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>
17 #include <linux/ipc_namespace.h>
18
19 static void *get_ipc(ctl_table *table)
20 {
21 char *which = table->data;
22 struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns;
23 which = (which - (char *)&init_ipc_ns) + (char *)ipc_ns;
24 return which;
25 }
26
27 #ifdef CONFIG_PROC_FS
28 static int proc_ipc_dointvec(ctl_table *table, int write, struct file *filp,
29 void __user *buffer, size_t *lenp, loff_t *ppos)
30 {
31 struct ctl_table ipc_table;
32 memcpy(&ipc_table, table, sizeof(ipc_table));
33 ipc_table.data = get_ipc(table);
34
35 return proc_dointvec(&ipc_table, write, filp, buffer, lenp, ppos);
36 }
37
38 static int proc_ipc_doulongvec_minmax(ctl_table *table, int write,
39 struct file *filp, void __user *buffer, size_t *lenp, loff_t *ppos)
40 {
41 struct ctl_table ipc_table;
42 memcpy(&ipc_table, table, sizeof(ipc_table));
43 ipc_table.data = get_ipc(table);
44
45 return proc_doulongvec_minmax(&ipc_table, write, filp, buffer,
46 lenp, ppos);
47 }
48
49 #else
50 #define proc_ipc_doulongvec_minmax NULL
51 #define proc_ipc_dointvec NULL
52 #endif
53
54 #ifdef CONFIG_SYSCTL_SYSCALL
55 /* The generic sysctl ipc data routine. */
56 static int sysctl_ipc_data(ctl_table *table, int __user *name, int nlen,
57 void __user *oldval, size_t __user *oldlenp,
58 void __user *newval, size_t newlen)
59 {
60 size_t len;
61 void *data;
62
63 /* Get out of I don't have a variable */
64 if (!table->data || !table->maxlen)
65 return -ENOTDIR;
66
67 data = get_ipc(table);
68 if (!data)
69 return -ENOTDIR;
70
71 if (oldval && oldlenp) {
72 if (get_user(len, oldlenp))
73 return -EFAULT;
74 if (len) {
75 if (len > table->maxlen)
76 len = table->maxlen;
77 if (copy_to_user(oldval, data, len))
78 return -EFAULT;
79 if (put_user(len, oldlenp))
80 return -EFAULT;
81 }
82 }
83
84 if (newval && newlen) {
85 if (newlen > table->maxlen)
86 newlen = table->maxlen;
87
88 if (copy_from_user(data, newval, newlen))
89 return -EFAULT;
90 }
91 return 1;
92 }
93 #else
94 #define sysctl_ipc_data NULL
95 #endif
96
97 static struct ctl_table ipc_kern_table[] = {
98 {
99 .ctl_name = KERN_SHMMAX,
100 .procname = "shmmax",
101 .data = &init_ipc_ns.shm_ctlmax,
102 .maxlen = sizeof (init_ipc_ns.shm_ctlmax),
103 .mode = 0644,
104 .proc_handler = proc_ipc_doulongvec_minmax,
105 .strategy = sysctl_ipc_data,
106 },
107 {
108 .ctl_name = KERN_SHMALL,
109 .procname = "shmall",
110 .data = &init_ipc_ns.shm_ctlall,
111 .maxlen = sizeof (init_ipc_ns.shm_ctlall),
112 .mode = 0644,
113 .proc_handler = proc_ipc_doulongvec_minmax,
114 .strategy = sysctl_ipc_data,
115 },
116 {
117 .ctl_name = KERN_SHMMNI,
118 .procname = "shmmni",
119 .data = &init_ipc_ns.shm_ctlmni,
120 .maxlen = sizeof (init_ipc_ns.shm_ctlmni),
121 .mode = 0644,
122 .proc_handler = proc_ipc_dointvec,
123 .strategy = sysctl_ipc_data,
124 },
125 {
126 .ctl_name = KERN_MSGMAX,
127 .procname = "msgmax",
128 .data = &init_ipc_ns.msg_ctlmax,
129 .maxlen = sizeof (init_ipc_ns.msg_ctlmax),
130 .mode = 0644,
131 .proc_handler = proc_ipc_dointvec,
132 .strategy = sysctl_ipc_data,
133 },
134 {
135 .ctl_name = KERN_MSGMNI,
136 .procname = "msgmni",
137 .data = &init_ipc_ns.msg_ctlmni,
138 .maxlen = sizeof (init_ipc_ns.msg_ctlmni),
139 .mode = 0644,
140 .proc_handler = proc_ipc_dointvec,
141 .strategy = sysctl_ipc_data,
142 },
143 {
144 .ctl_name = KERN_MSGMNB,
145 .procname = "msgmnb",
146 .data = &init_ipc_ns.msg_ctlmnb,
147 .maxlen = sizeof (init_ipc_ns.msg_ctlmnb),
148 .mode = 0644,
149 .proc_handler = proc_ipc_dointvec,
150 .strategy = sysctl_ipc_data,
151 },
152 {
153 .ctl_name = KERN_SEM,
154 .procname = "sem",
155 .data = &init_ipc_ns.sem_ctls,
156 .maxlen = 4*sizeof (int),
157 .mode = 0644,
158 .proc_handler = proc_ipc_dointvec,
159 .strategy = sysctl_ipc_data,
160 },
161 {}
162 };
163
164 static struct ctl_table ipc_root_table[] = {
165 {
166 .ctl_name = CTL_KERN,
167 .procname = "kernel",
168 .mode = 0555,
169 .child = ipc_kern_table,
170 },
171 {}
172 };
173
174 static int __init ipc_sysctl_init(void)
175 {
176 register_sysctl_table(ipc_root_table);
177 return 0;
178 }
179
180 __initcall(ipc_sysctl_init);
181
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