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afa588b2 EB |
1 | #include <linux/stat.h> |
2 | #include <linux/sysctl.h> | |
3 | #include "../fs/xfs/linux-2.6/xfs_sysctl.h" | |
4 | #include <linux/sunrpc/debug.h> | |
5 | #include <linux/string.h> | |
6 | #include <net/ip_vs.h> | |
7 | #include <linux/syscalls.h> | |
8 | #include <linux/namei.h> | |
9 | #include <linux/mount.h> | |
10 | #include <linux/fs.h> | |
11 | #include <linux/nsproxy.h> | |
12 | #include <linux/pid_namespace.h> | |
13 | #include <linux/file.h> | |
14 | #include <linux/ctype.h> | |
15 | #include <linux/smp_lock.h> | |
16 | ||
afa588b2 EB |
17 | #ifdef CONFIG_SYSCTL_SYSCALL |
18 | ||
19 | /* Perform the actual read/write of a sysctl table entry. */ | |
20 | static int do_sysctl_strategy(struct ctl_table_root *root, | |
21 | struct ctl_table *table, | |
22 | void __user *oldval, size_t __user *oldlenp, | |
23 | void __user *newval, size_t newlen) | |
24 | { | |
25 | int op = 0, rc; | |
26 | ||
27 | if (oldval) | |
28 | op |= MAY_READ; | |
29 | if (newval) | |
30 | op |= MAY_WRITE; | |
31 | if (sysctl_perm(root, table, op)) | |
32 | return -EPERM; | |
33 | ||
34 | if (table->strategy) { | |
35 | rc = table->strategy(table, oldval, oldlenp, newval, newlen); | |
36 | if (rc < 0) | |
37 | return rc; | |
38 | if (rc > 0) | |
39 | return 0; | |
40 | } | |
41 | ||
42 | /* If there is no strategy routine, or if the strategy returns | |
43 | * zero, proceed with automatic r/w */ | |
44 | if (table->data && table->maxlen) { | |
45 | rc = sysctl_data(table, oldval, oldlenp, newval, newlen); | |
46 | if (rc < 0) | |
47 | return rc; | |
48 | } | |
49 | return 0; | |
50 | } | |
51 | ||
2830b683 | 52 | static int parse_table(const int *name, int nlen, |
afa588b2 EB |
53 | void __user *oldval, size_t __user *oldlenp, |
54 | void __user *newval, size_t newlen, | |
55 | struct ctl_table_root *root, | |
56 | struct ctl_table *table) | |
57 | { | |
58 | int n; | |
59 | repeat: | |
60 | if (!nlen) | |
61 | return -ENOTDIR; | |
2830b683 | 62 | n = *name; |
afa588b2 EB |
63 | for ( ; table->ctl_name || table->procname; table++) { |
64 | if (!table->ctl_name) | |
65 | continue; | |
66 | if (n == table->ctl_name) { | |
67 | int error; | |
68 | if (table->child) { | |
69 | if (sysctl_perm(root, table, MAY_EXEC)) | |
70 | return -EPERM; | |
71 | name++; | |
72 | nlen--; | |
73 | table = table->child; | |
74 | goto repeat; | |
75 | } | |
76 | error = do_sysctl_strategy(root, table, | |
77 | oldval, oldlenp, | |
78 | newval, newlen); | |
79 | return error; | |
80 | } | |
81 | } | |
82 | return -ENOTDIR; | |
83 | } | |
84 | ||
2830b683 EB |
85 | static ssize_t binary_sysctl(const int *name, int nlen, |
86 | void __user *oldval, size_t __user *oldlenp, | |
87 | void __user *newval, size_t newlen) | |
88 | ||
afa588b2 EB |
89 | { |
90 | struct ctl_table_header *head; | |
2830b683 | 91 | ssize_t error = -ENOTDIR; |
afa588b2 EB |
92 | |
93 | for (head = sysctl_head_next(NULL); head; | |
94 | head = sysctl_head_next(head)) { | |
95 | error = parse_table(name, nlen, oldval, oldlenp, | |
96 | newval, newlen, | |
97 | head->root, head->ctl_table); | |
98 | if (error != -ENOTDIR) { | |
99 | sysctl_head_finish(head); | |
100 | break; | |
101 | } | |
102 | } | |
103 | return error; | |
104 | } | |
105 | ||
afa588b2 EB |
106 | #else /* CONFIG_SYSCTL_SYSCALL */ |
107 | ||
2830b683 EB |
108 | static ssize_t binary_sysctl(const int *ctl_name, int nlen, |
109 | void __user *oldval, size_t __user *oldlenp, | |
110 | void __user *newval, size_t newlen) | |
afa588b2 | 111 | { |
2830b683 | 112 | return -ENOSYS; |
afa588b2 EB |
113 | } |
114 | ||
115 | #endif /* CONFIG_SYSCTL_SYSCALL */ | |
116 | ||
2830b683 | 117 | static void deprecated_sysctl_warning(const int *name, int nlen) |
afa588b2 EB |
118 | { |
119 | static int msg_count; | |
afa588b2 EB |
120 | int i; |
121 | ||
afa588b2 | 122 | /* Ignore accesses to kernel.version */ |
2830b683 EB |
123 | if ((nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION)) |
124 | return; | |
afa588b2 EB |
125 | |
126 | if (msg_count < 5) { | |
127 | msg_count++; | |
128 | printk(KERN_INFO | |
129 | "warning: process `%s' used the deprecated sysctl " | |
130 | "system call with ", current->comm); | |
2830b683 | 131 | for (i = 0; i < nlen; i++) |
afa588b2 EB |
132 | printk("%d.", name[i]); |
133 | printk("\n"); | |
134 | } | |
2830b683 EB |
135 | return; |
136 | } | |
137 | ||
138 | int do_sysctl(int __user *args_name, int nlen, | |
139 | void __user *oldval, size_t __user *oldlenp, | |
140 | void __user *newval, size_t newlen) | |
141 | { | |
142 | int name[CTL_MAXNAME]; | |
143 | size_t oldlen = 0; | |
144 | int i; | |
145 | ||
146 | if (nlen <= 0 || nlen >= CTL_MAXNAME) | |
147 | return -ENOTDIR; | |
148 | if (oldval && !oldlenp) | |
149 | return -EFAULT; | |
150 | if (oldlenp && get_user(oldlen, oldlenp)) | |
151 | return -EFAULT; | |
152 | ||
153 | /* Read in the sysctl name for simplicity */ | |
154 | for (i = 0; i < nlen; i++) | |
155 | if (get_user(name[i], args_name + i)) | |
156 | return -EFAULT; | |
157 | ||
158 | deprecated_sysctl_warning(name, nlen); | |
159 | ||
160 | return binary_sysctl(name, nlen, oldval, oldlenp, newval, newlen); | |
161 | } | |
162 | ||
163 | ||
164 | SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args) | |
165 | { | |
166 | struct __sysctl_args tmp; | |
167 | int error; | |
168 | ||
169 | if (copy_from_user(&tmp, args, sizeof(tmp))) | |
170 | return -EFAULT; | |
171 | ||
172 | lock_kernel(); | |
173 | error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp, | |
174 | tmp.newval, tmp.newlen); | |
175 | unlock_kernel(); | |
176 | ||
177 | return error; | |
afa588b2 | 178 | } |