125b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* Update REL relocation information at given index. 203333823c75a1c1887e923828113a1b0fd12020cElliott Hughes Copyright (C) 2000, 2001, 2002, 2005, 2009, 2014 Red Hat, Inc. 303333823c75a1c1887e923828113a1b0fd12020cElliott Hughes This file is part of elfutils. 425b3c049e70834cf33790a28643ab058b507b35cBen Cheng Written by Ulrich Drepper <drepper@redhat.com>, 2000. 525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 603333823c75a1c1887e923828113a1b0fd12020cElliott Hughes This file is free software; you can redistribute it and/or modify 703333823c75a1c1887e923828113a1b0fd12020cElliott Hughes it under the terms of either 825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 903333823c75a1c1887e923828113a1b0fd12020cElliott Hughes * the GNU Lesser General Public License as published by the Free 1003333823c75a1c1887e923828113a1b0fd12020cElliott Hughes Software Foundation; either version 3 of the License, or (at 1103333823c75a1c1887e923828113a1b0fd12020cElliott Hughes your option) any later version 1203333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 1303333823c75a1c1887e923828113a1b0fd12020cElliott Hughes or 1403333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 1503333823c75a1c1887e923828113a1b0fd12020cElliott Hughes * the GNU General Public License as published by the Free 1603333823c75a1c1887e923828113a1b0fd12020cElliott Hughes Software Foundation; either version 2 of the License, or (at 1703333823c75a1c1887e923828113a1b0fd12020cElliott Hughes your option) any later version 1803333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 1903333823c75a1c1887e923828113a1b0fd12020cElliott Hughes or both in parallel, as here. 2003333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 2103333823c75a1c1887e923828113a1b0fd12020cElliott Hughes elfutils is distributed in the hope that it will be useful, but 2225b3c049e70834cf33790a28643ab058b507b35cBen Cheng WITHOUT ANY WARRANTY; without even the implied warranty of 2325b3c049e70834cf33790a28643ab058b507b35cBen Cheng MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 2425b3c049e70834cf33790a28643ab058b507b35cBen Cheng General Public License for more details. 2525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 2603333823c75a1c1887e923828113a1b0fd12020cElliott Hughes You should have received copies of the GNU General Public License and 2703333823c75a1c1887e923828113a1b0fd12020cElliott Hughes the GNU Lesser General Public License along with this program. If 2803333823c75a1c1887e923828113a1b0fd12020cElliott Hughes not, see <http://www.gnu.org/licenses/>. */ 2925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 3025b3c049e70834cf33790a28643ab058b507b35cBen Cheng#ifdef HAVE_CONFIG_H 3125b3c049e70834cf33790a28643ab058b507b35cBen Cheng# include <config.h> 3225b3c049e70834cf33790a28643ab058b507b35cBen Cheng#endif 3325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 3425b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <gelf.h> 3525b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <stdlib.h> 3625b3c049e70834cf33790a28643ab058b507b35cBen Cheng 3725b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include "libelfP.h" 3825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 3925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 4025b3c049e70834cf33790a28643ab058b507b35cBen Chengint 4125b3c049e70834cf33790a28643ab058b507b35cBen Chenggelf_update_rel (Elf_Data *dst, int ndx, GElf_Rel *src) 4225b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 4325b3c049e70834cf33790a28643ab058b507b35cBen Cheng Elf_Data_Scn *data_scn = (Elf_Data_Scn *) dst; 4425b3c049e70834cf33790a28643ab058b507b35cBen Cheng Elf_Scn *scn; 4525b3c049e70834cf33790a28643ab058b507b35cBen Cheng int result = 0; 4625b3c049e70834cf33790a28643ab058b507b35cBen Cheng 4725b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (dst == NULL) 4825b3c049e70834cf33790a28643ab058b507b35cBen Cheng return 0; 4925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 5025b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (unlikely (data_scn->d.d_type != ELF_T_REL)) 5125b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 5225b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* The