linux-kernel - [PATCH 4.9 61/67] s390/crypto: Extend key length check for AES-XTS in fips mode.

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Message-Id: <20171106091307.829922513@linuxfoundation.org>
Date:   Mon,  6 Nov 2017 10:44:24 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Harald Freudenberger <freude@...ux.vnet.ibm.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.9 61/67] s390/crypto: Extend key length check for AES-XTS in fips mode.

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Harald Freudenberger <freude@...ux.vnet.ibm.com>


[ Upstream commit a4f2779ecf2f42b0997fedef6fd20a931c40a3e3 ]

In fips mode only xts keys with 128 bit or 125 bit are allowed.
This fix extends the xts_aes_set_key function to check for these
valid key lengths in fips mode.

Signed-off-by: Harald Freudenberger <freude@...ux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@...ibm.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/s390/crypto/aes_s390.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/arch/s390/crypto/aes_s390.c
+++ b/arch/s390/crypto/aes_s390.c
@@ -28,6 +28,7 @@
 #include <linux/cpufeature.h>
 #include <linux/init.h>
 #include <linux/spinlock.h>
+#include <linux/fips.h>
 #include <crypto/xts.h>
 #include <asm/cpacf.h>
 
@@ -501,6 +502,12 @@ static int xts_aes_set_key(struct crypto
 	if (err)
 		return err;
 
+	/* In fips mode only 128 bit or 256 bit keys are valid */
+	if (fips_enabled && key_len != 32 && key_len != 64) {
+		tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
+		return -EINVAL;
+	}
+
 	/* Pick the correct function code based on the key length */
 	fc = (key_len == 32) ? CPACF_KM_XTS_128 :
 	     (key_len == 64) ? CPACF_KM_XTS_256 : 0;