1 | /* $NetBSD: kern_module_vfs.c,v 1.14 2016/03/15 02:59:24 pgoyette 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 | * Kernel module file system interaction. |
34 | */ |
35 | |
36 | #include <sys/cdefs.h> |
37 | __KERNEL_RCSID(0, "$NetBSD: kern_module_vfs.c,v 1.14 2016/03/15 02:59:24 pgoyette Exp $" ); |
38 | |
39 | #define _MODULE_INTERNAL |
40 | #include <sys/param.h> |
41 | #include <sys/fcntl.h> |
42 | #include <sys/kmem.h> |
43 | #include <sys/kobj.h> |
44 | #include <sys/module.h> |
45 | #include <sys/namei.h> |
46 | #include <sys/pool.h> |
47 | #include <sys/stat.h> |
48 | #include <sys/vnode.h> |
49 | |
50 | #include <prop/proplib.h> |
51 | |
52 | static int module_load_plist_vfs(const char *, const bool, |
53 | prop_dictionary_t *); |
54 | |
55 | void |
56 | module_load_vfs_init(void) |
57 | { |
58 | module_load_vfs_vec = module_load_vfs; |
59 | aprint_normal("kern.module.path=%s\n" , module_base); |
60 | } |
61 | |
62 | int |
63 | module_load_vfs(const char *name, int flags, bool autoload, |
64 | module_t *mod, prop_dictionary_t *filedictp) |
65 | { |
66 | char *path; |
67 | bool nochroot; |
68 | int error; |
69 | prop_bool_t noload; |
70 | prop_dictionary_t moduledict; |
71 | |
72 | nochroot = false; |
73 | error = 0; |
74 | path = NULL; |
75 | moduledict = NULL; |
76 | if (filedictp) |
77 | *filedictp = NULL; |
78 | path = PNBUF_GET(); |
79 | |
80 | if (!autoload) { |
81 | if (strchr(name, '/') != NULL) { |
82 | nochroot = false; |
83 | snprintf(path, MAXPATHLEN, "%s" , name); |
84 | module_print("Loading module from %s" , path); |
85 | error = kobj_load_vfs(&mod->mod_kobj, path, nochroot); |
86 | } else |
87 | error = ENOENT; |
88 | } |
89 | if (autoload || (error == ENOENT)) { |
90 | if (strchr(name, '/') == NULL) { |
91 | nochroot = true; |
92 | snprintf(path, MAXPATHLEN, "%s/%s/%s.kmod" , |
93 | module_base, name, name); |
94 | module_print("Loading module from %s" , path); |
95 | error = kobj_load_vfs(&mod->mod_kobj, path, nochroot); |
96 | } else |
97 | error = ENOENT; |
98 | } |
99 | if (error != 0) { |
100 | PNBUF_PUT(path); |
101 | module_print("Cannot %sload kernel object `%s'" |
102 | " error=%d" , autoload ? "auto" : "" , name, error); |
103 | return error; |
104 | } |
105 | |
106 | /* |
107 | * Load and process <module>.plist if it exists. |
108 | */ |
109 | if (((flags & MODCTL_NO_PROP) == 0 && filedictp) || autoload) { |
110 | error = module_load_plist_vfs(path, nochroot, &moduledict); |
111 | if (error != 0) { |
112 | module_print("plist load returned error %d for `%s'" , |
113 | error, path); |
114 | if (error != ENOENT) |
115 | goto fail; |
116 | } else if (autoload) { |
117 | noload = prop_dictionary_get(moduledict, "noautoload" ); |
118 | if (noload != NULL && prop_bool_true(noload)) { |
119 | module_error("autoloading is disallowed for %s" , |
120 | path); |
121 | prop_object_release(moduledict); |
122 | error = EPERM; |
123 | goto fail; |
124 | } |
125 | } |
