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428
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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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442
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71 * modification that occurred during the applications execution.
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428
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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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468
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76 #pragma ident "@(#) $Id: dynodump.c,v 1.9 2001/04/13 09:11:20 michaels Exp $ - SMI"
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428
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77
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78 #define __EXTENSIONS__ 1
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79
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80 #include <sys/param.h>
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81 #include <sys/procfs.h>
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82 #include <fcntl.h>
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83 #include <stdio.h>
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84 #include <libelf.h>
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85 #include <link.h>
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86 #include <stdlib.h>
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87 #include <string.h>
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88 #include <unistd.h>
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89 #include <errno.h>
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90 #include <malloc.h>
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91 #include "machdep.h"
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92 #include "_dynodump.h"
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93
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94 /*
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95 * Generic elf error message generator
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96 */
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97 static int
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98 elferr(const char * str)
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99 {
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100 fprintf(stderr, "%s: %s\n", str, elf_errmsg(elf_errno()));
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101 return (1);
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102 }
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103
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104 int dynodump (const char * file);
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105 int
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106 dynodump(const char * file)
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107 {
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108 Elf *ielf, *oelf;
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109 Ehdr *iehdr, *oehdr;
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110 Phdr *iphdr, *ophdr, *data_phdr = 0;
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111 Cache *icache, *ocache, *_icache, *_ocache;
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112 Cache *data_cache = 0, *shstr_cache = 0;
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113 Cache *heap_cache = 0;
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114 Word heap_sz = 0;
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115 Elf_Scn *scn;
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116 Shdr *shdr;
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117 Elf_Data *data, rundata;
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118 Half ndx, _ndx;
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119 int fd, _fd;
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120 Addr edata, _addr;
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121 char *istrs, *ostrs, *_ostrs, proc[16];
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122 const char heap[] = ".heap";
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123 prstatus_t pstat;
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124
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125 /* make a call to the processor specific un-init stuff */
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126 dynodump_uninit();
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127
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128 /*
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129 * Obtain a file descriptor for this process,
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130 * for the executable and get a prstatus_t
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131 * structure.
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132 */
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133 sprintf(proc, "/proc/%ld", getpid());
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134 if (((_fd = open(proc, O_RDONLY, 0)) == -1) ||
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135 ((fd = ioctl(_fd, PIOCOPENM, (void *)0)) == -1) ||
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136 (ioctl(_fd, PIOCSTATUS, &pstat) == -1)) {
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137 fprintf(stderr, "/proc: initialization error: %s\n",
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138 strerror(errno));
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139 close(_fd);
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140 return (1);
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141 }
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142 close(_fd);
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143
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144 /*
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145 * Initialize with the ELF library and make sure this is an executable
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146 * ELF file we're dealing with.
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147 */
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148 elf_version(EV_CURRENT);
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149 if ((ielf = elf_begin(fd, ELF_C_READ, NULL)) == NULL) {
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150 close(fd);
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151 return (elferr("elf_begin"));
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152 }
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153 close(fd);
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154
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155 if ((elf_kind(ielf) != ELF_K_ELF) ||
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156 ((iehdr = elf_getehdr(ielf)) == NULL) ||
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157 (iehdr->e_type != ET_EXEC)) {
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158 fprintf(stderr, "image is not an ELF executable\n");
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159 elf_end(ielf);
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160 return (1);
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161 }
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162 /*
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163 * Elf_elf_header(iehdr);
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164 */
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165
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166 /*
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167 * Create the new output file.
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168 */
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169 if ((fd = open(file, O_RDWR | O_CREAT | O_TRUNC, 0777)) == -1) {
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170 fprintf(stderr, "%s: open failed: %s\n", file,
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171 strerror(errno));
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172 elf_end(ielf);
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173 return (1);
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174 }
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175 if ((oelf = elf_begin(fd, ELF_C_WRITE, NULL)) == NULL) {
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176 elf_end(ielf);
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177 close(fd);
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178 return (elferr("elf_begin"));
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179 }
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180
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181 /*
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182 * Obtain the input program headers. Remember the data segments
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183 * program header entry as this will be updated later to reflect the
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184 * new .heap sections size.
