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authorEric Biggers <ebiggers@google.com>2019-01-31 23:51:42 -0800
committerHerbert Xu <herbert@gondor.apana.org.au>2019-02-08 15:30:08 +0800
commit12455e320e19e9cc7ad97f4ab89c280fe297387c (patch)
treecdacd4ffb49119d01c1b14e69210c811c9aab9ae /arch/arm64
parent77568e535af7c4f97eaef1e555bf0af83772456c (diff)
crypto: arm64/aes-neonbs - fix returning final keystream block
The arm64 NEON bit-sliced implementation of AES-CTR fails the improved skcipher tests because it sometimes produces the wrong ciphertext. The bug is that the final keystream block isn't returned from the assembly code when the number of non-final blocks is zero. This can happen if the input data ends a few bytes after a page boundary. In this case the last bytes get "encrypted" by XOR'ing them with uninitialized memory. Fix the assembly code to return the final keystream block when needed. Fixes: 88a3f582bea9 ("crypto: arm64/aes - don't use IV buffer to return final keystream block") Cc: <stable@vger.kernel.org> # v4.11+ Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'arch/arm64')
-rw-r--r--arch/arm64/crypto/aes-neonbs-core.S8
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/arm64/crypto/aes-neonbs-core.S b/arch/arm64/crypto/aes-neonbs-core.S
index e613a87f8b53..8432c8d0dea6 100644
--- a/arch/arm64/crypto/aes-neonbs-core.S
+++ b/arch/arm64/crypto/aes-neonbs-core.S
@@ -971,18 +971,22 @@ CPU_LE( rev x8, x8 )
8: next_ctr v0
st1 {v0.16b}, [x24]
- cbz x23, 0f
+ cbz x23, .Lctr_done
cond_yield_neon 98b
b 99b
-0: frame_pop
+.Lctr_done:
+ frame_pop
ret
/*
* If we are handling the tail of the input (x6 != NULL), return the
* final keystream block back to the caller.
*/
+0: cbz x25, 8b
+ st1 {v0.16b}, [x25]
+ b 8b
1: cbz x25, 8b
st1 {v1.16b}, [x25]
b 8b