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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 | 2eb27c11937ee9984c04b75d213a737291c5f58c (patch) | |
| tree | 1665e908ce8a0e7e153fe9f77b2ddca77867c7dc /include/crypto/algapi.h | |
| parent | crypto: algapi - use common mechanism for inheriting flags (diff) | |
| download | linux-dev-2eb27c11937ee9984c04b75d213a737291c5f58c.tar.xz linux-dev-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 'include/crypto/algapi.h')
| -rw-r--r-- | include/crypto/algapi.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/crypto/algapi.h b/include/crypto/algapi.h index da64c37482b4..22cf4d80959f 100644 --- a/include/crypto/algapi.h +++ b/include/crypto/algapi.h @@ -245,7 +245,8 @@ static inline u32 crypto_requires_off(struct crypto_attr_type *algt, u32 off) * template), these are the flags that should always be set on the "outer" * algorithm if any "inner" algorithm has them set. */ -#define CRYPTO_ALG_INHERITED_FLAGS CRYPTO_ALG_ASYNC +#define CRYPTO_ALG_INHERITED_FLAGS \ + (CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK) /* * Given the type and mask that specify the flags restrictions on a template |