1 // SPDX-License-Identifier: GPL-2.0-only
5 * Author: Eric Biederman <ebiederm@xmision.com>
8 #include <linux/module.h>
10 #include <linux/nsproxy.h>
11 #include <linux/sysctl.h>
12 #include <linux/uaccess.h>
13 #include <linux/ipc_namespace.h>
14 #include <linux/msg.h>
17 static void *get_ipc(struct ctl_table
*table
)
19 char *which
= table
->data
;
20 struct ipc_namespace
*ipc_ns
= current
->nsproxy
->ipc_ns
;
21 which
= (which
- (char *)&init_ipc_ns
) + (char *)ipc_ns
;
25 #ifdef CONFIG_PROC_SYSCTL
26 static int proc_ipc_dointvec(struct ctl_table
*table
, int write
,
27 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
29 struct ctl_table ipc_table
;
31 memcpy(&ipc_table
, table
, sizeof(ipc_table
));
32 ipc_table
.data
= get_ipc(table
);
34 return proc_dointvec(&ipc_table
, write
, buffer
, lenp
, ppos
);
37 static int proc_ipc_dointvec_minmax(struct ctl_table
*table
, int write
,
38 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
40 struct ctl_table ipc_table
;
42 memcpy(&ipc_table
, table
, sizeof(ipc_table
));
43 ipc_table
.data
= get_ipc(table
);
45 return proc_dointvec_minmax(&ipc_table
, write
, buffer
, lenp
, ppos
);
48 static int proc_ipc_dointvec_minmax_orphans(struct ctl_table
*table
, int write
,
49 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
51 struct ipc_namespace
*ns
= current
->nsproxy
->ipc_ns
;
52 int err
= proc_ipc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
56 if (ns
->shm_rmid_forced
)
57 shm_destroy_orphaned(ns
);
61 static int proc_ipc_doulongvec_minmax(struct ctl_table
*table
, int write
,
62 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
64 struct ctl_table ipc_table
;
65 memcpy(&ipc_table
, table
, sizeof(ipc_table
));
66 ipc_table
.data
= get_ipc(table
);
68 return proc_doulongvec_minmax(&ipc_table
, write
, buffer
,
72 static int proc_ipc_auto_msgmni(struct ctl_table
*table
, int write
,
73 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
75 struct ctl_table ipc_table
;
78 memcpy(&ipc_table
, table
, sizeof(ipc_table
));
79 ipc_table
.data
= &dummy
;
82 pr_info_once("writing to auto_msgmni has no effect");
84 return proc_dointvec_minmax(&ipc_table
, write
, buffer
, lenp
, ppos
);
87 static int proc_ipc_sem_dointvec(struct ctl_table
*table
, int write
,
88 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
91 struct ipc_namespace
*ns
= current
->nsproxy
->ipc_ns
;
93 semmni
= ns
->sem_ctls
[3];
94 ret
= proc_ipc_dointvec(table
, write
, buffer
, lenp
, ppos
);
97 ret
= sem_check_semmni(current
->nsproxy
->ipc_ns
);
100 * Reset the semmni value if an error happens.
