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a5494dcd EB |
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 | ||
91cfb2b4 ND |
38 | static int proc_ipc_callback_dointvec(ctl_table *table, int write, |
39 | struct file *filp, void __user *buffer, size_t *lenp, loff_t *ppos) | |
40 | { | |
41 | size_t lenp_bef = *lenp; | |
42 | int rc; | |
43 | ||
44 | rc = proc_ipc_dointvec(table, write, filp, buffer, lenp, ppos); | |
45 | ||
46 | if (write && !rc && lenp_bef == *lenp) | |
47 | /* | |
48 | * Tunable has successfully been changed from userland: | |
49 | * disable its automatic recomputing. | |
50 | */ | |
51 | unregister_ipcns_notifier(current->nsproxy->ipc_ns); | |
52 | ||
53 | return rc; | |
54 | } | |
55 | ||
a5494dcd EB |
56 | static int proc_ipc_doulongvec_minmax(ctl_table *table, int write, |
57 | struct file *filp, void __user *buffer, size_t *lenp, loff_t *ppos) | |
58 | { | |
59 | struct ctl_table ipc_table; | |
60 | memcpy(&ipc_table, table, sizeof(ipc_table)); | |
61 | ipc_table.data = get_ipc(table); | |
62 | ||
63 | return proc_doulongvec_minmax(&ipc_table, write, filp, buffer, | |
64 | lenp, ppos); | |
65 | } | |
66 | ||
67 | #else | |
68 | #define proc_ipc_doulongvec_minmax NULL | |
69 | #define proc_ipc_dointvec NULL | |
91cfb2b4 | 70 | #define proc_ipc_callback_dointvec NULL |
a5494dcd EB |
71 | #endif |
72 | ||
73 | #ifdef CONFIG_SYSCTL_SYSCALL | |
74 | /* The generic sysctl ipc data routine. */ | |
75 | static int sysctl_ipc_data(ctl_table *table, int __user *name, int nlen, | |
76 | void __user *oldval, size_t __user *oldlenp, | |
77 | void __user *newval, size_t newlen) | |
78 | { | |
79 | size_t len; | |
80 | void *data; | |
81 | ||
82 | /* Get out of I don't have a variable */ | |
83 | if (!table->data || !table->maxlen) | |
84 | return -ENOTDIR; | |
85 | ||
86 | data = get_ipc(table); | |
87 | if (!data) | |
88 | return -ENOTDIR; | |
89 | ||
90 | if (oldval && oldlenp) { | |
91 | if (get_user(len, oldlenp)) | |
92 | return -EFAULT; | |
93 | if (len) { | |
94 | if (len > table->maxlen) | |
95 | len = table->maxlen; | |
96 | if (copy_to_user(oldval, data, len)) | |
97 | return -EFAULT; | |
98 | if (put_user(len, oldlenp)) | |
99 | return -EFAULT; | |
100 | } | |
101 | } | |
102 | ||
103 | if (newval && newlen) { | |
104 | if (newlen > table->maxlen) | |
105 | newlen = table->maxlen; | |
106 | ||
107 | if (copy_from_user(data, newval, newlen)) | |
108 | return -EFAULT; | |
109 | } | |
110 | return 1; | |
111 | } | |
91cfb2b4 ND |
112 | |
113 | static int sysctl_ipc_registered_data(ctl_table *table, int __user *name, | |
114 | int nlen, void __user *oldval, size_t __user *oldlenp, | |
115 | void __user *newval, size_t newlen) | |
116 | { | |
117 | int rc; | |
118 | ||
119 | rc = sysctl_ipc_data(table, name, nlen, oldval, oldlenp, newval, | |
120 | newlen); | |
121 | ||
122 | if (newval && newlen && rc > 0) | |
123 | /* | |
124 | * Tunable has successfully been changed from userland: | |
