Branch data     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                 :          1 :   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                 :          0 :       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                 :          0 :           struct stat st;
      95                 :            : 
      96         [ #  # ]:          0 :           if (fstat (elf->fildes, &st) < 0)
      97                 :          0 :             goto read_error;
      98                 :            : 
      99                 :          0 :           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 = 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                 :          0 :             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                 :          1 :   rwlock_unlock (elf->lock);
     150                 :            : 
     151                 :          1 :   return (char *) elf->map_address;
     152                 :            : }