From 61f879d97ce4510dd29d676a20d67692e3b34806 Mon Sep 17 00:00:00 2001 From: Nayna Jain Date: Wed, 15 Jul 2020 07:52:01 -0400 Subject: [PATCH] powerpc/pseries: Detect secure and trusted boot state of the system. 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 Reviewed-by: Daniel Axtens Reviewed-by: Mimi Zohar [mpe: Drop machdep.h inclusion, tweak change log slightly] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/1594813921-12425-1-git-send-email-nayna@linux.ibm.com --- 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;