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185 */
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186 if ((iphdr = elf_getphdr(ielf)) == NULL)
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187 return (elferr("elf_getphdr"));
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188
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189 for (ndx = 0, ophdr = iphdr; ndx != iehdr->e_phnum; ndx++, ophdr++) {
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190 /*
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191 * Save the program header that contains the NOBITS section, or
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192 * the last loadable program header if no NOBITS exists.
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193 * A NOBITS section translates to a memory size requirement that
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194 * is greater than the file data it is mapped from.
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195 */
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196 if (ophdr->p_type == PT_LOAD) {
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197 if (ophdr->p_filesz != ophdr->p_memsz)
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198 data_phdr = ophdr;
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199 else if (data_phdr) {
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200 if (data_phdr->p_vaddr < ophdr->p_vaddr)
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201 data_phdr = ophdr;
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202 } else
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203 data_phdr = ophdr;
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204 }
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205 }
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206 if (data_phdr == 0) {
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207 fprintf(stderr, "no data segment found!\n");
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208 return (0);
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209 }
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210
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211 /*
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212 * Obtain the input files section header string table.
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213 */
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214 if ((scn = elf_getscn(ielf, iehdr->e_shstrndx)) == NULL)
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215 return (elferr("elf_getscn"));
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216 if ((data = elf_getdata(scn, NULL)) == NULL)
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217 return (elferr("elf_getdata"));
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218 istrs = (char *) data->d_buf;
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219
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220 /*
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221 * Construct a cache to maintain the input files section information.
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222 */
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223 if ((icache = (Cache *) malloc(iehdr->e_shnum * sizeof (Cache))) == 0) {
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224 fprintf(stderr, "malloc failed: %s\n", strerror(errno));
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225 return (1);
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226 }
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227 _icache = icache;
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228 _icache++;
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229
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230 /*
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231 * Traverse each section from the input file.
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232 */
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233 for (ndx = 1, scn = 0;
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234 (_icache->c_scn = elf_nextscn(ielf, scn));
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235 ndx++, scn = _icache->c_scn, _icache++) {
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236
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237 if ((_icache->c_shdr = shdr = elf_getshdr(_icache->c_scn)) == NULL)
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238 return (elferr("elf_getshdr"));
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239
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240 if ((_icache->c_data = elf_getdata(_icache->c_scn, NULL)) == NULL)
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241 return (elferr("elf_getdata"));
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242
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243 _icache->c_name = istrs + (size_t)(shdr->sh_name);
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244
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245 /*
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246 * For each section that has a virtual address reestablish the
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247 * data buffer to point to the memory image.
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248 *
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249 * if (shdr->sh_addr)
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250 * _icache->c_data->d_buf = (void *)shdr->sh_addr;
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251 */
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252
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253 /*
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254 * Remember the last section of the data segment, the new .heap
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255 * section will be added after this section.
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256 * If we already have one, then set data_cache to the previous
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257 * section and set heap_cache to this one.
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258 */
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259 if ((shdr->sh_addr + shdr->sh_size)
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260 == (data_phdr->p_vaddr + data_phdr->p_memsz)) {
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261 if (strcmp(_icache->c_name, heap) == 0) {
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262 #ifdef DEBUG
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263 printf("Found a previous .heap section\n");
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264 #endif
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265 data_cache = _icache - 1;
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266 heap_cache = _icache;
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267 heap_sz = shdr->sh_size;
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268 } else {
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269 data_cache = _icache;
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270 }
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271 }
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272
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273 /*
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274 * Remember the section header string table as this will be
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275 * rewritten with the new .heap name.
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276 */
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277 if ((shdr->sh_type == SHT_STRTAB) &&
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278 ((strcmp(_icache->c_name, ".shstrtab")) == 0))
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279 shstr_cache = _icache;
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280 }
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281 if (data_cache == 0) {
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282 fprintf(stderr, "final data section not found!\n");
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283 return (0);
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284 }
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285
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286 /*
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287 * Determine the new .heap section to create.
