linux-kernel - Re: [Xen-devel] [PATCH 2/10] linux 2.6.18: COMPAT

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Date:	Tue, 06 Mar 2007 07:52:47 +0000
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	"Jeremy Fitzhardinge" <jeremy@...p.org>
Cc:	"Virtualization Mailing List" <virtualization@...ts.osdl.org>,
	<xen-devel@...ts.xensource.com>,
	"Rusty Russell" <rusty@...tcorp.com.au>, "Andi Kleen" <ak@...e.de>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH 2/10] linux 2.6.18: COMPAT_VDSO

>Ingo just raised this as an issue for paravirt_ops as well.  I don't
>quite follow what's going on there.   My understanding is that there are
>some old versions of glibc (which were unreleased CVS snapshots shipped
>by some vendors) which don't use the vdso's ELF header, but instead have
>their own canned one which built into the library itself.

Perhaps you meanwhile saw the similar question from Keir regarding this
(and my answer), but in short: plain glibc 2.3.2 (at least) supports AT_SYSINFO
but not AT_SYSINFO_HDR. In this scenario, moving the vDSO around is fine,
but glibc-internal (arguably broken) consistency checks prevent the vDSO from
being accepted when not using COMPAT_VDSO.

Jan
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