The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/svr4/imgact_svr4.c

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    1 /*-
    2  * Copyright (c) 1998 Mark Newton
    3  * Copyright (c) 1994-1996 Søren Schmidt
    4  * All rights reserved.
    5  *
    6  * Based heavily on /sys/kern/imgact_aout.c which is:
    7  * Copyright (c) 1993, David Greenman
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer 
   14  *    in this position and unchanged.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. The name of the author may not be used to endorse or promote products
   19  *    derived from this software withough specific prior written permission
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   31  *
   32  * $FreeBSD: src/sys/svr4/imgact_svr4.c,v 1.8.2.1 2001/11/03 01:41:09 ps Exp $
   33  */
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/resourcevar.h>
   38 #include <sys/exec.h>
   39 #include <sys/mman.h>
   40 #include <sys/imgact.h>
   41 #include <sys/imgact_aout.h>
   42 #include <sys/kernel.h>
   43 #include <sys/lock.h>
   44 #include <sys/proc.h>
   45 #include <sys/vnode.h>
   46 
   47 #include <vm/vm.h>
   48 #include <vm/vm_kern.h>
   49 #include <vm/vm_param.h>
   50 #include <vm/pmap.h>
   51 #include <vm/vm_map.h>
   52 #include <vm/vm_extern.h>
   53 
   54 #include <svr4/svr4.h>
   55 
   56 static int      exec_svr4_imgact __P((struct image_params *iparams));
   57 
   58 static int
   59 exec_svr4_imgact(imgp)
   60     struct image_params *imgp;
   61 {
   62     const struct exec *a_out = (const struct exec *) imgp->image_header;
   63     struct vmspace *vmspace;
   64     vm_offset_t vmaddr;
   65     unsigned long virtual_offset, file_offset;
   66     vm_offset_t buffer;
   67     unsigned long bss_size;
   68     int error;
   69 
   70     if (((a_out->a_magic >> 16) & 0xff) != 0x64)
   71         return -1;
   72 
   73     /*
   74      * Set file/virtual offset based on a.out variant.
   75      */
   76     switch ((int)(a_out->a_magic & 0xffff)) {
   77     case 0413:
   78         virtual_offset = 0;
   79         file_offset = 1024;
   80         break;
   81     case 0314:
   82         virtual_offset = 4096;
   83         file_offset = 0;
   84         break;
   85     default:
   86         return (-1);
   87     }
   88     bss_size = round_page(a_out->a_bss);
   89 #ifdef DEBUG
   90     printf("imgact: text: %08x, data: %08x, bss: %08x\n", a_out->a_text, a_out->a_data, bss_size);
   91 #endif
   92 
   93     /*
   94      * Check various fields in header for validity/bounds.
   95      */
   96     if (a_out->a_entry < virtual_offset ||
   97         a_out->a_entry >= virtual_offset + a_out->a_text ||
   98         a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
   99         return (-1);
  100 
  101     /* text + data can't exceed file size */
  102     if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
  103         return (EFAULT);
  104     /*
  105      * text/data/bss must not exceed limits
  106      */
  107     if (a_out->a_text > maxtsiz ||
  108         a_out->a_data + bss_size > imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur)
  109         return (ENOMEM);
  110 
  111     /* copy in arguments and/or environment from old process */
  112     error = exec_extract_strings(imgp);
  113     if (error)
  114         return (error);
  115 
  116     /*
  117      * Destroy old process VM and create a new one (with a new stack)
  118      */
  119     exec_new_vmspace(imgp);
  120     vmspace = imgp->proc->p_vmspace;
  121 
  122     /*
  123      * Check if file_offset page aligned,.
  124      * Currently we cannot handle misalinged file offsets,
  125      * and so we read in the entire image (what a waste).
