root/ext/fileinfo/libmagic/elfclass.h

   1 /*
   2  * Copyright (c) Christos Zoulas 2008.
   3  * All Rights Reserved.
   4  * 
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice immediately at the beginning of the file, without modification,
  10  *    this list of conditions, and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *  
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  19  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  */
  27         if (nbytes <= sizeof(elfhdr))
  28                 return 0;
  29 
  30         u.l = 1;
  31         (void)memcpy(&elfhdr, buf, sizeof elfhdr);
  32         swap = (u.c[sizeof(int32_t) - 1] + 1) != elfhdr.e_ident[EI_DATA];
  33 
  34         type = elf_getu16(swap, elfhdr.e_type);
  35         notecount = ms->elf_notes_max;
  36         switch (type) {
  37 #ifdef ELFCORE
  38         case ET_CORE:
  39                 phnum = elf_getu16(swap, elfhdr.e_phnum);
  40                 if (phnum > ms->elf_phnum_max)
  41                         return toomany(ms, "program headers", phnum);
  42                 flags |= FLAGS_IS_CORE;
  43                 if (dophn_core(ms, clazz, swap, fd,
  44                     (zend_off_t)elf_getu(swap, elfhdr.e_phoff), phnum,
  45                     (size_t)elf_getu16(swap, elfhdr.e_phentsize),
  46                     fsize, &flags, &notecount) == -1)
  47                         return -1;
  48                 break;
  49 #endif
  50         case ET_EXEC:
  51         case ET_DYN:
  52                 phnum = elf_getu16(swap, elfhdr.e_phnum);
  53                 if (phnum > ms->elf_phnum_max)
  54                         return toomany(ms, "program", phnum);
  55                 shnum = elf_getu16(swap, elfhdr.e_shnum);
  56                 if (shnum > ms->elf_shnum_max)
  57                         return toomany(ms, "section", shnum);
  58                 if (dophn_exec(ms, clazz, swap, fd,
  59                     (zend_off_t)elf_getu(swap, elfhdr.e_phoff), phnum,
  60                     (size_t)elf_getu16(swap, elfhdr.e_phentsize),
  61                     fsize, shnum, &flags, &notecount) == -1)
  62                         return -1;
  63                 /*FALLTHROUGH*/
  64         case ET_REL:
  65                 shnum = elf_getu16(swap, elfhdr.e_shnum);
  66                 if (shnum > ms->elf_shnum_max)
  67                         return toomany(ms, "section headers", shnum);
  68                 if (doshn(ms, clazz, swap, fd,
  69                     (zend_off_t)elf_getu(swap, elfhdr.e_shoff), shnum,
  70                     (size_t)elf_getu16(swap, elfhdr.e_shentsize),
  71                     fsize, elf_getu16(swap, elfhdr.e_machine),
  72                     (int)elf_getu16(swap, elfhdr.e_shstrndx),
  73                     &flags, &notecount) == -1)
  74                         return -1;
  75                 break;
  76 
  77         default:
  78                 break;
  79         }
  80         if (notecount == 0)
  81                 return toomany(ms, "notes", ms->elf_notes_max);
  82         return 1;