linux-kernel - [PATCH v2 01/15] tty: audit: Early-out pty master reads earlier

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Message-Id: <1452408939-19380-2-git-send-email-peter@hurleysoftware.com>
Date:	Sat,  9 Jan 2016 22:55:25 -0800
From:	Peter Hurley <peter@...leysoftware.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Jiri Slaby <jslaby@...e.cz>, linux-kernel@...r.kernel.org,
	Peter Hurley <peter@...leysoftware.com>
Subject: [PATCH v2 01/15] tty: audit: Early-out pty master reads earlier

Reads from pty masters are not logged; early-out before taking
locks.

Signed-off-by: Peter Hurley <peter@...leysoftware.com>
---
 drivers/tty/tty_audit.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/tty/tty_audit.c b/drivers/tty/tty_audit.c
index 3d245cd..ead924e 100644
--- a/drivers/tty/tty_audit.c
+++ b/drivers/tty/tty_audit.c
@@ -276,16 +276,16 @@ void tty_audit_add_data(struct tty_struct *tty, const void *data,
 	if (unlikely(size == 0))
 		return;
 
+	if (tty->driver->type == TTY_DRIVER_TYPE_PTY
+	    && tty->driver->subtype == PTY_TYPE_MASTER)
+		return;
+
 	spin_lock_irqsave(&current->sighand->siglock, flags);
 	audit_log_tty_passwd = current->signal->audit_tty_log_passwd;
 	spin_unlock_irqrestore(&current->sighand->siglock, flags);
 	if (!audit_log_tty_passwd && icanon && !L_ECHO(tty))
 		return;
 
-	if (tty->driver->type == TTY_DRIVER_TYPE_PTY
-	    && tty->driver->subtype == PTY_TYPE_MASTER)
-		return;
-
 	buf = tty_audit_buf_get(tty, icanon);
 	if (!buf)
 		return;
-- 
2.7.0