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SubjectRe: [tip: x86/boot] x86/kexec: Carry forward IMA measurement log on kexec
Date
On Thu, Jul 07, 2022 at 04:52:32PM -0000, tip-bot2 for Jonathan McDowell wrote:
> The following commit has been merged into the x86/boot branch of tip:

Just to clarify there's not some confusion going on; this is already in
-next via tip/master via tip/x86/kdump.

https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?h=x86/kdump&id=b69a2afd5afce9bf6d56e349d6ab592c916e20f2

> Commit-ID: 2faaa8f3ef16d794ecb28f9a7d9dca25cff98bb3
> Gitweb: https://git.kernel.org/tip/2faaa8f3ef16d794ecb28f9a7d9dca25cff98bb3
> Author: Jonathan McDowell <noodles@fb.com>
> AuthorDate: Thu, 30 Jun 2022 08:36:12
> Committer: Dave Hansen <dave.hansen@linux.intel.com>
> CommitterDate: Wed, 06 Jul 2022 15:45:55 -07:00
>
> x86/kexec: Carry forward IMA measurement log on kexec
>
> 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@fb.com>
> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
> Reviewed-by: Mimi Zohar <zohar@linux.ibm.com> # IMA function
> Reviewed-by: Baoquan He <bhe@redhat.com>
> Link: https://lore.kernel.org/r/YmKyvlF3my1yWTvK@noodles-fedora-PC23Y6EG
> Link: https://lkml.kernel.org/r/Yr1geLyslnjKck86@noodles-fedora.dhcp.thefacebook.com

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