imgact_linux.c

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    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("$FreeBSD$");
   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/resourcevar.h>
   46 #include <sys/vnode.h>
   47 
   48 #include <vm/vm.h>
   49 #include <vm/vm_kern.h>
   50 #include <vm/vm_param.h>
   51 #include <vm/pmap.h>
   52 #include <vm/vm_map.h>
   53 #include <vm/vm_extern.h>
   54 
   55 #include <i386/linux/linux.h>
   56 
   57 static int      exec_linux_imgact(struct image_params *iparams);
   58 
   59 static int
   60 exec_linux_imgact(struct image_params *imgp)
   61 {
   62     const struct exec *a_out = (const struct exec *) imgp->image_header;
   63     struct vmspace *vmspace;
   64     vm_offset_t vmaddr;
   65     unsigned long virtual_offset, file_offset;
   66     vm_offset_t buffer;
   67     unsigned long bss_size;
   68     struct thread *td = curthread;
   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         PROC_UNLOCK(imgp->proc);
  113         return (ENOMEM);
  114     }
  115     PROC_UNLOCK(imgp->proc);
  116 
  117     VOP_UNLOCK(imgp->vp, 0, td);
  118 
  119     /* copy in arguments and/or environment from old process */
  120     error = exec_extract_strings(imgp);
  121     if (error)
  122         goto fail;
  123 
  124     /*
  125      * Destroy old process VM and create a new one (with a new stack)
  126      */
  127     exec_new_vmspace(imgp, &linux_sysvec);
  128     vmspace = imgp->proc->p_vmspace;
  129 
  130     /*
  131      * Check if file_offset page aligned,.
  132      * Currently we cannot handle misalinged file offsets,
  133      * and so we read in the entire image (what a waste).
  134      */
  135     if (file_offset & PAGE_MASK) {
  136 #ifdef DEBUG
  137         printf("imgact: Non page aligned binary %lu\n", file_offset);
  138 #endif
  139         /*
  140          * Map text+data+bss read/write/execute
  141          */
  142         vmaddr = virtual_offset;
  143         error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
  144                             a_out->a_text + a_out->a_data + bss_size, FALSE,
  145                             VM_PROT_ALL, VM_PROT_ALL, 0);
  146         if (error)
  147             goto fail;
  148 
  149         error = vm_mmap(kernel_map, &buffer,
  150                         round_page(a_out->a_text + a_out->a_data + file_offset),
  151                         VM_PROT_READ, VM_PROT_READ, 0,
  152                         (caddr_t) imgp->vp, trunc_page(file_offset));
  153         if (error)
  154             goto fail;
  155 
  156         error = copyout((void *)(uintptr_t)(buffer + file_offset),
  157                         (void *)vmaddr, a_out->a_text + a_out->a_data);
  158 
  159         vm_map_remove(kernel_map, buffer,
  160                       buffer + round_page(a_out->a_text + a_out->a_data + file_offset));
  161 
  162         if (error)
  163             goto fail;
  164 
  165         /*
  166          * remove write enable on the 'text' part
  167          */
  168         error = vm_map_protect(&vmspace->vm_map,
  169                                vmaddr,
  170                                vmaddr + a_out->a_text,
  171                                VM_PROT_EXECUTE|VM_PROT_READ,
  172                                TRUE);
  173         if (error)
  174             goto fail;
  175     }
  176     else {
  177 #ifdef DEBUG
  178         printf("imgact: Page aligned binary %lu\n", file_offset);
  179 #endif
  180         /*
  181          * Map text+data read/execute
  182          */
  183         vmaddr = virtual_offset;
  184         error = vm_mmap(&vmspace->vm_map, &vmaddr,
  185                         a_out->a_text + a_out->a_data,
  186                         VM_PROT_READ | VM_PROT_EXECUTE,
  187                         VM_PROT_ALL,
  188                         MAP_PRIVATE | MAP_FIXED,
  189                         (caddr_t)imgp->vp, file_offset);
  190         if (error)
  191             goto fail;
  192 
  193 #ifdef DEBUG
  194         printf("imgact: startaddr=%08lx, length=%08lx\n",
  195             (u_long)vmaddr, (u_long)a_out->a_text + (u_long)a_out->a_data);
  196 #endif
  197         /*
  198          * allow read/write of data
  199          */
  200         error = vm_map_protect(&vmspace->vm_map,
  201                                vmaddr + a_out->a_text,
  202                                vmaddr + a_out->a_text + a_out->a_data,
  203                                VM_PROT_ALL,
  204                                FALSE);
  205         if (error)
  206             goto fail;
  207 
  208         /*
  209          * Allocate anon demand-zeroed area for uninitialized data
  210          */
  211         if (bss_size != 0) {
  212             vmaddr = virtual_offset + a_out->a_text + a_out->a_data;
  213             error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
  214                                 bss_size, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
  215             if (error)
  216                 goto fail;
  217 #ifdef DEBUG
  218             printf("imgact: bssaddr=%08lx, length=%08lx\n",
  219                 (u_long)vmaddr, bss_size);
  220 #endif
  221 
  222         }
  223         /* Indicate that this file should not be modified */
  224         mp_fixme("Unlocked v_flag access");
  225         imgp->vp->v_vflag |= VV_TEXT;
  226     }
  227     /* Fill in process VM information */
  228     vmspace->vm_tsize = round_page(a_out->a_text) >> PAGE_SHIFT;
  229     vmspace->vm_dsize = round_page(a_out->a_data + bss_size) >> PAGE_SHIFT;
  230     vmspace->vm_taddr = (caddr_t)(void *)(uintptr_t)virtual_offset;
  231     vmspace->vm_daddr = (caddr_t)(void *)(uintptr_t)
  232         (virtual_offset + a_out->a_text);
  233 
  234     /* Fill in image_params */
  235     imgp->interpreted = 0;
  236     imgp->entry_addr = a_out->a_entry;
  237 
  238     imgp->proc->p_sysent = &linux_sysvec;
  239 
  240 fail:
  241     vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY, td);
  242     return (error);
  243 }
  244 
  245 /*
  246  * Tell kern_execve.c about it, with a little help from the linker.
  247  */
  248 static struct execsw linux_execsw = { exec_linux_imgact, "linux a.out" };
  249 EXEC_SET(linuxaout, linux_execsw);

Cache object: e3d1f5b246cd8599c0681005c1316a21

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FreeBSD/Linux Kernel Cross Reference sys/i386/linux/imgact_linux.c

FreeBSD/Linux Kernel Cross Reference
sys/i386/linux/imgact_linux.c