linux-kernel - Re: [RFC][PATCH] Security: fix cap_file_mmap() off-by-one error to avoid kernel null pointer exploit

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Date:	Thu, 15 Apr 2010 20:27:45 +0800
From:	wzt wzt <wzt.wzt@...il.com>
To:	Eric Paris <eparis@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, jmorris@...ei.org,
	eparis@...isplace.org
Subject: Re: [RFC][PATCH] Security: fix cap_file_mmap() off-by-one error to 
	avoid kernel null pointer exploit

> The fix to the comment is fine, but you missed the point ENTIRELY.
i'll send a new patch only fix the comment.

> The WHOLE point of being able to set dac_mmap_min_addr == 0 is so you can
> disable the protection.  There exist tools (wine and dosemu) which NEED
> to map the 0 page.
 thanks for explain it, i really understood wrong before.
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