Re: [PATCH V2 1/3] kvm: use kmalloc() instead of kzalloc() during iodev register/unregister

From: Joe Perches
Date: Wed Aug 26 2015 - 01:45:56 EST

On Wed, 2015-08-26 at 13:39 +0800, Jason Wang wrote:
> On 08/25/2015 11:29 PM, Joe Perches wrote:
> > On Tue, 2015-08-25 at 15:47 +0800, Jason Wang wrote:
> >> > All fields of kvm_io_range were initialized or copied explicitly
> >> > afterwards. So switch to use kmalloc().
> > Is there any compiler added alignment padding
> > in either structure? If so, those padding
> > areas would now be uninitialized and may leak
> > kernel data if copied to user-space.
> >
> I get your concern, but I don't a way to copy them to userspace, did you?

I didn't look.

I just wanted you to be aware there's a difference
and a reason why kzalloc might be used even though
all structure members are initialized.

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