Re: gcm-aes-ccp self-tests failure

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On 7/2/19 11:06 AM, Eric Biggers wrote:
> Hi Tom and Gary,
> 
> On latest cryptodev tree, I'm seeing the following self-test failure after I
> built a kernel with the AMD CCP driver and crypto self-tests enabled, and booted
> it on system with a Ryzen processor ("Threadripper 1950X"):
> 
> [    4.378985] alg: aead: gcm-aes-ccp encryption test failed (wrong result) on test vector 2, cfg="two even aligned splits"
> 
> i.e., in some cases the AES-GCM implementation produces the wrong ciphertext
> and/or authentication tag.
> 
> Is this is a known issue?  When will it be fixed?
> 
> The potentially relevant bits of my Kconfig are:
> 
> 	CONFIG_CRYPTO_AES=y
> 	CONFIG_CRYPTO_GCM=y
> 	CONFIG_CRYPTO_DEV_CCP=y
> 	CONFIG_CRYPTO_DEV_CCP_DD=y
> 	CONFIG_CRYPTO_DEV_SP_CCP=y
> 	CONFIG_CRYPTO_DEV_CCP_CRYPTO=y
> 	CONFIG_CRYPTO_DEV_SP_PSP=y
> 	# CONFIG_CRYPTO_MANAGER_DISABLE_TESTS is not set
> 	CONFIG_DEBUG_KERNEL=y
> 	CONFIG_CRYPTO_MANAGER_EXTRA_TESTS=y
> 
> - Eric
> 

Yes, this is a known problem. We have no estimate on a fix at this time. 
I need to light a fire under someone now.

grh




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