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

Cache object: 2fb5629d40ed114d43f41ece112f68b4


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