linux-kernel - [PATCH v2 2/2] tty: check tcsetpgrp p is a process group

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Date:	Sat, 27 Jun 2015 20:51:29 -0400
From:	Patrick Donnelly <batrick@...bytes.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	linux-kernel@...r.kernel.org (open list)
Cc:	Patrick Donnelly <batrick@...bytes.com>
Subject: [PATCH v2 2/2] tty: check tcsetpgrp p is a process group

This fixes a bug where a process can set the foreground process group to its
pid even if its pid is not a valid pgrp.

Signed-off-by: Patrick Donnelly <batrick@...bytes.com>
---
 drivers/tty/tty_io.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index fbb55db..01b4769 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -2579,6 +2579,9 @@ static int tiocspgrp(struct tty_struct *tty, struct tty_struct *real_tty, pid_t
 	retval = -ESRCH;
 	if (!pgrp)
 		goto out_unlock;
+	retval = -EINVAL;
+	if (!pid_task(pgrp, PIDTYPE_PGID))
+		goto out_unlock;
 	retval = -EPERM;
 	if (session_of_pgrp(pgrp) != task_session(current))
 		goto out_unlock;
-- 
Patrick Donnelly

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