imgact_aout.c

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    1 /*
    2  * Copyright (c) 1993, David Greenman
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: src/sys/kern/imgact_aout.c,v 1.59.2.5 2001/11/03 01:41:08 ps Exp $
   27  * $DragonFly: src/sys/kern/imgact_aout.c,v 1.14 2007/02/01 10:33:25 corecode Exp $
   28  */
   29 
   30 #include <sys/param.h>
   31 #include <sys/resourcevar.h>
   32 #include <sys/exec.h>
   33 #include <sys/fcntl.h>
   34 #include <sys/imgact.h>
   35 #include <sys/imgact_aout.h>
   36 #include <sys/kernel.h>
   37 #include <sys/malloc.h>
   38 #include <sys/systm.h>
   39 #include <sys/proc.h>
   40 #include <sys/namei.h>
   41 #include <sys/pioctl.h>
   42 #include <sys/signalvar.h>
   43 #include <sys/stat.h>
   44 #include <sys/sysent.h>
   45 #include <sys/syscall.h>
   46 #include <sys/vnode.h>
   47 #include <machine/md_var.h>
   48 
   49 #include <vm/vm.h>
   50 #include <vm/vm_param.h>
   51 #include <sys/lock.h>
   52 #include <vm/pmap.h>
   53 #include <vm/vm_map.h>
   54 #include <vm/vm_object.h>
   55 #include <sys/user.h>
   56 
   57 static int      exec_aout_imgact (struct image_params *imgp);
   58 
   59 struct sysentvec aout_sysvec = {
   60         SYS_MAXSYSCALL,
   61         sysent,
   62         -1,
   63         0,
   64         0,
   65         0,
   66         0,
   67         0,
   68         0,
   69         sendsig,
   70         sigcode,
   71         &szsigcode,
   72         0,
   73         "FreeBSD a.out",
   74         NULL,
   75         NULL,
   76         MINSIGSTKSZ
   77 };
   78 
   79 static int
   80 exec_aout_imgact(struct image_params *imgp)
   81 {
   82         const struct exec *a_out = (const struct exec *) imgp->image_header;
   83         struct vmspace *vmspace;
   84         struct vnode *vp;
   85         int count;
   86         vm_map_t map;
   87         vm_object_t object;
   88         vm_offset_t text_end, data_end;
   89         unsigned long virtual_offset;
   90         unsigned long file_offset;
   91         unsigned long bss_size;
   92         int error;
   93 
   94         /*
   95          * Linux and *BSD binaries look very much alike,
   96          * only the machine id is different:
   97          * 0x64 for Linux, 0x86 for *BSD, 0x00 for BSDI.
   98          * NetBSD is in network byte order.. ugh.
   99          */
  100         if (((a_out->a_magic >> 16) & 0xff) != 0x86 &&
  101             ((a_out->a_magic >> 16) & 0xff) != 0 &&
  102             ((((int)ntohl(a_out->a_magic)) >> 16) & 0xff) != 0x86)
  103                 return -1;
  104 
  105         /*
  106          * Set file/virtual offset based on a.out variant.
  107          *      We do two cases: host byte order and network byte order
  108          *      (for NetBSD compatibility)
  109          */
  110         switch ((int)(a_out->a_magic & 0xffff)) {
  111         case ZMAGIC:
  112                 virtual_offset = 0;
  113                 if (a_out->a_text) {
  114                         file_offset = PAGE_SIZE;
  115                 } else {
  116                         /* Bill's "screwball mode" */
  117                         file_offset = 0;
  118                 }
  119                 break;
  120         case QMAGIC:
  121                 virtual_offset = PAGE_SIZE;
  122                 file_offset = 0;
  123                 /* Pass PS_STRINGS for BSD/OS binaries only. */
  124                 if (N_GETMID(*a_out) == MID_ZERO)
  125                         imgp->ps_strings = PS_STRINGS;
  126                 break;
  127         default:
  128                 /* NetBSD compatibility */
  129                 switch ((int)(ntohl(a_out->a_magic) & 0xffff)) {
  130                 case ZMAGIC:
  131                 case QMAGIC:
  132                         virtual_offset = PAGE_SIZE;
  133                         file_offset = 0;
  134                         break;
  135                 default:
  136                         return (-1);
  137                 }
  138         }
  139 
  140         bss_size = roundup(a_out->a_bss, PAGE_SIZE);
  141 
  142         /*
  143          * Check various fields in header for validity/bounds.
  144          */
  145         if (/* entry point must lay with text region */
  146             a_out->a_entry < virtual_offset ||
  147             a_out->a_entry >= virtual_offset + a_out->a_text ||
  148 
  149             /* text and data size must each be page rounded */
