imgact_linux.c

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    1 /*-
    2  * Copyright (c) 1994-1996 Søren Schmidt
    3  * All rights reserved.
    4  *
    5  * Based heavily on /sys/kern/imgact_aout.c which is:
    6  * Copyright (c) 1993, David Greenman
    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  *    in this position and unchanged.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  * 3. The name of the author may not be used to endorse or promote products
   18  *    derived from this software withough specific prior written permission
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   23  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   30  *
   31  * $FreeBSD: src/sys/i386/linux/imgact_linux.c,v 1.16.2.3 1999/09/05 08:14:10 peter Exp $
   32  */
   33 
   34 #ifndef LKM
   35 #include "opt_rlimit.h"
   36 #endif
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/resourcevar.h>
   41 #include <sys/exec.h>
   42 #include <sys/mman.h>
   43 #include <sys/imgact.h>
   44 #include <sys/imgact_aout.h>
   45 #include <sys/kernel.h>
   46 #include <sys/proc.h>
   47 #include <sys/sysent.h>
   48 #include <sys/vnode.h>
   49 
   50 #include <vm/vm.h>
   51 #include <vm/vm_kern.h>
   52 #include <vm/vm_param.h>
   53 #include <vm/pmap.h>
   54 #include <vm/lock.h>
   55 #include <vm/vm_map.h>
   56 #include <vm/vm_prot.h>
   57 #include <vm/vm_extern.h>
   58 
   59 #include <i386/linux/linux.h>
   60 #include <i386/linux/linux_proto.h>
   61 
   62 extern int      exec_linux_imgact __P((struct image_params *iparams));
   63 
   64 int
   65 exec_linux_imgact(imgp)
   66     struct image_params *imgp;
   67 {
   68     const struct exec *a_out = (const struct exec *) imgp->image_header;
   69     struct vmspace *vmspace = imgp->proc->p_vmspace;
   70     vm_offset_t vmaddr;
   71     unsigned long virtual_offset, file_offset;
   72     vm_offset_t buffer;
   73     unsigned long bss_size;
   74     int error;
   75 
   76     if (((a_out->a_magic >> 16) & 0xff) != 0x64)
   77         return -1;
   78 
   79     /*
   80      * Set file/virtual offset based on a.out variant.
   81      */
   82     switch ((int)(a_out->a_magic & 0xffff)) {
   83     case 0413:
   84         virtual_offset = 0;
   85         file_offset = 1024;
   86         break;
   87     case 0314:
   88         virtual_offset = 4096;
   89         file_offset = 0;
   90         break;
   91     default:
   92         return (-1);
   93     }
   94     bss_size = round_page(a_out->a_bss);
   95 #ifdef DEBUG
   96     printf("imgact: text: %08x, data: %08x, bss: %08x\n", a_out->a_text, a_out->a_data, bss_size);
   97 #endif
   98 
   99     /*
  100      * Check various fields in header for validity/bounds.
  101      */
  102     if (a_out->a_entry < virtual_offset ||
  103         a_out->a_entry >= virtual_offset + a_out->a_text ||
  104         a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
  105         return (-1);
  106 
  107     /* text + data can't exceed file size */
  108     if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
  109         return (EFAULT);
  110     /*
  111      * text/data/bss must not exceed limits
  112      */
  113     if (a_out->a_text > MAXTSIZ || a_out->a_data + bss_size > MAXDSIZ ||
  114         a_out->a_data+bss_size > imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur)
  115         return (ENOMEM);
  116 
  117     /* copy in arguments and/or environment from old process */
  118     error = exec_extract_strings(imgp);
  119     if (error)
  120         return (error);
  121 
  122     /*
  123      * Destroy old process VM and create a new one (with a new stack)
  124      */
  125     exec_new_vmspace(imgp);
  126 
  127     /*
  128      * Check if file_offset page aligned,.
  129      * Currently we cannot handle misalinged file offsets,
  130      * and so we read in the entire image (what a waste).
  131      */
  132     if (file_offset & PAGE_MASK) {
  133 #ifdef DEBUG
  134         printf("imgact: Non page aligned binary %d\n", file_offset);
  135 #endif
  136         /*
  137          * Map text+data+bss read/write/execute
  138          */
  139         vmaddr = virtual_offset;
  140         error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
