Changes from v1:
* removed the default implementation from set_pub_key: it is assumed that
an implementation must always have this callback defined as there are
no use case for an algorithm, which doesn't need a public key
Many akcipher implementations (like ECDSA) support only signature
verifications, so they don't have all callbacks defined.
Commit 78a0324f4a53 ("crypto: akcipher - default implementations for
request callbacks") introduced default callbacks for sign/verify
operations, which just return an error code.
However, these are not enough, because before calling sign the caller would
likely call set_priv_key first on the instantiated transform (as the
in-kernel testmgr does). This function does not have a default stub, so the
kernel crashes, when trying to set a private key on an akcipher, which
doesn't support signature generation.
I've noticed this, when trying to add a KAT vector for ECDSA signature to
the testmgr.
With this patch the testmgr returns an error in dmesg (as it should)
instead of crashing the kernel NULL ptr dereference.
Fixes: 78a0324f4a53 ("crypto: akcipher - default implementations for request callbacks")
Signed-off-by: Ignat Korchagin <[email protected]>
---
crypto/akcipher.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/crypto/akcipher.c b/crypto/akcipher.c
index f866085c8a4a..ab975a420e1e 100644
--- a/crypto/akcipher.c
+++ b/crypto/akcipher.c
@@ -120,6 +120,12 @@ static int akcipher_default_op(struct akcipher_request *req)
return -ENOSYS;
}
+static int akcipher_default_set_key(struct crypto_akcipher *tfm,
+ const void *key, unsigned int keylen)
+{
+ return -ENOSYS;
+}
+
int crypto_register_akcipher(struct akcipher_alg *alg)
{
struct crypto_alg *base = &alg->base;
@@ -132,6 +138,8 @@ int crypto_register_akcipher(struct akcipher_alg *alg)
alg->encrypt = akcipher_default_op;
if (!alg->decrypt)
alg->decrypt = akcipher_default_op;
+ if (!alg->set_priv_key)
+ alg->set_priv_key = akcipher_default_set_key;
akcipher_prepare_alg(alg);
return crypto_register_alg(base);
--
2.36.1
On Wed, Aug 31, 2022 at 07:37:06PM +0100, Ignat Korchagin wrote:
> Changes from v1:
> * removed the default implementation from set_pub_key: it is assumed that
> an implementation must always have this callback defined as there are
> no use case for an algorithm, which doesn't need a public key
>
> Many akcipher implementations (like ECDSA) support only signature
> verifications, so they don't have all callbacks defined.
>
> Commit 78a0324f4a53 ("crypto: akcipher - default implementations for
> request callbacks") introduced default callbacks for sign/verify
> operations, which just return an error code.
>
> However, these are not enough, because before calling sign the caller would
> likely call set_priv_key first on the instantiated transform (as the
> in-kernel testmgr does). This function does not have a default stub, so the
> kernel crashes, when trying to set a private key on an akcipher, which
> doesn't support signature generation.
>
> I've noticed this, when trying to add a KAT vector for ECDSA signature to
> the testmgr.
>
> With this patch the testmgr returns an error in dmesg (as it should)
> instead of crashing the kernel NULL ptr dereference.
>
> Fixes: 78a0324f4a53 ("crypto: akcipher - default implementations for request callbacks")
> Signed-off-by: Ignat Korchagin <[email protected]>
> ---
> crypto/akcipher.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
Patch applied. Thanks.
--
Email: Herbert Xu <[email protected]>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt