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| author | Eric Biggers <ebiggers@google.com> | 2020-07-09 23:20:39 -0700 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2020-07-16 21:49:08 +1000 |
| commit | b1ab682ba843fb0f99cb66969432c55bf8aa35b4 (patch) | |
| tree | 27934b74da3b079cd13216bf35e7b76f1f0b2102 /crypto/skcipher.c | |
| parent | 558cc15c0d3341a2aa80a2e0be1e2e8307efebee (diff) | |
| download | linux-crypto-b1ab682ba843fb0f99cb66969432c55bf8aa35b4.tar.gz linux-crypto-b1ab682ba843fb0f99cb66969432c55bf8aa35b4.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 4e20b8b65210 ("crypto: xts - Propagate NEED_FALLBACK bit")
commit 25fe465280e3 ("crypto: ctr - Propagate NEED_FALLBACK bit")
commit cf197f2b42c6 ("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/skcipher.c')
| -rw-r--r-- | crypto/skcipher.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/crypto/skcipher.c b/crypto/skcipher.c index 3b93a74a..467af525 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) |