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Date: Mon, 02 Oct 2017 22:12:04 +0100
From: David Howells <>
To: Geert Uytterhoeven <>
Cc:, "Jason A. Donenfeld" <>,,,,
    "" <>,, Herbert Xu <>,
    Kirill Marinushkin <>,
    Ard Biesheuvel <>,
    Ilhan Gurel <>,,
    stable <>
Subject: Re: Modular BIG_KEYS (was: Re: [PATCH v4] security/keys: rewrite all of big_key crypto)

Geert Uytterhoeven <> wrote:

> Now this has hit mainline, the "BIG_KEYS" Kconfig symbol appeared on my
> radar. Is there any reason this cannot be tristate?

It was tristate, but it got converted to bool:

	commit 2eaf6b5dcafda2b8c22930eff7f48a364fce1741
	KEYS: Make BIG_KEYS boolean

and then:

	commit a1f2bdf338f15dbad10ee6362891ebf79244858b
	security/keys: make big_key.c explicitly non-modular

> So to save kernel size, I wan't to save N, but for a distro kernel that might
> have Kerberos users, you currently need to say Y, while M would be nicer.

If you want to do that, you'll need to implement demand-loading of key type

Note that you'd end up using a minimum of a whole page as a module rather than
~2K if built in (I know, that's a compromise you have to decide on).


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