1 /* $NetBSD: compat_util.c,v 1.41 2008/04/28 20:23:41 martin Exp $ */ 2 3 /*- 4 * Copyright (c) 1994 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Christos Zoulas and Frank van der Linden. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: compat_util.c,v 1.41 2008/04/28 20:23:41 martin Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/namei.h> 38 #include <sys/proc.h> 39 #include <sys/file.h> 40 #include <sys/stat.h> 41 #include <sys/filedesc.h> 42 #include <sys/exec.h> 43 #include <sys/ioctl.h> 44 #include <sys/kernel.h> 45 #include <sys/malloc.h> 46 #include <sys/vnode.h> 47 #include <sys/syslog.h> 48 #include <sys/mount.h> 49 50 #include <compat/common/compat_util.h> 51 52 void 53 emul_find_root(struct lwp *l, struct exec_package *epp) 54 { 55 struct nameidata nd; 56 const char *emul_path; 57 58 if (epp->ep_emul_root != NULL) 59 /* We've already found it */ 60 return; 61 62 emul_path = epp->ep_esch->es_emul->e_path; 63 if (emul_path == NULL) 64 /* Emulation doesn't have a root */ 65 return; 66 67 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, emul_path); 68 if (namei(&nd) != 0) 69 /* emulation root doesn't exist */ 70 return; 71 72 epp->ep_emul_root = nd.ni_vp; 73 } 74 75 /* 76 * Search the alternate path for dynamic binary interpreter. If not found 77 * there, check if the interpreter exists in within 'proper' tree. 78 */ 79 int 80 emul_find_interp(struct lwp *l, struct exec_package *epp, const char *itp) 81 { 82 int error; 83 struct nameidata nd; 84 unsigned int flags; 85 86 /* If we haven't found the emulation root already, do so now */ 87 /* Maybe we should remember failures somehow ? */ 88 if (epp->ep_esch->es_emul->e_path != 0 && epp->ep_emul_root == NULL) 89 emul_find_root(l, epp); 90 91 if (epp->ep_interp != NULL) 92 vrele(epp->ep_interp); 93 94 /* We need to use the emulation root for the new program, 95 * not the one for the current process. */ 96 if (epp->ep_emul_root == NULL) 97 flags = FOLLOW; 98 else { 99 nd.ni_erootdir = epp->ep_emul_root; 100 /* hack: Pass in the emulation path for ktrace calls */ 101 nd.ni_next = epp->ep_esch->es_emul->e_path; 102 flags = FOLLOW | TRYEMULROOT | EMULROOTSET; 103 } 104 105 NDINIT(&nd, LOOKUP, flags, UIO_SYSSPACE, itp); 106 error = namei(&nd); 107 if (error != 0) { 108 epp->ep_interp = NULL; 109 return error; 110 } 111 112 /* Save interpreter in case we actually need to load it */ 113 epp->ep_interp = nd.ni_vp; 114 115 return 0; 116 } 117 118 /* 119 * Translate one set of flags to another, based on the entries in 120 * the given table. If 'leftover' is specified, it is filled in 121 * with any flags which could not be translated. 122 */ 123 unsigned long 124 emul_flags_translate(const struct emul_flags_xtab *tab, 125 unsigned long in, unsigned long *leftover) 126 { 127 unsigned long out; 128 129 for (out = 0; tab->omask != 0; tab++) { 130 if ((in & tab->omask) == tab->oval) { 131 in &= ~tab->omask; 132 out |= tab->nval; 133 } 134 } 135 if (leftover != NULL) 136 *leftover = in; 137 return (out); 138 } 139 140 void 141 compat_offseterr(struct vnode *vp, const char *msg) 142 { 143 struct mount *mp; 144 145 mp = vp->v_mount; 146 147 log(LOG_ERR, "%s: dir offset too large on fs %s (mounted from %s)\n", 148 msg, mp->mnt_stat.f_mntonname, mp->mnt_stat.f_mntfromname); 149 uprintf("%s: dir offset too large for emulated program\n", msg); 150 } 151