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>
9 static int sysctl_depth(struct ctl_table *table)
11 struct ctl_table *tmp;
15 for (tmp = table; tmp->parent; tmp = tmp->parent)
21 static struct ctl_table *sysctl_parent(struct ctl_table *table, int n)
25 for (i = 0; table && i < n; i++)
26 table = table->parent;
32 static void sysctl_print_path(struct ctl_table *table)
34 struct ctl_table *tmp;
36 depth = sysctl_depth(table);
37 if (table->procname) {
38 for (i = depth; i >= 0; i--) {
39 tmp = sysctl_parent(table, i);
40 printk("/%s", tmp->procname?tmp->procname:"");
46 static struct ctl_table *sysctl_check_lookup(struct nsproxy *namespaces,
47 struct ctl_table *table)
49 struct ctl_table_header *head;
50 struct ctl_table *ref, *test;
53 depth = sysctl_depth(table);
55 for (head = __sysctl_head_next(namespaces, NULL); head;
56 head = __sysctl_head_next(namespaces, head)) {
58 ref = head->ctl_table;
60 test = sysctl_parent(table, cur_depth);
61 for (; ref->procname; ref++) {
63 if (cur_depth && !ref->child)
66 if (test->procname && ref->procname &&
67 (strcmp(test->procname, ref->procname) == 0))
82 sysctl_head_finish(head);
86 static void set_fail(const char **fail, struct ctl_table *table, const char *str)
89 printk(KERN_ERR "sysctl table check failed: ");
90 sysctl_print_path(table);
91 printk(" %s\n", *fail);
97 static void sysctl_check_leaf(struct nsproxy *namespaces,
98 struct ctl_table *table, const char **fail)
100 struct ctl_table *ref;
102 ref = sysctl_check_lookup(namespaces, table);
103 if (ref && (ref != table))
104 set_fail(fail, table, "Sysctl already exists");
107 int sysctl_check_table(struct nsproxy *namespaces, struct ctl_table *table)
110 for (; table->procname; table++) {
111 const char *fail = NULL;
114 if (table->procname && !table->parent->procname)
115 set_fail(&fail, table, "Parent without procname");
117 if (!table->procname)
118 set_fail(&fail, table, "No procname");
121 set_fail(&fail, table, "Directory with data?");
123 set_fail(&fail, table, "Directory with maxlen?");
124 if ((table->mode & (S_IRUGO|S_IXUGO)) != table->mode)
125 set_fail(&fail, table, "Writable sysctl directory");
126 if (table->proc_handler)
127 set_fail(&fail, table, "Directory with proc_handler");
129 set_fail(&fail, table, "Directory with extra1");
131 set_fail(&fail, table, "Directory with extra2");
133 if ((table->proc_handler == proc_dostring) ||
134 (table->proc_handler == proc_dointvec) ||
135 (table->proc_handler == proc_dointvec_minmax) ||
136 (table->proc_handler == proc_dointvec_jiffies) ||
137 (table->proc_handler == proc_dointvec_userhz_jiffies) ||
138 (table->proc_handler == proc_dointvec_ms_jiffies) ||
139 (table->proc_handler == proc_doulongvec_minmax) ||
140 (table->proc_handler == proc_doulongvec_ms_jiffies_minmax)) {
142 set_fail(&fail, table, "No data");
144 set_fail(&fail, table, "No maxlen");
146 #ifdef CONFIG_PROC_SYSCTL
147 if (table->procname && !table->proc_handler)
148 set_fail(&fail, table, "No proc_handler");
151 if (!table->procname && table->proc_handler)
152 set_fail(&fail, table, "proc_handler without procname");
154 sysctl_check_leaf(namespaces, table, &fail);
156 if (table->mode > 0777)
157 set_fail(&fail, table, "bogus .mode");
159 set_fail(&fail, table, NULL);
163 error |= sysctl_check_table(namespaces, table->child);