
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158 }
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159 /*
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160 * Elf_elf_header(iehdr);
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161 */
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162
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163 /*
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164 * Create the new output file.
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165 */
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166 if ((fd = open(file, O_RDWR | O_CREAT | O_TRUNC, 0777)) == -1) {
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167 fprintf(stderr, "%s: open failed: %s\n", file,
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168 strerror(errno));
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169 elf_end(ielf);
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170 return (1);
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171 }
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172 if ((oelf = elf_begin(fd, ELF_C_WRITE, NULL)) == NULL) {
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173 elf_end(ielf);
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174 close(fd);
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175 return (elferr("elf_begin"));
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176 }
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177
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178 /*
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179 * Obtain the input program headers. Remember the data segments
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180 * program header entry as this will be updated later to reflect the
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181 * new .heap sections size.
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182 */
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183 if ((iphdr = elf_getphdr(ielf)) == NULL)
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184 return (elferr("elf_getphdr"));
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185
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186 for (ndx = 0, ophdr = iphdr; ndx != iehdr->e_phnum; ndx++, ophdr++) {
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187 /*
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188 * Save the program header that contains the NOBITS section, or
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189 * the last loadable program header if no NOBITS exists.
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190 * A NOBITS section translates to a memory size requirement that
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191 * is greater than the file data it is mapped from.
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192 */
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193 if (ophdr->p_type == PT_LOAD) {
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194 if (ophdr->p_filesz != ophdr->p_memsz)
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195 data_phdr = ophdr;
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196 else if (data_phdr) {
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197 if (data_phdr->p_vaddr < ophdr->p_vaddr)
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198 data_phdr = ophdr;
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199 } else
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200 data_phdr = ophdr;
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201 }
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202 }
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203 if (data_phdr == 0) {
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204 fprintf(stderr, "no data segment found!\n");
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205 return (0);
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206 }
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207
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208 /*
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209 * Obtain the input files section header string table.
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210 */
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211 if ((scn = elf_getscn(ielf, iehdr->e_shstrndx)) == NULL)
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212 return (elferr("elf_getscn"));
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213 if ((data = elf_getdata(scn, NULL)) == NULL)
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214 return (elferr("elf_getdata"));
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215 istrs = data->d_buf;
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216
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217 /*
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218 * Construct a cache to maintain the input files section information.
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219 */
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220 if ((icache = (Cache *) malloc(iehdr->e_shnum * sizeof (Cache))) == 0) {
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221 fprintf(stderr, "malloc failed: %s\n", strerror(errno));
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222 return (1);
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223 }
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224 _icache = icache;
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225 _icache++;
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226
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227 /*
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228 * Traverse each section from the input file.
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229 */
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230 for (ndx = 1, scn = 0;
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231 _icache->c_scn = elf_nextscn(ielf, scn);
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232 ndx++, scn = _icache->c_scn, _icache++) {
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233
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234 if ((_icache->c_shdr = shdr = elf_getshdr(_icache->c_scn)) == NULL)
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235 return (elferr("elf_getshdr"));
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236
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237 if ((_icache->c_data = elf_getdata(_icache->c_scn, NULL)) == NULL)
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238 return (elferr("elf_getdata"));
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239
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240 _icache->c_name = istrs + (size_t)(shdr->sh_name);
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241
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242 /*
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243 * For each section that has a virtual address reestablish the
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244 * data buffer to point to the memory image.
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245 *
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246 * if (shdr->sh_addr)
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247 * _icache->c_data->d_buf = (void *)shdr->sh_addr;
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248 */
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249
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250 /*
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251 * Remember the last section of the data segment, the new .heap
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252 * section will be added after this section.
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253 * If we already have one, then set data_cache to the previous
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254 * section and set heap_cache to this one.
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255 */
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256 if ((shdr->sh_addr + shdr->sh_size)
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257 == (data_phdr->p_vaddr + data_phdr->p_memsz)) {
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258 if (strcmp(_icache->c_name, heap) == 0) {
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259 #ifdef DEBUG
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260 printf("Found a previous .heap section\n");
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261 #endif
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262 data_cache = _icache - 1;
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263 heap_cache = _icache;
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264 heap_sz = shdr->sh_size;
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265 } else {
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266 data_cache = _icache;
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267 }
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268 }
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269
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270 /*
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271 * Remember the section header string table as this will be
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272 * rewritten with the new .heap name.
