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/simd.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'crypto/simd.c') diff --git a/crypto/simd.c b/crypto/simd.c index 56885af49c24..edaa479a1ec5 100644 --- a/crypto/simd.c +++ b/crypto/simd.c @@ -171,7 +171,8 @@ struct simd_skcipher_alg *simd_skcipher_create_compat(const char *algname, drvname) >= CRYPTO_MAX_ALG_NAME) goto out_free_salg; - alg->base.cra_flags = CRYPTO_ALG_ASYNC; + alg->base.cra_flags = CRYPTO_ALG_ASYNC | + (ialg->base.cra_flags & CRYPTO_ALG_INHERITED_FLAGS); alg->base.cra_priority = ialg->base.cra_priority; alg->base.cra_blocksize = ialg->base.cra_blocksize; alg->base.cra_alignmask = ialg->base.cra_alignmask; @@ -417,7 +418,8 @@ struct simd_aead_alg *simd_aead_create_compat(const char *algname, drvname) >= CRYPTO_MAX_ALG_NAME) goto out_free_salg; - alg->base.cra_flags = CRYPTO_ALG_ASYNC; + alg->base.cra_flags = CRYPTO_ALG_ASYNC | + (ialg->base.cra_flags & CRYPTO_ALG_INHERITED_FLAGS); alg->base.cra_priority = ialg->base.cra_priority; alg->base.cra_blocksize = ialg->base.cra_blocksize; alg->base.cra_alignmask = ialg->base.cra_alignmask; -- cgit v1.2.3