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146 lines
3.8 KiB
146 lines
3.8 KiB
/* Update symbol information and section index in symbol table at the
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given index.
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Copyright (C) 2000, 2001, 2002, 2005, 2009, 2014, 2015 Red Hat, Inc.
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This file is part of elfutils.
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Written by Ulrich Drepper <drepper@redhat.com>, 2000.
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This file is free software; you can redistribute it and/or modify
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it under the terms of either
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at
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your option) any later version
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at
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your option) any later version
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or both in parallel, as here.
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elfutils is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see <http://www.gnu.org/licenses/>. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <gelf.h>
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#include <stdlib.h>
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#include <string.h>
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#include "libelfP.h"
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int
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gelf_update_symshndx (Elf_Data *symdata, Elf_Data *shndxdata, int ndx,
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GElf_Sym *src, Elf32_Word srcshndx)
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{
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Elf_Data_Scn *symdata_scn = (Elf_Data_Scn *) symdata;
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Elf_Data_Scn *shndxdata_scn = (Elf_Data_Scn *) shndxdata;
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Elf_Scn *scn;
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Elf32_Word *shndx = NULL;
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int result = 0;
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if (symdata == NULL)
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return 0;
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if (unlikely (symdata_scn->d.d_type != ELF_T_SYM))
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{
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/* The type of the data better should match. */
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__libelf_seterrno (ELF_E_DATA_MISMATCH);
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return 0;
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}
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scn = symdata_scn->s;
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/* We simply have to believe the user that the two sections belong to
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the same ELF file. */
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rwlock_wrlock (scn->elf->lock);
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/* The user is not required to pass a data descriptor for an extended
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section index table. */
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if (shndxdata_scn != NULL)
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{
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if (unlikely ((ndx + 1) * sizeof (Elf32_Word) > shndxdata_scn->d.d_size))
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{
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__libelf_seterrno (ELF_E_INVALID_INDEX);
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goto out;
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}
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shndx = &((Elf32_Word *) shndxdata_scn->d.d_buf)[ndx];
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}
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/* But if s/he does not the extended sectio index must be zero. */
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else if (unlikely (srcshndx != 0))
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{
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__libelf_seterrno (ELF_E_INVALID_INDEX);
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goto out;
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}
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if (scn->elf->class == ELFCLASS32)
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{
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Elf32_Sym *sym;
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/* There is the possibility that the values in the input are
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too large. */
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if (unlikely (src->st_value > 0xffffffffull)
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|| unlikely (src->st_size > 0xffffffffull))
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{
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__libelf_seterrno (ELF_E_INVALID_DATA);
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goto out;
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}
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/* Check whether we have to resize the data buffer. */
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if (INVALID_NDX (ndx, Elf32_Sym, &symdata_scn->d))
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{
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__libelf_seterrno (ELF_E_INVALID_INDEX);
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goto out;
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}
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sym = &((Elf32_Sym *) symdata_scn->d.d_buf)[ndx];
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#define COPY(name) \
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sym->name = src->name
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COPY (st_name);
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COPY (st_value);
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COPY (st_size);
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/* Please note that we can simply copy the `st_info' element since
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the definitions of ELFxx_ST_BIND and ELFxx_ST_TYPE are the same
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for the 64 bit variant. */
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COPY (st_info);
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COPY (st_other);
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COPY (st_shndx);
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}
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else
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{
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/* Check whether we have to resize the data buffer. */
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if (INVALID_NDX (ndx, Elf64_Sym, &symdata_scn->d))
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{
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__libelf_seterrno (ELF_E_INVALID_INDEX);
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goto out;
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}
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((Elf64_Sym *) symdata_scn->d.d_buf)[ndx] = *src;
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}
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/* Now we can store the section index. */
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if (shndx != NULL)
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*shndx = srcshndx;
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result = 1;
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/* Mark the section as modified. */
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scn->flags |= ELF_F_DIRTY;
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out:
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rwlock_unlock (scn->elf->lock);
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return result;
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}
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