[PATCH (RESEND)] ecryptfs: propagate key errors up at mount time

[Eric Sandeen <sandeen@redhat.com>]

(re-sending this, forgot to actually put it on any list last time!)

Mounting with invalid key signatures should probably fail,
if they were specifically requested but not available.

Also fix case checks in process_request_key_err() for
the right sign of the errnos, as spotted by Jan Tluka.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Acked-by: Michael Halcrow <mhalcrow@us.ibm.com>
Reported-by: Jan Tluka <jtluka@redhat.com>
---

Index: linux-2.6/fs/ecryptfs/keystore.c
===================================================================
--- linux-2.6.orig/fs/ecryptfs/keystore.c	2008-06-05 13:44:20.363046095 -0500
+++ linux-2.6/fs/ecryptfs/keystore.c	2008-06-13 15:16:37.738983417 -0500
@@ -44,15 +44,15 @@ static int process_request_key_err(long 
 	int rc = 0;
 
 	switch (err_code) {
-	case ENOKEY:
+	case -ENOKEY:
 		ecryptfs_printk(KERN_WARNING, "No key\n");
 		rc = -ENOENT;
 		break;
-	case EKEYEXPIRED:
+	case -EKEYEXPIRED:
 		ecryptfs_printk(KERN_WARNING, "Key expired\n");
 		rc = -ETIME;
 		break;
-	case EKEYREVOKED:
+	case -EKEYREVOKED:
 		ecryptfs_printk(KERN_WARNING, "Key revoked\n");
 		rc = -EINVAL;
 		break;
@@ -963,8 +963,7 @@ int ecryptfs_keyring_auth_tok_for_sig(st
 	if (!(*auth_tok_key) || IS_ERR(*auth_tok_key)) {
 		printk(KERN_ERR "Could not find key with description: [%s]\n",
 		       sig);
-		process_request_key_err(PTR_ERR(*auth_tok_key));
-		rc = -EINVAL;
+		rc = process_request_key_err(PTR_ERR(*auth_tok_key));
 		goto out;
 	}
 	(*auth_tok) = ecryptfs_get_key_payload_data(*auth_tok_key);
Index: linux-2.6/fs/ecryptfs/main.c
===================================================================
--- linux-2.6.orig/fs/ecryptfs/main.c	2008-06-05 13:44:20.363046095 -0500
+++ linux-2.6/fs/ecryptfs/main.c	2008-06-13 15:16:37.756983075 -0500
@@ -262,10 +262,11 @@ static int ecryptfs_init_global_auth_tok
 			       "session keyring for sig specified in mount "
 			       "option: [%s]\n", global_auth_tok->sig);
 			global_auth_tok->flags |= ECRYPTFS_AUTH_TOK_INVALID;
-			rc = 0;
+			goto out;
 		} else
 			global_auth_tok->flags &= ~ECRYPTFS_AUTH_TOK_INVALID;
 	}
+out:
 	return rc;
 }
 
@@ -430,7 +431,6 @@ static int ecryptfs_parse_options(struct
 		printk(KERN_WARNING "One or more global auth toks could not "
 		       "properly register; rc = [%d]\n", rc);
 	}
-	rc = 0;
 out:
 	return rc;
 }