[linux.git] / ipc / ipc_sysctl.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  Copyright (C) 2007
 *
 *  Author: Eric Biederman <[email protected]>
 */

#include <linux/module.h>
#include <linux/ipc.h>
#include <linux/nsproxy.h>
#include <linux/sysctl.h>
#include <linux/uaccess.h>
#include <linux/capability.h>
#include <linux/ipc_namespace.h>
#include <linux/msg.h>
#include <linux/slab.h>
#include "util.h"

static int proc_ipc_dointvec_minmax_orphans(struct ctl_table *table, int write,
		void *buffer, size_t *lenp, loff_t *ppos)
{
	struct ipc_namespace *ns =
		container_of(table->data, struct ipc_namespace, shm_rmid_forced);
	int err;

	err = proc_dointvec_minmax(table, write, buffer, lenp, ppos);

	if (err < 0)
		return err;
	if (ns->shm_rmid_forced)
		shm_destroy_orphaned(ns);
	return err;
}

static int proc_ipc_auto_msgmni(struct ctl_table *table, int write,
		void *buffer, size_t *lenp, loff_t *ppos)
{
	struct ctl_table ipc_table;
	int dummy = 0;

	memcpy(&ipc_table, table, sizeof(ipc_table));
	ipc_table.data = &dummy;

	if (write)
		pr_info_once("writing to auto_msgmni has no effect");

	return proc_dointvec_minmax(&ipc_table, write, buffer, lenp, ppos);
}

static int proc_ipc_sem_dointvec(struct ctl_table *table, int write,
	void *buffer, size_t *lenp, loff_t *ppos)
{
	struct ipc_namespace *ns =
		container_of(table->data, struct ipc_namespace, sem_ctls);
	int ret, semmni;

	semmni = ns->sem_ctls[3];
	ret = proc_dointvec(table, write, buffer, lenp, ppos);

	if (!ret)
		ret = sem_check_semmni(ns);

	/*
	 * Reset the semmni value if an error happens.
	 */
	if (ret)
		ns->sem_ctls[3] = semmni;
	return ret;
}

int ipc_mni = IPCMNI;
int ipc_mni_shift = IPCMNI_SHIFT;
int ipc_min_cycle = RADIX_TREE_MAP_SIZE;

static struct ctl_table ipc_sysctls[] = {
	{
		.procname	= "shmmax",
		.data		= &init_ipc_ns.shm_ctlmax,
		.maxlen		= sizeof(init_ipc_ns.shm_ctlmax),
		.mode		= 0644,
		.proc_handler	= proc_doulongvec_minmax,
	},
	{
		.procname	= "shmall",
		.data		= &init_ipc_ns.shm_ctlall,
		.maxlen		= sizeof(init_ipc_ns.shm_ctlall),
		.mode		= 0644,
		.proc_handler	= proc_doulongvec_minmax,
	},
	{
		.procname	= "shmmni",
		.data		= &init_ipc_ns.shm_ctlmni,
		.maxlen		= sizeof(init_ipc_ns.shm_ctlmni),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= SYSCTL_ZERO,
		.extra2		= &ipc_mni,
	},
	{
		.procname	= "shm_rmid_forced",
		.data		= &init_ipc_ns.shm_rmid_forced,
		.maxlen		= sizeof(init_ipc_ns.shm_rmid_forced),
		.mode		= 0644,
		.proc_handler	= proc_ipc_dointvec_minmax_orphans,
		.extra1		= SYSCTL_ZERO,
		.extra2		= SYSCTL_ONE,
	},
	{
		.procname	= "msgmax",
		.data		= &init_ipc_ns.msg_ctlmax,
		.maxlen		= sizeof(init_ipc_ns.msg_ctlmax),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= SYSCTL_ZERO,
		.extra2		= SYSCTL_INT_MAX,
	},
	{
		.procname	= "msgmni",
		.data		= &init_ipc_ns.msg_ctlmni,
		.maxlen		= sizeof(init_ipc_ns.msg_ctlmni),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= SYSCTL_ZERO,
		.extra2		= &ipc_mni,
	},
	{
		.procname	= "auto_msgmni",
		.data		= NULL,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_ipc_auto_msgmni,
		.extra1		= SYSCTL_ZERO,
		.extra2		= SYSCTL_ONE,
	},
	{
		.procname	=  "msgmnb",
		.data		= &init_ipc_ns.msg_ctlmnb,
		.maxlen		= sizeof(init_ipc_ns.msg_ctlmnb),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= SYSCTL_ZERO,
		.extra2		= SYSCTL_INT_MAX,
	},
	{
		.procname	= "sem",
		.data		= &init_ipc_ns.sem_ctls,
		.maxlen		= 4*sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_ipc_sem_dointvec,
	},
#ifdef CONFIG_CHECKPOINT_RESTORE
	{
		.procname	= "sem_next_id",
		.data		= &init_ipc_ns.ids[IPC_SEM_IDS].next_id,
		.maxlen		= sizeof(init_ipc_ns.ids[IPC_SEM_IDS].next_id),
		.mode		= 0444,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= SYSCTL_ZERO,
		.extra2		= SYSCTL_INT_MAX,
	},
	{
		.procname	= "msg_next_id",
		.data		= &init_ipc_ns.ids[IPC_MSG_IDS].next_id,
		.maxlen		= sizeof(init_ipc_ns.ids[IPC_MSG_IDS].next_id),
		.mode		= 0444,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= SYSCTL_ZERO,
		.extra2		= SYSCTL_INT_MAX,
	},
	{
		.procname	= "shm_next_id",
		.data		= &init_ipc_ns.ids[IPC_SHM_IDS].next_id,
		.maxlen		= sizeof(init_ipc_ns.ids[IPC_SHM_IDS].next_id),
		.mode		= 0444,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= SYSCTL_ZERO,
		.extra2		= SYSCTL_INT_MAX,
	},
#endif
	{}
};

