1 /* $NetBSD: gelf_symshndx.c,v 1.3 2016/02/20 02:43:42 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 38 #include "_libelf.h" 39 40 __RCSID("$NetBSD: gelf_symshndx.c,v 1.3 2016/02/20 02:43:42 christos Exp $"); 41 ELFTC_VCSID("Id: gelf_symshndx.c 3174 2015-03-27 17:13:41Z emaste "); 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 (lid == NULL || (scn = lid->d_scn) == NULL || 61 (e = scn->s_elf) == NULL || (e != ld->d_scn->s_elf) || 62 shindex == NULL) { 63 LIBELF_SET_ERROR(ARGUMENT, 0); 64 return (NULL); 65 } 66 67 ec = e->e_class; 68 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 69 70 if (ec == ELFCLASS32) 71 sh_type = scn->s_shdr.s_shdr32.sh_type; 72 else 73 sh_type = scn->s_shdr.s_shdr64.sh_type; 74 75 if (_libelf_xlate_shtype(sh_type) != ELF_T_WORD || 76 id->d_type != ELF_T_WORD) { 77 LIBELF_SET_ERROR(ARGUMENT, 0); 78 return (NULL); 79 } 80 81 msz = _libelf_msize(ELF_T_WORD, ec, e->e_version); 82 83 assert(msz > 0); 84 assert(ndx >= 0); 85 86 if (msz * (size_t) ndx >= id->d_size) { 87 LIBELF_SET_ERROR(ARGUMENT, 0); 88 return (NULL); 89 } 90 91 *shindex = ((Elf32_Word *) id->d_buf)[ndx]; 92 93 return (dst); 94 } 95 96 int 97 gelf_update_symshndx(Elf_Data *d, Elf_Data *id, int ndx, GElf_Sym *gs, 98 Elf32_Word xindex) 99 { 100 int ec; 101 Elf *e; 102 size_t msz; 103 Elf_Scn *scn; 104 uint32_t sh_type; 105 struct _Libelf_Data *ld, *lid; 106 107 ld = (struct _Libelf_Data *) d; 108 lid = (struct _Libelf_Data *) id; 109 110 if (gelf_update_sym(d, ndx, gs) == 0) 111 return (0); 112 113 if (lid == NULL || (scn = lid->d_scn) == NULL || 114 (e = scn->s_elf) == NULL || (e != ld->d_scn->s_elf)) { 115 LIBELF_SET_ERROR(ARGUMENT, 0); 116 return (0); 117 } 118 119 ec = e->e_class; 120 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 121 122 if (ec == ELFCLASS32) 123 sh_type = scn->s_shdr.s_shdr32.sh_type; 124 else 125 sh_type = scn->s_shdr.s_shdr64.sh_type; 126 127 if (_libelf_xlate_shtype(sh_type) != ELF_T_WORD || 128 d->d_type != ELF_T_WORD) { 129 LIBELF_SET_ERROR(ARGUMENT, 0); 130 return (0); 131 } 132 133 msz = _libelf_msize(ELF_T_WORD, ec, e->e_version); 134 135 assert(msz > 0); 136 assert(ndx >= 0); 137 138 if (msz * (size_t) ndx >= id->d_size) { 139 LIBELF_SET_ERROR(ARGUMENT, 0); 140 return (0); 141 } 142 143 *(((Elf32_Word *) id->d_buf) + ndx) = xindex; 144 145 return (1); 146 } 147