Patch "s390/crypto: Extend key length check for AES-XTS in fips mode." has been added to the 4.9-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    s390/crypto: Extend key length check for AES-XTS in fips mode.

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     s390-crypto-extend-key-length-check-for-aes-xts-in-fips-mode.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Mon Nov  6 10:07:36 CET 2017
From: Harald Freudenberger <freude@linux.vnet.ibm.com>
Date: Sat, 7 Oct 2017 22:36:57 +0000
Subject: s390/crypto: Extend key length check for AES-XTS in fips mode.

From: Harald Freudenberger <freude@linux.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@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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;


Patches currently in stable-queue which might be from freude@linux.vnet.ibm.com are

queue-4.9/s390-crypto-extend-key-length-check-for-aes-xts-in-fips-mode.patch
queue-4.9/s390-prng-adjust-generation-of-entropy-to-produce-real-256-bits.patch