LCOV - code coverage report
Current view: top level - elfutils/libelf - gelf_getnote.c (source / functions) Hit Total Coverage
Test: lcov.out Lines: 18 20 90.0 %
Date: 2013-03-08 Functions: 1 1 100.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 6 10 60.0 %

           Branch data     Line data    Source code
       1                 :            : /* Get note information at the supplied offset.
       2                 :            :    Copyright (C) 2007 Red Hat, Inc.
       3                 :            :    This file is part of elfutils.
       4                 :            : 
       5                 :            :    This file is free software; you can redistribute it and/or modify
       6                 :            :    it under the terms of either
       7                 :            : 
       8                 :            :      * the GNU Lesser General Public License as published by the Free
       9                 :            :        Software Foundation; either version 3 of the License, or (at
      10                 :            :        your option) any later version
      11                 :            : 
      12                 :            :    or
      13                 :            : 
      14                 :            :      * the GNU General Public License as published by the Free
      15                 :            :        Software Foundation; either version 2 of the License, or (at
      16                 :            :        your option) any later version
      17                 :            : 
      18                 :            :    or both in parallel, as here.
      19                 :            : 
      20                 :            :    elfutils is distributed in the hope that it will be useful, but
      21                 :            :    WITHOUT ANY WARRANTY; without even the implied warranty of
      22                 :            :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      23                 :            :    General Public License for more details.
      24                 :            : 
      25                 :            :    You should have received copies of the GNU General Public License and
      26                 :            :    the GNU Lesser General Public License along with this program.  If
      27                 :            :    not, see <http://www.gnu.org/licenses/>.  */
      28                 :            : 
      29                 :            : #ifdef HAVE_CONFIG_H
      30                 :            : # include <config.h>
      31                 :            : #endif
      32                 :            : 
      33                 :            : #include <assert.h>
      34                 :            : #include <gelf.h>
      35                 :            : #include <string.h>
      36                 :            : 
      37                 :            : #include "libelfP.h"
      38                 :            : 
      39                 :            : size_t
      40                 :        347 : gelf_getnote (data, offset, result, name_offset, desc_offset)
      41                 :            :      Elf_Data *data;
      42                 :            :      size_t offset;
      43                 :            :      GElf_Nhdr *result;
      44                 :            :      size_t *name_offset;
      45                 :            :      size_t *desc_offset;
      46                 :            : {
      47         [ +  - ]:        347 :   if (data == NULL)
      48                 :            :     return 0;
      49                 :            : 
      50         [ -  + ]:        347 :   if (unlikely (data->d_type != ELF_T_NHDR))
      51                 :            :     {
      52                 :          0 :       __libelf_seterrno (ELF_E_INVALID_HANDLE);
      53                 :          0 :       return 0;
      54                 :            :     }
      55                 :            : 
      56                 :            :   /* It's easy to handle this type.  It has the same size for 32 and
      57                 :            :      64 bit objects.  */
      58                 :            :   assert (sizeof (GElf_Nhdr) == sizeof (Elf32_Nhdr));
      59                 :            :   assert (sizeof (GElf_Nhdr) == sizeof (Elf64_Nhdr));
      60                 :            : 
      61                 :            :   rwlock_rdlock (((Elf_Data_Scn *) data)->s->elf->lock);
      62                 :            : 
      63                 :            :   /* The data is already in the correct form.  Just make sure the
      64                 :            :      offset is OK.  */
      65         [ +  + ]:        347 :   if (unlikely (offset + sizeof (GElf_Nhdr) > data->d_size))
      66                 :            :     {
      67                 :         26 :       __libelf_seterrno (ELF_E_OFFSET_RANGE);
      68                 :         26 :       offset = 0;
      69                 :            :     }
      70                 :            :   else
      71                 :            :     {
      72                 :        321 :       const GElf_Nhdr *n = data->d_buf + offset;
      73                 :        321 :       offset += sizeof *n;
      74                 :            : 
      75                 :        321 :       GElf_Word namesz = NOTE_ALIGN (n->n_namesz);
      76                 :        321 :       GElf_Word descsz = NOTE_ALIGN (n->n_descsz);
      77                 :            : 
      78         [ +  - ]:        321 :       if (unlikely (data->d_size - offset < namesz))
      79                 :            :         offset = 0;
      80                 :            :       else
      81                 :            :         {
      82                 :        321 :           *name_offset = offset;
      83                 :        321 :           offset += namesz;
      84         [ +  - ]:        321 :           if (unlikely (data->d_size - offset < descsz))
      85                 :            :             offset = 0;
      86                 :            :           else
      87                 :            :             {
      88                 :        321 :               *desc_offset = offset;
      89                 :        321 :               offset += descsz;
      90                 :        321 :               *result = *n;
      91                 :            :             }
      92                 :            :         }
      93                 :            :     }
      94                 :            : 
      95                 :            :   rwlock_unlock (((Elf_Data_Scn *) data)->s->elf->lock);
      96                 :            : 
      97                 :        347 :   return offset;
      98                 :            : }

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