[PATCH 13/17] crypto/algapi.c: skip crypto_check_module_sig() for the standalone crypto module

[Jay Wang <wanjay@amazon.com>]

From: Vegard Nossum <vegard.nossum@oracle.com>

The signature check in regular module verification process
`crypto_check_module_sig()` is skipped for this standalone crypto module
because its signature has already been checked during load (as described
in later patch).

Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
[Revise commit message]
Signed-off-by: Jay Wang <wanjay@amazon.com>
---
 crypto/algapi.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/crypto/algapi.c b/crypto/algapi.c
index 37de377719ae..663698e0cd65 100644
--- a/crypto/algapi.c
+++ b/crypto/algapi.c
@@ -24,7 +24,19 @@ static LIST_HEAD(crypto_template_list);
 
 static inline void crypto_check_module_sig(struct module *mod)
 {
-	if (fips_enabled && mod && !module_sig_ok(mod))
+#ifdef FIPS_MODULE
+	/*
+	 * The FIPS module should ignore its own signature check, as it was
+	 * already been verified elsewhere during loading.
+	 */
+	if (mod == THIS_MODULE)
+		return;
+#else
+	if (!fips_enabled)
+		return;
+#endif
+
+	if (mod && !module_sig_ok(mod))
 		panic("Module %s signature verification failed in FIPS mode\n",
 		      module_name(mod));
 }
-- 
2.47.3