linux-kernel - Re: {2.6.22.y} CVE-2007-6434

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Message-ID: <6101e8c40802041214i78094f00kde109c7a22bed5ec@mail.gmail.com>
Date:	Mon, 4 Feb 2008 21:14:37 +0100
From:	"Oliver Pinter" <oliver.pntr@...il.com>
To:	stable@...nel.org
Cc:	linux-kernel@...r.kernel.org,
	"chrisw@...s-sol.org" <chrisw@...s-sol.org>,
	"Greg KH" <gregkh@...e.de>, "Willy Tarreau" <w@....eu>,
	"Adrian Bunk" <bunk@...nel.org>, "Nick Piggin" <npiggin@...e.de>
Subject: Re: {2.6.22.y} CVE-2007-6434

http://nvd.nist.gov/nvd.cfm?cvename=CVE-2007-6434

On 2/4/08, Oliver Pinter <oliver.pntr@...il.com> wrote:
> mainline: ecaf18c15aac8bb9bed7b7aa0e382fe252e275d5
>
> --->8---
> commit ecaf18c15aac8bb9bed7b7aa0e382fe252e275d5
> Author: Eric Paris <eparis@...hat.com>
> Date:   Tue Dec 4 23:45:31 2007 -0800
>
>     VM/Security: add security hook to do_brk
>
>     Given a specifically crafted binary do_brk() can be used to get low
> pages
>     available in userspace virtual memory and can thus be used to circumvent
>     the mmap_min_addr low memory protection.  Add security checks in
> do_brk().
>
>     Signed-off-by: Eric Paris <eparis@...hat.com>
>     Acked-by: Alan Cox <alan@...hat.com>
>     Cc: Stephen Smalley <sds@...ho.nsa.gov>
>     Cc: James Morris <jmorris@...ei.org>
>     Cc: Chris Wright <chrisw@...s-sol.org>
>     Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
>     Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
>
> diff --git a/mm/mmap.c b/mm/mmap.c
> index facc1a7..acfc13f 100644
> --- a/mm/mmap.c
> +++ b/mm/mmap.c
> @@ -1934,6 +1934,10 @@ unsigned long do_brk(unsigned long addr, unsigned
> long le
>         if (is_hugepage_only_range(mm, addr, len))
>                 return -EINVAL;
>
> +       error = security_file_mmap(0, 0, 0, 0, addr, 1);
> +       if (error)
> +               return error;
> +
>         flags = VM_DATA_DEFAULT_FLAGS | VM_ACCOUNT | mm->def_flags;
>
>         error = arch_mmap_check(addr, len, flags);
> ---8<---
> --
> Thanks,
> Oliver
>


-- 
Thanks,
Oliver
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