linux-kernel - Re: [PATCH v3 1/3] x509: Detect sm2 keys by their parameters OID

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Date:   Tue, 2 Feb 2021 17:16:58 +0200
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Stefan Berger <stefanb@...ux.ibm.com>
Cc:     Stefan Berger <stefanb@...ux.vnet.ibm.com>, dhowells@...hat.com,
        keyrings@...r.kernel.org, linux-kernel@...r.kernel.org,
        herbert@...dor.apana.org.au, davem@...emloft.net,
        linux-crypto@...r.kernel.org, patrick@...terwijk.org
Subject: Re: [PATCH v3 1/3] x509: Detect sm2 keys by their parameters OID

On Sat, Jan 30, 2021 at 09:57:40PM -0500, Stefan Berger wrote:
> On 1/30/21 4:26 PM, Jarkko Sakkinen wrote:
> > On Wed, 2021-01-27 at 07:33 -0500, Stefan Berger wrote:
> > > From: Stefan Berger <stefanb@...ux.ibm.com>
> > > 
> > > Detect whether a key is an sm2 type of key by its OID in the parameters
> > > array rather than assuming that everything under OID_id_ecPublicKey
> > > is sm2, which is not the case.
> > > 
> > > Signed-off-by: Stefan Berger <stefanb@...ux.ibm.com>
> > > ---
> > >   crypto/asymmetric_keys/x509_cert_parser.c | 13 ++++++++++++-
> > >   1 file changed, 12 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/crypto/asymmetric_keys/x509_cert_parser.c b/crypto/asymmetric_keys/x509_cert_parser.c
> > > index 52c9b455fc7d..4643fe5ed69a 100644
> > > --- a/crypto/asymmetric_keys/x509_cert_parser.c
> > > +++ b/crypto/asymmetric_keys/x509_cert_parser.c
> > > @@ -459,6 +459,7 @@ int x509_extract_key_data(void *context, size_t hdrlen,
> > >                            const void *value, size_t vlen)
> > >   {
> > >          struct x509_parse_context *ctx = context;
> > > +       enum OID oid;
> > >          ctx->key_algo = ctx->last_oid;
> > >          switch (ctx->last_oid) {
> > > @@ -470,7 +471,17 @@ int x509_extract_key_data(void *context, size_t hdrlen,
> > >                  ctx->cert->pub->pkey_algo = "ecrdsa";
> > >                  break;
> > >          case OID_id_ecPublicKey:
> > > -               ctx->cert->pub->pkey_algo = "sm2";
> > > +               if (ctx->params_size < 2)
> > Either a named constant, or at least a comment instead of just '2'.
> 
> 
> I will look at the 2 entries whether they contain the expected values:
> ASN1_OID and length
> 
> Thanks!
> 
>    Stefan

Just add inline comment that explains that.

/Jarkko