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288 */
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289 rundata.d_buf = (void *)(data_cache->c_shdr->sh_addr +
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290 data_cache->c_shdr->sh_size);
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291 rundata.d_size = (int)sbrk(0) - (int)rundata.d_buf;
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292 rundata.d_type = ELF_T_BYTE;
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293 rundata.d_off = 0;
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294 rundata.d_align = 1;
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295 rundata.d_version = EV_CURRENT;
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296
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297 /*
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298 * From the new data buffer determine the new value for _end and _edata.
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299 * This will also be used to update the data segment program header.
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300 *
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301 * If we had a .heap section, then its size is part of the program
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302 * headers notion of data size. Because we're only going to output one
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303 * heap section (ignoring the one in the running binary) we need to
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442
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304 * subtract the size of that which we're ignoring.
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428
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305 */
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306 if (heap_cache) {
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307 edata = S_ROUND((data_phdr->p_vaddr
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308 + data_phdr->p_memsz
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309 - heap_sz), rundata.d_align) + rundata.d_size;
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310 } else {
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311 edata = S_ROUND((data_phdr->p_vaddr + data_phdr->p_memsz),
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312 rundata.d_align) + rundata.d_size;
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313 }
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314
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315 /*
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316 * We're now ready to construct the new elf image.
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317 *
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318 * Obtain a new elf header and initialize it with any basic information
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319 * that isn't calculated as part of elf_update(). Bump the section
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320 * header string table index to account for the .heap section we'll be
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321 * adding.
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322 */
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323 if ((oehdr = elf_newehdr(oelf)) == NULL)
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324 return (elferr("elf_newehdr"));
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325
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326 oehdr->e_entry = iehdr->e_entry;
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327 oehdr->e_machine = iehdr->e_machine;
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328 oehdr->e_type = iehdr->e_type;
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329 oehdr->e_flags = iehdr->e_flags;
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330 /*
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331 * If we already have a heap section, we don't need any adjustment
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332 */
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333 if (heap_cache)
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334 oehdr->e_shstrndx = iehdr->e_shstrndx;
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335 else
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336 oehdr->e_shstrndx = iehdr->e_shstrndx + 1;
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337
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338 #ifdef DEBUG
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339 printf("iehdr->e_flags = %x\n", iehdr->e_flags);
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340 printf("iehdr->e_entry = %x\n", iehdr->e_entry);
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341 printf("iehdr->e_shstrndx= %d\n", iehdr->e_shstrndx);
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342 printf("iehdr->e_machine = %d\n", iehdr->e_machine);
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343 printf("iehdr->e_type = 0x%x\n", iehdr->e_type);
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344 printf("oehdr->e_machine = %d\n", oehdr->e_machine);
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345 printf("oehdr->e_type = 0x%x\n", oehdr->e_type);
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346 #endif
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347
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348 /*
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349 * Obtain a new set of program headers. Initialize these with the same
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350 * information as the input program headers and update the data segment
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351 * to reflect the new .heap section.
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352 */
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353 if ((ophdr = elf_newphdr(oelf, iehdr->e_phnum)) == NULL)
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354 return (elferr("elf_newphdr"));
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355
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356 for (ndx = 0; ndx != iehdr->e_phnum; ndx++, iphdr++, ophdr++) {
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357 *ophdr = *iphdr;
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358 if (data_phdr == iphdr)
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359 ophdr->p_filesz = ophdr->p_memsz = edata - ophdr->p_vaddr;
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360 }
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361
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362 /*
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363 * Obtain a new set of sections.
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364 */
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365 _icache = icache;
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366 _icache++;
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367 for (ndx = 1; ndx != iehdr->e_shnum; ndx++, _icache++) {
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368 /*
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369 * Skip the heap section of the running executable
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370 */
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371 if (_icache == heap_cache)
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372 continue;
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373 /*
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374 * Create a matching section header in the output file.
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375 */
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376 if ((scn = elf_newscn(oelf)) == NULL)
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377 return (elferr("elf_newscn"));
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378 if ((shdr = elf_getshdr(scn)) == NULL)
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379 return (elferr("elf_getshdr"));
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380 *shdr = *_icache->c_shdr;
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381
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382 /*
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383 * Create a matching data buffer for this section.
