Eric Lee / smarc-fsl-linux-kernel

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Commit 417daa1e8f893fbac88fd395340ba7779fd3926c

Authored by Eric W. Biederman
Committed by Greg Kroah-Hartman
1 parent 5f71a29629
Exists in master and in 39 other branches 8mp-imx_5.4.70_2.3.0, 8qm-imx_5.4.70_2.3.0, emb_imx_lf-5.15.y, emb_lf-6.1.y, imx_3.0.35_4.1.0, imx_3.10.17_1.0.1_ga, imx_3.10.53_1.1.0_ga, imx_3.14.28_1.0.0_ga, imx_4.1.15_1.0.0_ga, pitx_8mp_lf-5.10.y, rt-smarc-imx_4.1.15_1.0.0_ga, rt_linux_5.15.71, smarc-8m-android-11.0.0_2.0.0, smarc-imx6_4.14.98_2.0.0_ga, smarc-imx6_4.9.88_2.0.0_ga, smarc-imx7_4.14.98_2.0.0_ga, smarc-imx7_4.9.11_1.0.0_ga, smarc-imx7_4.9.88_2.0.0_ga, smarc-imx_3.10.53_1.1.0_ga, smarc-imx_3.14.28_1.0.0_ga, smarc-imx_4.1.15_1.0.0_ga, smarc-imx_4.9.11_1.0.0_ga, smarc-imx_4.9.51_imx8m_ga, smarc-imx_4.9.88_2.0.0_ga, smarc-m6.0.1_2.1.0-ga, smarc-n7.1.2_2.0.0-ga, smarc-rel_imx_4.1.15_1.2.0_ga, smarc_8m_00d0_imx_4.14.98_2.0.0_ga, smarc_8m_imx_4.14.78_1.0.0_ga, smarc_8m_imx_4.14.98_2.0.0_ga, smarc_8m_imx_4.19.35_1.1.0, smarc_8mm_imx_4.14.78_1.0.0_ga, smarc_8mm_imx_4.14.98_2.0.0_ga, smarc_8mm_imx_4.19.35_1.1.0, smarc_8mm_imx_5.4.24_2.1.0, smarc_8mp_lf-5.10.y, smarc_8mq_imx_5.4.24_2.1.0, smarc_8mq_lf-5.10.y, smarc_imx_lf-5.15.y

hotplug: netns aware uevent_helper 

It only makes sense for uevent_helper to get events
in the intial namespaces.  It's invocation is not
per namespace and it is not clear how we could make
it's invocation namespace aware.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

Showing 1 changed file with 17 additions and 2 deletions Inline Diff

lib/kobject_uevent.c
Diff comments   View file @ 417daa1
1 /* 1 /*
2 * kernel userspace event delivery 2 * kernel userspace event delivery
3 * 3 *
4 * Copyright (C) 2004 Red Hat, Inc. All rights reserved. 4 * Copyright (C) 2004 Red Hat, Inc. All rights reserved.
5 * Copyright (C) 2004 Novell, Inc. All rights reserved. 5 * Copyright (C) 2004 Novell, Inc. All rights reserved.
6 * Copyright (C) 2004 IBM, Inc. All rights reserved. 6 * Copyright (C) 2004 IBM, Inc. All rights reserved.
7 * 7 *
8 * Licensed under the GNU GPL v2. 8 * Licensed under the GNU GPL v2.
