1 /* $NetBSD: nlist_aout.c,v 1.10 2018/01/23 21:06:25 sevan Exp $ */ 2 3 /*- 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /*- 33 * Copyright (c) 1996 Christopher G. Demetriou. All rights reserved. 34 * 35 * Redistribution and use in source and binary forms, with or without 36 * modification, are permitted provided that the following conditions 37 * are met: 38 * 1. Redistributions of source code must retain the above copyright 39 * notice, this list of conditions and the following disclaimer. 40 * 2. Redistributions in binary form must reproduce the above copyright 41 * notice, this list of conditions and the following disclaimer in the 42 * documentation and/or other materials provided with the distribution. 43 * 3. All advertising materials mentioning features or use of this software 44 * must display the following acknowledgement: 45 * This product includes software developed by the University of 46 * California, Berkeley and its contributors. 47 * 4. Neither the name of the University nor the names of its contributors 48 * may be used to endorse or promote products derived from this software 49 * without specific prior written permission. 50 * 51 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 52 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 53 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 54 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 55 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 56 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 57 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 59 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 60 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 61 * SUCH DAMAGE. 62 */ 63 64 #include <sys/cdefs.h> 65 #ifndef lint 66 #if 0 67 static char sccsid[] = "from: @(#)nlist.c 8.1 (Berkeley) 6/6/93"; 68 #else 69 __RCSID("$NetBSD: nlist_aout.c,v 1.10 2018/01/23 21:06:25 sevan Exp $"); 70 #endif 71 #endif /* not lint */ 72 73 #include <sys/param.h> 74 75 #include <a.out.h> 76 #include <db.h> 77 #include <err.h> 78 #include <errno.h> 79 #include <fcntl.h> 80 #include <kvm.h> 81 #include <limits.h> 82 #include <stdio.h> 83 #include <stdlib.h> 84 #include <string.h> 85 #include <unistd.h> 86 87 #include "extern.h" 88 89 #ifdef NLIST_AOUT 90 91 typedef struct nlist NLIST; 92 #define _strx n_un.n_strx 93 #define _name n_un.n_name 94 95 #define badfmt(str) \ 96 do { \ 97 warnx("%s: %s: %s", kfile, str, strerror(EFTYPE)); \ 98 punt(); \ 99 } while (0) 100 101 static void badread(int, char *); 102 static u_long get_kerntext(const char *kfn); 103 104 static const char *kfile; 105 106 int 107 create_knlist_aout(const char *name, DB *db) 108 { 109 int nsyms; 110 struct exec ebuf; 111 FILE *fp; 112 NLIST nbuf; 113 DBT data, key; 114 int fd, nr, strsize; 115 u_long kerntextoff; 116 char *strtab, buf[1024]; 117 118 kfile = name; 119 if ((fd = open(name, O_RDONLY, 0)) < 0) { 120 warn("%s", kfile); 121 punt(); 122 } 123 124 /* Read in exec structure. */ 125 nr = read(fd, &ebuf, sizeof(struct exec)); 126 if (nr != sizeof(struct exec)) { 127 (void)close(fd); 128 return (-1); 129 } 130 131 /* Check magic number. */ 132 if (N_BADMAG(ebuf)) { 133 (void)close(fd); 134 return (-1); 135 } 136 137 /* 138 * We've recognized it as an a.out binary. From here 139 * on out, all errors are fatal. 