Line data    Source code

       1             : /* Update section header.
       2             :    Copyright (C) 2000, 2001, 2002, 2010 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 <string.h>
      36             : 
      37             : #include "libelfP.h"
      38             : 
      39             : 
      40             : int
      41     2990978 : gelf_update_shdr (Elf_Scn *scn, GElf_Shdr *src)
      42             : {
      43     2990978 :   int result = 0;
      44     2990978 :   Elf *elf;
      45             : 
      46     2990978 :   if (scn == NULL || src == NULL)
      47             :     return 0;
      48             : 
      49     2990978 :   elf = scn->elf;
      50     2990978 :   rwlock_wrlock (elf->lock);
      51             : 
      52     2990978 :   if (elf->class == ELFCLASS32)
      53             :     {
      54     3731310 :       Elf32_Shdr *shdr
      55     1865655 :         = scn->shdr.e32 ?: __elf32_getshdr_wrlock (scn);
      56             : 
      57     1865655 :       if (shdr == NULL)
      58             :         {
      59           0 :           __libelf_seterrno (ELF_E_INVALID_OPERAND);
      60           0 :           goto out;
      61             :         }
      62             : 
      63     1865655 :       if (unlikely (src->sh_flags > 0xffffffffull)
      64     1865655 :           || unlikely (src->sh_addr > 0xffffffffull)
      65     1865655 :           || unlikely (src->sh_offset > 0xffffffffull)
      66     1865655 :           || unlikely (src->sh_size > 0xffffffffull)
      67     1865655 :           || unlikely (src->sh_addralign > 0xffffffffull)
      68     1865655 :           || unlikely (src->sh_entsize > 0xffffffffull))
      69             :         {
      70           0 :           __libelf_seterrno (ELF_E_INVALID_DATA);
      71           0 :           goto out;
      72             :         }
      73             : 
      74             : #define COPY(name) \
      75             :       shdr->name = src->name
      76     1865655 :       COPY (sh_name);
      77     1865655 :       COPY (sh_type);
      78     1865655 :       COPY (sh_flags);
      79     1865655 :       COPY (sh_addr);
      80     1865655 :       COPY (sh_offset);
      81     1865655 :       COPY (sh_size);
      82     1865655 :       COPY (sh_link);
      83     1865655 :       COPY (sh_info);
      84     1865655 :       COPY (sh_addralign);
      85     1865655 :       COPY (sh_entsize);
      86             :     }
      87             :   else
      88             :     {
      89     2250646 :       Elf64_Shdr *shdr
      90     1125323 :         = scn->shdr.e64 ?: __elf64_getshdr_wrlock (scn);
      91             : 
      92     1125323 :       if (shdr == NULL)
      93             :         {
      94           0 :           __libelf_seterrno (ELF_E_INVALID_OPERAND);
      95           0 :           goto out;
      96             :         }
      97             : 
      98             :       /* We only have to copy the data.  */
      99     1125323 :       (void) memcpy (shdr, src, sizeof (GElf_Shdr));
     100             :     }
     101             : 
     102             :   /* Mark the section header as modified.  */
     103     2990978 :   scn->shdr_flags |= ELF_F_DIRTY;
     104             : 
     105     2990978 :   result = 1;
     106             : 
     107             :  out:
     108             :   rwlock_unlock (elf->lock);
     109             : 
     110             :   return result;
     111             : }