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/5.2/sys/kern/imgact_aout.c 120422 2003-09-25 01:10:26Z peter $");
   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         mtx_assert(&Giant, MA_OWNED);
  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 >
  186                 imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur)
  187                         return (ENOMEM);
  188 
  189         /* copy in arguments and/or environment from old process */
  190         error = exec_extract_strings(imgp);
  191         if (error)
  192                 return (error);
  193 
  194         /*
  195          * Destroy old process VM and create a new one (with a new stack)
  196          */
  197         exec_new_vmspace(imgp, &aout_sysvec);
  198 
  199         /*
  200          * The vm space can be changed by exec_new_vmspace
  201          */
  202         vmspace = imgp->proc->p_vmspace;
  203 
  204         vp = imgp->vp;
  205         object = imgp->object;
  206         map = &vmspace->vm_map;
  207         vm_map_lock(map);
  208         vm_object_reference(object);
  209 
  210         text_end = virtual_offset + a_out->a_text;
  211         error = vm_map_insert(map, object,
  212                 file_offset,
  213                 virtual_offset, text_end,
  214                 VM_PROT_READ | VM_PROT_EXECUTE, VM_PROT_ALL,
  215                 MAP_COPY_ON_WRITE | MAP_PREFAULT);
  216         if (error) {
  217                 vm_map_unlock(map);
  218                 return (error);
  219         }
  220         data_end = text_end + a_out->a_data;
  221         if (a_out->a_data) {
  222                 vm_object_reference(object);
  223                 error = vm_map_insert(map, object,
  224                         file_offset + a_out->a_text,
  225                         text_end, data_end,
  226                         VM_PROT_ALL, VM_PROT_ALL,
  227                         MAP_COPY_ON_WRITE | MAP_PREFAULT);
  228                 if (error) {
  229                         vm_map_unlock(map);
  230                         return (error);
  231                 }
  232         }
  233 
  234         if (bss_size) {
  235                 error = vm_map_insert(map, NULL, 0,
  236                         data_end, data_end + bss_size,
  237                         VM_PROT_ALL, VM_PROT_ALL, 0);
  238                 if (error) {
  239                         vm_map_unlock(map);
  240                         return (error);
  241                 }
  242         }
  243         vm_map_unlock(map);
  244 
  245         /* Fill in process VM information */
  246         vmspace->vm_tsize = a_out->a_text >> PAGE_SHIFT;
  247         vmspace->vm_dsize = (a_out->a_data + bss_size) >> PAGE_SHIFT;
  248         vmspace->vm_taddr = (caddr_t) (uintptr_t) virtual_offset;
  249         vmspace->vm_daddr = (caddr_t) (uintptr_t)
  250                             (virtual_offset + a_out->a_text);
  251 
  252         /* Fill in image_params */
  253         imgp->interpreted = 0;
  254         imgp->entry_addr = a_out->a_entry;
  255 
  256         imgp->proc->p_sysent = &aout_sysvec;
  257 
  258         return (0);
  259 }
  260 
  261 /*
  262  * Dump core, into a file named as described in the comments for
  263  * expand_name(), unless the process was setuid/setgid.
  264  */
  265 int
  266 aout_coredump(td, vp, limit)
  267         register struct thread *td;
  268         register struct vnode *vp;
  269         off_t limit;
  270 {
  271         struct proc *p = td->td_proc;
  272         register struct ucred *cred = td->td_ucred;
  273         register struct vmspace *vm = p->p_vmspace;
  274         char *tempuser;
  275         int error;
  276 
  277         if (ctob((uarea_pages + kstack_pages)
  278             + vm->vm_dsize + vm->vm_ssize) >= limit)
  279                 return (EFAULT);
  280         tempuser = malloc(ctob(uarea_pages + kstack_pages), M_TEMP,
  281             M_WAITOK | M_ZERO);
  282         if (tempuser == NULL)
  283                 return (ENOMEM);
  284         PROC_LOCK(p);
  285         fill_kinfo_proc(p, &p->p_uarea->u_kproc);
  286         PROC_UNLOCK(p);
  287         bcopy(p->p_uarea, tempuser, sizeof(struct user));
  288         bcopy(td->td_frame,
  289             tempuser + ctob(uarea_pages) +
  290             ((caddr_t)td->td_frame - (caddr_t)td->td_kstack),
  291             sizeof(struct trapframe));
  292         error = vn_rdwr(UIO_WRITE, vp, (caddr_t)tempuser,
  293             ctob(uarea_pages + kstack_pages),
  294             (off_t)0, UIO_SYSSPACE, IO_UNIT, cred, NOCRED,
  295             (int *)NULL, td);
  296         free(tempuser, M_TEMP);
  297         if (error == 0)
  298                 error = vn_rdwr(UIO_WRITE, vp, vm->vm_daddr,
  299                     (int)ctob(vm->vm_dsize),
  300                     (off_t)ctob(uarea_pages + kstack_pages), UIO_USERSPACE,
  301                     IO_UNIT | IO_DIRECT, cred, NOCRED, (int *) NULL, td);
  302         if (error == 0)
  303                 error = vn_rdwr_inchunks(UIO_WRITE, vp,
  304                     (caddr_t)trunc_page(p->p_sysent->sv_usrstack -
  305                     ctob(vm->vm_ssize)), round_page(ctob(vm->vm_ssize)),
  306                     (off_t)ctob(uarea_pages + kstack_pages) +
  307                         ctob(vm->vm_dsize), UIO_USERSPACE,
  308                     IO_UNIT | IO_DIRECT, cred, NOCRED, (int *) NULL, td);
  309         return (error);
  310 }
  311 
  312 /*
  313  * Tell kern_execve.c about it, with a little help from the linker.
  314  */
  315 static struct execsw aout_execsw = { exec_aout_imgact, "a.out" };
  316 EXEC_SET(aout, aout_execsw);
Cache object: 928037694cd5ba21dff8b66a16c61ea7
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FreeBSD/Linux Kernel Cross Reference sys/kern/imgact_aout.c

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