linux-kernel - Re: [PATCH v5 6/6] module: Move duplicate mod_check_sig users code to mod_parse

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Date:   Tue, 25 Jan 2022 12:27:13 -0800
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Michal Suchanek <msuchanek@...e.de>
Cc:     keyrings@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-integrity@...r.kernel.org, kexec@...ts.infradead.org,
        Philipp Rudo <prudo@...hat.com>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        Nayna <nayna@...ux.vnet.ibm.com>, Rob Herring <robh@...nel.org>,
        linux-s390@...r.kernel.org, Vasily Gorbik <gor@...ux.ibm.com>,
        Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Jessica Yu <jeyu@...nel.org>, linux-kernel@...r.kernel.org,
        David Howells <dhowells@...hat.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Paul Mackerras <paulus@...ba.org>,
        Hari Bathini <hbathini@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        linuxppc-dev@...ts.ozlabs.org,
        Frank van der Linden <fllinden@...zon.com>,
        Thiago Jung Bauermann <bauerman@...ux.ibm.com>,
        Daniel Axtens <dja@...ens.net>, buendgen@...ibm.com,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Baoquan He <bhe@...hat.com>,
        linux-security-module@...r.kernel.org
Subject: Re: [PATCH v5 6/6] module: Move duplicate mod_check_sig users code
 to mod_parse_sig

On Tue, Jan 11, 2022 at 12:37:48PM +0100, Michal Suchanek wrote:
> Multiple users of mod_check_sig check for the marker, then call
> mod_check_sig, extract signature length, and remove the signature.
> 
> Put this code in one place together with mod_check_sig.
> 
> This changes the error from ENOENT to ENODATA for ima_read_modsig in the
> case the signature marker is missing.
> 
> This also changes the buffer length in ima_read_modsig from size_t to
> unsigned long. This reduces the possible value range on 32bit but the
> length refers to kernel in-memory buffer which cannot be longer than
> ULONG_MAX.
> 
> Also change mod_check_sig to unsigned long while at it.
> 
> Signed-off-by: Michal Suchanek <msuchanek@...e.de>

Reviewed-by: Luis Chamberlain <mcgrof@...nel.org>

  Luis