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/* Update ELF header.
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Copyright (C) 2000, 2001, 2002, 2010 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 <string.h>
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#include "libelfP.h"
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int
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gelf_update_ehdr (Elf *elf, GElf_Ehdr *src)
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{
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int result = 0;
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if (elf == NULL)
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return 0;
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if (unlikely (elf->kind != ELF_K_ELF))
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{
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__libelf_seterrno (ELF_E_INVALID_HANDLE);
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return 0;
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}
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rwlock_wrlock (elf->lock);
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if (elf->class == ELFCLASS32)
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{
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Elf32_Ehdr *ehdr = elf->state.elf32.ehdr;
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if (ehdr == NULL)
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{
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__libelf_seterrno (ELF_E_WRONG_ORDER_EHDR);
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goto out;
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}
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/* We have to convert the data to the 32 bit format. This might
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overflow some fields so we have to test for this case before
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copying. */
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if (unlikely (src->e_entry > 0xffffffffull)
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|| unlikely (src->e_phoff > 0xffffffffull)
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|| unlikely (src->e_shoff > 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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/* Copy the data. */
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memcpy (ehdr->e_ident, src->e_ident, EI_NIDENT);
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#define COPY(name) \
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ehdr->name = src->name
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COPY (e_type);
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COPY (e_machine);
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COPY (e_version);
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COPY (e_entry);
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COPY (e_phoff);
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COPY (e_shoff);
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COPY (e_flags);
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COPY (e_ehsize);
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COPY (e_phentsize);
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COPY (e_phnum);
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COPY (e_shentsize);
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COPY (e_shnum);
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COPY (e_shstrndx);
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}
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else
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{
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Elf64_Ehdr *ehdr = elf->state.elf64.ehdr;
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if (ehdr == NULL)
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{
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__libelf_seterrno (ELF_E_WRONG_ORDER_EHDR);
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goto out;
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}
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/* Just copy the data. */
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memcpy (ehdr, src, sizeof (Elf64_Ehdr));
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}
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/* Mark the ELF header as modified. */
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elf->state.elf.ehdr_flags |= ELF_F_DIRTY;
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result = 1;
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out:
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rwlock_unlock (elf->lock);
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return result;
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}
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