1 /* $NetBSD: gelf_symshndx.c,v 1.5 2024/03/03 17:37:34 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2006,2008,2020 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 38 #include "_libelf.h" 39 40 __RCSID("$NetBSD: gelf_symshndx.c,v 1.5 2024/03/03 17:37:34 christos Exp $"); 41 ELFTC_VCSID("Id: gelf_symshndx.c 3977 2022-05-01 06:45:34Z jkoshy"); 42 43 GElf_Sym * 44 gelf_getsymshndx(Elf_Data *d, Elf_Data *id, int ndx, GElf_Sym *dst, 45 Elf32_Word *shindex) 46 { 47 int ec; 48 Elf *e; 49 size_t msz; 50 Elf_Scn *scn; 51 uint32_t sh_type; 52 struct _Libelf_Data *ld, *lid; 53 54 ld = (struct _Libelf_Data *) d; 55 lid = (struct _Libelf_Data *) id; 56 57 if (gelf_getsym(d, ndx, dst) == 0) 58 return (NULL); 59 60 if (shindex == NULL) 61 return (dst); 62 63 if (lid == NULL) { 64 *shindex = 0; 65 return (dst); 66 } 67 68 if ((scn = lid->d_scn) == NULL || 69 (e = scn->s_elf) == NULL || (e != ld->d_scn->s_elf)) { 70 LIBELF_SET_ERROR(ARGUMENT, 0); 71 return (NULL); 72 } 73 74 ec = e->e_class; 75 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 76 77 if (ec == ELFCLASS32) 78 sh_type = scn->s_shdr.s_shdr32.sh_type; 79 else 80 sh_type = scn->s_shdr.s_shdr64.sh_type; 81 82 if (_libelf_xlate_shtype(sh_type) != ELF_T_WORD || 83 id->d_type != ELF_T_WORD) { 84 LIBELF_SET_ERROR(ARGUMENT, 0); 85 return (NULL); 86 } 87 88 if ((msz = _libelf_msize(ELF_T_WORD, ec, e->e_version)) == 0) 89 return (NULL); 90 91 assert(ndx >= 0); 92 93 if (msz * (size_t) ndx >= id->d_size) { 94 LIBELF_SET_ERROR(ARGUMENT, 0); 95 return (NULL); 96 } 97 98 *shindex = ((Elf32_Word *) id->d_buf)[ndx]; 99 100 return (dst); 101 } 102 103 int 104 gelf_update_symshndx(Elf_Data *d, Elf_Data *id, int ndx, GElf_Sym *gs, 105 Elf32_Word xindex) 106 { 107 int ec; 108 Elf *e; 109 size_t msz; 110 Elf_Scn *scn; 111 uint32_t sh_type; 112 struct _Libelf_Data *ld, *lid; 113 114 ld = (struct _Libelf_Data *) d; 115 lid = (struct _Libelf_Data *) id; 116 117 if (gelf_update_sym(d, ndx, gs) == 0) 118 return (0); 119 120 if (lid == NULL || (scn = lid->d_scn) == NULL || 121 (e = scn->s_elf) == NULL || (e != ld->d_scn->s_elf)) { 122 LIBELF_SET_ERROR(ARGUMENT, 0); 123 return (0); 124 } 125 126 ec = e->e_class; 127 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 128 129 if (ec == ELFCLASS32) 130 sh_type = scn->s_shdr.s_shdr32.sh_type; 131 else 132 sh_type = scn->s_shdr.s_shdr64.sh_type; 133 134 if (_libelf_xlate_shtype(sh_type) != ELF_T_WORD || 135 d->d_type != ELF_T_WORD) { 136 LIBELF_SET_ERROR(ARGUMENT, 0); 137 return (0); 138 } 139 140 if ((msz = _libelf_msize(ELF_T_WORD, ec, e->e_version)) == 0) 141 return (0); 142 143 assert(ndx >= 0); 144 145 if (msz * (size_t) ndx >= id->d_size) { 146 LIBELF_SET_ERROR(ARGUMENT, 0); 147 return (0); 148 } 149 150 *(((Elf32_Word *) id->d_buf) + ndx) = xindex; 151 152 return (1); 153 } 154