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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
Download patch file Download diff file Expand all files Collapse all files

21
crypto/algapi.c
View file

@ -690,6 +690,8 @@ int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst,
spawn->mask = mask;
spawn->next = inst->spawns;
inst->spawns = spawn;
inst->alg.cra_flags |=
(alg->cra_flags & CRYPTO_ALG_INHERITED_FLAGS);
err = 0;
}
up_write(&crypto_alg_sem);
@ -816,7 +818,23 @@ struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
}
EXPORT_SYMBOL_GPL(crypto_get_attr_type);
int crypto_check_attr_type(struct rtattr **tb, u32 type)
/**
* crypto_check_attr_type() - check algorithm type and compute inherited mask
* @tb: the template parameters
* @type: the algorithm type the template would be instantiated as
* @mask_ret: (output) the mask that should be passed to crypto_grab_*()
* to restrict the flags of any inner algorithms
*
* Validate that the algorithm type the user requested is compatible with the
* one the template would actually be instantiated as. E.g., if the user is
* doing crypto_alloc_shash("cbc(aes)", ...), this would return an error because
* the "cbc" template creates an "skcipher" algorithm, not an "shash" algorithm.
*
* Also compute the mask to use to restrict the flags of any inner algorithms.
*
* Return: 0 on success; -errno on failure
*/
int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret)
{
struct crypto_attr_type *algt;
@ -827,6 +845,7 @@ int crypto_check_attr_type(struct rtattr **tb, u32 type)
if ((algt->type ^ type) & algt->mask)
return -EINVAL;
*mask_ret = crypto_algt_inherited_mask(algt);
return 0;
}
EXPORT_SYMBOL_GPL(crypto_check_attr_type);