On Fri, Sep 23, 2011 at 09:22:07AM +0300, Dan Carpenter wrote:
> Smatch has a new check for Rosenberg type information leaks where
> structs are copied to the user with uninitialized stack data in them.
>
> The issue here is that struct input_event_compat has a hole in it.
>
> struct input_event_compat {
> struct compat_timeval {
> } time; /* 0 0 */
>
> /* XXX 8 bytes hole, try to pack */
>
> short unsigned int type; /* 8 2 */
Hm, are you sure? 8-bytes is way too much. I'd expect type to be aligned
on 2-byte boundary, at least on x86_64...
>
>
> Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
>
> diff --git a/drivers/input/input-compat.c b/drivers/input/input-compat.c
> index e46a867..007850a 100644
> --- a/drivers/input/input-compat.c
> +++ b/drivers/input/input-compat.c
> @@ -44,6 +44,8 @@ int input_event_to_user(char __user *buffer,
> if (INPUT_COMPAT_TEST) {
> struct input_event_compat compat_event;
>
> + memset(&compat_event, 0, sizeof(compat_event));
> +
> compat_event.time.tv_sec = event->time.tv_sec;
> compat_event.time.tv_usec = event->time.tv_usec;
> compat_event.type = event->type;
--
Dmitry
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