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Date: Mon, 3 Aug 2020 15:38:37 -0400
From: "Frank Ch. Eigler" <>
To: Joe Lawrence <>
Cc: Kees Cook <>,
	Evgenii Shatokhin <>,
	Kristen Carlson Accardi <>,
	Miroslav Benes <>,,,,,,,,,, Josh Poimboeuf <>,
	Jessica Yu <>
Subject: Re: [PATCH v4 00/10] Function Granular KASLR

Hi -

> > While this does seem to be the right solution for the extant problem, I
> > do want to take a moment and ask if the function sections need to be
> > exposed at all? What tools use this information, and do they just want
> > to see the bounds of the code region? (i.e. the start/end of all the
> > .text* sections) Perhaps .text.* could be excluded from the sysfs
> > section list?

> [[cc += FChE, see [0] for Evgenii's full mail ]]


> It looks like debugging tools like systemtap [1], gdb [2] and its
> add-symbol-file cmd, etc. peek at the /sys/module/<MOD>/section/ info.
> But yeah, it would be preferable if we didn't export a long sysfs
> representation if nobody actually needs it.

Systemtap needs to know base addresses of loaded text & data sections,
in order to perform relocation of probe point PCs and context data
addresses.  It uses /sys/module/...., kind of under protest, because
there seems to exist no MODULE_EXPORT'd API to get at that information
some other way.

- FChE

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