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>
7 #include <linux/syscalls.h>
8 #include <linux/namei.h>
9 #include <linux/mount.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>
17 #ifdef CONFIG_SYSCTL_SYSCALL
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)
31 if (sysctl_perm(root, table, op))
34 if (table->strategy) {
35 rc = table->strategy(table, oldval, oldlenp, newval, newlen);
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);
52 static int parse_table(const int *name, int nlen,
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)
63 for ( ; table->ctl_name || table->procname; table++) {
66 if (n == table->ctl_name) {
69 if (sysctl_perm(root, table, MAY_EXEC))
76 error = do_sysctl_strategy(root, table,
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)
90 struct ctl_table_header *head;
91 ssize_t error = -ENOTDIR;
93 for (head = sysctl_head_next(NULL); head;
94 head = sysctl_head_next(head)) {
95 error = parse_table(name, nlen, oldval, oldlenp,
97 head->root, head->ctl_table);
98 if (error != -ENOTDIR) {
99 sysctl_head_finish(head);
106 #else /* CONFIG_SYSCTL_SYSCALL */
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)
115 #endif /* CONFIG_SYSCTL_SYSCALL */
117 static void deprecated_sysctl_warning(const int *name, int nlen)
119 static int msg_count;
122 /* Ignore accesses to kernel.version */
123 if ((nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
129 "warning: process `%s' used the deprecated sysctl "
130 "system call with ", current->comm);
131 for (i = 0; i < nlen; i++)
132 printk("%d.", name[i]);
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)
142 int name[CTL_MAXNAME];
146 if (nlen <= 0 || nlen >= CTL_MAXNAME)
148 if (oldval && !oldlenp)
150 if (oldlenp && get_user(oldlen, oldlenp))
153 /* Read in the sysctl name for simplicity */
154 for (i = 0; i < nlen; i++)
155 if (get_user(name[i], args_name + i))
158 deprecated_sysctl_warning(name, nlen);
160 return binary_sysctl(name, nlen, oldval, oldlenp, newval, newlen);
164 SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
166 struct __sysctl_args tmp;
169 if (copy_from_user(&tmp, args, sizeof(tmp)))
173 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
174 tmp.newval, tmp.newlen);