From 61f879d97ce4510dd29d676a20d67692e3b34806 Mon Sep 17 00:00:00 2001
From: Nayna Jain <nayna@linux.ibm.com>
Date: Wed, 15 Jul 2020 07:52:01 -0400
Subject: [PATCH] powerpc/pseries: Detect secure and trusted boot state of the
system.
References: jsc#SLE-15857 jsc#SLE-13618
Patch-mainline: v5.9-rc1
Git-commit: 61f879d97ce4510dd29d676a20d67692e3b34806
The device-tree properties to check secure and trusted boot state are
different for guests (pseries) compared to baremetal (powernv).
This patch updates the existing is_ppc_secureboot_enabled() and
is_ppc_trustedboot_enabled() functions to add support for pseries.
For pseries the secureboot and trustedboot state are exposed via
device-tree properties /ibm,secure-boot and /ibm,trusted-boot.
The values of ibm,secure-boot under pseries are interpreted as:
0 - Disabled
1 - Enabled in Log-only mode. This patch interprets this value as
disabled, since audit mode is currently not supported for
Linux.
2 - Enabled and enforced.
3-9 - Enabled and enforcing; requirements are at the discretion of
the operating system.
The values of ibm,trusted-boot under pseries are interpreted as:
0 - Disabled
1 - Enabled
Signed-off-by: Nayna Jain <nayna@linux.ibm.com>
Reviewed-by: Daniel Axtens <dja@axtens.net>
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
[mpe: Drop machdep.h inclusion, tweak change log slightly]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1594813921-12425-1-git-send-email-nayna@linux.ibm.com
Acked-by: Michal Suchanek <msuchanek@suse.de>
---
arch/powerpc/kernel/secure_boot.c | 18 ++++++++++++++++--
1 file changed, 16 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/kernel/secure_boot.c b/arch/powerpc/kernel/secure_boot.c
index 4b982324d368..f9af305d9579 100644
--- a/arch/powerpc/kernel/secure_boot.c
+++ b/arch/powerpc/kernel/secure_boot.c
@@ -23,12 +23,19 @@ bool is_ppc_secureboot_enabled(void)
{
struct device_node *node;
bool enabled = false;
+ u32 secureboot;
node = get_ppc_fw_sb_node();
enabled = of_property_read_bool(node, "os-secureboot-enforcing");
-
of_node_put(node);
+ if (enabled)
+ goto out;
+
+ if (!of_property_read_u32(of_root, "ibm,secure-boot", &secureboot))
+ enabled = (secureboot > 1);
+
+out:
pr_info("Secure boot mode %s\n", enabled ? "enabled" : "disabled");
return enabled;
@@ -38,12 +45,19 @@ bool is_ppc_trustedboot_enabled(void)
{
struct device_node *node;
bool enabled = false;
+ u32 trustedboot;
node = get_ppc_fw_sb_node();
enabled = of_property_read_bool(node, "trusted-enabled");
-
of_node_put(node);
+ if (enabled)
+ goto out;
+
+ if (!of_property_read_u32(of_root, "ibm,trusted-boot", &trustedboot))
+ enabled = (trustedboot > 0);
+
+out:
pr_info("Trusted boot mode %s\n", enabled ? "enabled" : "disabled");
return enabled;
--
2.28.0