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Re: [PATCH v3 0/9] kexec_file_load implementation for PowerPC

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On 23/06/16 03:02, Thiago Jung Bauermann wrote:
> Hello Balbir,
>
Hi Thiago
 
>>> 3. have IMA pass-on its event log (where integrity measurements are
>>>
>>>    registered) accross kexec to the second kernel, so that the event
>>>    history is preserved.
>>
>> OK.. and this is safe? Do both the kernels need to be signed by the
>> same certificate?
> 
> They don't. The integrity of the event log (assuming that is what you mean 
> by "this" in "this is safe") is guaranteed by the TPM device. Each event in 
> the measurement list extends a PCR and records its PCR value. It is 
> cryptographically guaranteed that if you replay the PCR extends recorded in 
> the event log and in the end of the process they match the current PCR 
> values in the TPM device, then that event log is correct.


What I meant was how does the new kernel know that the old kernel did not
cheat while passing on the values? I presume because we trust that kernel
via a signature.


and

How do we know the new kernel is safe to load - I guess via a signature that
the new kernel is signed with (assuming it is present in the key ring).

Balbir Singh

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[PATCH v3 0/9] kexec_file_load implementation for PowerPC Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-06-21 21:50 +0200
  [PATCH v3 9/9] powerpc: Add purgatory for kexec_file_load implementation. Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-06-21 21:50 +0200
  [PATCH v3 2/9] kexec_file: Generalize kexec_add_buffer. Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-06-21 22:00 +0200
    Re: [PATCH v3 2/9] kexec_file: Generalize kexec_add_buffer. Dave Young <dyoung@redhat.com> - 2016-06-22 12:30 +0200
      Re: [PATCH v3 2/9] kexec_file: Generalize kexec_add_buffer. Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-06-23 01:40 +0200
        Re: [PATCH v3 2/9] kexec_file: Generalize kexec_add_buffer. Dave Young <dyoung@redhat.com> - 2016-06-23 04:30 +0200
  [PATCH v3 4/9] powerpc: Factor out relocation code from module_64.c to elf_util_64.c. Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-06-21 22:00 +0200
  [PATCH v3 5/9] powerpc: Generalize elf64_apply_relocate_add. Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-06-21 22:00 +0200
  [PATCH v3 7/9] powerpc: Implement kexec_file_load. Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-06-21 22:00 +0200
  Re: [PATCH v3 0/9] kexec_file_load implementation for PowerPC Balbir Singh <bsingharora@gmail.com> - 2016-06-22 15:40 +0200
    Re: [PATCH v3 0/9] kexec_file_load implementation for PowerPC Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-06-22 19:10 +0200
      Re: [PATCH v3 0/9] kexec_file_load implementation for PowerPC Balbir Singh <bsingharora@gmail.com> - 2016-06-23 02:00 +0200
        Re: [PATCH v3 0/9] kexec_file_load implementation for PowerPC Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-06-23 18:50 +0200

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