From: Ard Biesheuvel <ardb@kernel.org> To: linux-crypto@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, ebiggers@kernel.org, herbert@gondor.apana.org.au, will@kernel.org, kernel-team@android.com, Ard Biesheuvel <ardb@kernel.org> Subject: [PATCH v3 3/7] crypto: skcipher - disallow en/decrypt for non-task or non-softirq context Date: Wed, 12 May 2021 20:44:35 +0200 [thread overview] Message-ID: <20210512184439.8778-4-ardb@kernel.org> (raw) In-Reply-To: <20210512184439.8778-1-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 93fdacf49697..9bce5350008b 100644 --- a/crypto/skcipher.c +++ b/crypto/skcipher.c @@ -625,6 +625,11 @@ 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; @@ -642,6 +647,11 @@ 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; -- 2.20.1
WARNING: multiple messages have this Message-ID (diff)
From: Ard Biesheuvel <ardb@kernel.org> To: linux-crypto@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, ebiggers@kernel.org, herbert@gondor.apana.org.au, will@kernel.org, kernel-team@android.com, Ard Biesheuvel <ardb@kernel.org> Subject: [PATCH v3 3/7] crypto: skcipher - disallow en/decrypt for non-task or non-softirq context Date: Wed, 12 May 2021 20:44:35 +0200 [thread overview] Message-ID: <20210512184439.8778-4-ardb@kernel.org> (raw) In-Reply-To: <20210512184439.8778-1-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 93fdacf49697..9bce5350008b 100644 --- a/crypto/skcipher.c +++ b/crypto/skcipher.c @@ -625,6 +625,11 @@ 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; @@ -642,6 +647,11 @@ 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; -- 2.20.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-05-12 21:08 UTC|newest] Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-05-12 18:44 [PATCH v3 0/7] running kernel mode SIMD with softirqs disabled Ard Biesheuvel 2021-05-12 18:44 ` Ard Biesheuvel 2021-05-12 18:44 ` [PATCH v3 1/7] crypto: handle zero sized AEAD inputs correctly Ard Biesheuvel 2021-05-12 18:44 ` Ard Biesheuvel 2021-05-12 20:04 ` Eric Biggers 2021-05-12 20:04 ` Eric Biggers 2021-05-12 21:24 ` Ard Biesheuvel 2021-05-12 21:24 ` Ard Biesheuvel 2021-05-21 7:55 ` Herbert Xu 2021-05-21 7:55 ` Herbert Xu 2021-05-21 9:28 ` Ard Biesheuvel 2021-05-21 9:28 ` Ard Biesheuvel 2021-05-12 18:44 ` [PATCH v3 2/7] crypto: aead - disallow en/decrypt for non-task or non-softirq context Ard Biesheuvel 2021-05-12 18:44 ` Ard Biesheuvel 2021-05-12 20:06 ` Eric Biggers 2021-05-12 20:06 ` Eric Biggers 2021-05-12 21:24 ` Ard Biesheuvel 2021-05-12 21:24 ` Ard Biesheuvel 2021-05-12 18:44 ` Ard Biesheuvel [this message] 2021-05-12 18:44 ` [PATCH v3 3/7] crypto: skcipher " Ard Biesheuvel 2021-05-12 18:44 ` [PATCH v3 4/7] crypto: arm64/gcm-aes-ce - remove non-SIMD fallback path Ard Biesheuvel 2021-05-12 18:44 ` Ard Biesheuvel 2021-05-12 18:44 ` [PATCH v3 5/7] crypto: arm64/aes-neonbs - stop using SIMD helper for skciphers Ard Biesheuvel 2021-05-12 18:44 ` Ard Biesheuvel 2021-05-12 20:08 ` Eric Biggers 2021-05-12 20:08 ` Eric Biggers 2021-05-12 21:25 ` Ard Biesheuvel 2021-05-12 21:25 ` Ard Biesheuvel 2021-05-12 18:44 ` [PATCH v3 6/7] crypto: arm64/aes-ce " Ard Biesheuvel 2021-05-12 18:44 ` Ard Biesheuvel 2021-05-12 18:44 ` [PATCH v3 7/7] crypto: arm64/aes-ccm - remove non-SIMD fallback path Ard Biesheuvel 2021-05-12 18:44 ` Ard Biesheuvel 2021-05-12 20:11 ` [PATCH v3 0/7] running kernel mode SIMD with softirqs disabled Eric Biggers 2021-05-12 20:11 ` Eric Biggers 2021-05-12 21:31 ` Ard Biesheuvel 2021-05-12 21:31 ` Ard Biesheuvel
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