linux-kernel - [PATCH v2 01/24] Input: input_event: fix struct padding on sparc64

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Message-Id: <20191213204936.3643476-2-arnd@arndb.de>
Date:   Fri, 13 Dec 2019 21:49:10 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     y2038@...ts.linaro.org, linux-kernel@...r.kernel.org,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Deepa Dinamani <deepa.kernel@...il.com>
Cc:     Arnd Bergmann <arnd@...db.de>, sparclinux@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>, stable@...r.kernel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lubomir Rintel <lkundrak@...sk>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-input@...r.kernel.org
Subject: [PATCH v2 01/24] Input: input_event: fix struct padding on sparc64

Going through all uses of timeval, I noticed that we screwed up
input_event in the previous attempts to fix it:

The time fields now match between kernel and user space, but
all following fields are in the wrong place.

Add the required padding that is implied by the glibc timeval
definition to fix the layout, and use a struct initializer
to avoid leaking kernel stack data.

Cc: sparclinux@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>
Fixes: 141e5dcaa735 ("Input: input_event - fix the CONFIG_SPARC64 mixup")
Fixes: 2e746942ebac ("Input: input_event - provide override for sparc64")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/input/evdev.c       | 14 +++++++-------
 drivers/input/misc/uinput.c | 14 +++++++++-----
 include/uapi/linux/input.h  |  1 +
 3 files changed, 17 insertions(+), 12 deletions(-)

diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index d7dd6fcf2db0..f918fca9ada3 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -224,13 +224,13 @@ static void __pass_event(struct evdev_client *client,
 		 */
 		client->tail = (client->head - 2) & (client->bufsize - 1);
 
-		client->buffer[client->tail].input_event_sec =
-						event->input_event_sec;
-		client->buffer[client->tail].input_event_usec =
-						event->input_event_usec;
-		client->buffer[client->tail].type = EV_SYN;
-		client->buffer[client->tail].code = SYN_DROPPED;
-		client->buffer[client->tail].value = 0;
+		client->buffer[client->tail] = (struct input_event) {
+			.input_event_sec = event->input_event_sec,
+			.input_event_usec = event->input_event_usec,
+			.type = EV_SYN,
+			.code = SYN_DROPPED,
+			.value = 0,
+		};
 
 		client->packet_head = client->tail;
 	}
diff --git a/drivers/input/misc/uinput.c b/drivers/input/misc/uinput.c
index fd253781be71..2dabbe47d43e 100644
--- a/drivers/input/misc/uinput.c
+++ b/drivers/input/misc/uinput.c
@@ -74,12 +74,16 @@ static int uinput_dev_event(struct input_dev *dev,
 	struct uinput_device	*udev = input_get_drvdata(dev);
 	struct timespec64	ts;
 
-	udev->buff[udev->head].type = type;
-	udev->buff[udev->head].code = code;
-	udev->buff[udev->head].value = value;
 	ktime_get_ts64(&ts);
-	udev->buff[udev->head].input_event_sec = ts.tv_sec;
-	udev->buff[udev->head].input_event_usec = ts.tv_nsec / NSEC_PER_USEC;
+
+	udev->buff[udev->head] = (struct input_event) {
+		.input_event_sec = ts.tv_sec,
+		.input_event_usec = ts.tv_nsec / NSEC_PER_USEC,
+		.type = type,
+		.code = code,
+		.value = value,
+	};
+
 	udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE;
 
 	wake_up_interruptible(&udev->waitq);
diff --git a/include/uapi/linux/input.h b/include/uapi/linux/input.h
index f056b2a00d5c..9a61c28ed3ae 100644
--- a/include/uapi/linux/input.h
+++ b/include/uapi/linux/input.h
@@ -34,6 +34,7 @@ struct input_event {
 	__kernel_ulong_t __sec;
 #if defined(__sparc__) && defined(__arch64__)
 	unsigned int __usec;
+	unsigned int __pad;
 #else
 	__kernel_ulong_t __usec;
 #endif
-- 
2.20.0