9 * 9 *
10 * Authors: 10 * Authors:
11 * Robert Love <rml@novell.com> 11 * Robert Love <rml@novell.com>
12 * Kay Sievers <kay.sievers@vrfy.org> 12 * Kay Sievers <kay.sievers@vrfy.org>
13 * Arjan van de Ven <arjanv@redhat.com> 13 * Arjan van de Ven <arjanv@redhat.com>
14 * Greg Kroah-Hartman <greg@kroah.com> 14 * Greg Kroah-Hartman <greg@kroah.com>
15 */ 15 */
16 16
17 #include <linux/spinlock.h> 17 #include <linux/spinlock.h>
18 #include <linux/string.h> 18 #include <linux/string.h>
19 #include <linux/kobject.h> 19 #include <linux/kobject.h>
20 #include <linux/module.h> 20 #include <linux/module.h>
21 #include <linux/slab.h> 21 #include <linux/slab.h>
22 22 #include <linux/user_namespace.h>
23 #include <linux/socket.h> 23 #include <linux/socket.h>
24 #include <linux/skbuff.h> 24 #include <linux/skbuff.h>
25 #include <linux/netlink.h> 25 #include <linux/netlink.h>
26 #include <net/sock.h> 26 #include <net/sock.h>
27 #include <net/net_namespace.h> 27 #include <net/net_namespace.h>
28 28
29 29
30 u64 uevent_seqnum; 30 u64 uevent_seqnum;
31 char uevent_helper[UEVENT_HELPER_PATH_LEN] = CONFIG_UEVENT_HELPER_PATH; 31 char uevent_helper[UEVENT_HELPER_PATH_LEN] = CONFIG_UEVENT_HELPER_PATH;
32 static DEFINE_SPINLOCK(sequence_lock); 32 static DEFINE_SPINLOCK(sequence_lock);
33 #ifdef CONFIG_NET 33 #ifdef CONFIG_NET
34 struct uevent_sock { 34 struct uevent_sock {
35 struct list_head list; 35 struct list_head list;
36 struct sock *sk; 36 struct sock *sk;
37 }; 37 };
38 static LIST_HEAD(uevent_sock_list); 38 static LIST_HEAD(uevent_sock_list);
39 static DEFINE_MUTEX(uevent_sock_mutex); 39 static DEFINE_MUTEX(uevent_sock_mutex);
40 #endif 40 #endif
41 41
42 /* the strings here must match the enum in include/linux/kobject.h */ 42 /* the strings here must match the enum in include/linux/kobject.h */
43 static const char *kobject_actions[] = { 43 static const char *kobject_actions[] = {
44 [KOBJ_ADD] = "add", 44 [KOBJ_ADD] = "add",
45 [KOBJ_REMOVE] = "remove", 45 [KOBJ_REMOVE] = "remove",
46 [KOBJ_CHANGE] = "change", 46 [KOBJ_CHANGE] = "change",
47 [KOBJ_MOVE] = "move", 47 [KOBJ_MOVE] = "move",
48 [KOBJ_ONLINE] = "online", 48 [KOBJ_ONLINE] = "online",
49 [KOBJ_OFFLINE] = "offline", 49 [KOBJ_OFFLINE] = "offline",
50 }; 50 };
51 51
52 /** 52 /**
53 * kobject_action_type - translate action string to numeric type 53 * kobject_action_type - translate action string to numeric type
54 * 54 *
55 * @buf: buffer containing the action string, newline is ignored 55 * @buf: buffer containing the action string, newline is ignored
56 * @len: length of buffer 56 * @len: length of buffer
57 * @type: pointer to the location to store the action type 57 * @type: pointer to the location to store the action type
58 * 58 *
59 * Returns 0 if the action string was recognized. 59 * Returns 0 if the action string was recognized.
