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/xts.c | 17 +++++------------ 1 file changed, 5 insertions(+), 12 deletions(-) (limited to 'crypto/xts.c') diff --git a/crypto/xts.c b/crypto/xts.c index 3565f3b863a6..35a30610569b 100644 --- a/crypto/xts.c +++ b/crypto/xts.c @@ -331,19 +331,17 @@ static void crypto_xts_free(struct skcipher_instance *inst) static int create(struct crypto_template *tmpl, struct rtattr **tb) { struct skcipher_instance *inst; - struct crypto_attr_type *algt; struct xts_instance_ctx *ctx; struct skcipher_alg *alg; const char *cipher_name; u32 mask; int err; - algt = crypto_get_attr_type(tb); - if (IS_ERR(algt)) - return PTR_ERR(algt); - - if ((algt->type ^ CRYPTO_ALG_TYPE_SKCIPHER) & algt->mask) - return -EINVAL; + err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SKCIPHER, &mask); + if (err) + return err; + mask |= crypto_requires_off(crypto_get_attr_type(tb), + CRYPTO_ALG_NEED_FALLBACK); cipher_name = crypto_attr_alg_name(tb[1]); if (IS_ERR(cipher_name)) @@ -355,10 +353,6 @@ static int create(struct crypto_template *tmpl, struct rtattr **tb) ctx = skcipher_instance_ctx(inst); - mask = crypto_requires_off(algt->type, algt->mask, - CRYPTO_ALG_NEED_FALLBACK | - CRYPTO_ALG_ASYNC); - err = crypto_grab_skcipher(&ctx->spawn, skcipher_crypto_instance(inst), cipher_name, 0, mask); if (err == -ENOENT) { @@ -415,7 +409,6 @@ static int create(struct crypto_template *tmpl, struct rtattr **tb) } else goto err_free_inst; - inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC; inst->alg.base.cra_priority = alg->base.cra_priority; inst->alg.base.cra_blocksize = XTS_BLOCK_SIZE; inst->alg.base.cra_alignmask = alg->base.cra_alignmask | -- cgit v1.2.3-58-ga151