linux-kernel - [PATCH 0/2] powerpc/pseries: restrict error injection and DT changes when locked down

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Date:   Thu, 22 Sep 2022 14:38:15 -0500
From:   Nathan Lynch <nathanl@...ux.ibm.com>
To:     linuxppc-dev@...ts.ozlabs.org,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     jmorris@...ei.org, mpe@...erman.id.au, paul@...l-moore.com,
        serge@...lyn.com, ajd@...ux.ibm.com, gcwilson@...ux.ibm.com,
        nayna@...ux.ibm.com
Subject: [PATCH 0/2] powerpc/pseries: restrict error injection and DT changes when locked down

Add two new lockdown reasons for use in powerpc's pseries platform
code.

The pseries platform allows hardware-level error injection via certain
calls to the RTAS (Run Time Abstraction Services) firmware. ACPI-based
error injection is already restricted in lockdown; this facility
should be restricted for the same reasons.

pseries also allows nearly arbitrary device tree changes via
/proc/powerpc/ofdt. Just as overriding ACPI tables is not allowed
while locked down, so should this facility be restricted.

Nathan Lynch (2):
  powerpc/pseries: block untrusted device tree changes when locked down
  powerpc/rtas: block error injection when locked down

 arch/powerpc/kernel/rtas.c                | 25 ++++++++++++++++++++++-
 arch/powerpc/platforms/pseries/reconfig.c |  5 +++++
 include/linux/security.h                  |  2 ++
 security/security.c                       |  2 ++
 4 files changed, 33 insertions(+), 1 deletion(-)

-- 
2.37.3