1 /* Update REL relocation information at given index. 2 Copyright (C) 2000, 2001, 2002 Red Hat, Inc. 3 Written by Ulrich Drepper <drepper (at) redhat.com>, 2000. 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation, version 2. 8 9 This program is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 GNU General Public License for more details. 13 14 You should have received a copy of the GNU General Public License 15 along with this program; if not, write to the Free Software Foundation, 16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 17 18 #ifdef HAVE_CONFIG_H 19 # include <config.h> 20 #endif 21 22 #include <gelf.h> 23 #include <stdlib.h> 24 25 #include "libelfP.h" 26 27 28 int 29 gelf_update_rel (Elf_Data *dst, int ndx, GElf_Rel *src) 30 { 31 Elf_Data_Scn *data_scn = (Elf_Data_Scn *) dst; 32 Elf_Scn *scn; 33 int result = 0; 34 35 if (dst == NULL) 36 return 0; 37 38 if (unlikely (ndx < 0)) 39 { 40 __libelf_seterrno (ELF_E_INVALID_INDEX); 41 return 0; 42 } 43 44 if (unlikely (data_scn->d.d_type != ELF_T_REL)) 45 { 46 /* The type of the data better should match. */ 47 __libelf_seterrno (ELF_E_DATA_MISMATCH); 48 return 0; 49 } 50 51 scn = data_scn->s; 52 rwlock_wrlock (scn->elf->lock); 53 54 if (scn->elf->class == ELFCLASS32) 55 { 56 Elf32_Rel *rel; 57 58 /* There is the possibility that the values in the input are 59 too large. */ 60 if (unlikely (src->r_offset > 0xffffffffull) 61 || unlikely (GELF_R_SYM (src->r_info) > 0xffffff) 62 || unlikely (GELF_R_TYPE (src->r_info) > 0xff)) 63 { 64 __libelf_seterrno (ELF_E_INVALID_DATA); 65 goto out; 66 } 67 68 /* Check whether we have to resize the data buffer. */ 69 if (unlikely ((ndx + 1) * sizeof (Elf32_Rel) > data_scn->d.d_size)) 70 { 71 __libelf_seterrno (ELF_E_INVALID_INDEX); 72 goto out; 73 } 74 75 rel = &((Elf32_Rel *) data_scn->d.d_buf)[ndx]; 76 77 rel->r_offset = src->r_offset; 78 rel->r_info = ELF32_R_INFO (GELF_R_SYM (src->r_info), 79 GELF_R_TYPE (src->r_info)); 80 } 81 else 82 { 83 /* Check whether we have to resize the data buffer. */ 84 if (unlikely ((ndx + 1) * sizeof (Elf64_Rel) > data_scn->d.d_size)) 85 { 86 __libelf_seterrno (ELF_E_INVALID_INDEX); 87 goto out; 88 } 89 90 ((Elf64_Rel *) data_scn->d.d_buf)[ndx] = *src; 91 } 92 93 result = 1; 94 95 /* Mark the section as modified. */ 96 scn->flags |= ELF_F_DIRTY; 97 98 out: 99 rwlock_unlock (scn->elf->lock); 100 101 return result; 102 } 103
