1 /* Update REL relocation information at given index. 2 Copyright (C) 2000, 2001, 2002, 2005, 2009, 2014 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 37 #include "libelfP.h" 38 39 40 int 41 gelf_update_rel (Elf_Data *dst, int ndx, GElf_Rel *src) 42 { 43 Elf_Data_Scn *data_scn = (Elf_Data_Scn *) dst; 44 Elf_Scn *scn; 45 int result = 0; 46 47 if (dst == NULL) 48 return 0; 49 50 if (unlikely (data_scn->d.d_type != ELF_T_REL)) 51 { 52 /* The type of the data better should match. */ 53 __libelf_seterrno (ELF_E_DATA_MISMATCH); 54 return 0; 55 } 56 57 scn = data_scn->s; 58 rwlock_wrlock (scn->elf->lock); 59 60 if (scn->elf->class == ELFCLASS32) 61 { 62 Elf32_Rel *rel; 63 64 /* There is the possibility that the values in the input are 65 too large. */ 66 if (unlikely (src->r_offset > 0xffffffffull) 67 || unlikely (GELF_R_SYM (src->r_info) > 0xffffff) 68 || unlikely (GELF_R_TYPE (src->r_info) > 0xff)) 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_Rel, &data_scn->d)) 76 { 77 __libelf_seterrno (ELF_E_INVALID_INDEX); 78 goto out; 79 } 80 81 rel = &((Elf32_Rel *) data_scn->d.d_buf)[ndx]; 82 83 rel->r_offset = src->r_offset; 84 rel->r_info = ELF32_R_INFO (GELF_R_SYM (src->r_info), 85 GELF_R_TYPE (src->r_info)); 86 } 87 else 88 { 89 /* Check whether we have to resize the data buffer. */ 90 if (INVALID_NDX (ndx, Elf64_Rel, &data_scn->d)) 91 { 92 __libelf_seterrno (ELF_E_INVALID_INDEX); 93 goto out; 94 } 95 96 ((Elf64_Rel *) data_scn->d.d_buf)[ndx] = *src; 97 } 98 99 result = 1; 100 101 /* Mark the section as modified. */ 102 scn->flags |= ELF_F_DIRTY; 103 104 out: 105 rwlock_unlock (scn->elf->lock); 106 107 return result; 108 } 109
