arch/all-pc/boot/grub2-aros/grub-core/commands/fileXX.c

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 2013  Free Software Foundation, Inc.
   4  *
   5  *  GRUB is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  GRUB is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <grub/fileid.h>
  20 #include <grub/elfload.h>
  21 #include <grub/misc.h>
  22
  23 #pragma GCC diagnostic ignored "-Wcast-align"
  24
  25 int
  26 grub_file_check_netbsdXX (grub_elf_t elf)
  27 {
  28   Elf_Shdr *s, *s0;
  29
  30   grub_size_t shnum = elf->ehdr.ehdrXX.e_shnum;
  31   grub_size_t shentsize = elf->ehdr.ehdrXX.e_shentsize;
  32   grub_size_t shsize = shnum * shentsize;
  33   grub_off_t stroff;
  34
  35   if (!shnum || !shentsize)
  36     return 0;
  37
  38   s0 = grub_malloc (shsize);
  39   if (!s0)
  40     return 0;
  41
  42   if (grub_file_seek (elf->file, elf->ehdr.ehdrXX.e_shoff) == (grub_off_t) -1)
  43     goto fail;
  44
  45   if (grub_file_read (elf->file, s0, shsize) != (grub_ssize_t) shsize)
  46     goto fail;
  47
  48   s = (Elf_Shdr *) ((char *) s0 + elf->ehdr.ehdrXX.e_shstrndx * shentsize);
  49   stroff = s->sh_offset;
  50
  51   for (s = s0; s < (Elf_Shdr *) ((char *) s0 + shnum * shentsize);
  52        s = (Elf_Shdr *) ((char *) s + shentsize))
  53     {
  54       char name[sizeof(".note.netbsd.ident")];
  55       grub_memset (name, 0, sizeof (name));
  56       if (grub_file_seek (elf->file, stroff + s->sh_name) == (grub_off_t) -1)
  57         goto fail;
  58
  59       if (grub_file_read (elf->file, name, sizeof (name)) != (grub_ssize_t) sizeof (name))
  60         {
  61           if (grub_errno)
  62             goto fail;
  63           continue;
  64         }
  65       if (grub_memcmp (name, ".note.netbsd.ident",
  66                        sizeof(".note.netbsd.ident")) != 0)
  67         continue;
  68       grub_free (s0);
  69       return 1;
  70     }
  71  fail:
  72   grub_free (s0);
  73   return 0;
  74 }