linux-kernel - RE: [PATCH] Validate pointer when copying mount namespace.

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Date:	Wed, 29 Apr 2015 03:21:25 +0000
From:	"Ma, Xindong" <xindong.ma@...el.com>
To:	Al Viro <viro@...IV.linux.org.uk>
CC:	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] Validate pointer when copying mount namespace.

> Details, please.  How do you reproduce that behaviour?
> 
> I don't like that loop in its current form (it relies upon _not_ encountering the
> same ->mnt_root in the parts of tree we hadn't copied), but your change
> doesn't make it any better.  Seeing a reproducer would be useful in sorting it
> out; in this form the patch papers over the bug rather than fixing it.

The issue is reproduced during monkey test on android devices. Seems it's very hard to reproduce it again. I'll continue to perform the test and review the code.
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