linux-kernel - [PATCH v4 2/3] KEYS: trusted: Fix migratable=1 failing

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Message-Id: <20201013025156.111305-3-jarkko.sakkinen@linux.intel.com>
Date:   Tue, 13 Oct 2020 05:51:55 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     linux-integrity@...r.kernel.org
Cc:     David Howells <dhowells@...hat.com>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        James Bottomley <jejb@...ux.ibm.com>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        stable@...r.kernel.org, James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        David Safford <safford@...son.ibm.com>,
        keyrings@...r.kernel.org (open list:KEYS-TRUSTED),
        linux-security-module@...r.kernel.org (open list:SECURITY SUBSYSTEM),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v4 2/3] KEYS: trusted: Fix migratable=1 failing

Consider the following transcript:

$ keyctl add trusted kmk "new 32 blobauth=helloworld keyhandle=80000000 migratable=1" @u
add_key: Invalid argument

The documentation has the following description:

  migratable=   0|1 indicating permission to reseal to new PCR values,
                default 1 (resealing allowed)

The consequence is that "migratable=1" should succeed. Fix this by
allowing this condition to pass instead of return -EINVAL.

[*] Documentation/security/keys/trusted-encrypted.rst

Cc: stable@...r.kernel.org
Cc: "James E.J. Bottomley" <jejb@...ux.ibm.com>
Cc: Mimi Zohar <zohar@...ux.ibm.com>
Cc: David Howells <dhowells@...hat.com>
Fixes: d00a1c72f7f4 ("keys: add new trusted key-type")
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
---
 security/keys/trusted-keys/trusted_tpm1.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/security/keys/trusted-keys/trusted_tpm1.c b/security/keys/trusted-keys/trusted_tpm1.c
index c7b1701cdac5..7a937c3c5283 100644
--- a/security/keys/trusted-keys/trusted_tpm1.c
+++ b/security/keys/trusted-keys/trusted_tpm1.c
@@ -801,7 +801,7 @@ static int getoptions(char *c, struct trusted_key_payload *pay,
 		case Opt_migratable:
 			if (*args[0].from == '0')
 				pay->migratable = 0;
-			else
+			else if (*args[0].from != '1')
 				return -EINVAL;
 			break;
 		case Opt_pcrlock:
-- 
2.25.1