]> www.infradead.org Git - users/jedix/linux-maple.git/commit
crypto: arm64/crct10dif - revert to C code for short inputs
authorArd Biesheuvel <ard.biesheuvel@linaro.org>
Sun, 27 Jan 2019 09:16:53 +0000 (10:16 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sat, 23 Mar 2019 13:35:18 +0000 (14:35 +0100)
commit5b9728268e817ebb7b1e4c4e1bb36abcd1537938
tree85a41f6f24e7e4991b266aa384f5104bbd0ef9a2
parente605d572c3ca00698ed0d05dc343c3a195196fdb
crypto: arm64/crct10dif - revert to C code for short inputs

commit d72b9d4acd548251f55b16843fc7a05dc5c80de8 upstream.

The SIMD routine ported from x86 used to have a special code path
for inputs < 16 bytes, which got lost somewhere along the way.
Instead, the current glue code aligns the input pointer to 16 bytes,
which is not really necessary on this architecture (although it
could be beneficial to performance to expose aligned data to the
the NEON routine), but this could result in inputs of less than
16 bytes to be passed in. This not only fails the new extended
tests that Eric has implemented, it also results in the code
reading past the end of the input, which could potentially result
in crashes when dealing with less than 16 bytes of input at the
end of a page which is followed by an unmapped page.

So update the glue code to only invoke the NEON routine if the
input is at least 16 bytes.

Reported-by: Eric Biggers <ebiggers@kernel.org>
Reviewed-by: Eric Biggers <ebiggers@kernel.org>
Fixes: 6ef5737f3931 ("crypto: arm64/crct10dif - port x86 SSE implementation to arm64")
Cc: <stable@vger.kernel.org> # v4.10+
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
arch/arm64/crypto/crct10dif-ce-glue.c