linux-kernel - [Linux-kernel-mentees] [PATCH] firewire: Prevent kernel-infoleak in ioctl_get

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Message-Id: <20200727151537.315023-1-yepeilin.cs@gmail.com>
Date:   Mon, 27 Jul 2020 11:15:37 -0400
From:   Peilin Ye <yepeilin.cs@...il.com>
To:     Stefan Richter <stefanr@...6.in-berlin.de>
Cc:     Peilin Ye <yepeilin.cs@...il.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        linux1394-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: [Linux-kernel-mentees] [PATCH] firewire: Prevent kernel-infoleak in ioctl_get_info()

ioctl_get_info() is copying uninitialized stack memory to userspace due to
the compiler not initializing holes in statically allocated structures.
Fix it by initializing `event` using memset() in fill_bus_reset_event().

Cc: stable@...r.kernel.org
Suggested-by: Dan Carpenter <dan.carpenter@...cle.com>
Suggested-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Peilin Ye <yepeilin.cs@...il.com>
---
 drivers/firewire/core-cdev.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c
index fb6c651214f3..2341d762df5b 100644
--- a/drivers/firewire/core-cdev.c
+++ b/drivers/firewire/core-cdev.c
@@ -340,6 +340,8 @@ static void fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
 {
 	struct fw_card *card = client->device->card;
 
+	memset(event, 0, sizeof(*event));
+
 	spin_lock_irq(&card->lock);
 
 	event->closure	     = client->bus_reset_closure;
-- 
2.25.1