From: Ard Biesheuvel <ardb@kernel.org>
To: linux-crypto@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>,
Herbert Xu <herbert@gondor.apana.org.au>,
Peter Zijlstra <peterz@infradead.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
linux-kernel@vger.kernel.org, Ard Biesheuvel <ardb@kernel.org>,
Eric Biggers <ebiggers@kernel.org>,
Mark Brown <broonie@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Will Deacon <will@kernel.org>, Dave Martin <dave.martin@arm.com>,
linux-arm-kernel@lists.infradead.org
Subject: [RFC PATCH 1/5] crypto: aead - disallow en/decrypt for non-task or non-softirq context
Date: Fri, 18 Dec 2020 18:01:02 +0100 [thread overview]
Message-ID: <20201218170106.23280-2-ardb@kernel.org> (raw)
In-Reply-To: <20201218170106.23280-1-ardb@kernel.org>
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@kernel.org>
---
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
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next prev parent reply other threads:[~2020-12-18 17:41 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-18 17:01 [RFC PATCH 0/5] running kernel mode SIMD with softirqs disabled Ard Biesheuvel
2020-12-18 17:01 ` Ard Biesheuvel [this message]
2020-12-18 17:01 ` [RFC PATCH 2/5] crypto: skcipher - disallow en/decrypt for non-task or non-softirq context Ard Biesheuvel
2020-12-18 17:01 ` [RFC PATCH 3/5] crypto: arm64/gcm-aes-ce - add NEON yield support Ard Biesheuvel
2020-12-18 17:01 ` [RFC PATCH 4/5] arm64: fpsimd: run kernel mode NEON with softirqs disabled Ard Biesheuvel
2021-01-19 16:00 ` Dave Martin
2021-01-19 16:29 ` Ard Biesheuvel
2021-01-20 15:44 ` Dave Martin
2021-02-15 18:30 ` Ard Biesheuvel
2020-12-18 17:01 ` [RFC PATCH 5/5] crypto: arm64/gcm-aes-ce - remove non-SIMD fallback path Ard Biesheuvel
2020-12-19 2:04 ` [RFC PATCH 0/5] running kernel mode SIMD with softirqs disabled Herbert Xu
2021-01-14 8:22 ` Ard Biesheuvel
2021-02-16 10:09 ` Peter Zijlstra
2021-02-16 10:35 ` Ard Biesheuvel
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