1 /* $NetBSD: compat_util.c,v 1.40 2007/12/31 15:32:09 ad 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: compat_util.c,v 1.40 2007/12/31 15:32:09 ad Exp $"); 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/namei.h> 45 #include <sys/proc.h> 46 #include <sys/file.h> 47 #include <sys/stat.h> 48 #include <sys/filedesc.h> 49 #include <sys/exec.h> 50 #include <sys/ioctl.h> 51 #include <sys/kernel.h> 52 #include <sys/malloc.h> 53 #include <sys/vnode.h> 54 #include <sys/syslog.h> 55 #include <sys/mount.h> 56 57 #include <compat/common/compat_util.h> 58 59 void 60 emul_find_root(struct lwp *l, struct exec_package *epp) 61 { 62 struct nameidata nd; 63 const char *emul_path; 64 65 if (epp->ep_emul_root != NULL) 66 /* We've already found it */ 67 return; 68 69 emul_path = epp->ep_esch->es_emul->e_path; 70 if (emul_path == NULL) 71 /* Emulation doesn't have a root */ 72 return; 73 74 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, emul_path); 75 if (namei(&nd) != 0) 76 /* emulation root doesn't exist */ 77 return; 78 79 epp->ep_emul_root = nd.ni_vp; 80 } 81 82 /* 83 * Search the alternate path for dynamic binary interpreter. If not found 84 * there, check if the interpreter exists in within 'proper' tree. 85 */ 86 int 87 emul_find_interp(struct lwp *l, struct exec_package *epp, const char *itp) 88 { 89 int error; 90 struct nameidata nd; 91 unsigned int flags; 92 93 /* If we haven't found the emulation root already, do so now */ 94 /* Maybe we should remember failures somehow ? */ 95 if (epp->ep_esch->es_emul->e_path != 0 && epp->ep_emul_root == NULL) 96 emul_find_root(l, epp); 97 98 if (epp->ep_interp != NULL) 99 vrele(epp->ep_interp); 100 101 /* We need to use the emulation root for the new program, 102 * not the one for the current process. */ 103 if (epp->ep_emul_root == NULL) 104 flags = FOLLOW; 105 else { 106 nd.ni_erootdir = epp->ep_emul_root; 107 /* hack: Pass in the emulation path for ktrace calls */ 108 nd.ni_next = epp->ep_esch->es_emul->e_path; 109 flags = FOLLOW | TRYEMULROOT | EMULROOTSET; 110 } 111 112 NDINIT(&nd, LOOKUP, flags, UIO_SYSSPACE, itp); 113 error = namei(&nd); 114 if (error != 0) { 115 epp->ep_interp = NULL; 116 return error; 117 } 118 119 /* Save interpreter in case we actually need to load it */ 120 epp->ep_interp = nd.ni_vp; 121 122 return 0; 123 } 124 125 /* 126 * Translate one set of flags to another, based on the entries in 127 * the given table. If 'leftover' is specified, it is filled in 128 * with any flags which could not be translated. 129 */ 130 unsigned long 131 emul_flags_translate(const struct emul_flags_xtab *tab, 132 unsigned long in, unsigned long *leftover) 133 { 134 unsigned long out; 135 136 for (out = 0; tab->omask != 0; tab++) { 137 if ((in & tab->omask) == tab->oval) { 138 in &= ~tab->omask; 139 out |= tab->nval; 140 } 141 } 142 if (leftover != NULL) 143 *leftover = in; 144 return (out); 145 } 146 147 void 148 compat_offseterr(struct vnode *vp, const char *msg) 149 { 150 struct mount *mp; 151 152 mp = vp->v_mount; 153 154 log(LOG_ERR, "%s: dir offset too large on fs %s (mounted from %s)\n", 155 msg, mp->mnt_stat.f_mntonname, mp->mnt_stat.f_mntfromname); 156 uprintf("%s: dir offset too large for emulated program\n", msg); 157 } 158