subr_kobj_vfs.c revision 1.9
1/* $NetBSD: subr_kobj_vfs.c,v 1.9 2016/07/09 07:25:00 maxv Exp $ */ 2 3/*- 4 * Copyright (c) 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software developed for The NetBSD Foundation 8 * by Andrew Doran. 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/*- 33 * Copyright (c) 1998-2000 Doug Rabson 34 * Copyright (c) 2004 Peter Wemm 35 * All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 46 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 47 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 48 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 49 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 50 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 51 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 52 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 53 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 54 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 55 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 56 * SUCH DAMAGE. 57 */ 58 59/* 60 * Kernel loader vfs routines. 61 */ 62 63#include <sys/kobj_impl.h> 64 65#ifdef _KERNEL_OPT 66#include "opt_modular.h" 67#endif 68 69#ifdef MODULAR 70 71#include <sys/param.h> 72#include <sys/fcntl.h> 73#include <sys/module.h> 74#include <sys/namei.h> 75#include <sys/vnode.h> 76 77#include <sys/cdefs.h> 78__KERNEL_RCSID(0, "$NetBSD: subr_kobj_vfs.c,v 1.9 2016/07/09 07:25:00 maxv Exp $"); 79 80static void 81kobj_close_vfs(kobj_t ko) 82{ 83 84 VOP_UNLOCK(ko->ko_source); 85 vn_close(ko->ko_source, FREAD, kauth_cred_get()); 86} 87 88/* 89 * kobj_read: 90 * 91 * Utility function: read from the object. 92 */ 93static int 94kobj_read_vfs(kobj_t ko, void **basep, size_t size, off_t off, 95 bool allocate) 96{ 97 size_t resid; 98 void *base; 99 int error; 100 101 KASSERT(ko->ko_source != NULL); 102 103 if (allocate) { 104 base = kmem_alloc(size, KM_SLEEP); 105 } else { 106 base = *basep; 107#ifdef DIAGNOSTIC 108 bool ok = false; 109 if ((uintptr_t)base >= (uintptr_t)ko->ko_text_address && 110 (uintptr_t)base + size <= 111 (uintptr_t)ko->ko_text_address + ko->ko_text_size) 112 ok = true; 113 if ((uintptr_t)base >= (uintptr_t)ko->ko_data_address && 114 (uintptr_t)base + size <= 115 (uintptr_t)ko->ko_data_address + ko->ko_data_size) 116 ok = true; 117 if (!ok) 118 panic("kobj_read_vfs: not in a dedicated segment"); 119#endif 120 } 121 122 error = vn_rdwr(UIO_READ, ko->ko_source, base, size, off, 123 UIO_SYSSPACE, IO_NODELOCKED, curlwp->l_cred, &resid, 124 curlwp); 125 126 if (error == 0 && resid != 0) { 127 error = EINVAL; 128 } 129 130 if (allocate && error != 0) { 131 kmem_free(base, size); 132 base = NULL; 133 } 134 135 if (allocate) 136 *basep = base; 137 138 return error; 139} 140 141/* 142 * kobj_load_vfs: 143 * 144 * Load an object located in the file system. 145 */ 146int 147kobj_load_vfs(kobj_t *kop, const char *path, const bool nochroot) 148{ 149 struct nameidata nd; 150 struct pathbuf *pb; 151 int error; 152 kobj_t ko; 153 154 KASSERT(path != NULL); 155 if (strchr(path, '/') == NULL) 156 return ENOENT; 157 158 ko = kmem_zalloc(sizeof(*ko), KM_SLEEP); 159 if (ko == NULL) { 160 return ENOMEM; 161 } 162 163 pb = pathbuf_create(path); 164 if (pb == NULL) { 165 kmem_free(ko, sizeof(*ko)); 166 return ENOMEM; 167 } 168 169 NDINIT(&nd, LOOKUP, FOLLOW | (nochroot ? NOCHROOT : 0), pb); 170 error = vn_open(&nd, FREAD, 0); 171 172 if (error != 0) { 173 pathbuf_destroy(pb); 174 kmem_free(ko, sizeof(*ko)); 175 return error; 176 } 177 178 ko->ko_type = KT_VNODE; 179 kobj_setname(ko, path); 180 ko->ko_source = nd.ni_vp; 181 ko->ko_read = kobj_read_vfs; 182 ko->ko_close = kobj_close_vfs; 183 pathbuf_destroy(pb); 184 185 *kop = ko; 186 return kobj_load(ko); 187} 188 189#else /* MODULAR */ 190 191int 192kobj_load_vfs(kobj_t *kop, const char *path, const bool nochroot) 193{ 194 195 return ENOSYS; 196} 197 198#endif 199