60 */ 60 */
61 int kobject_action_type(const char *buf, size_t count, 61 int kobject_action_type(const char *buf, size_t count,
62 enum kobject_action *type) 62 enum kobject_action *type)
63 { 63 {
64 enum kobject_action action; 64 enum kobject_action action;
65 int ret = -EINVAL; 65 int ret = -EINVAL;
66 66
67 if (count && (buf[count-1] == '\n' || buf[count-1] == '\0')) 67 if (count && (buf[count-1] == '\n' || buf[count-1] == '\0'))
68 count--; 68 count--;
69 69
70 if (!count) 70 if (!count)
71 goto out; 71 goto out;
72 72
73 for (action = 0; action < ARRAY_SIZE(kobject_actions); action++) { 73 for (action = 0; action < ARRAY_SIZE(kobject_actions); action++) {
74 if (strncmp(kobject_actions[action], buf, count) != 0) 74 if (strncmp(kobject_actions[action], buf, count) != 0)
75 continue; 75 continue;
76 if (kobject_actions[action][count] != '\0') 76 if (kobject_actions[action][count] != '\0')
77 continue; 77 continue;
78 *type = action; 78 *type = action;
79 ret = 0; 79 ret = 0;
80 break; 80 break;
81 } 81 }
82 out: 82 out:
83 return ret; 83 return ret;
84 } 84 }
85 85
86 static int kobj_bcast_filter(struct sock *dsk, struct sk_buff *skb, void *data) 86 static int kobj_bcast_filter(struct sock *dsk, struct sk_buff *skb, void *data)
87 { 87 {
88 struct kobject *kobj = data; 88 struct kobject *kobj = data;
89 const struct kobj_ns_type_operations *ops; 89 const struct kobj_ns_type_operations *ops;
90 90
91 ops = kobj_ns_ops(kobj); 91 ops = kobj_ns_ops(kobj);
92 if (ops) { 92 if (ops) {
93 const void *sock_ns, *ns; 93 const void *sock_ns, *ns;
94 ns = kobj->ktype->namespace(kobj); 94 ns = kobj->ktype->namespace(kobj);
95 sock_ns = ops->netlink_ns(dsk); 95 sock_ns = ops->netlink_ns(dsk);
96 return sock_ns != ns; 96 return sock_ns != ns;
97 } 97 }
98 98
99 return 0; 99 return 0;
100 } 100 }
101 101
102 static int kobj_usermode_filter(struct kobject *kobj)
103 {
104 const struct kobj_ns_type_operations *ops;
105
106 ops = kobj_ns_ops(kobj);
107 if (ops) {
108 const void *init_ns, *ns;
109 ns = kobj->ktype->namespace(kobj);
110 init_ns = ops->initial_ns();
111 return ns != init_ns;
112 }
113
114 return 0;
115 }
116
102 /** 117 /**
103 * kobject_uevent_env - send an uevent with environmental data 118 * kobject_uevent_env - send an uevent with environmental data
104 * 119 *
105 * @action: action that is happening 120 * @action: action that is happening
106 * @kobj: struct kobject that the action is happening to 121 * @kobj: struct kobject that the action is happening to
107 * @envp_ext: pointer to environmental data 122 * @envp_ext: pointer to environmental data
108 * 123 *
109 * Returns 0 if kobject_uevent() is completed with success or the 124 * Returns 0 if kobject_uevent() is completed with success or the
110 * corresponding error when it fails. 125 * corresponding error when it fails.
111 */ 126 */
112 int kobject_uevent_env(struct kobject *kobj, enum kobject_action action, 127 int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
113 char *envp_ext[]) 128 char *envp_ext[])
114 { 129 {
115 struct kobj_uevent_env *env; 130 struct kobj_uevent_env *env;
116 const char *action_string = kobject_actions[action]; 131 const char *action_string = kobject_actions[action];
117 const char *devpath = NULL; 132 const char *devpath = NULL;
118 const char *subsystem; 133 const char *subsystem;
119 struct kobject *top_kobj; 134 struct kobject *top_kobj;
120 struct kset *kset; 135 struct kset *kset;
121 const struct kset_uevent_ops *uevent_ops; 136 const struct kset_uevent_ops *uevent_ops;
