1 // SPDX-License-Identifier: GPL-2.0-only 1 // SPDX-License-Identifier: GPL-2.0-only
2 2
3 #include <linux/stat.h> 3 #include <linux/stat.h>
4 #include <linux/sysctl.h> 4 #include <linux/sysctl.h>
5 #include <linux/slab.h> 5 #include <linux/slab.h>
6 #include <linux/cred.h> 6 #include <linux/cred.h>
7 #include <linux/hash.h> 7 #include <linux/hash.h>
8 #include <linux/kmemleak.h> 8 #include <linux/kmemleak.h>
9 #include <linux/user_namespace.h> 9 #include <linux/user_namespace.h>
10 10
11 struct ucounts init_ucounts = { 11 struct ucounts init_ucounts = {
12 .ns = &init_user_ns, 12 .ns = &init_user_ns,
13 .uid = GLOBAL_ROOT_UID, 13 .uid = GLOBAL_ROOT_UID,
14 .count = ATOMIC_INIT(1), 14 .count = ATOMIC_INIT(1),
15 }; 15 };
16 16
17 #define UCOUNTS_HASHTABLE_BITS 10 17 #define UCOUNTS_HASHTABLE_BITS 10
18 static struct hlist_head ucounts_hashtable[(1 18 static struct hlist_head ucounts_hashtable[(1 << UCOUNTS_HASHTABLE_BITS)];
19 static DEFINE_SPINLOCK(ucounts_lock); 19 static DEFINE_SPINLOCK(ucounts_lock);
20 20
21 #define ucounts_hashfn(ns, uid) 21 #define ucounts_hashfn(ns, uid) \
22 hash_long((unsigned long)__kuid_val(ui 22 hash_long((unsigned long)__kuid_val(uid) + (unsigned long)(ns), \
23 UCOUNTS_HASHTABLE_BITS) 23 UCOUNTS_HASHTABLE_BITS)
24 #define ucounts_hashentry(ns, uid) \ 24 #define ucounts_hashentry(ns, uid) \
25 (ucounts_hashtable + ucounts_hashfn(ns 25 (ucounts_hashtable + ucounts_hashfn(ns, uid))
26 26
27 27
28 #ifdef CONFIG_SYSCTL 28 #ifdef CONFIG_SYSCTL
29 static struct ctl_table_set * 29 static struct ctl_table_set *
30 set_lookup(struct ctl_table_root *root) 30 set_lookup(struct ctl_table_root *root)
31 { 31 {
32 return ¤t_user_ns()->set; 32 return ¤t_user_ns()->set;
33 } 33 }
34 34
35 static int set_is_seen(struct ctl_table_set *s 35 static int set_is_seen(struct ctl_table_set *set)
36 { 36 {
37 return ¤t_user_ns()->set == set; 37 return ¤t_user_ns()->set == set;
38 } 38 }
39 39
40 static int set_permissions(struct ctl_table_he 40 static int set_permissions(struct ctl_table_header *head,
41 const struct ctl_ta 41 const struct ctl_table *table)
42 { 42 {
43 struct user_namespace *user_ns = 43 struct user_namespace *user_ns =
44 container_of(head->set, struct 44 container_of(head->set, struct user_namespace, set);
45 int mode; 45 int mode;
46 46
47 /* Allow users with CAP_SYS_RESOURCE u 47 /* Allow users with CAP_SYS_RESOURCE unrestrained access */
48 if (ns_capable(user_ns, CAP_SYS_RESOUR 48 if (ns_capable(user_ns, CAP_SYS_RESOURCE))
49 mode = (table->mode & S_IRWXU) 49 mode = (table->mode & S_IRWXU) >> 6;
50 else 50 else
51 /* Allow all others at most read-only 51 /* Allow all others at most read-only access */
52 mode = table->mode & S_IROTH; 52 mode = table->mode & S_IROTH;
53 return (mode << 6) | (mode << 3) | mod 53 return (mode << 6) | (mode << 3) | mode;
54 } 54 }
55 55
56 static struct ctl_table_root set_root = { 56 static struct ctl_table_root set_root = {
57 .lookup = set_lookup, 57 .lookup = set_lookup,
58 .permissions = set_permissions, 58 .permissions = set_permissions,
59 }; 59 };
60 60
61 static long ue_zero = 0; 61 static long ue_zero = 0;
62 static long ue_int_max = INT_MAX; 62 static long ue_int_max = INT_MAX;
63 63
64 #define UCOUNT_ENTRY(name) 64 #define UCOUNT_ENTRY(name) \
65 { 65 { \
