Re: [PATCH v2 2/6] powerpc/kexec_file: Add KEXEC_SIG support.

[Nayna]

On 11/25/21 13:02, Michal Suchanek wrote:
Copy the code from s390x
Signed-off-by: Michal Suchanek<msucha...@suse.de>
---
  arch/powerpc/Kconfig        | 11 +++++++++++
  arch/powerpc/kexec/elf_64.c | 36 ++++++++++++++++++++++++++++++++++++
  2 files changed, 47 insertions(+)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index ac0c515552fd..ecc1227a77f1 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -561,6 +561,17 @@ config KEXEC_FILE
  config ARCH_HAS_KEXEC_PURGATORY
        def_bool KEXEC_FILE

+config KEXEC_SIG
+       bool "Verify kernel signature during kexec_file_load() syscall"
+       depends on KEXEC_FILE && MODULE_SIG_FORMAT
+       help
+         This option makes kernel signature verification mandatory for
+         the kexec_file_load() syscall.
+

Since powerpc also supports IMA_ARCH_POLICY for kernel image signature 
verification, please include the following:

"An alternative implementation for the powerpc arch is 
IMA_ARCH_POLICY. It verifies the appended kernel image signature and 
additionally includes both the signed and unsigned file hashes in the 
IMA measurement list, extends the IMA PCR in the TPM, and prevents 
blacklisted binary kernel images from being kexec'd"

Thanks & Regards,

    - Nayna