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

- From: Michal Suchánek \<hidden\>
- Date: 2021-12-09 09:22:07 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2021/12/1602255
- Thread: https://ratatoskr.run/keyrings/2021/12/1602255/t.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
```