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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> |
a5494dcd | 18 | |
a5494dcd EB |
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 | } | |
a5494dcd EB |
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 | { | |
0b4d4147 | 176 | register_sysctl_table(ipc_root_table); |
a5494dcd EB |
177 | return 0; |
178 | } | |
179 | ||
180 | __initcall(ipc_sysctl_init); |