crypto: sun8i-ce - permit asynchronous skcipher as fallback

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Even though the sun8i-ce driver implements asynchronous versions of
ecb(aes) and cbc(aes), the fallbacks it allocates are required to be
synchronous. Given that SIMD based software implementations are usually
asynchronous as well, even though they rarely complete asynchronously
(this typically only happens in cases where the request was made from
softirq context, while SIMD was already in use in the task context that
it interrupted), these implementations are disregarded, and either the
generic C version or another table based version implemented in assembler
is selected instead.

Since falling back to synchronous AES is not only a performance issue, but
potentially a security issue as well (due to the fact that table based AES
is not time invariant), let's fix this, by allocating an ordinary skcipher
as the fallback, and invoke it with the completion routine that was given
to the outer request.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Tested-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

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Ard Biesheuvel 2020-07-07 09:31:55 +03:00 • committed by Herbert Xu

parent 89fb00f245

commit 31abd3eb3d

2 changed files with 25 additions and 24 deletions

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41

drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c

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8

drivers/crypto/allwinner/sun8i-ce/sun8i-ce.h

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