static struct ctl_table_set *set_lookup(struct ctl_table_root *root)
{
	return &current->nsproxy->ipc_ns->ipc_set;
}

static int set_is_seen(struct ctl_table_set *set)
{
	return &current->nsproxy->ipc_ns->ipc_set == set;
}

static int ipc_permissions(struct ctl_table_header *head, struct ctl_table *table)
{
	int mode = table->mode;

#ifdef CONFIG_CHECKPOINT_RESTORE
	struct ipc_namespace *ns = current->nsproxy->ipc_ns;

	if (((table->data == &ns->ids[IPC_SEM_IDS].next_id) ||
	     (table->data == &ns->ids[IPC_MSG_IDS].next_id) ||
	     (table->data == &ns->ids[IPC_SHM_IDS].next_id)) &&
	    checkpoint_restore_ns_capable(ns->user_ns))
		mode = 0666;
#endif
	return mode;
}

static struct ctl_table_root set_root = {
	.lookup = set_lookup,
	.permissions = ipc_permissions,
};

bool setup_ipc_sysctls(struct ipc_namespace *ns)
{
	struct ctl_table *tbl;

	setup_sysctl_set(&ns->ipc_set, &set_root, set_is_seen);

	tbl = kmemdup(ipc_sysctls, sizeof(ipc_sysctls), GFP_KERNEL);
	if (tbl) {
		int i;

		for (i = 0; i < ARRAY_SIZE(ipc_sysctls); i++) {
			if (tbl[i].data == &init_ipc_ns.shm_ctlmax)
				tbl[i].data = &ns->shm_ctlmax;

			else if (tbl[i].data == &init_ipc_ns.shm_ctlall)
				tbl[i].data = &ns->shm_ctlall;

			else if (tbl[i].data == &init_ipc_ns.shm_ctlmni)
				tbl[i].data = &ns->shm_ctlmni;

			else if (tbl[i].data == &init_ipc_ns.shm_rmid_forced)
				tbl[i].data = &ns->shm_rmid_forced;

			else if (tbl[i].data == &init_ipc_ns.msg_ctlmax)
				tbl[i].data = &ns->msg_ctlmax;

			else if (tbl[i].data == &init_ipc_ns.msg_ctlmni)
				tbl[i].data = &ns->msg_ctlmni;

			else if (tbl[i].data == &init_ipc_ns.msg_ctlmnb)
				tbl[i].data = &ns->msg_ctlmnb;

			else if (tbl[i].data == &init_ipc_ns.sem_ctls)
				tbl[i].data = &ns->sem_ctls;
#ifdef CONFIG_CHECKPOINT_RESTORE
			else if (tbl[i].data == &init_ipc_ns.ids[IPC_SEM_IDS].next_id)
				tbl[i].data = &ns->ids[IPC_SEM_IDS].next_id;

