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Eric W. Biedermana5494dc2007-02-14 00:34:06 -08001/*
2 * Copyright (C) 2007
3 *
4 * Author: Eric Biederman <ebiederm@xmision.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/module.h>
13#include <linux/ipc.h>
14#include <linux/nsproxy.h>
15#include <linux/sysctl.h>
16#include <linux/uaccess.h>
Pavel Emelyanovae5e1b22008-02-08 04:18:22 -080017#include <linux/ipc_namespace.h>
Nadia Derbey6546bc42008-04-29 01:00:45 -070018#include <linux/msg.h>
19#include "util.h"
Eric W. Biedermana5494dc2007-02-14 00:34:06 -080020
Joe Perchesa5c59282014-06-06 14:38:07 -070021static void *get_ipc(struct ctl_table *table)
Eric W. Biedermana5494dc2007-02-14 00:34:06 -080022{
23 char *which = table->data;
24 struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns;
25 which = (which - (char *)&init_ipc_ns) + (char *)ipc_ns;
26 return which;
27}
Eric W. Biedermana5494dc2007-02-14 00:34:06 -080028
Serge E. Hallyn11dea192009-04-02 16:58:27 -070029#ifdef CONFIG_PROC_SYSCTL
Joe Perchesa5c59282014-06-06 14:38:07 -070030static int proc_ipc_dointvec(struct ctl_table *table, int write,
Eric W. Biedermana5494dc2007-02-14 00:34:06 -080031 void __user *buffer, size_t *lenp, loff_t *ppos)
32{
33 struct ctl_table ipc_table;
Vasiliy Kulikovb34a6b12011-07-26 16:08:48 -070034
Eric W. Biedermana5494dc2007-02-14 00:34:06 -080035 memcpy(&ipc_table, table, sizeof(ipc_table));
36 ipc_table.data = get_ipc(table);
37
Alexey Dobriyan8d65af72009-09-23 15:57:19 -070038 return proc_dointvec(&ipc_table, write, buffer, lenp, ppos);
Eric W. Biedermana5494dc2007-02-14 00:34:06 -080039}
40
Joe Perchesa5c59282014-06-06 14:38:07 -070041static int proc_ipc_dointvec_minmax(struct ctl_table *table, int write,
Vasiliy Kulikovb34a6b12011-07-26 16:08:48 -070042 void __user *buffer, size_t *lenp, loff_t *ppos)
43{
44 struct ctl_table ipc_table;
45
46 memcpy(&ipc_table, table, sizeof(ipc_table));
47 ipc_table.data = get_ipc(table);
48
49 return proc_dointvec_minmax(&ipc_table, write, buffer, lenp, ppos);
50}
51
Joe Perchesa5c59282014-06-06 14:38:07 -070052static int proc_ipc_dointvec_minmax_orphans(struct ctl_table *table, int write,
Vasiliy Kulikovb34a6b12011-07-26 16:08:48 -070053 void __user *buffer, size_t *lenp, loff_t *ppos)
54{
55 struct ipc_namespace *ns = current->nsproxy->ipc_ns;
56 int err = proc_ipc_dointvec_minmax(table, write, buffer, lenp, ppos);
57
58 if (err < 0)
59 return err;
60 if (ns->shm_rmid_forced)
61 shm_destroy_orphaned(ns);
62 return err;
63}
64
Joe Perchesa5c59282014-06-06 14:38:07 -070065static int proc_ipc_callback_dointvec_minmax(struct ctl_table *table, int write,
Alexey Dobriyan8d65af72009-09-23 15:57:19 -070066 void __user *buffer, size_t *lenp, loff_t *ppos)
Nadia Derbey91cfb2b2008-04-29 01:00:44 -070067{
Nadia Derbey6546bc42008-04-29 01:00:45 -070068 struct ctl_table ipc_table;
Nadia Derbey91cfb2b2008-04-29 01:00:44 -070069 size_t lenp_bef = *lenp;
70 int rc;
71
Nadia Derbey6546bc42008-04-29 01:00:45 -070072 memcpy(&ipc_table, table, sizeof(ipc_table));
73 ipc_table.data = get_ipc(table);
74
Mathias Krause9bf76ca2013-11-03 12:36:28 +010075 rc = proc_dointvec_minmax(&ipc_table, write, buffer, lenp, ppos);
Nadia Derbey91cfb2b2008-04-29 01:00:44 -070076
77 if (write && !rc && lenp_bef == *lenp)
Nadia Derbey9eefe522008-07-25 01:48:08 -070078 /*
79 * Tunable has successfully been changed by hand. Disable its
80 * automatic adjustment. This simply requires unregistering
81 * the notifiers that trigger recalculation.
