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 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/5.4/sys/kern/imgact_aout.c 145335 2005-04-20 19:11:07Z cvs2svn $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/exec.h>
   32 #include <sys/imgact.h>
   33 #include <sys/imgact_aout.h>
   34 #include <sys/kernel.h>
   35 #include <sys/lock.h>
   36 #include <sys/malloc.h>
   37 #include <sys/mutex.h>
   38 #include <sys/proc.h>
   39 #include <sys/resourcevar.h>
   40 #include <sys/signalvar.h>
   41 #include <sys/syscall.h>
   42 #include <sys/sysent.h>
   43 #include <sys/systm.h>
   44 #include <sys/vnode.h>
   45 
   46 #include <machine/frame.h>
   47 #include <machine/md_var.h>
   48 
   49 #include <vm/vm.h>
   50 #include <vm/pmap.h>
   51 #include <vm/vm_map.h>
   52 #include <vm/vm_object.h>
   53 #include <vm/vm_param.h>
   54 
   55 static int      exec_aout_imgact(struct image_params *imgp);
   56 static int      aout_fixup(register_t **stack_base, struct image_params *imgp);
   57 
   58 struct sysentvec aout_sysvec = {
   59         SYS_MAXSYSCALL,
   60         sysent,
   61         0,
   62         0,
   63         NULL,
   64         0,
   65         NULL,
   66         NULL,
   67         aout_fixup,
   68         sendsig,
   69         sigcode,
   70         &szsigcode,
   71         NULL,
   72         "FreeBSD a.out",
   73         NULL,
   74         NULL,
   75         MINSIGSTKSZ,
   76         PAGE_SIZE,
   77         VM_MIN_ADDRESS,
   78         VM_MAXUSER_ADDRESS,
   79         USRSTACK,
   80         PS_STRINGS,
   81         VM_PROT_ALL,
   82         exec_copyout_strings,
   83         exec_setregs,
   84         NULL
   85 };
   86 
   87 static int
   88 aout_fixup(stack_base, imgp)
   89         register_t **stack_base;
   90         struct image_params *imgp;
   91 {
   92 
   93         return (suword(--(*stack_base), imgp->argc));
   94 }
   95 
   96 static int
   97 exec_aout_imgact(imgp)
   98         struct image_params *imgp;
   99 {
  100         const struct exec *a_out = (const struct exec *) imgp->image_header;
  101         struct vmspace *vmspace;
  102         struct vnode *vp;
  103         vm_map_t map;
  104         vm_object_t object;
  105         vm_offset_t text_end, data_end;
  106         unsigned long virtual_offset;
  107         unsigned long file_offset;
  108         unsigned long bss_size;
  109         int error;
  110 
  111         GIANT_REQUIRED;
  112 
  113         /*
  114          * Linux and *BSD binaries look very much alike,
  115          * only the machine id is different:
  116          * 0x64 for Linux, 0x86 for *BSD, 0x00 for BSDI.
  117          * NetBSD is in network byte order.. ugh.
  118          */
  119         if (((a_out->a_magic >> 16) & 0xff) != 0x86 &&
  120             ((a_out->a_magic >> 16) & 0xff) != 0 &&
  121             ((((int)ntohl(a_out->a_magic)) >> 16) & 0xff) != 0x86)
  122                 return -1;
  123 
  124         /*
  125          * Set file/virtual offset based on a.out variant.
  126          *      We do two cases: host byte order and network byte order
  127          *      (for NetBSD compatibility)
  128          */
  129         switch ((int)(a_out->a_magic & 0xffff)) {
  130         case ZMAGIC:
  131                 virtual_offset = 0;
  132                 if (a_out->a_text) {
  133                         file_offset = PAGE_SIZE;
  134                 } else {
  135                         /* Bill's "screwball mode" */
  136                         file_offset = 0;
  137                 }
  138                 break;
  139         case QMAGIC:
  140                 virtual_offset = PAGE_SIZE;
  141                 file_offset = 0;
  142                 /* Pass PS_STRINGS for BSD/OS binaries only. */
  143                 if (N_GETMID(*a_out) == MID_ZERO)
  144                         imgp->ps_strings = aout_sysvec.sv_psstrings;
  145                 break;
  146         default:
  147                 /* NetBSD compatibility */
  148                 switch ((int)(ntohl(a_out->a_magic) & 0xffff)) {
  149                 case ZMAGIC:
  150                 case QMAGIC:
  151                         virtual_offset = PAGE_SIZE;
  152                         file_offset = 0;
  153                         break;
  154                 default:
  155                         return (-1);
  156                 }
  157         }
  158 
  159         bss_size = roundup(a_out->a_bss, PAGE_SIZE);
  160 
  161         /*
  162          * Check various fields in header for validity/bounds.