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273 */
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274 if ((shdr->sh_type == SHT_STRTAB) &&
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275 ((strcmp(_icache->c_name, ".shstrtab")) == 0))
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276 shstr_cache = _icache;
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277 }
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278 if (data_cache == 0) {
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279 fprintf(stderr, "final data section not found!\n");
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280 return (0);
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281 }
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282
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283 /*
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284 * Determine the new .heap section to create.
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285 */
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286 rundata.d_buf = (void *)(data_cache->c_shdr->sh_addr +
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287 data_cache->c_shdr->sh_size);
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288 rundata.d_size = (int)sbrk(0) - (int)rundata.d_buf;
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289 rundata.d_type = ELF_T_BYTE;
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290 rundata.d_off = 0;
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291 rundata.d_align = 1;
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292 rundata.d_version = EV_CURRENT;
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293
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294 /*
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295 * From the new data buffer determine the new value for _end and _edata.
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296 * This will also be used to update the data segment program header.
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297 *
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298 * If we had a .heap section, then its size is part of the program
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299 * headers notion of data size. Because we're only going to output one
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300 * heap section (ignoring the one in the running binary) we need to
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301 * subract the size of that which we're ignoring.
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302 */
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303 if (heap_cache) {
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304 edata = S_ROUND((data_phdr->p_vaddr
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305 + data_phdr->p_memsz
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306 - heap_sz), rundata.d_align) + rundata.d_size;
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307 } else {
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308 edata = S_ROUND((data_phdr->p_vaddr + data_phdr->p_memsz),
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309 rundata.d_align) + rundata.d_size;
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310 }
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311
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312 /*
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313 * We're now ready to construct the new elf image.
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314 *
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315 * Obtain a new elf header and initialize it with any basic information
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316 * that isn't calculated as part of elf_update(). Bump the section
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317 * header string table index to account for the .heap section we'll be
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318 * adding.
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319 */
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320 if ((oehdr = elf_newehdr(oelf)) == NULL)
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321 return (elferr("elf_newehdr"));
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322
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323 oehdr->e_entry = iehdr->e_entry;
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324 oehdr->e_machine = iehdr->e_machine;
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325 oehdr->e_type = iehdr->e_type;
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326 oehdr->e_flags = iehdr->e_flags;
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327 /*
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328 * If we already have a heap section, we don't need any adjustment
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329 */
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330 if (heap_cache)
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331 oehdr->e_shstrndx = iehdr->e_shstrndx;
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332 else
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333 oehdr->e_shstrndx = iehdr->e_shstrndx + 1;
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334
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335 #ifdef DEBUG
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336 printf("iehdr->e_flags = %x\n", iehdr->e_flags);
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337 printf("iehdr->e_entry = %x\n", iehdr->e_entry);
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338 printf("iehdr->e_shstrndx= %d\n", iehdr->e_shstrndx);
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339 printf("iehdr->e_machine = %d\n", iehdr->e_machine);
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340 printf("iehdr->e_type = 0x%x\n", iehdr->e_type);
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341 printf("oehdr->e_machine = %d\n", oehdr->e_machine);
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342 printf("oehdr->e_type = 0x%x\n", oehdr->e_type);
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343 #endif
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344
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345 /*
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346 * Obtain a new set of program headers. Initialize these with the same
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347 * information as the input program headers and update the data segment
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348 * to reflect the new .heap section.
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349 */
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350 if ((ophdr = elf_newphdr(oelf, iehdr->e_phnum)) == NULL)
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351 return (elferr("elf_newphdr"));
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352
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353 for (ndx = 0; ndx != iehdr->e_phnum; ndx++, iphdr++, ophdr++) {
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354 *ophdr = *iphdr;
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355 if (data_phdr == iphdr)
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356 ophdr->p_filesz = ophdr->p_memsz = edata - ophdr->p_vaddr;
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357 }
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358
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359 /*
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360 * Obtain a new set of sections.
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361 */
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362 _icache = icache;
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363 _icache++;
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364 for (ndx = 1; ndx != iehdr->e_shnum; ndx++, _icache++) {
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365 /*
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366 * Skip the heap section of the running executable
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367 */
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368 if (_icache == heap_cache)
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369 continue;
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370 /*
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371 * Create a matching section header in the output file.