122 u64 seq; 137 u64 seq;
123 int i = 0; 138 int i = 0;
124 int retval = 0; 139 int retval = 0;
125 #ifdef CONFIG_NET 140 #ifdef CONFIG_NET
126 struct uevent_sock *ue_sk; 141 struct uevent_sock *ue_sk;
127 #endif 142 #endif
128 143
129 pr_debug("kobject: '%s' (%p): %s\n", 144 pr_debug("kobject: '%s' (%p): %s\n",
130 kobject_name(kobj), kobj, __func__); 145 kobject_name(kobj), kobj, __func__);
131 146
132 /* search the kset we belong to */ 147 /* search the kset we belong to */
133 top_kobj = kobj; 148 top_kobj = kobj;
134 while (!top_kobj->kset && top_kobj->parent) 149 while (!top_kobj->kset && top_kobj->parent)
135 top_kobj = top_kobj->parent; 150 top_kobj = top_kobj->parent;
136 151
137 if (!top_kobj->kset) { 152 if (!top_kobj->kset) {
138 pr_debug("kobject: '%s' (%p): %s: attempted to send uevent " 153 pr_debug("kobject: '%s' (%p): %s: attempted to send uevent "
139 "without kset!\n", kobject_name(kobj), kobj, 154 "without kset!\n", kobject_name(kobj), kobj,
140 __func__); 155 __func__);
141 return -EINVAL; 156 return -EINVAL;
142 } 157 }
143 158
144 kset = top_kobj->kset; 159 kset = top_kobj->kset;
145 uevent_ops = kset->uevent_ops; 160 uevent_ops = kset->uevent_ops;
146 161
147 /* skip the event, if uevent_suppress is set*/ 162 /* skip the event, if uevent_suppress is set*/
148 if (kobj->uevent_suppress) { 163 if (kobj->uevent_suppress) {
149 pr_debug("kobject: '%s' (%p): %s: uevent_suppress " 164 pr_debug("kobject: '%s' (%p): %s: uevent_suppress "
150 "caused the event to drop!\n", 165 "caused the event to drop!\n",
151 kobject_name(kobj), kobj, __func__); 166 kobject_name(kobj), kobj, __func__);
152 return 0; 167 return 0;
153 } 168 }
154 /* skip the event, if the filter returns zero. */ 169 /* skip the event, if the filter returns zero. */
155 if (uevent_ops && uevent_ops->filter) 170 if (uevent_ops && uevent_ops->filter)
156 if (!uevent_ops->filter(kset, kobj)) { 171 if (!uevent_ops->filter(kset, kobj)) {
157 pr_debug("kobject: '%s' (%p): %s: filter function " 172 pr_debug("kobject: '%s' (%p): %s: filter function "
158 "caused the event to drop!\n", 173 "caused the event to drop!\n",
159 kobject_name(kobj), kobj, __func__); 174 kobject_name(kobj), kobj, __func__);
160 return 0; 175 return 0;
161 } 176 }
162 177
163 /* originating subsystem */ 178 /* originating subsystem */
164 if (uevent_ops && uevent_ops->name) 179 if (uevent_ops && uevent_ops->name)
165 subsystem = uevent_ops->name(kset, kobj); 180 subsystem = uevent_ops->name(kset, kobj);
166 else 181 else
167 subsystem = kobject_name(&kset->kobj); 182 subsystem = kobject_name(&kset->kobj);
168 if (!subsystem) { 183 if (!subsystem) {
169 pr_debug("kobject: '%s' (%p): %s: unset subsystem caused the " 184 pr_debug("kobject: '%s' (%p): %s: unset subsystem caused the "
170 "event to drop!\n", kobject_name(kobj), kobj, 185 "event to drop!\n", kobject_name(kobj), kobj,
171 __func__); 186 __func__);
172 return 0; 187 return 0;
173 } 188 }
174 189
175 /* environment buffer */ 190 /* environment buffer */
176 env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); 191 env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
177 if (!env) 192 if (!env)
178 return -ENOMEM; 193 return -ENOMEM;
179 194
180 /* complete object path */ 195 /* complete object path */
181 devpath = kobject_get_path(kobj, GFP_KERNEL); 196 devpath = kobject_get_path(kobj, GFP_KERNEL);
182 if (!devpath) { 197 if (!devpath) {
183 retval = -ENOENT; 198 retval = -ENOENT;
184 goto exit; 199 goto exit;
