linux-kernel - Re: sys

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Message-ID: <20120924203512.GF24172@moon>
Date:	Tue, 25 Sep 2012 00:35:12 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Mark Salter <msalter@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Russell King <rmk@....linux.org.uk>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Kees Cook <keescook@...omium.org>,
	linux-kernel@...r.kernel.org,
	Linux-Arch <linux-arch@...r.kernel.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Pavel Emelyanov <xemul@...allels.com>
Subject: Re: sys_kcmp

On Mon, Sep 24, 2012 at 10:51:19PM +0400, Cyrill Gorcunov wrote:
> > I expect what you want is a call to access_ok, rather than hard coding
> > details about task layout here.  This test certainly looks wrong
> > for a 32bit process on a 64bit kernel. If I read your test right it
> > appears I can set values of say 0x100000000 on a 32bit process...
> > 
> > As for mmap_min_addr I would expect your find_vma check would make that
> > test unnecessary, simply by not finding a vma...
> 
> Good point, Eric, thanks! I'm cooking a new patch now.

Btw, Eric, I somehow miss one bit -- how would you set this 0x100000000
if TASK_SIZE is a macro which does check for TIF_ADDR32 and sets limit
acordingly? What i'm missing?
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