linux-kernel - Re: [PATCH v4 1/2] tpm: Fix error handling in async work

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Date:   Sun, 16 Jan 2022 16:34:06 +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 v4 1/2] tpm: Fix error handling in async work

On Sat, Jan 15, 2022 at 05:26:26PM -0800, Tadeusz Struk 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
> the tpm_dev_transmit 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.
> The result is that the poll call blocks and the application gets stuck
> until the user_read_timer wakes it up after 120 sec.
> Change the tpm_dev_async_work function to handle error conditions
> returned from tpm_dev_transmit they are also reflected in the poll mask
> and a correct error code could passed back to the caller.
> 
> Cc: Jarkko Sakkinen <jarkko@...nel.org>
> Cc: Jason Gunthorpe <jgg@...pe.ca>
> Cc: <linux-integrity@...r.kernel.org>
> Cc: <stable@...r.kernel.org>
> Cc: <linux-kernel@...r.kernel.org>
> 
> Fixes: 9e1b74a63f77 ("tpm: add support for nonblocking operation")
> Tested-by: Jarkko Sakkinen<jarkko@...nel.org>
> Signed-off-by: Tadeusz Struk <tstruk@...il.com>

Thank you.

Reviewed-by: Jarkko Sakkinen <jarkko@...nel.org>

BR, Jarkko