103 ns
->sem_ctls
[3] = semmni
;
108 #define proc_ipc_doulongvec_minmax NULL
109 #define proc_ipc_dointvec NULL
110 #define proc_ipc_dointvec_minmax NULL
111 #define proc_ipc_dointvec_minmax_orphans NULL
112 #define proc_ipc_auto_msgmni NULL
113 #define proc_ipc_sem_dointvec NULL
118 static int int_max
= INT_MAX
;
119 int ipc_mni
= IPCMNI
;
120 int ipc_mni_shift
= IPCMNI_SHIFT
;
121 int ipc_min_cycle
= RADIX_TREE_MAP_SIZE
;
123 static struct ctl_table ipc_kern_table
[] = {
125 .procname
= "shmmax",
126 .data
= &init_ipc_ns
.shm_ctlmax
,
127 .maxlen
= sizeof(init_ipc_ns
.shm_ctlmax
),
129 .proc_handler
= proc_ipc_doulongvec_minmax
,
132 .procname
= "shmall",
133 .data
= &init_ipc_ns
.shm_ctlall
,
134 .maxlen
= sizeof(init_ipc_ns
.shm_ctlall
),
136 .proc_handler
= proc_ipc_doulongvec_minmax
,
139 .procname
= "shmmni",
140 .data
= &init_ipc_ns
.shm_ctlmni
,
141 .maxlen
= sizeof(init_ipc_ns
.shm_ctlmni
),
143 .proc_handler
= proc_ipc_dointvec_minmax
,
148 .procname
= "shm_rmid_forced",
149 .data
= &init_ipc_ns
.shm_rmid_forced
,
150 .maxlen
= sizeof(init_ipc_ns
.shm_rmid_forced
),
152 .proc_handler
= proc_ipc_dointvec_minmax_orphans
,
157 .procname
= "msgmax",
158 .data
= &init_ipc_ns
.msg_ctlmax
,
159 .maxlen
= sizeof(init_ipc_ns
.msg_ctlmax
),
161 .proc_handler
= proc_ipc_dointvec_minmax
,
166 .procname
= "msgmni",
167 .data
= &init_ipc_ns
.msg_ctlmni
,
168 .maxlen
= sizeof(init_ipc_ns
.msg_ctlmni
),
170 .proc_handler
= proc_ipc_dointvec_minmax
,
175 .procname
= "auto_msgmni",
177 .maxlen
= sizeof(int),
179 .proc_handler
= proc_ipc_auto_msgmni
,
184 .procname
= "msgmnb",
185 .data
= &init_ipc_ns
.msg_ctlmnb
,
186 .maxlen
= sizeof(init_ipc_ns
.msg_ctlmnb
),
188 .proc_handler
= proc_ipc_dointvec_minmax
,
194 .data
= &init_ipc_ns
.sem_ctls
,
195 .maxlen
= 4*sizeof(int),
197 .proc_handler
= proc_ipc_sem_dointvec
,
199 #ifdef CONFIG_CHECKPOINT_RESTORE
201 .procname
= "sem_next_id",
202 .data
= &init_ipc_ns
.ids
[IPC_SEM_IDS
].next_id
,
203 .maxlen
= sizeof(init_ipc_ns
.ids
[IPC_SEM_IDS
].next_id
),
205 .proc_handler
= proc_ipc_dointvec_minmax
,
210 .procname
= "msg_next_id",
211 .data
= &init_ipc_ns
.ids
[IPC_MSG_IDS
].next_id
,
212 .maxlen
= sizeof(init_ipc_ns
.ids
[IPC_MSG_IDS
].next_id
),
214 .proc_handler
= proc_ipc_dointvec_minmax
,
219 .procname
= "shm_next_id",
220 .data
= &init_ipc_ns
.ids
[IPC_SHM_IDS
].next_id
,
221 .maxlen
= sizeof(init_ipc_ns
.ids
[IPC_SHM_IDS
].next_id
),
223 .proc_handler
= proc_ipc_dointvec_minmax
,
231 static struct ctl_table ipc_root_table
[] = {
233 .procname
= "kernel",
235 .child
= ipc_kern_table
,
240 static int __init
ipc_sysctl_init(void)
242 register_sysctl_table(ipc_root_table
);
246 device_initcall(ipc_sysctl_init
);
248 static int __init
ipc_mni_extend(char *str
)
250 ipc_mni
= IPCMNI_EXTEND
;
251 ipc_mni_shift
= IPCMNI_EXTEND_SHIFT
;
252 ipc_min_cycle
= IPCMNI_EXTEND_MIN_CYCLE
;
253 pr_info("IPCMNI extended to %d.\n", ipc_mni
);
256 early_param("ipcmni_extend", ipc_mni_extend
);