linux-kernel - Re: [PATCH] Documentation: crypto: add info about "fips=" boot option

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Message-ID: <20210330050222.GA28431@gondor.apana.org.au>
Date:   Tue, 30 Mar 2021 16:02:22 +1100
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     linux-kernel@...r.kernel.org, Dexuan Cui <decui@...rosoft.com>,
        linux-crypto@...r.kernel.org, Eric Biggers <ebiggers@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org
Subject: Re: [PATCH] Documentation: crypto: add info about "fips=" boot option

On Mon, Mar 29, 2021 at 10:00:45PM -0700, Randy Dunlap wrote:
> On 3/29/21 9:37 PM, Herbert Xu wrote:
> > On Mon, Mar 29, 2021 at 09:00:01PM -0700, Randy Dunlap wrote:
> >>
> >> +			If fips_enabled = 1, some crypto tests are skipped.
> > 
> > I don't think any tests are skipped.  It does however disable
> > many algorithms by essentially failing them at the testing stage.
> 
> That statement was based on crypto/testmgr.c (in 4 places):
> 
> 		if (fips_enabled && template[i].fips_skip)
> 			continue;

By skipping the test, the algorithm effectively fails the self-test
and therefore is disabled.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt