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120 lines
4.2 KiB
120 lines
4.2 KiB
/**************************************************************************** |
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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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