linux-kernel - Re: [PATCH] tpm: ibmvtpm: Avoid -EINTR error when IMA talks to TPM

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Date:   Fri, 12 Feb 2021 17:32:14 -0500
From:   Stefan Berger <stefanb@...ux.ibm.com>
To:     Jarkko Sakkinen <jarkko@...nel.org>
Cc:     linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        peterhuewe@....de, Nayna Jain <nayna@...ux.ibm.com>,
        George Wilson <gcwilson@...ux.ibm.com>
Subject: Re: [PATCH] tpm: ibmvtpm: Avoid -EINTR error when IMA talks to TPM

On 2/12/21 4:05 AM, Jarkko Sakkinen wrote:
> On Tue, Feb 09, 2021 at 05:13:39PM -0500, Stefan Berger wrote:
>> When IMA is taking measurements during compilation for example and a
>> user presses ctrl-c to abort the compilation, lots of these types of
>> messages will appear in the kernel log:
>>
>> [ 7406.275163] tpm tpm0: tpm_transmit: tpm_recv: error -4
>> [ 7406.275242] ima: Error Communicating to TPM chip, result: -4
>>
>> The issue is caused by the fact that the IBM vTPM driver's recv()
>> function is called immediately after send() without waiting for
>> status on whether a response was received. It currently waits for
>> the current command to finish using this call that ends up throwing
>> these error messages because it is 'interruptible':
> Why it is an issue?


The issue is the many kernel log entries we get when someone interrupts 
an application with ctrl-c while IMA is taking measurements of files it 
reads.I thought that was clear from the first paragraph.