linux-kernel - Re: [PATCH v4 21/21] tpm: use u32 instead of int for PCR index

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Message-ID: <c08ed1def2ba28c3a44291b0652dd7f8830de1f4.camel@linux.intel.com>
Date:   Tue, 25 Sep 2018 17:41:52 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Tomas Winkler <tomas.winkler@...el.com>,
        Jason Gunthorpe <jgg@...pe.ca>
Cc:     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 v4 21/21] tpm: use u32 instead of int for PCR index

On Fri, 2018-09-21 at 16:58 +0300, Tomas Winkler wrote:
> The TPM specs defines PCR index a positive number, there is
> no reason to use a signed number and it's also a possible security
> issue as currently no functions check for a negative index,
> which my into 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>

I think I barked something about this in prev version but after giving
some thought. I think this a good change (more exact API).

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

/Jarkko