Re: [PATCH v3 1/2] lockdown: kexec_file: prevent unsigned kernel image when KEXEC_SIG not enabled

Hi Coiby, On Fri, 2022-12-30 at 14:58 +0800, Coiby Xu wrote: > A kernel builder may not enable KEXEC_SIG and some architectures like > ppc64 simply don't have KEXEC_SIG. In these cases, unless both > IMA_ARCH_POLICY and secure boot also enabled, lockdown doesn't prevent > unsigned kernel image

[PATCH v3 1/2] lockdown: kexec_file: prevent unsigned kernel image when KEXEC_SIG not enabled

A kernel builder may not enable KEXEC_SIG and some architectures like ppc64 simply don't have KEXEC_SIG. In these cases, unless both IMA_ARCH_POLICY and secure boot also enabled, lockdown doesn't prevent unsigned kernel image from being kexec'ed via the kexec_file_load syscall whereas it could