			else if (tbl[i].data == &init_ipc_ns.ids[IPC_MSG_IDS].next_id)
				tbl[i].data = &ns->ids[IPC_MSG_IDS].next_id;

			else if (tbl[i].data == &init_ipc_ns.ids[IPC_SHM_IDS].next_id)
				tbl[i].data = &ns->ids[IPC_SHM_IDS].next_id;
#endif
			else
				tbl[i].data = NULL;
		}

		ns->ipc_sysctls = __register_sysctl_table(&ns->ipc_set,
							  "kernel", tbl,
							  ARRAY_SIZE(ipc_sysctls));
	}
	if (!ns->ipc_sysctls) {
		kfree(tbl);
		retire_sysctl_set(&ns->ipc_set);
		return false;
	}

	return true;
}

void retire_ipc_sysctls(struct ipc_namespace *ns)
{
	struct ctl_table *tbl;

	tbl = ns->ipc_sysctls->ctl_table_arg;
	unregister_sysctl_table(ns->ipc_sysctls);
	retire_sysctl_set(&ns->ipc_set);
	kfree(tbl);
}

static int __init ipc_sysctl_init(void)
{
	if (!setup_ipc_sysctls(&init_ipc_ns)) {
		pr_warn("ipc sysctl registration failed\n");
		return -ENOMEM;
	}
	return 0;
}

device_initcall(ipc_sysctl_init);

