linux-kernel - Re: [PATCH v2] ipc/shm: fix the historical/wrong mm->start

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Message-ID: <20140825212209.GQ25918@moon>
Date:	Tue, 26 Aug 2014 01:22:09 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Manfred Spraul <manfred@...orfullife.com>,
	Davidlohr Bueso <davidlohr.bueso@...com>,
	Kees Cook <keescook@...omium.org>, Tejun Heo <tj@...nel.org>,
	Andrew Vagin <avagin@...nvz.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Vasiliy Kulikov <segoon@...nwall.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Julien Tinnes <jln@...gle.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ipc/shm: fix the historical/wrong mm->start_stack
 check

On Mon, Aug 25, 2014 at 09:12:07PM +0200, Oleg Nesterov wrote:
> +		vma = find_vma(current->mm, addr);
> +		if (vma) {
> +			unsigned long end = addr + size;
> +
> +			if (vma->vm_flags & VM_GROWSDOWN)
> +				end += PAGE_SIZE * 5;
> +
> +			if (end < addr || end > vma->vm_start)
> +				goto invalid;

Looks good to me, but I somehow missed in first version of the patch
too the following aspect -- end > vma->vm_start? Maybe end >= vma->vm_end?
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