________________________________________ > From: Stefan Berger <stefanb@xxxxxxxxxxxxx> > Sent: 07 July 2022 10:50 PM > To: kexec@xxxxxxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; linux-integrity@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linuxppc-dev@xxxxxxxxxxxxxxxx > Cc: nayna@xxxxxxxxxxxxx; Nageswara R Sastry; mpe@xxxxxxxxxxxxxx; Jonathan McDowell; Borislav Petkov; Mimi Zohar > Subject: [PATCH v6 3/6] x86/kexec: Carry forward IMA measurement log on kexec > From: Jonathan McDowell <noodles@xxxxxx> > 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. > Signed-off-by: Jonathan McDowell <noodles@xxxxxx> > Signed-off-by: Borislav Petkov <bp@xxxxxxx> > Reviewed-by: Mimi Zohar <zohar@xxxxxxxxxxxxx> # IMA function definitions > Link: https://lore.kernel.org/r/YmKyvlF3my1yWTvK@noodles-fedora-PC23Y6EG > --- Tested-by: Nageswara R Sastry <rnsastry@xxxxxxxxxxxxx>
