1 /* $NetBSD: subr_kobj_vfs.c,v 1.12 2021/06/29 22:40:53 dholland 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 1.12 2021/06/29 22:40:53 dholland Exp $");
79
80 static void
kobj_close_vfs(kobj_t ko)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
kobj_read_vfs(kobj_t ko,void ** basep,size_t size,off_t off,bool allocate)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
kobj_load_vfs(kobj_t * kop,const char * path,const bool nochroot)151 kobj_load_vfs(kobj_t *kop, const char *path, const bool nochroot)
152 {
153 struct pathbuf *pb;
154 struct vnode *vp;
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 pb = pathbuf_create(path);
164 if (pb == NULL) {
165 kmem_free(ko, sizeof(*ko));
166 return ENOMEM;
167 }
168
169 error = vn_open(NULL, pb, (nochroot ? NOCHROOT : 0), FREAD, 0,
170 &vp, NULL, NULL);
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 = 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
191 int
kobj_load_vfs(kobj_t * kop,const char * path,const bool nochroot)192 kobj_load_vfs(kobj_t *kop, const char *path, const bool nochroot)
193 {
194
195 return ENOSYS;
196 }
197
198 #endif
199