FreeBSD/Linux Kernel Cross Reference
sys/compat/ibcs2/ibcs2_exec_elf32.c

     /*      $NetBSD: ibcs2_exec_elf32.c,v 1.17 2007/12/08 18:36:00 dsl Exp $        */
     
     /*
      * Copyright (c) 1994, 1995, 1998 Scott Bartram
      * Copyright (c) 1994 Adam Glass
      * Copyright (c) 1993, 1994 Christopher G. Demetriou
      * All rights reserved.
      *
      * originally from kern/exec_ecoff.c
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by Scott Bartram.
     * 4. The name of the author may not be used to endorse or promote products
     *    derived from this software without specific prior written permission
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: ibcs2_exec_elf32.c,v 1.17 2007/12/08 18:36:00 dsl Exp $");
    
    #define ELFSIZE         32
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/proc.h>
    #include <sys/malloc.h>
    #include <sys/namei.h>
    #include <sys/vnode.h>
    #include <sys/mount.h>
    #include <sys/exec.h>
    #include <sys/exec_elf.h>
    
    #include <sys/mman.h>
    
    #include <sys/cpu.h>
    #include <machine/reg.h>
    #include <machine/ibcs2_machdep.h>
    
    #include <compat/ibcs2/ibcs2_types.h>
    #include <compat/ibcs2/ibcs2_exec.h>
    #include <compat/ibcs2/ibcs2_errno.h>
    #include <compat/ibcs2/ibcs2_util.h>
    
    static int ibcs2_elf32_signature(struct lwp *l, struct exec_package *,
                                          Elf32_Ehdr *);
    
    /*
     * The SCO compiler adds the string "SCO" to the .notes section of all
     * binaries I've seen so far.
     *
     * XXX - probably should only compare the id in the actual ELF notes struct
     */
    
    #define SCO_SIGNATURE   "\004\0\0\0\014\0\0\0\001\0\0\0SCO\0"
    
    static int
    ibcs2_elf32_signature(struct lwp *l, struct exec_package *epp, Elf32_Ehdr *eh)
    {
            size_t shsize = sizeof(Elf32_Shdr) * eh->e_shnum;
            size_t i;
            static const char signature[] = SCO_SIGNATURE;
            char tbuf[sizeof(signature) - 1];
            Elf32_Shdr *sh;
            int error;
    
            if (shsize > 64 * 1024)
                    return ENOEXEC;
    
            sh = (Elf32_Shdr *)malloc(shsize, M_TEMP, M_WAITOK);
    
            if ((error = exec_read_from(l, epp->ep_vp, eh->e_shoff, sh,
                shsize)) != 0)
                    goto out;
    
            for (i = 0; i < eh->e_shnum; i++) {
                    Elf32_Shdr *s = &sh[i];
                    if (s->sh_type != SHT_NOTE ||
                        s->sh_flags != 0 ||
                        s->sh_size < sizeof(signature) - 1)
                           continue;
   
                   if ((error = exec_read_from(l, epp->ep_vp, s->sh_offset, tbuf,
                       sizeof(signature) - 1)) != 0)
                           goto out;
   
                   if (memcmp(tbuf, signature, sizeof(signature) - 1) == 0)
                           goto out;
                   else
                           break;  /* only one .note section so quit */
           }
           error = EFTYPE;
   
   out:
           free(sh, M_TEMP);
           return error;
   }
   
   /*
    * ibcs2_elf32_probe - search the executable for signs of SCO
    */
   
   int
   ibcs2_elf32_probe(struct lwp *l, struct exec_package *epp, void *eh, char *itp,
       vaddr_t *pos)
   {
           int error;
   
           if ((error = ibcs2_elf32_signature(l, epp, eh)) != 0)
                   return error;
   
           if (itp) {
                   if ((error = emul_find_interp(l, epp, itp)))
                           return error;
           }
           return 0;
   }

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