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


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FreeBSD/Linux Kernel Cross Reference
sys/kern/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/5.3/sys/kern/imgact_aout.c 136588 2004-10-16 08:43:07Z 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 #include <sys/user.h>
   46 
   47 #include <machine/frame.h>
   48 #include <machine/md_var.h>
   49 
   50 #include <vm/vm.h>
   51 #include <vm/pmap.h>
   52 #include <vm/vm_map.h>
   53 #include <vm/vm_object.h>
   54 #include <vm/vm_param.h>
   55 
   56 static int      exec_aout_imgact(struct image_params *imgp);
   57 static int      aout_fixup(register_t **stack_base, struct image_params *imgp);
   58 
   59 struct sysentvec aout_sysvec = {
   60         SYS_MAXSYSCALL,
   61         sysent,
   62         0,
   63         0,
   64         NULL,
   65         0,
   66         NULL,
   67         NULL,
   68         aout_fixup,
   69         sendsig,
   70         sigcode,
   71         &szsigcode,
   72         NULL,
   73         "FreeBSD a.out",
   74         aout_coredump,
   75         NULL,
   76         MINSIGSTKSZ,
   77         PAGE_SIZE,
   78         VM_MIN_ADDRESS,
   79         VM_MAXUSER_ADDRESS,
   80         USRSTACK,
   81         PS_STRINGS,
   82         VM_PROT_ALL,
   83         exec_copyout_strings,
   84         exec_setregs,
   85         NULL
   86 };
   87 
   88 static int
   89 aout_fixup(stack_base, imgp)
   90         register_t **stack_base;
   91         struct image_params *imgp;
   92 {
   93 
   94         return (suword(--(*stack_base), imgp->argc));
   95 }
   96 
   97 static int
   98 exec_aout_imgact(imgp)
   99         struct image_params *imgp;
  100 {
  101         const struct exec *a_out = (const struct exec *) imgp->image_header;
  102         struct vmspace *vmspace;
  103         struct vnode *vp;
  104         vm_map_t map;
  105         vm_object_t object;
  106         vm_offset_t text_end, data_end;
  107         unsigned long virtual_offset;
  108         unsigned long file_offset;
  109         unsigned long bss_size;
  110         int error;
  111 
  112         GIANT_REQUIRED;
  113 
  114         /*
  115          * Linux and *BSD binaries look very much alike,
  116          * only the machine id is different:
  117          * 0x64 for Linux, 0x86 for *BSD, 0x00 for BSDI.
  118          * NetBSD is in network byte order.. ugh.
  119          */
  120         if (((a_out->a_magic >> 16) & 0xff) != 0x86 &&
  121             ((a_out->a_magic >> 16) & 0xff) != 0 &&
  122             ((((int)ntohl(a_out->a_magic)) >> 16) & 0xff) != 0x86)
  123                 return -1;
  124 
  125         /*
  126          * Set file/virtual offset based on a.out variant.
  127          *      We do two cases: host byte order and network byte order
  128          *      (for NetBSD compatibility)
  129          */
  130         switch ((int)(a_out->a_magic & 0xffff)) {
  131         case ZMAGIC:
  132                 virtual_offset = 0;
  133                 if (a_out->a_text) {
  134                         file_offset = PAGE_SIZE;
  135                 } else {
  136                         /* Bill's "screwball mode" */
  137                         file_offset = 0;
  138                 }
  139                 break;
  140         case QMAGIC:
  141                 virtual_offset = PAGE_SIZE;
  142                 file_offset = 0;
  143                 /* Pass PS_STRINGS for BSD/OS binaries only. */
  144                 if (N_GETMID(*a_out) == MID_ZERO)
  145                         imgp->ps_strings = aout_sysvec.sv_psstrings;
  146                 break;
  147         default:
  148                 /* NetBSD compatibility */
  149                 switch ((int)(ntohl(a_out->a_magic) & 0xffff)) {
  150                 case ZMAGIC:
  151                 case QMAGIC:
  152                         virtual_offset = PAGE_SIZE;
  153                         file_offset = 0;
  154                         break;
  155                 default:
  156                         return (-1);
  157                 }
  158         }
  159 
  160         bss_size = roundup(a_out->a_bss, PAGE_SIZE);
  161 
  162         /*
  163          * Check various fields in header for validity/bounds.
  164          */
  165         if (/* entry point must lay with text region */
  166             a_out->a_entry < virtual_offset ||
  167             a_out->a_entry >= virtual_offset + a_out->a_text ||
  168 
  169             /* text and data size must each be page rounded */
  170             a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
  171                 return (-1);
  172 
  173         /* text + data can't exceed file size */
  174         if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
  175                 return (EFAULT);
  176 
  177         /*
  178          * text/data/bss must not exceed limits
  179          */
  180         PROC_LOCK(imgp->proc);
  181         if (/* text can't exceed maximum text size */
  182             a_out->a_text > maxtsiz ||
  183 
  184             /* data + bss can't exceed rlimit */
  185             a_out->a_data + bss_size > lim_cur(imgp->proc, RLIMIT_DATA)) {
  186                         PROC_UNLOCK(imgp->proc);
  187                         return (ENOMEM);
  188         }
  189         PROC_UNLOCK(imgp->proc);
