1 /* $OpenBSD: exec_conf.c,v 1.31 2013/10/17 10:38:28 deraadt Exp $ */ 2 /* $NetBSD: exec_conf.c,v 1.16 1995/12/09 05:34:47 cgd Exp $ */ 3 4 /* 5 * Copyright (c) 1993, 1994 Christopher G. Demetriou 6 * All rights reserved. 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 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Christopher G. Demetriou. 19 * 4. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/param.h> 35 #include <sys/exec.h> 36 #include <sys/exec_script.h> 37 38 #if defined(_KERN_DO_ELF) || defined(_KERN_DO_ELF64) 39 #include <sys/exec_elf.h> 40 #endif 41 42 #ifdef COMPAT_LINUX 43 #include <compat/linux/linux_exec.h> 44 #endif 45 46 extern struct emul emul_native, emul_elf32, emul_elf64, emul_linux_elf; 47 48 struct execsw execsw[] = { 49 { EXEC_SCRIPT_HDRSZ, exec_script_makecmds, &emul_native, }, /* shell scripts */ 50 #ifdef _KERN_DO_ELF 51 { sizeof(Elf32_Ehdr), exec_elf32_makecmds, &emul_native }, /* elf binaries */ 52 #endif 53 #ifdef _KERN_DO_ELF64 54 { sizeof(Elf64_Ehdr), exec_elf64_makecmds, &emul_native }, /* elf binaries */ 55 #endif /* ELF64 */ 56 #ifdef COMPAT_LINUX 57 { sizeof(Elf32_Ehdr), exec_linux_elf32_makecmds, &emul_linux_elf }, 58 #endif 59 #ifdef LKM 60 { 0, NULL, NULL }, /* entries for LKMs */ 61 { 0, NULL, NULL }, 62 { 0, NULL, NULL }, 63 { 0, NULL, NULL }, 64 { 0, NULL, NULL }, 65 #endif 66 }; 67 int nexecs = (sizeof execsw / sizeof(*execsw)); 68 int exec_maxhdrsz; 69 70 void init_exec(void); 71 72 void 73 init_exec(void) 74 { 75 int i; 76 77 /* 78 * figure out the maximum size of an exec header. 79 * XXX should be able to keep LKM code from modifying exec switch 80 * when we're still using it, but... 81 */ 82 for (i = 0; i < nexecs; i++) 83 if (execsw[i].es_check != NULL && 84 execsw[i].es_hdrsz > exec_maxhdrsz) 85 exec_maxhdrsz = execsw[i].es_hdrsz; 86 } 87