linux-kernel - Re: [PATCH] tpm: fix a race condition tpm2_unseal

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Date:   Thu, 25 Aug 2016 12:30:59 -0600
From:   Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     Peter Huewe <peterhuewe@....de>,
        linux-security-module@...r.kernel.org, stable@...r.kernel.org,
        Marcel Selhorst <tpmdd@...horst.net>,
        "moderated list:TPM DEVICE DRIVER" 
        <tpmdd-devel@...ts.sourceforge.net>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tpm: fix a race condition tpm2_unseal_trusted()

On Tue, Aug 23, 2016 at 08:57:22PM -0400, Jarkko Sakkinen wrote:

> +     if (flags & TPM_TRANSMIT_LOCK)
> +             mutex_lock(&chip->tpm_mutex);

I think I would invert this. UNLOCKED is the exceptional case, so I'd
make the 0 flags lock. If we see UNLOCKED in the caller then we know
to audit for locking, 0 is much less obvious.

> @@ -576,7 +576,7 @@ static int tpm2_load(struct tpm_chip *chip,
>  		goto out;
>  	}
>  
> -	rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, "loading blob");
> +	rc = __tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, "loading blob", 0);

All these points should accept a flags too and the caller should pass
in the TPM_TRASNMIT_UNLOCKED if it needs it..

> +	mutex_lock(&chip->tpm_mutex);
>  	rc = tpm2_load(chip, payload, options, &blob_handle);
>  	if (rc)

So when we read here we see the pattern:

> +	mutex_lock(&chip->tpm_mutex);
>  	rc = tpm2_load(chip, payload, options, &blob_handle, TPM_TRASNMIT_UNLOCKED);

Which is much easier to audit..

Jason