linux-kernel - Re: [PATCH 1/3] crypto: properly handle null input and assoc data aead test vectors

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Date:	Thu, 23 Apr 2009 13:30:16 -0400
From:	Jarod Wilson <jarod@...hat.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
CC:	linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
	Neil Horman <nhorman@...driver.com>
Subject: Re: [PATCH 1/3] crypto: properly handle null input and assoc data
 aead test vectors

On 04/20/2009 02:23 AM, Herbert Xu wrote:
> On Wed, Apr 15, 2009 at 09:36:10AM -0400, Jarod Wilson wrote:
>> Currenty, if either input or associated data are null in an aead
>> test vector, we'll have random contents of the input and assoc
>> arrays. Similar to the iv, play it safe and zero out the contents.
>>
>> Signed-off-by: Jarod Wilson<jarod@...hat.com>
>
> This patch doesn't make sense unless you were getting a crash
> without it.
>
>> diff --git a/crypto/testmgr.c b/crypto/testmgr.c
>> index bfee6e9..a8bdcb3 100644
>> --- a/crypto/testmgr.c
>> +++ b/crypto/testmgr.c
>> @@ -314,8 +314,18 @@ static int test_aead(struct crypto_aead *tfm, int enc,
>>   			input = xbuf[0];
>>   			assoc = axbuf[0];
>>
>> -			memcpy(input, template[i].input, template[i].ilen);
>> -			memcpy(assoc, template[i].assoc, template[i].alen);
>> +			if (template[i].input)
>> +				memcpy(input, template[i].input,
>> +				       template[i].ilen);
>> +			else
>> +				memset(input, 0, MAX_IVLEN);
>
> If template[i].input was really NULL then the memcpy should crash.

I needed to do this for some extended testing elsewhere in 
similar-looking code, where input could indeed be NULL and I did 
encounter crashes, but its not reproduceable within tcrypt/testmgr 
itself, so indeed, not necessary here.

-- 
Jarod Wilson
jarod@...hat.com
--
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