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Re: [PATCH 5/5] Cryptomount support for hyphens in UUID

From: John Lane
Subject: Re: [PATCH 5/5] Cryptomount support for hyphens in UUID
Date: Wed, 29 Jul 2015 19:53:25 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.1.2

On 29/07/15 17:51, Andrei Borzenkov wrote:
> That not what I mean. This patch ignores hyphens in UUID for any
> current and future crypto backends. This means that it cannot
> distinguish between 11-122 and 111-22 as UUID. And we cannot be sure we
> never meet such backend. 
do you really think that's likely?
> And GELI as far as I can tell does not
> actually use hyphens.
> We already made mistake of mangling native UUID, I'd rather avoid
> continue to do it.
> Can we restrict this to LUKS only? 
One of the three places that UUIDs are compared is in the LUKS module.
The other two are in the generic cryptodisk module, one when the "-u"
argument is given (which I believe is LUKS-specific although not in the
LUKS module) and the other when a crypto disk is referenced as a
(cryptouuid/...) which is generic code, not LUKS-specific. Making it
LUKS-specific would mean deleting the third case, which is actually the
most useful IMHO.

Unless we could identify a LUKS disk from within a grub_cryptodisk_t but
I don't think that's possible ?
If it were, we could make the "uuidcmp" function accept an
"ignore-hyphens" parameter that is true for LUKS and false for
everything else.

But it all seems to be getting overcomplicated for what was meant to be
a simple tweak.

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