4 * Author: Eric Biederman <ebiederm@xmision.com>
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
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>
17 #include <linux/ipc_namespace.h>
18 #include <linux/msg.h>
21 static void *get_ipc(ctl_table
*table
)
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
;
29 #ifdef CONFIG_PROC_SYSCTL
30 static int proc_ipc_dointvec(ctl_table
*table
, int write
,
31 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
33 struct ctl_table ipc_table
;
35 memcpy(&ipc_table
, table
, sizeof(ipc_table
));
36 ipc_table
.data
= get_ipc(table
);
38 return proc_dointvec(&ipc_table
, write
, buffer
, lenp
, ppos
);
41 static int proc_ipc_dointvec_minmax(ctl_table
*table
, int write
,
42 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
44 struct ctl_table ipc_table
;
46 memcpy(&ipc_table
, table
, sizeof(ipc_table
));
47 ipc_table
.data
= get_ipc(table
);
49 return proc_dointvec_minmax(&ipc_table
, write
, buffer
, lenp
, ppos
);
52 static int proc_ipc_dointvec_minmax_orphans(ctl_table
*table
, int write
,
53 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
55 struct ipc_namespace
*ns
= current
->nsproxy
->ipc_ns
;
56 int err
= proc_ipc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
60 if (ns
->shm_rmid_forced
)
61 shm_destroy_orphaned(ns
);
65 static int proc_ipc_callback_dointvec_minmax(ctl_table
*table
, int write
,
66 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
68 struct ctl_table ipc_table
;
69 size_t lenp_bef
= *lenp
;
72 memcpy(&ipc_table
, table
, sizeof(ipc_table
));
73 ipc_table
.data
= get_ipc(table
);
75 rc
= proc_dointvec_minmax(&ipc_table
, write
, buffer
, lenp
, ppos
);
77 if (write
&& !rc
&& lenp_bef
== *lenp
)
79 * Tunable has successfully been changed by hand. Disable its
80 * automatic adjustment. This simply requires unregistering
81 * the notifiers that trigger recalculation.
83 unregister_ipcns_notifier(current
->nsproxy
->ipc_ns
);
88 static int proc_ipc_doulongvec_minmax(ctl_table
*table
, int write
,
89 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
91 struct ctl_table ipc_table
;
92 memcpy(&ipc_table
, table
, sizeof(ipc_table
));
93 ipc_table
.data
= get_ipc(table
);
95 return proc_doulongvec_minmax(&ipc_table
, write
, buffer
,
100 * Routine that is called when the file "auto_msgmni" has successfully been
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.
108 static void ipc_auto_callback(int val
)
111 unregister_ipcns_notifier(current
->nsproxy
->ipc_ns
);
114 * Re-enable automatic recomputing only if not already
117 recompute_msgmni(current
->nsproxy
->ipc_ns
);
118 cond_register_ipcns_notifier(current
->nsproxy
->ipc_ns
);
122 static int proc_ipcauto_dointvec_minmax(ctl_table
*table
, int write
,
123 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
125 struct ctl_table ipc_table
;
126 size_t lenp_bef
= *lenp
;
130 memcpy(&ipc_table
, table
, sizeof(ipc_table
));
131 ipc_table
.data
= get_ipc(table
);
132 oldval
= *((int *)(ipc_table
.data
));
134 rc
= proc_dointvec_minmax(&ipc_table
, write
, buffer
, lenp
, ppos
);
136 if (write
&& !rc
&& lenp_bef
== *lenp
) {
137 int newval
= *((int *)(ipc_table
.data
));
139 * The file "auto_msgmni" has correctly been set.
140 * React by (un)registering the corresponding tunable, if the
143 if (newval
!= oldval
)
144 ipc_auto_callback(newval
);
151 #define proc_ipc_doulongvec_minmax NULL
152 #define proc_ipc_dointvec NULL
153 #define proc_ipc_dointvec_minmax NULL
154 #define proc_ipc_dointvec_minmax_orphans NULL
155 #define proc_ipc_callback_dointvec_minmax NULL
156 #define proc_ipcauto_dointvec_minmax NULL
161 static int int_max
= INT_MAX
;
163 static struct ctl_table ipc_kern_table
[] = {
165 .procname
= "shmmax",
166 .data
= &init_ipc_ns
.shm_ctlmax
,
167 .maxlen
= sizeof (init_ipc_ns
.shm_ctlmax
),
169 .proc_handler
= proc_ipc_doulongvec_minmax
,
172 .procname
= "shmall",
173 .data
= &init_ipc_ns
.shm_ctlall
,
174 .maxlen
= sizeof (init_ipc_ns
.shm_ctlall
),
176 .proc_handler
= proc_ipc_doulongvec_minmax
,
179 .procname
= "shmmni",
180 .data
= &init_ipc_ns
.shm_ctlmni
,
181 .maxlen
= sizeof (init_ipc_ns
.shm_ctlmni
),
183 .proc_handler
= proc_ipc_dointvec
,
186 .procname
= "shm_rmid_forced",
187 .data
= &init_ipc_ns
.shm_rmid_forced
,
188 .maxlen
= sizeof(init_ipc_ns
.shm_rmid_forced
),
190 .proc_handler
= proc_ipc_dointvec_minmax_orphans
,
195 .procname
= "msgmax",
196 .data
= &init_ipc_ns
.msg_ctlmax
,
197 .maxlen
= sizeof (init_ipc_ns
.msg_ctlmax
),
199 .proc_handler
= proc_ipc_dointvec_minmax
,
204 .procname
= "msgmni",
205 .data
= &init_ipc_ns
.msg_ctlmni
,
206 .maxlen
= sizeof (init_ipc_ns
.msg_ctlmni
),
208 .proc_handler
= proc_ipc_callback_dointvec_minmax
,
213 .procname
= "msgmnb",
214 .data
= &init_ipc_ns
.msg_ctlmnb
,
215 .maxlen
= sizeof (init_ipc_ns
.msg_ctlmnb
),
217 .proc_handler
= proc_ipc_dointvec_minmax
,
223 .data
= &init_ipc_ns
.sem_ctls
,
224 .maxlen
= 4*sizeof (int),
226 .proc_handler
= proc_ipc_dointvec
,
229 .procname
= "auto_msgmni",
230 .data
= &init_ipc_ns
.auto_msgmni
,
231 .maxlen
= sizeof(int),
233 .proc_handler
= proc_ipcauto_dointvec_minmax
,
237 #ifdef CONFIG_CHECKPOINT_RESTORE
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
),
243 .proc_handler
= proc_ipc_dointvec_minmax
,
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
),
252 .proc_handler
= proc_ipc_dointvec_minmax
,
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
),
261 .proc_handler
= proc_ipc_dointvec_minmax
,
269 static struct ctl_table ipc_root_table
[] = {
271 .procname
= "kernel",
273 .child
= ipc_kern_table
,
278 static int __init
ipc_sysctl_init(void)
280 register_sysctl_table(ipc_root_table
);
284 __initcall(ipc_sysctl_init
);