82 */
83 unregister_ipcns_notifier(current->nsproxy->ipc_ns);
Nadia Derbey91cfb2b2008-04-29 01:00:44 -070084
85 return rc;
86}
87
Joe Perchesa5c59282014-06-06 14:38:07 -070088static int proc_ipc_doulongvec_minmax(struct ctl_table *table, int write,
Alexey Dobriyan8d65af72009-09-23 15:57:19 -070089 void __user *buffer, size_t *lenp, loff_t *ppos)
Eric W. Biedermana5494dc2007-02-14 00:34:06 -080090{
91 struct ctl_table ipc_table;
92 memcpy(&ipc_table, table, sizeof(ipc_table));
93 ipc_table.data = get_ipc(table);
94
Alexey Dobriyan8d65af72009-09-23 15:57:19 -070095 return proc_doulongvec_minmax(&ipc_table, write, buffer,
Eric W. Biedermana5494dc2007-02-14 00:34:06 -080096 lenp, ppos);
97}
98
akpm@linux-foundation.org4c2c3b42009-01-06 14:42:51 -080099/*
100 * Routine that is called when the file "auto_msgmni" has successfully been
101 * written.
102 * Two values are allowed:
103 * 0: unregister msgmni's callback routine from the ipc namespace notifier
104 * chain. This means that msgmni won't be recomputed anymore upon memory
105 * add/remove or ipc namespace creation/removal.
106 * 1: register back the callback routine.
107 */
108static void ipc_auto_callback(int val)
109{
110 if (!val)
111 unregister_ipcns_notifier(current->nsproxy->ipc_ns);
112 else {
113 /*
114 * Re-enable automatic recomputing only if not already
115 * enabled.
116 */
117 recompute_msgmni(current->nsproxy->ipc_ns);
118 cond_register_ipcns_notifier(current->nsproxy->ipc_ns);
119 }
120}
121
Joe Perchesa5c59282014-06-06 14:38:07 -0700122static int proc_ipcauto_dointvec_minmax(struct ctl_table *table, int write,
Alexey Dobriyan8d65af72009-09-23 15:57:19 -0700123 void __user *buffer, size_t *lenp, loff_t *ppos)
Nadia Derbey9eefe522008-07-25 01:48:08 -0700124{
125 struct ctl_table ipc_table;
126 size_t lenp_bef = *lenp;
127 int oldval;
128 int rc;
129
130 memcpy(&ipc_table, table, sizeof(ipc_table));
131 ipc_table.data = get_ipc(table);
132 oldval = *((int *)(ipc_table.data));
133
Alexey Dobriyan8d65af72009-09-23 15:57:19 -0700134 rc = proc_dointvec_minmax(&ipc_table, write, buffer, lenp, ppos);
Nadia Derbey9eefe522008-07-25 01:48:08 -0700135
136 if (write && !rc && lenp_bef == *lenp) {
137 int newval = *((int *)(ipc_table.data));
138 /*
139 * The file "auto_msgmni" has correctly been set.
140 * React by (un)registering the corresponding tunable, if the
141 * value has changed.
142 */
143 if (newval != oldval)
144 ipc_auto_callback(newval);
145 }
146
147 return rc;
148}
149
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800150#else
151#define proc_ipc_doulongvec_minmax NULL
152#define proc_ipc_dointvec NULL
Vasiliy Kulikovb34a6b12011-07-26 16:08:48 -0700153#define proc_ipc_dointvec_minmax NULL
154#define proc_ipc_dointvec_minmax_orphans NULL
Mathias Krause9bf76ca2013-11-03 12:36:28 +0100155#define proc_ipc_callback_dointvec_minmax NULL
Nadia Derbey9eefe522008-07-25 01:48:08 -0700156#define proc_ipcauto_dointvec_minmax NULL
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800157#endif
158
Nadia Derbey9eefe522008-07-25 01:48:08 -0700159static int zero;
160static int one = 1;
Stanislav Kinsbursky03f59562013-01-04 15:34:50 -0800161static int int_max = INT_MAX;
Nadia Derbey9eefe522008-07-25 01:48:08 -0700162
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800163static struct ctl_table ipc_kern_table[] = {
164 {
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800165 .procname = "shmmax",
166 .data = &init_ipc_ns.shm_ctlmax,
Manfred Spraul239521f2014-01-27 17:07:04 -0800167 .maxlen = sizeof(init_ipc_ns.shm_ctlmax),
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800168 .mode = 0644,
169 .proc_handler = proc_ipc_doulongvec_minmax,
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800170 },
171 {
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800172 .procname = "shmall",
173 .data = &init_ipc_ns.shm_ctlall,
Manfred Spraul239521f2014-01-27 17:07:04 -0800174 .maxlen = sizeof(init_ipc_ns.shm_ctlall),
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800175 .mode = 0644,
176 .proc_handler = proc_ipc_doulongvec_minmax,
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800177 },
178 {
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800179 .procname = "shmmni",
