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  * $FreeBSD: releng/5.0/sys/kern/imgact_aout.c 103767 2002-09-21 22:07:17Z jake $
   27  */
   28 
   29 #include <sys/param.h>
   30 #include <sys/exec.h>
   31 #include <sys/imgact.h>
   32 #include <sys/imgact_aout.h>
   33 #include <sys/kernel.h>
   34 #include <sys/lock.h>
   35 #include <sys/malloc.h>
   36 #include <sys/mutex.h>
   37 #include <sys/proc.h>
   38 #include <sys/resourcevar.h>
   39 #include <sys/signalvar.h>
   40 #include <sys/syscall.h>
   41 #include <sys/sysent.h>
   42 #include <sys/systm.h>
   43 #include <sys/vnode.h>
   44 #include <sys/user.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         aout_coredump,
   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 };
   85 
   86 static int
   87 aout_fixup(stack_base, imgp)
   88         register_t **stack_base;
   89         struct image_params *imgp;
   90 {
   91 
   92         return (suword(--(*stack_base), imgp->argc));
   93 }
   94 
   95 static int
   96 exec_aout_imgact(imgp)
   97         struct image_params *imgp;
   98 {
   99         const struct exec *a_out = (const struct exec *) imgp->image_header;
  100         struct vmspace *vmspace;
  101         struct vnode *vp;
  102         vm_map_t map;
  103         vm_object_t object;
  104         vm_offset_t text_end, data_end;
  105         unsigned long virtual_offset;
  106         unsigned long file_offset;
  107         unsigned long bss_size;
  108         int error;
  109 
  110         GIANT_REQUIRED;
  111 
  112         /*
  113          * Linux and *BSD binaries look very much alike,
  114          * only the machine id is different:
  115          * 0x64 for Linux, 0x86 for *BSD, 0x00 for BSDI.
  116          * NetBSD is in network byte order.. ugh.
  117          */
  118         if (((a_out->a_magic >> 16) & 0xff) != 0x86 &&
  119             ((a_out->a_magic >> 16) & 0xff) != 0 &&
  120             ((((int)ntohl(a_out->a_magic)) >> 16) & 0xff) != 0x86)
  121                 return -1;
  122 
  123         /*
  124          * Set file/virtual offset based on a.out variant.
  125          *      We do two cases: host byte order and network byte order
  126          *      (for NetBSD compatibility)
  127          */
  128         switch ((int)(a_out->a_magic & 0xffff)) {
  129         case ZMAGIC:
  130                 virtual_offset = 0;
  131                 if (a_out->a_text) {
  132                         file_offset = PAGE_SIZE;
  133                 } else {
  134                         /* Bill's "screwball mode" */
  135                         file_offset = 0;
  136                 }
  137                 break;
  138         case QMAGIC:
  139                 virtual_offset = PAGE_SIZE;
  140                 file_offset = 0;
  141                 /* Pass PS_STRINGS for BSD/OS binaries only. */
  142                 if (N_GETMID(*a_out) == MID_ZERO)
  143                         imgp->ps_strings = aout_sysvec.sv_psstrings;
  144                 break;
  145         default:
  146                 /* NetBSD compatibility */
  147                 switch ((int)(ntohl(a_out->a_magic) & 0xffff)) {
  148                 case ZMAGIC:
  149                 case QMAGIC:
  150                         virtual_offset = PAGE_SIZE;
  151                         file_offset = 0;
  152                         break;
  153                 default:
  154                         return (-1);
  155                 }
  156         }
  157 
  158         bss_size = roundup(a_out->a_bss, PAGE_SIZE);
  159 
  160         /*
  161          * Check various fields in header for validity/bounds.
