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      1 /*	$NetBSD: freebsd_exec_elf32.c,v 1.21 2017/08/08 08:04:06 maxv Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1993, 1994 Christopher G. Demetriou
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *      This product includes software developed by Christopher G. Demetriou.
     18  * 4. 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 __KERNEL_RCSID(0, "$NetBSD: freebsd_exec_elf32.c,v 1.21 2017/08/08 08:04:06 maxv Exp $");
     35 
     36 #include <sys/param.h>
     37 #include <sys/systm.h>
     38 #include <sys/proc.h>
     39 #include <sys/vnode.h>
     40 #include <sys/exec.h>
     41 #ifndef ELFSIZE
     42 #  define ELFSIZE 32
     43 #endif /* !ELFSIZE */
     44 #include <sys/exec_elf.h>
     45 
     46 #include <compat/freebsd/freebsd_exec.h>
     47 #include <compat/common/compat_util.h>
     48 
     49 #include <compat/freebsd/freebsd_machdep.h>
     50 
     51 int
     52 ELFNAME2(freebsd,probe)(struct lwp *l, struct exec_package *epp, void *veh,
     53     char *itp, vaddr_t *pos)
     54 {
     55 	int error;
     56 	Elf_Ehdr *eh = (Elf_Ehdr *) veh;
     57 	static const char wantBrand[] = FREEBSD_ELF_BRAND_STRING;
     58 	static const char wantInterp[] = FREEBSD_ELF_INTERP_PREFIX_STRING;
     59 
     60 	/*
     61 	 * Insist that the executable have a brand, and that it be "FreeBSD".
     62 	 * Newer FreeBSD binaries have OSABI set to ELFOSABI_FREEBSD. This
     63 	 * is arguably broken, but they seem to think they need it, for
     64 	 * whatever reason.
     65 	 */
     66 #ifndef EI_BRAND
     67 #define EI_BRAND 8
     68 #endif
     69 	if ((eh->e_ident[EI_BRAND] == '\0' ||
     70 	     strcmp(&eh->e_ident[EI_BRAND], wantBrand) != 0) &&
     71 		eh->e_ident[EI_OSABI] != ELFOSABI_FREEBSD)
     72 		return ENOEXEC;
     73 
     74 	if (itp) {
     75 		if (strncmp(itp, wantInterp, sizeof(wantInterp) - 1))
     76 			return ENOEXEC;
     77 		if ((error = emul_find_interp(l, epp, itp)))
     78 			return error;
     79 	}
     80 
     81 	return 0;
     82 }
     83