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384 */
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385 if ((data = elf_newdata(scn)) == NULL)
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386 return (elferr("elf_newdata"));
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387 *data = *_icache->c_data;
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388
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389 /*
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390 * For each section that has a virtual address reestablish the
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391 * data buffer to point to the memory image. Note, we skip
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392 * the plt section.
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393 */
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394 if ((shdr->sh_addr) && (!((shdr->sh_type == SHT_PROGBITS)
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395 && (strcmp(_icache->c_name, ".plt") == 0))))
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396 data->d_buf = (void *)shdr->sh_addr;
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397
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398 /*
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399 * Update any NOBITS section to indicate that it now contains
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400 * data.
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401 */
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402 if (shdr->sh_type == SHT_NOBITS)
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403 shdr->sh_type = SHT_PROGBITS;
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404
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405 /*
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406 * Add the new .heap section after the last section of the
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407 * present data segment. If we had a heap section, then
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408 * this is the section preceding it.
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409 */
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410 if (data_cache == _icache) {
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411 if ((scn = elf_newscn(oelf)) == NULL)
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412 return (elferr("elf_newscn"));
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413 if ((shdr = elf_getshdr(scn)) == NULL)
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414 return (elferr("elf_getshdr"));
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415 shdr->sh_type = SHT_PROGBITS;
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416 shdr->sh_flags = SHF_ALLOC | SHF_WRITE;
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417
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|
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418 if ((data = elf_newdata(scn)) == NULL)
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419 return (elferr("elf_newdata"));
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420 *data = rundata;
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421 }
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|
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422
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|
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423 /*
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|
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424 * Update the section header string table size to reflect the
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|
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425 * new section name (only if we didn't already have a heap).
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|
|
426 */
|
|
|
427 if (!heap_cache) {
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|
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428 if (shstr_cache && (shstr_cache == _icache)) {
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|
|
429 data->d_size += sizeof (heap);
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|
|
430 }
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|
|
431 }
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|
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432 }
|
|
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433
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|
|
434 /*
|
|
|
435 * Write out the new image, and obtain a new elf descriptor that will
|
|
|
436 * allow us to write to the new image.
|
|
|
437 */
|
|
|
438 if (elf_update(oelf, ELF_C_WRITE) == -1)
|
|
|
439 return (elferr("elf_update"));
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|
|
440 elf_end(oelf);
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|
|
441 if ((oelf = elf_begin(fd, ELF_C_RDWR, NULL)) == NULL)
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|
|
442 return (elferr("elf_begin"));
|
|
|
443 if ((oehdr = elf_getehdr(oelf)) == NULL)
|
|
|
444 return (elferr("elf_getehdr"));
|
|
|
445
|
|
|
446 /*
|
|
|
447 * Obtain the output files section header string table.
|
|
|
448 */
|
|
|
449 if ((scn = elf_getscn(oelf, oehdr->e_shstrndx)) == NULL)
|
|
|
450 return (elferr("elf_getscn"));
|
|
|
451 if ((data = elf_getdata(scn, NULL)) == NULL)
|
|
|
452 return (elferr("elf_getdata"));
|
|
|
453 ostrs = _ostrs = (char *) data->d_buf;
|
|
|
454 *_ostrs++ = '\0';
|
|
|
455
|
|
|
456 /*
|
|
|
457 * Construct a cache to maintain the output files section information.
|
|
|
458 */
|
|
|
459 if ((ocache = (Cache *)malloc(oehdr->e_shnum * sizeof (Cache))) == 0) {
|
|
|
460 fprintf(stderr, "malloc failed: %s\n", strerror(errno));
|
|
|
461 return (1);
|
|
|
462 }
|
|
|
463 _ocache = ocache;
|
|
|
464 _ocache++;
|
|
|
465 _icache = icache;
|
|
|
466 _icache++;
|
|
|
467
|
|
|
468 /*
|
|
|
469 * Traverse each section from the input file rebuilding the section
|
|
|
470 * header string table as we go.
