linux-kernel - [PATCH 0/2] Revert to 32-bit 3.15-style vvar and vdso stripping

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Date:	Thu, 10 Jul 2014 18:13:14 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Jan Beulich <JBeulich@...e.com>, hpa@...or.com,
	linux-kernel@...r.kernel.org
Cc:	Boris Ostrovsky <ostr.lkml@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>, x86@...nel.org,
	Andy Lutomirski <luto@...capital.net>
Subject: [PATCH 0/2] Revert to 32-bit 3.15-style vvar and vdso stripping

The fancy ideas of aggressively stripping the vdso and placing the
vvar data after the vdso have been considerably more painful than I
hoped.  This reverts to using objcopy -S to strip the vdso (thus
eliminating the whole fake section mechanism and all of its
attendent build-time fragility, I hope) and places the vvar data
before the vdso.

The latter is a bit messy: ELF wasn't really designed to have
symbols at negative virtual addresses.  I think I got all the
bitness issues and cross-compilation stuff right, but I'm not
well-equipped to test that.  The kbuild robot hasn't complained yet,
though.

I don't know whether this is 3.16 material.  I'm not aware of an
actual problem at this point, but the current state of affairs is
quite fragile.

Applies on top of tip/x86/urgent as of a few minutes ago.

Andy Lutomirski (2):
  x86,vdso: Move the vvar area before the vdso text
  x86,vdso: Get rid of the fake section mechanism

 arch/x86/include/asm/vdso.h       |  18 +--
 arch/x86/vdso/Makefile            |  16 ++-
 arch/x86/vdso/vdso-fakesections.c |  21 ----
 arch/x86/vdso/vdso-layout.lds.S   |  44 ++++----
 arch/x86/vdso/vdso2c.c            | 128 ++++++++++++++++-----
 arch/x86/vdso/vdso2c.h            | 227 +++++++-------------------------------
 arch/x86/vdso/vma.c               |  20 ++--
 7 files changed, 188 insertions(+), 286 deletions(-)
 delete mode 100644 arch/x86/vdso/vdso-fakesections.c

-- 
1.9.3

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