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/i386/linux/imgact_linux.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) 1994-1996 Søren Schmidt
    3  * All rights reserved.
    4  *
    5  * Based heavily on /sys/kern/imgact_aout.c which is:
    6  * Copyright (c) 1993, David Greenman
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer
   13  *    in this position and unchanged.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  * 3. The name of the author may not be used to endorse or promote products
   18  *    derived from this software without specific prior written permission
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   23  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: releng/9.0/sys/i386/linux/imgact_linux.c 220373 2011-04-05 20:23:59Z trasz $");
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/exec.h>
   38 #include <sys/imgact.h>
   39 #include <sys/imgact_aout.h>
   40 #include <sys/kernel.h>
   41 #include <sys/lock.h>
   42 #include <sys/mman.h>
   43 #include <sys/mutex.h>
   44 #include <sys/proc.h>
   45 #include <sys/racct.h>
   46 #include <sys/resourcevar.h>
   47 #include <sys/vnode.h>
   48 
   49 #include <vm/vm.h>
   50 #include <vm/vm_kern.h>
   51 #include <vm/vm_param.h>
   52 #include <vm/pmap.h>
   53 #include <vm/vm_map.h>
   54 #include <vm/vm_extern.h>
   55 
   56 #include <i386/linux/linux.h>
   57 
   58 static int      exec_linux_imgact(struct image_params *iparams);
   59 
   60 static int
   61 exec_linux_imgact(struct image_params *imgp)
   62 {
   63     const struct exec *a_out = (const struct exec *) imgp->image_header;
   64     struct vmspace *vmspace;
   65     vm_offset_t vmaddr;
   66     unsigned long virtual_offset, file_offset;
   67     vm_offset_t buffer;
   68     unsigned long bss_size;
   69     int error;
   70 
   71     if (((a_out->a_magic >> 16) & 0xff) != 0x64)
   72         return -1;
   73 
   74     /*
   75      * Set file/virtual offset based on a.out variant.
   76      */
   77     switch ((int)(a_out->a_magic & 0xffff)) {
   78     case 0413:
   79         virtual_offset = 0;
   80         file_offset = 1024;
   81         break;
   82     case 0314:
   83         virtual_offset = 4096;
   84         file_offset = 0;
   85         break;
   86     default:
   87         return (-1);
   88     }
   89     bss_size = round_page(a_out->a_bss);
   90 #ifdef DEBUG
   91     printf("imgact: text: %08lx, data: %08lx, bss: %08lx\n",
   92         (u_long)a_out->a_text, (u_long)a_out->a_data, bss_size);
   93 #endif
   94 
   95     /*
   96      * Check various fields in header for validity/bounds.
   97      */
   98     if (a_out->a_entry < virtual_offset ||
   99         a_out->a_entry >= virtual_offset + a_out->a_text ||
  100         a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
  101         return (-1);
  102 
  103     /* text + data can't exceed file size */
  104     if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
  105         return (EFAULT);
  106     /*
  107      * text/data/bss must not exceed limits
  108      */
  109     PROC_LOCK(imgp->proc);
  110     if (a_out->a_text > maxtsiz ||
  111         a_out->a_data + bss_size > lim_cur(imgp->proc, RLIMIT_DATA) ||
  112         racct_set(imgp->proc, RACCT_DATA, a_out->a_data + bss_size) != 0) {
  113         PROC_UNLOCK(imgp->proc);
  114         return (ENOMEM);
  115     }
  116     PROC_UNLOCK(imgp->proc);
  117 
  118     VOP_UNLOCK(imgp->vp, 0);
  119 
  120     /*
  121      * Destroy old process VM and create a new one (with a new stack)
  122      */
  123     error = exec_new_vmspace(imgp, &linux_sysvec);
  124     if (error)
  125             goto fail;
  126     vmspace = imgp->proc->p_vmspace;
  127 
  128     /*
  129      * Check if file_offset page aligned,.
  130      * Currently we cannot handle misaligned file offsets,
  131      * and so we read in the entire image (what a waste).
