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
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 ((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 */
150int
151kobj_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
195int
196kobj_load_vfs(kobj_t *kop, const char *path, const bool nochroot)
197{
198
199 return ENOSYS;
200}
201
202#endif
203