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


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

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

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
SearchContext: -  none  -  3  -  10 

    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  * $FreeBSD$
   27  */
   28 
   29 #include <sys/param.h>
   30 #include <sys/resourcevar.h>
   31 #include <sys/exec.h>
   32 #include <sys/fcntl.h>
   33 #include <sys/imgact.h>
   34 #include <sys/imgact_aout.h>
   35 #include <sys/kernel.h>
   36 #include <sys/malloc.h>
   37 #include <sys/namei.h>
   38 #include <sys/pioctl.h>
   39 #include <sys/proc.h>
   40 #include <sys/signalvar.h>
   41 #include <sys/stat.h>
   42 #include <sys/sysent.h>
   43 #include <sys/syscall.h>
   44 #include <sys/vnode.h>
   45 #include <sys/systm.h>
   46 #include <machine/md_var.h>
   47 
   48 #include <vm/vm.h>
   49 #include <vm/vm_param.h>
   50 #include <sys/lock.h>
   51 #include <vm/pmap.h>
   52 #include <vm/vm_map.h>
   53 #include <vm/vm_object.h>
   54 #include <sys/user.h>
   55 
   56 static int      exec_aout_imgact __P((struct image_params *imgp));
   57 
   58 struct sysentvec aout_sysvec = {
   59         SYS_MAXSYSCALL,
   60         sysent,
   61         0,
   62         0,
   63         0,
   64         0,
   65         0,
   66         0,
   67         0,
   68         sendsig,
   69         sigcode,
   70         &szsigcode,
   71         0,
   72         "FreeBSD a.out",
   73         aout_coredump,
   74         NULL,
   75         MINSIGSTKSZ
   76 };
   77 
   78 static int
   79 exec_aout_imgact(imgp)
   80         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         vm_map_t map;
   86         vm_object_t object;
   87         vm_offset_t text_end, data_end;
   88         unsigned long virtual_offset;
   89         unsigned long file_offset;
   90         unsigned long bss_size;
   91         int error;
   92 
   93         /*
   94          * Linux and *BSD binaries look very much alike,
   95          * only the machine id is different:
   96          * 0x64 for Linux, 0x86 for *BSD, 0x00 for BSDI.
   97          * NetBSD is in network byte order.. ugh.
   98          */
   99         if (((a_out->a_magic >> 16) & 0xff) != 0x86 &&
  100             ((a_out->a_magic >> 16) & 0xff) != 0 &&
  101             ((((int)ntohl(a_out->a_magic)) >> 16) & 0xff) != 0x86)
  102                 return -1;
  103 
  104         /*
  105          * Set file/virtual offset based on a.out variant.
  106          *      We do two cases: host byte order and network byte order
  107          *      (for NetBSD compatibility)
  108          */
  109         switch ((int)(a_out->a_magic & 0xffff)) {
  110         case ZMAGIC:
  111                 virtual_offset = 0;
  112                 if (a_out->a_text) {
  113                         file_offset = PAGE_SIZE;
  114                 } else {
  115                         /* Bill's "screwball mode" */
  116                         file_offset = 0;
  117                 }
  118                 break;
  119         case QMAGIC:
  120                 virtual_offset = PAGE_SIZE;
  121                 file_offset = 0;
  122                 /* Pass PS_STRINGS for BSD/OS binaries only. */
  123                 if (N_GETMID(*a_out) == MID_ZERO)
  124                         imgp->ps_strings = PS_STRINGS;
  125                 break;
  126         default:
  127                 /* NetBSD compatibility */
  128                 switch ((int)(ntohl(a_out->a_magic) & 0xffff)) {
  129                 case ZMAGIC:
  130                 case QMAGIC:
  131                         virtual_offset = PAGE_SIZE;
  132                         file_offset = 0;
  133                         break;
  134                 default:
  135                         return (-1);
  136                 }
  137         }
  138 
  139         bss_size = roundup(a_out->a_bss, PAGE_SIZE);
  140 
  141         /*
  142          * Check various fields in header for validity/bounds.
  143          */
  144         if (/* entry point must lay with text region */
  145             a_out->a_entry < virtual_offset ||
  146             a_out->a_entry >= virtual_offset + a_out->a_text ||
  147 
  148             /* text and data size must each be page rounded */
  149             a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
  150                 return (-1);
  151 
  152         /* text + data can't exceed file size */
  153         if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
  154                 return (EFAULT);
  155 
  156         /*
  157          * text/data/bss must not exceed limits
  158          */
  159         if (/* text can't exceed maximum text size */
  160             a_out->a_text > maxtsiz ||
  161 
