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Fri, 15 May 2026 14:15:29 -0700 (PDT) From: Ross Philipson To: linux-kernel@vger.kernel.org, x86@kernel.org, linux-integrity@vger.kernel.org, linux-doc@vger.kernel.org, linux-crypto@vger.kernel.org, kexec@lists.infradead.org, linux-efi@vger.kernel.org, iommu@lists.linux.dev Cc: ross.philipson@gmail.com, dpsmith@apertussolutions.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, dave.hansen@linux.intel.com, ardb@kernel.org, mjg59@srcf.ucam.org, James.Bottomley@hansenpartnership.com, peterhuewe@gmx.de, jarkko@kernel.org, jgg@ziepe.ca, luto@amacapital.net, nivedita@alum.mit.edu, herbert@gondor.apana.org.au, davem@davemloft.net, corbet@lwn.net, ebiederm@xmission.com, dwmw2@infradead.org, baolu.lu@linux.intel.com, kanth.ghatraju@oracle.com, daniel.kiper@oracle.com, andrew.cooper3@citrix.com, trenchboot-devel@googlegroups.com Subject: [PATCH v16 27/38] x86: Add early SHA-256 support for Secure Launch early measurements Date: Fri, 15 May 2026 14:13:59 -0700 Message-ID: <20260515211410.31440-28-ross.philipson@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260515211410.31440-1-ross.philipson@gmail.com> References: <20260515211410.31440-1-ross.philipson@gmail.com> Precedence: bulk X-Mailing-List: linux-efi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: "Daniel P. Smith" 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 library directly in the early boot code. Signed-off-by: Daniel P. Smith Signed-off-by: Ross Philipson --- arch/x86/boot/startup/Makefile | 1 + arch/x86/boot/startup/lib-sha256.c | 6 ++++++ 2 files changed, 7 insertions(+) create mode 100644 arch/x86/boot/startup/lib-sha256.c diff --git a/arch/x86/boot/startup/Makefile b/arch/x86/boot/startup/Makefile index e283ee4c1f45..071a90f23ae0 100644 --- a/arch/x86/boot/startup/Makefile +++ b/arch/x86/boot/startup/Makefile @@ -22,6 +22,7 @@ obj-$(CONFIG_X86_64) += gdt_idt.o map_kernel.o obj-$(CONFIG_AMD_MEM_ENCRYPT) += sme.o sev-startup.o slaunch-objs += lib-sha1.o +slaunch-objs += lib-sha256.o obj-$(CONFIG_SECURE_LAUNCH) += $(slaunch-objs) pi-objs := $(patsubst %.o,$(obj)/%.o,$(obj-y)) diff --git a/arch/x86/boot/startup/lib-sha256.c b/arch/x86/boot/startup/lib-sha256.c new file mode 100644 index 000000000000..f60df97f9244 --- /dev/null +++ b/arch/x86/boot/startup/lib-sha256.c @@ -0,0 +1,6 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2026 Apertus Solutions, LLC + */ + +#include "../../../../lib/crypto/sha256.c" -- 2.47.3