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From: Ard Biesheuvel <ardb@kernel.org>
To: linux-crypto@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, Ard Biesheuvel <ardb@kernel.org>,
	Dave Martin <dave.martin@arm.com>,
	Mark Brown <broonie@kernel.org>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	Eric Biggers <ebiggers@kernel.org>, Will Deacon <will@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Peter Zijlstra <peterz@infradead.org>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	Ingo Molnar <mingo@kernel.org>
Subject: [RFC PATCH 2/5] crypto: skcipher - disallow en/decrypt for non-task or non-softirq context
Date: Fri, 18 Dec 2020 18:01:03 +0100	[thread overview]
Message-ID: <20201218170106.23280-3-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
skcipher encrypt and decrypt routines from outside of task or softirq
context.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 crypto/skcipher.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/crypto/skcipher.c b/crypto/skcipher.c
index b4dae640de9f..d1a656d7d498 100644
--- a/crypto/skcipher.c
+++ b/crypto/skcipher.c
@@ -628,6 +628,11 @@ int crypto_skcipher_encrypt(struct skcipher_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_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
 		ret = -ENOKEY;
@@ -645,6 +650,11 @@ int crypto_skcipher_decrypt(struct skcipher_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_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
 		ret = -ENOKEY;
-- 
2.17.1


WARNING: multiple messages have this Message-ID (diff)
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 2/5] crypto: skcipher - disallow en/decrypt for non-task or non-softirq context
Date: Fri, 18 Dec 2020 18:01:03 +0100	[thread overview]
Message-ID: <20201218170106.23280-3-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
skcipher encrypt and decrypt routines from outside of task or softirq
context.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 crypto/skcipher.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/crypto/skcipher.c b/crypto/skcipher.c
index b4dae640de9f..d1a656d7d498 100644
--- a/crypto/skcipher.c
+++ b/crypto/skcipher.c
@@ -628,6 +628,11 @@ int crypto_skcipher_encrypt(struct skcipher_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_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
 		ret = -ENOKEY;
@@ -645,6 +650,11 @@ int crypto_skcipher_decrypt(struct skcipher_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_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
 		ret = -ENOKEY;
-- 
2.17.1


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  parent reply	other threads:[~2020-12-18 17:04 UTC|newest]

Thread overview: 28+ 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
2020-12-18 17:01 ` [RFC PATCH 1/5] crypto: aead - disallow en/decrypt for non-task or non-softirq context Ard Biesheuvel
2020-12-18 17:01   ` Ard Biesheuvel
2020-12-18 17:01 ` Ard Biesheuvel [this message]
2020-12-18 17:01   ` [RFC PATCH 2/5] crypto: skcipher " 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   ` Ard Biesheuvel
2020-12-18 17:01 ` [RFC PATCH 4/5] arm64: fpsimd: run kernel mode NEON with softirqs disabled Ard Biesheuvel
2020-12-18 17:01   ` Ard Biesheuvel
2021-01-19 16:00   ` Dave Martin
2021-01-19 16:00     ` Dave Martin
2021-01-19 16:29     ` Ard Biesheuvel
2021-01-19 16:29       ` Ard Biesheuvel
2021-01-20 15:44       ` Dave Martin
2021-01-20 15:44         ` Dave Martin
2021-02-15 18:30         ` Ard Biesheuvel
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
2020-12-18 17:01   ` Ard Biesheuvel
2020-12-19  2:04 ` [RFC PATCH 0/5] running kernel mode SIMD with softirqs disabled Herbert Xu
2020-12-19  2:04   ` Herbert Xu
2021-01-14  8:22   ` Ard Biesheuvel
2021-01-14  8:22     ` Ard Biesheuvel
2021-02-16 10:09 ` Peter Zijlstra
2021-02-16 10:09   ` Peter Zijlstra
2021-02-16 10:35   ` Ard Biesheuvel
2021-02-16 10:35     ` Ard Biesheuvel

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