sysctl: Add ctl_table chains into cstring paths

For any component of table passed to __register_sysctl_paths
that actually serves as a path, add that to the cstring path
that is passed to __register_sysctl_table.

The result is that for most calls to __register_sysctl_paths
we only pass a table to __register_sysctl_table that contains
no child directories.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>

diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index 5704ff0..9b91dee 100644 (file)
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -1076,6 +1076,7 @@ struct ctl_table_header *__register_sysctl_paths(
        struct nsproxy *namespaces,
        const struct ctl_path *path, struct ctl_table *table)
 {
+       struct ctl_table *ctl_table_arg = table;
        struct ctl_table_header *header = NULL;
        const struct ctl_path *component;
        char *new_path, *pos;
@@ -1090,7 +1091,15 @@ struct ctl_table_header *__register_sysctl_paths(
                if (!pos)
                        goto out;
        }
+       while (table->procname && table->child && !table[1].procname) {
+               pos = append_path(new_path, pos, table->procname);
+               if (!pos)
+                       goto out;
+               table = table->child;
+       }
        header = __register_sysctl_table(root, namespaces, new_path, table);
+       if (header)
+               header->ctl_table_arg = ctl_table_arg;
 out:
        kfree(new_path);
        return header;