Annotation of sys/lib/libsa/exec.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: exec.c,v 1.26 2003/08/11 06:23:09 deraadt Exp $ */
! 2: /* $NetBSD: exec.c,v 1.15 1996/10/13 02:29:01 christos Exp $ */
! 3:
! 4: /*-
! 5: * Copyright (c) 1982, 1986, 1990, 1993
! 6: * The Regents of the University of California. All rights reserved.
! 7: *
! 8: * Redistribution and use in source and binary forms, with or without
! 9: * modification, are permitted provided that the following conditions
! 10: * are met:
! 11: * 1. Redistributions of source code must retain the above copyright
! 12: * notice, this list of conditions and the following disclaimer.
! 13: * 2. Redistributions in binary form must reproduce the above copyright
! 14: * notice, this list of conditions and the following disclaimer in the
! 15: * documentation and/or other materials provided with the distribution.
! 16: * 3. Neither the name of the University nor the names of its contributors
! 17: * may be used to endorse or promote products derived from this software
! 18: * without specific prior written permission.
! 19: *
! 20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 30: * SUCH DAMAGE.
! 31: */
! 32:
! 33: #include <sys/param.h>
! 34: #include <sys/exec.h>
! 35: #include <sys/reboot.h>
! 36: #ifndef INSECURE
! 37: #include <sys/stat.h>
! 38: #endif
! 39:
! 40: #include "stand.h"
! 41:
! 42: static char *ssym, *esym;
! 43:
! 44: extern u_int opendev;
! 45:
! 46: void
! 47: exec(char *path, void *loadaddr, int howto)
! 48: {
! 49: int io;
! 50: #ifndef INSECURE
! 51: struct stat sb;
! 52: #endif
! 53: struct exec x;
! 54: u_int i;
! 55: ssize_t sz;
! 56: char *addr;
! 57: #ifdef EXEC_DEBUG
! 58: char *daddr, *etxt;
! 59: #endif
! 60:
! 61: io = open(path, 0);
! 62: if (io < 0)
! 63: return;
! 64:
! 65: (void) fstat(io, &sb);
! 66: if (sb.st_mode & 2)
! 67: printf("non-secure file, check permissions!\n");
! 68:
! 69: sz = read(io, (char *)&x, sizeof(x));
! 70: if (sz != sizeof(x) || N_BADMAG(x)) {
! 71: close(io);
! 72: errno = EFTYPE;
! 73: return;
! 74: }
! 75:
! 76: #ifdef EXEC_DEBUG
! 77: printf("\nstruct exec {%x, %x, %x, %x, %x, %x, %x, %x}\n",
! 78: x.a_midmag, x.a_text, x.a_data, x.a_bss, x.a_syms,
! 79: x.a_entry, x.a_trsize, x.a_drsize);
! 80: #endif
! 81:
! 82: /* Text */
! 83: printf("%u", x.a_text);
! 84: addr = loadaddr;
! 85: sz = x.a_text;
! 86: if (N_GETMAGIC(x) == ZMAGIC) {
! 87: bcopy((char *)&x, addr, sizeof x);
! 88: addr += sizeof x;
! 89: sz -= sizeof x;
! 90: }
! 91: if (read(io, (char *)addr, sz) != sz)
! 92: goto shread;
! 93: addr += sz;
! 94: #ifdef EXEC_DEBUG
! 95: printf("\ntext {%x, %x, %x, %x}\n",
! 96: addr[0], addr[1], addr[2], addr[3]);
! 97: etxt = addr;
! 98: #endif
! 99: if (N_GETMAGIC(x) == NMAGIC)
! 100: while ((long)addr & (N_PAGSIZ(x) - 1))
! 101: *addr++ = 0;
! 102:
! 103: /* Data */
! 104: #ifdef EXEC_DEBUG
! 105: daddr = addr;
! 106: #endif
! 107: printf("+%u", x.a_data);
! 108: if (read(io, addr, x.a_data) != (ssize_t)x.a_data)
! 109: goto shread;
! 110: addr += x.a_data;
! 111:
! 112: /* Bss */
! 113: printf("+%u", x.a_bss);
! 114: for (i = 0; i < x.a_bss; i++)
! 115: *addr++ = 0;
! 116:
! 117: /* Symbols */
! 118: if (x.a_syms) {
! 119: ssym = addr;
! 120: bcopy(&x.a_syms, addr, sizeof(x.a_syms));
! 121: addr += sizeof(x.a_syms);
! 122: printf("+[%u", x.a_syms);
! 123: if (read(io, addr, x.a_syms) != (ssize_t)x.a_syms)
! 124: goto shread;
! 125: addr += x.a_syms;
! 126:
! 127: if (read(io, &i, sizeof(u_int)) != sizeof(u_int))
! 128: goto shread;
! 129:
! 130: bcopy(&i, addr, sizeof(u_int));
! 131: if (i) {
! 132: sz = i - sizeof(int);
! 133: addr += sizeof(int);
! 134: if (read(io, addr, sz) != sz)
! 135: goto shread;
! 136: addr += sz;
! 137: }
! 138:
! 139: /* and that many bytes of string table */
! 140: printf("+%d]", sz);
! 141: esym = addr;
! 142: } else {
! 143: ssym = 0;
! 144: esym = 0;
! 145: }
! 146:
! 147: close(io);
! 148:
! 149: /* and note the end address of all this */
! 150: printf(" total=0x%lx", (u_long)addr);
! 151:
! 152: /* XXX - Hack alert!
! 153: This is no good, loadaddr is passed into
! 154: machdep_start(), and it should do whatever
! 155: is needed.
! 156:
! 157: x.a_entry += (long)loadaddr;
! 158: */
! 159: printf(" start=0x%x\n", x.a_entry);
! 160:
! 161: #ifdef EXEC_DEBUG
! 162: printf("loadaddr=%p etxt=%p daddr=%p ssym=%p esym=%p\n",
! 163: loadaddr, etxt, daddr, ssym, esym);
! 164: printf("\n\nReturn to boot...\n");
! 165: getchar();
! 166: #endif
! 167:
! 168: machdep_start((char *)((register_t)x.a_entry), howto, loadaddr, ssym,
! 169: esym);
! 170:
! 171: /* exec failed */
! 172: errno = ENOEXEC;
! 173: return;
! 174:
! 175: shread:
! 176: close(io);
! 177: errno = EIO;
! 178: return;
! 179: }
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