forked from Minki/linux
61f879d97c
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
65 lines
1.3 KiB
C
65 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2019 IBM Corporation
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* Author: Nayna Jain
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*/
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#include <linux/types.h>
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#include <linux/of.h>
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#include <asm/secure_boot.h>
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static struct device_node *get_ppc_fw_sb_node(void)
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{
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static const struct of_device_id ids[] = {
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{ .compatible = "ibm,secureboot", },
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{ .compatible = "ibm,secureboot-v1", },
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{ .compatible = "ibm,secureboot-v2", },
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{},
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};
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return of_find_matching_node(NULL, ids);
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}
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bool is_ppc_secureboot_enabled(void)
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{
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struct device_node *node;
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bool enabled = false;
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u32 secureboot;
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node = get_ppc_fw_sb_node();
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enabled = of_property_read_bool(node, "os-secureboot-enforcing");
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of_node_put(node);
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if (enabled)
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goto out;
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if (!of_property_read_u32(of_root, "ibm,secure-boot", &secureboot))
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enabled = (secureboot > 1);
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out:
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pr_info("Secure boot mode %s\n", enabled ? "enabled" : "disabled");
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return enabled;
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}
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bool is_ppc_trustedboot_enabled(void)
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{
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struct device_node *node;
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bool enabled = false;
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u32 trustedboot;
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node = get_ppc_fw_sb_node();
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enabled = of_property_read_bool(node, "trusted-enabled");
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of_node_put(node);
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if (enabled)
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goto out;
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if (!of_property_read_u32(of_root, "ibm,trusted-boot", &trustedboot))
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enabled = (trustedboot > 0);
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out:
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pr_info("Trusted boot mode %s\n", enabled ? "enabled" : "disabled");
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return enabled;
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}
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