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authorEric Biggers <ebiggers@google.com>2018-09-11 20:05:10 -0700
committerHerbert Xu <herbert@gondor.apana.org.au>2018-09-21 13:24:50 +0800
commita5e9f557098e54af44ade5d501379be18435bfbf (patch)
tree4410647aaa269fd9a4e304851b06f83251b12853 /drivers/bus
parent78105c7e769b8cfa4a4d59027807882b560a2634 (diff)
crypto: chacha20 - Fix chacha20_block() keystream alignment (again)
In commit 9f480faec58c ("crypto: chacha20 - Fix keystream alignment for chacha20_block()"), I had missed that chacha20_block() can be called directly on the buffer passed to get_random_bytes(), which can have any alignment. So, while my commit didn't break anything, it didn't fully solve the alignment problems. Revert my solution and just update chacha20_block() to use put_unaligned_le32(), so the output buffer need not be aligned. This is simpler, and on many CPUs it's the same speed. But, I kept the 'tmp' buffers in extract_crng_user() and _get_random_bytes() 4-byte aligned, since that alignment is actually needed for _crng_backtrack_protect() too. Reported-by: Stephan Müller <smueller@chronox.de> Cc: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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