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| author | Eric Biggers <ebiggers@google.com> | 2020-07-10 08:20:39 +0200 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2020-07-16 13:49:08 +0200 |
| commit | 2eb27c11937ee9984c04b75d213a737291c5f58c (patch) | |
| tree | 1665e908ce8a0e7e153fe9f77b2ddca77867c7dc /crypto | |
| parent | crypto: algapi - use common mechanism for inheriting flags (diff) | |
| download | linux-2eb27c11937ee9984c04b75d213a737291c5f58c.tar.xz linux-2eb27c11937ee9984c04b75d213a737291c5f58c.zip | |
crypto: algapi - add NEED_FALLBACK to INHERITED_FLAGS
CRYPTO_ALG_NEED_FALLBACK is handled inconsistently. When it's requested
to be clear, some templates propagate that request to child algorithms,
while others don't.
It's apparently desired for NEED_FALLBACK to be propagated, to avoid
deadlocks where a module tries to load itself while it's being
initialized, and to avoid unnecessarily complex fallback chains where we
have e.g. cbc-aes-$driver falling back to cbc(aes-$driver) where
aes-$driver itself falls back to aes-generic, instead of cbc-aes-$driver
simply falling back to cbc(aes-generic). There have been a number of
fixes to this effect:
commit 89027579bc6c ("crypto: xts - Propagate NEED_FALLBACK bit")
commit d2c2a85cfe82 ("crypto: ctr - Propagate NEED_FALLBACK bit")
commit e6c2e65c70a6 ("crypto: cbc - Propagate NEED_FALLBACK bit")
But it seems that other templates can have the same problems too.
To avoid this whack-a-mole, just add NEED_FALLBACK to INHERITED_FLAGS so
that it's always inherited.
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto')
| -rw-r--r-- | crypto/ctr.c | 2 | ||||
| -rw-r--r-- | crypto/skcipher.c | 2 | ||||
| -rw-r--r-- | crypto/xts.c | 2 |
3 files changed, 0 insertions, 6 deletions
diff --git a/crypto/ctr.c b/crypto/ctr.c index ae8d88c715d6..c39fcffba27f 100644 --- a/crypto/ctr.c +++ b/crypto/ctr.c @@ -265,8 +265,6 @@ static int crypto_rfc3686_create(struct crypto_template *tmpl, err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SKCIPHER, &mask); if (err) return err; - mask |= crypto_requires_off(crypto_get_attr_type(tb), - CRYPTO_ALG_NEED_FALLBACK); inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); if (!inst) diff --git a/crypto/skcipher.c b/crypto/skcipher.c index 3b93a74ad124..467af525848a 100644 --- a/crypto/skcipher.c +++ b/crypto/skcipher.c @@ -943,8 +943,6 @@ struct skcipher_instance *skcipher_alloc_instance_simple( err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SKCIPHER, &mask); if (err) return ERR_PTR(err); - mask |= crypto_requires_off(crypto_get_attr_type(tb), - CRYPTO_ALG_NEED_FALLBACK); inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); if (!inst) diff --git a/crypto/xts.c b/crypto/xts.c index 35a30610569b..9a7adab6c3e1 100644 --- a/crypto/xts.c +++ b/crypto/xts.c @@ -340,8 +340,6 @@ static int create(struct crypto_template *tmpl, struct rtattr **tb) err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SKCIPHER, &mask); if (err) return err; - mask |= crypto_requires_off(crypto_get_attr_type(tb), - CRYPTO_ALG_NEED_FALLBACK); cipher_name = crypto_attr_alg_name(tb[1]); if (IS_ERR(cipher_name)) |