66 .procname = name, 66 .procname = name, \
67 .maxlen = sizeof(long) 67 .maxlen = sizeof(long), \
68 .mode = 0644, 68 .mode = 0644, \
69 .proc_handler = proc_doulong 69 .proc_handler = proc_doulongvec_minmax, \
70 .extra1 = &ue_zero, 70 .extra1 = &ue_zero, \
71 .extra2 = &ue_int_max, 71 .extra2 = &ue_int_max, \
72 } 72 }
73 static struct ctl_table user_table[] = { 73 static struct ctl_table user_table[] = {
74 UCOUNT_ENTRY("max_user_namespaces"), 74 UCOUNT_ENTRY("max_user_namespaces"),
75 UCOUNT_ENTRY("max_pid_namespaces"), 75 UCOUNT_ENTRY("max_pid_namespaces"),
76 UCOUNT_ENTRY("max_uts_namespaces"), 76 UCOUNT_ENTRY("max_uts_namespaces"),
77 UCOUNT_ENTRY("max_ipc_namespaces"), 77 UCOUNT_ENTRY("max_ipc_namespaces"),
78 UCOUNT_ENTRY("max_net_namespaces"), 78 UCOUNT_ENTRY("max_net_namespaces"),
79 UCOUNT_ENTRY("max_mnt_namespaces"), 79 UCOUNT_ENTRY("max_mnt_namespaces"),
80 UCOUNT_ENTRY("max_cgroup_namespaces"), 80 UCOUNT_ENTRY("max_cgroup_namespaces"),
81 UCOUNT_ENTRY("max_time_namespaces"), 81 UCOUNT_ENTRY("max_time_namespaces"),
82 #ifdef CONFIG_INOTIFY_USER 82 #ifdef CONFIG_INOTIFY_USER
83 UCOUNT_ENTRY("max_inotify_instances"), 83 UCOUNT_ENTRY("max_inotify_instances"),
84 UCOUNT_ENTRY("max_inotify_watches"), 84 UCOUNT_ENTRY("max_inotify_watches"),
85 #endif 85 #endif
86 #ifdef CONFIG_FANOTIFY 86 #ifdef CONFIG_FANOTIFY
87 UCOUNT_ENTRY("max_fanotify_groups"), 87 UCOUNT_ENTRY("max_fanotify_groups"),
88 UCOUNT_ENTRY("max_fanotify_marks"), 88 UCOUNT_ENTRY("max_fanotify_marks"),
89 #endif 89 #endif
90 }; 90 };
91 #endif /* CONFIG_SYSCTL */ 91 #endif /* CONFIG_SYSCTL */
92 92
93 bool setup_userns_sysctls(struct user_namespac 93 bool setup_userns_sysctls(struct user_namespace *ns)
94 { 94 {
95 #ifdef CONFIG_SYSCTL 95 #ifdef CONFIG_SYSCTL
96 struct ctl_table *tbl; 96 struct ctl_table *tbl;
97 97
98 BUILD_BUG_ON(ARRAY_SIZE(user_table) != 98 BUILD_BUG_ON(ARRAY_SIZE(user_table) != UCOUNT_COUNTS);
99 setup_sysctl_set(&ns->set, &set_root, 99 setup_sysctl_set(&ns->set, &set_root, set_is_seen);
100 tbl = kmemdup(user_table, sizeof(user_ 100 tbl = kmemdup(user_table, sizeof(user_table), GFP_KERNEL);
101 if (tbl) { 101 if (tbl) {
102 int i; 102 int i;
103 for (i = 0; i < UCOUNT_COUNTS; 103 for (i = 0; i < UCOUNT_COUNTS; i++) {
104 tbl[i].data = &ns->uco 104 tbl[i].data = &ns->ucount_max[i];
105 } 105 }
106 ns->sysctls = __register_sysct 106 ns->sysctls = __register_sysctl_table(&ns->set, "user", tbl,
107 107 ARRAY_SIZE(user_table));
108 } 108 }
109 if (!ns->sysctls) { 109 if (!ns->sysctls) {
110 kfree(tbl); 110 kfree(tbl);
111 retire_sysctl_set(&ns->set); 111 retire_sysctl_set(&ns->set);
112 return false; 112 return false;
113 } 113 }
114 #endif 114 #endif
115 return true; 115 return true;
116 } 116 }
117 117
118 void retire_userns_sysctls(struct user_namespa 118 void retire_userns_sysctls(struct user_namespace *ns)
119 { 119 {
120 #ifdef CONFIG_SYSCTL 120 #ifdef CONFIG_SYSCTL
121 const struct ctl_table *tbl; 121 const struct ctl_table *tbl;
122 122
123 tbl = ns->sysctls->ctl_table_arg; 123 tbl = ns->sysctls->ctl_table_arg;
124 unregister_sysctl_table(ns->sysctls); 124 unregister_sysctl_table(ns->sysctls);
125 retire_sysctl_set(&ns->set); 125 retire_sysctl_set(&ns->set);
126 kfree(tbl); 126 kfree(tbl);
127 #endif 127 #endif
128 } 128 }
129 129