|
|
|
471 */
|
|
|
472 _ndx = _addr = 0;
|
|
|
473 for (ndx = 1, scn = 0;
|
|
|
474 (_ocache->c_scn = elf_nextscn(oelf, scn));
|
|
|
475 ndx++, scn = _ocache->c_scn, _ocache++, _icache++) {
|
|
|
476
|
|
|
477 const char *strs;
|
|
|
478
|
|
|
479 if (_icache == heap_cache) {
|
|
|
480 #ifdef DEBUG
|
|
|
481 printf("ignoring .heap section in input\n");
|
|
|
482 #endif
|
|
|
483 _icache++;
|
|
|
484 }
|
|
|
485
|
|
|
486 if ((_ocache->c_shdr = shdr =
|
|
|
487 elf_getshdr(_ocache->c_scn)) == NULL)
|
|
|
488 return (elferr("elf_getshdr"));
|
|
|
489 if ((_ocache->c_data =
|
|
|
490 elf_getdata(_ocache->c_scn, NULL)) == NULL)
|
|
|
491 return (elferr("elf_getdata"));
|
|
|
492
|
|
|
493 /*
|
|
|
494 * If were inserting the new .heap section, insert the new
|
|
|
495 * section name and initialize its virtual address.
|
|
|
496 */
|
|
|
497 if (_addr) {
|
|
|
498 strs = heap;
|
|
|
499 shdr->sh_addr = S_ROUND(_addr, shdr->sh_addralign);
|
|
|
500 _addr = 0;
|
|
|
501 } else {
|
|
|
502 strs = istrs + (size_t)(_icache->c_shdr->sh_name);
|
|
|
503 }
|
|
|
504
|
|
|
505 strcpy(_ostrs, strs);
|
|
|
506 shdr->sh_name = _ostrs - ostrs;
|
|
|
507 _ocache->c_name = _ostrs;
|
|
|
508 _ostrs += strlen(strs) + 1;
|
|
|
509
|
|
|
510 /*
|
|
|
511 * If we've inserted a new section any later section may need
|
|
|
512 * their sh_link fields updated.
|
|
|
513 * If we already had a heap section, then this is not required.
|
|
|
514 */
|
|
|
515 if (!heap_cache) {
|
|
|
516 if (_ndx) {
|
|
|
517 if (_ocache->c_shdr->sh_link >= _ndx)
|
|
|
518 _ocache->c_shdr->sh_link++;
|
|
|
519 }
|
|
|
520 }
|
|
|
521
|
|
|
522 /*
|
|
|
523 * If this is the last section of the original data segment
|
|
|
524 * determine sufficient information to initialize the new .heap
|
|
|
525 * section which will be obtained next.
|
|
|
526 */
|
|
|
527 if (data_cache == _icache) {
|
|
|
528 _ndx = ndx + 1;
|
|
|
529 _addr = shdr->sh_addr + shdr->sh_size;
|
|
|
530 _icache--;
|
|
|
531 data_cache = 0;
|
|
|
532 }
|
|
|
533 }
|
|
|
534
|
|
|
535 /*
|
|
|
536 * Now that we have a complete description of the new image update any
|
|
|
537 * sections that are required.
|
|
|
538 *
|
|
|
539 * o update the value of _edata and _end.
|
|
|
540 *
|
|
|
541 * o reset any relocation entries if necessary.
|
|
|
542 */
|
|
|
543 _ocache = &ocache[1];
|
|
|
544 _icache = &icache[1];
|
|
|
545 for (ndx = 1; ndx < oehdr->e_shnum; ndx++, _ocache++, _icache++) {
|
|
|
546 if ((_ocache->c_shdr->sh_type == SHT_SYMTAB) ||
|
|
|
547 (_ocache->c_shdr->sh_type == SHT_DYNSYM))
|
|
|
548 update_sym(ocache, _ocache, edata);
|
|
|
549
|
|
|
550 if (_ocache->c_shdr->sh_type == M_REL_SHT_TYPE)
|
|
|
551 update_reloc(ocache, _ocache, icache, _icache, oehdr->e_shnum);
|
|
|
552 }
|
|
|
553
|
|
|
554 if (elf_update(oelf, ELF_C_WRITE) == -1)
|
|
|
555 return (elferr("elf_update"));
|
|
|
556
|
|
|
557 elf_end(oelf);
|
|
|
558 elf_end(ielf);
|
|
|
559 return (0);
|
|
|
560 }
|
