linux-kernel - Re: [PATCH v2] x86/xen: allow userspace access during hypercalls

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Message-ID: <664ecd67-8bd5-3efd-4b59-eef79640ef4c@suse.com>
Date:   Mon, 26 Jun 2017 14:54:07 +0200
From:   Juergen Groß <jgross@...e.com>
To:     Marek Marczykowski-Górecki 
        <marmarek@...isiblethingslab.com>, xen-devel@...ts.xenproject.org
Cc:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Andrew Cooper <andrew.cooper3@...rix.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v2] x86/xen: allow userspace access during hypercalls

On 06/26/2017 02:49 PM, Marek Marczykowski-Górecki wrote:
> Userspace application can do a hypercall through /dev/xen/privcmd, and
> some for some hypercalls argument is a pointers to user-provided
> structure. When SMAP is supported and enabled, hypervisor can't access.
> So, lets allow it.
> 
> The same applies to HYPERVISOR_dm_op, where additionally privcmd driver
> carefully verify buffer addresses.
> 
> Cc: stable@...r.kernel.org
> Signed-off-by: Marek Marczykowski-Górecki <marmarek@...isiblethingslab.com>

Reviewed-by: Juergen Gross <jgross@...e.com>


Thanks,

Juergen