# Re: \[PATCH v2 2/6\] powerpc/kexec\_file: Add KEXEC\_SIG support.

- List: linux-security-module
- 2 messages, 2 authors
- Page: https://ratatoskr.run/linux-security-module/2021/12/1602255/t

## Re: \[PATCH v2 2/6\] powerpc/kexec\_file: Add KEXEC\_SIG support.

- From: Michal Suchánek \<hidden\>
- Date: 2021-12-09 09:22:07 
- Message: https://ratatoskr.run/linux-security-module/2021/12/1602255.md

```text
Hello,

On Wed, Dec 08, 2021 at 08:51:47PM -0500, Nayna wrote:
> 
> On 11/25/21 13:02, Michal Suchanek wrote:
> > Copy the code from s390x
> > 
> > Signed-off-by: Michal Suchanek<redacted>
> > ---
> >   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
> 
> After manually applying the patch, the build is failing with the following
> error:
> 
> build failed with error "arch/powerpc/kexec/elf_64.o: In function
> `elf64_verify_sig':
> /root/kernel/linus/linux/arch/powerpc/kexec/elf_64.c:160: undefined
> reference to `verify_appended_signature'"

This patch does not add call to verify_appended_signature.

Maybe you applied the following patch as well?

Thanks

Michal
```

## Re: \[PATCH v2 2/6\] powerpc/kexec\_file: Add KEXEC\_SIG support.

- From: Nayna \<hidden\>
- Date: 2021-12-09 21:54:22 
- Message: https://ratatoskr.run/linux-security-module/2021/12/1603168.md

```text

On 12/9/21 04:21, Michal Suchánek wrote:
> Hello,
Hi,
> On Wed, Dec 08, 2021 at 08:51:47PM -0500, Nayna wrote:
>> On 11/25/21 13:02, Michal Suchanek wrote:
>>> Copy the code from s390x
>>>
>>> Signed-off-by: Michal Suchanek<redacted>
>>> ---
>>>    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
>> After manually applying the patch, the build is failing with the following
>> error:
>>
>> build failed with error "arch/powerpc/kexec/elf_64.o: In function
>> `elf64_verify_sig':
>> /root/kernel/linus/linux/arch/powerpc/kexec/elf_64.c:160: undefined
>> reference to `verify_appended_signature'"
> This patch does not add call to verify_appended_signature.
>
> Maybe you applied the following patch as well?

Yes, I tried build after applying all the patches.

Thanks & Regards,

    - Nayna

```