185 } 200 }
186 201
187 /* default keys */ 202 /* default keys */
188 retval = add_uevent_var(env, "ACTION=%s", action_string); 203 retval = add_uevent_var(env, "ACTION=%s", action_string);
189 if (retval) 204 if (retval)
190 goto exit; 205 goto exit;
191 retval = add_uevent_var(env, "DEVPATH=%s", devpath); 206 retval = add_uevent_var(env, "DEVPATH=%s", devpath);
192 if (retval) 207 if (retval)
193 goto exit; 208 goto exit;
194 retval = add_uevent_var(env, "SUBSYSTEM=%s", subsystem); 209 retval = add_uevent_var(env, "SUBSYSTEM=%s", subsystem);
195 if (retval) 210 if (retval)
196 goto exit; 211 goto exit;
197 212
198 /* keys passed in from the caller */ 213 /* keys passed in from the caller */
199 if (envp_ext) { 214 if (envp_ext) {
200 for (i = 0; envp_ext[i]; i++) { 215 for (i = 0; envp_ext[i]; i++) {
201 retval = add_uevent_var(env, "%s", envp_ext[i]); 216 retval = add_uevent_var(env, "%s", envp_ext[i]);
202 if (retval) 217 if (retval)
203 goto exit; 218 goto exit;
204 } 219 }
205 } 220 }
206 221
207 /* let the kset specific function add its stuff */ 222 /* let the kset specific function add its stuff */
208 if (uevent_ops && uevent_ops->uevent) { 223 if (uevent_ops && uevent_ops->uevent) {
209 retval = uevent_ops->uevent(kset, kobj, env); 224 retval = uevent_ops->uevent(kset, kobj, env);
210 if (retval) { 225 if (retval) {
211 pr_debug("kobject: '%s' (%p): %s: uevent() returned " 226 pr_debug("kobject: '%s' (%p): %s: uevent() returned "
212 "%d\n", kobject_name(kobj), kobj, 227 "%d\n", kobject_name(kobj), kobj,
213 __func__, retval); 228 __func__, retval);
214 goto exit; 229 goto exit;
215 } 230 }
216 } 231 }
217 232
218 /* 233 /*
219 * Mark "add" and "remove" events in the object to ensure proper 234 * Mark "add" and "remove" events in the object to ensure proper
220 * events to userspace during automatic cleanup. If the object did 235 * events to userspace during automatic cleanup. If the object did
221 * send an "add" event, "remove" will automatically generated by 236 * send an "add" event, "remove" will automatically generated by
222 * the core, if not already done by the caller. 237 * the core, if not already done by the caller.
223 */ 238 */
224 if (action == KOBJ_ADD) 239 if (action == KOBJ_ADD)
225 kobj->state_add_uevent_sent = 1; 240 kobj->state_add_uevent_sent = 1;
226 else if (action == KOBJ_REMOVE) 241 else if (action == KOBJ_REMOVE)
227 kobj->state_remove_uevent_sent = 1; 242 kobj->state_remove_uevent_sent = 1;
228 243
229 /* we will send an event, so request a new sequence number */ 244 /* we will send an event, so request a new sequence number */
230 spin_lock(&sequence_lock); 245 spin_lock(&sequence_lock);
231 seq = ++uevent_seqnum; 246 seq = ++uevent_seqnum;
232 spin_unlock(&sequence_lock); 247 spin_unlock(&sequence_lock);
233 retval = add_uevent_var(env, "SEQNUM=%llu", (unsigned long long)seq); 248 retval = add_uevent_var(env, "SEQNUM=%llu", (unsigned long long)seq);
234 if (retval) 249 if (retval)
235 goto exit; 250 goto exit;
236 251
237 #if defined(CONFIG_NET) 252 #if defined(CONFIG_NET)
238 /* send netlink message */ 253 /* send netlink message */
239 mutex_lock(&uevent_sock_mutex); 254 mutex_lock(&uevent_sock_mutex);
240 list_for_each_entry(ue_sk, &uevent_sock_list, list) { 255 list_for_each_entry(ue_sk, &uevent_sock_list, list) {
241 struct sock *uevent_sock = ue_sk->sk; 256 struct sock *uevent_sock = ue_sk->sk;
242 struct sk_buff *skb; 257 struct sk_buff *skb;
243 size_t len; 258 size_t len;
244 259
