[dpdk-dev] [PATCH] crypto/openssl: fix usage of non constant time memcmp for mac and signature

Akhil Goyal akhil.goyal at nxp.com
Wed Jun 19 16:48:24 CEST 2019



> 
> 
> > -----Original Message-----
> > From: Kusztal, ArkadiuszX
> > Sent: Friday, May 31, 2019 7:59 AM
> > To: dev at dpdk.org
> > Cc: akhil.goyal at nxp.com; Trahe, Fiona <fiona.trahe at intel.com>; Doherty,
> Declan
> > <declan.doherty at intel.com>; Kusztal, ArkadiuszX
> <arkadiuszx.kusztal at intel.com>
> > Subject: [PATCH] crypto/openssl: fix usage of non constant time memcmp for
> mac and signature
> >
> > ANSI C memcmp is not constant time function per spec so it should
> > be avoided in cryptography usage.
> >
> > Fixes: d61f70b4c918 ("crypto/libcrypto: add driver for OpenSSL library")
> >
> > Signed-off-by: Arek Kusztal <arkadiuszx.kusztal at intel.com>
> > ---
> >  drivers/crypto/openssl/rte_openssl_pmd.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/crypto/openssl/rte_openssl_pmd.c
> b/drivers/crypto/openssl/rte_openssl_pmd.c
> > index 6504959..73ce383 100644
> > --- a/drivers/crypto/openssl/rte_openssl_pmd.c
> > +++ b/drivers/crypto/openssl/rte_openssl_pmd.c
> > @@ -1529,7 +1529,7 @@ process_openssl_auth_op(struct openssl_qp *qp,
> struct rte_crypto_op *op,
> >  	}
> >
> >  	if (sess->auth.operation == RTE_CRYPTO_AUTH_OP_VERIFY) {
> > -		if (memcmp(dst, op->sym->auth.digest.data,
> > +		if (CRYPTO_memcmp(dst, op->sym->auth.digest.data,
> >  				sess->auth.digest_length) != 0) {
> >  			op->status = RTE_CRYPTO_OP_STATUS_AUTH_FAILED;
> >  		}
> > @@ -1914,7 +1914,7 @@ process_openssl_rsa_op(struct rte_crypto_op *cop,
> >  				"Length of public_decrypt %d "
> >  				"length of message %zd\n",
> >  				ret, op->rsa.message.length);
> > -		if ((ret <= 0) || (memcmp(tmp, op->rsa.message.data,
> > +		if ((ret <= 0) || (CRYPTO_memcmp(tmp, op->rsa.message.data,
> >  				op->rsa.message.length))) {
> >  			OPENSSL_LOG(ERR, "RSA sign Verification failed");
> >  			cop->status = RTE_CRYPTO_OP_STATUS_ERROR;
> > --
> > 2.1.0
> Hadn't heard of that time const fn before so just read up on it - interesting.
> Acked-by: Fiona Trahe <fiona.trahe at intel.com>
> 
Modified the subject a bit.
Applied to dpdk-next-crypto

Thanks


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