selinux: prune /sys/fs/selinux/disable

commit 19cfa0099024bb9cd40f6d950caa7f47ff8e77f6 upstream.

Commit f22f9aa ("selinux: remove the runtime disable
functionality") removed the underlying SELinux runtime disable
functionality but left everything else intact and started logging an
error message to warn any residual users.

Prune it to just log an error message once and to return count
(i.e. all bytes written successfully) to avoid breaking
userspace. This also fixes a local DoS from logspam.

Cc: stable@vger.kernel.org
Signed-off-by: Stephen Smalley <stephen.smalley.work@gmail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 4aec732807c51929e8467fd80507db477e114c1e)
Signed-off-by: Wentao Guan <guanwentao@uniontech.com>

Author: stephensmalley

security/selinux/selinuxfs.c

@@ -272,35 +272,13 @@ static ssize_t sel_write_disable(struct file *file, const char __user *buf,
 				 size_t count, loff_t *ppos)
 
 {
-	char *page;
-	ssize_t length;
-	int new_value;
-
-	if (count >= PAGE_SIZE)
-		return -ENOMEM;
-
-	/* No partial writes. */
-	if (*ppos != 0)
-		return -EINVAL;
-
-	page = memdup_user_nul(buf, count);
-	if (IS_ERR(page))
-		return PTR_ERR(page);
-
-	if (sscanf(page, "%d", &new_value) != 1) {
-		length = -EINVAL;
-		goto out;
-	}
-	length = count;
-
-	if (new_value) {
-		pr_err("SELinux: https://github.com/SELinuxProject/selinux-kernel/wiki/DEPRECATE-runtime-disable\n");
-		pr_err("SELinux: Runtime disable is not supported, use selinux=0 on the kernel cmdline.\n");
-	}
-
-out:
-	kfree(page);
-	return length;
+	/*
+	 * Setting disable is no longer supported, see
+	 * https://github.com/SELinuxProject/selinux-kernel/wiki/DEPRECATE-runtime-disable
+	 */
+	pr_err_once("SELinux: %s (%d) wrote to disable. This is no longer supported.\n",
+		    current->comm, current->pid);
+	return count;
 }
 
 static const struct file_operations sel_disable_ops = {