linux-kernel - Re: [PATCH v6 5/9] tpm, tpm_tis: Only handle supported interrupts

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Sun, 26 Jun 2022 14:18:17 +0200
From:   Lino Sanfilippo <LinoSanfilippo@....de>
To:     Jarkko Sakkinen <jarkko@...nel.org>
Cc:     peterhuewe@....de, jgg@...pe.ca, stefanb@...ux.vnet.ibm.com,
        linux@...ewoehner.de, linux-integrity@...r.kernel.org,
        linux-kernel@...r.kernel.org, l.sanfilippo@...bus.com,
        lukas@...ner.de, p.rosenberger@...bus.com
Subject: Re: [PATCH v6 5/9] tpm, tpm_tis: Only handle supported interrupts

On 26.06.22 at 08:40, Jarkko Sakkinen wrote:
>
> I would instead mask out bits and write a helper function
> taking care of this:
>
> static u8 tpm_tis_filter_sts_mask(u8 int_mask, u8 sts_mask)
> {
>         struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
>
>         if (!(int_mask & TPM_INTF_STS_VALID_INT))
>                 sts_mask &= ~TPM_STS_VALID;
>
>         if (!(int_mask & TPM_INTF_DATA_AVAIL_INT))
>                 sts_mask &= ~TPM_STS_DATA_AVAIL;
>
>         if (!(int_mask & TPM_INTF_CMD_READY_INT))
> 		sts_mask &= ~TPM_STS_COMMAND_READY;
>
>         return sts_mask;
> }
>
> Less operations and imho somewhat cleaner structure.
>
> Add suggested-by if you want.

I thought of a helper like this before but then decided to
not introduce another function to keep the code changes minimal. But yes,
it is indeed cleaner. I will do the change and resubmit the series.

Thanks for the review!

Regards,
Lino