180 .data = &init_ipc_ns.shm_ctlmni,
Manfred Spraul239521f2014-01-27 17:07:04 -0800181 .maxlen = sizeof(init_ipc_ns.shm_ctlmni),
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800182 .mode = 0644,
183 .proc_handler = proc_ipc_dointvec,
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800184 },
185 {
Vasiliy Kulikovb34a6b12011-07-26 16:08:48 -0700186 .procname = "shm_rmid_forced",
187 .data = &init_ipc_ns.shm_rmid_forced,
188 .maxlen = sizeof(init_ipc_ns.shm_rmid_forced),
189 .mode = 0644,
190 .proc_handler = proc_ipc_dointvec_minmax_orphans,
191 .extra1 = &zero,
192 .extra2 = &one,
193 },
194 {
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800195 .procname = "msgmax",
196 .data = &init_ipc_ns.msg_ctlmax,
Manfred Spraul239521f2014-01-27 17:07:04 -0800197 .maxlen = sizeof(init_ipc_ns.msg_ctlmax),
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800198 .mode = 0644,
Mathias Krause9bf76ca2013-11-03 12:36:28 +0100199 .proc_handler = proc_ipc_dointvec_minmax,
200 .extra1 = &zero,
201 .extra2 = &int_max,
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800202 },
203 {
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800204 .procname = "msgmni",
205 .data = &init_ipc_ns.msg_ctlmni,
Manfred Spraul239521f2014-01-27 17:07:04 -0800206 .maxlen = sizeof(init_ipc_ns.msg_ctlmni),
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800207 .mode = 0644,
Mathias Krause9bf76ca2013-11-03 12:36:28 +0100208 .proc_handler = proc_ipc_callback_dointvec_minmax,
209 .extra1 = &zero,
210 .extra2 = &int_max,
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800211 },
212 {
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800213 .procname = "msgmnb",
214 .data = &init_ipc_ns.msg_ctlmnb,
Manfred Spraul239521f2014-01-27 17:07:04 -0800215 .maxlen = sizeof(init_ipc_ns.msg_ctlmnb),
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800216 .mode = 0644,
Mathias Krause9bf76ca2013-11-03 12:36:28 +0100217 .proc_handler = proc_ipc_dointvec_minmax,
218 .extra1 = &zero,
219 .extra2 = &int_max,
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800220 },
221 {
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800222 .procname = "sem",
223 .data = &init_ipc_ns.sem_ctls,
Manfred Spraul239521f2014-01-27 17:07:04 -0800224 .maxlen = 4*sizeof(int),
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800225 .mode = 0644,
226 .proc_handler = proc_ipc_dointvec,
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800227 },
Nadia Derbey9eefe522008-07-25 01:48:08 -0700228 {
Nadia Derbey9eefe522008-07-25 01:48:08 -0700229 .procname = "auto_msgmni",
230 .data = &init_ipc_ns.auto_msgmni,
231 .maxlen = sizeof(int),
232 .mode = 0644,
233 .proc_handler = proc_ipcauto_dointvec_minmax,
234 .extra1 = &zero,
235 .extra2 = &one,
236 },
Stanislav Kinsbursky03f59562013-01-04 15:34:50 -0800237#ifdef CONFIG_CHECKPOINT_RESTORE
238 {
239 .procname = "sem_next_id",
240 .data = &init_ipc_ns.ids[IPC_SEM_IDS].next_id,
241 .maxlen = sizeof(init_ipc_ns.ids[IPC_SEM_IDS].next_id),
242 .mode = 0644,
243 .proc_handler = proc_ipc_dointvec_minmax,
244 .extra1 = &zero,
245 .extra2 = &int_max,
246 },
247 {
248 .procname = "msg_next_id",
249 .data = &init_ipc_ns.ids[IPC_MSG_IDS].next_id,
250 .maxlen = sizeof(init_ipc_ns.ids[IPC_MSG_IDS].next_id),
251 .mode = 0644,
252 .proc_handler = proc_ipc_dointvec_minmax,
253 .extra1 = &zero,
254 .extra2 = &int_max,
255 },
256 {
257 .procname = "shm_next_id",
258 .data = &init_ipc_ns.ids[IPC_SHM_IDS].next_id,
259 .maxlen = sizeof(init_ipc_ns.ids[IPC_SHM_IDS].next_id),
260 .mode = 0644,
261 .proc_handler = proc_ipc_dointvec_minmax,
262 .extra1 = &zero,
263 .extra2 = &int_max,
264 },
265#endif
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800266 {}
267};
268
269static struct ctl_table ipc_root_table[] = {
270 {
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800271 .procname = "kernel",
272 .mode = 0555,
273 .child = ipc_kern_table,
274 },
275 {}
276};
277
278static int __init ipc_sysctl_init(void)
279{
Eric W. Biederman0b4d4142007-02-14 00:34:09 -0800280 register_sysctl_table(ipc_root_table);
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800281 return 0;
282}
283
Davidlohr Bueso6d08a252014-04-07 15:39:18 -0700284device_initcall(ipc_sysctl_init);