1 /* $NetBSD: kern_mod_80.c,v 1.6 2019/12/12 02:15:42 pgoyette Exp $ */
2
3 /*-
4 * Copyright (c) 2008 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 /*
30 * System calls relating to loadable modules.
31 */
32
33 #include <sys/cdefs.h>
34 __KERNEL_RCSID(0, "$NetBSD: kern_mod_80.c,v 1.6 2019/12/12 02:15:42 pgoyette Exp $");
35
36 #ifdef _KERNEL_OPT
37 #include "opt_compat_netbsd.h"
38 #include "opt_modular.h"
39 #endif
40
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/proc.h>
44 #include <sys/namei.h>
45 #include <sys/kauth.h>
46 #include <sys/kmem.h>
47 #include <sys/kobj.h>
48 #include <sys/module.h>
49 #include <sys/syscall.h>
50 #include <sys/syscallargs.h>
51 #include <sys/compat_stub.h>
52
53 #include <compat/sys/module.h>
54
55 #include <compat/common/compat_mod.h>
56
57 static int
compat_80_modstat(int cmd,struct iovec * iov,void * arg)58 compat_80_modstat(int cmd, struct iovec *iov, void *arg)
59 {
60 omodstat_t *oms, *omso;
61 modinfo_t *mi;
62 module_t *mod;
63 vaddr_t addr;
64 size_t size;
65 size_t omslen;
66 size_t used;
67 int error;
68 int omscnt;
69 bool stataddr;
70 const char *suffix = "...";
71
72 if (cmd != MODCTL_OSTAT)
73 return EINVAL;
74
75 error = copyin(arg, iov, sizeof(*iov));
76 if (error != 0) {
77 return error;
78 }
79
80 /* If not privileged, don't expose kernel addresses. */
81 error = kauth_authorize_system(kauth_cred_get(), KAUTH_SYSTEM_MODULE,
82 0, (void *)(uintptr_t)MODCTL_STAT, NULL, NULL);
83 stataddr = (error == 0);
84
85 kernconfig_lock();
86 omscnt = 0;
87 TAILQ_FOREACH(mod, &module_list, mod_chain) {
88 omscnt++;
89 mi = mod->mod_info;
90 }
91 TAILQ_FOREACH(mod, &module_builtins, mod_chain) {
92 omscnt++;
93 mi = mod->mod_info;
94 }
95 omslen = omscnt * sizeof(omodstat_t);
96 omso = kmem_zalloc(omslen, KM_SLEEP);
97 oms = omso;
98 TAILQ_FOREACH(mod, &module_list, mod_chain) {
99 mi = mod->mod_info;
100 strlcpy(oms->oms_name, mi->mi_name, sizeof(oms->oms_name));
101 if (mi->mi_required != NULL) {
102 used = strlcpy(oms->oms_required, mi->mi_required,
103 sizeof(oms->oms_required));
104 if (used >= sizeof(oms->oms_required)) {
105 oms->oms_required[sizeof(oms->oms_required) -
106 strlen(suffix) - 1] = '\0';
107 strlcat(oms->oms_required, suffix,
108 sizeof(oms->oms_required));
109 }
110 }
111 if (mod->mod_kobj != NULL && stataddr) {
112 kobj_stat(mod->mod_kobj, &addr, &size);
113 oms->oms_addr = addr;
114 oms->oms_size = size;
115 }
116 oms->oms_class = mi->mi_class;
117 oms->oms_refcnt = mod->mod_refcnt;
118 oms->oms_source = mod->mod_source;
119 oms->oms_flags = mod->mod_flags;
120 oms++;
121 }
122 TAILQ_FOREACH(mod, &module_builtins, mod_chain) {
123 mi = mod->mod_info;
124 strlcpy(oms->oms_name, mi->mi_name, sizeof(oms->oms_name));
125 if (mi->mi_required != NULL) {
126 used = strlcpy(oms->oms_required, mi->mi_required,
127 sizeof(oms->oms_required));
128 if (used >= sizeof(oms->oms_required)) {
129 oms->oms_required[sizeof(oms->oms_required) -
130 strlen(suffix) - 1] = '\0';
131 strlcat(oms->oms_required, suffix,
132 sizeof(oms->oms_required));
133 }
134 }
135 if (mod->mod_kobj != NULL && stataddr) {
136 kobj_stat(mod->mod_kobj, &addr, &size);
137 oms->oms_addr = addr;
138 oms->oms_size = size;
139 }
140 oms->oms_class = mi->mi_class;
141 oms->oms_refcnt = -1;
142 KASSERT(mod->mod_source == MODULE_SOURCE_KERNEL);
143 oms->oms_source = mod->mod_source;
144 oms++;
145 }
146 kernconfig_unlock();
147 error = copyout(omso, iov->iov_base, uimin(omslen, iov->iov_len));
148 kmem_free(omso, omslen);
149 if (error == 0) {
150 iov->iov_len = omslen;
151 error = copyout(iov, arg, sizeof(*iov));
152 }
153
154 return error;
155 }
156
157 void
kern_mod_80_init(void)158 kern_mod_80_init(void)
159 {
160
161 MODULE_HOOK_SET(compat_modstat_80_hook, compat_80_modstat);
162 }
163
164 void
kern_mod_80_fini(void)165 kern_mod_80_fini(void)
166 {
167
168 MODULE_HOOK_UNSET(compat_modstat_80_hook);
169 }
170