static int __init ipc_mni_extend(char *str)
{
	ipc_mni = IPCMNI_EXTEND;
	ipc_mni_shift = IPCMNI_EXTEND_SHIFT;
	ipc_min_cycle = IPCMNI_EXTEND_MIN_CYCLE;
	pr_info("IPCMNI extended to %d.\n", ipc_mni);
	return 0;
}
early_param("ipcmni_extend", ipc_mni_extend);
Commit	Line	Data
b886d83c	1	// SPDX-License-Identifier: GPL-2.0-only
a5494dcd EB	2	/*
	3	* Copyright (C) 2007
	4	*
	5	* Author: Eric Biederman <[email protected]>
a5494dcd EB	6	*/
	7
	8	#include <linux/module.h>
	9	#include <linux/ipc.h>
	10	#include <linux/nsproxy.h>
	11	#include <linux/sysctl.h>
	12	#include <linux/uaccess.h>
5563cabd	13	#include <linux/capability.h>
ae5e1b22	14	#include <linux/ipc_namespace.h>
6546bc42	15	#include <linux/msg.h>
1f5c135e	16	#include <linux/slab.h>
6546bc42	17	#include "util.h"
a5494dcd	18
1f5c135e	19	static int proc_ipc_dointvec_minmax_orphans(struct ctl_table *table, int write,
32927393	20	void buffer, size_t lenp, loff_t *ppos)
b34a6b1d	21	{
dd141a49 AG	22	struct ipc_namespace *ns =
dd141a49 AG	23	container_of(table->data, struct ipc_namespace, shm_rmid_forced);
1f5c135e	24	int err;
b34a6b1d	25
dd141a49	26	err = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
b34a6b1d VK	27
	28	if (err < 0)
	29	return err;
	30	if (ns->shm_rmid_forced)
	31	shm_destroy_orphaned(ns);
	32	return err;
	33	}
	34
0050ee05	35	static int proc_ipc_auto_msgmni(struct ctl_table *table, int write,
32927393	36	void buffer, size_t lenp, loff_t *ppos)
9eefe520 ND	37	{
9eefe520 ND	38	struct ctl_table ipc_table;
0050ee05	39	int dummy = 0;
9eefe520 ND	40
9eefe520 ND	41	memcpy(&ipc_table, table, sizeof(ipc_table));
0050ee05 MS	42	ipc_table.data = &dummy;
	43
	44	if (write)
	45	pr_info_once("writing to auto_msgmni has no effect");
	46
	47	return proc_dointvec_minmax(&ipc_table, write, buffer, lenp, ppos);
9eefe520 ND	48	}
9eefe520 ND	49
8c81ddd2	50	static int proc_ipc_sem_dointvec(struct ctl_table *table, int write,
fff1662c	51	void buffer, size_t lenp, loff_t *ppos)
8c81ddd2	52	{
dd141a49 AG	53	struct ipc_namespace *ns =
dd141a49 AG	54	container_of(table->data, struct ipc_namespace, sem_ctls);
8c81ddd2	55	int ret, semmni;
1f5c135e	56
8c81ddd2	57	semmni = ns->sem_ctls[3];
1f5c135e	58	ret = proc_dointvec(table, write, buffer, lenp, ppos);
8c81ddd2 WL	59
8c81ddd2 WL	60	if (!ret)
def7343f	61	ret = sem_check_semmni(ns);
8c81ddd2 WL	62
	63	/*
	64	* Reset the semmni value if an error happens.
	65	*/
	66	if (ret)
	67	ns->sem_ctls[3] = semmni;
	68	return ret;
	69	}
	70
5ac893b8 WL	71	int ipc_mni = IPCMNI;
5ac893b8 WL	72	int ipc_mni_shift = IPCMNI_SHIFT;
99db46ea	73	int ipc_min_cycle = RADIX_TREE_MAP_SIZE;
9eefe520	74
1f5c135e	75	static struct ctl_table ipc_sysctls[] = {
a5494dcd	76	{
a5494dcd EB	77	.procname = "shmmax",
a5494dcd EB	78	.data = &init_ipc_ns.shm_ctlmax,
239521f3	79	.maxlen = sizeof(init_ipc_ns.shm_ctlmax),
a5494dcd	80	.mode = 0644,
1f5c135e	81	.proc_handler = proc_doulongvec_minmax,
a5494dcd EB	82	},
a5494dcd EB	83	{
a5494dcd EB	84	.procname = "shmall",
a5494dcd EB	85	.data = &init_ipc_ns.shm_ctlall,
239521f3	86	.maxlen = sizeof(init_ipc_ns.shm_ctlall),
a5494dcd	87	.mode = 0644,
1f5c135e	88	.proc_handler = proc_doulongvec_minmax,
a5494dcd EB	89	},
a5494dcd EB	90	{
a5494dcd EB	91	.procname = "shmmni",
a5494dcd EB	92	.data = &init_ipc_ns.shm_ctlmni,
239521f3	93	.maxlen = sizeof(init_ipc_ns.shm_ctlmni),
a5494dcd	94	.mode = 0644,
1f5c135e	95	.proc_handler = proc_dointvec_minmax,
eec4844f	96	.extra1 = SYSCTL_ZERO,
