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integrity/platform_certs: Allow loading of keys in the static key management mode

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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>
Tested-by: R Nageswara Sastry <rnsastry@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>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250610211907.101384-4-ssrish@linux.ibm.com
This commit is contained in:
Srish Srinivasan 2025-06-11 02:49:07 +05:30 committed by Madhavan Srinivasan
parent c1d96cd9a1
commit bde5b1a155
1 changed files with 3 additions and 2 deletions
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5
security/integrity/platform_certs/load_powerpc.c
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@ -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;