> The memory area of the TPM measurement log is currently not properly > duplicated for carrying it across kexec when an Open Firmware > Devicetree is used. Therefore, the contents of the log get corrupted. > Fix this for the kexec_file_load() syscall by allocating a buffer and > copying the contents of the existing log into it. The new buffer is > preserved across the kexec and a pointer to it is available when the new > kernel is started. To achieve this, store the allocated buffer's address > in the flattened device tree (fdt) under the name linux,tpm-kexec-buffer > and search for this entry early in the kernel startup before the TPM > subsystem starts up. Adjust the pointer in the of-tree stored under > linux,sml-base to point to this buffer holding the preserved log. The > TPM driver can then read the base address from this entry when making > the log available. > Signed-off-by: Stefan Berger <stefanb@xxxxxxxxxxxxx> Tested-by: Nageswara R Sastry <rnsastry@xxxxxxxxxxxxx> ... > -- > 2.35.1