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372 */
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373 if ((scn = elf_newscn(oelf)) == NULL)
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374 return (elferr("elf_newscn"));
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375 if ((shdr = elf_getshdr(scn)) == NULL)
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376 return (elferr("elf_getshdr"));
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377 *shdr = *_icache->c_shdr;
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378
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379 /*
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380 * Create a matching data buffer for this section.
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381 */
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382 if ((data = elf_newdata(scn)) == NULL)
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383 return (elferr("elf_newdata"));
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384 *data = *_icache->c_data;
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385
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386 /*
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387 * For each section that has a virtual address reestablish the
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388 * data buffer to point to the memory image. Note, we skip
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389 * the plt section.
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390 */
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391 if ((shdr->sh_addr) && (!((shdr->sh_type == SHT_PROGBITS)
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392 && (strcmp(_icache->c_name, ".plt") == 0))))
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393 data->d_buf = (void *)shdr->sh_addr;
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394
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395 /*
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396 * Update any NOBITS section to indicate that it now contains
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397 * data.
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398 */
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|
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399 if (shdr->sh_type == SHT_NOBITS)
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400 shdr->sh_type = SHT_PROGBITS;
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401
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402 /*
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403 * Add the new .heap section after the last section of the
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404 * present data segment. If we had a heap section, then
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405 * this is the section preceding it.
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406 */
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407 if (data_cache == _icache) {
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408 if ((scn = elf_newscn(oelf)) == NULL)
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409 return (elferr("elf_newscn"));
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410 if ((shdr = elf_getshdr(scn)) == NULL)
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411 return (elferr("elf_getshdr"));
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412 shdr->sh_type = SHT_PROGBITS;
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413 shdr->sh_flags = SHF_ALLOC | SHF_WRITE;
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414
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|
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415 if ((data = elf_newdata(scn)) == NULL)
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416 return (elferr("elf_newdata"));
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417 *data = rundata;
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418 }
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|
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419
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420 /*
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|
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421 * Update the section header string table size to reflect the
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|
|
422 * new section name (only if we didn't already have a heap).
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|
|
423 */
|
|
|
424 if (!heap_cache) {
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|
|
425 if (shstr_cache && (shstr_cache == _icache)) {
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|
|
426 data->d_size += sizeof (heap);
|
|
|
427 }
|
|
|
428 }
|
|
|
429 }
|
|
|
430
|
|
|
431 /*
|
|
|
432 * Write out the new image, and obtain a new elf descriptor that will
|
|
|
433 * allow us to write to the new image.
|
|
|
434 */
|
|
|
435 if (elf_update(oelf, ELF_C_WRITE) == -1)
|
|
|
436 return (elferr("elf_update"));
|
|
|
437 elf_end(oelf);
|
|
|
438 if ((oelf = elf_begin(fd, ELF_C_RDWR, NULL)) == NULL)
|
|
|
439 return (elferr("elf_begin"));
|
|
|
440 if ((oehdr = elf_getehdr(oelf)) == NULL)
|
|
|
441 return (elferr("elf_getehdr"));
|
|
|
442
|
|
|
443 /*
|
|
|
444 * Obtain the output files section header string table.
|
|
|
445 */
|
|
|
446 if ((scn = elf_getscn(oelf, oehdr->e_shstrndx)) == NULL)
|
|
|
447 return (elferr("elf_getscn"));
|
|
|
448 if ((data = elf_getdata(scn, NULL)) == NULL)
|
|
|
449 return (elferr("elf_getdata"));
|
|
|
450 ostrs = _ostrs = data->d_buf;
|
|
|
451 *_ostrs++ = '\0';
|
|
|
452
|
|
|
453 /*
|
|
|
454 * Construct a cache to maintain the output files section information.
|
|
|
455 */
|
|
|
456 if ((ocache = (Cache *)malloc(oehdr->e_shnum * sizeof (Cache))) == 0) {
|
|
|
457 fprintf(stderr, "malloc failed: %s\n", strerror(errno));
|
|
|
458 return (1);
|
|
|
459 }
|
|
|
460 _ocache = ocache;
|
|
|
461 _ocache++;
|
|
|
462 _icache = icache;
|
|
|
463 _icache++;
|
|
|
464
|
|
|
465 /*
|
|
|
466 * Traverse each section from the input file rebuilding the section
|
|
|
467 * header string table as we go.
