On Fri, Aug 19, 2016 at 03:31:47PM -0700, Kees Cook wrote:

On Fri, Aug 19, 2016 at 2:41 PM,  [off-list ref] wrote:

quoted

From: "Luis R. Rodriguez" <mcgrof@kernel.org>

Add a userspace sandbox to allow easy experimentation and
test extensions with linker tables, section ranges and the
new section core definitions.

The userspace sandbox tries to mimic the Linux kernel development
flow as much as possible, it however relies on and uses libc. Support
is currently only provided to x86_64.

v4: this patch is new in this series -- added to the kenrel as
    suggested by Boris, as otherwise it'd be really hard to keep
    an external userspace repository in sync.

Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
---
 Documentation/sections/linker-tables.rst           |   4 +-
 MAINTAINERS                                        |   1 +
 include/linux/tables.h                             |   5 +-
 tools/Makefile                                     |   3 +-
 .../arch/x86/include/generated/asm/section-core.h  |   1 +
 tools/arch/x86/include/generated/ranges.h          |   1 +
 tools/arch/x86/include/generated/tables.h          |   1 +
 tools/include/asm-generic/ranges.h                 | 103 ++++
 tools/include/asm-generic/section-core.h           | 341 +++++++++++
 tools/include/asm-generic/tables.h                 |  50 ++

Aren't a bunch of these files exact duplicates of the headers in include/linux?

Indeed... This a userspace tools/ architecture decision that was made long ago,
so its not up to me, I am just following the strategy devised and picked up.
Refer to 7d7d1bf1d1dabe435ef50efb051724b8664749cb ("perf bench: Copy kernel
files needed to build mem{cpy,set} x86_64 benchmarks") for an example of
previous similar work. By sharing header files this enable more tools/
to be hacked on.

  Luis

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