130 static struct ucounts *find_ucounts(struct use 130 static struct ucounts *find_ucounts(struct user_namespace *ns, kuid_t uid, struct hlist_head *hashent)
131 { 131 {
132 struct ucounts *ucounts; 132 struct ucounts *ucounts;
133 133
134 hlist_for_each_entry(ucounts, hashent, 134 hlist_for_each_entry(ucounts, hashent, node) {
135 if (uid_eq(ucounts->uid, uid) 135 if (uid_eq(ucounts->uid, uid) && (ucounts->ns == ns))
136 return ucounts; 136 return ucounts;
137 } 137 }
138 return NULL; 138 return NULL;
139 } 139 }
140 140
141 static void hlist_add_ucounts(struct ucounts * 141 static void hlist_add_ucounts(struct ucounts *ucounts)
142 { 142 {
143 struct hlist_head *hashent = ucounts_h 143 struct hlist_head *hashent = ucounts_hashentry(ucounts->ns, ucounts->uid);
144 spin_lock_irq(&ucounts_lock); 144 spin_lock_irq(&ucounts_lock);
145 hlist_add_head(&ucounts->node, hashent 145 hlist_add_head(&ucounts->node, hashent);
146 spin_unlock_irq(&ucounts_lock); 146 spin_unlock_irq(&ucounts_lock);
147 } 147 }
148 148
149 static inline bool get_ucounts_or_wrap(struct 149 static inline bool get_ucounts_or_wrap(struct ucounts *ucounts)
150 { 150 {
151 /* Returns true on a successful get, f 151 /* Returns true on a successful get, false if the count wraps. */
152 return !atomic_add_negative(1, &ucount 152 return !atomic_add_negative(1, &ucounts->count);
153 } 153 }
154 154
155 struct ucounts *get_ucounts(struct ucounts *uc 155 struct ucounts *get_ucounts(struct ucounts *ucounts)
156 { 156 {
157 if (!get_ucounts_or_wrap(ucounts)) { 157 if (!get_ucounts_or_wrap(ucounts)) {
158 put_ucounts(ucounts); 158 put_ucounts(ucounts);
159 ucounts = NULL; 159 ucounts = NULL;
160 } 160 }
161 return ucounts; 161 return ucounts;
162 } 162 }
163 163
164 struct ucounts *alloc_ucounts(struct user_name 164 struct ucounts *alloc_ucounts(struct user_namespace *ns, kuid_t uid)
165 { 165 {
166 struct hlist_head *hashent = ucounts_h 166 struct hlist_head *hashent = ucounts_hashentry(ns, uid);
167 struct ucounts *ucounts, *new; 167 struct ucounts *ucounts, *new;
168 bool wrapped; 168 bool wrapped;
169 169
170 spin_lock_irq(&ucounts_lock); 170 spin_lock_irq(&ucounts_lock);
171 ucounts = find_ucounts(ns, uid, hashen 171 ucounts = find_ucounts(ns, uid, hashent);
172 if (!ucounts) { 172 if (!ucounts) {
173 spin_unlock_irq(&ucounts_lock) 173 spin_unlock_irq(&ucounts_lock);
174 174
175 new = kzalloc(sizeof(*new), GF 175 new = kzalloc(sizeof(*new), GFP_KERNEL);
176 if (!new) 176 if (!new)
177 return NULL; 177 return NULL;
178 178
179 new->ns = ns; 179 new->ns = ns;
180 new->uid = uid; 180 new->uid = uid;
181 atomic_set(&new->count, 1); 181 atomic_set(&new->count, 1);
182 182
183 spin_lock_irq(&ucounts_lock); 183 spin_lock_irq(&ucounts_lock);
184 ucounts = find_ucounts(ns, uid 184 ucounts = find_ucounts(ns, uid, hashent);
185 if (ucounts) { 185 if (ucounts) {
186 kfree(new); 186 kfree(new);
187 } else { 187 } else {
188 hlist_add_head(&new->n 188 hlist_add_head(&new->node, hashent);
189 get_user_ns(new->ns); 189 get_user_ns(new->ns);
190 spin_unlock_irq(&ucoun 190 spin_unlock_irq(&ucounts_lock);
191 return new; 191 return new;
192 } 192 }
193 } 193 }
194 wrapped = !get_ucounts_or_wrap(ucounts 194 wrapped = !get_ucounts_or_wrap(ucounts);
195 spin_unlock_irq(&ucounts_lock); 195 spin_unlock_irq(&ucounts_lock);