6730e658	97	.extra2 = &ipc_mni,
a5494dcd	98	},
b34a6b1d VK	99	{
	100	.procname = "shm_rmid_forced",
	101	.data = &init_ipc_ns.shm_rmid_forced,
	102	.maxlen = sizeof(init_ipc_ns.shm_rmid_forced),
	103	.mode = 0644,
	104	.proc_handler = proc_ipc_dointvec_minmax_orphans,
dd141a49 AG	105	.extra1 = SYSCTL_ZERO,
dd141a49 AG	106	.extra2 = SYSCTL_ONE,
b34a6b1d	107	},
a5494dcd	108	{
a5494dcd EB	109	.procname = "msgmax",
a5494dcd EB	110	.data = &init_ipc_ns.msg_ctlmax,
239521f3	111	.maxlen = sizeof(init_ipc_ns.msg_ctlmax),
a5494dcd	112	.mode = 0644,
1f5c135e	113	.proc_handler = proc_dointvec_minmax,
eec4844f MC	114	.extra1 = SYSCTL_ZERO,
eec4844f MC	115	.extra2 = SYSCTL_INT_MAX,
a5494dcd EB	116	},
a5494dcd EB	117	{
a5494dcd EB	118	.procname = "msgmni",
a5494dcd EB	119	.data = &init_ipc_ns.msg_ctlmni,
239521f3	120	.maxlen = sizeof(init_ipc_ns.msg_ctlmni),
a5494dcd	121	.mode = 0644,
1f5c135e	122	.proc_handler = proc_dointvec_minmax,
eec4844f	123	.extra1 = SYSCTL_ZERO,
6730e658	124	.extra2 = &ipc_mni,
a5494dcd	125	},
0050ee05 MS	126	{
	127	.procname = "auto_msgmni",
	128	.data = NULL,
	129	.maxlen = sizeof(int),
	130	.mode = 0644,
	131	.proc_handler = proc_ipc_auto_msgmni,
eec4844f MC	132	.extra1 = SYSCTL_ZERO,
eec4844f MC	133	.extra2 = SYSCTL_ONE,
0050ee05	134	},
a5494dcd	135	{
a5494dcd EB	136	.procname = "msgmnb",
a5494dcd EB	137	.data = &init_ipc_ns.msg_ctlmnb,
239521f3	138	.maxlen = sizeof(init_ipc_ns.msg_ctlmnb),
a5494dcd	139	.mode = 0644,
1f5c135e	140	.proc_handler = proc_dointvec_minmax,
eec4844f MC	141	.extra1 = SYSCTL_ZERO,
eec4844f MC	142	.extra2 = SYSCTL_INT_MAX,
a5494dcd EB	143	},
a5494dcd EB	144	{
a5494dcd EB	145	.procname = "sem",
a5494dcd EB	146	.data = &init_ipc_ns.sem_ctls,
239521f3	147	.maxlen = 4*sizeof(int),
a5494dcd	148	.mode = 0644,
8c81ddd2	149	.proc_handler = proc_ipc_sem_dointvec,
a5494dcd	150	},
03f59566 SK	151	#ifdef CONFIG_CHECKPOINT_RESTORE
	152	{
	153	.procname = "sem_next_id",
	154	.data = &init_ipc_ns.ids[IPC_SEM_IDS].next_id,
	155	.maxlen = sizeof(init_ipc_ns.ids[IPC_SEM_IDS].next_id),
0889f44e AG	156	.mode = 0444,
	157	.proc_handler = proc_dointvec_minmax,
	158	.extra1 = SYSCTL_ZERO,
	159	.extra2 = SYSCTL_INT_MAX,
03f59566 SK	160	},
	161	{
	162	.procname = "msg_next_id",
	163	.data = &init_ipc_ns.ids[IPC_MSG_IDS].next_id,
	164	.maxlen = sizeof(init_ipc_ns.ids[IPC_MSG_IDS].next_id),
0889f44e AG	165	.mode = 0444,
	166	.proc_handler = proc_dointvec_minmax,
	167	.extra1 = SYSCTL_ZERO,
	168	.extra2 = SYSCTL_INT_MAX,
03f59566 SK	169	},
	170	{
	171	.procname = "shm_next_id",
	172	.data = &init_ipc_ns.ids[IPC_SHM_IDS].next_id,
	173	.maxlen = sizeof(init_ipc_ns.ids[IPC_SHM_IDS].next_id),
0889f44e AG	174	.mode = 0444,
	175	.proc_handler = proc_dointvec_minmax,
	176	.extra1 = SYSCTL_ZERO,
	177	.extra2 = SYSCTL_INT_MAX,
03f59566 SK	178	},
03f59566 SK	179	#endif
a5494dcd EB	180	{}
	181	};
	182
1f5c135e AG	183	static struct ctl_table_set set_lookup(struct ctl_table_root root)
	184	{
	185	return &current->nsproxy->ipc_ns->ipc_set;
	186	}
	187
	188	static int set_is_seen(struct ctl_table_set *set)
	189	{
	190	return &current->nsproxy->ipc_ns->ipc_set == set;
	191	}
	192
0889f44e AG	193	static int ipc_permissions(struct ctl_table_header head, struct ctl_table table)
	194	{
	195	int mode = table->mode;
	196
	197	#ifdef CONFIG_CHECKPOINT_RESTORE
	198	struct ipc_namespace *ns = current->nsproxy->ipc_ns;
	199
	200	if (((table->data == &ns->ids[IPC_SEM_IDS].next_id) \|\|
