LCOV - code coverage report
Current view: top level - libelf - note_xlate.h (source / functions) Hit Total Coverage
Test: elfutils-0.189 Lines: 32 37 86.5 %
Date: 2023-08-29 13:46:25 Functions: 3 3 100.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 14 18 77.8 %

           Branch data     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                 :        521 : 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                 :        521 :   assert (sizeof (Elf32_Nhdr) == sizeof (Elf64_Nhdr));
      36                 :            : 
      37         [ +  + ]:       1149 :   while (len >= sizeof (Elf32_Nhdr))
      38                 :            :     {
      39                 :            :       /* Convert the header.  */
      40                 :        640 :       (1 ? Elf32_cvt_Nhdr : Elf64_cvt_Nhdr) (dest, src, sizeof (Elf32_Nhdr),
      41                 :            :                                              encode);
      42         [ +  + ]:        640 :       const Elf32_Nhdr *n = encode ? src : dest;
      43                 :            : 
      44                 :        640 :       size_t note_len = sizeof *n;
      45                 :            : 
      46                 :            :       /* desc needs to be aligned.  */
      47                 :        640 :       note_len += n->n_namesz;
      48         [ +  + ]:        640 :       note_len = nhdr8 ? NOTE_ALIGN8 (note_len) : NOTE_ALIGN4 (note_len);
      49         [ +  + ]:        640 :       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                 :        628 :       note_len += n->n_descsz;
      60         [ +  + ]:        628 :       note_len = nhdr8 ? NOTE_ALIGN8 (note_len) : NOTE_ALIGN4 (note_len);
      61         [ -  + ]:        628 :       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                 :        628 :       size_t note_data_len = note_len - sizeof *n;
      72                 :        628 :       src += sizeof *n;
      73                 :        628 :       dest += sizeof *n;
      74         [ +  + ]:        628 :       if (src != dest)
      75                 :        626 :         memcpy (dest, src, note_data_len);
      76                 :            : 
      77                 :        628 :       src += note_data_len;
      78                 :        628 :       dest += note_data_len;
      79                 :        628 :       len -= note_len;
      80                 :            :     }
      81                 :            : 
      82                 :            :     /* Copy over any leftover data unconverted.  Probably part of
      83                 :            :        truncated name/desc data.  */
      84   [ -  +  -  - ]:        521 :     if (unlikely (len > 0) && src != dest)
      85                 :          0 :       memcpy (dest, src, len);
      86                 :        521 : }
      87                 :            : 
      88                 :            : static void
      89                 :        519 : elf_cvt_note4 (void *dest, const void *src, size_t len, int encode)
      90                 :            : {
      91                 :        519 :   elf_cvt_note (dest, src, len, encode, false);
      92                 :        519 : }
      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 : }

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