Branch data     Line data    Source code

       1                 :            : /* Update symbol information and section index in symbol table at the
       2                 :            :    given index.
       3                 :            :    Copyright (C) 2000, 2001, 2002, 2005, 2009, 2014, 2015 Red Hat, Inc.
       4                 :            :    This file is part of elfutils.
       5                 :            :    Written by Ulrich Drepper <drepper@redhat.com>, 2000.
       6                 :            : 
       7                 :            :    This file is free software; you can redistribute it and/or modify
       8                 :            :    it under the terms of either
       9                 :            : 
      10                 :            :      * the GNU Lesser General Public License as published by the Free
      11                 :            :        Software Foundation; either version 3 of the License, or (at
      12                 :            :        your option) any later version
      13                 :            : 
      14                 :            :    or
      15                 :            : 
      16                 :            :      * the GNU General Public License as published by the Free
      17                 :            :        Software Foundation; either version 2 of the License, or (at
      18                 :            :        your option) any later version
      19                 :            : 
      20                 :            :    or both in parallel, as here.
      21                 :            : 
      22                 :            :    elfutils is distributed in the hope that it will be useful, but
      23                 :            :    WITHOUT ANY WARRANTY; without even the implied warranty of
      24                 :            :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      25                 :            :    General Public License for more details.
      26                 :            : 
      27                 :            :    You should have received copies of the GNU General Public License and
      28                 :            :    the GNU Lesser General Public License along with this program.  If
      29                 :            :    not, see <http://www.gnu.org/licenses/>.  */
      30                 :            : 
      31                 :            : #ifdef HAVE_CONFIG_H
      32                 :            : # include <config.h>
      33                 :            : #endif
      34                 :            : 
      35                 :            : #include <gelf.h>
      36                 :            : #include <stdlib.h>
      37                 :            : #include <string.h>
      38                 :            : 
      39                 :            : #include "libelfP.h"
      40                 :            : 
      41                 :            : 
      42                 :            : int
      43                 :       3718 : gelf_update_symshndx (Elf_Data *symdata, Elf_Data *shndxdata, int ndx,
      44                 :            :                       GElf_Sym *src, Elf32_Word srcshndx)
      45                 :            : {
      46                 :       3718 :   Elf_Data_Scn *symdata_scn = (Elf_Data_Scn *) symdata;
      47                 :       3718 :   Elf_Data_Scn *shndxdata_scn = (Elf_Data_Scn *) shndxdata;
      48                 :       3718 :   Elf_Scn *scn;
      49                 :       3718 :   Elf32_Word *shndx = NULL;
      50                 :       3718 :   int result = 0;
      51                 :            : 
      52         [ -  + ]:       3718 :   if (symdata == NULL)
      53                 :            :     return 0;
      54                 :            : 
      55         [ -  + ]:       3718 :   if (unlikely (symdata_scn->d.d_type != ELF_T_SYM))
      56                 :            :     {
      57                 :            :       /* The type of the data better should match.  */
      58                 :          0 :       __libelf_seterrno (ELF_E_DATA_MISMATCH);
      59                 :          0 :       return 0;
      60                 :            :     }
      61                 :            : 
      62                 :       3718 :   scn = symdata_scn->s;
      63                 :            :   /* We simply have to believe the user that the two sections belong to
      64                 :            :      the same ELF file.  */
      65                 :       3718 :   rwlock_wrlock (scn->elf->lock);
      66                 :            : 
      67                 :            :   /* The user is not required to pass a data descriptor for an extended
      68                 :            :      section index table.  */
      69         [ -  + ]:       3718 :   if (shndxdata_scn != NULL)
      70                 :            :     {
      71         [ #  # ]:          0 :       if (unlikely ((ndx + 1) * sizeof (Elf32_Word) > shndxdata_scn->d.d_size))
      72                 :            :         {
      73                 :          0 :           __libelf_seterrno (ELF_E_INVALID_INDEX);
      74                 :          0 :           goto out;
      75                 :            :         }
      76                 :            : 
      77                 :          0 :       shndx = &((Elf32_Word *) shndxdata_scn->d.d_buf)[ndx];
      78                 :            :     }
      79                 :            :   /* But if s/he does not the extended sectio index must be zero.  */
      80         [ -  + ]:       3718 :   else if (unlikely (srcshndx != 0))
      81                 :            :     {
      82                 :          0 :       __libelf_seterrno (ELF_E_INVALID_INDEX);
      83                 :          0 :       goto out;
      84                 :            :     }
      85                 :            : 
      86         [ +  + ]:       3718 :   if (scn->elf->class == ELFCLASS32)
      87                 :            :     {
      88                 :       1267 :       Elf32_Sym *sym;
      89                 :            : 
      90                 :            :       /* There is the possibility that the values in the input are
      91                 :            :          too large.  */
      92         [ +  - ]:       1267 :       if (unlikely (src->st_value > 0xffffffffull)
      93         [ -  + ]:       1267 :           || unlikely (src->st_size > 0xffffffffull))
      94                 :            :         {
      95                 :          0 :           __libelf_seterrno (ELF_E_INVALID_DATA);
      96                 :          0 :           goto out;
      97                 :            :         }
      98                 :            : 
      99                 :            :       /* Check whether we have to resize the data buffer.  */
     100         [ -  + ]:       1267 :       if (INVALID_NDX (ndx, Elf32_Sym, &symdata_scn->d))
     101                 :            :         {
     102                 :          0 :           __libelf_seterrno (ELF_E_INVALID_INDEX);
     103                 :          0 :           goto out;
     104                 :            :         }
     105                 :            : 
     106                 :       1267 :       sym = &((Elf32_Sym *) symdata_scn->d.d_buf)[ndx];
     107                 :            : 
     108                 :            : #define COPY(name) \
     109                 :            :       sym->name = src->name
     110                 :       1267 :       COPY (st_name);
     111                 :       1267 :       COPY (st_value);
     112                 :       1267 :       COPY (st_size);
     113                 :            :       /* Please note that we can simply copy the `st_info' element since
     114                 :            :          the definitions of ELFxx_ST_BIND and ELFxx_ST_TYPE are the same
     115                 :            :          for the 64 bit variant.  */
     116                 :       1267 :       COPY (st_info);
     117                 :       1267 :       COPY (st_other);
     118                 :       1267 :       COPY (st_shndx);
     119                 :            :     }
     120                 :            :   else
     121                 :            :     {
     122                 :            :       /* Check whether we have to resize the data buffer.  */
     123         [ -  + ]:       2451 :       if (INVALID_NDX (ndx, Elf64_Sym, &symdata_scn->d))
     124                 :            :         {
     125                 :          0 :           __libelf_seterrno (ELF_E_INVALID_INDEX);
     126                 :          0 :           goto out;
     127                 :            :         }
     128                 :            : 
     129                 :       2451 :       ((Elf64_Sym *) symdata_scn->d.d_buf)[ndx] = *src;
     130                 :            :     }
     131                 :            : 
     132                 :            :   /* Now we can store the section index.  */
     133         [ -  + ]:       3718 :   if (shndx != NULL)
     134                 :          0 :     *shndx = srcshndx;
     135                 :            : 
     136                 :       3718 :   result = 1;
     137                 :            : 
     138                 :            :   /* Mark the section as modified.  */
     139                 :       3718 :   scn->flags |= ELF_F_DIRTY;
     140                 :            : 
     141                 :       3718 :  out:
     142                 :       3718 :   rwlock_unlock (scn->elf->lock);
     143                 :            : 
     144                 :       3718 :   return result;
     145                 :            : }