  141                             a_out->a_text + a_out->a_data + bss_size, FALSE,
  142                             VM_PROT_ALL, VM_PROT_ALL, 0);
  143         if (error)
  144             return error;
  145 
  146         error = vm_mmap(kernel_map, &buffer,
  147                         round_page(a_out->a_text + a_out->a_data + file_offset),
  148                         VM_PROT_READ, VM_PROT_READ, 0,
  149                         (caddr_t) imgp->vp, trunc_page(file_offset));
  150         if (error)
  151             return error;
  152 
  153         error = copyout((caddr_t)(buffer + file_offset), (caddr_t)vmaddr, 
  154                         a_out->a_text + a_out->a_data);
  155 
  156         vm_map_remove(kernel_map, buffer,
  157                       buffer + round_page(a_out->a_text + a_out->a_data + file_offset));
  158 
  159         if (error)
  160             return error;
  161 
  162         /*
  163          * remove write enable on the 'text' part
  164          */
  165         error = vm_map_protect(&vmspace->vm_map,
  166                                vmaddr,
  167                                vmaddr + a_out->a_text,
  168                                VM_PROT_EXECUTE|VM_PROT_READ,
  169                                TRUE);
  170         if (error)
  171             return error;
  172     }
  173     else {
  174 #ifdef DEBUG
  175         printf("imgact: Page aligned binary %d\n", file_offset);
  176 #endif
  177         /*
  178          * Map text+data read/execute
  179          */
  180         vmaddr = virtual_offset;
  181         error = vm_mmap(&vmspace->vm_map, &vmaddr,
  182                         a_out->a_text + a_out->a_data,
  183                         VM_PROT_READ | VM_PROT_EXECUTE,
  184                         VM_PROT_ALL,
  185                         MAP_PRIVATE | MAP_FIXED,
  186                         (caddr_t)imgp->vp, file_offset);
  187         if (error)
  188             return (error);
  189     
  190 #ifdef DEBUG
  191         printf("imgact: startaddr=%08x, length=%08x\n", vmaddr, a_out->a_text + a_out->a_data);
  192 #endif
  193         /*
  194          * allow read/write of data
  195          */
  196         error = vm_map_protect(&vmspace->vm_map,
  197                                vmaddr + a_out->a_text,
  198                                vmaddr + a_out->a_text + a_out->a_data,
  199                                VM_PROT_ALL,
  200                                FALSE);
  201         if (error)
  202             return (error);
  203     
  204         /*
  205          * Allocate anon demand-zeroed area for uninitialized data
  206          */
  207         if (bss_size != 0) {
  208             vmaddr = virtual_offset + a_out->a_text + a_out->a_data;
  209             error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr, 
  210                                 bss_size, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
  211             if (error)
  212                 return (error);
  213 #ifdef DEBUG
  214             printf("imgact: bssaddr=%08x, length=%08x\n", vmaddr, bss_size);
  215 #endif
  216 
  217         }
  218         /* Indicate that this file should not be modified */
  219         imgp->vp->v_flag |= VTEXT;
  220     }
  221     /* Fill in process VM information */
  222     vmspace->vm_tsize = round_page(a_out->a_text) >> PAGE_SHIFT;
  223     vmspace->vm_dsize = round_page(a_out->a_data + bss_size) >> PAGE_SHIFT;
  224     vmspace->vm_taddr = (caddr_t)virtual_offset;
  225     vmspace->vm_daddr = (caddr_t)virtual_offset + a_out->a_text;
  226 
  227     /* Fill in image_params */
  228     imgp->interpreted = 0;
  229     imgp->entry_addr = a_out->a_entry;
  230     
  231     imgp->proc->p_sysent = &linux_sysvec;
  232     return (0);
  233 }
  234 
  235 /*
  236  * Tell kern_execve.c about it, with a little help from the linker.
  237  * Since `const' objects end up in the text segment, TEXT_SET is the
  238  * correct directive to use.
  239  */
  240 const struct execsw linux_execsw = { exec_linux_imgact, "linux a.out" };
  241 TEXT_SET(execsw_set, linux_execsw);
  242

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FreeBSD/Linux Kernel Cross Reference sys/i386/linux/imgact_linux.c

FreeBSD/Linux Kernel Cross Reference
sys/i386/linux/imgact_linux.c