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cryptomount fails on boot with dm-crypt volume
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th0th696
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Joined: 08 Dec 2004
Posts: 184

PostPosted: Fri Oct 19, 2012 10:07 pm    Post subject: cryptomount fails on boot with dm-crypt volume Reply with quote

I've followed this wiki page:

http://en.gentoo-wiki.com/wiki/Root_filesystem_over_LVM2,_DM-Crypt_and_RAID

However I am not using RAID, the section on grub2 appears to be incomplete, as the wiki page for grub2 here:

http://wiki.gentoo.org/wiki/GRUB2#Booting_from_LUKS_Physical_Volume

implies that you must have:

Code:
    insmod gzio
   insmod part_gpt
   insmod cryptodisk
   insmod luks
   insmod gcry_twofish
   insmod gcry_sha256
        cryptomount -u <uuid>
   insmod lvm
   insmod ext2
   set root='lvm/<VG>-<LV>'


in your menuentry for luks to work, so i've added a file 01_mygrub2 into /etc/grub.d in which I've put:
http://bpaste.net/show/52375/

However, when booting it tells me that cryptomount device is missing, I have double-checked the UUID it is correct, any idea what I can do to please cryptomount?

EDIT: of note I tried setting cryptomount to
Code:

cryptomount (hd0,msdos3)


as well using the autocomplete from grub2's edit mode, but pretty much same error:

Code:
Error: disk (hd0,msdos3) not found


but as I said I used the autocomplete so it should be there. blkid certainly shows it there:

Code:
/dev/sda3: UUID="6a3603e9-xxxxxx" TYPE="crypto_LUKS"


here is how I enter the crypt using another bootable partition (linux mint):
http://bpaste.net/show/52374/

and the environment is certainly fine there, I can emerge fine and all of that.

Here is the script I used to create the crypt and lvm before hand:
http://bpaste.net/show/52373/

here's the script I used to create the initramfs:
http://bpaste.net/show/52372/

my 'init' can be found here:
http://bpaste.net/show/52371/

emerge --info:
http://bpaste.net/show/52464/

kernel config:
http://bpaste.net/show/52465/
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ribx
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Joined: 20 Nov 2003
Posts: 209
Location: germany

PostPosted: Mon Oct 22, 2012 1:02 pm    Post subject: Reply with quote

just a guess:

/dev/sda3 = (hd0,msdos2)

[EDIT] no, that was wrong sorry! I forgot that I have a /boot partition, but I know remember why ;) I also tried luks once, but at the end the conclusion was, that its not worth the work for everything outside /home (for me of course).[/EDIT]
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th0th696
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Posts: 184

PostPosted: Fri Oct 26, 2012 2:26 am    Post subject: Reply with quote

Just in case I tried:

cryptomount (hd0,msdos2)

and

cryptomount (hd0,msdos1)

same odd error about the partition not being found.

Here are the flags I currently have built in grub:

custom-cflags debug device-mapper doc efiemu nls sdl static truetype

and the full eix:

[I] sys-boot/grub
Available versions:
(0) *0.92-r1 0.94-r1 0.96-r1 0.96-r2 (~)0.96-r3 (~)0.97 0.97-r2 0.97-r3 0.97-r4 0.97-r5 0.97-r6 (~)0.97-r8 0.97-r9 0.97-r10 (~)0.97-r11 0.97-r12 (~)0.97-r13
(2) **1.99-r2 **2.00_beta6 (~)2.00-r1 **9999
{{custom-cflags debug device-mapper doc efiemu libzfs mount ncurses netboot nls sdl static truetype GRUB_PLATFORMS="coreboot efi-32 efi-64 emu ieee1275 multiboot pc qemu qemu-mips yeeloong"}}
Installed versions: 2.00-r1(2)(09:31:55 10/24/12)(custom-cflags debug device-mapper doc efiemu nls sdl static truetype -libzfs -mount GRUB_PLATFORMS="-coreboot -efi-32 -efi-64 -emu -ieee1275 -multiboot -pc -qemu -qemu-mips -yeeloong")
Homepage: http://www.gnu.org/software/grub/
Description: GNU GRUB boot loader


I am still stumped here, I have tried everything I can think of, it seems cryptomount is the problem, but I am not certain of that. Anyone have any suggestions?
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TakChun
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Joined: 28 Oct 2012
Posts: 1

PostPosted: Sun Oct 28, 2012 9:47 am    Post subject: Reply with quote

I have similar problems.

What might help you is to use no brackets:

grub> cryptomount (hd0,msdos6)
Error: disk (hd0,msdos6) not found

grub> cryptomount hd0,msdos6
Attempting to decrypt master key ...

(Works also from within grub.cfg)
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th0th696
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PostPosted: Sun Oct 28, 2012 2:03 pm    Post subject: Reply with quote

woohoo, getting rid of the parantheses did work at least for cryptomount:

Code:
cryptomount hd0,msdos3
Attempting to decrypt master key ...


however, it does bork right after that with:

Code:
error invalid file name: root=/dev/mapper/vg-root


which is I'm assuming the linux kernel line firing off:

Code:
root=/dev/mapper/vg-root


perhaps it's the earlier line in grub.cfg that is obfuscating this issue by not loading the lvm properly:

Code:
set root='lvm/vg-root'


I'm going to try altering those with some obvious values, btw so far I've tried

Code:
set root='lvm/vg'
set root='lvm/vault'


any suggestions are very welcome. And thanks again TakChun!!! good catch, I'll have to fill out a bug report on grub2 as I think the auto-fill was at fault here.

bug:
https://savannah.gnu.org/bugs/index.php?37644

btw: vg is the name of the VG as it appears in vgdisplay:
http://bpaste.net/show/54095/
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