  150             a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
  151                 return (-1);
  152 
  153         /* text + data can't exceed file size */
  154         if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
  155                 return (EFAULT);
  156 
  157         /*
  158          * text/data/bss must not exceed limits
  159          */
  160         if (/* text can't exceed maximum text size */
  161             a_out->a_text > maxtsiz ||
  162 
  163             /* data + bss can't exceed rlimit */
  164             a_out->a_data + bss_size >
  165                 imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur)
  166                         return (ENOMEM);
  167 
  168         /*
  169          * Destroy old process VM and create a new one (with a new stack)
  170          */
  171         exec_new_vmspace(imgp, NULL);
  172 
  173         /*
  174          * The vm space can be changed by exec_new_vmspace
  175          */
  176         vmspace = imgp->proc->p_vmspace;
  177 
  178         vp = imgp->vp;
  179         map = &vmspace->vm_map;
  180         count = vm_map_entry_reserve(MAP_RESERVE_COUNT);
  181         vm_map_lock(map);
  182         object = vp->v_object;
  183         vm_object_hold(object);
  184         vm_object_reference_locked(object);
  185 
  186         text_end = virtual_offset + a_out->a_text;
  187         error = vm_map_insert(map, &count, object,
  188                 file_offset,
  189                 virtual_offset, text_end,
  190                 VM_MAPTYPE_NORMAL,
  191                 VM_PROT_READ | VM_PROT_EXECUTE, VM_PROT_ALL,
  192                 MAP_COPY_ON_WRITE | MAP_PREFAULT | MAP_PREFAULT_RELOCK);
  193 
  194         if (error) {
  195                 vm_object_drop(object);
  196                 vm_map_unlock(map);
  197                 vm_map_entry_release(count);
  198                 return (error);
  199         }
  200 
  201         data_end = text_end + a_out->a_data;
  202         if (a_out->a_data) {
  203                 vm_object_reference_locked(object);
  204                 error = vm_map_insert(map, &count, object,
  205                         file_offset + a_out->a_text,
  206                         text_end, data_end,
  207                         VM_MAPTYPE_NORMAL,
  208                         VM_PROT_ALL, VM_PROT_ALL,
  209                         MAP_COPY_ON_WRITE | MAP_PREFAULT | MAP_PREFAULT_RELOCK);
  210                 if (error) {
  211                         vm_object_drop(object);
  212                         vm_map_unlock(map);
  213                         vm_map_entry_release(count);
  214                         return (error);
  215                 }
  216         }
  217         vm_object_drop(object);
  218 
  219         if (bss_size) {
  220                 error = vm_map_insert(map, &count, NULL, 0,
  221                         data_end, data_end + bss_size,
  222                         VM_MAPTYPE_NORMAL,
  223                         VM_PROT_ALL, VM_PROT_ALL,
  224                         0);
  225                 if (error) {
  226                         vm_map_unlock(map);
  227                         vm_map_entry_release(count);
  228                         return (error);
  229                 }
  230         }
  231         vm_map_unlock(map);
  232         vm_map_entry_release(count);
  233 
  234         /* Fill in process VM information */
  235         vmspace->vm_tsize = a_out->a_text >> PAGE_SHIFT;
  236         vmspace->vm_dsize = (a_out->a_data + bss_size) >> PAGE_SHIFT;
  237         vmspace->vm_taddr = (caddr_t) (uintptr_t) virtual_offset;
  238         vmspace->vm_daddr = (caddr_t) (uintptr_t)
  239                             (virtual_offset + a_out->a_text);
  240 
  241         /* Fill in image_params */
  242         imgp->interpreted = 0;
  243         imgp->entry_addr = a_out->a_entry;
  244 
  245         imgp->proc->p_sysent = &aout_sysvec;
  246 
  247         /* Indicate that this file should not be modified */
  248         vsetflags(imgp->vp, VTEXT);
  249 
  250         return (0);
  251 }
  252 
  253 /*
  254  * Tell kern_execve.c about it, with a little help from the linker.
  255  */
  256 static struct execsw aout_execsw = { exec_aout_imgact, "a.out" };
  257 EXEC_SET(aout, aout_execsw);

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FreeBSD/Linux Kernel Cross Reference sys/kern/imgact_aout.c

FreeBSD/Linux Kernel Cross Reference
sys/kern/imgact_aout.c