125 | * disable its automatic recomputing. | |
126 | */ | |
127 | unregister_ipcns_notifier(current->nsproxy->ipc_ns); | |
128 | ||
129 | return rc; | |
130 | } | |
a5494dcd EB |
131 | #else |
132 | #define sysctl_ipc_data NULL | |
91cfb2b4 | 133 | #define sysctl_ipc_registered_data NULL |
a5494dcd EB |
134 | #endif |
135 | ||
136 | static struct ctl_table ipc_kern_table[] = { | |
137 | { | |
138 | .ctl_name = KERN_SHMMAX, | |
139 | .procname = "shmmax", | |
140 | .data = &init_ipc_ns.shm_ctlmax, | |
141 | .maxlen = sizeof (init_ipc_ns.shm_ctlmax), | |
142 | .mode = 0644, | |
143 | .proc_handler = proc_ipc_doulongvec_minmax, | |
144 | .strategy = sysctl_ipc_data, | |
145 | }, | |
146 | { | |
147 | .ctl_name = KERN_SHMALL, | |
148 | .procname = "shmall", | |
149 | .data = &init_ipc_ns.shm_ctlall, | |
150 | .maxlen = sizeof (init_ipc_ns.shm_ctlall), | |
151 | .mode = 0644, | |
152 | .proc_handler = proc_ipc_doulongvec_minmax, | |
153 | .strategy = sysctl_ipc_data, | |
154 | }, | |
155 | { | |
156 | .ctl_name = KERN_SHMMNI, | |
157 | .procname = "shmmni", | |
158 | .data = &init_ipc_ns.shm_ctlmni, | |
159 | .maxlen = sizeof (init_ipc_ns.shm_ctlmni), | |
160 | .mode = 0644, | |
161 | .proc_handler = proc_ipc_dointvec, | |
162 | .strategy = sysctl_ipc_data, | |
163 | }, | |
164 | { | |
165 | .ctl_name = KERN_MSGMAX, | |
166 | .procname = "msgmax", | |
167 | .data = &init_ipc_ns.msg_ctlmax, | |
168 | .maxlen = sizeof (init_ipc_ns.msg_ctlmax), | |
169 | .mode = 0644, | |
170 | .proc_handler = proc_ipc_dointvec, | |
171 | .strategy = sysctl_ipc_data, | |
172 | }, | |
173 | { | |
174 | .ctl_name = KERN_MSGMNI, | |
175 | .procname = "msgmni", | |
176 | .data = &init_ipc_ns.msg_ctlmni, | |
177 | .maxlen = sizeof (init_ipc_ns.msg_ctlmni), | |
178 | .mode = 0644, | |
91cfb2b4 ND |
179 | .proc_handler = proc_ipc_callback_dointvec, |
180 | .strategy = sysctl_ipc_registered_data, | |
a5494dcd EB |
181 | }, |
182 | { | |
183 | .ctl_name = KERN_MSGMNB, | |
184 | .procname = "msgmnb", | |
185 | .data = &init_ipc_ns.msg_ctlmnb, | |
186 | .maxlen = sizeof (init_ipc_ns.msg_ctlmnb), | |
187 | .mode = 0644, | |
188 | .proc_handler = proc_ipc_dointvec, | |
189 | .strategy = sysctl_ipc_data, | |
190 | }, | |
191 | { | |
192 | .ctl_name = KERN_SEM, | |
193 | .procname = "sem", | |
194 | .data = &init_ipc_ns.sem_ctls, | |
195 | .maxlen = 4*sizeof (int), | |
196 | .mode = 0644, | |
197 | .proc_handler = proc_ipc_dointvec, | |
198 | .strategy = sysctl_ipc_data, | |
199 | }, | |
200 | {} | |
201 | }; | |
202 | ||
203 | static struct ctl_table ipc_root_table[] = { | |
204 | { | |
205 | .ctl_name = CTL_KERN, | |
206 | .procname = "kernel", | |
207 | .mode = 0555, | |
208 | .child = ipc_kern_table, | |
209 | }, | |
210 | {} | |
211 | }; | |
212 | ||
213 | static int __init ipc_sysctl_init(void) | |
214 | { | |
0b4d4147 | 215 | register_sysctl_table(ipc_root_table); |
a5494dcd EB |
216 | return 0; |
217 | } | |
218 | ||
219 | __initcall(ipc_sysctl_init); |