1/* $NetBSD: gelf_dyn.c,v 1.5 2024/03/03 17:37:34 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#include <stdint.h> 39 40#include "_libelf.h" 41 42__RCSID("$NetBSD: gelf_dyn.c,v 1.5 2024/03/03 17:37:34 christos Exp $"); 43 44GElf_Dyn * 45gelf_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 if ((msz = _libelf_msize(ELF_T_DYN, ec, e->e_version)) == 0) 79 return (NULL); 80 81 assert(ndx >= 0); 82 83 if (msz * (size_t) ndx >= d->d_data.d_size) { 84 LIBELF_SET_ERROR(ARGUMENT, 0); 85 return (NULL); 86 } 87 88 if (ec == ELFCLASS32) { 89 dyn32 = (Elf32_Dyn *) d->d_data.d_buf + ndx; 90 91 dst->d_tag = dyn32->d_tag; 92 dst->d_un.d_val = (Elf64_Xword) dyn32->d_un.d_val; 93 94 } else { 95 96 dyn64 = (Elf64_Dyn *) d->d_data.d_buf + ndx; 97 98 *dst = *dyn64; 99 } 100 101 return (dst); 102} 103 104int 105gelf_update_dyn(Elf_Data *ed, int ndx, GElf_Dyn *ds) 106{ 107 int ec; 108 Elf *e; 109 size_t msz; 110 Elf_Scn *scn; 111 Elf32_Dyn *dyn32; 112 Elf64_Dyn *dyn64; 113 uint32_t sh_type; 114 struct _Libelf_Data *d; 115 116 d = (struct _Libelf_Data *) ed; 117 118 if (d == NULL || ndx < 0 || ds == NULL || 119 (scn = d->d_scn) == NULL || 120 (e = scn->s_elf) == NULL) { 121 LIBELF_SET_ERROR(ARGUMENT, 0); 122 return (0); 123 } 124 125 ec = e->e_class; 126 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 127 128 if (ec == ELFCLASS32) 129 sh_type = scn->s_shdr.s_shdr32.sh_type; 130 else 131 sh_type = scn->s_shdr.s_shdr64.sh_type; 132 133 if (_libelf_xlate_shtype(sh_type) != ELF_T_DYN) { 134 LIBELF_SET_ERROR(ARGUMENT, 0); 135 return (0); 136 } 137 138 if ((msz = _libelf_msize(ELF_T_DYN, ec, e->e_version)) == 0) 139 return (0); 140 141 assert(ndx >= 0); 142 143 if (msz * (size_t) ndx >= d->d_data.d_size) { 144 LIBELF_SET_ERROR(ARGUMENT, 0); 145 return (0); 146 } 147 148 if (ec == ELFCLASS32) { 149 dyn32 = (Elf32_Dyn *) d->d_data.d_buf + ndx; 150 151 LIBELF_COPY_S32(dyn32, ds, d_tag); 152 LIBELF_COPY_U32(dyn32, ds, d_un.d_val); 153 } else { 154 dyn64 = (Elf64_Dyn *) d->d_data.d_buf + ndx; 155 156 *dyn64 = *ds; 157 } 158 159 return (1); 160} 161