  190 
  191         /* copy in arguments and/or environment from old process */
  192         error = exec_extract_strings(imgp);
  193         if (error)
  194                 return (error);
  195 
  196         /*
  197          * Destroy old process VM and create a new one (with a new stack)
  198          */
  199         exec_new_vmspace(imgp, &aout_sysvec);
  200 
  201         /*
  202          * The vm space can be changed by exec_new_vmspace
  203          */
  204         vmspace = imgp->proc->p_vmspace;
  205 
  206         vp = imgp->vp;
  207         object = imgp->object;
  208         map = &vmspace->vm_map;
  209         vm_map_lock(map);
  210         vm_object_reference(object);
  211 
  212         text_end = virtual_offset + a_out->a_text;
  213         error = vm_map_insert(map, object,
  214                 file_offset,
  215                 virtual_offset, text_end,
  216                 VM_PROT_READ | VM_PROT_EXECUTE, VM_PROT_ALL,
  217                 MAP_COPY_ON_WRITE | MAP_PREFAULT);
  218         if (error) {
  219                 vm_map_unlock(map);
  220                 return (error);
  221         }
  222         data_end = text_end + a_out->a_data;
  223         if (a_out->a_data) {
  224                 vm_object_reference(object);
  225                 error = vm_map_insert(map, object,
  226                         file_offset + a_out->a_text,
  227                         text_end, data_end,
  228                         VM_PROT_ALL, VM_PROT_ALL,
  229                         MAP_COPY_ON_WRITE | MAP_PREFAULT);
  230                 if (error) {
  231                         vm_map_unlock(map);
  232                         return (error);
  233                 }
  234         }
  235 
  236         if (bss_size) {
  237                 error = vm_map_insert(map, NULL, 0,
  238                         data_end, data_end + bss_size,
  239                         VM_PROT_ALL, VM_PROT_ALL, 0);
  240                 if (error) {
  241                         vm_map_unlock(map);
  242                         return (error);
  243                 }
  244         }
  245         vm_map_unlock(map);
  246 
  247         /* Fill in process VM information */
  248         vmspace->vm_tsize = a_out->a_text >> PAGE_SHIFT;
  249         vmspace->vm_dsize = (a_out->a_data + bss_size) >> PAGE_SHIFT;
  250         vmspace->vm_taddr = (caddr_t) (uintptr_t) virtual_offset;
  251         vmspace->vm_daddr = (caddr_t) (uintptr_t)
  252                             (virtual_offset + a_out->a_text);
  253 
  254         /* Fill in image_params */
  255         imgp->interpreted = 0;
  256         imgp->entry_addr = a_out->a_entry;
  257 
  258         imgp->proc->p_sysent = &aout_sysvec;
  259 
  260         return (0);
  261 }
  262 
  263 /*
  264  * Dump core, into a file named as described in the comments for
  265  * expand_name(), unless the process was setuid/setgid.
  266  */
  267 int
  268 aout_coredump(td, vp, limit)
  269         register struct thread *td;
  270         register struct vnode *vp;
  271         off_t limit;
  272 {
  273         struct proc *p = td->td_proc;
  274         register struct ucred *cred = td->td_ucred;
  275         register struct vmspace *vm = p->p_vmspace;
  276         char *tempuser;
  277         int error;
  278 
  279         if (ctob((uarea_pages + kstack_pages)
  280             + vm->vm_dsize + vm->vm_ssize) >= limit)
  281                 return (EFAULT);
  282         tempuser = malloc(ctob(uarea_pages + kstack_pages), M_TEMP,
  283             M_WAITOK | M_ZERO);
  284         if (tempuser == NULL)
  285                 return (ENOMEM);
  286         PROC_LOCK(p);
  287         fill_kinfo_proc(p, &p->p_uarea->u_kproc);
  288         PROC_UNLOCK(p);
  289         bcopy(p->p_uarea, tempuser, sizeof(struct user));
  290         bcopy(td->td_frame,
  291             tempuser + ctob(uarea_pages) +
  292             ((caddr_t)td->td_frame - (caddr_t)td->td_kstack),
  293             sizeof(struct trapframe));
  294         error = vn_rdwr(UIO_WRITE, vp, (caddr_t)tempuser,
  295             ctob(uarea_pages + kstack_pages),
  296             (off_t)0, UIO_SYSSPACE, IO_UNIT, cred, NOCRED,
  297             (int *)NULL, td);
  298         free(tempuser, M_TEMP);
  299         if (error == 0)
  300                 error = vn_rdwr(UIO_WRITE, vp, vm->vm_daddr,
  301                     (int)ctob(vm->vm_dsize),
  302                     (off_t)ctob(uarea_pages + kstack_pages), UIO_USERSPACE,
  303                     IO_UNIT | IO_DIRECT, cred, NOCRED, (int *) NULL, td);
  304         if (error == 0)
  305                 error = vn_rdwr_inchunks(UIO_WRITE, vp,
  306                     (caddr_t)trunc_page(p->p_sysent->sv_usrstack -
  307                     ctob(vm->vm_ssize)), round_page(ctob(vm->vm_ssize)),
  308                     (off_t)ctob(uarea_pages + kstack_pages) +
  309                         ctob(vm->vm_dsize), UIO_USERSPACE,
  310                     IO_UNIT | IO_DIRECT, cred, NOCRED, NULL, td);
  311         return (error);
  312 }
  313 
  314 /*
  315  * Tell kern_execve.c about it, with a little help from the linker.
  316  */
  317 static struct execsw aout_execsw = { exec_aout_imgact, "a.out" };
  318 EXEC_SET(aout, aout_execsw);

Cache object: 3b054996e55c1e123f24b6a3b6ac923e


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