1 /* $NetBSD: compat_util.c,v 1.42 2009/06/29 05:08:15 dholland 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 1.42 2009/06/29 05:08:15 dholland 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 vnode *vp; 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 if (namei_simple_kernel(emul_path, NSM_FOLLOW_NOEMULROOT, &vp) != 0) 68 /* emulation root doesn't exist */ 69 return; 70 71 epp->ep_emul_root = vp; 72 } 73 74 /* 75 * Search the alternate path for dynamic binary interpreter. If not found 76 * there, check if the interpreter exists in within 'proper' tree. 77 */ 78 int 79 emul_find_interp(struct lwp *l, struct exec_package *epp, const char *itp) 80 { 81 int error; 82 struct nameidata nd; 83 unsigned int flags; 84 85 /* If we haven't found the emulation root already, do so now */ 86 /* Maybe we should remember failures somehow ? */ 87 if (epp->ep_esch->es_emul->e_path != 0 && epp->ep_emul_root == NULL) 88 emul_find_root(l, epp); 89 90 if (epp->ep_interp != NULL) 91 vrele(epp->ep_interp); 92 93 /* We need to use the emulation root for the new program, 94 * not the one for the current process. */ 95 if (epp->ep_emul_root == NULL) 96 flags = FOLLOW; 97 else { 98 nd.ni_erootdir = epp->ep_emul_root; 99 /* hack: Pass in the emulation path for ktrace calls */ 100 nd.ni_next = epp->ep_esch->es_emul->e_path; 101 flags = FOLLOW | TRYEMULROOT | EMULROOTSET; 102 } 103 104 NDINIT(&nd, LOOKUP, flags, UIO_SYSSPACE, itp); 105 error = namei(&nd); 106 if (error != 0) { 107 epp->ep_interp = NULL; 108 return error; 109 } 110 111 /* Save interpreter in case we actually need to load it */ 112 epp->ep_interp = nd.ni_vp; 113 114 return 0; 115 } 116 117 /* 118 * Translate one set of flags to another, based on the entries in 119 * the given table. If 'leftover' is specified, it is filled in 120 * with any flags which could not be translated. 121 */ 122 unsigned long 123 emul_flags_translate(const struct emul_flags_xtab *tab, 124 unsigned long in, unsigned long *leftover) 125 { 126 unsigned long out; 127 128 for (out = 0; tab->omask != 0; tab++) { 129 if ((in & tab->omask) == tab->oval) { 130 in &= ~tab->omask; 131 out |= tab->nval; 132 } 133 } 134 if (leftover != NULL) 135 *leftover = in; 136 return (out); 137 } 138 139 void 140 compat_offseterr(struct vnode *vp, const char *msg) 141 { 142 struct mount *mp; 143 144 mp = vp->v_mount; 145 146 log(LOG_ERR, "%s: dir offset too large on fs %s (mounted from %s)\n", 147 msg, mp->mnt_stat.f_mntonname, mp->mnt_stat.f_mntfromname); 148 uprintf("%s: dir offset too large for emulated program\n", msg); 149 } 150