Line data    Source code

       1             : /* Get additional required symbol version information at the given offset.
       2             :    Copyright (C) 1999, 2000, 2001, 2002, 2015 Red Hat, Inc.
       3             :    This file is part of elfutils.
       4             :    Written by Ulrich Drepper <drepper@redhat.com>, 1999.
       5             : 
       6             :    This file is free software; you can redistribute it and/or modify
       7             :    it under the terms of either
       8             : 
       9             :      * the GNU Lesser General Public License as published by the Free
      10             :        Software Foundation; either version 3 of the License, or (at
      11             :        your option) any later version
      12             : 
      13             :    or
      14             : 
      15             :      * the GNU General Public License as published by the Free
      16             :        Software Foundation; either version 2 of the License, or (at
      17             :        your option) any later version
      18             : 
      19             :    or both in parallel, as here.
      20             : 
      21             :    elfutils is distributed in the hope that it will be useful, but
      22             :    WITHOUT ANY WARRANTY; without even the implied warranty of
      23             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      24             :    General Public License for more details.
      25             : 
      26             :    You should have received copies of the GNU General Public License and
      27             :    the GNU Lesser General Public License along with this program.  If
      28             :    not, see <http://www.gnu.org/licenses/>.  */
      29             : 
      30             : #ifdef HAVE_CONFIG_H
      31             : # include <config.h>
      32             : #endif
      33             : 
      34             : #include <assert.h>
      35             : #include <gelf.h>
      36             : #include <string.h>
      37             : 
      38             : #include "libelfP.h"
      39             : 
      40             : 
      41             : GElf_Vernaux *
      42        7153 : gelf_getvernaux (Elf_Data *data, int offset, GElf_Vernaux *dst)
      43             : {
      44             :   GElf_Vernaux *result;
      45             : 
      46        7153 :   if (data == NULL)
      47             :     return NULL;
      48             : 
      49        7153 :   if (unlikely (data->d_type != ELF_T_VNEED))
      50             :     {
      51           0 :       __libelf_seterrno (ELF_E_INVALID_HANDLE);
      52           0 :       return NULL;
      53             :     }
      54             : 
      55             :   /* It's easy to handle this type.  It has the same size for 32 and
      56             :      64 bit objects.  And fortunately the `ElfXXX_Vernaux' records
      57             :      also have the same size.  */
      58             :   assert (sizeof (GElf_Vernaux) == sizeof (Elf32_Verneed));
      59             :   assert (sizeof (GElf_Vernaux) == sizeof (Elf64_Verneed));
      60             :   assert (sizeof (GElf_Vernaux) == sizeof (Elf32_Vernaux));
      61             :   assert (sizeof (GElf_Vernaux) == sizeof (Elf64_Vernaux));
      62             : 
      63             :   rwlock_rdlock (((Elf_Data_Scn *) data)->s->elf->lock);
      64             : 
      65             :   /* The data is already in the correct form.  Just make sure the
      66             :      index is OK.  */
      67        7153 :   if (unlikely (offset < 0)
      68        7153 :       || unlikely (offset + sizeof (GElf_Vernaux) > data->d_size)
      69        7153 :       || unlikely (offset % sizeof (GElf_Vernaux) != 0))
      70             :     {
      71           0 :       __libelf_seterrno (ELF_E_OFFSET_RANGE);
      72           0 :       result = NULL;
      73             :     }
      74             :   else
      75       14306 :     result = (GElf_Vernaux *) memcpy (dst, (char *) data->d_buf + offset,
      76             :                                       sizeof (GElf_Verneed));
      77             : 
      78             :   rwlock_unlock (((Elf_Data_Scn *) data)->s->elf->lock);
      79             : 
      80        7153 :   return result;
      81             : }