| Message ID | 20191108203435.112759-9-arnd@arndb.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | y2038: bug fixes from y2038 work | expand |
Hi Arnd, On Fri, Nov 08, 2019 at 09:34:31PM +0100, Arnd Bergmann wrote: > 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 add explicit initialization > to avoid leaking kernel stack data. > > Cc: sparclinux@vger.kernel.org > Cc: "David S. Miller" <davem@davemloft.net> > Cc: stable@vger.kernel.org > 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@arndb.de> > --- > drivers/input/evdev.c | 3 +++ > drivers/input/misc/uinput.c | 3 +++ > include/uapi/linux/input.h | 1 + > 3 files changed, 7 insertions(+) > > diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c > index d7dd6fcf2db0..24a90793caf0 100644 > --- a/drivers/input/evdev.c > +++ b/drivers/input/evdev.c > @@ -228,6 +228,9 @@ static void __pass_event(struct evdev_client *client, > event->input_event_sec; > client->buffer[client->tail].input_event_usec = > event->input_event_usec; > +#ifdef CONFIG_SPARC64 > + client->buffer[client->tail].__pad = 0; > +#endif > client->buffer[client->tail].type = EV_SYN; > client->buffer[client->tail].code = SYN_DROPPED; > client->buffer[client->tail].value = 0; I do not like ifdefs here, do you think we could write: 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, }; to ensure all padded fields are initialized? This is not hot path as we do not expect queue to overfill too often. Thanks.
On Mon, Nov 11, 2019 at 7:28 PM Dmitry Torokhov <dmitry.torokhov@gmail.com> wrote: > I do not like ifdefs here, do you think we could write: > > 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, > }; > > to ensure all padded fields are initialized? This is not hot path as we > do not expect queue to overfill too often. Good idea, changed both instances now. Thanks for taking a look! Arnd
diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c index d7dd6fcf2db0..24a90793caf0 100644 --- a/drivers/input/evdev.c +++ b/drivers/input/evdev.c @@ -228,6 +228,9 @@ static void __pass_event(struct evdev_client *client, event->input_event_sec; client->buffer[client->tail].input_event_usec = event->input_event_usec; +#ifdef CONFIG_SPARC64 + client->buffer[client->tail].__pad = 0; +#endif client->buffer[client->tail].type = EV_SYN; client->buffer[client->tail].code = SYN_DROPPED; client->buffer[client->tail].value = 0; diff --git a/drivers/input/misc/uinput.c b/drivers/input/misc/uinput.c index 84051f20b18a..1d8c09e9fd47 100644 --- a/drivers/input/misc/uinput.c +++ b/drivers/input/misc/uinput.c @@ -80,6 +80,9 @@ static int uinput_dev_event(struct input_dev *dev, 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; +#ifdef CONFIG_SPARC64 + udev->buff[udev->head].__pad = 0; +#endif 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
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 add explicit initialization to avoid leaking kernel stack data. Cc: sparclinux@vger.kernel.org Cc: "David S. Miller" <davem@davemloft.net> Cc: stable@vger.kernel.org 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@arndb.de> --- drivers/input/evdev.c | 3 +++ drivers/input/misc/uinput.c | 3 +++ include/uapi/linux/input.h | 1 + 3 files changed, 7 insertions(+)