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/compat/svr4/imgact_svr4.c

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    1 /*-
    2  * Copyright (c) 1998 Mark Newton
    3  * Copyright (c) 1994-1996 Søren Schmidt
    4  * All rights reserved.
    5  *
    6  * Based heavily on /sys/kern/imgact_aout.c which is:
    7  * Copyright (c) 1993, David Greenman
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer 
   14  *    in this position and unchanged.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. The name of the author may not be used to endorse or promote products
   19  *    derived from this software without specific prior written permission
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: releng/11.1/sys/compat/svr4/imgact_svr4.c 284215 2015-06-10 10:48:12Z mjg $");
   35 
   36 #include <sys/param.h>
   37 #include <sys/systm.h>
   38 #include <sys/exec.h>
   39 #include <sys/imgact.h>
   40 #include <sys/imgact_aout.h>
   41 #include <sys/kernel.h>
   42 #include <sys/lock.h>
   43 #include <sys/mman.h>
   44 #include <sys/mutex.h>
   45 #include <sys/proc.h>
   46 #include <sys/racct.h>
   47 #include <sys/resourcevar.h>
   48 #include <sys/vnode.h>
   49 
   50 #include <vm/vm.h>
   51 #include <vm/vm_kern.h>
   52 #include <vm/vm_param.h>
   53 #include <vm/pmap.h>
   54 #include <vm/vm_map.h>
   55 #include <vm/vm_extern.h>
   56 
   57 #include <compat/svr4/svr4.h>
   58 
   59 static int      exec_svr4_imgact(struct image_params *iparams);
   60 
   61 static int
   62 exec_svr4_imgact(imgp)
   63     struct image_params *imgp;
   64 {
   65     const struct exec *a_out = (const struct exec *) imgp->image_header;
   66     struct vmspace *vmspace;
   67     vm_offset_t vmaddr;
   68     unsigned long virtual_offset, file_offset;
   69     unsigned long bss_size;
   70     ssize_t aresid;
   71     int error;
   72 
   73     if (((a_out->a_magic >> 16) & 0xff) != 0x64)
   74         return -1;
   75 
   76     /*
   77      * Set file/virtual offset based on a.out variant.
   78      */
   79     switch ((int)(a_out->a_magic & 0xffff)) {
   80     case 0413:
   81         virtual_offset = 0;
   82         file_offset = 1024;
   83         break;
   84     case 0314:
   85         virtual_offset = 4096;
   86         file_offset = 0;
   87         break;
   88     default:
   89         return (-1);
   90     }
   91     bss_size = round_page(a_out->a_bss);
   92 #ifdef DEBUG
   93     printf("imgact: text: %08lx, data: %08lx, bss: %08lx\n", (u_long)a_out->a_text, (u_long)a_out->a_data, bss_size);
   94 #endif
   95 
   96     /*
   97      * Check various fields in header for validity/bounds.
   98      */
   99     if (a_out->a_entry < virtual_offset ||
  100         a_out->a_entry >= virtual_offset + a_out->a_text ||
  101         a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
  102         return (-1);
  103 
  104     /* text + data can't exceed file size */
  105     if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
  106         return (EFAULT);
  107     /*
  108      * text/data/bss must not exceed limits
  109      */
  110     PROC_LOCK(imgp->proc);
  111     if (a_out->a_text > maxtsiz ||
  112         a_out->a_data + bss_size > lim_cur_proc(imgp->proc, RLIMIT_DATA) ||
  113         racct_set(imgp->proc, RACCT_DATA, a_out->a_data + bss_size) != 0) {
  114         PROC_UNLOCK(imgp->proc);
  115         return (ENOMEM);
  116     }
  117     PROC_UNLOCK(imgp->proc);
  118 
  119     VOP_UNLOCK(imgp->vp, 0);
  120 
  121     /*
  122      * Destroy old process VM and create a new one (with a new stack)
  123      */
  124     error = exec_new_vmspace(imgp, &svr4_sysvec);
  125     if (error)
  126             goto fail;
  127     vmspace = imgp->proc->p_vmspace;
  128 
  129     /*
  130      * Check if file_offset page aligned,.
  131      * Currently we cannot handle misalinged file offsets,
  132      * and so we read in the entire image (what a waste).
  133      */
  134     if (file_offset & PAGE_MASK) {
  135 #ifdef DEBUG