  162             /* data + bss can't exceed rlimit */
  163             a_out->a_data + bss_size >
  164                 imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur)
  165                         return (ENOMEM);
  166 
  167         /* copy in arguments and/or environment from old process */
  168         error = exec_extract_strings(imgp);
  169         if (error)
  170                 return (error);
  171 
  172         /*
  173          * Destroy old process VM and create a new one (with a new stack)
  174          */
  175         exec_new_vmspace(imgp);
  176 
  177         /*
  178          * The vm space can be changed by exec_new_vmspace
  179          */
  180         vmspace = imgp->proc->p_vmspace;
  181 
  182         vp = imgp->vp;
  183         map = &vmspace->vm_map;
  184         vm_map_lock(map);
  185         VOP_GETVOBJECT(vp, &object);
  186         vm_object_reference(object);
  187 
  188         text_end = virtual_offset + a_out->a_text;
  189         error = vm_map_insert(map, object,
  190                 file_offset,
  191                 virtual_offset, text_end,
  192                 VM_PROT_READ | VM_PROT_EXECUTE, VM_PROT_ALL,
  193                 MAP_COPY_ON_WRITE | MAP_PREFAULT);
  194         if (error) {
  195                 vm_map_unlock(map);
  196                 return (error);
  197         }
  198         data_end = text_end + a_out->a_data;
  199         if (a_out->a_data) {
  200                 vm_object_reference(object);
  201                 error = vm_map_insert(map, object,
  202                         file_offset + a_out->a_text,
  203                         text_end, data_end,
  204                         VM_PROT_ALL, VM_PROT_ALL,
  205                         MAP_COPY_ON_WRITE | MAP_PREFAULT);
  206                 if (error) {
  207                         vm_map_unlock(map);
  208                         return (error);
  209                 }
  210         }
  211 
  212         if (bss_size) {
  213                 error = vm_map_insert(map, NULL, 0,
  214                         data_end, data_end + bss_size,
  215                         VM_PROT_ALL, VM_PROT_ALL, 0);
  216                 if (error) {
  217                         vm_map_unlock(map);
  218                         return (error);
  219                 }
  220         }
  221         vm_map_unlock(map);
  222 
  223         /* Fill in process VM information */
  224         vmspace->vm_tsize = a_out->a_text >> PAGE_SHIFT;
  225         vmspace->vm_dsize = (a_out->a_data + bss_size) >> PAGE_SHIFT;
  226         vmspace->vm_taddr = (caddr_t) (uintptr_t) virtual_offset;
  227         vmspace->vm_daddr = (caddr_t) (uintptr_t)
  228                             (virtual_offset + a_out->a_text);
  229 
  230         /* Fill in image_params */
  231         imgp->interpreted = 0;
  232         imgp->entry_addr = a_out->a_entry;
  233 
  234         imgp->proc->p_sysent = &aout_sysvec;
  235 
  236         /* Indicate that this file should not be modified */
  237         imgp->vp->v_flag |= VTEXT;
  238 
  239         return (0);
  240 }
  241 
  242 /*
  243  * Dump core, into a file named as described in the comments for
  244  * expand_name(), unless the process was setuid/setgid.
  245  */
  246 int
  247 aout_coredump(p, vp, limit)
  248         register struct proc *p;
  249         register struct vnode *vp;
  250         off_t limit;
  251 {
  252         register struct ucred *cred = p->p_ucred;
  253         register struct vmspace *vm = p->p_vmspace;
  254         int error;
  255 
  256         if (ctob(UPAGES + vm->vm_dsize + vm->vm_ssize) >= limit)
  257                 return (EFAULT);
  258         bcopy(p, &p->p_addr->u_kproc.kp_proc, sizeof(struct proc));
  259         fill_eproc(p, &p->p_addr->u_kproc.kp_eproc);
  260         error = cpu_coredump(p, vp, cred);
  261         if (error == 0)
  262                 error = vn_rdwr_inchunks(UIO_WRITE, vp, vm->vm_daddr,
  263                     (int)ctob(vm->vm_dsize), (off_t)ctob(UPAGES), UIO_USERSPACE,
  264                     IO_UNIT | IO_DIRECT, cred, (int *) NULL, p);
  265         if (error == 0)
  266                 error = vn_rdwr_inchunks(UIO_WRITE, vp,
  267                     (caddr_t) trunc_page(USRSTACK - ctob(vm->vm_ssize)),
  268                     round_page(ctob(vm->vm_ssize)),
  269                     (off_t)ctob(UPAGES) + ctob(vm->vm_dsize), UIO_USERSPACE,
  270                     IO_UNIT | IO_DIRECT, cred, (int *) NULL, p);
  271         return (error);
  272 }
  273 
  274 /*
  275  * Tell kern_execve.c about it, with a little help from the linker.
  276  */
  277 static struct execsw aout_execsw = { exec_aout_imgact, "a.out" };
  278 EXEC_SET(aout, aout_execsw);

Cache object: c4ac396af47695f1ad239d75809ec0e4


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.