Line data    Source code

       1             : /* Read all of the file associated with the descriptor.
       2             :    Copyright (C) 1998-2009, 2015 Red Hat, Inc.
       3             :    This file is part of elfutils.
       4             :    Contributed by Ulrich Drepper <drepper@redhat.com>, 1998.
       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 <errno.h>
      35             : #include <unistd.h>
      36             : #include <sys/stat.h>
      37             : 
      38             : #include <system.h>
      39             : #include "libelfP.h"
      40             : #include "common.h"
      41             : 
      42             : 
      43             : static void
      44           1 : set_address (Elf *elf, size_t offset)
      45             : {
      46           1 :   if (elf->kind == ELF_K_AR)
      47             :     {
      48           0 :       Elf *child = elf->state.ar.children;
      49             : 
      50           0 :       while (child != NULL)
      51             :         {
      52           0 :           if (child->map_address == NULL)
      53             :             {
      54           0 :               child->map_address = elf->map_address;
      55           0 :               child->start_offset -= offset;
      56           0 :               if (child->kind == ELF_K_AR)
      57           0 :                 child->state.ar.offset -= offset;
      58             : 
      59           0 :               set_address (child, offset);
      60             :             }
      61             : 
      62           0 :           child = child->next;
      63             :         }
      64             :     }
      65           1 : }
      66             : 
      67             : 
      68             : char *
      69             : internal_function
      70           1 : __libelf_readall (Elf *elf)
      71             : {
      72             :   /* Get the file.  */
      73             :   rwlock_wrlock (elf->lock);
      74             : 
      75           1 :   if (elf->map_address == NULL && unlikely (elf->fildes == -1))
      76             :     {
      77           0 :       __libelf_seterrno (ELF_E_INVALID_HANDLE);
      78             :       rwlock_unlock (elf->lock);
      79           0 :       return NULL;
      80             :     }
      81             : 
      82             :   /* If the file is not mmap'ed and not previously loaded, do it now.  */
      83           1 :   if (elf->map_address == NULL)
      84             :     {
      85           1 :       char *mem = NULL;
      86             : 
      87             :       /* If this is an archive and we have derived descriptors get the
      88             :          locks for all of them.  */
      89           1 :       libelf_acquire_all (elf);
      90             : 
      91           1 :       if (elf->maximum_size == ~((size_t) 0))
      92             :         {
      93             :           /* We don't yet know how large the file is.   Determine that now.  */
      94             :           struct stat st;
      95             : 
      96           0 :           if (fstat (elf->fildes, &st) < 0)
      97             :             goto read_error;
      98             : 
      99             :           if (sizeof (size_t) >= sizeof (st.st_size)
     100             :               || st.st_size <= ~((size_t) 0))
     101           0 :             elf->maximum_size = (size_t) st.st_size;
     102             :           else
     103             :             {
     104             :               errno = EOVERFLOW;
     105             :               goto read_error;
     106             :             }
     107             :         }
     108             : 
     109             :       /* Allocate all the memory we need.  */
     110           1 :       mem = (char *) malloc (elf->maximum_size);
     111           1 :       if (mem != NULL)
     112             :         {
     113             :           /* Read the file content.  */
     114           1 :           if (unlikely ((size_t) pread_retry (elf->fildes, mem,
     115             :                                               elf->maximum_size,
     116             :                                               elf->start_offset)
     117             :                         != elf->maximum_size))
     118             :             {
     119             :               /* Something went wrong.  */
     120             :             read_error:
     121           0 :               __libelf_seterrno (ELF_E_READ_ERROR);
     122           0 :               free (mem);
     123             :             }
     124             :           else
     125             :             {
     126             :               /* Remember the address.  */
     127           1 :               elf->map_address = mem;
     128             : 
     129             :               /* Also remember that we allocated the memory.  */
     130           1 :               elf->flags |= ELF_F_MALLOCED;
     131             : 
     132             :               /* Propagate the information down to all children and
     133             :                  their children.  */
     134           1 :               set_address (elf, elf->start_offset);
     135             : 
     136             :               /* Correct the own offsets.  */
     137           1 :               if (elf->kind == ELF_K_AR)
     138           0 :                 elf->state.ar.offset -= elf->start_offset;
     139           1 :               elf->start_offset = 0;
     140             :             }
     141             :         }
     142             :       else
     143           0 :         __libelf_seterrno (ELF_E_NOMEM);
     144             : 
     145             :       /* Free the locks on the children.  */
     146           1 :       libelf_release_all (elf);
     147             :     }
     148             : 
     149             :   rwlock_unlock (elf->lock);
     150             : 
     151           1 :   return (char *) elf->map_address;
     152             : }