1 files changed, 74 insertions, 0 deletions

diff --git a/drivers/tty/tty_ioctl.c b/drivers/tty/tty_ioctl.c
index 31d11230e778..026429276637 100644
--- a/drivers/tty/tty_ioctl.c
+++ b/drivers/tty/tty_ioctl.c
@@ -374,6 +374,80 @@ int tty_set_termios(struct tty_struct *tty, struct ktermios *new_termios)
 }
 EXPORT_SYMBOL_GPL(tty_set_termios);
 
+
+/*
+ * Translate a "termio" structure into a "termios". Ugh.
+ */
+__weak int user_termio_to_kernel_termios(struct ktermios *termios,
+						struct termio __user *termio)
+{
+	struct termio v;
+
+	if (copy_from_user(&v, termio, sizeof(struct termio)))
+		return -EFAULT;
+
+	termios->c_iflag = (0xffff0000 & termios->c_iflag) | v.c_iflag;
+	termios->c_oflag = (0xffff0000 & termios->c_oflag) | v.c_oflag;
+	termios->c_cflag = (0xffff0000 & termios->c_cflag) | v.c_cflag;
+	termios->c_lflag = (0xffff0000 & termios->c_lflag) | v.c_lflag;
+	termios->c_line = (0xffff0000 & termios->c_lflag) | v.c_line;
+	memcpy(termios->c_cc, v.c_cc, NCC);
+	return 0;
+}
+
+/*
+ * Translate a "termios" structure into a "termio". Ugh.
+ */
+__weak int kernel_termios_to_user_termio(struct termio __user *termio,
+						struct ktermios *termios)
+{
+	struct termio v;
+	memset(&v, 0, sizeof(struct termio));
+	v.c_iflag = termios->c_iflag;
+	v.c_oflag = termios->c_oflag;
+	v.c_cflag = termios->c_cflag;
+	v.c_lflag = termios->c_lflag;
+	v.c_line = termios->c_line;
+	memcpy(v.c_cc, termios->c_cc, NCC);
+	return copy_to_user(termio, &v, sizeof(struct termio));
+}
+
+#ifdef TCGETS2
+__weak int user_termios_to_kernel_termios(struct ktermios *k,
+						 struct termios2 __user *u)
+{
+	return copy_from_user(k, u, sizeof(struct termios2));
+}
+__weak int kernel_termios_to_user_termios(struct termios2 __user *u,
+						 struct ktermios *k)
+{
+	return copy_to_user(u, k, sizeof(struct termios2));
+}
+__weak int user_termios_to_kernel_termios_1(struct ktermios *k,
+						   struct termios __user *u)
+{
+	return copy_from_user(k, u, sizeof(struct termios));
+}
+__weak int kernel_termios_to_user_termios_1(struct termios __user *u,
+						   struct ktermios *k)
+{
+	return copy_to_user(u, k, sizeof(struct termios));
+}
+
+#else
+
+__weak int user_termios_to_kernel_termios(struct ktermios *k,
+						 struct termios __user *u)
+{
+	return copy_from_user(k, u, sizeof(struct termios));
+}
+__weak int kernel_termios_to_user_termios(struct termios __user *u,
+						 struct ktermios *k)
+{
+	return copy_to_user(u, k, sizeof(struct termios));
+}
+#endif /* TCGETS2 */
+
 /**
  *	set_termios		-	set termios values for a tty
  *	@tty: terminal device