1 /* $NetBSD: gelf_dyn.c,v 1.2 2014/03/09 16:58:04 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2006,2008 Joseph Koshy 5 * 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 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #if HAVE_NBTOOL_CONFIG_H 30 # include "nbtool_config.h" 31 #endif 32 33 #include <sys/cdefs.h> 34 35 #include <assert.h> 36 #include <gelf.h> 37 #include <limits.h> 38 39 #include "_libelf.h" 40 41 __RCSID("$NetBSD: gelf_dyn.c,v 1.2 2014/03/09 16:58:04 christos Exp $"); 42 ELFTC_VCSID("Id: gelf_dyn.c 2272 2011-12-03 17:07:31Z jkoshy "); 43 44 GElf_Dyn * 45 gelf_getdyn(Elf_Data *ed, int ndx, GElf_Dyn *dst) 46 { 47 int ec; 48 Elf *e; 49 size_t msz; 50 Elf_Scn *scn; 51 Elf32_Dyn *dyn32; 52 Elf64_Dyn *dyn64; 53 uint32_t sh_type; 54 struct _Libelf_Data *d; 55 56 d = (struct _Libelf_Data *) ed; 57 58 if (d == NULL || ndx < 0 || dst == NULL || 59 (scn = d->d_scn) == NULL || 60 (e = scn->s_elf) == NULL) { 61 LIBELF_SET_ERROR(ARGUMENT, 0); 62 return (NULL); 63 } 64 65 ec = e->e_class; 66 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 67 68 if (ec == ELFCLASS32) 69 sh_type = scn->s_shdr.s_shdr32.sh_type; 70 else 71 sh_type = scn->s_shdr.s_shdr64.sh_type; 72 73 if (_libelf_xlate_shtype(sh_type) != ELF_T_DYN) { 74 LIBELF_SET_ERROR(ARGUMENT, 0); 75 return (NULL); 76 } 77 78 msz = _libelf_msize(ELF_T_DYN, ec, e->e_version); 79 80 assert(msz > 0); 81 82 if (msz * ndx >= d->d_data.d_size) { 83 LIBELF_SET_ERROR(ARGUMENT, 0); 84 return (NULL); 85 } 86 87 if (ec == ELFCLASS32) { 88 dyn32 = (Elf32_Dyn *) d->d_data.d_buf + ndx; 89 90 dst->d_tag = dyn32->d_tag; 91 dst->d_un.d_val = (Elf64_Xword) dyn32->d_un.d_val; 92 93 } else { 94 95 dyn64 = (Elf64_Dyn *) d->d_data.d_buf + ndx; 96 97 *dst = *dyn64; 98 } 99 100 return (dst); 101 } 102 103 int 104 gelf_update_dyn(Elf_Data *ed, int ndx, GElf_Dyn *ds) 105 { 106 int ec; 107 Elf *e; 108 size_t msz; 109 Elf_Scn *scn; 110 Elf32_Dyn *dyn32; 111 Elf64_Dyn *dyn64; 112 uint32_t sh_type; 113 struct _Libelf_Data *d; 114 115 d = (struct _Libelf_Data *) ed; 116 117 if (d == NULL || ndx < 0 || ds == NULL || 118 (scn = d->d_scn) == NULL || 119 (e = scn->s_elf) == NULL) { 120 LIBELF_SET_ERROR(ARGUMENT, 0); 121 return (0); 122 } 123 124 ec = e->e_class; 125 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 126 127 if (ec == ELFCLASS32) 128 sh_type = scn->s_shdr.s_shdr32.sh_type; 129 else 130 sh_type = scn->s_shdr.s_shdr64.sh_type; 131 132 if (_libelf_xlate_shtype(sh_type) != ELF_T_DYN) { 133 LIBELF_SET_ERROR(ARGUMENT, 0); 134 return (0); 135 } 136 137 msz = _libelf_msize(ELF_T_DYN, ec, e->e_version); 138 assert(msz > 0); 139 140 if (msz * ndx >= d->d_data.d_size) { 141 LIBELF_SET_ERROR(ARGUMENT, 0); 142 return (0); 143 } 144 145 if (ec == ELFCLASS32) { 146 dyn32 = (Elf32_Dyn *) d->d_data.d_buf + ndx; 147 148 LIBELF_COPY_S32(dyn32, ds, d_tag); 149 LIBELF_COPY_U32(dyn32, ds, d_un.d_val); 150 } else { 151 dyn64 = (Elf64_Dyn *) d->d_data.d_buf + ndx; 152 153 *dyn64 = *ds; 154 } 155 156 return (1); 157 } 158