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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2007 IBM Corporation
4 *
5 * Author: Cedric Le Goater <clg@fr.ibm.com>
6 */
7
8#include <linux/nsproxy.h>
9#include <linux/ipc_namespace.h>
10#include <linux/sysctl.h>
11
12#include <linux/stat.h>
13#include <linux/capability.h>
14#include <linux/slab.h>
15
16static int msg_max_limit_min = MIN_MSGMAX;
17static int msg_max_limit_max = HARD_MSGMAX;
18
19static int msg_maxsize_limit_min = MIN_MSGSIZEMAX;
20static int msg_maxsize_limit_max = HARD_MSGSIZEMAX;
21
22static struct ctl_table mq_sysctls[] = {
23 {
24 .procname = "queues_max",
25 .data = &init_ipc_ns.mq_queues_max,
26 .maxlen = sizeof(int),
27 .mode = 0644,
28 .proc_handler = proc_dointvec,
29 },
30 {
31 .procname = "msg_max",
32 .data = &init_ipc_ns.mq_msg_max,
33 .maxlen = sizeof(int),
34 .mode = 0644,
35 .proc_handler = proc_dointvec_minmax,
36 .extra1 = &msg_max_limit_min,
37 .extra2 = &msg_max_limit_max,
38 },
39 {
40 .procname = "msgsize_max",
41 .data = &init_ipc_ns.mq_msgsize_max,
42 .maxlen = sizeof(int),
43 .mode = 0644,
44 .proc_handler = proc_dointvec_minmax,
45 .extra1 = &msg_maxsize_limit_min,
46 .extra2 = &msg_maxsize_limit_max,
47 },
48 {
49 .procname = "msg_default",
50 .data = &init_ipc_ns.mq_msg_default,
51 .maxlen = sizeof(int),
52 .mode = 0644,
53 .proc_handler = proc_dointvec_minmax,
54 .extra1 = &msg_max_limit_min,
55 .extra2 = &msg_max_limit_max,
56 },
57 {
58 .procname = "msgsize_default",
59 .data = &init_ipc_ns.mq_msgsize_default,
60 .maxlen = sizeof(int),
61 .mode = 0644,
62 .proc_handler = proc_dointvec_minmax,
63 .extra1 = &msg_maxsize_limit_min,
64 .extra2 = &msg_maxsize_limit_max,
65 },
66 {}
67};
68
69static struct ctl_table_set *set_lookup(struct ctl_table_root *root)
70{
71 return ¤t->nsproxy->ipc_ns->mq_set;
72}
73
74static int set_is_seen(struct ctl_table_set *set)
75{
76 return ¤t->nsproxy->ipc_ns->mq_set == set;
77}
78
79static struct ctl_table_root set_root = {
80 .lookup = set_lookup,
81};
82
83bool setup_mq_sysctls(struct ipc_namespace *ns)
84{
85 struct ctl_table *tbl;
86
87 setup_sysctl_set(&ns->mq_set, &set_root, set_is_seen);
88
89 tbl = kmemdup(mq_sysctls, sizeof(mq_sysctls), GFP_KERNEL);
90 if (tbl) {
91 int i;
92
93 for (i = 0; i < ARRAY_SIZE(mq_sysctls); i++) {
94 if (tbl[i].data == &init_ipc_ns.mq_queues_max)
95 tbl[i].data = &ns->mq_queues_max;
96
97 else if (tbl[i].data == &init_ipc_ns.mq_msg_max)
98 tbl[i].data = &ns->mq_msg_max;
99
100 else if (tbl[i].data == &init_ipc_ns.mq_msgsize_max)
101 tbl[i].data = &ns->mq_msgsize_max;
102
103 else if (tbl[i].data == &init_ipc_ns.mq_msg_default)
104 tbl[i].data = &ns->mq_msg_default;
105
106 else if (tbl[i].data == &init_ipc_ns.mq_msgsize_default)
107 tbl[i].data = &ns->mq_msgsize_default;
108 else
109 tbl[i].data = NULL;
110 }
111
112 ns->mq_sysctls = __register_sysctl_table(&ns->mq_set,
113 "fs/mqueue", tbl,
114 ARRAY_SIZE(mq_sysctls));
115 }
116 if (!ns->mq_sysctls) {
117 kfree(tbl);
118 retire_sysctl_set(&ns->mq_set);
119 return false;
120 }
121
122 return true;
123}
124
125void retire_mq_sysctls(struct ipc_namespace *ns)
126{
127 struct ctl_table *tbl;
128
129 tbl = ns->mq_sysctls->ctl_table_arg;
130 unregister_sysctl_table(ns->mq_sysctls);
131 retire_sysctl_set(&ns->mq_set);
132 kfree(tbl);
133}
1/*
2 * Copyright (C) 2007 IBM Corporation
3 *
4 * Author: Cedric Le Goater <clg@fr.ibm.com>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation, version 2 of the
9 * License.
