Re: [PATCH v7] x86/kexec: Carry forward IMA measurement log on kexec
On Thu, 2022-06-30 at 08:36 +, 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.) FYI, comments like this should be added before the patch changelog (after the '---' separator). > > Signed-off-by: Jonathan McDowell > Link: https://lore.kernel.org/r/YmKyvlF3my1yWTvK@noodles-fedora-PC23Y6EG Reviewed-by: Mimi Zohar # IMA function definitions ___ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec
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 > Link: https://lore.kernel.org/r/YmKyvlF3my1yWTvK@noodles-fedora-PC23Y6EG LGTM, Reviewed-by: Baoquan He ___ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec
