libelf/gelf_update_shdr.c

/* Update section header.
   Copyright (C) 2000, 2001, 2002 Red Hat, Inc.
   This file is part of Red Hat elfutils.
   Written by Ulrich Drepper <drepper@redhat.com>, 2000.

   Red Hat elfutils is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by the
   Free Software Foundation; version 2 of the License.

   Red Hat elfutils is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License along
   with Red Hat elfutils; if not, write to the Free Software Foundation,
   Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.

   In addition, as a special exception, Red Hat, Inc. gives You the
   additional right to link the code of Red Hat elfutils with code licensed
   under any Open Source Initiative certified open source license
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   found in the source code files (the "Approved Interfaces").  The files
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   this file solely under the GPL without exception.

   Red Hat elfutils is an included package of the Open Invention Network.
   An included package of the Open Invention Network is a package for which
   Open Invention Network licensees cross-license their patents.  No patent
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#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <gelf.h>
#include <string.h>

#include "libelfP.h"


int
gelf_update_shdr (Elf_Scn *scn, GElf_Shdr *src)
{
  int result = 0;
  Elf *elf;

  if (scn == NULL || src == NULL)
    return 0;

  elf = scn->elf;
  rwlock_wrlock (elf->lock);

  if (elf->class == ELFCLASS32)
    {
      Elf32_Shdr *shdr
	= scn->shdr.e32 ?: __elf32_getshdr_wrlock (scn);

      if (shdr == NULL)
	{
	  __libelf_seterrno (ELF_E_INVALID_OPERAND);
	  goto out;
	}

      if (unlikely (src->sh_flags > 0xffffffffull)
	  || unlikely (src->sh_addr > 0xffffffffull)
	  || unlikely (src->sh_offset > 0xffffffffull)
	  || unlikely (src->sh_size > 0xffffffffull)
	  || unlikely (src->sh_addralign > 0xffffffffull)
	  || unlikely (src->sh_entsize > 0xffffffffull))
	{
	  __libelf_seterrno (ELF_E_INVALID_DATA);
	  goto out;
	}

#define COPY(name) \
      shdr->name = src->name
      COPY (sh_name);
      COPY (sh_type);
      COPY (sh_flags);
      COPY (sh_addr);
      COPY (sh_offset);
      COPY (sh_size);
      COPY (sh_link);
      COPY (sh_info);
      COPY (sh_addralign);
      COPY (sh_entsize);
    }
  else
    {
      Elf64_Shdr *shdr
	= scn->shdr.e64 ?: __elf64_getshdr_wrlock (scn);

      if (shdr == NULL)
	{
	  __libelf_seterrno (ELF_E_INVALID_OPERAND);
	  goto out;
	}

      /* We only have to copy the data.  */
      (void) memcpy (shdr, src, sizeof (GElf_Shdr));
    }

  result = 1;

 out:
  rwlock_unlock (elf->lock);

  return result;
}