blob: fbf6a8b93a2651f9ae7d1c13288e01f4cfe9abae [file] [log] [blame]
Thomas Gleixnerb886d83c2019-06-01 10:08:55 +02001// SPDX-License-Identifier: GPL-2.0-only
Serge E. Hallynbdc8e5f2009-04-06 19:01:11 -07002/*
3 * Copyright (C) 2007 IBM Corporation
4 *
5 * Author: Cedric Le Goater <clg@fr.ibm.com>
Serge E. Hallynbdc8e5f2009-04-06 19:01:11 -07006 */
7
8#include <linux/nsproxy.h>
9#include <linux/ipc_namespace.h>
10#include <linux/sysctl.h>
11
Alexey Gladkovdc55e352022-02-14 19:18:14 +010012#include <linux/stat.h>
13#include <linux/capability.h>
14#include <linux/slab.h>
Serge E. Hallynbdc8e5f2009-04-06 19:01:11 -070015
16static int msg_max_limit_min = MIN_MSGMAX;
Doug Ledford93e6f112012-05-31 16:26:28 -070017static int msg_max_limit_max = HARD_MSGMAX;
Serge E. Hallynbdc8e5f2009-04-06 19:01:11 -070018
19static int msg_maxsize_limit_min = MIN_MSGSIZEMAX;
Doug Ledford93e6f112012-05-31 16:26:28 -070020static int msg_maxsize_limit_max = HARD_MSGSIZEMAX;
Serge E. Hallynbdc8e5f2009-04-06 19:01:11 -070021
Joe Perchesa5c59282014-06-06 14:38:07 -070022static struct ctl_table mq_sysctls[] = {
Serge E. Hallynbdc8e5f2009-04-06 19:01:11 -070023 {
24 .procname = "queues_max",
25 .data = &init_ipc_ns.mq_queues_max,
26 .maxlen = sizeof(int),
27 .mode = 0644,
Alexey Gladkovdc55e352022-02-14 19:18:14 +010028 .proc_handler = proc_dointvec,
Serge E. Hallynbdc8e5f2009-04-06 19:01:11 -070029 },
30 {
31 .procname = "msg_max",
32 .data = &init_ipc_ns.mq_msg_max,
33 .maxlen = sizeof(int),
34 .mode = 0644,
Alexey Gladkovdc55e352022-02-14 19:18:14 +010035 .proc_handler = proc_dointvec_minmax,
Serge E. Hallynbdc8e5f2009-04-06 19:01:11 -070036 .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,
Alexey Gladkovdc55e352022-02-14 19:18:14 +010044 .proc_handler = proc_dointvec_minmax,
Serge E. Hallynbdc8e5f2009-04-06 19:01:11 -070045 .extra1 = &msg_maxsize_limit_min,
46 .extra2 = &msg_maxsize_limit_max,
47 },
KOSAKI Motohirocef01842012-05-31 16:26:33 -070048 {
49 .procname = "msg_default",
50 .data = &init_ipc_ns.mq_msg_default,
51 .maxlen = sizeof(int),
52 .mode = 0644,
Alexey Gladkovdc55e352022-02-14 19:18:14 +010053 .proc_handler = proc_dointvec_minmax,
KOSAKI Motohirocef01842012-05-31 16:26:33 -070054 .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,
Alexey Gladkovdc55e352022-02-14 19:18:14 +010062 .proc_handler = proc_dointvec_minmax,
KOSAKI Motohirocef01842012-05-31 16:26:33 -070063 .extra1 = &msg_maxsize_limit_min,
64 .extra2 = &msg_maxsize_limit_max,
65 },
Eric W. Biederman2bc46572009-04-03 02:51:10 -070066 {}
Serge E. Hallynbdc8e5f2009-04-06 19:01:11 -070067};
68
Alexey Gladkovdc55e352022-02-14 19:18:14 +010069static struct ctl_table_set *set_lookup(struct ctl_table_root *root)
Serge E. Hallynbdc8e5f2009-04-06 19:01:11 -070070{
Alexey Gladkovdc55e352022-02-14 19:18:14 +010071 return &current->nsproxy->ipc_ns->mq_set;
72}
73
74static int set_is_seen(struct ctl_table_set *set)
75{
76 return &current->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, "fs/mqueue", tbl);
113 }
114 if (!ns->mq_sysctls) {
115 kfree(tbl);
116 retire_sysctl_set(&ns->mq_set);
117 return false;
118 }
119
120 return true;
121}
122
123void retire_mq_sysctls(struct ipc_namespace *ns)
124{
125 struct ctl_table *tbl;
126
127 tbl = ns->mq_sysctls->ctl_table_arg;
128 unregister_sysctl_table(ns->mq_sysctls);
129 retire_sysctl_set(&ns->mq_set);
130 kfree(tbl);
Serge E. Hallynbdc8e5f2009-04-06 19:01:11 -0700131}