linux-kernel - Re: [PATCH v3 18/21] vmcore: check if vmcore objects satify mmap()'s page-size boundary requirement

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Message-ID: <20130321145743.GI3934@redhat.com>
Date:	Thu, 21 Mar 2013 10:57:43 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	HATAYAMA Daisuke <d.hatayama@...fujitsu.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 18/21] vmcore: check if vmcore objects satify mmap()'s
 page-size boundary requirement

On Wed, Mar 20, 2013 at 11:29:05PM -0700, Eric W. Biederman wrote:

[..]
> Preserving the actual PT_LOAD segments p_paddr and p_memsz values is
> important. p_offset we can change as much as we want.  Which means there
> can be logical holes in the file between PT_LOAD segments, where we put
> the extra data needed to keep everything page aligned.

Agreed. If one modifies p_paddr then one will have to modify p->vaddr
too. And user space tools look at p->vaddr and where is the corresponding
physical address. Keeping p_vaddr and p_paddr intact makes sense.

Thanks
Vivek
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