  162          */
  163         if (/* entry point must lay with text region */
  164             a_out->a_entry < virtual_offset ||
  165             a_out->a_entry >= virtual_offset + a_out->a_text ||
  166 
  167             /* text and data size must each be page rounded */
  168             a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
  169                 return (-1);
  170 
  171         /* text + data can't exceed file size */
  172         if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
  173                 return (EFAULT);
  174 
  175         /*
  176          * text/data/bss must not exceed limits
  177          */
  178         mtx_assert(&Giant, MA_OWNED);
  179         if (/* text can't exceed maximum text size */
  180             a_out->a_text > maxtsiz ||
  181 
  182             /* data + bss can't exceed rlimit */
  183             a_out->a_data + bss_size >
  184                 imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur)
  185                         return (ENOMEM);
  186 
  187         /* copy in arguments and/or environment from old process */
  188         error = exec_extract_strings(imgp);
  189         if (error)
  190                 return (error);
  191 
  192         /*
  193          * Destroy old process VM and create a new one (with a new stack)
  194          */
  195         exec_new_vmspace(imgp, &aout_sysvec);
  196 
  197         /*
  198          * The vm space can be changed by exec_new_vmspace
  199          */
  200         vmspace = imgp->proc->p_vmspace;
  201 
  202         vp = imgp->vp;
  203         object = imgp->object;
  204         map = &vmspace->vm_map;
  205         vm_map_lock(map);
  206         vm_object_reference(object);
  207 
  208         text_end = virtual_offset + a_out->a_text;
  209         error = vm_map_insert(map, object,
  210                 file_offset,
  211                 virtual_offset, text_end,
  212                 VM_PROT_READ | VM_PROT_EXECUTE, VM_PROT_ALL,
  213                 MAP_COPY_ON_WRITE | MAP_PREFAULT);
  214         if (error) {
  215                 vm_map_unlock(map);
  216                 return (error);
  217         }
  218         data_end = text_end + a_out->a_data;
  219         if (a_out->a_data) {
  220                 vm_object_reference(object);
  221                 error = vm_map_insert(map, object,
  222                         file_offset + a_out->a_text,
  223                         text_end, data_end,
  224                         VM_PROT_ALL, VM_PROT_ALL,
  225                         MAP_COPY_ON_WRITE | MAP_PREFAULT);
  226                 if (error) {
  227                         vm_map_unlock(map);
  228                         return (error);
  229                 }
  230         }
  231 
  232         if (bss_size) {
  233                 error = vm_map_insert(map, NULL, 0,
  234                         data_end, data_end + bss_size,
  235                         VM_PROT_ALL, VM_PROT_ALL, 0);
  236                 if (error) {
  237                         vm_map_unlock(map);
  238                         return (error);
  239                 }
  240         }
  241         vm_map_unlock(map);
  242 
  243         /* Fill in process VM information */
  244         vmspace->vm_tsize = a_out->a_text >> PAGE_SHIFT;
  245         vmspace->vm_dsize = (a_out->a_data + bss_size) >> PAGE_SHIFT;
  246         vmspace->vm_taddr = (caddr_t) (uintptr_t) virtual_offset;
  247         vmspace->vm_daddr = (caddr_t) (uintptr_t)
  248                             (virtual_offset + a_out->a_text);
  249 
  250         /* Fill in image_params */
  251         imgp->interpreted = 0;
  252         imgp->entry_addr = a_out->a_entry;
  253 
  254         imgp->proc->p_sysent = &aout_sysvec;
  255 
  256         return (0);
  257 }
  258 
  259 /*
  260  * Dump core, into a file named as described in the comments for
  261  * expand_name(), unless the process was setuid/setgid.
  262  */
  263 int
  264 aout_coredump(td, vp, limit)
  265         register struct thread *td;
  266         register struct vnode *vp;
  267         off_t limit;
  268 {
  269         struct proc *p = td->td_proc;
  270         register struct ucred *cred = td->td_ucred;
  271         register struct vmspace *vm = p->p_vmspace;
  272         char *tempuser;
  273         int error;
  274 
  275         if (ctob((uarea_pages + kstack_pages)
  276             + vm->vm_dsize + vm->vm_ssize) >= limit)
  277                 return (EFAULT);
  278         tempuser = malloc(ctob(uarea_pages + kstack_pages), M_TEMP,
  279             M_WAITOK | M_ZERO);
  280         if (tempuser == NULL)
  281                 return (ENOMEM);
  282         PROC_LOCK(p);
  283         fill_kinfo_proc(p, &p->p_uarea->u_kproc);
  284         PROC_UNLOCK(p);
  285         bcopy(p->p_uarea, tempuser, sizeof(struct user));
  286         bcopy(td->td_frame,
  287             tempuser + ctob(uarea_pages) +
  288             ((caddr_t)td->td_frame - (caddr_t)td->td_kstack),
  289             sizeof(struct trapframe));
  290         error = vn_rdwr(UIO_WRITE, vp, (caddr_t)tempuser,
  291             ctob(uarea_pages + kstack_pages),
  292             (off_t)0, UIO_SYSSPACE, IO_UNIT, cred, NOCRED,
  293             (int *)NULL, td);
  294         free(tempuser, M_TEMP);
  295         if (error == 0)
  296                 error = vn_rdwr(UIO_WRITE, vp, vm->vm_daddr,
  297                     (int)ctob(vm->vm_dsize),
  298                     (off_t)ctob(uarea_pages + kstack_pages), UIO_USERSPACE,
  299                     IO_UNIT | IO_DIRECT, cred, NOCRED, (int *) NULL, td);
  300         if (error == 0)
  301                 error = vn_rdwr_inchunks(UIO_WRITE, vp,
  302                     (caddr_t)trunc_page(p->p_sysent->sv_usrstack -
  303                     ctob(vm->vm_ssize)), round_page(ctob(vm->vm_ssize)),
  304                     (off_t)ctob(uarea_pages + kstack_pages) +
  305                         ctob(vm->vm_dsize), UIO_USERSPACE,
  306                     IO_UNIT | IO_DIRECT, cred, NOCRED, (int *) NULL, td);
  307         return (error);
  308 }
  309 
  310 /*
  311  * Tell kern_execve.c about it, with a little help from the linker.
  312  */
  313 static struct execsw aout_execsw = { exec_aout_imgact, "a.out" };
  314 EXEC_SET(aout, aout_execsw);

Cache object: d98412d133313576137ddb428cb55c38


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