This is a note to let you know that I've just added the patch titled
[PATCH -stable] arm: crypto: reduce priority of bit-sliced AES cipher
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm-crypto-reduce-priority-of-bit-sliced-aes-cipher.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ebiggers@xxxxxxxxxx Sun Nov 19 11:20:08 2017
From: Eric Biggers <ebiggers@xxxxxxxxxx>
Date: Fri, 17 Nov 2017 11:50:27 -0800
Subject: [PATCH -stable] arm: crypto: reduce priority of bit-sliced AES cipher
To: stable@xxxxxxxxxxxxxxx
Cc: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>, linux-crypto@xxxxxxxxxxxxxxx, Eric Biggers <ebiggers@xxxxxxxxxx>
Message-ID: <20171117195027.88288-1-ebiggers@xxxxxxxxxx>
From: Eric Biggers <ebiggers@xxxxxxxxxx>
[ Not upstream because this is a minimal fix for a bug where arm32
kernels can use a much slower implementation of AES than is actually
available, potentially forcing vendors to disable encryption on their
devices.]
All the aes-bs (bit-sliced) and aes-ce (cryptographic extensions)
algorithms had a priority of 300. This is undesirable because it means
an aes-bs algorithm may be used when an aes-ce algorithm is available.
The aes-ce algorithms have much better performance (up to 10x faster).
Fix it by decreasing the priority of the aes-bs algorithms to 250.
This was fixed upstream by commit cc477bf64573 ("crypto: arm/aes -
replace bit-sliced OpenSSL NEON code"), but it was just a small part of
a complete rewrite. This patch just fixes the priority bug for older
kernels.
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
Acked-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
---
arch/arm/crypto/aesbs-glue.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/arch/arm/crypto/aesbs-glue.c
+++ b/arch/arm/crypto/aesbs-glue.c
@@ -357,7 +357,7 @@ static struct crypto_alg aesbs_algs[] =
}, {
.cra_name = "cbc(aes)",
.cra_driver_name = "cbc-aes-neonbs",
- .cra_priority = 300,
+ .cra_priority = 250,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct async_helper_ctx),
@@ -377,7 +377,7 @@ static struct crypto_alg aesbs_algs[] =
}, {
.cra_name = "ctr(aes)",
.cra_driver_name = "ctr-aes-neonbs",
- .cra_priority = 300,
+ .cra_priority = 250,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
.cra_blocksize = 1,
.cra_ctxsize = sizeof(struct async_helper_ctx),
@@ -397,7 +397,7 @@ static struct crypto_alg aesbs_algs[] =
}, {
.cra_name = "xts(aes)",
.cra_driver_name = "xts-aes-neonbs",
- .cra_priority = 300,
+ .cra_priority = 250,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct async_helper_ctx),
Patches currently in stable-queue which might be from ebiggers@xxxxxxxxxx are
queue-4.4/arm-crypto-reduce-priority-of-bit-sliced-aes-cipher.patch