  126      */
  127     if (file_offset & PAGE_MASK) {
  128 #ifdef DEBUG
  129         printf("imgact: Non page aligned binary %d\n", file_offset);
  130 #endif
  131         /*
  132          * Map text+data+bss read/write/execute
  133          */
  134         vmaddr = virtual_offset;
  135         error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
  136                             a_out->a_text + a_out->a_data + bss_size, FALSE,
  137                             VM_PROT_ALL, VM_PROT_ALL, 0);
  138         if (error)
  139             return error;
  140 
  141         error = vm_mmap(kernel_map, &buffer,
  142                         round_page(a_out->a_text + a_out->a_data + file_offset),
  143                         VM_PROT_READ, VM_PROT_READ, 0,
  144                         (caddr_t) imgp->vp, trunc_page(file_offset));
  145         if (error)
  146             return error;
  147 
  148         error = copyout((caddr_t)(buffer + file_offset), (caddr_t)vmaddr, 
  149                         a_out->a_text + a_out->a_data);
  150 
  151         vm_map_remove(kernel_map, buffer,
  152                       buffer + round_page(a_out->a_text + a_out->a_data + file_offset));
  153 
  154         if (error)
  155             return error;
  156 
  157         /*
  158          * remove write enable on the 'text' part
  159          */
  160         error = vm_map_protect(&vmspace->vm_map,
  161                                vmaddr,
  162                                vmaddr + a_out->a_text,
  163                                VM_PROT_EXECUTE|VM_PROT_READ,
  164                                TRUE);
  165         if (error)
  166             return error;
  167     }
  168     else {
  169 #ifdef DEBUG
  170         printf("imgact: Page aligned binary %d\n", file_offset);
  171 #endif
  172         /*
  173          * Map text+data read/execute
  174          */
  175         vmaddr = virtual_offset;
  176         error = vm_mmap(&vmspace->vm_map, &vmaddr,
  177                         a_out->a_text + a_out->a_data,
  178                         VM_PROT_READ | VM_PROT_EXECUTE,
  179                         VM_PROT_ALL,
  180                         MAP_PRIVATE | MAP_FIXED,
  181                         (caddr_t)imgp->vp, file_offset);
  182         if (error)
  183             return (error);
  184     
  185 #ifdef DEBUG
  186         printf("imgact: startaddr=%08x, length=%08x\n", vmaddr, a_out->a_text + a_out->a_data);
  187 #endif
  188         /*
  189          * allow read/write of data
  190          */
  191         error = vm_map_protect(&vmspace->vm_map,
  192                                vmaddr + a_out->a_text,
  193                                vmaddr + a_out->a_text + a_out->a_data,
  194                                VM_PROT_ALL,
  195                                FALSE);
  196         if (error)
  197             return (error);
  198     
  199         /*
  200          * Allocate anon demand-zeroed area for uninitialized data
  201          */
  202         if (bss_size != 0) {
  203             vmaddr = virtual_offset + a_out->a_text + a_out->a_data;
  204             error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr, 
  205                                 bss_size, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
  206             if (error)
  207                 return (error);
  208 #ifdef DEBUG
  209             printf("imgact: bssaddr=%08x, length=%08x\n", vmaddr, bss_size);
  210 #endif
  211 
  212         }
  213         /* Indicate that this file should not be modified */
  214         imgp->vp->v_flag |= VTEXT;
  215     }
  216     /* Fill in process VM information */
  217     vmspace->vm_tsize = round_page(a_out->a_text) >> PAGE_SHIFT;
  218     vmspace->vm_dsize = round_page(a_out->a_data + bss_size) >> PAGE_SHIFT;
  219     vmspace->vm_taddr = (caddr_t)virtual_offset;
  220     vmspace->vm_daddr = (caddr_t)virtual_offset + a_out->a_text;
  221 
  222     /* Fill in image_params */
  223     imgp->interpreted = 0;
  224     imgp->entry_addr = a_out->a_entry;
  225     
  226     imgp->proc->p_sysent = &svr4_sysvec;
  227     return (0);
  228 }
  229 
  230 /*
  231  * Tell kern_execve.c about it, with a little help from the linker.
  232  */
  233 struct execsw svr4_execsw = { exec_svr4_imgact, "svr4 ELF" };
  234 EXEC_SET(execsw_set, svr4_execsw);
  235 

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