From: James Morris <james.l.morris@oracle.com>
To: Eric Biggers <ebiggers3@gmail.com>
Cc: keyrings@vger.kernel.org, David Howells <dhowells@redhat.com>,
linux-crypto@vger.kernel.org, Eric Biggers <ebiggers@google.com>
Subject: Re: [PATCH] pkcs7: fix check for self-signed certificate
Date: Mon, 27 Nov 2017 20:54:52 +1100 (AEDT) [thread overview]
Message-ID: <alpine.LFD.2.20.1711272054440.2808@localhost> (raw)
In-Reply-To: <20171127071942.26214-1-ebiggers3@gmail.com>
On Sun, 26 Nov 2017, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@google.com>
>
> pkcs7_validate_trust_one() used 'x509->next == x509' to identify a
> self-signed certificate. That's wrong; ->next is simply the link in the
> linked list of certificates in the PKCS#7 message. It should be
> checking ->signer instead. Fix it.
>
> Fortunately this didn't actually matter because when we re-visited
> 'x509' on the next iteration via 'x509->signer', it was already seen and
> not verified, so we returned -ENOKEY anyway.
>
> Signed-off-by: Eric Biggers <ebiggers@google.com>
> ---
> crypto/asymmetric_keys/pkcs7_trust.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/crypto/asymmetric_keys/pkcs7_trust.c b/crypto/asymmetric_keys/pkcs7_trust.c
> index f6a009d88a33..1f4e25f10049 100644
> --- a/crypto/asymmetric_keys/pkcs7_trust.c
> +++ b/crypto/asymmetric_keys/pkcs7_trust.c
> @@ -69,7 +69,7 @@ static int pkcs7_validate_trust_one(struct pkcs7_message *pkcs7,
> /* Self-signed certificates form roots of their own, and if we
> * don't know them, then we can't accept them.
> */
> - if (x509->next == x509) {
> + if (x509->signer == x509) {
> kleave(" = -ENOKEY [unknown self-signed]");
> return -ENOKEY;
> }
> --
Reviewed-by: James Morris <james.l.morris@oracle.com>
--
James Morris
<james.l.morris@oracle.com>
prev parent reply other threads:[~2017-11-27 9:55 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-27 7:19 [PATCH] pkcs7: fix check for self-signed certificate Eric Biggers
2017-11-27 9:54 ` James Morris [this message]
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