121 lines
4.2 KiB
C
121 lines
4.2 KiB
C
/****************************************************************************
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* binfmt/libelf/elf_verify.c
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*
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* Copyright (C) 2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <string.h>
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#include <debug.h>
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#include <errno.h>
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#include <nuttx/binfmt/elf.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Constant Data
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****************************************************************************/
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static const char g_elfmagic[EI_MAGIC_SIZE] = { 0x7f, 'E', 'L', 'F' };
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: elf_verifyheader
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*
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* Description:
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* Given the header from a possible ELF executable, verify that it
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* is an ELF executable.
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*
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* Returned Value:
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* 0 (OK) is returned on success and a negated errno is returned on
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* failure.
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*
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* -ENOEXEC : Not an ELF file
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* -EINVAL : Not a relocatable ELF file or not supported by the current,
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* configured architecture.
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*
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****************************************************************************/
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int elf_verifyheader(FAR const Elf32_Ehdr *ehdr)
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{
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if (!ehdr)
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{
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bdbg("NULL ELF header!");
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return -ENOEXEC;
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}
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/* Verify that the magic number indicates an ELF file */
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if (memcmp(ehdr->e_ident, g_elfmagic, EI_MAGIC_SIZE) != 0)
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{
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bvdbg("Not ELF magic {%02x, %02x, %02x, %02x}\n",
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ehdr->e_ident[0], ehdr->e_ident[1], ehdr->e_ident[2], ehdr->e_ident[3]);
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return -ENOEXEC;
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}
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/* Verify that this is a relocatable file */
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if (ehdr->e_type != ET_REL)
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{
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bdbg("Not a relocatable file: e_type=%d\n", ehdr->e_type);
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return -EINVAL;
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}
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/* Verify that this file works with the currently configured architecture */
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if (arch_checkarch(ehdr))
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{
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bdbg("Not a supported architecture\n");
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return -ENOEXEC;
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}
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/* Looks good so far... we still might find some problems later. */
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return OK;
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}
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