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authorEric Biggers <ebiggers@google.com>2020-07-10 09:20:39 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2020-07-16 14:49:08 +0300
commit2eb27c11937ee9984c04b75d213a737291c5f58c (patch)
tree1665e908ce8a0e7e153fe9f77b2ddca77867c7dc /crypto
parent7bcb2c99f8ed032cfb3f5596b4dccac6b1f501df (diff)
downloadlinux-2eb27c11937ee9984c04b75d213a737291c5f58c.tar.xz
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.c2
-rw-r--r--crypto/skcipher.c2
-rw-r--r--crypto/xts.c2
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))