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Date: Mon, 2 Mar 2020 11:08:02 -0800
From: Kees Cook <>
To: Kristen Carlson Accardi <>
Cc: Jann Horn <>, Thomas Gleixner <>,
	Ingo Molnar <>, Borislav Petkov <>,
	"H . Peter Anvin" <>,
	Arjan van de Ven <>,
	Rick Edgecombe <>,
	the arch/x86 maintainers <>,
	kernel list <>,
	Kernel Hardening <>
Subject: Re: [RFC PATCH 09/11] kallsyms: hide layout and expose seed

On Mon, Mar 02, 2020 at 11:01:56AM -0800, Kristen Carlson Accardi wrote:
> On Thu, 2020-02-06 at 20:27 +0100, Jann Horn wrote:
> >
> I looked through some of these packages as Jann suggested, and it seems
> like there are several that are using /proc/kallsyms to look for
> specific symbol names to determine whether some feature has been
> compiled into the kernel. This practice seems dubious to me, knowing
> that many kernel symbol names can be changed at any time, but
> regardless seems to be fairly common.

Cool, so a sorted censored list is fine for non-root. Would root users
break on a symbol-name-sorted view? (i.e. are two lists needed or can we
stick to one?)

Kees Cook

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