245 /* allocate message with the maximum possible size */ 260 /* allocate message with the maximum possible size */
246 len = strlen(action_string) + strlen(devpath) + 2; 261 len = strlen(action_string) + strlen(devpath) + 2;
247 skb = alloc_skb(len + env->buflen, GFP_KERNEL); 262 skb = alloc_skb(len + env->buflen, GFP_KERNEL);
248 if (skb) { 263 if (skb) {
249 char *scratch; 264 char *scratch;
250 265
251 /* add header */ 266 /* add header */
252 scratch = skb_put(skb, len); 267 scratch = skb_put(skb, len);
253 sprintf(scratch, "%s@%s", action_string, devpath); 268 sprintf(scratch, "%s@%s", action_string, devpath);
254 269
255 /* copy keys to our continuous event payload buffer */ 270 /* copy keys to our continuous event payload buffer */
256 for (i = 0; i < env->envp_idx; i++) { 271 for (i = 0; i < env->envp_idx; i++) {
257 len = strlen(env->envp[i]) + 1; 272 len = strlen(env->envp[i]) + 1;
258 scratch = skb_put(skb, len); 273 scratch = skb_put(skb, len);
259 strcpy(scratch, env->envp[i]); 274 strcpy(scratch, env->envp[i]);
260 } 275 }
261 276
262 NETLINK_CB(skb).dst_group = 1; 277 NETLINK_CB(skb).dst_group = 1;
263 retval = netlink_broadcast_filtered(uevent_sock, skb, 278 retval = netlink_broadcast_filtered(uevent_sock, skb,
264 0, 1, GFP_KERNEL, 279 0, 1, GFP_KERNEL,
265 kobj_bcast_filter, 280 kobj_bcast_filter,
266 kobj); 281 kobj);
267 /* ENOBUFS should be handled in userspace */ 282 /* ENOBUFS should be handled in userspace */
268 if (retval == -ENOBUFS) 283 if (retval == -ENOBUFS)
269 retval = 0; 284 retval = 0;
270 } else 285 } else
271 retval = -ENOMEM; 286 retval = -ENOMEM;
272 } 287 }
273 mutex_unlock(&uevent_sock_mutex); 288 mutex_unlock(&uevent_sock_mutex);
274 #endif 289 #endif
275 290
276 /* call uevent_helper, usually only enabled during early boot */ 291 /* call uevent_helper, usually only enabled during early boot */
277 if (uevent_helper[0]) { 292 if (uevent_helper[0] && !kobj_usermode_filter(kobj)) {
278 char *argv [3]; 293 char *argv [3];
279 294
280 argv [0] = uevent_helper; 295 argv [0] = uevent_helper;
281 argv [1] = (char *)subsystem; 296 argv [1] = (char *)subsystem;
282 argv [2] = NULL; 297 argv [2] = NULL;
283 retval = add_uevent_var(env, "HOME=/"); 298 retval = add_uevent_var(env, "HOME=/");
284 if (retval) 299 if (retval)
285 goto exit; 300 goto exit;
286 retval = add_uevent_var(env, 301 retval = add_uevent_var(env,
287 "PATH=/sbin:/bin:/usr/sbin:/usr/bin"); 302 "PATH=/sbin:/bin:/usr/sbin:/usr/bin");
288 if (retval) 303 if (retval)
289 goto exit; 304 goto exit;
290 305
291 retval = call_usermodehelper(argv[0], argv, 306 retval = call_usermodehelper(argv[0], argv,
292 env->envp, UMH_WAIT_EXEC); 307 env->envp, UMH_WAIT_EXEC);
293 } 308 }
294 309
295 exit: 310 exit:
296 kfree(devpath); 311 kfree(devpath);
297 kfree(env); 312 kfree(env);
298 return retval; 313 return retval;
299 } 314 }
300 EXPORT_SYMBOL_GPL(kobject_uevent_env); 315 EXPORT_SYMBOL_GPL(kobject_uevent_env);
301 316
302 /** 317 /**
303 * kobject_uevent - notify userspace by ending an uevent 318 * kobject_uevent - notify userspace by ending an uevent
304 * 319 *
305 * @action: action that is happening 320 * @action: action that is happening
306 * @kobj: struct kobject that the action is happening to 321 * @kobj: struct kobject that the action is happening to
307 * 322 *
308 * Returns 0 if kobject_uevent() is completed with success or the 323 * Returns 0 if kobject_uevent() is completed with success or the
309 * corresponding error when it fails. 324 * corresponding error when it fails.
