1 /* Update symbol information in symbol table at the given index. 2 Copyright (C) 2000, 2001, 2002, 2005, 2009, 2014, 2015 Red Hat, Inc. 3 This file is part of elfutils. 4 Written by Ulrich Drepper <drepper (at) redhat.com>, 2000. 5 6 This file is free software; you can redistribute it and/or modify 7 it under the terms of either 8 9 * the GNU Lesser General Public License as published by the Free 10 Software Foundation; either version 3 of the License, or (at 11 your option) any later version 12 13 or 14 15 * the GNU General Public License as published by the Free 16 Software Foundation; either version 2 of the License, or (at 17 your option) any later version 18 19 or both in parallel, as here. 20 21 elfutils is distributed in the hope that it will be useful, but 22 WITHOUT ANY WARRANTY; without even the implied warranty of 23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 24 General Public License for more details. 25 26 You should have received copies of the GNU General Public License and 27 the GNU Lesser General Public License along with this program. If 28 not, see <http://www.gnu.org/licenses/>. */ 29 30 #ifdef HAVE_CONFIG_H 31 # include <config.h> 32 #endif 33 34 #include <gelf.h> 35 #include <stdlib.h> 36 #include <string.h> 37 38 #include "libelfP.h" 39 40 41 int 42 gelf_update_sym (Elf_Data *data, int ndx, GElf_Sym *src) 43 { 44 Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data; 45 Elf_Scn *scn; 46 int result = 0; 47 48 if (data == NULL) 49 return 0; 50 51 if (unlikely (data_scn->d.d_type != ELF_T_SYM)) 52 { 53 /* The type of the data better should match. */ 54 __libelf_seterrno (ELF_E_DATA_MISMATCH); 55 return 0; 56 } 57 58 scn = data_scn->s; 59 rwlock_wrlock (scn->elf->lock); 60 61 if (scn->elf->class == ELFCLASS32) 62 { 63 Elf32_Sym *sym; 64 65 /* There is the possibility that the values in the input are 66 too large. */ 67 if (unlikely (src->st_value > 0xffffffffull) 68 || unlikely (src->st_size > 0xffffffffull)) 69 { 70 __libelf_seterrno (ELF_E_INVALID_DATA); 71 goto out; 72 } 73 74 /* Check whether we have to resize the data buffer. */ 75 if (INVALID_NDX (ndx, Elf32_Sym, &data_scn->d)) 76 { 77 __libelf_seterrno (ELF_E_INVALID_INDEX); 78 goto out; 79 } 80 81 sym = &((Elf32_Sym *) data_scn->d.d_buf)[ndx]; 82 83 #define COPY(name) \ 84 sym->name = src->name 85 COPY (st_name); 86 COPY (st_value); 87 COPY (st_size); 88 /* Please note that we can simply copy the `st_info' element since 89 the definitions of ELFxx_ST_BIND and ELFxx_ST_TYPE are the same 90 for the 64 bit variant. */ 91 COPY (st_info); 92 COPY (st_other); 93 COPY (st_shndx); 94 } 95 else 96 { 97 /* Check whether we have to resize the data buffer. */ 98 if (INVALID_NDX (ndx, Elf64_Sym, &data_scn->d)) 99 { 100 __libelf_seterrno (ELF_E_INVALID_INDEX); 101 goto out; 102 } 103 104 ((Elf64_Sym *) data_scn->d.d_buf)[ndx] = *src; 105 } 106 107 result = 1; 108 109 /* Mark the section as modified. */ 110 scn->flags |= ELF_F_DIRTY; 111 112 out: 113 rwlock_unlock (scn->elf->lock); 114 115 return result; 116 } 117
