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From: Ard Biesheuvel <ardb@kernel.org>
To: linux-crypto@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.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>, Andy Lutomirski <luto@kernel.org>
Subject: [PATCH v2 5/9] crypto: skcipher - disallow en/decrypt for non-task or non-softirq context
Date: Tue,  2 Mar 2021 10:01:14 +0100
Message-ID: <20210302090118.30666-6-ardb@kernel.org> (raw)
In-Reply-To: <20210302090118.30666-1-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 a15376245416..d1a2ba6eacbe 100644
--- a/crypto/skcipher.c
+++ b/crypto/skcipher.c
@@ -623,6 +623,11 @@ 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;
@@ -640,6 +645,11 @@ 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;
-- 
2.30.1


  parent reply index

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-02  9:01 [PATCH v2 0/9] running kernel mode SIMD with softirqs disabled Ard Biesheuvel
2021-03-02  9:01 ` [PATCH v2 1/9] arm64: assembler: remove conditional NEON yield macros Ard Biesheuvel
2021-03-30  9:52   ` Will Deacon
2021-04-12  8:39     ` Ard Biesheuvel
2021-03-02  9:01 ` [PATCH v2 2/9] arm64: assembler: introduce wxN aliases for wN registers Ard Biesheuvel
2021-03-30  9:59   ` Will Deacon
2021-03-02  9:01 ` [PATCH v2 3/9] arm64: fpsimd: run kernel mode NEON with softirqs disabled Ard Biesheuvel
2021-03-30 10:36   ` Will Deacon
2021-03-02  9:01 ` [PATCH v2 4/9] crypto: aead - disallow en/decrypt for non-task or non-softirq context Ard Biesheuvel
2021-03-02  9:01 ` Ard Biesheuvel [this message]
2021-03-02  9:01 ` [PATCH v2 6/9] crypto: arm64/gcm-aes-ce - remove non-SIMD fallback path Ard Biesheuvel
2021-03-02  9:01 ` [PATCH v2 7/9] crypto: arm64/aes-ccm " Ard Biesheuvel
2021-03-02  9:01 ` [PATCH v2 8/9] crypto: arm64/aes-ce - stop using SIMD helper for skciphers Ard Biesheuvel
2021-03-02  9:01 ` [PATCH v2 9/9] crypto: arm64/aes-neonbs " Ard Biesheuvel
2021-04-12 13:11 ` (subset) [PATCH v2 0/9] running kernel mode SIMD with softirqs disabled Catalin Marinas

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