165 lines
4.2 KiB
C
165 lines
4.2 KiB
C
/* $NetBSD: exec.c,v 1.28 2009/12/29 20:21:46 elad Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 1982, 1986, 1990, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/reboot.h>
|
|
#ifndef SA_EXEC_ANYOWNER
|
|
#include <sys/stat.h>
|
|
#endif
|
|
#include <sys/exec_aout.h>
|
|
#ifdef _STANDALONE
|
|
#include <lib/libkern/libkern.h>
|
|
#else
|
|
#include <string.h>
|
|
#endif
|
|
|
|
#include "stand.h"
|
|
|
|
void
|
|
exec(char *path, char *loadaddr, int howto)
|
|
{
|
|
#ifndef SA_EXEC_ANYOWNER
|
|
struct stat sb;
|
|
#endif
|
|
struct exec x;
|
|
int io, i;
|
|
char *addr, *ssym, *esym;
|
|
|
|
io = open(path, 0);
|
|
if (io < 0)
|
|
return;
|
|
|
|
#ifndef SA_EXEC_ANYOWNER
|
|
(void) fstat(io, &sb);
|
|
if (sb.st_uid || (sb.st_mode & 2)) {
|
|
printf("non-secure file, will not load\n");
|
|
close(io);
|
|
errno = EPERM;
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
i = read(io, (char *)&x, sizeof(x));
|
|
if (i != sizeof(x) || N_BADMAG(x)) {
|
|
errno = EFTYPE;
|
|
return;
|
|
}
|
|
|
|
/* Text */
|
|
printf("%ld", x.a_text);
|
|
addr = loadaddr;
|
|
if (N_GETMAGIC(x) == ZMAGIC) {
|
|
(void)memcpy(addr, &x, sizeof(x));
|
|
addr += sizeof(x);
|
|
x.a_text -= sizeof(x);
|
|
}
|
|
if (read(io, (char *)addr, x.a_text) != (ssize_t)x.a_text)
|
|
goto shread;
|
|
addr += x.a_text;
|
|
if (N_GETMAGIC(x) == ZMAGIC || N_GETMAGIC(x) == NMAGIC)
|
|
while ((long)addr & (N_PAGSIZ(x) - 1))
|
|
*addr++ = 0;
|
|
|
|
/* Data */
|
|
printf("+%ld", x.a_data);
|
|
if (read(io, addr, x.a_data) != (ssize_t)x.a_data)
|
|
goto shread;
|
|
addr += x.a_data;
|
|
|
|
/* Bss */
|
|
printf("+%ld", x.a_bss);
|
|
for (i = 0; i < (int)x.a_bss; i++)
|
|
*addr++ = 0;
|
|
|
|
/* Symbols */
|
|
ssym = addr;
|
|
(void)memcpy(addr, &x.a_syms, sizeof(x.a_syms));
|
|
addr += sizeof(x.a_syms);
|
|
if (x.a_syms) {
|
|
printf("+[%ld", x.a_syms);
|
|
if (read(io, addr, x.a_syms) != (ssize_t)x.a_syms)
|
|
goto shread;
|
|
addr += x.a_syms;
|
|
}
|
|
|
|
i = 0;
|
|
if (x.a_syms && read(io, &i, sizeof(int)) != sizeof(int))
|
|
goto shread;
|
|
|
|
(void)memcpy(addr, &i, sizeof(int));
|
|
if (i) {
|
|
i -= sizeof(int);
|
|
addr += sizeof(int);
|
|
if (read(io, addr, i) != i)
|
|
goto shread;
|
|
addr += i;
|
|
}
|
|
|
|
if (x.a_syms) {
|
|
/* and that many bytes of (debug symbols?) */
|
|
printf("+%d]", i);
|
|
}
|
|
|
|
close(io);
|
|
|
|
#define round_to_size(x) \
|
|
(((int)(x) + sizeof(int) - 1) & ~(sizeof(int) - 1))
|
|
esym = (char *)round_to_size(addr - loadaddr);
|
|
#undef round_to_size
|
|
|
|
/* and note the end address of all this */
|
|
printf(" total=0x%lx\n", (u_long)addr);
|
|
|
|
/*
|
|
* Machine-dependent code must now adjust the
|
|
* entry point. This used to be done here,
|
|
* but some systems may need to relocate the
|
|
* loaded file before jumping to it, and the
|
|
* displayed start address would be wrong.
|
|
*/
|
|
|
|
#ifdef EXEC_DEBUG
|
|
printf("ssym=0x%x esym=0x%x\n", ssym, esym);
|
|
printf("\n\nReturn to boot...\n");
|
|
getchar();
|
|
#endif
|
|
|
|
machdep_start((char *)x.a_entry, howto, loadaddr, ssym, esym);
|
|
|
|
/* exec failed */
|
|
errno = ENOEXEC;
|
|
return;
|
|
|
|
shread:
|
|
close(io);
|
|
errno = EIO;
|
|
return;
|
|
}
|