196 if (wrapped) { 196 if (wrapped) {
197 put_ucounts(ucounts); 197 put_ucounts(ucounts);
198 return NULL; 198 return NULL;
199 } 199 }
200 return ucounts; 200 return ucounts;
201 } 201 }
202 202
203 void put_ucounts(struct ucounts *ucounts) 203 void put_ucounts(struct ucounts *ucounts)
204 { 204 {
205 unsigned long flags; 205 unsigned long flags;
206 206
207 if (atomic_dec_and_lock_irqsave(&ucoun 207 if (atomic_dec_and_lock_irqsave(&ucounts->count, &ucounts_lock, flags)) {
208 hlist_del_init(&ucounts->node) 208 hlist_del_init(&ucounts->node);
209 spin_unlock_irqrestore(&ucount 209 spin_unlock_irqrestore(&ucounts_lock, flags);
210 put_user_ns(ucounts->ns); 210 put_user_ns(ucounts->ns);
211 kfree(ucounts); 211 kfree(ucounts);
212 } 212 }
213 } 213 }
214 214
215 static inline bool atomic_long_inc_below(atomi 215 static inline bool atomic_long_inc_below(atomic_long_t *v, int u)
216 { 216 {
217 long c, old; 217 long c, old;
218 c = atomic_long_read(v); 218 c = atomic_long_read(v);
219 for (;;) { 219 for (;;) {
220 if (unlikely(c >= u)) 220 if (unlikely(c >= u))
221 return false; 221 return false;
222 old = atomic_long_cmpxchg(v, c 222 old = atomic_long_cmpxchg(v, c, c+1);
223 if (likely(old == c)) 223 if (likely(old == c))
224 return true; 224 return true;
225 c = old; 225 c = old;
226 } 226 }
227 } 227 }
228 228
229 struct ucounts *inc_ucount(struct user_namespa 229 struct ucounts *inc_ucount(struct user_namespace *ns, kuid_t uid,
230 enum ucount_type ty 230 enum ucount_type type)
231 { 231 {
232 struct ucounts *ucounts, *iter, *bad; 232 struct ucounts *ucounts, *iter, *bad;
233 struct user_namespace *tns; 233 struct user_namespace *tns;
234 ucounts = alloc_ucounts(ns, uid); 234 ucounts = alloc_ucounts(ns, uid);
235 for (iter = ucounts; iter; iter = tns- 235 for (iter = ucounts; iter; iter = tns->ucounts) {
236 long max; 236 long max;
237 tns = iter->ns; 237 tns = iter->ns;
238 max = READ_ONCE(tns->ucount_ma 238 max = READ_ONCE(tns->ucount_max[type]);
239 if (!atomic_long_inc_below(&it 239 if (!atomic_long_inc_below(&iter->ucount[type], max))
240 goto fail; 240 goto fail;
241 } 241 }
242 return ucounts; 242 return ucounts;
243 fail: 243 fail:
244 bad = iter; 244 bad = iter;
245 for (iter = ucounts; iter != bad; iter 245 for (iter = ucounts; iter != bad; iter = iter->ns->ucounts)
246 atomic_long_dec(&iter->ucount[ 246 atomic_long_dec(&iter->ucount[type]);
247 247
248 put_ucounts(ucounts); 248 put_ucounts(ucounts);
249 return NULL; 249 return NULL;
250 } 250 }
251 251
252 void dec_ucount(struct ucounts *ucounts, enum 252 void dec_ucount(struct ucounts *ucounts, enum ucount_type type)
253 { 253 {
254 struct ucounts *iter; 254 struct ucounts *iter;
255 for (iter = ucounts; iter; iter = iter 255 for (iter = ucounts; iter; iter = iter->ns->ucounts) {
256 long dec = atomic_long_dec_if_ 256 long dec = atomic_long_dec_if_positive(&iter->ucount[type]);
257 WARN_ON_ONCE(dec < 0); 257 WARN_ON_ONCE(dec < 0);
258 } 258 }
259 put_ucounts(ucounts); 259 put_ucounts(ucounts);
260 } 260 }
261 261
262 long inc_rlimit_ucounts(struct ucounts *ucount 262 long inc_rlimit_ucounts(struct ucounts *ucounts, enum rlimit_type type, long v)
263 { 263 {
264 struct ucounts *iter; 264 struct ucounts *iter;
