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From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To: linux-integrity@vger.kernel.org, stable@vger.kernel.org,
	David Howells <dhowells@redhat.com>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	"David S. Miller" <davem@davemloft.net>,
	"open list:ASYMMETRIC KEYS" <keyrings@vger.kernel.org>,
	"open list:CRYPTO API" <linux-crypto@vger.kernel.org>,
	open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] KEYS: asym_tpm: Switch to get_random_bytes()
Date: Tue, 1 Oct 2019 23:54:45 +0300	[thread overview]
Message-ID: <20191001205445.GC26709@linux.intel.com> (raw)
In-Reply-To: <20190928180559.jivt5zlisr43fnva@cantor>

On Sat, Sep 28, 2019 at 11:05:59AM -0700, Jerry Snitselaar wrote:
> On Thu Sep 26 19, Jarkko Sakkinen wrote:
> > Only the kernel random pool should be used for generating random numbers.
> > TPM contributes to that pool among the other sources of entropy. In here it
> > is not, agreed, absolutely critical because TPM is what is trusted anyway
> > but in order to remove tpm_get_random() we need to first remove all the > > call sites.  > > 
> > Cc: stable@vger.kernel.org
> > Fixes: 0c36264aa1d5 ("KEYS: asym_tpm: Add loadkey2 and flushspecific [ver #2]")
> > Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> > ---
> > crypto/asymmetric_keys/asym_tpm.c | 7 ++-----
> > 1 file changed, 2 insertions(+), 5 deletions(-)
> > 
> > diff --git a/crypto/asymmetric_keys/asym_tpm.c b/crypto/asymmetric_keys/asym_tpm.c
> > index 76d2ce3a1b5b..c14b8d186e93 100644
> > --- a/crypto/asymmetric_keys/asym_tpm.c
> > +++ b/crypto/asymmetric_keys/asym_tpm.c
> > @@ -6,6 +6,7 @@
> > #include <linux/kernel.h>
> > #include <linux/seq_file.h>
> > #include <linux/scatterlist.h>
> > +#include <linux/random.h>
> > #include <linux/tpm.h>
> > #include <linux/tpm_command.h>
> > #include <crypto/akcipher.h>
> > @@ -54,11 +55,7 @@ static int tpm_loadkey2(struct tpm_buf *tb,
> > 	}
> > 
> > 	/* generate odd nonce */
> > -	ret = tpm_get_random(NULL, nonceodd, TPM_NONCE_SIZE);
> > -	if (ret < 0) {
> > -		pr_info("tpm_get_random failed (%d)\n", ret);
> > -		return ret;
> > -	}
> > +	get_random_bytes(nonceodd, TPM_NONCE_SIZE);
> > 
> > 	/* calculate authorization HMAC value */
> > 	ret = TSS_authhmac(authdata, keyauth, SHA1_DIGEST_SIZE, enonce,
> > -- 
> > 2.20.1
> > 
> 
> Should tpm_unbind and tpm_sign in asym_tpm.c be switched as well then?

Without doubt. Thanks. I'll send an update soon.

/Jarkko

  reply	other threads:[~2019-10-01 20:54 UTC|newest]

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-26 17:16 Jarkko Sakkinen
2019-09-28 18:05 ` Jerry Snitselaar
2019-10-01 20:54   ` Jarkko Sakkinen [this message]
2019-10-02 14:00 ` Mimi Zohar
2019-10-03 11:41   ` Jarkko Sakkinen
2019-10-03 11:43     ` Jarkko Sakkinen
2019-10-03 13:02     ` Mimi Zohar
2019-10-03 17:58       ` Jarkko Sakkinen
2019-10-03 18:53         ` Mimi Zohar
2019-10-03 21:51           ` Jarkko Sakkinen
2019-10-03 21:57             ` Jarkko Sakkinen
2019-10-03 22:08               ` Mimi Zohar
2019-10-03 23:59                 ` James Bottomley
2019-10-04 18:22                   ` Jarkko Sakkinen
2019-10-04 18:24                     ` James Bottomley
2019-10-04 18:33                       ` Jerry Snitselaar
2019-10-04 18:42                         ` James Bottomley
2019-10-04 20:07                           ` Jerry Snitselaar
2019-10-04 20:11                             ` Jerry Snitselaar
2019-10-04 22:11                               ` James Bottomley
2019-10-06  0:38                                 ` Mimi Zohar
2019-10-06 23:52                                   ` Jarkko Sakkinen
2019-10-07 18:08                                     ` Mimi Zohar
2019-10-04 18:20                 ` Jarkko Sakkinen
2019-10-03 22:10               ` Jarkko Sakkinen
2019-10-04 13:26           ` Safford, David (GE Global Research, US)
2019-10-04 18:27             ` Jarkko Sakkinen
2019-10-04 18:30               ` Jarkko Sakkinen
2019-10-04 19:56               ` Safford, David (GE Global Research, US)
2019-10-07  0:05                 ` Jarkko Sakkinen
2019-10-07 22:13                   ` Ken Goldman
2019-10-08 23:49                     ` Jarkko Sakkinen
2019-10-08 23:53                       ` Jarkko Sakkinen
2019-10-09  7:10                         ` Pascal Van Leeuwen
2019-10-09  7:33                         ` Jarkko Sakkinen
2019-10-09  7:41                           ` Jarkko Sakkinen
2019-10-09  8:09                             ` Pascal Van Leeuwen
2019-10-14 19:11                               ` Jarkko Sakkinen
2019-10-09  8:02                           ` Pascal Van Leeuwen
2019-10-09 12:11                         ` Safford, David (GE Global Research, US)
2019-10-14 19:00                           ` Jarkko Sakkinen
2019-10-14 19:29                             ` Jarkko Sakkinen
2019-10-14 19:29                             ` James Bottomley
2019-10-16 11:00                               ` Jarkko Sakkinen
2019-10-16 12:34                                 ` James Bottomley
2019-10-16 16:25                                   ` Jarkko Sakkinen
2019-10-16 19:10                                     ` James Bottomley
2019-10-17 12:52                                       ` Sumit Garg
2019-10-17 12:58                                         ` James Bottomley
2019-10-17 18:04                                       ` Jarkko Sakkinen
2019-10-21 11:39                                         ` Jarkko Sakkinen
2019-10-29  8:42                                           ` Jarkko Sakkinen
2019-10-29 14:58                                             ` James Bottomley
2019-10-31 21:03                                               ` Jarkko Sakkinen
2019-10-18  7:32                                   ` Janne Karhunen
2019-10-03 18:02       ` Jarkko Sakkinen
2019-10-03 18:15         ` Jarkko Sakkinen
2019-10-07 10:33     ` Janne Karhunen

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