linux-kernel - Re: RFC: bug in load_elf

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Message-ID: <46E9B30E.1080402@goop.org>
Date:	Thu, 13 Sep 2007 15:00:46 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Chris Friesen <cfriesen@...tel.com>
CC:	linux-kernel@...r.kernel.org, Andi Kleen <ak@...e.de>,
	Andrew Morton <akpm@...l.org>,
	James Bottomley <James.Bottomley@...eleye.com>,
	bapper@...atehaven.org, aaw@...gle.com
Subject: Re: RFC: bug in load_elf_binary?

Chris Friesen wrote:
> The elf spec says that PT_LOAD segments must be ordered by vaddr.  We
> want to have a segment at a relatively low fixed vaddr.  The exact
> address is not important, except that it's lower than the standard elf
> headers and so it must be the first segment in the elf file.

So you want a zero mapping at a particular address?  So the vaddr and
the memsz are set, but offset and filesz are zero?

> In the kernel elf loader, the p_vaddr and p_offset of the first
> segment are used to determine the load_addr for use with the rest of
> the segments.  In the case of this elf file, the first segment does
> not actually have a valid p_offset.

Well, you could make the p_offset the same as the first segment with a
non-zero filesz.  That should satisfy the elf loader, though it might
still confuse things.

Why can't you create this mapping at runtime?

    J
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