265 long max = LONG_MAX; 265 long max = LONG_MAX;
266 long ret = 0; 266 long ret = 0;
267 267
268 for (iter = ucounts; iter; iter = iter 268 for (iter = ucounts; iter; iter = iter->ns->ucounts) {
269 long new = atomic_long_add_ret 269 long new = atomic_long_add_return(v, &iter->rlimit[type]);
270 if (new < 0 || new > max) 270 if (new < 0 || new > max)
271 ret = LONG_MAX; 271 ret = LONG_MAX;
272 else if (iter == ucounts) 272 else if (iter == ucounts)
273 ret = new; 273 ret = new;
274 max = get_userns_rlimit_max(it 274 max = get_userns_rlimit_max(iter->ns, type);
275 } 275 }
276 return ret; 276 return ret;
277 } 277 }
278 278
279 bool dec_rlimit_ucounts(struct ucounts *ucount 279 bool dec_rlimit_ucounts(struct ucounts *ucounts, enum rlimit_type type, long v)
280 { 280 {
281 struct ucounts *iter; 281 struct ucounts *iter;
282 long new = -1; /* Silence compiler war 282 long new = -1; /* Silence compiler warning */
283 for (iter = ucounts; iter; iter = iter 283 for (iter = ucounts; iter; iter = iter->ns->ucounts) {
284 long dec = atomic_long_sub_ret 284 long dec = atomic_long_sub_return(v, &iter->rlimit[type]);
285 WARN_ON_ONCE(dec < 0); 285 WARN_ON_ONCE(dec < 0);
286 if (iter == ucounts) 286 if (iter == ucounts)
287 new = dec; 287 new = dec;
288 } 288 }
289 return (new == 0); 289 return (new == 0);
290 } 290 }
291 291
292 static void do_dec_rlimit_put_ucounts(struct u 292 static void do_dec_rlimit_put_ucounts(struct ucounts *ucounts,
293 struct ucounts 293 struct ucounts *last, enum rlimit_type type)
294 { 294 {
295 struct ucounts *iter, *next; 295 struct ucounts *iter, *next;
296 for (iter = ucounts; iter != last; ite 296 for (iter = ucounts; iter != last; iter = next) {
297 long dec = atomic_long_sub_ret 297 long dec = atomic_long_sub_return(1, &iter->rlimit[type]);
298 WARN_ON_ONCE(dec < 0); 298 WARN_ON_ONCE(dec < 0);
299 next = iter->ns->ucounts; 299 next = iter->ns->ucounts;
300 if (dec == 0) 300 if (dec == 0)
301 put_ucounts(iter); 301 put_ucounts(iter);
302 } 302 }
303 } 303 }
304 304
305 void dec_rlimit_put_ucounts(struct ucounts *uc 305 void dec_rlimit_put_ucounts(struct ucounts *ucounts, enum rlimit_type type)
306 { 306 {
307 do_dec_rlimit_put_ucounts(ucounts, NUL 307 do_dec_rlimit_put_ucounts(ucounts, NULL, type);
308 } 308 }
309 309
310 long inc_rlimit_get_ucounts(struct ucounts *uc 310 long inc_rlimit_get_ucounts(struct ucounts *ucounts, enum rlimit_type type)
311 { 311 {
312 /* Caller must hold a reference to uco 312 /* Caller must hold a reference to ucounts */
313 struct ucounts *iter; 313 struct ucounts *iter;
314 long max = LONG_MAX; 314 long max = LONG_MAX;
315 long dec, ret = 0; 315 long dec, ret = 0;
316 316
317 for (iter = ucounts; iter; iter = iter 317 for (iter = ucounts; iter; iter = iter->ns->ucounts) {
318 long new = atomic_long_add_ret 318 long new = atomic_long_add_return(1, &iter->rlimit[type]);
319 if (new < 0 || new > max) 319 if (new < 0 || new > max)
320 goto unwind; 320 goto unwind;
321 if (iter == ucounts) 321 if (iter == ucounts)
322 ret = new; 322 ret = new;
323 max = get_userns_rlimit_max(it 323 max = get_userns_rlimit_max(iter->ns, type);
324 /* 324 /*
325 * Grab an extra ucount refere 325 * Grab an extra ucount reference for the caller when
326 * the rlimit count was previo 326 * the rlimit count was previously 0.
