Re: dm-crypt patch in Linux 4.20.6 Commit e4efd3184d9a63a7923e5c62fa236254f03c6bf8

[Greg KH <gregkh@linuxfoundation.org>]

On Fri, Feb 08, 2019 at 11:39:00AM +0000, 23pieces wrote:
> Hello everyone!
> 
> It seems since kernelversion 4.20.6 many people have problems mounting their encrypted rootfs while booting.
> 
> Trying to investigate i found this commit in 4.20.6:
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/md/dm-crypt.c?id=e4efd3184d9a63a7923e5c62fa236254f03c6bf8
> 
> To clarify this issue also persists in 4.20.7 and isn't occuring in 4.20.5.
> 
> People having the problem often have something like the following config on their rootfs (including myself):
> cryptsetup -v --type luks --cipher aes-xts-plain64 --key-size 512 --hash sha512 --iter-time 5000 --use-random --verify-passphrase luksFormat device
> 
> I was trying to investigate the code in the commit and playing around with the dmsetup commands mentioned.
> 
> Now on a running system with kernel 4.20.6 i get:
> 
> dmsetup create test --table "0 8 crypt aes-cbc-essiv:sha3-256 9c1185a5c5e9fc54612808977ee8f5b9e 0 /dev/sdc 0"      Works
> 
> dmsetup create test --table "0 8 crypt aes-cbc-essiv:sha512 9c1185a5c5e9fc54612808977ee8f5b9e 0 /dev/sdc 0"
> device-mapper: reload ioctl on test  failed: Invalid argument
> Command failed.
> 
> dmsetup create test --table "0 8 crypt aes-xts-plain-64:sha3-256 9c1185a5c5e9fc54612808977ee8f5b9e 0 /dev/sdc 0"
> device-mapper: reload ioctl on test  failed: Invalid argument
> Command failed.
> 
> dmsetup create test --table "0 8 crypt aes-xts-plain-64:sha512 9c1185a5c5e9fc54612808977ee8f5b9e 0 /dev/sdc 0"
> device-mapper: reload ioctl on test  failed: Invalid argument
> Command failed.
> 
> 
> At boot people have the following error:
> device-mapper: reload ioctl on  failed: Invalid argument
> Failed to setup dm-crypt key mapping for device /dev/disk/by-uuid/UUID
> Check that kernel supports aes-xts-plain-64 cipher (check syslog for more info)
> 
> I don't have a patch for this yet, just wanted to inform you.

Are people also having problems with 5.0-rc5?

thanks,

greg k-h