FreeBSD/Linux Kernel Cross Reference
sys/lib/libsa/exec.c

     /*      $NetBSD: exec.c,v 1.23 2003/08/31 22:40:48 fvdl 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.
     */
    
    #ifdef _KERNEL_OPT
    #include "opt_insecure.h"
    #endif
    
    #include <sys/param.h>
    #include <sys/reboot.h>
    #ifndef INSECURE
    #include <sys/stat.h>
    #endif
    #include <sys/exec.h>
    #ifdef _STANDALONE
    #include <lib/libkern/libkern.h>
    #else
    #include <string.h>
    #endif
    
    #include "stand.h"
    
    void
    exec(path, loadaddr, howto)
            char *path;
            char *loadaddr;
            int howto;
    {
    #ifndef INSECURE
            struct stat sb;
    #endif
            struct exec x;
            int io, i;
            char *addr, *ssym, *esym;
    
            io = open(path, 0);
            if (io < 0)
                    return;
    
    #ifndef INSECURE
            (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) {
                    bcopy(&x, addr, 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;
           bcopy(&x.a_syms, addr, 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;
   
           bcopy(&i, addr, 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;
   }

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