sysctl: Allow creating permanently empty directories that serve as mountpoints.

Add a magic sysctl table sysctl_mount_point that when used to
create a directory forces that directory to be permanently empty.

Update the code to use make_empty_dir_inode when accessing permanently
empty directories.

Update the code to not allow adding to permanently empty directories.

Update /proc/sys/fs/binfmt_misc to be a permanently empty directory.

Cc: stable@vger.kernel.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index fea2561..fdda62e 100644 (file)
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -19,6 +19,28 @@ static const struct inode_operations proc_sys_inode_operations;
 static const struct file_operations proc_sys_dir_file_operations;
 static const struct inode_operations proc_sys_dir_operations;
 
+/* Support for permanently empty directories */
+
+struct ctl_table sysctl_mount_point[] = {
+       { }
+};
+
+static bool is_empty_dir(struct ctl_table_header *head)
+{
+       return head->ctl_table[0].child == sysctl_mount_point;
+}
+
+static void set_empty_dir(struct ctl_dir *dir)
+{
+       dir->header.ctl_table[0].child = sysctl_mount_point;
+}
+
+static void clear_empty_dir(struct ctl_dir *dir)
+
+{
+       dir->header.ctl_table[0].child = NULL;
+}
+
 void proc_sys_poll_notify(struct ctl_table_poll *poll)
 {
        if (!poll)
@@ -187,6 +209,17 @@ static int insert_header(struct ctl_dir *dir, struct ctl_table_header *header)
        struct ctl_table *entry;
        int err;
 
+       /* Is this a permanently empty directory? */
+       if (is_empty_dir(&dir->header))
+               return -EROFS;
+
+       /* Am I creating a permanently empty directory? */
+       if (header->ctl_table == sysctl_mount_point) {
+               if (!RB_EMPTY_ROOT(&dir->root))
+                       return -EINVAL;
+               set_empty_dir(dir);
+       }
+
        dir->header.nreg++;
        header->parent = dir;
        err = insert_links(header);
@@ -202,6 +235,8 @@ fail:
        erase_header(header);
        put_links(header);
 fail_links:
+       if (header->ctl_table == sysctl_mount_point)
+               clear_empty_dir(dir);
        header->parent = NULL;
        drop_sysctl_table(&dir->header);
        return err;
@@ -419,6 +454,8 @@ static struct inode *proc_sys_make_inode(struct super_block *sb,
                inode->i_mode |= S_IFDIR;
                inode->i_op = &proc_sys_dir_operations;
                inode->i_fop = &proc_sys_dir_file_operations;
+               if (is_empty_dir(head))
+                       make_empty_dir_inode(inode);
        }
 out:
        return inode;

diff --cc include/linux/sysctl.h
Simple merge

diff --cc kernel/sysctl.c
Simple merge