Re: [Bug] Rockchip crypto driver sometimes produces wrong ciphertext

["Ezequiel Garcia" <ezequiel.garcia@collabora.com>]

Adding my colleague Gael, who has been working on fixing this driver.
 
On Friday, March 15, 2019 00:31 -03, Eric Biggers <ebiggers@kernel.org> wrote: 
 
> Hi Zhang,
> 
> On Mon, Jan 28, 2019 at 11:14:32AM +0800, Tao Huang wrote:
> > Hi Eric and Heiko:
> > 
> > >> On Sat, 26 Jan 2019 at 22:05, Eric Biggers <ebiggers@kernel.org> wrote:
> > >>>
> > >>> 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/
> > 
> > Zhang Zhijie, engineer from Rockchip, will try to fix this software bug.
> > 
> > >>>
> > >>> 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
> > >>
> 
> Thanks for the fixes, but I've improved the self-tests more, and there is
> another bug.  See the KernelCI job here:
> 
> 	https://kernelci.org/boot/all/job/ardb/branch/for-kernelci/kernel/v5.0-11071-g7d597cc3f0ef/
> 
> The self-tests are failing on the rk3288-rock2-square platform:
> 
> 	alg: skcipher: cbc-aes-rk encryption test failed (wrong output IV) on test vector 0, cfg=\"in-place\"
> 	alg: skcipher: cbc-des-rk encryption test failed (wrong output IV) on test vector 0, cfg=\"in-place\"
> 	alg: skcipher: cbc-des3-ede-rk encryption test failed (wrong output IV) on test vector 0, cfg=\"in-place\"
> 
> The issue is that the self-tests now verify that CBC implementations update the
> IV buffer to contain the next IV, aka the last ciphertext block.  But the
> Rockchip crypto driver doesn't do that, so it needs to be fixed.
> 
> This has always been a requirement for CBC implementations so that users can
> chain CBC requests.  Unfortunately it was just never tested for...
> 
> This should be easily reproducible using the mainline kernel.
> 
> - Eric


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