Line data    Source code

       1             : /* Update symbol information in symbol table at the given index.
       2             :    Copyright (C) 2000, 2001, 2002, 2005, 2009, 2014, 2015 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             : #include <string.h>
      37             : 
      38             : #include "libelfP.h"
      39             : 
      40             : 
      41             : int
      42       91601 : gelf_update_sym (Elf_Data *data, int ndx, GElf_Sym *src)
      43             : {
      44       91601 :   Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data;
      45       91601 :   Elf_Scn *scn;
      46       91601 :   int result = 0;
      47             : 
      48       91601 :   if (data == NULL)
      49             :     return 0;
      50             : 
      51       91601 :   if (unlikely (data_scn->d.d_type != ELF_T_SYM))
      52             :     {
      53             :       /* The type of the data better should match.  */
      54           0 :       __libelf_seterrno (ELF_E_DATA_MISMATCH);
      55           0 :       return 0;
      56             :     }
      57             : 
      58       91601 :   scn = data_scn->s;
      59       91601 :   rwlock_wrlock (scn->elf->lock);
      60             : 
      61       91601 :   if (scn->elf->class == ELFCLASS32)
      62             :     {
      63       89800 :       Elf32_Sym *sym;
      64             : 
      65             :       /* There is the possibility that the values in the input are
      66             :          too large.  */
      67       89800 :       if (unlikely (src->st_value > 0xffffffffull)
      68       89800 :           || unlikely (src->st_size > 0xffffffffull))
      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       89800 :       if (INVALID_NDX (ndx, Elf32_Sym, &data_scn->d))
      76             :         {
      77           0 :           __libelf_seterrno (ELF_E_INVALID_INDEX);
      78           0 :           goto out;
      79             :         }
      80             : 
      81       89800 :       sym = &((Elf32_Sym *) data_scn->d.d_buf)[ndx];
      82             : 
      83             : #define COPY(name) \
      84             :       sym->name = src->name
      85       89800 :       COPY (st_name);
      86       89800 :       COPY (st_value);
      87       89800 :       COPY (st_size);
      88             :       /* Please note that we can simply copy the `st_info' element since
      89             :          the definitions of ELFxx_ST_BIND and ELFxx_ST_TYPE are the same
      90             :          for the 64 bit variant.  */
      91       89800 :       COPY (st_info);
      92       89800 :       COPY (st_other);
      93       89800 :       COPY (st_shndx);
      94             :     }
      95             :   else
      96             :     {
      97             :       /* Check whether we have to resize the data buffer.  */
      98        1801 :       if (INVALID_NDX (ndx, Elf64_Sym, &data_scn->d))
      99             :         {
     100           0 :           __libelf_seterrno (ELF_E_INVALID_INDEX);
     101           0 :           goto out;
     102             :         }
     103             : 
     104        1801 :       ((Elf64_Sym *) data_scn->d.d_buf)[ndx] = *src;
     105             :     }
     106             : 
     107       91601 :   result = 1;
     108             : 
     109             :   /* Mark the section as modified.  */
     110       91601 :   scn->flags |= ELF_F_DIRTY;
     111             : 
     112       91601 :  out:
     113       91601 :   rwlock_unlock (scn->elf->lock);
     114             : 
     115       91601 :   return result;
     116             : }