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

[Stefan Berger]

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.