linux-kernel - Re: [PATCH V2 1/1] Drivers: hv: Implement the file copy service

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Date:	Tue, 14 Jan 2014 23:13:23 +0100
From:	Olaf Hering <olaf@...fle.de>
To:	"K. Y. Srinivasan" <kys@...rosoft.com>
Cc:	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, apw@...onical.com,
	jasowang@...hat.com
Subject: Re: [PATCH V2 1/1] Drivers: hv: Implement the file copy service

On Tue, Jan 14, K. Y. Srinivasan wrote:


> +static ssize_t fcopy_write(struct file *file, const char __user *buf,
> +			size_t count, loff_t *ppos)
> +{
> +	int error = 0;
> +
> +	if (count != sizeof(int))
> +		return 0;
> +
> +	if (copy_from_user(&error, buf, sizeof(int)))
> +		return -EFAULT;
> +
> +	if (in_hand_shake) {
> +		fcopy_handle_handshake();
> +		return 0;
> +	}


> +	/*
> +	 * Register with the kernel.
> +	 */
> +	write(fcopy_fd, &version, sizeof(int));


Shouldnt there be some version check already even in this initial
implementation? What if there will be a newer daemon running on an older
kernel?

Olaf
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