linux-kernel - Re: [PATCH 1/2] tpm: Fix error handling in async work

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Message-ID: <Ycu8+gKE6dA9Jv1e@iki.fi>
Date:   Wed, 29 Dec 2021 03:42:18 +0200
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Tadeusz Struk <tstruk@...il.com>
Cc:     Jason Gunthorpe <jgg@...pe.ca>, linux-integrity@...r.kernel.org,
        stable@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] tpm: Fix error handling in async work

On Tue, Dec 28, 2021 at 04:08:42PM -0800, Tadeusz Struk wrote:
> On 12/28/21 15:47, Jarkko Sakkinen wrote:
> > > When an invalid (non existing) handle is used in a tpm command,
> > > that uses the resource manager interface (/dev/tpmrm0) the resource
> > > manager tries to load it from its internal cache, but fails and
> > > returns an -EINVAL error to the caller. The existing async handler
> > > doesn't handle these error cases currently and the condition in the
> > > poll handler never returns mask with EPOLLIN set causing the userspace
> > > code to get stack. Make sure that error conditions also contribute
> > > to the poll mask so that a correct error code could passed back
> > > to the caller.
> > Can you instead describe a failure scenario? This is very cryptic.
> 
> The problem is that the poll call blocks and the application gets stuck
> until the tpm_timeout_work() wakes it up after 120 sec (jiffies + (120 * HZ)).
> I will update the description, fix all the typos, and resend it.
> 
> Thanks,
> Tadeusz

OK, great, thank you.

BR,
Jarkko