[PATCH] tty: Only allow slave pty as controlling tty

From	Peter Hurley <peter@hurleysoftware.com>
Newsgroups	linux.kernel
Subject	[PATCH] tty: Only allow slave pty as controlling tty
Date	2015-11-08 15:10 +0100
Message-ID	<qsyPn-18x-7@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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A master pty should never be a controlling tty in Linux; if the
master pty is specified to ioctl(TIOCSCTTY), silently substitute the slave
pty as the controlling tty.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
---
 drivers/tty/tty_io.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 9fa5a4f..2f9c1c6 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -2862,7 +2862,7 @@ long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 		no_tty();
 		return 0;
 	case TIOCSCTTY:
-		return tiocsctty(tty, file, arg);
+		return tiocsctty(real_tty, file, arg);
 	case TIOCGPGRP:
 		return tiocgpgrp(tty, real_tty, p);
 	case TIOCSPGRP:
-- 
2.6.3

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[PATCH] tty: Only allow slave pty as controlling tty Peter Hurley <peter@hurleysoftware.com> - 2015-11-08 15:10 +0100

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