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       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                 :       7582 : gelf_getvernaux (Elf_Data *data, int offset, GElf_Vernaux *dst)
      43                 :            : {
      44                 :       7582 :   GElf_Vernaux *result;
      45                 :            : 
      46         [ +  - ]:       7582 :   if (data == NULL)
      47                 :            :     return NULL;
      48                 :            : 
      49         [ -  + ]:       7582 :   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                 :       7582 :   assert (sizeof (GElf_Vernaux) == sizeof (Elf32_Verneed));
      59                 :       7582 :   assert (sizeof (GElf_Vernaux) == sizeof (Elf64_Verneed));
      60                 :       7582 :   assert (sizeof (GElf_Vernaux) == sizeof (Elf32_Vernaux));
      61                 :       7582 :   assert (sizeof (GElf_Vernaux) == sizeof (Elf64_Vernaux));
      62                 :            : 
      63                 :       7582 :   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         [ +  - ]:       7582 :   if (unlikely (offset < 0)
      68         [ +  - ]:       7582 :       || unlikely (offset + sizeof (GElf_Vernaux) > data->d_size)
      69         [ -  + ]:       7582 :       || unlikely (offset % sizeof (GElf_Vernaux) != 0))
      70                 :            :     {
      71                 :          0 :       __libelf_seterrno (ELF_E_OFFSET_RANGE);
      72                 :          0 :       result = NULL;
      73                 :            :     }
      74                 :            :   else
      75                 :      15164 :     result = (GElf_Vernaux *) memcpy (dst, (char *) data->d_buf + offset,
      76                 :            :                                       sizeof (GElf_Verneed));
      77                 :            : 
      78                 :       7582 :   rwlock_unlock (((Elf_Data_Scn *) data)->s->elf->lock);
      79                 :            : 
      80                 :       7582 :   return result;
      81                 :            : }