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Date: Thu, 6 Feb 2020 20:27:45 +0100
From: Jann Horn <>
To: Kristen Carlson Accardi <>
Cc: Kees Cook <>, 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 Thu, Feb 6, 2020 at 6:51 PM Kristen Carlson Accardi
<> wrote:
> On Thu, 2020-02-06 at 04:32 -0800, Kees Cook wrote:
> > In the past, making kallsyms entirely unreadable seemed to break
> > weird
> > stuff in userspace. How about having an alternative view that just
> > contains a alphanumeric sort of the symbol names (and they will
> > continue
> > to have zeroed addresses for unprivileged users)?
> >
> > Or perhaps we wait to hear about this causing a problem, and deal
> > with
> > it then? :)
> >
> Yeah - I don't know what people want here. Clearly, we can't leave
> kallsyms the way it is. Removing it entirely is a pretty fast way to
> figure out how people use it though :).

FYI, a pretty decent way to see how people are using an API is, which searches through the source code of all
the packages debian ships:

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