Branch data     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                 :      92115 : gelf_update_sym (Elf_Data *data, int ndx, GElf_Sym *src)
      43                 :            : {
      44                 :      92115 :   Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data;
      45                 :      92115 :   Elf_Scn *scn;
      46                 :      92115 :   int result = 0;
      47                 :            : 
      48         [ -  + ]:      92115 :   if (data == NULL)
      49                 :            :     return 0;
      50                 :            : 
      51         [ -  + ]:      92115 :   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                 :      92115 :   scn = data_scn->s;
      59                 :      92115 :   rwlock_wrlock (scn->elf->lock);
      60                 :            : 
      61         [ +  + ]:      92115 :   if (scn->elf->class == ELFCLASS32)
      62                 :            :     {
      63                 :      90185 :       Elf32_Sym *sym;
      64                 :            : 
      65                 :            :       /* There is the possibility that the values in the input are
      66                 :            :          too large.  */
      67         [ +  - ]:      90185 :       if (unlikely (src->st_value > 0xffffffffull)
      68         [ -  + ]:      90185 :           || 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         [ -  + ]:      90185 :       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                 :      90185 :       sym = &((Elf32_Sym *) data_scn->d.d_buf)[ndx];
      82                 :            : 
      83                 :            : #define COPY(name) \
      84                 :            :       sym->name = src->name
      85                 :      90185 :       COPY (st_name);
      86                 :      90185 :       COPY (st_value);
      87                 :      90185 :       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                 :      90185 :       COPY (st_info);
      92                 :      90185 :       COPY (st_other);
      93                 :      90185 :       COPY (st_shndx);
      94                 :            :     }
      95                 :            :   else
      96                 :            :     {
      97                 :            :       /* Check whether we have to resize the data buffer.  */
      98         [ -  + ]:       1930 :       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                 :       1930 :       ((Elf64_Sym *) data_scn->d.d_buf)[ndx] = *src;
     105                 :            :     }
     106                 :            : 
     107                 :      92115 :   result = 1;
     108                 :            : 
     109                 :            :   /* Mark the section as modified.  */
     110                 :      92115 :   scn->flags |= ELF_F_DIRTY;
     111                 :            : 
     112                 :      92115 :  out:
     113                 :      92115 :   rwlock_unlock (scn->elf->lock);
     114                 :            : 
     115                 :      92115 :   return result;
     116                 :            : }