161 lines
3.8 KiB
C
161 lines
3.8 KiB
C
#include <linux/stat.h>
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#include <linux/sysctl.h>
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#include "../fs/xfs/xfs_sysctl.h"
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#include <linux/sunrpc/debug.h>
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#include <linux/string.h>
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#include <net/ip_vs.h>
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static int sysctl_depth(struct ctl_table *table)
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{
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struct ctl_table *tmp;
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int depth;
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depth = 0;
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for (tmp = table; tmp->parent; tmp = tmp->parent)
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depth++;
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return depth;
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}
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static struct ctl_table *sysctl_parent(struct ctl_table *table, int n)
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{
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int i;
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for (i = 0; table && i < n; i++)
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table = table->parent;
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return table;
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}
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static void sysctl_print_path(struct ctl_table *table)
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{
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struct ctl_table *tmp;
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int depth, i;
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depth = sysctl_depth(table);
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if (table->procname) {
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for (i = depth; i >= 0; i--) {
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tmp = sysctl_parent(table, i);
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printk("/%s", tmp->procname?tmp->procname:"");
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}
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}
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printk(" ");
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}
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static struct ctl_table *sysctl_check_lookup(struct nsproxy *namespaces,
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struct ctl_table *table)
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{
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struct ctl_table_header *head;
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struct ctl_table *ref, *test;
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int depth, cur_depth;
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depth = sysctl_depth(table);
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for (head = __sysctl_head_next(namespaces, NULL); head;
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head = __sysctl_head_next(namespaces, head)) {
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cur_depth = depth;
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ref = head->ctl_table;
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repeat:
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test = sysctl_parent(table, cur_depth);
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for (; ref->procname; ref++) {
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int match = 0;
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if (cur_depth && !ref->child)
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continue;
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if (test->procname && ref->procname &&
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(strcmp(test->procname, ref->procname) == 0))
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match++;
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if (match) {
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if (cur_depth != 0) {
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cur_depth--;
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ref = ref->child;
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goto repeat;
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}
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goto out;
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}
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}
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}
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ref = NULL;
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out:
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sysctl_head_finish(head);
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return ref;
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}
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static void set_fail(const char **fail, struct ctl_table *table, const char *str)
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{
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if (*fail) {
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printk(KERN_ERR "sysctl table check failed: ");
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sysctl_print_path(table);
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printk(" %s\n", *fail);
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dump_stack();
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}
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*fail = str;
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}
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static void sysctl_check_leaf(struct nsproxy *namespaces,
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struct ctl_table *table, const char **fail)
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{
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struct ctl_table *ref;
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ref = sysctl_check_lookup(namespaces, table);
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if (ref && (ref != table))
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set_fail(fail, table, "Sysctl already exists");
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}
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int sysctl_check_table(struct nsproxy *namespaces, struct ctl_table *table)
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{
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int error = 0;
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for (; table->procname; table++) {
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const char *fail = NULL;
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if (table->parent) {
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if (!table->parent->procname)
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set_fail(&fail, table, "Parent without procname");
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}
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if (table->child) {
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if (table->data)
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set_fail(&fail, table, "Directory with data?");
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if (table->maxlen)
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set_fail(&fail, table, "Directory with maxlen?");
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if ((table->mode & (S_IRUGO|S_IXUGO)) != table->mode)
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set_fail(&fail, table, "Writable sysctl directory");
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if (table->proc_handler)
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set_fail(&fail, table, "Directory with proc_handler");
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if (table->extra1)
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set_fail(&fail, table, "Directory with extra1");
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if (table->extra2)
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set_fail(&fail, table, "Directory with extra2");
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} else {
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if ((table->proc_handler == proc_dostring) ||
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(table->proc_handler == proc_dointvec) ||
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(table->proc_handler == proc_dointvec_minmax) ||
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(table->proc_handler == proc_dointvec_jiffies) ||
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(table->proc_handler == proc_dointvec_userhz_jiffies) ||
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(table->proc_handler == proc_dointvec_ms_jiffies) ||
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(table->proc_handler == proc_doulongvec_minmax) ||
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(table->proc_handler == proc_doulongvec_ms_jiffies_minmax)) {
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if (!table->data)
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set_fail(&fail, table, "No data");
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if (!table->maxlen)
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set_fail(&fail, table, "No maxlen");
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}
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#ifdef CONFIG_PROC_SYSCTL
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if (!table->proc_handler)
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set_fail(&fail, table, "No proc_handler");
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#endif
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sysctl_check_leaf(namespaces, table, &fail);
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}
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if (table->mode > 0777)
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set_fail(&fail, table, "bogus .mode");
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if (fail) {
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set_fail(&fail, table, NULL);
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error = -EINVAL;
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}
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if (table->child)
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error |= sysctl_check_table(namespaces, table->child);
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}
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return error;
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}
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