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2abc9c246e
Most callers of public_key_verify_signature(), including most indirect callers via verify_signature() as well as pkcs7_verify_sig_chain(), don't check that public_key_signature::pkey_algo matches public_key::pkey_algo. These should always match. However, a malicious signature could intentionally declare an unintended algorithm. It is essential that such signatures be rejected outright, or that the algorithm of the *key* be used -- not the algorithm of the signature as that would allow attackers to choose the algorithm used. Currently, public_key_verify_signature() correctly uses the key's algorithm when deciding which akcipher to allocate. That's good. However, it uses the signature's algorithm when deciding whether to do the first step of SM2, which is incorrect. Also, v4.19 and older kernels used the signature's algorithm for the entire process. Prevent such errors by making public_key_verify_signature() enforce that the signature's algorithm (if given) matches the key's algorithm. Also remove two checks of this done by callers, which are now redundant. Cc: stable@vger.kernel.org Tested-by: Stefan Berger <stefanb@linux.ibm.com> Tested-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com> Signed-off-by: Eric Biggers <ebiggers@google.com> Reviewed-by: Vitaly Chikunov <vt@altlinux.org> Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org> Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org> |
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| .. | ||
| asymmetric_keys.h | ||
| asymmetric_type.c | ||
| Kconfig | ||
| Makefile | ||
| mscode.asn1 | ||
| mscode_parser.c | ||
| pkcs7.asn1 | ||
| pkcs7_key_type.c | ||
| pkcs7_parser.c | ||
| pkcs7_parser.h | ||
| pkcs7_trust.c | ||
| pkcs7_verify.c | ||
| pkcs8.asn1 | ||
| pkcs8_parser.c | ||
| public_key.c | ||
| restrict.c | ||
| signature.c | ||
| verify_pefile.c | ||
| verify_pefile.h | ||
| x509.asn1 | ||
| x509_akid.asn1 | ||
| x509_cert_parser.c | ||
| x509_parser.h | ||
| x509_public_key.c | ||