linux-kernel - Re: [patch 1/2] Relocate VDSO ELF headers to match mapped location with COMPAT

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Date:	Thu, 05 Apr 2007 00:31:38 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Jan Beulich <jbeulich@...ell.com>
CC:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	virtualization@...ts.osdl.org, Roland McGrath <roland@...hat.com>,
	Andi Kleen <ak@...e.de>, lkml <linux-kernel@...r.kernel.org>,
	Zachary Amsden <zach@...are.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [patch 1/2] Relocate VDSO ELF headers to match mapped	location
 with COMPAT_VDSO

Jan Beulich wrote:
> While there's a certain level of control on what DT_* may appear in the
> vDSO, not even considering other than the above types seems fragile to
> me. Since future additions to the set are supposedly following a fixed
> scheme (distinguishing pointers and values via the low bit when below
> OLD_DT_LOOS, and using sub-ranges when between DT_HIOS and
> OLD_DT_HIOS), at least also handling those would seem like a good
> idea, as would warning about unrecognized types.
>   

I wasn't aware of this scheme.  Where is it documented?

> Also, even though it shouldn't matter for the final result, if doing things
> spec-conforming here you should use d_un.d_ptr.
>   

Yes, I've already fixed that.

> In addition to Roland's remarks about missing symbol table relocation, I
> would also assume section headers, if present, should be relocated.
>   

Yes, I suppose that's easy enough to add.

    J
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