linux-kernel - [patch 0/2] Updates to compat VDSOs

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Message-Id: <20070405155323.759992347@goop.org>
Date:	Thu, 05 Apr 2007 08:53:23 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Andi Kleen <ak@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	virtualization@...ts.osdl.org, lkml <linux-kernel@...r.kernel.org>,
	Zachary Amsden <zach@...are.com>,
	"Jan Beulich" <JBeulich@...ell.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Ingo Molnar <mingo@...e.hu>, Roland McGrath <roland@...hat.com>
Subject: [patch 0/2] Updates to compat VDSOs

Hi Andi,

Here's a couple of patches to fix up COMPAT_VDSO:

The first is a straightforward implementation of Jan's original idea
of relocating the VDSO to match its mapped location.  Unlike Jan and
Zach's version, I changed it to relocate based on the phdrs rather than
the sections; the result is pleasantly compact.

The second patch takes advantage of the fact that all the COMPAT_VDSO work
happens at runtime now, and allows compat mode to be enabled dynamically.
If you specify vdso=2 on the kernel command line, it comes up in compat
mode; vdso=1 is normal vdso mode, and vdso=0 disables vdso altogether.
You can also switch modes with sysctl.

Changes since last posting:
 - rebase sections as well as phdrs
 - relocate symbols
 - more robust DT_tag handling
 - handle dynamic compat mode switches a bit better

Thanks to Jan and Roland for the review.

Thanks,
	J

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