[Bug] Rockchip crypto driver sometimes produces wrong ciphertext

[Eric Biggers <ebiggers@kernel.org>]

Hello,

I don't know whether anyone is actually maintaining the Rockchip crypto driver
in drivers/crypto/rockchip/, but it's failing the improved crypto tests
that I currently have out for review: https://patchwork.kernel.org/cover/10778089/

See the boot logs for RK3288 from the KernelCI job here:

https://storage.kernelci.org/ardb/for-kernelci/v5.0-rc1-86-geaffe22db9d1/arm/multi_v7_defconfig/lab-collabora/boot-rk3288-rock2-square.txt
https://storage.kernelci.org/ardb/for-kernelci/v5.0-rc1-86-geaffe22db9d1/arm/multi_v7_defconfig/lab-collabora/boot-rk3288-veyron-jaq.txt

alg: skcipher: ecb-aes-rk encryption test failed (wrong result) on test vector 0, cfg=\"random: use_digest src_divs=[15.64%@+3258, 84.36%@+4059] dst_divs=[69.11%@+1796, 8.49%@+4027, 6.34%@+1, 16.6%@+4058] iv_offset=21\"
alg: skcipher: cbc-aes-rk encryption test failed (wrong result) on test vector 0, cfg=\"random: may_sleep use_digest src_divs=[100.0%@alignmask+3993] dst_divs=[65.31%@alignmask+1435, 34.69%@+14]\"
alg: skcipher: ecb-des-rk encryption test failed (wrong result) on test vector 0, cfg=\"random: may_sleep use_final src_divs=[<flush> 66.52%@+11, 33.48%@+1519] dst_divs=[58.82%@+1, 19.43%@+4082, 21.75%@+8]\"
alg: skcipher: cbc-des-rk encryption test failed (wrong result) on test vector 0, cfg=\"random: may_sleep use_finup src_divs=[100.0%@+3980] dst_divs=[60.4%@+3763, 23.9%@+4011, 16.87%@+4046]\"
alg: skcipher: ecb-des3-ede-rk encryption test failed (wrong result) on test vector 0, cfg=\"random: may_sleep use_digest src_divs=[100.0%@+4] dst_divs=[47.25%@+19, 14.83%@+22, 37.92%@+31]\"
alg: skcipher: cbc-des3-ede-rk encryption test failed (wrong result) on test vector 0, cfg=\"two even aligned splits\"

In other words: the ecb-aes-rk, cbc-aes-rk, ecb-des-rk, cbc-des-rk,
ecb-des3-ede-rk, and cbc-des3-ede-rk algorithms are failing because they produce
the wrong ciphertext on some scatterlist layouts.

You can reproduce by pulling from
https://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux.git
branch "testmgr-improvements", unsetting CONFIG_CRYPTO_MANAGER_DISABLE_TESTS,
setting CONFIG_CRYPTO_MANAGER_EXTRA_TESTS=y, rebooting and checking dmesg.

Note that I don't have this hardware myself, so if it turns out that no one is
interested in fixing this anytime soon I'll instead have to propose disabling
these algorithms until they can be fixed.

Thanks,

- Eric