GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.sbin/config/exec_elf.c Lines: 0 47 0.0 %
Date: 2017-11-13 Branches: 0 42 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: exec_elf.c,v 1.16 2017/10/29 08:45:53 mpi Exp $ */
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/*
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 * Copyright (c) 1999 Mats O Jansson.  All rights reserved.
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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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 * 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 the
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 *    documentation and/or other materials provided with the distribution.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include <sys/types.h>
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#include <sys/exec.h>
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#include <elf.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <nlist.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "ukc.h"
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#include "config.h"
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#include "exec.h"
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caddr_t		ptr, rest, pre;
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Elf_Ehdr	elf_ex;
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Elf_Phdr	*elf_phdr;
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Elf_Shdr	*elf_shdr;
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char		*elf_total;
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char		*elf_shstrtab;
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off_t		elf_size;
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caddr_t
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adjust(caddr_t x)
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{
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	int i;
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	Elf_Shdr *s;
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	unsigned long y = 0;
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	s = elf_shdr;
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	for (i = 0; i < elf_ex.e_shnum; i++) {
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		if (s[i].sh_addr == 0)
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			continue;
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		if (((unsigned long)x >= s[i].sh_addr) &&
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		    ((unsigned long)x < (s[i].sh_addr+s[i].sh_size))) {
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			y = (unsigned long)&elf_total[(unsigned long)x -
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			    s[i].sh_addr + s[i].sh_offset];
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			break;
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		}
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	}
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	return((caddr_t)y);
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}
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caddr_t
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readjust(caddr_t x)
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{
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	int i;
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	Elf_Shdr *s;
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	unsigned long y = 0;
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	s = elf_shdr;
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	for (i = 0; i < elf_ex.e_shnum; i++) {
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		if (s[i].sh_addr == 0)
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			continue;
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		if (((x - elf_total) >= s[i].sh_offset) &&
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		    ((x - elf_total) <= (s[i].sh_offset + s[i].sh_size)))
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			y = (unsigned long)x - (unsigned long)elf_total +
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			    (unsigned long)s[i].sh_addr - s[i].sh_offset;
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	}
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	return((caddr_t)y);
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}
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void
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loadkernel(char *file)
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{
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	int fd;
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	if ((fd = open(file, O_RDONLY | O_EXLOCK, 0)) < 0)
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		err(1, "%s", file);
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	if (read(fd, (char *)&elf_ex, sizeof(elf_ex)) != sizeof(elf_ex))
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		errx(1, "can't read elf header");
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	if (!IS_ELF(elf_ex))
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		errx(1, "bad elf magic");
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	elf_size = lseek(fd, (off_t)0, SEEK_END);
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	(void)lseek(fd, (off_t)0, SEEK_SET);
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	elf_total = emalloc((size_t)elf_size);
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	if (read(fd, elf_total, (size_t)elf_size) != elf_size)
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		errx(1, "can't read elf kernel");
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	if (elf_ex.e_phoff > (size_t)elf_size)
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		errx(1, "incorrect ELF header or truncated file");
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	if (elf_ex.e_shoff > (size_t)elf_size)
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		errx(1, "incorrect ELF header or truncated file");
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	elf_phdr = (Elf_Phdr *)&elf_total[elf_ex.e_phoff];
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	elf_shdr = (Elf_Shdr *)&elf_total[elf_ex.e_shoff];
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	if ((char *)&elf_shdr[elf_ex.e_shstrndx] +
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	    sizeof(elf_shdr[elf_ex.e_shstrndx]) >= elf_total + (size_t)elf_size)
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		errx(1, "incorrect ELF header or truncated file");
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	if ((char *)&elf_shdr[elf_ex.e_shstrndx].sh_offset +
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	    sizeof(elf_shdr[elf_ex.e_shstrndx].sh_offset) >=
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	    elf_total + (size_t)elf_size)
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		errx(1, "incorrect ELF header or truncated file");
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	elf_shstrtab = &elf_total[elf_shdr[elf_ex.e_shstrndx].sh_offset];
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	close(fd);
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}
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void
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savekernel(char *outfile)
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{
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	int fd;
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	if ((fd = open(outfile, O_WRONLY | O_CREAT | O_TRUNC, 0700)) < 0)
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		err(1, "%s", outfile);
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	if (write(fd, elf_total, (size_t)elf_size) != elf_size)
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		errx(1, "can't write file %s", outfile);
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	close(fd);
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}