310 */ 325 */
311 int kobject_uevent(struct kobject *kobj, enum kobject_action action) 326 int kobject_uevent(struct kobject *kobj, enum kobject_action action)
312 { 327 {
313 return kobject_uevent_env(kobj, action, NULL); 328 return kobject_uevent_env(kobj, action, NULL);
314 } 329 }
315 EXPORT_SYMBOL_GPL(kobject_uevent); 330 EXPORT_SYMBOL_GPL(kobject_uevent);
316 331
317 /** 332 /**
318 * add_uevent_var - add key value string to the environment buffer 333 * add_uevent_var - add key value string to the environment buffer
319 * @env: environment buffer structure 334 * @env: environment buffer structure
320 * @format: printf format for the key=value pair 335 * @format: printf format for the key=value pair
321 * 336 *
322 * Returns 0 if environment variable was added successfully or -ENOMEM 337 * Returns 0 if environment variable was added successfully or -ENOMEM
323 * if no space was available. 338 * if no space was available.
324 */ 339 */
325 int add_uevent_var(struct kobj_uevent_env *env, const char *format, ...) 340 int add_uevent_var(struct kobj_uevent_env *env, const char *format, ...)
326 { 341 {
327 va_list args; 342 va_list args;
328 int len; 343 int len;
329 344
330 if (env->envp_idx >= ARRAY_SIZE(env->envp)) { 345 if (env->envp_idx >= ARRAY_SIZE(env->envp)) {
331 WARN(1, KERN_ERR "add_uevent_var: too many keys\n"); 346 WARN(1, KERN_ERR "add_uevent_var: too many keys\n");
332 return -ENOMEM; 347 return -ENOMEM;
333 } 348 }
334 349
335 va_start(args, format); 350 va_start(args, format);
336 len = vsnprintf(&env->buf[env->buflen], 351 len = vsnprintf(&env->buf[env->buflen],
337 sizeof(env->buf) - env->buflen, 352 sizeof(env->buf) - env->buflen,
338 format, args); 353 format, args);
339 va_end(args); 354 va_end(args);
340 355
341 if (len >= (sizeof(env->buf) - env->buflen)) { 356 if (len >= (sizeof(env->buf) - env->buflen)) {
342 WARN(1, KERN_ERR "add_uevent_var: buffer size too small\n"); 357 WARN(1, KERN_ERR "add_uevent_var: buffer size too small\n");
343 return -ENOMEM; 358 return -ENOMEM;
344 } 359 }
345 360
346 env->envp[env->envp_idx++] = &env->buf[env->buflen]; 361 env->envp[env->envp_idx++] = &env->buf[env->buflen];
347 env->buflen += len + 1; 362 env->buflen += len + 1;
348 return 0; 363 return 0;
349 } 364 }
350 EXPORT_SYMBOL_GPL(add_uevent_var); 365 EXPORT_SYMBOL_GPL(add_uevent_var);
351 366
352 #if defined(CONFIG_NET) 367 #if defined(CONFIG_NET)
353 static int uevent_net_init(struct net *net) 368 static int uevent_net_init(struct net *net)
354 { 369 {
355 struct uevent_sock *ue_sk; 370 struct uevent_sock *ue_sk;