126 | if (error == 0) { /* can get here if error == ENOENT */ |
127 | if ((flags & MODCTL_NO_PROP) == 0 && filedictp) |
128 | *filedictp = moduledict; |
129 | else |
130 | prop_object_release(moduledict); |
131 | } |
132 | } |
133 | |
134 | PNBUF_PUT(path); |
135 | return 0; |
136 | |
137 | fail: |
138 | kobj_unload(mod->mod_kobj); |
139 | PNBUF_PUT(path); |
140 | return error; |
141 | } |
142 | |
143 | /* |
144 | * module_load_plist_vfs: |
145 | * |
146 | * Load a plist located in the file system into memory. |
147 | */ |
148 | static int |
149 | module_load_plist_vfs(const char *modpath, const bool nochroot, |
150 | prop_dictionary_t *filedictp) |
151 | { |
152 | struct pathbuf *pb; |
153 | struct nameidata nd; |
154 | struct stat sb; |
155 | void *base; |
156 | char *proppath; |
157 | const size_t plistsize = 8192; |
158 | size_t resid; |
159 | int error, pathlen; |
160 | |
161 | KASSERT(filedictp != NULL); |
162 | base = NULL; |
163 | |
164 | proppath = PNBUF_GET(); |
165 | strcpy(proppath, modpath); |
166 | pathlen = strlen(proppath); |
167 | if ((pathlen >= 6) && (strcmp(&proppath[pathlen - 5], ".kmod" ) == 0)) { |
168 | strcpy(&proppath[pathlen - 5], ".plist" ); |
169 | } else if (pathlen < MAXPATHLEN - 6) { |
170 | strcat(proppath, ".plist" ); |
171 | } else { |
172 | error = ENOENT; |
173 | goto out1; |
174 | } |
175 | |
176 | /* XXX this makes an unnecessary extra copy of the path */ |
177 | pb = pathbuf_create(proppath); |
178 | if (pb == NULL) { |
179 | error = ENOMEM; |
180 | goto out1; |
181 | } |
182 | module_print("Loading plist from %s" , proppath); |
183 | |
184 | NDINIT(&nd, LOOKUP, FOLLOW | (nochroot ? NOCHROOT : 0), pb); |
185 | |
186 | error = vn_open(&nd, FREAD, 0); |
187 | if (error != 0) { |
188 | goto out2; |
189 | } |
190 | |
191 | error = vn_stat(nd.ni_vp, &sb); |
192 | if (error != 0) { |
193 | goto out3; |
194 | } |
195 | if (sb.st_size >= (plistsize - 1)) { /* leave space for term \0 */ |
196 | error = EFBIG; |
197 | goto out3; |
198 | } |
199 | |
200 | base = kmem_alloc(plistsize, KM_SLEEP); |
201 | if (base == NULL) { |
202 | error = ENOMEM; |
203 | goto out3; |
204 | } |
205 | |
206 | error = vn_rdwr(UIO_READ, nd.ni_vp, base, sb.st_size, 0, |
207 | UIO_SYSSPACE, IO_NODELOCKED, curlwp->l_cred, &resid, curlwp); |
208 | *((uint8_t *)base + sb.st_size) = '\0'; |
209 | if (error == 0 && resid != 0) { |
210 | error = EFBIG; |
211 | } |
212 | if (error != 0) { |
213 | kmem_free(base, plistsize); |
214 | base = NULL; |
215 | goto out3; |
216 | } |
217 | |
218 | *filedictp = prop_dictionary_internalize(base); |
219 | if (*filedictp == NULL) { |
220 | error = EINVAL; |
221 | } |
222 | kmem_free(base, plistsize); |
223 | base = NULL; |
224 | KASSERT(error == 0); |
225 | |
226 | out3: |
227 | VOP_UNLOCK(nd.ni_vp); |
228 | vn_close(nd.ni_vp, FREAD, kauth_cred_get()); |
229 | |
230 | out2: |
231 | pathbuf_destroy(pb); |
232 | |
233 | out1: |
234 | PNBUF_PUT(proppath); |
235 | return error; |
236 | } |
237 | |