[OpenPower-Firmware] [PATCH 15/16] powerpc/ima: Indicate kernel modules appended signatures are enforced

[Nayna Jain]

From: Mimi Zohar <zohar at linux.ibm.com>

The arch specific kernel module policy rule requires kernel modules to
be signed, either as an IMA signature, stored as an xattr, or as an
appended signature. As a result, kernel modules appended signatures
could be enforced without "sig_enforce" being set or reflected in
/sys/module/module/parameters/sig_enforce. This patch sets
"sig_enforce".

Signed-off-by: Mimi Zohar <zohar at linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
Link: https://lore.kernel.org/r/1572492694-6520-10-git-send-email-zohar@linux.ibm.com
---
 arch/powerpc/kernel/ima_arch.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/ima_arch.c b/arch/powerpc/kernel/ima_arch.c
index b9de0fb45bb9..e34116255ced 100644
--- a/arch/powerpc/kernel/ima_arch.c
+++ b/arch/powerpc/kernel/ima_arch.c
@@ -62,13 +62,17 @@ static const char *const secure_and_trusted_rules[] = {
  */
 const char *const *arch_get_ima_policy(void)
 {
-	if (is_ppc_secureboot_enabled())
+	if (is_ppc_secureboot_enabled()) {
+		if (IS_ENABLED(CONFIG_MODULE_SIG))
+			set_module_sig_enforced();
+
 		if (is_ppc_trustedboot_enabled())
 			return secure_and_trusted_rules;
 		else
 			return secure_rules;
-	else if (is_ppc_trustedboot_enabled())
+	} else if (is_ppc_trustedboot_enabled()) {
 		return trusted_rules;
+	}
 
 	return NULL;
 }
-- 
2.25.1