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 51int 52ELFNAME2(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