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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/