170 lines
4.3 KiB
C
170 lines
4.3 KiB
C
/* $NetBSD: exec.c,v 1.26 2008/03/25 21:23:50 christos Exp $ */
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/*-
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* Copyright (c) 1982, 1986, 1990, 1993
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* The Regents of the University of California. 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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* 3. Neither the name of the University nor the names of its contributors
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* may be 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 REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifdef _KERNEL_OPT
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#include "opt_insecure.h"
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#endif
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#include <sys/param.h>
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#include <sys/reboot.h>
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#ifndef INSECURE
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#include <sys/stat.h>
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#endif
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#include <sys/exec.h>
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#ifdef _STANDALONE
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#include <lib/libkern/libkern.h>
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#else
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#include <string.h>
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#endif
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#include "stand.h"
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void
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exec(char *path, char *loadaddr, int howto)
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{
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#ifndef INSECURE
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struct stat sb;
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#endif
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struct exec x;
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int io, i;
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char *addr, *ssym, *esym;
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io = open(path, 0);
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if (io < 0)
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return;
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#ifndef INSECURE
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(void) fstat(io, &sb);
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if (sb.st_uid || (sb.st_mode & 2)) {
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printf("non-secure file, will not load\n");
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close(io);
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errno = EPERM;
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return;
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}
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#endif
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i = read(io, (char *)&x, sizeof(x));
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if (i != sizeof(x) || N_BADMAG(x)) {
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errno = EFTYPE;
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return;
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}
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/* Text */
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printf("%ld", x.a_text);
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addr = loadaddr;
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if (N_GETMAGIC(x) == ZMAGIC) {
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(void)memcpy(addr, &x, sizeof(x));
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addr += sizeof(x);
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x.a_text -= sizeof(x);
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}
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if (read(io, (char *)addr, x.a_text) != (ssize_t)x.a_text)
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goto shread;
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addr += x.a_text;
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if (N_GETMAGIC(x) == ZMAGIC || N_GETMAGIC(x) == NMAGIC)
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while ((long)addr & (N_PAGSIZ(x) - 1))
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*addr++ = 0;
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/* Data */
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printf("+%ld", x.a_data);
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if (read(io, addr, x.a_data) != (ssize_t)x.a_data)
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goto shread;
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addr += x.a_data;
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/* Bss */
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printf("+%ld", x.a_bss);
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for (i = 0; i < (int)x.a_bss; i++)
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*addr++ = 0;
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/* Symbols */
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ssym = addr;
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(void)memcpy(addr, &x.a_syms, sizeof(x.a_syms));
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addr += sizeof(x.a_syms);
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if (x.a_syms) {
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printf("+[%ld", x.a_syms);
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if (read(io, addr, x.a_syms) != (ssize_t)x.a_syms)
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goto shread;
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addr += x.a_syms;
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}
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i = 0;
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if (x.a_syms && read(io, &i, sizeof(int)) != sizeof(int))
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goto shread;
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(void)memcpy(addr, &i, sizeof(int));
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if (i) {
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i -= sizeof(int);
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addr += sizeof(int);
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if (read(io, addr, i) != i)
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goto shread;
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addr += i;
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}
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if (x.a_syms) {
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/* and that many bytes of (debug symbols?) */
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printf("+%d]", i);
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}
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close(io);
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#define round_to_size(x) \
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(((int)(x) + sizeof(int) - 1) & ~(sizeof(int) - 1))
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esym = (char *)round_to_size(addr - loadaddr);
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#undef round_to_size
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/* and note the end address of all this */
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printf(" total=0x%lx\n", (u_long)addr);
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/*
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* Machine-dependent code must now adjust the
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* entry point. This used to be done here,
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* but some systems may need to relocate the
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* loaded file before jumping to it, and the
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* displayed start address would be wrong.
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*/
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#ifdef EXEC_DEBUG
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printf("ssym=0x%x esym=0x%x\n", ssym, esym);
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printf("\n\nReturn to boot...\n");
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getchar();
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#endif
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machdep_start((char *)x.a_entry, howto, loadaddr, ssym, esym);
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/* exec failed */
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errno = ENOEXEC;
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return;
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shread:
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close(io);
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errno = EIO;
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return;
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}
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