linux-kernel - Re: [PATCH v9 0/8] powerpc: Enabling IMA arch specific secure boot policies

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Date:   Mon, 28 Oct 2019 08:10:43 -0400
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Nayna Jain <nayna@...ux.ibm.com>, linuxppc-dev@...abs.org,
        linux-efi@...r.kernel.org, linux-integrity@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Jeremy Kerr <jk@...abs.org>,
        Matthew Garret <matthew.garret@...ula.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Claudio Carvalho <cclaudio@...ux.ibm.com>,
        George Wilson <gcwilson@...ux.ibm.com>,
        Elaine Palmer <erpalmer@...ibm.com>,
        Eric Ricther <erichte@...ux.ibm.com>,
        "Oliver O'Halloran" <oohall@...il.com>,
        Prakhar Srivastava <prsriva02@...il.com>,
        Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
Subject: Re: [PATCH v9 0/8] powerpc: Enabling IMA arch specific secure boot
 policies

On Wed, 2019-10-23 at 22:47 -0500, Nayna Jain wrote:
> This patchset extends the previous version[1] by adding support for
> checking against a blacklist of binary hashes.
> 
> The IMA subsystem supports custom, built-in, arch-specific policies to
> define the files to be measured and appraised. These policies are honored
> based on priority, where arch-specific policy is the highest and custom
> is the lowest.
> 
> PowerNV system uses a Linux-based bootloader to kexec the OS. The
> bootloader kernel relies on IMA for signature verification of the OS
> kernel before doing the kexec. This patchset adds support for powerpc
> arch-specific IMA policies that are conditionally defined based on a
> system's secure boot and trusted boot states. The OS secure boot and
> trusted boot states are determined via device-tree properties.
> 
> The verification needs to be performed only for binaries that are not
> blacklisted. The kernel currently only checks against the blacklist of
> keys. However, doing so results in blacklisting all the binaries that
> are signed by the same key. In order to prevent just one particular
> binary from being loaded, it must be checked against a blacklist of
> binary hashes. This patchset also adds support to IMA for checking
> against a hash blacklist for files. signed by appended signature.
> 
> [1] http://patchwork.ozlabs.org/cover/1149262/ 

Thanks, Nayna.

Please feel free to add my Signed-off-by tag on patches (2, 4, 5, 7 &
8).

thanks,

Mimi