From: Mimi Zohar <zohar@linux.ibm.com>
To: linuxppc-dev@ozlabs.org, linux-efi@vger.kernel.org,
linux-integrity@vger.kernel.org
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Eric Ricther <erichte@linux.ibm.com>,
Nayna Jain <nayna@linux.ibm.com>,
linux-kernel@vger.kernel.org, Paul Mackerras <paulus@samba.org>,
Jeremy Kerr <jk@ozlabs.org>, Oliver O'Halloran <oohall@gmail.com>
Subject: [PATCH v10 3/9] powerpc: detect the trusted boot state of the system
Date: Wed, 30 Oct 2019 23:31:28 -0400 [thread overview]
Message-ID: <1572492694-6520-4-git-send-email-zohar@linux.ibm.com> (raw)
In-Reply-To: <1572492694-6520-1-git-send-email-zohar@linux.ibm.com>
From: Nayna Jain <nayna@linux.ibm.com>
While secure boot permits only properly verified signed kernels to be
booted, trusted boot calculates the file hash of the kernel image and
stores the measurement prior to boot, that can be subsequently compared
against good known values via attestation services.
This patch reads the trusted boot state of a PowerNV system. The state
is used to conditionally enable additional measurement rules in the IMA
arch-specific policies.
Signed-off-by: Nayna Jain <nayna@linux.ibm.com>
---
arch/powerpc/include/asm/secure_boot.h | 6 ++++++
arch/powerpc/kernel/secure_boot.c | 26 ++++++++++++++++++++++++++
2 files changed, 32 insertions(+)
diff --git a/arch/powerpc/include/asm/secure_boot.h b/arch/powerpc/include/asm/secure_boot.h
index 07d0fe0ca81f..a2ff556916c6 100644
--- a/arch/powerpc/include/asm/secure_boot.h
+++ b/arch/powerpc/include/asm/secure_boot.h
@@ -11,6 +11,7 @@
#ifdef CONFIG_PPC_SECURE_BOOT
bool is_ppc_secureboot_enabled(void);
+bool is_ppc_trustedboot_enabled(void);
#else
@@ -19,5 +20,10 @@ static inline bool is_ppc_secureboot_enabled(void)
return false;
}
+static inline bool is_ppc_trustedboot_enabled(void)
+{
+ return false;
+}
+
#endif
#endif
diff --git a/arch/powerpc/kernel/secure_boot.c b/arch/powerpc/kernel/secure_boot.c
index 63dc82c50862..a6a5f17ede03 100644
--- a/arch/powerpc/kernel/secure_boot.c
+++ b/arch/powerpc/kernel/secure_boot.c
@@ -7,6 +7,17 @@
#include <linux/of.h>
#include <asm/secure_boot.h>
+static struct device_node *get_ppc_fw_sb_node(void)
+{
+ static const struct of_device_id ids[] = {
+ { .compatible = "ibm,secureboot-v1", },
+ { .compatible = "ibm,secureboot-v2", },
+ {},
+ };
+
+ return of_find_matching_node(NULL, ids);
+}
+
bool is_ppc_secureboot_enabled(void)
{
struct device_node *node;
@@ -30,3 +41,18 @@ bool is_ppc_secureboot_enabled(void)
pr_info("Secure boot mode %s\n", enabled ? "enabled" : "disabled");
return enabled;
}
+
+bool is_ppc_trustedboot_enabled(void)
+{
+ struct device_node *node;
+ bool enabled = false;
+
+ node = get_ppc_fw_sb_node();
+ enabled = of_property_read_bool(node, "trusted-enabled");
+
+ of_node_put(node);
+
+ pr_info("Trusted boot mode %s\n", enabled ? "enabled" : "disabled");
+
+ return enabled;
+}
--
2.7.5
next prev parent reply other threads:[~2019-10-31 3:38 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-31 3:31 [PATCH v10 0/9] powerpc: Enabling IMA arch specific secure boot policies Mimi Zohar
2019-10-31 3:31 ` [PATCH v10 1/9] powerpc: detect the secure boot mode of the system Mimi Zohar
2019-11-05 5:14 ` Eric Richter
2019-11-05 23:00 ` [PATCH v10a " Eric Richter
2019-11-14 9:08 ` Michael Ellerman
2019-10-31 3:31 ` [PATCH v10 2/9] powerpc/ima: add support to initialize ima policy rules Mimi Zohar
2019-11-14 9:08 ` Michael Ellerman
2019-10-31 3:31 ` Mimi Zohar [this message]
2019-11-05 23:02 ` [PATCH v10a 3/9] powerpc: detect the trusted boot state of the system Eric Richter
2019-11-14 9:08 ` Michael Ellerman
2019-10-31 3:31 ` [PATCH v10 4/9] powerpc/ima: define trusted boot policy Mimi Zohar
2019-11-14 9:08 ` Michael Ellerman
2019-10-31 3:31 ` [PATCH v10 5/9] ima: make process_buffer_measurement() generic Mimi Zohar
2019-10-31 17:02 ` Lakshmi Ramasubramanian
2019-10-31 17:22 ` Lakshmi Ramasubramanian
2019-11-14 9:08 ` Michael Ellerman
2019-10-31 3:31 ` [PATCH v10 6/9] certs: add wrapper function to check blacklisted binary hash Mimi Zohar
2019-11-14 9:08 ` Michael Ellerman
2019-10-31 3:31 ` [PATCH v10 7/9] ima: check against blacklisted hashes for files with modsig Mimi Zohar
2019-11-14 9:08 ` Michael Ellerman
2019-10-31 3:31 ` [PATCH v10 8/9] powerpc/ima: update ima arch policy to check for blacklist Mimi Zohar
2019-11-14 9:08 ` Michael Ellerman
2019-10-31 3:31 ` [RFC PATCH v10 9/9] powerpc/ima: indicate kernel modules appended signatures are enforced Mimi Zohar
2019-11-14 9:08 ` Michael Ellerman
2019-12-09 20:27 ` [PATCH v10 0/9] powerpc: Enabling IMA arch specific secure boot policies Lakshmi Ramasubramanian
2019-12-09 21:36 ` Mimi Zohar
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