1/* $NetBSD: gelf_rela.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_rela.c,v 1.5 2024/03/03 17:37:34 christos Exp $"); 43ELFTC_VCSID("Id: gelf_rela.c 3977 2022-05-01 06:45:34Z jkoshy"); 44 45GElf_Rela * 46gelf_getrela(Elf_Data *ed, int ndx, GElf_Rela *dst) 47{ 48 int ec; 49 Elf *e; 50 size_t msz; 51 Elf_Scn *scn; 52 uint32_t sh_type; 53 Elf32_Rela *rela32; 54 Elf64_Rela *rela64; 55 struct _Libelf_Data *d; 56 57 d = (struct _Libelf_Data *) ed; 58 59 if (d == NULL || ndx < 0 || dst == NULL || 60 (scn = d->d_scn) == NULL || 61 (e = scn->s_elf) == NULL) { 62 LIBELF_SET_ERROR(ARGUMENT, 0); 63 return (NULL); 64 } 65 66 ec = e->e_class; 67 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 68 69 if (ec == ELFCLASS32) 70 sh_type = scn->s_shdr.s_shdr32.sh_type; 71 else 72 sh_type = scn->s_shdr.s_shdr64.sh_type; 73 74 if (_libelf_xlate_shtype(sh_type) != ELF_T_RELA) { 75 LIBELF_SET_ERROR(ARGUMENT, 0); 76 return (NULL); 77 } 78 79 if ((msz = _libelf_msize(ELF_T_RELA, ec, e->e_version)) == 0) 80 return (NULL); 81 82 assert(ndx >= 0); 83 84 if (msz * (size_t) ndx >= d->d_data.d_size) { 85 LIBELF_SET_ERROR(ARGUMENT, 0); 86 return (NULL); 87 } 88 89 if (ec == ELFCLASS32) { 90 rela32 = (Elf32_Rela *) d->d_data.d_buf + ndx; 91 92 dst->r_offset = (Elf64_Addr) rela32->r_offset; 93 dst->r_info = ELF64_R_INFO( 94 (Elf64_Xword) ELF32_R_SYM(rela32->r_info), 95 ELF32_R_TYPE(rela32->r_info)); 96 dst->r_addend = (Elf64_Sxword) rela32->r_addend; 97 98 } else { 99 100 rela64 = (Elf64_Rela *) d->d_data.d_buf + ndx; 101 102 *dst = *rela64; 103 } 104 105 return (dst); 106} 107 108int 109gelf_update_rela(Elf_Data *ed, int ndx, GElf_Rela *dr) 110{ 111 int ec; 112 Elf *e; 113 size_t msz; 114 Elf_Scn *scn; 115 uint32_t sh_type; 116 Elf32_Rela *rela32; 117 Elf64_Rela *rela64; 118 struct _Libelf_Data *d; 119 120 d = (struct _Libelf_Data *) ed; 121 122 if (d == NULL || ndx < 0 || dr == NULL || 123 (scn = d->d_scn) == NULL || 124 (e = scn->s_elf) == NULL) { 125 LIBELF_SET_ERROR(ARGUMENT, 0); 126 return (0); 127 } 128 129 ec = e->e_class; 130 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 131 132 if (ec == ELFCLASS32) 133 sh_type = scn->s_shdr.s_shdr32.sh_type; 134 else 135 sh_type = scn->s_shdr.s_shdr64.sh_type; 136 137 if (_libelf_xlate_shtype(sh_type) != ELF_T_RELA) { 138 LIBELF_SET_ERROR(ARGUMENT, 0); 139 return (0); 140 } 141 142 if ((msz = _libelf_msize(ELF_T_RELA, ec, e->e_version)) == 0) 143 return (0); 144 145 assert(ndx >= 0); 146 147 if (msz * (size_t) ndx >= d->d_data.d_size) { 148 LIBELF_SET_ERROR(ARGUMENT, 0); 149 return (0); 150 } 151 152 if (ec == ELFCLASS32) { 153 rela32 = (Elf32_Rela *) d->d_data.d_buf + ndx; 154 155 LIBELF_COPY_U32(rela32, dr, r_offset); 156 157 if (ELF64_R_SYM(dr->r_info) > ELF32_R_SYM(~0U) || 158 ELF64_R_TYPE(dr->r_info) > ELF32_R_TYPE(~0U)) { 159 LIBELF_SET_ERROR(RANGE, 0); 160 return (0); 161 } 162 rela32->r_info = ELF32_R_INFO( 163 (Elf32_Word) ELF64_R_SYM(dr->r_info), 164 (Elf32_Word) ELF64_R_TYPE(dr->r_info)); 165 166 LIBELF_COPY_S32(rela32, dr, r_addend); 167 } else { 168 rela64 = (Elf64_Rela *) d->d_data.d_buf + ndx; 169 170 *rela64 = *dr; 171 } 172 173 return (1); 174} 175