type of the data better should match. */ 5325b3c049e70834cf33790a28643ab058b507b35cBen Cheng __libelf_seterrno (ELF_E_DATA_MISMATCH); 5425b3c049e70834cf33790a28643ab058b507b35cBen Cheng return 0; 5525b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 5625b3c049e70834cf33790a28643ab058b507b35cBen Cheng 5725b3c049e70834cf33790a28643ab058b507b35cBen Cheng scn = data_scn->s; 5825b3c049e70834cf33790a28643ab058b507b35cBen Cheng rwlock_wrlock (scn->elf->lock); 5925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 6025b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (scn->elf->class == ELFCLASS32) 6125b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 6225b3c049e70834cf33790a28643ab058b507b35cBen Cheng Elf32_Rel *rel; 6325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 6425b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* There is the possibility that the values in the input are 6525b3c049e70834cf33790a28643ab058b507b35cBen Cheng too large. */ 6625b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (unlikely (src->r_offset > 0xffffffffull) 6725b3c049e70834cf33790a28643ab058b507b35cBen Cheng || unlikely (GELF_R_SYM (src->r_info) > 0xffffff) 6825b3c049e70834cf33790a28643ab058b507b35cBen Cheng || unlikely (GELF_R_TYPE (src->r_info) > 0xff)) 6925b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 7025b3c049e70834cf33790a28643ab058b507b35cBen Cheng __libelf_seterrno (ELF_E_INVALID_DATA); 7125b3c049e70834cf33790a28643ab058b507b35cBen Cheng goto out; 7225b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 7325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 7425b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* Check whether we have to resize the data buffer. */ 7503333823c75a1c1887e923828113a1b0fd12020cElliott Hughes if (INVALID_NDX (ndx, Elf32_Rel, &data_scn->d)) 7625b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 7725b3c049e70834cf33790a28643ab058b507b35cBen Cheng __libelf_seterrno (ELF_E_INVALID_INDEX); 7825b3c049e70834cf33790a28643ab058b507b35cBen Cheng goto out; 7925b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 8025b3c049e70834cf33790a28643ab058b507b35cBen Cheng 8125b3c049e70834cf33790a28643ab058b507b35cBen Cheng rel = &((Elf32_Rel *) data_scn->d.d_buf)[ndx]; 8225b3c049e70834cf33790a28643ab058b507b35cBen Cheng 8325b3c049e70834cf33790a28643ab058b507b35cBen Cheng rel->r_offset = src->r_offset; 8425b3c049e70834cf33790a28643ab058b507b35cBen Cheng rel->r_info = ELF32_R_INFO (GELF_R_SYM (src->r_info), 8525b3c049e70834cf33790a28643ab058b507b35cBen Cheng GELF_R_TYPE (src->r_info)); 8625b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 8725b3c049e70834cf33790a28643ab058b507b35cBen Cheng else 8825b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 8925b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* Check whether we have to resize the data buffer. */ 9003333823c75a1c1887e923828113a1b0fd12020cElliott Hughes if (INVALID_NDX (ndx, Elf64_Rel, &data_scn->d)) 9125b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 9225b3c049e70834cf33790a28643ab058b507b35cBen Cheng __libelf_seterrno (ELF_E_INVALID_INDEX); 9325b3c049e70834cf33790a28643ab058b507b35cBen Cheng goto out; 9425b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 9525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 9625b3c049e70834cf33790a28643ab058b507b35cBen Cheng ((Elf64_Rel *) data_scn->d.d_buf)[ndx] = *src; 9725b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 9825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 9925b3c049e70834cf33790a28643ab058b507b35cBen Cheng result = 1; 10025b3c049e70834cf33790a28643ab058b507b35cBen Cheng 10125b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* Mark the section as modified. */ 10225b3c049e70834cf33790a28643ab058b507b35cBen Cheng scn->flags |= ELF_F_DIRTY; 10325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 10425b3c049e70834cf33790a28643ab058b507b35cBen Cheng out: 10525b3c049e70834cf33790a28643ab058b507b35cBen Cheng rwlock_unlock (scn->elf->lock); 10625b3c049e70834cf33790a28643ab058b507b35cBen Cheng 10725b3c049e70834cf33790a28643ab058b507b35cBen Cheng return result; 10825b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 109