linux-kernel - Re: [Regression] "tpm: Require that all digests are present in TCG_PCR_EVENT2 structures" causes null pointer dereference

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Message-ID: <alpine.DEB.2.23.453.2009281104310.3261@xps-7390>
Date:   Mon, 28 Sep 2020 11:05:39 -0700 (PDT)
From:   "Kenneth R. Crudup" <kenny@...ix.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
cc:     Ard Biesheuvel <ardb@...nel.org>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Tyler Hicks <tyhicks@...ux.microsoft.com>,
        linux-integrity <linux-integrity@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Matthew Garrett <mjg59@...gle.com>, tweek@...gle.com
Subject: Re: [Regression] "tpm: Require that all digests are present in
 TCG_PCR_EVENT2 structures" causes null pointer dereference


On Mon, 28 Sep 2020, Jarkko Sakkinen wrote:

> That's a good guess. Just a bit confused how that particular patch can
> have the effect: it has two deferences to efispecid instead of one in
> the same statement. Would be interesting to hear if the bug is triggered
> in Kenneth's environment by the exact same commit.

I can confirm that reverting 7f3d176f5f stops my kernel from panic()ing:

$ sudo fwupdtpmevlog
[sudo] password for kenny:
Failed to parse file: attempted to read 0x10 bytes from buffer of 0x00
$

It would normally OOPS at that point.

	-Kenny

-- 
Kenneth R. Crudup  Sr. SW Engineer, Scott County Consulting, Orange County CA