mdsetimage.c revision 1.7
1 /* $NetBSD: mdsetimage.c,v 1.7 1998/08/27 18:03:44 ross Exp $ */ 2 3 /* 4 * Copyright (c) 1996 Christopher G. Demetriou. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Christopher G. Demetriou 17 * for the NetBSD Project. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 #ifndef lint 35 __COPYRIGHT( 36 "@(#) Copyright (c) 1996 Christopher G. Demetriou.\ 37 All rights reserved.\n"); 38 #endif /* not lint */ 39 40 #ifndef lint 41 __RCSID("$NetBSD: mdsetimage.c,v 1.7 1998/08/27 18:03:44 ross Exp $"); 42 #endif /* not lint */ 43 44 #include <sys/types.h> 45 #include <sys/mman.h> 46 #include <sys/stat.h> 47 48 #include <err.h> 49 #include <fcntl.h> 50 #include <limits.h> 51 #include <nlist.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <unistd.h> 55 56 #include "extern.h" 57 58 int main __P((int, char *[])); 59 static void usage __P((void)) __attribute__((noreturn)); 60 static int find_md_root __P((const char *, const char *, size_t, 61 const struct nlist *, size_t *, u_int32_t *)); 62 63 static struct nlist md_root_nlist[] = { 64 #define X_MD_ROOT_IMAGE 0 65 { "_md_root_image" }, 66 #define X_MD_ROOT_SIZE 1 67 { "_md_root_size" }, 68 { NULL } 69 }; 70 71 int verbose; 72 #ifdef NLIST_AOUT 73 /* 74 * Since we can't get the text address from an a.out executable, we 75 * need to be able to specify it. Note: there's no way to test to 76 * see if the user entered a valid address! 77 */ 78 int T_flag_specified; /* the -T flag was specified */ 79 u_long text_start; /* Start of kernel text */ 80 #endif /* NLIST_AOUT */ 81 82 int 83 main(argc, argv) 84 int argc; 85 char *argv[]; 86 { 87 struct stat ksb, fssb; 88 size_t md_root_offset; 89 u_int32_t md_root_size; 90 const char *kfile, *fsfile; 91 char *mappedkfile; 92 int ch, kfd, fsfd, rv; 93 94 while ((ch = getopt(argc, argv, "T:v")) != -1) 95 switch (ch) { 96 case 'v': 97 verbose = 1; 98 break; 99 case 'T': 100 #ifdef NLIST_AOUT 101 T_flag_specified = 1; 102 text_start = strtoul(optarg, NULL, 0); 103 break; 104 #endif /* NLIST_AOUT */ 105 /* FALLTHROUGH */ 106 case '?': 107 default: 108 usage(); 109 } 110 argc -= optind; 111 argv += optind; 112 113 if (argc != 2) 114 usage(); 115 kfile = argv[0]; 116 fsfile = argv[1]; 117 118 if ((kfd = open(kfile, O_RDWR, 0)) == -1) 119 err(1, "open %s", kfile); 120 121 if ((rv = __fdnlist(kfd, md_root_nlist)) != 0) 122 errx(1, "could not find symbols in %s", kfile); 123 if (verbose) 124 fprintf(stderr, "got symbols from %s\n", kfile); 125 126 if (fstat(kfd, &ksb) == -1) 127 err(1, "fstat %s", kfile); 128 if (ksb.st_size > SIZE_T_MAX) 129 errx(1, "%s too big to map", kfile); 130 131 if ((mappedkfile = mmap(NULL, ksb.st_size, PROT_READ | PROT_WRITE, 132 MAP_FILE | MAP_SHARED, kfd, 0)) == (caddr_t)-1) 133 err(1, "mmap %s", kfile); 134 if (verbose) 135 fprintf(stderr, "mapped %s\n", kfile); 136 137 if (find_md_root(kfile, mappedkfile, ksb.st_size, md_root_nlist, 138 &md_root_offset, &md_root_size) != 0) 139 errx(1, "could not find md root buffer in %s", kfile); 140 141 if ((fsfd = open(fsfile, O_RDONLY, 0)) == -1) 142 err(1, "open %s", fsfile); 143 if (fstat(fsfd, &fssb) == -1) 144 err(1, "fstat %s", fsfile); 145 if (fssb.st_size > SIZE_T_MAX) 146 errx(1, "fs image is too big"); 147 if (fssb.st_size > md_root_size) 148 errx(1, "fs image (%qd bytes) too big for buffer (%ld bytes)", 149 (long long)fssb.st_size, (unsigned long)md_root_size); 150 151 if (verbose) 152 fprintf(stderr, "copying image from %s into %s\n", fsfile, 153 kfile); 154 if ((rv = read(fsfd, mappedkfile + md_root_offset, 155 fssb.st_size)) != fssb.st_size) { 156 if (rv == -1) 157 err(1, "read %s", fsfile); 158 else 159 errx(1, "unexpected EOF reading %s", fsfile); 160 } 161 if (verbose) 162 fprintf(stderr, "done copying image\n"); 163 164 close(fsfd); 165 166 munmap(mappedkfile, ksb.st_size); 167 close(kfd); 168 169 if (verbose) 170 fprintf(stderr, "exiting\n"); 171 exit(0); 172 } 173 174 static void 175 usage() 176 { 177 extern const char *__progname; 178 179 fprintf(stderr, "usage: %s kernel_file fsimage_file\n", __progname); 180 exit(1); 181 } 182 183 184 struct { 185 const char *name; 186 int (*check) __P((const char *, size_t)); 187 int (*findoff) __P((const char *, size_t, u_long, size_t *)); 188 } exec_formats[] = { 189 #ifdef NLIST_AOUT 190 { "a.out", check_aout, findoff_aout, }, 191 #endif 192 #ifdef NLIST_ECOFF 193 { "ECOFF", check_ecoff, findoff_ecoff, }, 194 #endif 195 #ifdef NLIST_ELF32 196 { "ELF32", check_elf32, findoff_elf32, }, 197 #endif 198 #ifdef NLIST_ELF64 199 { "ELF64", check_elf64, findoff_elf64, }, 200 #endif 201 }; 202 203 static int 204 find_md_root(fname, mappedfile, mappedsize, nl, rootoffp, rootsizep) 205 const char *fname, *mappedfile; 206 size_t mappedsize; 207 const struct nlist *nl; 208 size_t *rootoffp; 209 u_int32_t *rootsizep; 210 { 211 int i, n; 212 size_t rootsizeoff; 213 214 n = sizeof exec_formats / sizeof exec_formats[0]; 215 for (i = 0; i < n; i++) { 216 if ((*exec_formats[i].check)(mappedfile, mappedsize) == 0) 217 break; 218 } 219 if (i == n) { 220 warnx("%s: unknown executable format", fname); 221 return (1); 222 } 223 224 if (verbose) { 225 fprintf(stderr, "%s is an %s binary\n", fname, 226 exec_formats[i].name); 227 #ifdef NLIST_AOUT 228 if (T_flag_specified) 229 fprintf(stderr, "kernel text loads at 0x%lx\n", 230 text_start); 231 #endif 232 } 233 234 if ((*exec_formats[i].findoff)(mappedfile, mappedsize, 235 nl[X_MD_ROOT_SIZE].n_value, &rootsizeoff) != 0) { 236 warnx("couldn't find offset for %s in %s", 237 nl[X_MD_ROOT_SIZE].n_name, fname); 238 return (1); 239 } 240 if (verbose) 241 fprintf(stderr, "%s is at offset %#lx in %s\n", 242 nl[X_MD_ROOT_SIZE].n_name, 243 (unsigned long)rootsizeoff, fname); 244 *rootsizep = *(u_int32_t *)&mappedfile[rootsizeoff]; 245 if (verbose) 246 fprintf(stderr, "%s has value %#x\n", 247 nl[X_MD_ROOT_SIZE].n_name, *rootsizep); 248 249 if ((*exec_formats[i].findoff)(mappedfile, mappedsize, 250 nl[X_MD_ROOT_IMAGE].n_value, rootoffp) != 0) { 251 warnx("couldn't find offset for %s in %s", 252 nl[X_MD_ROOT_IMAGE].n_name, fname); 253 return (1); 254 } 255 if (verbose) 256 fprintf(stderr, "%s is at offset %#lx in %s\n", 257 nl[X_MD_ROOT_IMAGE].n_name, 258 (unsigned long)(*rootoffp), fname); 259 260 return (0); 261 } 262
Indexes created Fri Sep 26 08:10:20 GMT 2025