356 371
357 ue_sk = kzalloc(sizeof(*ue_sk), GFP_KERNEL); 372 ue_sk = kzalloc(sizeof(*ue_sk), GFP_KERNEL);
358 if (!ue_sk) 373 if (!ue_sk)
359 return -ENOMEM; 374 return -ENOMEM;
360 375
361 ue_sk->sk = netlink_kernel_create(net, NETLINK_KOBJECT_UEVENT, 376 ue_sk->sk = netlink_kernel_create(net, NETLINK_KOBJECT_UEVENT,
362 1, NULL, NULL, THIS_MODULE); 377 1, NULL, NULL, THIS_MODULE);
363 if (!ue_sk->sk) { 378 if (!ue_sk->sk) {
364 printk(KERN_ERR 379 printk(KERN_ERR
365 "kobject_uevent: unable to create netlink socket!\n"); 380 "kobject_uevent: unable to create netlink socket!\n");
366 return -ENODEV; 381 return -ENODEV;
367 } 382 }
368 mutex_lock(&uevent_sock_mutex); 383 mutex_lock(&uevent_sock_mutex);
369 list_add_tail(&ue_sk->list, &uevent_sock_list); 384 list_add_tail(&ue_sk->list, &uevent_sock_list);
370 mutex_unlock(&uevent_sock_mutex); 385 mutex_unlock(&uevent_sock_mutex);
371 return 0; 386 return 0;
372 } 387 }
373 388
374 static void uevent_net_exit(struct net *net) 389 static void uevent_net_exit(struct net *net)
375 { 390 {
376 struct uevent_sock *ue_sk; 391 struct uevent_sock *ue_sk;
377 392
378 mutex_lock(&uevent_sock_mutex); 393 mutex_lock(&uevent_sock_mutex);
379 list_for_each_entry(ue_sk, &uevent_sock_list, list) { 394 list_for_each_entry(ue_sk, &uevent_sock_list, list) {
380 if (sock_net(ue_sk->sk) == net) 395 if (sock_net(ue_sk->sk) == net)
381 goto found; 396 goto found;
382 } 397 }
383 mutex_unlock(&uevent_sock_mutex); 398 mutex_unlock(&uevent_sock_mutex);
384 return; 399 return;
385 400
386 found: 401 found:
387 list_del(&ue_sk->list); 402 list_del(&ue_sk->list);
388 mutex_unlock(&uevent_sock_mutex); 403 mutex_unlock(&uevent_sock_mutex);
389 404
390 netlink_kernel_release(ue_sk->sk); 405 netlink_kernel_release(ue_sk->sk);
391 kfree(ue_sk); 406 kfree(ue_sk);
392 } 407 }
393 408
394 static struct pernet_operations uevent_net_ops = { 409 static struct pernet_operations uevent_net_ops = {
395 .init = uevent_net_init, 410 .init = uevent_net_init,
396 .exit = uevent_net_exit, 411 .exit = uevent_net_exit,
397 }; 412 };
398 413
399 static int __init kobject_uevent_init(void) 414 static int __init kobject_uevent_init(void)
400 { 415 {
401 netlink_set_nonroot(NETLINK_KOBJECT_UEVENT, NL_NONROOT_RECV); 416 netlink_set_nonroot(NETLINK_KOBJECT_UEVENT, NL_NONROOT_RECV);
402 return register_pernet_subsys(&uevent_net_ops); 417 return register_pernet_subsys(&uevent_net_ops);
403 } 418 }
404 419
405 420
406 postcore_initcall(kobject_uevent_init); 421 postcore_initcall(kobject_uevent_init);
407 #endif 422 #endif
408 423