src/gelf_update_sym.c

   1 /* Update symbol information in symbol table at the given index.
   2    Copyright (C) 2000, 2001, 2002 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 gelf_update_sym (data, ndx, src)
  43      Elf_Data *data;
  44      int ndx;
  45      GElf_Sym *src;
  46 {
  47   Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data;
  48   Elf_Scn *scn;
  49   int result = 0;
  50
  51   if (data == NULL)
  52     return 0;
  53
  54   if (unlikely (ndx < 0))
  55     {
  56       __libelf_seterrno (ELF_E_INVALID_INDEX);
  57       return 0;
  58     }
  59
  60   if (unlikely (data_scn->d.d_type != ELF_T_SYM))
  61     {
  62       /* The type of the data better should match.  */
  63       __libelf_seterrno (ELF_E_DATA_MISMATCH);
  64       return 0;
  65     }
  66
  67   scn = data_scn->s;
  68   rwlock_wrlock (scn->elf->lock);
  69
  70   if (scn->elf->class == ELFCLASS32)
  71     {
  72       Elf32_Sym *sym;
  73
  74       /* There is the possibility that the values in the input are
  75          too large.  */
  76       if (unlikely (src->st_value > 0xffffffffull)
  77           || unlikely (src->st_size > 0xffffffffull))
  78         {
  79           __libelf_seterrno (ELF_E_INVALID_DATA);
  80           goto out;
  81         }
  82
  83       /* Check whether we have to resize the data buffer.  */
  84       if (unlikely ((ndx + 1) * sizeof (Elf32_Sym) > data_scn->d.d_size))
  85         {
  86           __libelf_seterrno (ELF_E_INVALID_INDEX);
  87           goto out;
  88         }
  89
  90       sym = &((Elf32_Sym *) data_scn->d.d_buf)[ndx];
  91
  92 #define COPY(name) \
  93       sym->name = src->name
  94       COPY (st_name);
  95       COPY (st_value);
  96       COPY (st_size);
  97       /* Please note that we can simply copy the `st_info' element since
  98          the definitions of ELFxx_ST_BIND and ELFxx_ST_TYPE are the same
  99          for the 64 bit variant.  */
 100       COPY (st_info);
 101       COPY (st_other);
 102       COPY (st_shndx);
 103     }
 104   else
 105     {
 106       /* Check whether we have to resize the data buffer.  */
 107       if (unlikely ((ndx + 1) * sizeof (Elf64_Sym) > data_scn->d.d_size))
 108         {
 109           __libelf_seterrno (ELF_E_INVALID_INDEX);
 110           goto out;
 111         }
 112
 113       ((Elf64_Sym *) data_scn->d.d_buf)[ndx] = *src;
 114     }
 115
 116   result = 1;
 117
 118   /* Mark the section as modified.  */
 119   scn->flags |= ELF_F_DIRTY;
 120
 121  out:
 122   rwlock_unlock (scn->elf->lock);
 123
 124   return result;
 125 }