linux-kernel - Re: Crypto test results unused?

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Date:	Mon, 28 Dec 2009 21:14:17 +0100
From:	Krzysztof Halasa <khc@...waw.pl>
To:	linux-crypto@...r.kernel.org
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: Crypto test results unused?

Krzysztof Halasa <khc@...waw.pl> writes:

> is the core crypto code supposed to "kill" algorithms which fail the
> test?
>
> On little-endian IXP4xx 3 hardware-assisted algorithms fail (due to
> apparently unrelated bug which I will take care of). It seems the kernel
> is still using these failing algorithms (my debugging code adds extra
> fields to the /proc output):
>
> alg: skcipher: Test 1 failed on encryption for ecb(des)-ixp4xx
> 00000000: 01 23 45 67 89 ab cd e7
> alg: skcipher: Test 1 failed on encryption for ecb(des3_ede)-ixp4xx
> 00000000: 73 6f 6d 65 64 61 74 61
> alg: skcipher: Test 1 failed on encryption for ecb(aes)-ixp4xx
> 00000000: 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee ff
>
> # grep 'ecb(des)-ixp4xx\|ecb(des3_ede)-ixp4xx\|ecb(aes)-ixp4xx' /proc/cryp
> to -A 6
> driver       : ecb(aes)-ixp4xx
> module       : ixp4xx_crypto
> priority     : 300
> refcnt       : 1
> flags        : 0x85
> ptr          : 0xbf020074
> selftest     : unknown
> ^^^^^^^^^^^^^^^^^^^^^^

I think probably crypto_alg_tested() should mark the failing algorithm
somehow?
void crypto_alg_tested(const char *name, int err)
{
	...
found:
	q->cra_flags |= CRYPTO_ALG_DEAD;
	alg = test->adult;

  >>>>>>>>>>>>> maybe here? if (err) mark_as_failed(alg); <<<<<<<<<<<<<<<<

	if (err || list_empty(&alg->cra_list))
		goto complete;

	alg->cra_flags |= CRYPTO_ALG_TESTED;
-- 
Krzysztof Halasa
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