linux-kernel - Re: [PATCH] VDUSE: avoid leaking information to userspace

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Message-ID: <CACycT3tVT5x3hoDrtuzqMgLgmw_1JbDtQwwJQ2o4mV2xUkFc9w@mail.gmail.com>
Date: Fri, 30 Jan 2026 14:41:05 +0800
From: Yongji Xie <xieyongji@...edance.com>
To: Jason Wang <jasowang@...hat.com>
Cc: "Michael S. Tsirkin" <mst@...hat.com>, virtualization@...ts.linux.dev, 
	linux-kernel <linux-kernel@...r.kernel.org>, Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, 
	Eugenio Perez Martin <eperezma@...hat.com>, stable@...r.kernel.org
Subject: Re: [PATCH] VDUSE: avoid leaking information to userspace

On Fri, Jan 30, 2026 at 1:08 PM Jason Wang <jasowang@...hat.com> wrote:
>
> The bounceing is not necessarily page aligned, so current VDUSE can
> leak kernel information through mapping bounce pages to
> userspace. Allocate bounce pages with __GFP_ZERO to avoid leaking
> information to userspace.
>
> Fixes: 8c773d53fb7b ("vduse: Implement an MMU-based software IOTLB")
> Cc: stable@...r.kernel.org
> Signed-off-by: Jason Wang <jasowang@...hat.com>

Thanks for catching this!

Reviewed-by: Xie Yongji <xieyongji@...edance.com>

Thanks,
Yongji