	201	(table->data == &ns->ids[IPC_MSG_IDS].next_id) \|\|
	202	(table->data == &ns->ids[IPC_SHM_IDS].next_id)) &&
	203	checkpoint_restore_ns_capable(ns->user_ns))
	204	mode = 0666;
	205	#endif
	206	return mode;
	207	}
	208
1f5c135e AG	209	static struct ctl_table_root set_root = {
1f5c135e AG	210	.lookup = set_lookup,
0889f44e	211	.permissions = ipc_permissions,
a5494dcd EB	212	};
a5494dcd EB	213
1f5c135e AG	214	bool setup_ipc_sysctls(struct ipc_namespace *ns)
	215	{
	216	struct ctl_table *tbl;
	217
	218	setup_sysctl_set(&ns->ipc_set, &set_root, set_is_seen);
	219
	220	tbl = kmemdup(ipc_sysctls, sizeof(ipc_sysctls), GFP_KERNEL);
	221	if (tbl) {
	222	int i;
	223
	224	for (i = 0; i < ARRAY_SIZE(ipc_sysctls); i++) {
38cd5b12	225	if (tbl[i].data == &init_ipc_ns.shm_ctlmax)
1f5c135e AG	226	tbl[i].data = &ns->shm_ctlmax;
1f5c135e AG	227
38cd5b12	228	else if (tbl[i].data == &init_ipc_ns.shm_ctlall)
1f5c135e AG	229	tbl[i].data = &ns->shm_ctlall;
1f5c135e AG	230
38cd5b12	231	else if (tbl[i].data == &init_ipc_ns.shm_ctlmni)
1f5c135e AG	232	tbl[i].data = &ns->shm_ctlmni;
1f5c135e AG	233
38cd5b12	234	else if (tbl[i].data == &init_ipc_ns.shm_rmid_forced)
1f5c135e	235	tbl[i].data = &ns->shm_rmid_forced;
1f5c135e	236
38cd5b12	237	else if (tbl[i].data == &init_ipc_ns.msg_ctlmax)
1f5c135e AG	238	tbl[i].data = &ns->msg_ctlmax;
1f5c135e AG	239
38cd5b12	240	else if (tbl[i].data == &init_ipc_ns.msg_ctlmni)
1f5c135e AG	241	tbl[i].data = &ns->msg_ctlmni;
1f5c135e AG	242
38cd5b12	243	else if (tbl[i].data == &init_ipc_ns.msg_ctlmnb)
1f5c135e AG	244	tbl[i].data = &ns->msg_ctlmnb;
1f5c135e AG	245
38cd5b12	246	else if (tbl[i].data == &init_ipc_ns.sem_ctls)
1f5c135e	247	tbl[i].data = &ns->sem_ctls;
1f5c135e	248	#ifdef CONFIG_CHECKPOINT_RESTORE
38cd5b12	249	else if (tbl[i].data == &init_ipc_ns.ids[IPC_SEM_IDS].next_id)
1f5c135e	250	tbl[i].data = &ns->ids[IPC_SEM_IDS].next_id;
1f5c135e	251
38cd5b12	252	else if (tbl[i].data == &init_ipc_ns.ids[IPC_MSG_IDS].next_id)
1f5c135e	253	tbl[i].data = &ns->ids[IPC_MSG_IDS].next_id;
1f5c135e	254
38cd5b12	255	else if (tbl[i].data == &init_ipc_ns.ids[IPC_SHM_IDS].next_id)
1f5c135e	256	tbl[i].data = &ns->ids[IPC_SHM_IDS].next_id;
1f5c135e	257	#endif
38cd5b12	258	else
1f5c135e	259	tbl[i].data = NULL;
1f5c135e AG	260	}
1f5c135e AG	261
bff97cf1 JG	262	ns->ipc_sysctls = __register_sysctl_table(&ns->ipc_set,
	263	"kernel", tbl,
	264	ARRAY_SIZE(ipc_sysctls));
1f5c135e AG	265	}
	266	if (!ns->ipc_sysctls) {
	267	kfree(tbl);
	268	retire_sysctl_set(&ns->ipc_set);
	269	return false;
	270	}
	271
	272	return true;
	273	}
	274
	275	void retire_ipc_sysctls(struct ipc_namespace *ns)
	276	{
	277	struct ctl_table *tbl;
	278
	279	tbl = ns->ipc_sysctls->ctl_table_arg;
	280	unregister_sysctl_table(ns->ipc_sysctls);
	281	retire_sysctl_set(&ns->ipc_set);
	282	kfree(tbl);
	283	}
	284
a5494dcd EB	285	static int __init ipc_sysctl_init(void)
a5494dcd EB	286	{
1f5c135e AG	287	if (!setup_ipc_sysctls(&init_ipc_ns)) {
	288	pr_warn("ipc sysctl registration failed\n");
	289	return -ENOMEM;
	290	}
a5494dcd EB	291	return 0;
	292	}
	293
6d08a256	294	device_initcall(ipc_sysctl_init);
5ac893b8 WL	295
	296	static int __init ipc_mni_extend(char *str)
	297	{
	298	ipc_mni = IPCMNI_EXTEND;
	299	ipc_mni_shift = IPCMNI_EXTEND_SHIFT;
99db46ea	300	ipc_min_cycle = IPCMNI_EXTEND_MIN_CYCLE;
5ac893b8 WL	301	pr_info("IPCMNI extended to %d.\n", ipc_mni);
	302	return 0;
	303	}
	304	early_param("ipcmni_extend", ipc_mni_extend);