1 /* $NetBSD: gelf_rel.c,v 1.4 2022/05/01 19:41:35 jkoshy 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 1.4 2022/05/01 19:41:35 jkoshy Exp $"); 43 ELFTC_VCSID("Id: gelf_rel.c 3177 2015-03-30 18:19:41Z emaste"); 44 45 GElf_Rel * 46 gelf_getrel(Elf_Data *ed, int ndx, GElf_Rel *dst) 47 { 48 int ec; 49 Elf *e; 50 size_t msz; 51 Elf_Scn *scn; 52 uint32_t sh_type; 53 Elf32_Rel *rel32; 54 Elf64_Rel *rel64; 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_REL) { 75 LIBELF_SET_ERROR(ARGUMENT, 0); 76 return (NULL); 77 } 78 79 msz = _libelf_msize(ELF_T_REL, ec, e->e_version); 80 81 assert(msz > 0); 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 rel32 = (Elf32_Rel *) d->d_data.d_buf + ndx; 91 92 dst->r_offset = (Elf64_Addr) rel32->r_offset; 93 dst->r_info = ELF64_R_INFO( 94 (Elf64_Xword) ELF32_R_SYM(rel32->r_info), 95 ELF32_R_TYPE(rel32->r_info)); 96 97 } else { 98 99 rel64 = (Elf64_Rel *) d->d_data.d_buf + ndx; 100 101 *dst = *rel64; 102 } 103 104 return (dst); 105 } 106 107 int 108 gelf_update_rel(Elf_Data *ed, int ndx, GElf_Rel *dr) 109 { 110 int ec; 111 Elf *e; 112 size_t msz; 113 Elf_Scn *scn; 114 uint32_t sh_type; 115 Elf32_Rel *rel32; 116 Elf64_Rel *rel64; 117 struct _Libelf_Data *d; 118 119 d = (struct _Libelf_Data *) ed; 120 121 if (d == NULL || ndx < 0 || dr == NULL || 122 (scn = d->d_scn) == NULL || 123 (e = scn->s_elf) == NULL) { 124 LIBELF_SET_ERROR(ARGUMENT, 0); 125 return (0); 126 } 127 128 ec = e->e_class; 129 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 130 131 if (ec == ELFCLASS32) 132 sh_type = scn->s_shdr.s_shdr32.sh_type; 133 else 134 sh_type = scn->s_shdr.s_shdr64.sh_type; 135 136 if (_libelf_xlate_shtype(sh_type) != ELF_T_REL) { 137 LIBELF_SET_ERROR(ARGUMENT, 0); 138 return (0); 139 } 140 141 msz = _libelf_msize(ELF_T_REL, ec, e->e_version); 142 143 assert(msz > 0); 144 assert(ndx >= 0); 145 146 if (msz * (size_t) ndx >= d->d_data.d_size) { 147 LIBELF_SET_ERROR(ARGUMENT, 0); 148 return (0); 149 } 150 151 if (ec == ELFCLASS32) { 152 rel32 = (Elf32_Rel *) d->d_data.d_buf + ndx; 153 154 LIBELF_COPY_U32(rel32, dr, r_offset); 155 156 if (ELF64_R_SYM(dr->r_info) > ELF32_R_SYM(~0UL) || 157 ELF64_R_TYPE(dr->r_info) > ELF32_R_TYPE(~0U)) { 158 LIBELF_SET_ERROR(RANGE, 0); 159 return (0); 160 } 161 rel32->r_info = ELF32_R_INFO( 162 (Elf32_Word) ELF64_R_SYM(dr->r_info), 163 (Elf32_Word) ELF64_R_TYPE(dr->r_info)); 164 } else { 165 rel64 = (Elf64_Rel *) d->d_data.d_buf + ndx; 166 167 *rel64 = *dr; 168 } 169 170 return (1); 171 } 172