10 */
11
12#include <linux/nsproxy.h>
13#include <linux/ipc_namespace.h>
14#include <linux/sysctl.h>
15
16/*
17 * Define the ranges various user-specified maximum values can
18 * be set to.
19 */
20#define MIN_MSGMAX 1 /* min value for msg_max */
21#define MAX_MSGMAX HARD_MSGMAX /* max value for msg_max */
22#define MIN_MSGSIZEMAX 128 /* min value for msgsize_max */
23#define MAX_MSGSIZEMAX (8192*128) /* max value for msgsize_max */
24
25#ifdef CONFIG_PROC_SYSCTL
26static void *get_mq(ctl_table *table)
27{
28 char *which = table->data;
29 struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns;
30 which = (which - (char *)&init_ipc_ns) + (char *)ipc_ns;
31 return which;
32}
33
34static int proc_mq_dointvec(ctl_table *table, int write,
35 void __user *buffer, size_t *lenp, loff_t *ppos)
36{
37 struct ctl_table mq_table;
38 memcpy(&mq_table, table, sizeof(mq_table));
39 mq_table.data = get_mq(table);
40
41 return proc_dointvec(&mq_table, write, buffer, lenp, ppos);
42}
43
44static int proc_mq_dointvec_minmax(ctl_table *table, int write,
45 void __user *buffer, size_t *lenp, loff_t *ppos)
46{
47 struct ctl_table mq_table;
48 memcpy(&mq_table, table, sizeof(mq_table));
49 mq_table.data = get_mq(table);
50
51 return proc_dointvec_minmax(&mq_table, write, buffer,
52 lenp, ppos);
53}
54#else
55#define proc_mq_dointvec NULL
56#define proc_mq_dointvec_minmax NULL
57#endif
58
59static int msg_max_limit_min = MIN_MSGMAX;
60static int msg_max_limit_max = MAX_MSGMAX;
61
62static int msg_maxsize_limit_min = MIN_MSGSIZEMAX;
63static int msg_maxsize_limit_max = MAX_MSGSIZEMAX;
64
65static ctl_table mq_sysctls[] = {
66 {
67 .procname = "queues_max",
68 .data = &init_ipc_ns.mq_queues_max,
69 .maxlen = sizeof(int),
70 .mode = 0644,
71 .proc_handler = proc_mq_dointvec,
72 },
73 {
74 .procname = "msg_max",
75 .data = &init_ipc_ns.mq_msg_max,
76 .maxlen = sizeof(int),
77 .mode = 0644,
78 .proc_handler = proc_mq_dointvec_minmax,
79 .extra1 = &msg_max_limit_min,
80 .extra2 = &msg_max_limit_max,
81 },
82 {
83 .procname = "msgsize_max",
84 .data = &init_ipc_ns.mq_msgsize_max,
85 .maxlen = sizeof(int),
86 .mode = 0644,
87 .proc_handler = proc_mq_dointvec_minmax,
88 .extra1 = &msg_maxsize_limit_min,
89 .extra2 = &msg_maxsize_limit_max,
90 },
91 {}
92};
93
94static ctl_table mq_sysctl_dir[] = {
95 {
96 .procname = "mqueue",
97 .mode = 0555,
98 .child = mq_sysctls,
99 },
100 {}
101};
102
103static ctl_table mq_sysctl_root[] = {
104 {
105 .procname = "fs",
106 .mode = 0555,
107 .child = mq_sysctl_dir,
108 },
109 {}
110};
111
112struct ctl_table_header *mq_register_sysctl_table(void)
113{
114 return register_sysctl_table(mq_sysctl_root);
115}