nlist_aout.c revision 1.16
1 /* $NetBSD: nlist_aout.c,v 1.16 2006/11/08 23:27:32 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 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 #if defined(LIBC_SCCS) && !defined(lint) 66 #if 0 67 static char sccsid[] = "@(#)nlist.c 8.1 (Berkeley) 6/4/93"; 68 #else 69 __RCSID("$NetBSD: nlist_aout.c,v 1.16 2006/11/08 23:27:32 christos Exp $"); 70 #endif 71 #endif /* LIBC_SCCS and not lint */ 72 73 #include "namespace.h" 74 #include <sys/param.h> 75 #include <sys/mman.h> 76 #include <sys/stat.h> 77 #include <sys/file.h> 78 79 #include <assert.h> 80 #include <errno.h> 81 #include <stdio.h> 82 #include <string.h> 83 #include <unistd.h> 84 #include <stdlib.h> 85 #include <a.out.h> /* for 'struct nlist' declaration */ 86 87 #include "nlist_private.h" 88 89 #ifdef NLIST_AOUT 90 int 91 __fdnlist_aout(fd, list) 92 int fd; 93 struct nlist *list; 94 { 95 struct nlist *p, *s; 96 char *strtab; 97 off_t stroff, symoff; 98 int nent; 99 size_t strsize, symsize, cc; 100 struct nlist nbuf[1024]; 101 struct exec exec; 102 struct stat st; 103 char *scoreboard, *scored; 104 105 _DIAGASSERT(fd != -1); 106 _DIAGASSERT(list != NULL); 107 108 if (pread(fd, &exec, sizeof(exec), (off_t)0) != sizeof(exec) || 109 N_BADMAG(exec) || fstat(fd, &st) < 0) 110 return (-1); 111 112 symoff = N_SYMOFF(exec); 113 symsize = (size_t)exec.a_syms; 114 stroff = symoff + symsize; 115 116 /* Check for files too large to mmap. */ 117 if (st.st_size - stroff > SIZE_T_MAX) { 118 errno = EFBIG; 119 return (-1); 120 } 121 /* 122 * Map string table into our address space. This gives us 123 * an easy way to randomly access all the strings, without 124 * making the memory allocation permanent as with malloc/free 125 * (i.e., munmap will return it to the system). 126 */ 127 strsize = (size_t)(st.st_size - stroff); 128 strtab = mmap(NULL, strsize, PROT_READ, MAP_PRIVATE|MAP_FILE, 129 fd, stroff); 130 if (strtab == (char *)-1) 131 return (-1); 132 /* 133 * clean out any left-over information for all valid entries. 134 * Type and value defined to be 0 if not found; historical 135 * versions cleared other and desc as well. Also figure out 136 * the largest string length so don't read any more of the 137 * string table than we have to. 138 * 139 * XXX clearing anything other than n_type and n_value violates 140 * the semantics given in the man page. 141 */ 142 nent = 0; 143 for (p = list; !ISLAST(p); ++p) { 144 p->n_type = 0; 145 p->n_other = 0; 146 p->n_desc = 0; 147 p->n_value = 0; 148 ++nent; 149 } 150 if (lseek(fd, symoff, SEEK_SET) == -1) 151 return (-1); 152 #if defined(__SSP__) || defined(__SSP_ALL__) 153 scoreboard = malloc((size_t)nent); 154 #else 155 scoreboard = alloca((size_t)nent); 156 #endif 157 if (scoreboard == NULL) 158 return (-1); 159 (void)memset(scoreboard, 0, (size_t)nent); 160 161 while (symsize > 0) { 162 cc = MIN(symsize, sizeof(nbuf)); 163 if (read(fd, nbuf, cc) != (ssize_t) cc) 164 break; 165 symsize -= cc; 166 for (s = nbuf; cc > 0; ++s, cc -= sizeof(*s)) { 167 long soff = s->n_un.n_strx; 168 169 if (soff == 0 || (s->n_type & N_STAB) != 0) 170 continue; 171 for (p = list, scored = scoreboard; !ISLAST(p); 172 p++, scored++) 173 if (*scored == 0 && 174 !strcmp(&strtab[(size_t)soff], 175 p->n_un.n_name)) { 176 p->n_value = s->n_value; 177 p->n_type = s->n_type; 178 p->n_desc = s->n_desc; 179 p->n_other = s->n_other; 180 *scored = 1; 181 if (--nent <= 0) 182 break; 183 } 184 } 185 } 186 munmap(strtab, strsize); 187 #if defined(__SSP__) || defined(__SSP_ALL__) 188 free(scoreboard); 189 #endif 190 return (nent); 191 } 192 #endif /* NLIST_AOUT */ 193
Indexes created Mon Sep 22 21:09:42 GMT 2025