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      1 /* Update information in dynamic table at the given index.
      2    Copyright (C) 2007 Red Hat, Inc.
      3    This file is part of Red Hat elfutils.
      4 
      5    Red Hat elfutils is free software; you can redistribute it and/or modify
      6    it under the terms of the GNU General Public License as published by the
      7    Free Software Foundation; version 2 of the License.
      8 
      9    Red Hat elfutils is distributed in the hope that it will be useful, but
     10    WITHOUT ANY WARRANTY; without even the implied warranty of
     11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     12    General Public License for more details.
     13 
     14    You should have received a copy of the GNU General Public License along
     15    with Red Hat elfutils; if not, write to the Free Software Foundation,
     16    Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
     17 
     18    In addition, as a special exception, Red Hat, Inc. gives You the
     19    additional right to link the code of Red Hat elfutils with code licensed
     20    under any Open Source Initiative certified open source license
     21    (http://www.opensource.org/licenses/index.php) which requires the
     22    distribution of source code with any binary distribution and to
     23    distribute linked combinations of the two.  Non-GPL Code permitted under
     24    this exception must only link to the code of Red Hat elfutils through
     25    those well defined interfaces identified in the file named EXCEPTION
     26    found in the source code files (the "Approved Interfaces").  The files
     27    of Non-GPL Code may instantiate templates or use macros or inline
     28    functions from the Approved Interfaces without causing the resulting
     29    work to be covered by the GNU General Public License.  Only Red Hat,
     30    Inc. may make changes or additions to the list of Approved Interfaces.
     31    Red Hat's grant of this exception is conditioned upon your not adding
     32    any new exceptions.  If you wish to add a new Approved Interface or
     33    exception, please contact Red Hat.  You must obey the GNU General Public
     34    License in all respects for all of the Red Hat elfutils code and other
     35    code used in conjunction with Red Hat elfutils except the Non-GPL Code
     36    covered by this exception.  If you modify this file, you may extend this
     37    exception to your version of the file, but you are not obligated to do
     38    so.  If you do not wish to provide this exception without modification,
     39    you must delete this exception statement from your version and license
     40    this file solely under the GPL without exception.
     41 
     42    Red Hat elfutils is an included package of the Open Invention Network.
     43    An included package of the Open Invention Network is a package for which
     44    Open Invention Network licensees cross-license their patents.  No patent
     45    license is granted, either expressly or impliedly, by designation as an
     46    included package.  Should you wish to participate in the Open Invention
     47    Network licensing program, please visit www.openinventionnetwork.com
     48    <http://www.openinventionnetwork.com>.  */
     49 
     50 #ifdef HAVE_CONFIG_H
     51 # include <config.h>
     52 #endif
     53 
     54 #include <gelf.h>
     55 #include <string.h>
     56 
     57 #include "libelfP.h"
     58 
     59 
     60 int
     61 gelf_update_auxv (data, ndx, src)
     62      Elf_Data *data;
     63      int ndx;
     64      GElf_auxv_t *src;
     65 {
     66   Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data;
     67   Elf_Scn *scn;
     68   int result = 0;
     69 
     70   if (data == NULL)
     71     return 0;
     72 
     73   if (unlikely (ndx < 0))
     74     {
     75       __libelf_seterrno (ELF_E_INVALID_INDEX);
     76       return 0;
     77     }
     78 
     79   if (unlikely (data_scn->d.d_type != ELF_T_AUXV))
     80     {
     81       /* The type of the data better should match.  */
     82       __libelf_seterrno (ELF_E_DATA_MISMATCH);
     83       return 0;
     84     }
     85 
     86   scn = data_scn->s;
     87   rwlock_wrlock (scn->elf->lock);
     88 
     89   if (scn->elf->class == ELFCLASS32)
     90     {
     91       Elf32_auxv_t *auxv;
     92 
     93       /* There is the possibility that the values in the input are
     94 	 too large.  */
     95       if (unlikely (src->a_type > 0xffffffffll)
     96 	  || unlikely (src->a_un.a_val > 0xffffffffull))
     97 	{
     98 	  __libelf_seterrno (ELF_E_INVALID_DATA);
     99 	  goto out;
    100 	}
    101 
    102       /* Check whether we have to resize the data buffer.  */
    103       if (unlikely ((ndx + 1) * sizeof (Elf32_auxv_t) > data_scn->d.d_size))
    104 	{
    105 	  __libelf_seterrno (ELF_E_INVALID_INDEX);
    106 	  goto out;
    107 	}
    108 
    109       auxv = &((Elf32_auxv_t *) data_scn->d.d_buf)[ndx];
    110 
    111       auxv->a_type = src->a_type;
    112       auxv->a_un.a_val = src->a_un.a_val;
    113     }
    114   else
    115     {
    116       /* Check whether we have to resize the data buffer.  */
    117       if (unlikely ((ndx + 1) * sizeof (Elf64_auxv_t) > data_scn->d.d_size))
    118 	{
    119 	  __libelf_seterrno (ELF_E_INVALID_INDEX);
    120 	  goto out;
    121 	}
    122 
    123       ((Elf64_auxv_t *) data_scn->d.d_buf)[ndx] = *src;
    124     }
    125 
    126   result = 1;
    127 
    128   /* Mark the section as modified.  */
    129   scn->flags |= ELF_F_DIRTY;
    130 
    131  out:
    132   rwlock_unlock (scn->elf->lock);
    133 
    134   return result;
    135 }
    136