linux-kernel - Re: [PATCH v5 21/21] tpm: use u32 instead of int for PCR index

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Date:   Tue, 2 Oct 2018 03:58:37 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Tomas Winkler <tomas.winkler@...el.com>
Cc:     Jason Gunthorpe <jgg@...pe.ca>,
        Nayna Jain <nayna@...ux.vnet.ibm.com>,
        Alexander Usyskin <alexander.usyskin@...el.com>,
        Tadeusz Struk <tadeusz.struk@...el.com>,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 21/21] tpm: use u32 instead of int for PCR index

On Sat, Sep 29, 2018 at 01:30:35AM +0300, Tomas Winkler wrote:
> The TPM specs defines PCR index as a positive number, and there is
> no reason to use a signed number. It is also a possible security
> issue as currently no functions check for a negative index,
> which may become a large number when converted to u32.
> 
> Adjust the API to use u32 instead of int in all PCR related
> functions.
> 
> Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>

Tested-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>

/Jarkko