linux-kernel - Re: [TOMOYO 05/15](repost) Domain transition handler functions.

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Date:	Wed, 3 Oct 2007 23:56:28 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	yoshfuji@...ux-ipv6.org, a.p.zijlstra@...llo.nl
Cc:	kaigai@...gai.gr.jp, jmorris@...ei.org,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, chrisw@...s-sol.org
Subject: Re: [TOMOYO 05/15](repost) Domain transition handler functions.

Hello.


YOSHIFUJI Hideaki wrote:
> It is not a good practice.  Please free such objects.
> BTW, how many objects do you have in the list?
It varies from 0 to some thousands,
depending on the policy supplied by the administrator and/or the policy appended by "learning mode".


Peter Zijlstra wrote:
> sounds like a might fine memory leak / dos attack.
TOMOYO Linux keeps the policy in CD-R's manner.
Thus, once an entry is written, it's pointer is valid forever.
TOMOYO Linux's simplicity (singly-linked list with no read_lock) comes from
this "keep the policy in CD-R's manner".
Yes, it is a kind of memory leak, but is controllable.

The kernel no longer requires memory after entering into "enforcing mode".
So, attackers can't do DoS attack after entering into "enforcing mode".


Regards.

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