327 */ 327 */
328 if (new != 1) 328 if (new != 1)
329 continue; 329 continue;
330 if (!get_ucounts(iter)) 330 if (!get_ucounts(iter))
331 goto dec_unwind; 331 goto dec_unwind;
332 } 332 }
333 return ret; 333 return ret;
334 dec_unwind: 334 dec_unwind:
335 dec = atomic_long_sub_return(1, &iter- 335 dec = atomic_long_sub_return(1, &iter->rlimit[type]);
336 WARN_ON_ONCE(dec < 0); 336 WARN_ON_ONCE(dec < 0);
337 unwind: 337 unwind:
338 do_dec_rlimit_put_ucounts(ucounts, ite 338 do_dec_rlimit_put_ucounts(ucounts, iter, type);
339 return 0; 339 return 0;
340 } 340 }
341 341
342 bool is_rlimit_overlimit(struct ucounts *ucoun 342 bool is_rlimit_overlimit(struct ucounts *ucounts, enum rlimit_type type, unsigned long rlimit)
343 { 343 {
344 struct ucounts *iter; 344 struct ucounts *iter;
345 long max = rlimit; 345 long max = rlimit;
346 if (rlimit > LONG_MAX) 346 if (rlimit > LONG_MAX)
347 max = LONG_MAX; 347 max = LONG_MAX;
348 for (iter = ucounts; iter; iter = iter 348 for (iter = ucounts; iter; iter = iter->ns->ucounts) {
349 long val = get_rlimit_value(it 349 long val = get_rlimit_value(iter, type);
350 if (val < 0 || val > max) 350 if (val < 0 || val > max)
351 return true; 351 return true;
352 max = get_userns_rlimit_max(it 352 max = get_userns_rlimit_max(iter->ns, type);
353 } 353 }
354 return false; 354 return false;
355 } 355 }
356 356
357 static __init int user_namespace_sysctl_init(v 357 static __init int user_namespace_sysctl_init(void)
358 { 358 {
359 #ifdef CONFIG_SYSCTL 359 #ifdef CONFIG_SYSCTL
360 static struct ctl_table_header *user_h 360 static struct ctl_table_header *user_header;
361 static struct ctl_table empty[1]; 361 static struct ctl_table empty[1];
362 /* 362 /*
363 * It is necessary to register the use 363 * It is necessary to register the user directory in the
364 * default set so that registrations i 364 * default set so that registrations in the child sets work
365 * properly. 365 * properly.
366 */ 366 */
367 user_header = register_sysctl_sz("user 367 user_header = register_sysctl_sz("user", empty, 0);
368 kmemleak_ignore(user_header); 368 kmemleak_ignore(user_header);
369 BUG_ON(!user_header); 369 BUG_ON(!user_header);
370 BUG_ON(!setup_userns_sysctls(&init_use 370 BUG_ON(!setup_userns_sysctls(&init_user_ns));
371 #endif 371 #endif
372 hlist_add_ucounts(&init_ucounts); 372 hlist_add_ucounts(&init_ucounts);
373 inc_rlimit_ucounts(&init_ucounts, UCOU 373 inc_rlimit_ucounts(&init_ucounts, UCOUNT_RLIMIT_NPROC, 1);
374 return 0; 374 return 0;
375 } 375 }
376 subsys_initcall(user_namespace_sysctl_init); 376 subsys_initcall(user_namespace_sysctl_init);
377 377
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