1/* Update symbol information and section index in symbol table at the 2 given index. 3 Copyright (C) 2000, 2001, 2002 Red Hat, Inc. 4 This file is part of Red Hat elfutils. 5 Written by Ulrich Drepper <drepper@redhat.com>, 2000. 6 7 Red Hat elfutils is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by the 9 Free Software Foundation; version 2 of the License. 10 11 Red Hat elfutils is distributed in the hope that it will be useful, but 12 WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 General Public License for more details. 15 16 You should have received a copy of the GNU General Public License along 17 with Red Hat elfutils; if not, write to the Free Software Foundation, 18 Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. 19 20 In addition, as a special exception, Red Hat, Inc. gives You the 21 additional right to link the code of Red Hat elfutils with code licensed 22 under any Open Source Initiative certified open source license 23 (http://www.opensource.org/licenses/index.php) which requires the 24 distribution of source code with any binary distribution and to 25 distribute linked combinations of the two. Non-GPL Code permitted under 26 this exception must only link to the code of Red Hat elfutils through 27 those well defined interfaces identified in the file named EXCEPTION 28 found in the source code files (the "Approved Interfaces"). The files 29 of Non-GPL Code may instantiate templates or use macros or inline 30 functions from the Approved Interfaces without causing the resulting 31 work to be covered by the GNU General Public License. Only Red Hat, 32 Inc. may make changes or additions to the list of Approved Interfaces. 33 Red Hat's grant of this exception is conditioned upon your not adding 34 any new exceptions. If you wish to add a new Approved Interface or 35 exception, please contact Red Hat. You must obey the GNU General Public 36 License in all respects for all of the Red Hat elfutils code and other 37 code used in conjunction with Red Hat elfutils except the Non-GPL Code 38 covered by this exception. If you modify this file, you may extend this 39 exception to your version of the file, but you are not obligated to do 40 so. If you do not wish to provide this exception without modification, 41 you must delete this exception statement from your version and license 42 this file solely under the GPL without exception. 43 44 Red Hat elfutils is an included package of the Open Invention Network. 45 An included package of the Open Invention Network is a package for which 46 Open Invention Network licensees cross-license their patents. No patent 47 license is granted, either expressly or impliedly, by designation as an 48 included package. Should you wish to participate in the Open Invention 49 Network licensing program, please visit www.openinventionnetwork.com 50 <http://www.openinventionnetwork.com>. */ 51 52#ifdef HAVE_CONFIG_H 53# include <config.h> 54#endif 55 56#include <gelf.h> 57#include <stdlib.h> 58#include <string.h> 59 60#include "libelfP.h" 61 62 63int 64gelf_update_symshndx (symdata, shndxdata, ndx, src, srcshndx) 65 Elf_Data *symdata; 66 Elf_Data *shndxdata; 67 int ndx; 68 GElf_Sym *src; 69 Elf32_Word srcshndx; 70{ 71 Elf_Data_Scn *symdata_scn = (Elf_Data_Scn *) symdata; 72 Elf_Data_Scn *shndxdata_scn = (Elf_Data_Scn *) shndxdata; 73 Elf_Scn *scn; 74 Elf32_Word *shndx = NULL; 75 int result = 0; 76 77 if (symdata == NULL) 78 return 0; 79 80 if (unlikely (ndx < 0)) 81 { 82 __libelf_seterrno (ELF_E_INVALID_INDEX); 83 return 0; 84 } 85 86 if (unlikely (symdata_scn->d.d_type != ELF_T_SYM)) 87 { 88 /* The type of the data better should match. */ 89 __libelf_seterrno (ELF_E_DATA_MISMATCH); 90 return 0; 91 } 92 93 scn = symdata_scn->s; 94 /* We simply have to believe the user that the two sections belong to 95 the same ELF file. */ 96 rwlock_wrlock (scn->elf->lock); 97 98 /* The user is not required to pass a data descriptor for an extended 99 section index table. */ 100 if (shndxdata_scn != NULL) 101 { 102 if (unlikely ((ndx + 1) * sizeof (Elf32_Word) > shndxdata_scn->d.d_size)) 103 { 104 __libelf_seterrno (ELF_E_INVALID_INDEX); 105 goto out; 106 } 107 108 shndx = &((Elf32_Word *) shndxdata_scn->d.d_buf)[ndx]; 109 } 110 /* But if s/he does not the extended sectio index must be zero. */ 111 else if (unlikely (srcshndx != 0)) 112 { 113 __libelf_seterrno (ELF_E_INVALID_INDEX); 114 goto out; 115 } 116 117 if (scn->elf->class == ELFCLASS32) 118 { 119 Elf32_Sym *sym; 120 121 /* There is the possibility that the values in the input are 122 too large. */ 123 if (unlikely (src->st_value > 0xffffffffull) 124 || unlikely (src->st_size > 0xffffffffull)) 125 { 126 __libelf_seterrno (ELF_E_INVALID_DATA); 127 goto out; 128 } 129 130 /* Check whether we have to resize the data buffer. */ 131 if (unlikely ((ndx + 1) * sizeof (Elf32_Sym) > symdata_scn->d.d_size)) 132 { 133 __libelf_seterrno (ELF_E_INVALID_INDEX); 134 goto out; 135 } 136 137 sym = &((Elf32_Sym *) symdata_scn->d.d_buf)[ndx]; 138 139#define COPY(name) \ 140 sym->name = src->name 141 COPY (st_name); 142 COPY (st_value); 143 COPY (st_size); 144 /* Please note that we can simply copy the `st_info' element since 145 the definitions of ELFxx_ST_BIND and ELFxx_ST_TYPE are the same 146 for the 64 bit variant. */ 147 COPY (st_info); 148 COPY (st_other); 149 COPY (st_shndx); 150 } 151 else 152 { 153 /* Check whether we have to resize the data buffer. */ 154 if (unlikely ((ndx + 1) * sizeof (Elf64_Sym) > symdata_scn->d.d_size)) 155 { 156 __libelf_seterrno (ELF_E_INVALID_INDEX); 157 goto out; 158 } 159 160 ((Elf64_Sym *) symdata_scn->d.d_buf)[ndx] = *src; 161 } 162 163 /* Now we can store the section index. */ 164 if (shndx != NULL) 165 *shndx = srcshndx; 166 167 result = 1; 168 169 /* Mark the section as modified. */ 170 scn->flags |= ELF_F_DIRTY; 171 172 out: 173 rwlock_unlock (scn->elf->lock); 174 175 return result; 176} 177