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 without 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 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD$");
   35 
   36 #include <sys/param.h>
   37 #include <sys/systm.h>
   38 #include <sys/exec.h>
   39 #include <sys/imgact.h>
   40 #include <sys/imgact_aout.h>
   41 #include <sys/kernel.h>
   42 #include <sys/lock.h>
   43 #include <sys/mman.h>
   44 #include <sys/mutex.h>
   45 #include <sys/proc.h>
   46 #include <sys/resourcevar.h>
   47 #include <sys/vnode.h>
   48 
   49 #include <vm/vm.h>
   50 #include <vm/vm_kern.h>
   51 #include <vm/vm_param.h>
   52 #include <vm/pmap.h>
   53 #include <vm/vm_map.h>
   54 #include <vm/vm_extern.h>
   55 
   56 #include <compat/svr4/svr4.h>
   57 
   58 static int      exec_svr4_imgact(struct image_params *iparams);
   59 
   60 static int
   61 exec_svr4_imgact(imgp)
   62     struct image_params *imgp;
   63 {
   64     const struct exec *a_out = (const struct exec *) imgp->image_header;
   65     struct vmspace *vmspace;
   66     vm_offset_t vmaddr;
   67     unsigned long virtual_offset, file_offset;
   68     vm_offset_t buffer;
   69     unsigned long bss_size;
   70     int error;
   71     struct thread *td = curthread;
   72 
   73     if (((a_out->a_magic >> 16) & 0xff) != 0x64)
   74         return -1;
   75 
   76     /*
   77      * Set file/virtual offset based on a.out variant.
   78      */
   79     switch ((int)(a_out->a_magic & 0xffff)) {
   80     case 0413:
   81         virtual_offset = 0;
   82         file_offset = 1024;
   83         break;
   84     case 0314:
   85         virtual_offset = 4096;
   86         file_offset = 0;
   87         break;
   88     default:
   89         return (-1);
   90     }
   91     bss_size = round_page(a_out->a_bss);
   92 #ifdef DEBUG
   93     printf("imgact: text: %08lx, data: %08lx, bss: %08lx\n", (u_long)a_out->a_text, (u_long)a_out->a_data, bss_size);
   94 #endif
   95 
   96     /*
   97      * Check various fields in header for validity/bounds.
   98      */
   99     if (a_out->a_entry < virtual_offset ||
  100         a_out->a_entry >= virtual_offset + a_out->a_text ||
  101         a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
  102         return (-1);
  103 
  104     /* text + data can't exceed file size */
  105     if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
  106         return (EFAULT);
  107     /*
  108      * text/data/bss must not exceed limits
  109      */
  110     PROC_LOCK(imgp->proc);
  111     if (a_out->a_text > maxtsiz ||
  112         a_out->a_data + bss_size > lim_cur(imgp->proc, RLIMIT_DATA)) {
  113         PROC_UNLOCK(imgp->proc);
  114         return (ENOMEM);
  115     }
  116     PROC_UNLOCK(imgp->proc);
  117 
  118     VOP_UNLOCK(imgp->vp, 0, td);
  119 
  120     /* copy in arguments and/or environment from old process */
  121     error = exec_extract_strings(imgp);
  122     if (error)
  123         goto fail;
  124 
  125     /*
  126      * Destroy old process VM and create a new one (with a new stack)
  127      */
  128     exec_new_vmspace(imgp, &svr4_sysvec);
  129     vmspace = imgp->proc->p_vmspace;
  130 
  131     /*
  132      * Check if file_offset page aligned,.
  133      * Currently we cannot handle misalinged file offsets,
  134      * and so we read in the entire image (what a waste).
  135      */
  136     if (file_offset & PAGE_MASK) {
  137 #ifdef DEBUG
  138         printf("imgact: Non page aligned binary %lu\n", file_offset);
  139 #endif
  140         /*
  141          * Map text+data+bss read/write/execute
  142          */
  143         vmaddr = virtual_offset;
  144         error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
  145                             a_out->a_text + a_out->a_data + bss_size, FALSE,
  146                             VM_PROT_ALL, VM_PROT_ALL, 0);
  147         if (error)
  148             goto fail;
  149 
