| 1 | /* $NetBSD: subr_kobj_vfs.c,v 1.10 2016/07/20 13:36:19 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 1.10 2016/07/20 13:36:19 maxv Exp $" ); |
| 79 | |
| 80 | static void |
| 81 | kobj_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 | */ |
| 93 | static int |
| 94 | kobj_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 ((uintptr_t)base >= (uintptr_t)ko->ko_rodata_address && |
| 118 | (uintptr_t)base + size <= |
| 119 | (uintptr_t)ko->ko_rodata_address + ko->ko_rodata_size) |
| 120 | ok = true; |
| 121 | if (!ok) |
| 122 | panic("kobj_read_vfs: not in a dedicated segment" ); |
| 123 | #endif |
| 124 | } |
| 125 | |
| 126 | error = vn_rdwr(UIO_READ, ko->ko_source, base, size, off, |
| 127 | UIO_SYSSPACE, IO_NODELOCKED, curlwp->l_cred, &resid, |
| 128 | curlwp); |
| 129 | |
| 130 | if (error == 0 && resid != 0) { |
| 131 | error = EINVAL; |
| 132 | } |
| 133 | |
| 134 | if (allocate && error != 0) { |
| 135 | kmem_free(base, size); |
| 136 | base = NULL; |
| 137 | } |
| 138 | |
| 139 | if (allocate) |
| 140 | *basep = base; |
| 141 | |
| 142 | return error; |
| 143 | } |
| 144 | |
| 145 | /* |
| 146 | * kobj_load_vfs: |
| 147 | * |
| 148 | * Load an object located in the file system. |
| 149 | */ |
| 150 | int |
| 151 | kobj_load_vfs(kobj_t *kop, const char *path, const bool nochroot) |
| 152 | { |
| 153 | struct nameidata nd; |
| 154 | struct pathbuf *pb; |
| 155 | int error; |
| 156 | kobj_t ko; |
| 157 | |
| 158 | KASSERT(path != NULL); |
| 159 | if (strchr(path, '/') == NULL) |
| 160 | return ENOENT; |
| 161 | |
| 162 | ko = kmem_zalloc(sizeof(*ko), KM_SLEEP); |
| 163 | if (ko == NULL) { |
| 164 | return ENOMEM; |
| 165 | } |
| 166 | |
| 167 | pb = pathbuf_create(path); |
| 168 | if (pb == NULL) { |
| 169 | kmem_free(ko, sizeof(*ko)); |
| 170 | return ENOMEM; |
| 171 | } |
| 172 | |
| 173 | NDINIT(&nd, LOOKUP, FOLLOW | (nochroot ? NOCHROOT : 0), pb); |
| 174 | error = vn_open(&nd, FREAD, 0); |
| 175 | |
| 176 | if (error != 0) { |
| 177 | pathbuf_destroy(pb); |
| 178 | kmem_free(ko, sizeof(*ko)); |
| 179 | return error; |
| 180 | } |
| 181 | |
| 182 | ko->ko_type = KT_VNODE; |
| 183 | kobj_setname(ko, path); |
| 184 | ko->ko_source = nd.ni_vp; |
| 185 | ko->ko_read = kobj_read_vfs; |
| 186 | ko->ko_close = kobj_close_vfs; |
| 187 | pathbuf_destroy(pb); |
| 188 | |
| 189 | *kop = ko; |
| 190 | return kobj_load(ko); |
| 191 | } |
| 192 | |
| 193 | #else /* MODULAR */ |
| 194 | |
| 195 | int |
| 196 | kobj_load_vfs(kobj_t *kop, const char *path, const bool nochroot) |
| 197 | { |
| 198 | |
| 199 | return ENOSYS; |
| 200 | } |
| 201 | |
| 202 | #endif |
| 203 | |