From 7bcb2c99f8ed032cfb3f5596b4dccac6b1f501df Mon Sep 17 00:00:00 2001 From: Eric Biggers Date: Thu, 9 Jul 2020 23:20:38 -0700 Subject: crypto: algapi - use common mechanism for inheriting flags 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 (https://lore.kernel.org/r/alpine.LRH.2.02.2006301414580.30526@file01.intranet.prod.int.rdu2.redhat.com). Signed-off-by: Eric Biggers Signed-off-by: Herbert Xu --- crypto/chacha20poly1305.c | 14 +++----------- 1 file changed, 3 insertions(+), 11 deletions(-) (limited to 'crypto/chacha20poly1305.c') diff --git a/crypto/chacha20poly1305.c b/crypto/chacha20poly1305.c index ccaea5cb66d1..97bbb135e9a6 100644 --- a/crypto/chacha20poly1305.c +++ b/crypto/chacha20poly1305.c @@ -555,7 +555,6 @@ static void chachapoly_free(struct aead_instance *inst) static int chachapoly_create(struct crypto_template *tmpl, struct rtattr **tb, const char *name, unsigned int ivsize) { - struct crypto_attr_type *algt; u32 mask; struct aead_instance *inst; struct chachapoly_instance_ctx *ctx; @@ -566,14 +565,9 @@ static int chachapoly_create(struct crypto_template *tmpl, struct rtattr **tb, if (ivsize > CHACHAPOLY_IV_SIZE) return -EINVAL; - algt = crypto_get_attr_type(tb); - if (IS_ERR(algt)) - return PTR_ERR(algt); - - if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) - return -EINVAL; - - mask = crypto_requires_sync(algt->type, algt->mask); + err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask); + if (err) + return err; inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); if (!inst) @@ -613,8 +607,6 @@ static int chachapoly_create(struct crypto_template *tmpl, struct rtattr **tb, poly->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME) goto err_free_inst; - inst->alg.base.cra_flags = (chacha->base.cra_flags | - poly->base.cra_flags) & CRYPTO_ALG_ASYNC; inst->alg.base.cra_priority = (chacha->base.cra_priority + poly->base.cra_priority) / 2; inst->alg.base.cra_blocksize = 1; -- cgit