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[v9,07/19] x86: Add early SHA-256 support for Secure Launch early measurements

Message ID 20240531010331.134441-8-ross.philipson@oracle.com (mailing list archive)
State Not Applicable
Delegated to: Herbert Xu
Headers show
Series x86: Trenchboot secure dynamic launch Linux kernel support | expand

Commit Message

Ross Philipson May 31, 2024, 1:03 a.m. UTC 
From: "Daniel P. Smith" <dpsmith@apertussolutions.com>

The SHA-256 algorithm is necessary to measure configuration information into
the TPM as early as possible before using the values. This implementation
uses the established approach of #including the SHA-256 libraries directly in
the code since the compressed kernel is not uncompressed at this point.

Signed-off-by: Daniel P. Smith <dpsmith@apertussolutions.com>
Signed-off-by: Ross Philipson <ross.philipson@oracle.com>
---
 arch/x86/boot/compressed/Makefile       | 2 +-
 arch/x86/boot/compressed/early_sha256.c | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)
 create mode 100644 arch/x86/boot/compressed/early_sha256.c
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Patch

diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile
index 3307ebef4e1b..9189a0e28686 100644
--- a/arch/x86/boot/compressed/Makefile
+++ b/arch/x86/boot/compressed/Makefile
@@ -118,7 +118,7 @@  vmlinux-objs-$(CONFIG_EFI) += $(obj)/efi.o
 vmlinux-objs-$(CONFIG_EFI_MIXED) += $(obj)/efi_mixed.o
 vmlinux-objs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 
-vmlinux-objs-$(CONFIG_SECURE_LAUNCH) += $(obj)/early_sha1.o
+vmlinux-objs-$(CONFIG_SECURE_LAUNCH) += $(obj)/early_sha1.o $(obj)/early_sha256.o
 
 $(obj)/vmlinux: $(vmlinux-objs-y) FORCE
 	$(call if_changed,ld)
diff --git a/arch/x86/boot/compressed/early_sha256.c b/arch/x86/boot/compressed/early_sha256.c
new file mode 100644
index 000000000000..293742a90ddc
--- /dev/null
+++ b/arch/x86/boot/compressed/early_sha256.c
@@ -0,0 +1,6 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2024 Apertus Solutions, LLC
+ */
+
+#include "../../../../lib/crypto/sha256.c"