140 */ 141 142 /* Check symbol count. */ 143 if (!ebuf.a_syms) 144 badfmt("stripped"); 145 146 /* Seek to string table. */ 147 if (lseek(fd, N_STROFF(ebuf), SEEK_SET) == -1) 148 badfmt("corrupted string table"); 149 150 /* Read in the size of the symbol table. */ 151 nr = read(fd, (char *)&strsize, sizeof(strsize)); 152 if (nr != sizeof(strsize)) 153 badread(nr, "no symbol table"); 154 155 /* Read in the string table. */ 156 strsize -= sizeof(strsize); 157 if (!(strtab = malloc(strsize))) { 158 warn("malloc"); 159 punt(); 160 } 161 if ((nr = read(fd, strtab, strsize)) != strsize) 162 badread(nr, "corrupted symbol table"); 163 164 /* Seek to symbol table. */ 165 if (!(fp = fdopen(fd, "r"))) { 166 warn("%s", name); 167 punt(); 168 } 169 if (fseek(fp, N_SYMOFF(ebuf), SEEK_SET) == -1) { 170 warn("%s", name); 171 punt(); 172 } 173 174 data.data = (u_char *)&nbuf; 175 data.size = sizeof(NLIST); 176 177 kerntextoff = get_kerntext(name); 178 179 /* Read each symbol and enter it into the database. */ 180 nsyms = ebuf.a_syms / sizeof(struct nlist); 181 while (nsyms--) { 182 if (fread((char *)&nbuf, sizeof (NLIST), 1, fp) != 1) { 183 if (feof(fp)) 184 badfmt("corrupted symbol table"); 185 warn("%s", name); 186 punt(); 187 } 188 if (!nbuf._strx || nbuf.n_type&N_STAB) 189 continue; 190 191 key.data = (u_char *)strtab + nbuf._strx - sizeof(long); 192 key.size = strlen((char *)key.data); 193 if (db->put(db, &key, &data, 0)) { 194 warn("record enter"); 195 punt(); 196 } 197 198 if (strcmp((char *)key.data, VRS_SYM) == 0) { 199 long cur_off, voff; 200 /* 201 * Calculate offset relative to a normal (non-kernel) 202 * a.out. Kerntextoff is where the kernel is really 203 * loaded; N_TXTADDR is where a normal file is loaded. 204 * From there, locate file offset in text or data. 205 */ 206 voff = nbuf.n_value - kerntextoff + N_TXTADDR(ebuf); 207 if ((nbuf.n_type & N_TYPE) == N_TEXT) 208 voff += N_TXTOFF(ebuf) - N_TXTADDR(ebuf); 209 else 210 voff += N_DATOFF(ebuf) - N_DATADDR(ebuf); 211 cur_off = ftell(fp); 212 if (fseek(fp, voff, SEEK_SET) == -1) 213 badfmt("corrupted string table"); 214 215 /* 216 * Read version string up to, and including newline. 217 * This code assumes that a newline terminates the 218 * version line. 219 */ 220 if (fgets(buf, sizeof(buf), fp) == NULL) 221 badfmt("corrupted string table"); 222 223 key.data = (u_char *)VRS_KEY; 224 key.size = sizeof(VRS_KEY) - 1; 225 data.data = (u_char *)buf; 226 data.size = strlen(buf); 227 if (db->put(db, &key, &data, 0)) { 228 warn("record enter"); 229 punt(); 230 } 231 232 /* Restore to original values. */ 233 data.data = (u_char *)&nbuf; 234 data.size = sizeof(NLIST); 235 if (fseek(fp, cur_off, SEEK_SET) == -1) 236 badfmt("corrupted string table"); 237 } 238 } 239 (void)fclose(fp); 240 241 return (0); 242 } 243 244 static void 245 badread(int nr, char *p) 246 { 247 if (nr < 0) { 248 warn("%s", kfile); 249 punt(); 250 } 251 badfmt(p); 252 } 253 254 /* 255 * Instead of compiling in KERNTEXTOFF or KERNBASE, try to 256 * determine the text start address from a standard symbol. 257 * For backward compatibility, use the old compiled-in way 258 * when the standard symbol name is not found. 259 */ 260 static u_long 261 get_kerntext(const char *name) 262 { 263 struct nlist nl[2]; 264 265 memset((caddr_t)nl, 0, sizeof(nl)); 266 nl[0].n_un.n_name = "_kernel_text"; 267 268 if (nlist(name, nl) != 0) { 269 warnx("%s: %s symbol missing", 270 name, nl[0].n_un.n_name); 271 punt(); 272 } 273 274 return (nl[0].n_value); 275 } 276 #endif /* NLIST_AOUT */ 277
Indexes created Sat Sep 20 22:09:52 GMT 2025