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/cmac.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'crypto/cmac.c') diff --git a/crypto/cmac.c b/crypto/cmac.c index 143a6544c873..df36be1efb81 100644 --- a/crypto/cmac.c +++ b/crypto/cmac.c @@ -225,9 +225,10 @@ static int cmac_create(struct crypto_template *tmpl, struct rtattr **tb) struct crypto_cipher_spawn *spawn; struct crypto_alg *alg; unsigned long alignmask; + u32 mask; int err; - err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH); + err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH, &mask); if (err) return err; @@ -237,7 +238,7 @@ static int cmac_create(struct crypto_template *tmpl, struct rtattr **tb) spawn = shash_instance_ctx(inst); err = crypto_grab_cipher(spawn, shash_crypto_instance(inst), - crypto_attr_alg_name(tb[1]), 0, 0); + crypto_attr_alg_name(tb[1]), 0, mask); if (err) goto err_free_inst; alg = crypto_spawn_cipher_alg(spawn); -- cgit v1.2.3