Line data    Source code

       1             : /* Update REL relocation information at given index.
       2             :    Copyright (C) 2000, 2001, 2002, 2005, 2009, 2014 Red Hat, Inc.
       3             :    This file is part of elfutils.
       4             :    Written by Ulrich Drepper <drepper@redhat.com>, 2000.
       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 <gelf.h>
      35             : #include <stdlib.h>
      36             : 
      37             : #include "libelfP.h"
      38             : 
      39             : 
      40             : int
      41       18786 : gelf_update_rel (Elf_Data *dst, int ndx, GElf_Rel *src)
      42             : {
      43       18786 :   Elf_Data_Scn *data_scn = (Elf_Data_Scn *) dst;
      44             :   Elf_Scn *scn;
      45       18786 :   int result = 0;
      46             : 
      47       18786 :   if (dst == NULL)
      48             :     return 0;
      49             : 
      50       18786 :   if (unlikely (data_scn->d.d_type != ELF_T_REL))
      51             :     {
      52             :       /* The type of the data better should match.  */
      53           0 :       __libelf_seterrno (ELF_E_DATA_MISMATCH);
      54           0 :       return 0;
      55             :     }
      56             : 
      57       18786 :   scn = data_scn->s;
      58       18786 :   rwlock_wrlock (scn->elf->lock);
      59             : 
      60       18786 :   if (scn->elf->class == ELFCLASS32)
      61             :     {
      62             :       Elf32_Rel *rel;
      63             : 
      64             :       /* There is the possibility that the values in the input are
      65             :          too large.  */
      66       18786 :       if (unlikely (src->r_offset > 0xffffffffull)
      67       18786 :           || unlikely (GELF_R_SYM (src->r_info) > 0xffffff)
      68       18786 :           || unlikely (GELF_R_TYPE (src->r_info) > 0xff))
      69             :         {
      70           0 :           __libelf_seterrno (ELF_E_INVALID_DATA);
      71           0 :           goto out;
      72             :         }
      73             : 
      74             :       /* Check whether we have to resize the data buffer.  */
      75       18786 :       if (INVALID_NDX (ndx, Elf32_Rel, &data_scn->d))
      76             :         {
      77           0 :           __libelf_seterrno (ELF_E_INVALID_INDEX);
      78           0 :           goto out;
      79             :         }
      80             : 
      81       18786 :       rel = &((Elf32_Rel *) data_scn->d.d_buf)[ndx];
      82             : 
      83       18786 :       rel->r_offset = src->r_offset;
      84       18786 :       rel->r_info = ELF32_R_INFO (GELF_R_SYM (src->r_info),
      85             :                                   GELF_R_TYPE (src->r_info));
      86             :     }
      87             :   else
      88             :     {
      89             :       /* Check whether we have to resize the data buffer.  */
      90           0 :       if (INVALID_NDX (ndx, Elf64_Rel, &data_scn->d))
      91             :         {
      92           0 :           __libelf_seterrno (ELF_E_INVALID_INDEX);
      93           0 :           goto out;
      94             :         }
      95             : 
      96           0 :       ((Elf64_Rel *) data_scn->d.d_buf)[ndx] = *src;
      97             :     }
      98             : 
      99       18786 :   result = 1;
     100             : 
     101             :   /* Mark the section as modified.  */
     102       18786 :   scn->flags |= ELF_F_DIRTY;
     103             : 
     104       18786 :  out:
     105             :   rwlock_unlock (scn->elf->lock);
     106             : 
     107       18786 :   return result;
     108             : }