Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus
[deliverable/linux.git] / ipc / ipc_sysctl.c
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1/*
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>
ae5e1b22 17#include <linux/ipc_namespace.h>
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18#include <linux/msg.h>
19#include "util.h"
a5494dcd 20
a5c5928b 21static void *get_ipc(struct ctl_table *table)
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22{
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}
a5494dcd 28
11dea190 29#ifdef CONFIG_PROC_SYSCTL
a5c5928b 30static int proc_ipc_dointvec(struct ctl_table *table, int write,
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31 void __user *buffer, size_t *lenp, loff_t *ppos)
32{
33 struct ctl_table ipc_table;
b34a6b1d 34
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35 memcpy(&ipc_table, table, sizeof(ipc_table));
36 ipc_table.data = get_ipc(table);
37
8d65af78 38 return proc_dointvec(&ipc_table, write, buffer, lenp, ppos);
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39}
40
a5c5928b 41static int proc_ipc_dointvec_minmax(struct ctl_table *table, int write,
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42 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
a5c5928b 52static int proc_ipc_dointvec_minmax_orphans(struct ctl_table *table, int write,
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53 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
a5c5928b 65static int proc_ipc_doulongvec_minmax(struct ctl_table *table, int write,
8d65af78 66 void __user *buffer, size_t *lenp, loff_t *ppos)
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67{
68 struct ctl_table ipc_table;
69 memcpy(&ipc_table, table, sizeof(ipc_table));
70 ipc_table.data = get_ipc(table);
71
8d65af78 72 return proc_doulongvec_minmax(&ipc_table, write, buffer,
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73 lenp, ppos);
74}
75
0050ee05 76static int proc_ipc_auto_msgmni(struct ctl_table *table, int write,
8d65af78 77 void __user *buffer, size_t *lenp, loff_t *ppos)
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78{
79 struct ctl_table ipc_table;
0050ee05 80 int dummy = 0;
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81
82 memcpy(&ipc_table, table, sizeof(ipc_table));
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83 ipc_table.data = &dummy;
84
85 if (write)
86 pr_info_once("writing to auto_msgmni has no effect");
87
88 return proc_dointvec_minmax(&ipc_table, write, buffer, lenp, ppos);
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89}
90
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91#else
92#define proc_ipc_doulongvec_minmax NULL
93#define proc_ipc_dointvec NULL
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94#define proc_ipc_dointvec_minmax NULL
95#define proc_ipc_dointvec_minmax_orphans NULL
0050ee05 96#define proc_ipc_auto_msgmni NULL
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97#endif
98
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99static int zero;
100static int one = 1;
03f59566 101static int int_max = INT_MAX;
9eefe520 102
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103static struct ctl_table ipc_kern_table[] = {
104 {
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105 .procname = "shmmax",
106 .data = &init_ipc_ns.shm_ctlmax,
239521f3 107 .maxlen = sizeof(init_ipc_ns.shm_ctlmax),
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108 .mode = 0644,
109 .proc_handler = proc_ipc_doulongvec_minmax,
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110 },
111 {
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112 .procname = "shmall",
113 .data = &init_ipc_ns.shm_ctlall,
239521f3 114 .maxlen = sizeof(init_ipc_ns.shm_ctlall),
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115 .mode = 0644,
116 .proc_handler = proc_ipc_doulongvec_minmax,
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117 },
118 {
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119 .procname = "shmmni",
120 .data = &init_ipc_ns.shm_ctlmni,
239521f3 121 .maxlen = sizeof(init_ipc_ns.shm_ctlmni),
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122 .mode = 0644,
123 .proc_handler = proc_ipc_dointvec,
a5494dcd 124 },
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125 {
126 .procname = "shm_rmid_forced",
127 .data = &init_ipc_ns.shm_rmid_forced,
128 .maxlen = sizeof(init_ipc_ns.shm_rmid_forced),
129 .mode = 0644,
130 .proc_handler = proc_ipc_dointvec_minmax_orphans,
131 .extra1 = &zero,
132 .extra2 = &one,
133 },
a5494dcd 134 {
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135 .procname = "msgmax",
136 .data = &init_ipc_ns.msg_ctlmax,
239521f3 137 .maxlen = sizeof(init_ipc_ns.msg_ctlmax),
a5494dcd 138 .mode = 0644,
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139 .proc_handler = proc_ipc_dointvec_minmax,
140 .extra1 = &zero,
141 .extra2 = &int_max,
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142 },
143 {
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144 .procname = "msgmni",
145 .data = &init_ipc_ns.msg_ctlmni,
239521f3 146 .maxlen = sizeof(init_ipc_ns.msg_ctlmni),
a5494dcd 147 .mode = 0644,
0050ee05 148 .proc_handler = proc_ipc_dointvec_minmax,
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149 .extra1 = &zero,
150 .extra2 = &int_max,
a5494dcd 151 },
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152 {
153 .procname = "auto_msgmni",
154 .data = NULL,
155 .maxlen = sizeof(int),
156 .mode = 0644,
157 .proc_handler = proc_ipc_auto_msgmni,
158 .extra1 = &zero,
159 .extra2 = &one,
160 },
a5494dcd 161 {
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162 .procname = "msgmnb",
163 .data = &init_ipc_ns.msg_ctlmnb,
239521f3 164 .maxlen = sizeof(init_ipc_ns.msg_ctlmnb),
a5494dcd 165 .mode = 0644,
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166 .proc_handler = proc_ipc_dointvec_minmax,
167 .extra1 = &zero,
168 .extra2 = &int_max,
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169 },
170 {
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171 .procname = "sem",
172 .data = &init_ipc_ns.sem_ctls,
239521f3 173 .maxlen = 4*sizeof(int),
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174 .mode = 0644,
175 .proc_handler = proc_ipc_dointvec,
a5494dcd 176 },
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177#ifdef CONFIG_CHECKPOINT_RESTORE
178 {
179 .procname = "sem_next_id",
180 .data = &init_ipc_ns.ids[IPC_SEM_IDS].next_id,
181 .maxlen = sizeof(init_ipc_ns.ids[IPC_SEM_IDS].next_id),
182 .mode = 0644,
183 .proc_handler = proc_ipc_dointvec_minmax,
184 .extra1 = &zero,
185 .extra2 = &int_max,
186 },
187 {
188 .procname = "msg_next_id",
189 .data = &init_ipc_ns.ids[IPC_MSG_IDS].next_id,
190 .maxlen = sizeof(init_ipc_ns.ids[IPC_MSG_IDS].next_id),
191 .mode = 0644,
192 .proc_handler = proc_ipc_dointvec_minmax,
193 .extra1 = &zero,
194 .extra2 = &int_max,
195 },
196 {
197 .procname = "shm_next_id",
198 .data = &init_ipc_ns.ids[IPC_SHM_IDS].next_id,
199 .maxlen = sizeof(init_ipc_ns.ids[IPC_SHM_IDS].next_id),
200 .mode = 0644,
201 .proc_handler = proc_ipc_dointvec_minmax,
202 .extra1 = &zero,
203 .extra2 = &int_max,
204 },
205#endif
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206 {}
207};
208
209static struct ctl_table ipc_root_table[] = {
210 {
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211 .procname = "kernel",
212 .mode = 0555,
213 .child = ipc_kern_table,
214 },
215 {}
216};
217
218static int __init ipc_sysctl_init(void)
219{
0b4d4147 220 register_sysctl_table(ipc_root_table);
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221 return 0;
222}
223
6d08a256 224device_initcall(ipc_sysctl_init);
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