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X.509: if signature is unsupported skip validation

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commit ef5b52a631f8c18353e80ccab8408b963305510c upstream.

When the hash algorithm for the signature is not available the digest size
is 0 and the signature in the certificate is marked as unsupported.

When validating a self-signed certificate, this needs to be checked,
because otherwise trying to validate the signature will fail with an
warning:

Loading compiled-in X.509 certificates
WARNING: CPU: 0 PID: 1 at crypto/rsa-pkcs1pad.c:537 \
pkcs1pad_verify+0x46/0x12c
...
Problem loading in-kernel X.509 certificate (-22)

Signed-off-by: Thore Sommer <public@thson.de>
Cc: stable@vger.kernel.org # v4.7+
Fixes: 6c2dc5ae4a ("X.509: Extract signature digest and make self-signed cert checks earlier")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thore Sommer 2023-08-15 14:29:42 +03:00 committed by Greg Kroah-Hartman
parent 4b8a938e32
commit c681d477c0
1 changed files with 5 additions and 0 deletions
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5
crypto/asymmetric_keys/x509_public_key.c
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@ -132,6 +132,11 @@ int x509_check_for_self_signed(struct x509_certificate *cert)
if (strcmp(cert->pub->pkey_algo, cert->sig->pkey_algo) != 0)
goto out;
if (cert->unsupported_sig) {
ret = 0;
goto out;
}
ret = public_key_verify_signature(cert->pub, cert->sig);
if (ret < 0) {
if (ret == -ENOPKG) {