In order to ensure that kernel mode SIMD routines will not need a scalar fallback if they run with softirqs disabled, disallow any use of the AEAD encrypt and decrypt routines from outside of task or softirq context. Signed-off-by: Ard Biesheuvel <ardb@xxxxxxxxxx> --- crypto/aead.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/crypto/aead.c b/crypto/aead.c index 16991095270d..b5304b3d3314 100644 --- a/crypto/aead.c +++ b/crypto/aead.c @@ -87,6 +87,11 @@ int crypto_aead_encrypt(struct aead_request *req) unsigned int cryptlen = req->cryptlen; int ret; + if (!(alg->cra_flags & CRYPTO_ALG_ASYNC) && + WARN_ONCE(!in_task() && !in_serving_softirq(), + "synchronous call from invalid context\n")) + return -EBUSY; + crypto_stats_get(alg); if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY) ret = -ENOKEY; @@ -104,6 +109,11 @@ int crypto_aead_decrypt(struct aead_request *req) unsigned int cryptlen = req->cryptlen; int ret; + if (!(alg->cra_flags & CRYPTO_ALG_ASYNC) && + WARN_ONCE(!in_task() && !in_serving_softirq(), + "synchronous call from invalid context\n")) + return -EBUSY; + crypto_stats_get(alg); if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY) ret = -ENOKEY; -- 2.17.1
