netdev - Re: [PATCH net 1/1] i40e: fix PTP pins verification

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Date:   Wed, 26 Apr 2023 06:52:46 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     Tony Nguyen <anthony.l.nguyen@...el.com>, davem@...emloft.net,
        kuba@...nel.org, pabeni@...hat.com, edumazet@...gle.com,
        netdev@...r.kernel.org, Andrii Staikov <andrii.staikov@...el.com>,
        Sunitha Mekala <sunithax.d.mekala@...el.com>
Subject: Re: [PATCH net 1/1] i40e: fix PTP pins verification

On Wed, Apr 26, 2023 at 10:18:12AM +0300, Leon Romanovsky wrote:
> On Tue, Apr 25, 2023 at 10:04:06AM -0700, Tony Nguyen wrote:
> > From: Andrii Staikov <andrii.staikov@...el.com>
> > 
> > Fix PTP pins verification not to contain tainted arguments. As a new PTP
> > pins configuration is provided by a user, it may contain tainted
> > arguments that are out of bounds for the list of possible values that can
> > lead to a potential security threat. Change pin's state name from 'invalid'
> > to 'empty' for more clarification.
> 
> And why isn't this handled in upper layer which responsible to get
> user input?

It is.

long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
{
	...

	switch (cmd) {

	case PTP_PIN_SETFUNC:
	case PTP_PIN_SETFUNC2:
		if (copy_from_user(&pd, (void __user *)arg, sizeof(pd))) {
			err = -EFAULT;
			break;
		}
		...

		pin_index = pd.index;
		if (pin_index >= ops->n_pins) {
			err = -EINVAL;
			break;
		}

		...
	}
	...
}