  163          */
  164         if (/* entry point must lay with text region */
  165             a_out->a_entry < virtual_offset ||
  166             a_out->a_entry >= virtual_offset + a_out->a_text ||
  167 
  168             /* text and data size must each be page rounded */
  169             a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
  170                 return (-1);
  171 
  172         /* text + data can't exceed file size */
  173         if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
  174                 return (EFAULT);
  175 
  176         /*
  177          * text/data/bss must not exceed limits
  178          */
  179         PROC_LOCK(imgp->proc);
  180         if (/* text can't exceed maximum text size */
  181             a_out->a_text > maxtsiz ||
  182 
  183             /* data + bss can't exceed rlimit */
  184             a_out->a_data + bss_size > lim_cur(imgp->proc, RLIMIT_DATA)) {
  185                         PROC_UNLOCK(imgp->proc);
  186                         return (ENOMEM);
  187         }
  188         PROC_UNLOCK(imgp->proc);
  189 
  190         /* copy in arguments and/or environment from old process */
  191         error = exec_extract_strings(imgp);
  192         if (error)
  193                 return (error);
  194 
  195         /*
  196          * Destroy old process VM and create a new one (with a new stack)
  197          */
  198         exec_new_vmspace(imgp, &aout_sysvec);
  199 
  200         /*
  201          * The vm space can be changed by exec_new_vmspace
  202          */
  203         vmspace = imgp->proc->p_vmspace;
  204 
  205         vp = imgp->vp;
  206         object = imgp->object;
  207         map = &vmspace->vm_map;
  208         vm_map_lock(map);
  209         vm_object_reference(object);
  210 
  211         text_end = virtual_offset + a_out->a_text;
  212         error = vm_map_insert(map, object,
  213                 file_offset,
  214                 virtual_offset, text_end,
  215                 VM_PROT_READ | VM_PROT_EXECUTE, VM_PROT_ALL,
  216                 MAP_COPY_ON_WRITE | MAP_PREFAULT);
  217         if (error) {
  218                 vm_map_unlock(map);
  219                 return (error);
  220         }
  221         data_end = text_end + a_out->a_data;
  222         if (a_out->a_data) {
  223                 vm_object_reference(object);
  224                 error = vm_map_insert(map, object,
  225                         file_offset + a_out->a_text,
  226                         text_end, data_end,
  227                         VM_PROT_ALL, VM_PROT_ALL,
  228                         MAP_COPY_ON_WRITE | MAP_PREFAULT);
  229                 if (error) {
  230                         vm_map_unlock(map);
  231                         return (error);
  232                 }
  233         }
  234 
  235         if (bss_size) {
  236                 error = vm_map_insert(map, NULL, 0,
  237                         data_end, data_end + bss_size,
  238                         VM_PROT_ALL, VM_PROT_ALL, 0);
  239                 if (error) {
  240                         vm_map_unlock(map);
  241                         return (error);
  242                 }
  243         }
  244         vm_map_unlock(map);
  245 
  246         /* Fill in process VM information */
  247         vmspace->vm_tsize = a_out->a_text >> PAGE_SHIFT;
  248         vmspace->vm_dsize = (a_out->a_data + bss_size) >> PAGE_SHIFT;
  249         vmspace->vm_taddr = (caddr_t) (uintptr_t) virtual_offset;
  250         vmspace->vm_daddr = (caddr_t) (uintptr_t)
  251                             (virtual_offset + a_out->a_text);
  252 
  253         /* Fill in image_params */
  254         imgp->interpreted = 0;
  255         imgp->entry_addr = a_out->a_entry;
  256 
  257         imgp->proc->p_sysent = &aout_sysvec;
  258 
  259         return (0);
  260 }
  261 
  262 /*
  263  * Tell kern_execve.c about it, with a little help from the linker.
  264  */
  265 static struct execsw aout_execsw = { exec_aout_imgact, "a.out" };
  266 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