  150         error = vm_mmap(kernel_map, &buffer,
  151                         round_page(a_out->a_text + a_out->a_data + file_offset),
  152                         VM_PROT_READ, VM_PROT_READ, 0,
  153                         (caddr_t) imgp->vp, trunc_page(file_offset));
  154         if (error)
  155             goto fail;
  156 
  157         error = copyout((caddr_t)(buffer + file_offset), (caddr_t)vmaddr, 
  158                         a_out->a_text + a_out->a_data);
  159 
  160         vm_map_remove(kernel_map, buffer,
  161                       buffer + round_page(a_out->a_text + a_out->a_data + file_offset));
  162 
  163         if (error)
  164             goto fail;
  165 
  166         /*
  167          * remove write enable on the 'text' part
  168          */
  169         error = vm_map_protect(&vmspace->vm_map,
  170                                vmaddr,
  171                                vmaddr + a_out->a_text,
  172                                VM_PROT_EXECUTE|VM_PROT_READ,
  173                                TRUE);
  174         if (error)
  175             goto fail;
  176     }
  177     else {
  178 #ifdef DEBUG
  179         printf("imgact: Page aligned binary %lu\n", file_offset);
  180 #endif
  181         /*
  182          * Map text+data read/execute
  183          */
  184         vmaddr = virtual_offset;
  185         error = vm_mmap(&vmspace->vm_map, &vmaddr,
  186                         a_out->a_text + a_out->a_data,
  187                         VM_PROT_READ | VM_PROT_EXECUTE,
  188                         VM_PROT_ALL,
  189                         MAP_PRIVATE | MAP_FIXED,
  190                         (caddr_t)imgp->vp, file_offset);
  191         if (error)
  192             goto fail;
  193     
  194 #ifdef DEBUG
  195         printf("imgact: startaddr=%08lx, length=%08lx\n", (u_long)vmaddr,
  196             (u_long)a_out->a_text + a_out->a_data);
  197 #endif
  198         /*
  199          * allow read/write of data
  200          */
  201         error = vm_map_protect(&vmspace->vm_map,
  202                                vmaddr + a_out->a_text,
  203                                vmaddr + a_out->a_text + a_out->a_data,
  204                                VM_PROT_ALL,
  205                                FALSE);
  206         if (error)
  207             goto fail;
  208     
  209         /*
  210          * Allocate anon demand-zeroed area for uninitialized data
  211          */
  212         if (bss_size != 0) {
  213             vmaddr = virtual_offset + a_out->a_text + a_out->a_data;
  214             error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr, 
  215                                 bss_size, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
  216             if (error)
  217                 goto fail;
  218 #ifdef DEBUG
  219             printf("imgact: bssaddr=%08lx, length=%08lx\n",
  220                 (u_long)vmaddr, bss_size);
  221 #endif
  222 
  223         }
  224     }
  225     /* Fill in process VM information */
  226     vmspace->vm_tsize = round_page(a_out->a_text) >> PAGE_SHIFT;
  227     vmspace->vm_dsize = round_page(a_out->a_data + bss_size) >> PAGE_SHIFT;
  228     vmspace->vm_taddr = (caddr_t)virtual_offset;
  229     vmspace->vm_daddr = (caddr_t)virtual_offset + a_out->a_text;
  230 
  231     /* Fill in image_params */
  232     imgp->interpreted = 0;
  233     imgp->entry_addr = a_out->a_entry;
  234     
  235     imgp->proc->p_sysent = &svr4_sysvec;
  236 fail:
  237     vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY, td);
  238     return (error);
  239 }
  240 
  241 /*
  242  * Tell kern_execve.c about it, with a little help from the linker.
  243  */
  244 struct execsw svr4_execsw = { exec_svr4_imgact, "svr4 ELF" };
  245 EXEC_SET(execsw_set, svr4_execsw);
  246

Cache object: 63d21878c331b3acf76c3f5c7ac0254e

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

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