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crypto: algapi - use common mechanism for inheriting flags

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The flag CRYPTO_ALG_ASYNC is "inherited" in the sense that when a
template is instantiated, the template will have CRYPTO_ALG_ASYNC set if
any of the algorithms it uses has CRYPTO_ALG_ASYNC set.

We'd like to add a second flag (CRYPTO_ALG_ALLOCATES_MEMORY) that gets
"inherited" in the same way.  This is difficult because the handling of
CRYPTO_ALG_ASYNC is hardcoded everywhere.  Address this by:

  - Add CRYPTO_ALG_INHERITED_FLAGS, which contains the set of flags that
    have these inheritance semantics.

  - Add crypto_algt_inherited_mask(), for use by template ->create()
    methods.  It returns any of these flags that the user asked to be
    unset and thus must be passed in the 'mask' to crypto_grab_*().

  - Also modify crypto_check_attr_type() to handle computing the 'mask'
    so that most templates can just use this.

  - Make crypto_grab_*() propagate these flags to the template instance
    being created so that templates don't have to do this themselves.

Make crypto/simd.c propagate these flags too, since it "wraps" another
algorithm, similar to a template.

Based on a patch by Mikulas Patocka <mpatocka@redhat.com>
(https://lore.kernel.org/r/alpine.LRH.2.02.2006301414580.30526@file01.intranet.prod.int.rdu2.redhat.com).

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers
2020-07-09 23:20:38 -07:00
committed by Herbert Xu
parent 4688111e78
commit 7bcb2c99f8
23 changed files with 153 additions and 234 deletions
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23
include/crypto/algapi.h
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@@ -116,7 +116,7 @@ struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
void *crypto_spawn_tfm2(struct crypto_spawn *spawn);
struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb);
int crypto_check_attr_type(struct rtattr **tb, u32 type);
int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret);
const char *crypto_attr_alg_name(struct rtattr *rta);
int crypto_attr_u32(struct rtattr *rta, u32 *num);
int crypto_inst_setname(struct crypto_instance *inst, const char *name,
@@ -235,18 +235,27 @@ static inline struct crypto_async_request *crypto_get_backlog(
container_of(queue->backlog, struct crypto_async_request, list);
}
static inline int crypto_requires_off(u32 type, u32 mask, u32 off)
static inline u32 crypto_requires_off(struct crypto_attr_type *algt, u32 off)
{
return (type ^ off) & mask & off;
return (algt->type ^ off) & algt->mask & off;
}
/*
* Returns CRYPTO_ALG_ASYNC if type/mask requires the use of sync algorithms.
* Otherwise returns zero.
* When an algorithm uses another algorithm (e.g., if it's an instance of a
* template), these are the flags that should always be set on the "outer"
* algorithm if any "inner" algorithm has them set.
*/
static inline int crypto_requires_sync(u32 type, u32 mask)
#define CRYPTO_ALG_INHERITED_FLAGS CRYPTO_ALG_ASYNC
/*
* Given the type and mask that specify the flags restrictions on a template
* instance being created, return the mask that should be passed to
* crypto_grab_*() (along with type=0) to honor any request the user made to
* have any of the CRYPTO_ALG_INHERITED_FLAGS clear.
*/
static inline u32 crypto_algt_inherited_mask(struct crypto_attr_type *algt)
{
return crypto_requires_off(type, mask, CRYPTO_ALG_ASYNC);
return crypto_requires_off(algt, CRYPTO_ALG_INHERITED_FLAGS);
}
noinline unsigned long __crypto_memneq(const void *a, const void *b, size_t size);