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Date: Mon, 4 Jul 2022 10:36:16 +0800 From: Baoquan He <bhe@...hat.com> To: Jonathan McDowell <noodles@...com> Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, "x86@...nel.org" <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>, Mimi Zohar <zohar@...ux.ibm.com>, Dmitry Kasatkin <dmitry.kasatkin@...il.com>, James Morris <jmorris@...ei.org>, "Serge E. Hallyn" <serge@...lyn.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>, "linux-security-module@...r.kernel.org" <linux-security-module@...r.kernel.org>, "kexec@...ts.infradead.org" <kexec@...ts.infradead.org> Subject: Re: [PATCH v7] x86/kexec: Carry forward IMA measurement log on kexec On 06/30/22 at 08:36am, Jonathan McDowell wrote: > On kexec file load, the Integrity Measurement Architecture (IMA) > subsystem may verify the IMA signature of the kernel and initramfs, and > measure it. The command line parameters passed to the kernel in the > kexec call may also be measured by IMA. > > A remote attestation service can verify a TPM quote based on the TPM > event log, the IMA measurement list and the TPM PCR data. This can > be achieved only if the IMA measurement log is carried over from the > current kernel to the next kernel across the kexec call. > > PowerPC and ARM64 both achieve this using device tree with a > "linux,ima-kexec-buffer" node. x86 platforms generally don't make use of > device tree, so use the setup_data mechanism to pass the IMA buffer to > the new kernel. > > (Mimi, Baoquan, I haven't included your reviewed-bys because this has > changed the section annotations to __init and Boris reasonably enough > wants to make sure IMA folk are happy before taking this update.) > > Signed-off-by: Jonathan McDowell <noodles@...com> > Link: https://lore.kernel.org/r/YmKyvlF3my1yWTvK@noodles-fedora-PC23Y6EG LGTM, Reviewed-by: Baoquan He <bhe@...hat.com>
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