Re: [RESEND PATCH] ima: Fix build failure on powerpc when TCG_IBMVTPM dependencies are not met

From: Mimi Zohar
Date: Wed Dec 03 2014 - 09:49:10 EST

On Wed, 2014-12-03 at 17:04 +1100, Michael Ellerman wrote:
> On powerpc we can end up with IMA=y and PPC_PSERIES=n which leads to:
> warning: (IMA) selects TCG_IBMVTPM which has unmet direct dependencies (TCG_TPM && PPC_PSERIES)
> tpm_ibmvtpm.c:(.text+0x14f3e8): undefined reference to `.plpar_hcall_norets'
> I'm not sure why IMA needs to select those user-visible symbols, but if
> it must then the simplest fix is to just express the proper dependencies
> on the select.

On systems without a TPM, IMA goes into a "by-pass" mode, which stores
the measurements without extending the TPM PCR. On Power, there isn't a
HW TPM, but on Power running PowerVM there is a virtual TPM(vTPM). On
Power running PowerKVM there isn't support for vTPM, yet. The Kconfig
needs to differentiate between the two.

> Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>

[CC'ing: Vicky(Lo, Hon Ching), Ashley Lai, George Wilson]
Sorry, I'm still waiting to hear back from the developers/testers.


> ---
> security/integrity/ima/Kconfig | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
> Could someone please pick this up?
> diff --git a/security/integrity/ima/Kconfig b/security/integrity/ima/Kconfig
> index e099875643c5..b51668d04f9d 100644
> --- a/security/integrity/ima/Kconfig
> +++ b/security/integrity/ima/Kconfig
> @@ -10,7 +10,7 @@ config IMA
> select TCG_TPM if HAS_IOMEM && !UML
> select TCG_TIS if TCG_TPM && X86
> - select TCG_IBMVTPM if TCG_TPM && PPC64
> help
> The Trusted Computing Group(TCG) runtime Integrity
> Measurement Architecture(IMA) maintains a list of hash

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