From: Wei Liu <wei.liu@kernel.org>
To: Yousef Alhouseen <alhouseenyousef@gmail.com>
Cc: "K . Y . Srinivasan" <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Wei Liu <wei.liu@kernel.org>, Dexuan Cui <decui@microsoft.com>,
Long Li <longli@microsoft.com>,
Michael Kelley <mhklinux@outlook.com>,
linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] mshv_vtl: clear hypercall output before copyout
Date: Wed, 22 Jul 2026 15:07:01 -0700 [thread overview]
Message-ID: <20260722220701.GD2020652@liuwe-devbox-debian-v2.local> (raw)
In-Reply-To: <20260625181314.1399-1-alhouseenyousef@gmail.com>
On Thu, Jun 25, 2026 at 08:13:14PM +0200, Yousef Alhouseen wrote:
> mshv_vtl_hvcall_call() copies output_size bytes to userspace.
>
> The output page is freshly allocated. Userspace chooses the copyout length.
>
> If the hypercall writes less, the tail can contain stale page data.
>
> Clear the copied range before issuing the hypercall.
>
> Also check both bounce page allocations before either page is used.
>
> Signed-off-by: Yousef Alhouseen <alhouseenyousef@gmail.com>
Applied. Thanks.
prev parent reply other threads:[~2026-07-22 22:07 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-24 17:21 [PATCH] hyperv: mshv: zero VTL hypercall output page Yousef Alhouseen
2026-06-24 17:32 ` sashiko-bot
2026-06-25 16:41 ` Michael Kelley
2026-06-25 18:13 ` [PATCH v2] mshv_vtl: clear hypercall output before copyout Yousef Alhouseen
2026-06-25 18:22 ` Michael Kelley
2026-06-25 18:23 ` sashiko-bot
2026-07-22 22:07 ` Wei Liu [this message]
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