linux-kernel - Re: [PATCH] tpm/eventlog: Don't abort tpm_read

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] [day] [month] [year] [list]

Message-ID: <Yz3yFxZ+qj2Qz4az@kernel.org>
Date:   Thu, 6 Oct 2022 00:07:35 +0300
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Morten Linderud <morten@...derud.pw>
Cc:     Peter Huewe <peterhuewe@....de>, Jason Gunthorpe <jgg@...pe.ca>,
        Stefan Berger <stefanb@...ux.ibm.com>,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        Oleksandr Natalenko <oleksandr@...alenko.name>
Subject: Re: [PATCH] tpm/eventlog: Don't abort tpm_read_log on faulty ACPI
 config

On Wed, Oct 05, 2022 at 11:31:28AM +0200, Morten Linderud wrote:
> On Wed, Oct 05, 2022 at 01:40:09AM +0300, Jarkko Sakkinen wrote:
> > On Mon, Sep 20, 2021 at 10:34:47PM +0200, Morten Linderud wrote:
> > > Some vendors report faulty values in the acpi TPM2 table. This causes
> > 
> > s/acpi/ACPI/
> > 
> > > the function to abort with EIO and essentially short circuits the
> > 
> > s/the function/tpm_read_log()/
> > 
> > > tpm_read_log function as we never even attempt to read the EFI
> > > configuration table for a log.
> > 
> > > 
> > > This changes the condition to only look for a positive return value,
> > > else hands over the eventlog discovery to the EFI configuration table
> > > which should hopefully work better.
> > 
> > Please, write in imperative ("Change...").
> > 
> > Also exlicitly state how are you changing the check for
> > tpm_read_log_acpi() in tpm_read_log().
> > 
> > You could *even* have a snippet how the checks change
> > here for clarity.
> > 
> > > It's unclear to me if there is a better solution to this then just
> > > failing. However, I do not see any clear reason why we can't properly
> > > fallback to the EFI configuration table.
> > 
> > This paragraph should not be part of the commit message.
> > 
> > Rest of the commit message made sense can you add also fixes tag
> > as this is clearly a bug fix?
> > 
> > Also, please remove the two spurious diff's from the commit that
> > are not relevant for a stable bug fix (pr_warn() and comment
> > removal).
> 
> Yo,
> 
> This is the v1 of the patch which you reviewed a year ago.
> https://marc.info/?l=linux-integrity&m=163225066613340&w=2
> 
> V2 mostly fixed the commit message, but there where some more pointers. I'm
> happy to submit a V3 if we can agree on all the details.
> 
> V2 review is here:
> https://marc.info/?l=linux-integrity&m=165475008823837&w=2

Send v3 with fixes tag and it is fine.

BR, Jarkko