|
|
|
468 */
|
|
|
469 _ndx = _addr = 0;
|
|
|
470 for (ndx = 1, scn = 0;
|
|
|
471 _ocache->c_scn = elf_nextscn(oelf, scn);
|
|
|
472 ndx++, scn = _ocache->c_scn, _ocache++, _icache++) {
|
|
|
473
|
|
|
474 const char *strs;
|
|
|
475
|
|
|
476 if (_icache == heap_cache) {
|
|
|
477 #ifdef DEBUG
|
|
|
478 printf("ignoring .heap section in input\n");
|
|
|
479 #endif
|
|
|
480 _icache++;
|
|
|
481 }
|
|
|
482
|
|
|
483 if ((_ocache->c_shdr = shdr =
|
|
|
484 elf_getshdr(_ocache->c_scn)) == NULL)
|
|
|
485 return (elferr("elf_getshdr"));
|
|
|
486 if ((_ocache->c_data =
|
|
|
487 elf_getdata(_ocache->c_scn, NULL)) == NULL)
|
|
|
488 return (elferr("elf_getdata"));
|
|
|
489
|
|
|
490 /*
|
|
|
491 * If were inserting the new .heap section, insert the new
|
|
|
492 * section name and initialize it's virtual address.
|
|
|
493 */
|
|
|
494 if (_addr) {
|
|
|
495 strs = heap;
|
|
|
496 shdr->sh_addr = S_ROUND(_addr, shdr->sh_addralign);
|
|
|
497 _addr = 0;
|
|
|
498 } else {
|
|
|
499 strs = istrs + (size_t)(_icache->c_shdr->sh_name);
|
|
|
500 }
|
|
|
501
|
|
|
502 strcpy(_ostrs, strs);
|
|
|
503 shdr->sh_name = _ostrs - ostrs;
|
|
|
504 _ocache->c_name = _ostrs;
|
|
|
505 _ostrs += strlen(strs) + 1;
|
|
|
506
|
|
|
507 /*
|
|
|
508 * If we've inserted a new section any later section may need
|
|
|
509 * their sh_link fields updated.
|
|
|
510 * If we already had a heap section, then this is not required.
|
|
|
511 */
|
|
|
512 if (!heap_cache) {
|
|
|
513 if (_ndx) {
|
|
|
514 if (_ocache->c_shdr->sh_link >= _ndx)
|
|
|
515 _ocache->c_shdr->sh_link++;
|
|
|
516 }
|
|
|
517 }
|
|
|
518
|
|
|
519 /*
|
|
|
520 * If this is the last section of the original data segment
|
|
|
521 * determine sufficient information to initialize the new .heap
|
|
|
522 * section which will be obtained next.
|
|
|
523 */
|
|
|
524 if (data_cache == _icache) {
|
|
|
525 _ndx = ndx + 1;
|
|
|
526 _addr = shdr->sh_addr + shdr->sh_size;
|
|
|
527 _icache--;
|
|
|
528 data_cache = 0;
|
|
|
529 }
|
|
|
530 }
|
|
|
531
|
|
|
532 /*
|
|
|
533 * Now that we have a complete description of the new image update any
|
|
|
534 * sections that are required.
|
|
|
535 *
|
|
|
536 * o update the value of _edata and _end.
|
|
|
537 *
|
|
|
538 * o reset any relocation entries if necessary.
|
|
|
539 */
|
|
|
540 _ocache = &ocache[1];
|
|
|
541 _icache = &icache[1];
|
|
|
542 for (ndx = 1; ndx < oehdr->e_shnum; ndx++, _ocache++, _icache++) {
|
|
|
543 if ((_ocache->c_shdr->sh_type == SHT_SYMTAB) ||
|
|
|
544 (_ocache->c_shdr->sh_type == SHT_DYNSYM))
|
|
|
545 update_sym(ocache, _ocache, edata);
|
|
|
546
|
|
|
547 if (_ocache->c_shdr->sh_type == M_REL_SHT_TYPE)
|
|
|
548 update_reloc(ocache, _ocache, icache, _icache, oehdr->e_shnum);
|
|
|
549 }
|
|
|
550
|
|
|
551 if (elf_update(oelf, ELF_C_WRITE) == -1)
|
|
|
552 return (elferr("elf_update"));
|
|
|
553
|
|
|
554 elf_end(oelf);
|
|
|
555 elf_end(ielf);
|
|
|
556 return (0);
|
|
|
557 }
|
