linux-kernel - Re: [PATCH v3] net: vmw_vsock: vmci: Check memcpy_from

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Date:   Tue, 6 Dec 2022 09:52:33 +0300
From:   Artem Chernyshev <artem.chernyshev@...-soft.ru>
To:     Vishnu Dasa <vdasa@...are.com>
Cc:     Stefano Garzarella <sgarzare@...hat.com>,
        Pv-drivers <Pv-drivers@...are.com>,
        Bryan Tan <bryantan@...are.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux Virtualization <virtualization@...ts.linux-foundation.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "lvc-project@...uxtesting.org" <lvc-project@...uxtesting.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH v3] net: vmw_vsock: vmci: Check memcpy_from_msg()

Hi,
On Mon, Dec 05, 2022 at 11:03:47PM +0000, Vishnu Dasa wrote:
> 
> > On Dec 5, 2022, at 3:52 AM, Artem Chernyshev <artem.chernyshev@...-soft.ru> wrote:
> > 
> > vmci_transport_dgram_enqueue() does not check the return value
> > of memcpy_from_msg(). Return with an error if the memcpy fails.
> 
> I think we can add some more information in the description.  Sorry, I
> should've said this earlier.
> 
> vmci_transport_dgram_enqueue() does not check the return value
> of memcpy_from_msg().  If memcpy_from_msg() fails, it is possible that
> uninitialized memory contents are sent unintentionally instead of user's
> message in the datagram to the destination.  Return with an error if
> memcpy_from_msg() fails.
> 
> > 
> > Found by Linux Verification Center (linuxtesting.org) with SVACE.
> > 
> > Fixes: 0f7db23a07af ("vmci_transport: switch ->enqeue_dgram, ->enqueue_stream and ->dequeue_stream to msghdr")
> > Signed-off-by: Artem Chernyshev <artem.chernyshev@...-soft.ru>
> 
> Thanks, Artem!  This version looks good to me modulo my suggestion
> about the description above.
> 
> Reviewed-by: Vishnu Dasa <vdasa@...are.com>
> 
> Regards,
> Vishnu
> 
No problem, I'll change description in v4

Thanks,
Artem