On PLPKS enabled PowerVM LPAR, there is no provision to load signed
third-party kernel modules when the key management mode is static. This
is because keys from secure boot secvars are only loaded when the key
management mode is dynamic.

Allow loading of the trustedcadb and moduledb keys even in the static
key management mode, where the secvar format string takes the form
"ibm,plpks-sb-v0".

Signed-off-by: Srish Srinivasan <ssrish@linux.ibm.com>
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Nayna Jain <nayna@linux.ibm.com>
Reviewed-by: Andrew Donnellan <ajd@linux.ibm.com>
---
 security/integrity/platform_certs/load_powerpc.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/security/integrity/platform_certs/load_powerpc.c b/security/integrity/platform_certs/load_powerpc.c
index c85febca3343..714c961a00f5 100644
--- a/security/integrity/platform_certs/load_powerpc.c
+++ b/security/integrity/platform_certs/load_powerpc.c
@@ -75,12 +75,13 @@ static int __init load_powerpc_certs(void)
 		return -ENODEV;
 
 	// Check for known secure boot implementations from OPAL or PLPKS
-	if (strcmp("ibm,edk2-compat-v1", buf) && strcmp("ibm,plpks-sb-v1", buf)) {
+	if (strcmp("ibm,edk2-compat-v1", buf) && strcmp("ibm,plpks-sb-v1", buf) &&
+	    strcmp("ibm,plpks-sb-v0", buf)) {
 		pr_err("Unsupported secvar implementation \"%s\", not loading certs\n", buf);
 		return -ENODEV;
 	}
 
-	if (strcmp("ibm,plpks-sb-v1", buf) == 0)
+	if (strcmp("ibm,plpks-sb-v1", buf) == 0 || strcmp("ibm,plpks-sb-v0", buf) == 0)
 		/* PLPKS authenticated variables ESL data is prefixed with 8 bytes of timestamp */
 		offset = 8;
 
-- 
2.47.1

On 11/06/25 2:49 AM, Srish Srinivasan wrote:
> On PLPKS enabled PowerVM LPAR, there is no provision to load signed
> third-party kernel modules when the key management mode is static. This
> is because keys from secure boot secvars are only loaded when the key
> management mode is dynamic.
>
> Allow loading of the trustedcadb and moduledb keys even in the static
> key management mode, where the secvar format string takes the form
> "ibm,plpks-sb-v0".
>
> Signed-off-by: Srish Srinivasan <ssrish@linux.ibm.com>
> Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
> Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
> Reviewed-by: Nayna Jain <nayna@linux.ibm.com>
> Reviewed-by: Andrew Donnellan <ajd@linux.ibm.com>
Tested-by: R Nageswara Sastry <rnsastry@linux.ibm.com>
With the following scenarios:
1. With and with out secure boot by enabling keystore_signed_updates and 
keystore_kbytes
2. With Dynamic Key Guest Secure Boot
3. With Static Key Guest Secure Boot
> ---
>   security/integrity/platform_certs/load_powerpc.c | 5 +++--
>   1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/security/integrity/platform_certs/load_powerpc.c b/security/integrity/platform_certs/load_powerpc.c
> index c85febca3343..714c961a00f5 100644
> --- a/security/integrity/platform_certs/load_powerpc.c
> +++ b/security/integrity/platform_certs/load_powerpc.c
> @@ -75,12 +75,13 @@ static int __init load_powerpc_certs(void)
>   		return -ENODEV;
>   
>   	// Check for known secure boot implementations from OPAL or PLPKS
> -	if (strcmp("ibm,edk2-compat-v1", buf) && strcmp("ibm,plpks-sb-v1", buf)) {
> +	if (strcmp("ibm,edk2-compat-v1", buf) && strcmp("ibm,plpks-sb-v1", buf) &&
> +	    strcmp("ibm,plpks-sb-v0", buf)) {
>   		pr_err("Unsupported secvar implementation \"%s\", not loading certs\n", buf);
>   		return -ENODEV;
>   	}
>   
> -	if (strcmp("ibm,plpks-sb-v1", buf) == 0)
> +	if (strcmp("ibm,plpks-sb-v1", buf) == 0 || strcmp("ibm,plpks-sb-v0", buf) == 0)
>   		/* PLPKS authenticated variables ESL data is prefixed with 8 bytes of timestamp */
>   		offset = 8;
>   

-- 
Thanks and Regards
R.Nageswara Sastry