111 lines
3.5 KiB
C
111 lines
3.5 KiB
C
/****************************************************************************
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* binfmt/libelf/libelf_verify.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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/elf.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] =
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{
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0x7f, 'E', 'L', 'F'
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};
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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 Elf_Ehdr *ehdr)
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{
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if (!ehdr)
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{
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berr("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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binfo("Not ELF magic {%02x, %02x, %02x, %02x}\n",
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ehdr->e_ident[0], ehdr->e_ident[1], ehdr->e_ident[2],
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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) && (ehdr->e_type != ET_EXEC))
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{
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berr("Not a relocatable or executable file: e_type=%d\n",
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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 (!up_checkarch(ehdr))
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{
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berr("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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