| 1 | #include <linux/stat.h>
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| 2 | #include <linux/sysctl.h>
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| 3 | #include "../fs/xfs/linux-2.6/xfs_sysctl.h"
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| 4 | #include <linux/sunrpc/debug.h>
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| 5 | #include <linux/string.h>
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| 6 | #include <net/ip_vs.h>
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| 7 |
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| 8 |
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| 9 | static int sysctl_depth(struct ctl_table *table)
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| 10 | {
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| 11 | struct ctl_table *tmp;
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| 12 | int depth;
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| 13 |
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| 14 | depth = 0;
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| 15 | for (tmp = table; tmp->parent; tmp = tmp->parent)
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| 16 | depth++;
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| 17 |
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| 18 | return depth;
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| 19 | }
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| 20 |
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| 21 | static struct ctl_table *sysctl_parent(struct ctl_table *table, int n)
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| 22 | {
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| 23 | int i;
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| 24 |
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| 25 | for (i = 0; table && i < n; i++)
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| 26 | table = table->parent;
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| 27 |
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| 28 | return table;
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| 29 | }
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| 30 |
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| 31 |
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| 32 | static void sysctl_print_path(struct ctl_table *table)
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| 33 | {
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| 34 | struct ctl_table *tmp;
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| 35 | int depth, i;
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| 36 | depth = sysctl_depth(table);
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| 37 | if (table->procname) {
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| 38 | for (i = depth; i >= 0; i--) {
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| 39 | tmp = sysctl_parent(table, i);
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| 40 | printk("/%s", tmp->procname?tmp->procname:"");
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| 41 | }
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| 42 | }
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| 43 | printk(" ");
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| 44 | }
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| 45 |
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| 46 | static struct ctl_table *sysctl_check_lookup(struct nsproxy *namespaces,
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| 47 | struct ctl_table *table)
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| 48 | {
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| 49 | struct ctl_table_header *head;
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| 50 | struct ctl_table *ref, *test;
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| 51 | int depth, cur_depth;
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| 52 |
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| 53 | depth = sysctl_depth(table);
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| 54 |
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| 55 | for (head = __sysctl_head_next(namespaces, NULL); head;
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| 56 | head = __sysctl_head_next(namespaces, head)) {
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| 57 | cur_depth = depth;
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| 58 | ref = head->ctl_table;
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| 59 | repeat:
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| 60 | test = sysctl_parent(table, cur_depth);
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| 61 | for (; ref->procname; ref++) {
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| 62 | int match = 0;
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| 63 | if (cur_depth && !ref->child)
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| 64 | continue;
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| 65 |
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| 66 | if (test->procname && ref->procname &&
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| 67 | (strcmp(test->procname, ref->procname) == 0))
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| 68 | match++;
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| 69 |
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| 70 | if (match) {
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| 71 | if (cur_depth != 0) {
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| 72 | cur_depth--;
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| 73 | ref = ref->child;
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| 74 | goto repeat;
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| 75 | }
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| 76 | goto out;
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| 77 | }
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| 78 | }
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| 79 | }
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| 80 | ref = NULL;
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| 81 | out:
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| 82 | sysctl_head_finish(head);
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| 83 | return ref;
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| 84 | }
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| 85 |
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| 86 | static void set_fail(const char **fail, struct ctl_table *table, const char *str)
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| 87 | {
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| 88 | if (*fail) {
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| 89 | printk(KERN_ERR "sysctl table check failed: ");
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| 90 | sysctl_print_path(table);
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| 91 | printk(" %s\n", *fail);
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| 92 | dump_stack();
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| 93 | }
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| 94 | *fail = str;
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| 95 | }
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| 96 |
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| 97 | static void sysctl_check_leaf(struct nsproxy *namespaces,
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| 98 | struct ctl_table *table, const char **fail)
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| 99 | {
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| 100 | struct ctl_table *ref;
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| 101 |
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| 102 | ref = sysctl_check_lookup(namespaces, table);
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| 103 | if (ref && (ref != table))
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| 104 | set_fail(fail, table, "Sysctl already exists");
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| 105 | }
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| 106 |
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| 107 | int sysctl_check_table(struct nsproxy *namespaces, struct ctl_table *table)
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| 108 | {
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| 109 | int error = 0;
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| 110 | for (; table->procname; table++) {
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| 111 | const char *fail = NULL;
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| 112 |
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| 113 | if (table->parent) {
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| 114 | if (!table->parent->procname)
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| 115 | set_fail(&fail, table, "Parent without procname");
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| 116 | }
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| 117 | if (table->child) {
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| 118 | if (table->data)
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| 119 | set_fail(&fail, table, "Directory with data?");
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| 120 | if (table->maxlen)
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| 121 | set_fail(&fail, table, "Directory with maxlen?");
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| 122 | if ((table->mode & (S_IRUGO|S_IXUGO)) != table->mode)
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| 123 | set_fail(&fail, table, "Writable sysctl directory");
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| 124 | if (table->proc_handler)
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| 125 | set_fail(&fail, table, "Directory with proc_handler");
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| 126 | if (table->extra1)
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| 127 | set_fail(&fail, table, "Directory with extra1");
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| 128 | if (table->extra2)
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| 129 | set_fail(&fail, table, "Directory with extra2");
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| 130 | } else {
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| 131 | if ((table->proc_handler == proc_dostring) ||
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| 132 | (table->proc_handler == proc_dointvec) ||
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| 133 | (table->proc_handler == proc_dointvec_minmax) ||
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| 134 | (table->proc_handler == proc_dointvec_jiffies) ||
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| 135 | (table->proc_handler == proc_dointvec_userhz_jiffies) ||
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| 136 | (table->proc_handler == proc_dointvec_ms_jiffies) ||
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| 137 | (table->proc_handler == proc_doulongvec_minmax) ||
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| 138 | (table->proc_handler == proc_doulongvec_ms_jiffies_minmax)) {
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| 139 | if (!table->data)
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| 140 | set_fail(&fail, table, "No data");
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| 141 | if (!table->maxlen)
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| 142 | set_fail(&fail, table, "No maxlen");
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| 143 | }
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| 144 | #ifdef CONFIG_PROC_SYSCTL
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| 145 | if (!table->proc_handler)
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| 146 | set_fail(&fail, table, "No proc_handler");
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| 147 | #endif
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| 148 | sysctl_check_leaf(namespaces, table, &fail);
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| 149 | }
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| 150 | if (table->mode > 0777)
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| 151 | set_fail(&fail, table, "bogus .mode");
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| 152 | if (fail) {
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| 153 | set_fail(&fail, table, NULL);
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| 154 | error = -EINVAL;
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| 155 | }
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| 156 | if (table->child)
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| 157 | error |= sysctl_check_table(namespaces, table->child);
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| 158 | }
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| 159 | return error;
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| 160 | }
|