RSA: Fix signature verification for shorter signatures (0b1568a4) · Commits · 戴 / test

gpg can produce a signature file where length of signature is less than the modulus size because the amount of space an MPI takes up is kept as low as possible by discarding leading zeros. This regularly happens for several modules during the build. Fix it by relaxing check in RSA verification code. Thanks to Tomas Mraz and Miloslav Trmac for help. Signed-off-by:

Milan Broz <mbroz@redhat.com> Signed-off-by:

David Howells <dhowells@redhat.com> Signed-off-by:

Rusty Russell <rusty@rustcorp.com.au>

crypto/asymmetric_keys/rsa.c

+11 −3

Original line number	Diff line number	Diff line
		@@ -224,15 +224,23 @@ static int RSA_verify_signature(const struct public_key *key,
		return -ENOTSUPP;

		/* (1) Check the signature size against the public key modulus size */
		k = (mpi_get_nbits(key->rsa.n) + 7) / 8;
		k = mpi_get_nbits(key->rsa.n);
		tsize = mpi_get_nbits(sig->rsa.s);

		tsize = (mpi_get_nbits(sig->rsa.s) + 7) / 8;
		/* According to RFC 4880 sec 3.2, length of MPI is computed starting
		* from most significant bit. So the RFC 3447 sec 8.2.2 size check
		* must be relaxed to conform with shorter signatures - so we fail here
		* only if signature length is longer than modulus size.
		*/
		pr_devel("step 1: k=%zu size(S)=%zu\n", k, tsize);
		if (tsize != k) {
		if (k < tsize) {
		ret = -EBADMSG;
		goto error;
		}

		/* Round up and convert to octets */
		k = (k + 7) / 8;

		/* (2b) Apply the RSAVP1 verification primitive to the public key */
		ret = RSAVP1(key, sig->rsa.s, &m);
		if (ret < 0)

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