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Member "file-5.35/src/elfclass.h" (11 Sep 2018, 3097 Bytes) of package /linux/misc/file-5.35.tar.gz:


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    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             (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             (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             (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;