  132      */
  133     if (file_offset & PAGE_MASK) {
  134 #ifdef DEBUG
  135         printf("imgact: Non page aligned binary %lu\n", file_offset);
  136 #endif
  137         /*
  138          * Map text+data+bss read/write/execute
  139          */
  140         vmaddr = virtual_offset;
  141         error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
  142                             a_out->a_text + a_out->a_data + bss_size, FALSE,
  143                             VM_PROT_ALL, VM_PROT_ALL, 0);
  144         if (error)
  145             goto fail;
  146 
  147         error = vm_mmap(kernel_map, &buffer,
  148                         round_page(a_out->a_text + a_out->a_data + file_offset),
  149                         VM_PROT_READ, VM_PROT_READ, 0, OBJT_VNODE,
  150                         imgp->vp, trunc_page(file_offset));
  151         if (error)
  152             goto fail;
  153 
  154         error = copyout((void *)(uintptr_t)(buffer + file_offset),
  155                         (void *)vmaddr, a_out->a_text + a_out->a_data);
  156 
  157         vm_map_remove(kernel_map, buffer,
  158                       buffer + round_page(a_out->a_text + a_out->a_data + file_offset));
  159 
  160         if (error)
  161             goto fail;
  162 
  163         /*
  164          * remove write enable on the 'text' part
  165          */
  166         error = vm_map_protect(&vmspace->vm_map,
  167                                vmaddr,
  168                                vmaddr + a_out->a_text,
  169                                VM_PROT_EXECUTE|VM_PROT_READ,
  170                                TRUE);
  171         if (error)
  172             goto fail;
  173     }
  174     else {
  175 #ifdef DEBUG
  176         printf("imgact: Page aligned binary %lu\n", file_offset);
  177 #endif
  178         /*
  179          * Map text+data read/execute
  180          */
  181         vmaddr = virtual_offset;
  182         error = vm_mmap(&vmspace->vm_map, &vmaddr,
  183                         a_out->a_text + a_out->a_data,
  184                         VM_PROT_READ | VM_PROT_EXECUTE,
  185                         VM_PROT_ALL,
  186                         MAP_PRIVATE | MAP_FIXED,
  187                         OBJT_VNODE,
  188                         imgp->vp, file_offset);
  189         if (error)
  190             goto fail;
  191 
  192 #ifdef DEBUG
  193         printf("imgact: startaddr=%08lx, length=%08lx\n",
  194             (u_long)vmaddr, (u_long)a_out->a_text + (u_long)a_out->a_data);
  195 #endif
  196         /*
  197          * allow read/write of data
  198          */
  199         error = vm_map_protect(&vmspace->vm_map,
  200                                vmaddr + a_out->a_text,
  201                                vmaddr + a_out->a_text + a_out->a_data,
  202                                VM_PROT_ALL,
  203                                FALSE);
  204         if (error)
  205             goto fail;
  206 
  207         /*
  208          * Allocate anon demand-zeroed area for uninitialized data
  209          */
  210         if (bss_size != 0) {
  211             vmaddr = virtual_offset + a_out->a_text + a_out->a_data;
  212             error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
  213                                 bss_size, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
  214             if (error)
  215                 goto fail;
  216 #ifdef DEBUG
  217             printf("imgact: bssaddr=%08lx, length=%08lx\n",
  218                 (u_long)vmaddr, bss_size);
  219 #endif
  220 
  221         }
  222     }
  223     /* Fill in process VM information */
  224     vmspace->vm_tsize = round_page(a_out->a_text) >> PAGE_SHIFT;
  225     vmspace->vm_dsize = round_page(a_out->a_data + bss_size) >> PAGE_SHIFT;
  226     vmspace->vm_taddr = (caddr_t)(void *)(uintptr_t)virtual_offset;
  227     vmspace->vm_daddr = (caddr_t)(void *)(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 = &linux_sysvec;
  235 
  236 fail:
  237     vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
  238     return (error);
  239 }
  240 
  241 /*
  242  * Tell kern_execve.c about it, with a little help from the linker.
  243  */
  244 static struct execsw linux_execsw = { exec_linux_imgact, "linux a.out" };
  245 EXEC_SET(linuxaout, linux_execsw);

Cache object: f35956924ae9a57b0d1e177aad9ffc8c


[ 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.