Line data    Source code

       1             : /* Conversion functions for notes.
       2             :    Copyright (C) 2007, 2009, 2014, 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             : static void
      30         443 : elf_cvt_note (void *dest, const void *src, size_t len, int encode,
      31             :               bool nhdr8)
      32             : {
      33             :   /* Note that the header is always the same size, but the padding
      34             :      differs for GNU Property notes.  */
      35         443 :   assert (sizeof (Elf32_Nhdr) == sizeof (Elf64_Nhdr));
      36             : 
      37        1037 :   while (len >= sizeof (Elf32_Nhdr))
      38             :     {
      39             :       /* Convert the header.  */
      40         606 :       (1 ? Elf32_cvt_Nhdr : Elf64_cvt_Nhdr) (dest, src, sizeof (Elf32_Nhdr),
      41             :                                              encode);
      42         606 :       const Elf32_Nhdr *n = encode ? src : dest;
      43             : 
      44         606 :       size_t note_len = sizeof *n;
      45             : 
      46             :       /* desc needs to be aligned.  */
      47         606 :       note_len += n->n_namesz;
      48         606 :       note_len = nhdr8 ? NOTE_ALIGN8 (note_len) : NOTE_ALIGN4 (note_len);
      49         606 :       if (note_len > len || note_len < sizeof *n)
      50             :         {
      51             :           /* Header was translated, nothing else.  */
      52          12 :           len -= sizeof *n;
      53          12 :           src += sizeof *n;
      54          12 :           dest += sizeof *n;
      55          12 :           break;
      56             :         }
      57             : 
      58             :       /* data as a whole needs to be aligned.  */
      59         594 :       note_len += n->n_descsz;
      60         594 :       note_len = nhdr8 ? NOTE_ALIGN8 (note_len) : NOTE_ALIGN4 (note_len);
      61         594 :       if (note_len > len || note_len < sizeof *n)
      62             :         {
      63             :           /* Header was translated, nothing else.  */
      64           0 :           len -= sizeof *n;
      65           0 :           src += sizeof *n;
      66           0 :           dest += sizeof *n;
      67           0 :           break;
      68             :         }
      69             : 
      70             :       /* Copy or skip the note data.  */
      71         594 :       size_t note_data_len = note_len - sizeof *n;
      72         594 :       src += sizeof *n;
      73         594 :       dest += sizeof *n;
      74         594 :       if (src != dest)
      75         592 :         memcpy (dest, src, note_data_len);
      76             : 
      77         594 :       src += note_data_len;
      78         594 :       dest += note_data_len;
      79         594 :       len -= note_len;
      80             :     }
      81             : 
      82             :     /* Copy over any leftover data unconverted.  Probably part of
      83             :        truncated name/desc data.  */
      84         443 :     if (unlikely (len > 0) && src != dest)
      85           0 :       memcpy (dest, src, len);
      86         443 : }
      87             : 
      88             : static void
      89         441 : elf_cvt_note4 (void *dest, const void *src, size_t len, int encode)
      90             : {
      91         441 :   elf_cvt_note (dest, src, len, encode, false);
      92         441 : }
      93             : 
      94             : static void
      95           2 : elf_cvt_note8 (void *dest, const void *src, size_t len, int encode)
      96             : {
      97           2 :   elf_cvt_note (dest, src, len, encode, true);
      98           2 : }