linux-kernel - Re: [RFC, PATCH] Fixup COMPAT_VDSO to work with CONFIG

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Date:	Fri, 16 Mar 2007 09:46:51 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Jan Beulich <jbeulich@...ell.com>
CC:	Zachary Amsden <zach@...are.com>, Ingo Molnar <mingo@...e.hu>,
	Virtualization Mailing List <virtualization@...ts.osdl.org>,
	Andrew Morton <akpm@...l.org>,
	Linus Torvalds <torvalds@...l.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Chris Wright <chrisw@...s-sol.org>, Andi Kleen <ak@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [RFC, PATCH] Fixup COMPAT_VDSO to work with	CONFIG_PARAVIRT

Jan Beulich wrote:
> I have one, too (which is one reasone why I created the original Xen patch).
>   

It's some version of SuSE 9, right?  What glibc version?

>>> I'm playing safe.  Binary identical relocation to 0xffffe000 was my goal.
>>>       
>> Yeah, fair enough.  But as Eric likes to keep pointing out, an
>> executable ELF file need not have any sections at all, so the only safe
>> course for anything "real" is via the section headers.
>>     
>
> Program headers you mean.
>   

Er, yep.

>> So I guess the right thing to do is relocate the dynamic stuff via
>> PT_DYNAMIC, and relocate the symtab if its present.
>>     
>
> Symtab should also be deduced from program headers.
>   

Well, the normal symtab might be completely missing.  But yes, the
dynamic symtab should be in the PT_DYNAMIC.

    J
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