linux-kernel - Re: is this a bug of elf_core

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Message-ID: <20070629052243.GA9495@fattire.cabal.ca>
Date:	Fri, 29 Jun 2007 01:22:43 -0400
From:	Kyle McMartin <kyle@...artin.ca>
To:	ye janboe <janboe.ye@...il.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: is this a bug of elf_core_dump

On Fri, Jun 29, 2007 at 01:03:06PM +0800, ye janboe wrote:
> 			if (get_user_pages(current, current->mm, addr, 1, 0, 
> 			1,
> 						&page, &vma) <= 0) {
> 				DUMP_SEEK(PAGE_SIZE);
> 			} else {
> 
> 
> does get_user_pages directly use page variable which is not
> initialized is a bug?
> 

Why not look at mm/memory.c::get_user_pages and look at how it uses the
**pages argument? The fact that it is passing in the address of a
pointer to a struct page, along with the function name should be a big
hint as to what it is doing...

<spoiler>
more or less it is looking up the struct page pointer for the user address
passed in and returning it to the calling function via &page...
</spoiler>

Chees,
	Kyle M
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