Line data    Source code

       1             : /* Creates an ELF handle from a possibly compressed file descriptor.
       2             :    Copyright (C) 2018 Red Hat, Inc.
       3             :    This file is part of elfutils.
       4             : 
       5             :    This file is free software; you can redistribute it and/or modify
       6             :    it under the terms of either
       7             : 
       8             :      * the GNU Lesser General Public License as published by the Free
       9             :        Software Foundation; either version 3 of the License, or (at
      10             :        your option) any later version
      11             : 
      12             :    or
      13             : 
      14             :      * the GNU General Public License as published by the Free
      15             :        Software Foundation; either version 2 of the License, or (at
      16             :        your option) any later version
      17             : 
      18             :    or both in parallel, as here.
      19             : 
      20             :    elfutils is distributed in the hope that it will be useful, but
      21             :    WITHOUT ANY WARRANTY; without even the implied warranty of
      22             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      23             :    General Public License for more details.
      24             : 
      25             :    You should have received copies of the GNU General Public License and
      26             :    the GNU Lesser General Public License along with this program.  If
      27             :    not, see <http://www.gnu.org/licenses/>.  */
      28             : 
      29             : #ifdef HAVE_CONFIG_H
      30             : # include <config.h>
      31             : #endif
      32             : 
      33             : #include "libdwelfP.h"
      34             : #include "libdwflP.h"
      35             : #include "libelfP.h"
      36             : 
      37             : #include <unistd.h>
      38             : 
      39             : Elf *
      40          69 : dwelf_elf_begin (int fd)
      41             : {
      42          69 :   Elf *elf = NULL;
      43          69 :   Dwfl_Error e = __libdw_open_elf (fd, &elf);
      44          69 :   if (e == DWFL_E_NOERROR)
      45          69 :     return elf;
      46             : 
      47             :   /* Elf wasn't usable.  Make sure there is a proper elf error
      48             :      message.  This is probably not the real error, because there is
      49             :      no good way to propagate errnos or decompression errors, but
      50             :      better than nothing.  */
      51             : 
      52           0 :   if (e != DWFL_E_LIBELF)
      53             :     {
      54             :       /* Force a bad ELF error.  */
      55           0 :       char badelf[EI_NIDENT] = { };
      56           0 :       Elf *belf = elf_memory (badelf, EI_NIDENT);
      57           0 :       elf32_getehdr (belf);
      58           0 :       elf_end (belf);
      59             :     }
      60             : 
      61             :   return NULL;
      62             : }
      63             : OLD_VERSION (dwelf_elf_begin, ELFUTILS_0.175)
      64             : NEW_VERSION (dwelf_elf_begin, ELFUTILS_0.177)