linux-kernel - Re: [PATCH -repost 05/21] kgr: update Kconfig documentation

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Date:	Wed, 25 Jun 2014 13:42:12 +0100
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	linux-kernel@...r.kernel.org, tj@...nel.org, rostedt@...dmis.org,
	mingo@...hat.com, akpm@...ux-foundation.org, andi@...stfloor.org,
	paulmck@...ux.vnet.ibm.com, pavel@....cz, jirislaby@...il.com,
	Vojtech Pavlik <vojtech@...e.cz>, Michael Matz <matz@...e.de>,
	Jiri Kosina <jkosina@...e.cz>, Udo Seidel <udoseidel@....de>
Subject: Re: [PATCH -repost 05/21] kgr: update Kconfig documentation

On Wed, 25 Jun 2014 13:06:59 +0200
Jiri Slaby <jslaby@...e.cz> wrote:

> This is based on Udo's text which was augmented in this patch.
> 
> Signed-off-by: Jiri Slaby <jslaby@...e.cz>
> Cc: Udo Seidel <udoseidel@....de>
> Cc: Vojtech Pavlik <vojtech@...e.cz>
> ---
>  kernel/Kconfig.kgraft | 3 +++
>  samples/Kconfig       | 4 ++++
>  2 files changed, 7 insertions(+)
> 
> diff --git a/kernel/Kconfig.kgraft b/kernel/Kconfig.kgraft
> index f38d82c06580..bead93646071 100644
> --- a/kernel/Kconfig.kgraft
> +++ b/kernel/Kconfig.kgraft
> @@ -5,3 +5,6 @@ config KGRAFT
>  	bool "kGraft infrastructure"
>  	depends on DYNAMIC_FTRACE_WITH_REGS
>  	depends on HAVE_KGRAFT
> +	help
> +	  Select this to enable kGraft online kernel patching. The
> +	  runtime price is zero, so it is safe to say Y here.
> diff --git a/samples/Kconfig b/samples/Kconfi

The runtime impact is that you've just introduced a virus and trojan
writers delight into your kernel. There's a balance between convenience
and security but given most users will never use kgraft this advice seems
incorrect.

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