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 | |
16 | static int msg_max_limit_min = MIN_MSGMAX; |
17 | static int msg_max_limit_max = HARD_MSGMAX; |
18 | |
19 | static int msg_maxsize_limit_min = MIN_MSGSIZEMAX; |
20 | static int msg_maxsize_limit_max = HARD_MSGSIZEMAX; |
21 | |
22 | static 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 | |
69 | static struct ctl_table_set *set_lookup(struct ctl_table_root *root) |
70 | { |
71 | return ¤t->nsproxy->ipc_ns->mq_set; |
72 | } |
73 | |
74 | static int set_is_seen(struct ctl_table_set *set) |
75 | { |
76 | return ¤t->nsproxy->ipc_ns->mq_set == set; |
77 | } |
78 | |
79 | static struct ctl_table_root set_root = { |
80 | .lookup = set_lookup, |
81 | }; |
82 | |
83 | bool setup_mq_sysctls(struct ipc_namespace *ns) |
84 | { |
85 | struct ctl_table *tbl; |
86 | |
87 | setup_sysctl_set(p: &ns->mq_set, root: &set_root, is_seen: set_is_seen); |
88 | |
89 | tbl = kmemdup(p: mq_sysctls, size: 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(set: &ns->mq_set, |
113 | path: "fs/mqueue" , table: tbl, |
114 | ARRAY_SIZE(mq_sysctls)); |
115 | } |
116 | if (!ns->mq_sysctls) { |
117 | kfree(objp: tbl); |
118 | retire_sysctl_set(set: &ns->mq_set); |
119 | return false; |
120 | } |
121 | |
122 | return true; |
123 | } |
124 | |
125 | void 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(table: ns->mq_sysctls); |
131 | retire_sysctl_set(set: &ns->mq_set); |
132 | kfree(objp: tbl); |
133 | } |
134 | |