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authorEric Biggers <ebiggers@google.com>2018-01-03 11:16:26 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-02-25 11:05:43 +0100
commitb392a53b11f325b30b7d54e575352a8cac4c300d (patch)
tree85b20e72a7e17f25431c9dab8865a9589c282a23 /crypto/mcryptd.c
parenteb9c7c7d9542a33011b1e217e5a283ebf94fac01 (diff)
crypto: hash - annotate algorithms taking optional key
commit a208fa8f33031b9e0aba44c7d1b7e68eb0cbd29e upstream. We need to consistently enforce that keyed hashes cannot be used without setting the key. To do this we need a reliable way to determine whether a given hash algorithm is keyed or not. AF_ALG currently does this by checking for the presence of a ->setkey() method. However, this is actually slightly broken because the CRC-32 algorithms implement ->setkey() but can also be used without a key. (The CRC-32 "key" is not actually a cryptographic key but rather represents the initial state. If not overridden, then a default initial state is used.) Prepare to fix this by introducing a flag CRYPTO_ALG_OPTIONAL_KEY which indicates that the algorithm has a ->setkey() method, but it is not required to be called. Then set it on all the CRC-32 algorithms. The same also applies to the Adler-32 implementation in Lustre. Also, the cryptd and mcryptd templates have to pass through the flag from their underlying algorithm. Cc: stable@vger.kernel.org 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>
Diffstat (limited to 'crypto/mcryptd.c')
-rw-r--r--crypto/mcryptd.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/crypto/mcryptd.c b/crypto/mcryptd.c
index 6e9389c8bfbd..7406ed0745be 100644
--- a/crypto/mcryptd.c
+++ b/crypto/mcryptd.c
@@ -516,10 +516,9 @@ static int mcryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb,
if (err)
goto out_free_inst;
- type = CRYPTO_ALG_ASYNC;
- if (alg->cra_flags & CRYPTO_ALG_INTERNAL)
- type |= CRYPTO_ALG_INTERNAL;
- inst->alg.halg.base.cra_flags = type;
+ inst->alg.halg.base.cra_flags = CRYPTO_ALG_ASYNC |
+ (alg->cra_flags & (CRYPTO_ALG_INTERNAL |
+ CRYPTO_ALG_OPTIONAL_KEY));
inst->alg.halg.digestsize = halg->digestsize;
inst->alg.halg.statesize = halg->statesize;