Thomas Gleixner | b886d83c | 2019-06-01 10:08:55 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Serge E. Hallyn | bdc8e5f | 2009-04-06 19:01:11 -0700 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (C) 2007 IBM Corporation |
| 4 | * |
| 5 | * Author: Cedric Le Goater <clg@fr.ibm.com> |
Serge E. Hallyn | bdc8e5f | 2009-04-06 19:01:11 -0700 | [diff] [blame] | 6 | */ |
| 7 | |
| 8 | #include <linux/nsproxy.h> |
| 9 | #include <linux/ipc_namespace.h> |
| 10 | #include <linux/sysctl.h> |
| 11 | |
Alexey Gladkov | dc55e35 | 2022-02-14 19:18:14 +0100 | [diff] [blame] | 12 | #include <linux/stat.h> |
| 13 | #include <linux/capability.h> |
| 14 | #include <linux/slab.h> |
Serge E. Hallyn | bdc8e5f | 2009-04-06 19:01:11 -0700 | [diff] [blame] | 15 | |
| 16 | static int msg_max_limit_min = MIN_MSGMAX; |
Doug Ledford | 93e6f11 | 2012-05-31 16:26:28 -0700 | [diff] [blame] | 17 | static int msg_max_limit_max = HARD_MSGMAX; |
Serge E. Hallyn | bdc8e5f | 2009-04-06 19:01:11 -0700 | [diff] [blame] | 18 | |
| 19 | static int msg_maxsize_limit_min = MIN_MSGSIZEMAX; |
Doug Ledford | 93e6f11 | 2012-05-31 16:26:28 -0700 | [diff] [blame] | 20 | static int msg_maxsize_limit_max = HARD_MSGSIZEMAX; |
Serge E. Hallyn | bdc8e5f | 2009-04-06 19:01:11 -0700 | [diff] [blame] | 21 | |
Joe Perches | a5c5928 | 2014-06-06 14:38:07 -0700 | [diff] [blame] | 22 | static struct ctl_table mq_sysctls[] = { |
Serge E. Hallyn | bdc8e5f | 2009-04-06 19:01:11 -0700 | [diff] [blame] | 23 | { |
| 24 | .procname = "queues_max", |
| 25 | .data = &init_ipc_ns.mq_queues_max, |
| 26 | .maxlen = sizeof(int), |
| 27 | .mode = 0644, |
Alexey Gladkov | dc55e35 | 2022-02-14 19:18:14 +0100 | [diff] [blame] | 28 | .proc_handler = proc_dointvec, |
Serge E. Hallyn | bdc8e5f | 2009-04-06 19:01:11 -0700 | [diff] [blame] | 29 | }, |
| 30 | { |
| 31 | .procname = "msg_max", |
| 32 | .data = &init_ipc_ns.mq_msg_max, |
| 33 | .maxlen = sizeof(int), |
| 34 | .mode = 0644, |
Alexey Gladkov | dc55e35 | 2022-02-14 19:18:14 +0100 | [diff] [blame] | 35 | .proc_handler = proc_dointvec_minmax, |
Serge E. Hallyn | bdc8e5f | 2009-04-06 19:01:11 -0700 | [diff] [blame] | 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, |
Alexey Gladkov | dc55e35 | 2022-02-14 19:18:14 +0100 | [diff] [blame] | 44 | .proc_handler = proc_dointvec_minmax, |
Serge E. Hallyn | bdc8e5f | 2009-04-06 19:01:11 -0700 | [diff] [blame] | 45 | .extra1 = &msg_maxsize_limit_min, |
| 46 | .extra2 = &msg_maxsize_limit_max, |
| 47 | }, |
KOSAKI Motohiro | cef0184 | 2012-05-31 16:26:33 -0700 | [diff] [blame] | 48 | { |
| 49 | .procname = "msg_default", |
| 50 | .data = &init_ipc_ns.mq_msg_default, |
| 51 | .maxlen = sizeof(int), |
| 52 | .mode = 0644, |
Alexey Gladkov | dc55e35 | 2022-02-14 19:18:14 +0100 | [diff] [blame] | 53 | .proc_handler = proc_dointvec_minmax, |
KOSAKI Motohiro | cef0184 | 2012-05-31 16:26:33 -0700 | [diff] [blame] | 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, |
Alexey Gladkov | dc55e35 | 2022-02-14 19:18:14 +0100 | [diff] [blame] | 62 | .proc_handler = proc_dointvec_minmax, |
KOSAKI Motohiro | cef0184 | 2012-05-31 16:26:33 -0700 | [diff] [blame] | 63 | .extra1 = &msg_maxsize_limit_min, |
| 64 | .extra2 = &msg_maxsize_limit_max, |
| 65 | }, |
Eric W. Biederman | 2bc4657 | 2009-04-03 02:51:10 -0700 | [diff] [blame] | 66 | {} |
Serge E. Hallyn | bdc8e5f | 2009-04-06 19:01:11 -0700 | [diff] [blame] | 67 | }; |
| 68 | |
Alexey Gladkov | dc55e35 | 2022-02-14 19:18:14 +0100 | [diff] [blame] | 69 | static struct ctl_table_set *set_lookup(struct ctl_table_root *root) |
Serge E. Hallyn | bdc8e5f | 2009-04-06 19:01:11 -0700 | [diff] [blame] | 70 | { |
Alexey Gladkov | dc55e35 | 2022-02-14 19:18:14 +0100 | [diff] [blame] | 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(&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 | |
| 123 | void 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. Hallyn | bdc8e5f | 2009-04-06 19:01:11 -0700 | [diff] [blame] | 131 | } |