linux-kernel - Re: [PATCH v3 17/21] vmcore: check NT_VMCORE_PAD as a mark indicating the end of ELF note buffer

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Message-ID: <87ppyvp014.fsf@xmission.com>
Date:	Tue, 19 Mar 2013 14:11:51 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	HATAYAMA Daisuke <d.hatayama@...fujitsu.com>
Cc:	vgoyal@...hat.com, cpw@....com, kumagai-atsushi@....nes.nec.co.jp,
	lisa.mitchell@...com, heiko.carstens@...ibm.com,
	akpm@...ux-foundation.org, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org, zhangyanfei@...fujitsu.com
Subject: Re: [PATCH v3 17/21] vmcore: check NT_VMCORE_PAD as a mark indicating the end of ELF note buffer

HATAYAMA Daisuke <d.hatayama@...fujitsu.com> writes:

> Modern kernel marks the end of ELF note buffer with NT_VMCORE_PAD type
> note in order to make the buffer satisfy mmap()'s page-size boundary
> requirement. This patch makes finishing reading each buffer if the
> note type now being read is NT_VMCORE_PAD type.

Ick.  Even with a pad header you can mark the end with an empty header,
and my memory may be deceiving me but I believe an empty header is
specified by the ELF ABI docs.

Beyond which I don't quite see the point of any of this as all of these
headers need to be combined into a single note section before being
presented to user space.

Eric
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