  136         printf("imgact: Non page aligned binary %lu\n", file_offset);
  137 #endif
  138         /*
  139          * Map text+data+bss read/write/execute
  140          */
  141         vmaddr = virtual_offset;
  142         error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
  143             a_out->a_text + a_out->a_data + bss_size, 0, VMFS_NO_SPACE,
  144             VM_PROT_ALL, VM_PROT_ALL, 0);
  145         if (error)
  146             goto fail;
  147 
  148         error = vn_rdwr(UIO_READ, imgp->vp, (void *)vmaddr, file_offset,
  149             a_out->a_text + a_out->a_data, UIO_USERSPACE, 0,
  150             curthread->td_ucred, NOCRED, &aresid, curthread);
  151         if (error != 0)
  152                 goto fail;
  153         if (aresid != 0) {
  154                 error = ENOEXEC;
  155                 goto fail;
  156         }
  157 
  158         /*
  159          * remove write enable on the 'text' part
  160          */
  161         error = vm_map_protect(&vmspace->vm_map,
  162                                vmaddr,
  163                                vmaddr + a_out->a_text,
  164                                VM_PROT_EXECUTE|VM_PROT_READ,
  165                                TRUE);
  166         if (error)
  167             goto fail;
  168     }
  169     else {
  170 #ifdef DEBUG
  171         printf("imgact: Page aligned binary %lu\n", file_offset);
  172 #endif
  173         /*
  174          * Map text+data read/execute
  175          */
  176         vmaddr = virtual_offset;
  177         error = vm_mmap(&vmspace->vm_map, &vmaddr,
  178                         a_out->a_text + a_out->a_data,
  179                         VM_PROT_READ | VM_PROT_EXECUTE,
  180                         VM_PROT_ALL,
  181                         MAP_PRIVATE | MAP_FIXED,
  182                         OBJT_VNODE, imgp->vp, file_offset);
  183         if (error)
  184             goto fail;
  185     
  186 #ifdef DEBUG
  187         printf("imgact: startaddr=%08lx, length=%08lx\n", (u_long)vmaddr,
  188             (u_long)a_out->a_text + a_out->a_data);
  189 #endif
  190         /*
  191          * allow read/write of data
  192          */
  193         error = vm_map_protect(&vmspace->vm_map,
  194                                vmaddr + a_out->a_text,
  195                                vmaddr + a_out->a_text + a_out->a_data,
  196                                VM_PROT_ALL,
  197                                FALSE);
  198         if (error)
  199             goto fail;
  200     
  201         /*
  202          * Allocate anon demand-zeroed area for uninitialized data
  203          */
  204         if (bss_size != 0) {
  205             vmaddr = virtual_offset + a_out->a_text + a_out->a_data;
  206             error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr, 
  207                 bss_size, 0, VMFS_NO_SPACE, VM_PROT_ALL, VM_PROT_ALL, 0);
  208             if (error)
  209                 goto fail;
  210 #ifdef DEBUG
  211             printf("imgact: bssaddr=%08lx, length=%08lx\n",
  212                 (u_long)vmaddr, bss_size);
  213 #endif
  214 
  215         }
  216     }
  217     /* Fill in process VM information */
  218     vmspace->vm_tsize = round_page(a_out->a_text) >> PAGE_SHIFT;
  219     vmspace->vm_dsize = round_page(a_out->a_data + bss_size) >> PAGE_SHIFT;
  220     vmspace->vm_taddr = (caddr_t)virtual_offset;
  221     vmspace->vm_daddr = (caddr_t)virtual_offset + a_out->a_text;
  222 
  223     /* Fill in image_params */
  224     imgp->interpreted = 0;
  225     imgp->entry_addr = a_out->a_entry;
  226     
  227     imgp->proc->p_sysent = &svr4_sysvec;
  228 fail:
  229     vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
  230     return (error);
  231 }
  232 
  233 /*
  234  * Tell kern_execve.c about it, with a little help from the linker.
  235  */
  236 struct execsw svr4_execsw = { exec_svr4_imgact, "svr4 ELF" };
  237 EXEC_SET(execsw_set, svr4_execsw);
  238 

Cache object: 0511021937560b8dc995380d02ad0a6c


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