1/* $NetBSD: gelf_rel.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_rel.c,v 1.5 2024/03/03 17:37:34 christos Exp $"); 43 44GElf_Rel * 45gelf_getrel(Elf_Data *ed, int ndx, GElf_Rel *dst) 46{ 47 int ec; 48 Elf *e; 49 size_t msz; 50 Elf_Scn *scn; 51 uint32_t sh_type; 52 Elf32_Rel *rel32; 53 Elf64_Rel *rel64; 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_REL) { 74 LIBELF_SET_ERROR(ARGUMENT, 0); 75 return (NULL); 76 } 77 78 if ((msz = _libelf_msize(ELF_T_REL, 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 rel32 = (Elf32_Rel *) d->d_data.d_buf + ndx; 90 91 dst->r_offset = (Elf64_Addr) rel32->r_offset; 92 dst->r_info = ELF64_R_INFO( 93 (Elf64_Xword) ELF32_R_SYM(rel32->r_info), 94 ELF32_R_TYPE(rel32->r_info)); 95 96 } else { 97 98 rel64 = (Elf64_Rel *) d->d_data.d_buf + ndx; 99 100 *dst = *rel64; 101 } 102 103 return (dst); 104} 105 106int 107gelf_update_rel(Elf_Data *ed, int ndx, GElf_Rel *dr) 108{ 109 int ec; 110 Elf *e; 111 size_t msz; 112 Elf_Scn *scn; 113 uint32_t sh_type; 114 Elf32_Rel *rel32; 115 Elf64_Rel *rel64; 116 struct _Libelf_Data *d; 117 118 d = (struct _Libelf_Data *) ed; 119 120 if (d == NULL || ndx < 0 || dr == NULL || 121 (scn = d->d_scn) == NULL || 122 (e = scn->s_elf) == NULL) { 123 LIBELF_SET_ERROR(ARGUMENT, 0); 124 return (0); 125 } 126 127 ec = e->e_class; 128 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 129 130 if (ec == ELFCLASS32) 131 sh_type = scn->s_shdr.s_shdr32.sh_type; 132 else 133 sh_type = scn->s_shdr.s_shdr64.sh_type; 134 135 if (_libelf_xlate_shtype(sh_type) != ELF_T_REL) { 136 LIBELF_SET_ERROR(ARGUMENT, 0); 137 return (0); 138 } 139 140 if ((msz = _libelf_msize(ELF_T_REL, ec, e->e_version)) == 0) 141 return (0); 142 143 assert(ndx >= 0); 144 145 if (msz * (size_t) ndx >= d->d_data.d_size) { 146 LIBELF_SET_ERROR(ARGUMENT, 0); 147 return (0); 148 } 149 150 if (ec == ELFCLASS32) { 151 rel32 = (Elf32_Rel *) d->d_data.d_buf + ndx; 152 153 LIBELF_COPY_U32(rel32, dr, r_offset); 154 155 if (ELF64_R_SYM(dr->r_info) > ELF32_R_SYM(~0U) || 156 ELF64_R_TYPE(dr->r_info) > ELF32_R_TYPE(~0U)) { 157 LIBELF_SET_ERROR(RANGE, 0); 158 return (0); 159 } 160 rel32->r_info = ELF32_R_INFO( 161 (Elf32_Word) ELF64_R_SYM(dr->r_info), 162 (Elf32_Word) ELF64_R_TYPE(dr->r_info)); 163 } else { 164 rel64 = (Elf64_Rel *) d->d_data.d_buf + ndx; 165 166 *rel64 = *dr; 167 } 168 169 return (1); 170} 171