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author | Ignat Korchagin <ignat@cloudflare.com> | 2022-08-31 21:37:06 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-10-26 14:25:42 +0300 |
commit | a1354bdd191d533211b7cb723aa76a66f516f197 (patch) | |
tree | a63b1fe10f092ab2164e31cfd6f13c7680ec6781 /crypto/akcipher.c | |
parent | 2fee0dbfaeaaa4bda04279ce772c4572b1429d04 (diff) | |
download | linux-a1354bdd191d533211b7cb723aa76a66f516f197.tar.xz |
crypto: akcipher - default implementation for setting a private key
[ Upstream commit bc155c6c188c2f0c5749993b1405673d25a80389 ]
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 <ignat@cloudflare.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'crypto/akcipher.c')
-rw-r--r-- | crypto/akcipher.c | 8 |
1 files changed, 8 insertions, 0 deletions
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); |