keys: fix trusted/encrypted keys sparse rcu_assign_pointer messages

Define rcu_assign_keypointer(), which uses the key payload.rcudata instead
of payload.data, to resolve the CONFIG_SPARSE_RCU_POINTER message:
"incompatible types in comparison expression (different address spaces)"

Replace the rcu_assign_pointer() calls in encrypted/trusted keys with
rcu_assign_keypointer().

Signed-off-by: Mimi Zohar <zohar@us.ibm.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <jmorris@namei.org>

4 files changed, 9 insertions, 4 deletions

diff --git a/include/linux/key.h b/include/linux/key.h
index 183a6af7715d..bfc014c57351 100644
--- a/include/linux/key.h
+++ b/include/linux/key.h
@@ -293,6 +293,9 @@ static inline bool key_is_instantiated(const struct key *key)
         (rcu_dereference_protected((KEY)->payload.rcudata,              \
                                    rwsem_is_locked(&((struct key *)(KEY))->sem)))
 
+#define rcu_assign_keypointer(KEY, PAYLOAD)                             \
+        (rcu_assign_pointer((KEY)->payload.rcudata, PAYLOAD))
+
 #ifdef CONFIG_SYSCTL
 extern ctl_table key_sysctls[];
 #endif
diff --git a/security/keys/encrypted-keys/encrypted.c b/security/keys/encrypted-keys/encrypted.c
index 41144f71d615..d91efb6901e9 100644
--- a/security/keys/encrypted-keys/encrypted.c
+++ b/security/keys/encrypted-keys/encrypted.c
@@ -810,7 +810,7 @@ static int encrypted_instantiate(struct key *key, const void *data,
                 goto out;
         }
 
-        rcu_assign_pointer(key->payload.data, epayload);
+        rcu_assign_keypointer(key, epayload);
 out:
         kfree(datablob);
         return ret;
@@ -874,7 +874,7 @@ static int encrypted_update(struct key *key, const void *data, size_t datalen)
         memcpy(new_epayload->payload_data, epayload->payload_data,
                epayload->payload_datalen);
 
-        rcu_assign_pointer(key->payload.data, new_epayload);
+        rcu_assign_keypointer(key, new_epayload);
         call_rcu(&epayload->rcu, encrypted_rcu_free);
 out:
         kfree(buf);
diff --git a/security/keys/encrypted-keys/masterkey_trusted.c b/security/keys/encrypted-keys/masterkey_trusted.c
index df87272e3f51..8c16c3e472e7 100644
--- a/security/keys/encrypted-keys/masterkey_trusted.c
+++ b/security/keys/encrypted-keys/masterkey_trusted.c
@@ -18,6 +18,8 @@
 #include <linux/module.h>
 #include <linux/err.h>
 #include <keys/trusted-type.h>
+#include <keys/encrypted-type.h>
+#include "encrypted.h"
 
 /*
  * request_trusted_key - request the trusted key
diff --git a/security/keys/trusted.c b/security/keys/trusted.c
index 0ed5fdf238a2..2d5d041f2049 100644
--- a/security/keys/trusted.c
+++ b/security/keys/trusted.c
@@ -993,7 +993,7 @@ out:
         kfree(datablob);
         kfree(options);
         if (!ret)
-                rcu_assign_pointer(key->payload.data, payload);
+                rcu_assign_keypointer(key, payload);
         else
                 kfree(payload);
         return ret;
@@ -1067,7 +1067,7 @@ static int trusted_update(struct key *key, const void *data, size_t datalen)
                         goto out;
                 }
         }
-        rcu_assign_pointer(key->payload.data, new_p);
+        rcu_assign_keypointer(key, new_p);
         call_rcu(&p->rcu, trusted_rcu_free);
 out:
         kfree(datablob);