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crypto: rsa-pkcs1pad - only allow with rsa

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commit 9b30430ea356f237945e52f8a3a42158877bd5a9 upstream.

The pkcs1pad template can be instantiated with an arbitrary akcipher
algorithm, which doesn't make sense; it is specifically an RSA padding
scheme.  Make it check that the underlying algorithm really is RSA.

Fixes: 3d5b1ecdea ("crypto: rsa - RSA padding algorithm")
Cc: <stable@vger.kernel.org> # v4.5+
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eric Biggers
2022-01-18 16:13:02 -08:00
committed by Greg Kroah-Hartman
parent 27a6f495b6
commit c1db3f44f2
1 changed files with 5 additions and 0 deletions
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5
crypto/rsa-pkcs1pad.c
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@@ -621,6 +621,11 @@ static int pkcs1pad_create(struct crypto_template *tmpl, struct rtattr **tb)
rsa_alg = crypto_spawn_akcipher_alg(&ctx->spawn); rsa_alg = crypto_spawn_akcipher_alg(&ctx->spawn);
if (strcmp(rsa_alg->base.cra_name, "rsa") != 0) {
err = -EINVAL;
goto err_free_inst;
}
err = -ENAMETOOLONG; err = -ENAMETOOLONG;
hash_name = crypto_attr_alg_name(tb[2]); hash_name = crypto_attr_alg_name(tb[2]);
if (IS_ERR(hash_name)) { if (IS_ERR(hash_name)) {