Date: Thu, 1 Apr 2004 18:21:27 -0800
From: Chris Wright <chrisw@osdl.org>
To: Andrea Arcangeli <andrea@suse.de>
Cc: Chris Wright <chrisw@osdl.org>, Andrew Morton <akpm@osdl.org>,
       linux-kernel@vger.kernel.org, kenneth.w.chen@intel.com
Subject: Re: disable-cap-mlock
Message-ID: <20040401182122.Y21045@build.pdx.osdl.net>
References: <20040401135920.GF18585@dualathlon.random> <20040401170705.Y22989@build.pdx.osdl.net> <20040402011804.GL18585@dualathlon.random> <20040401173014.Z22989@build.pdx.osdl.net> <20040402013547.GM18585@dualathlon.random> <20040401180441.B22989@build.pdx.osdl.net> <20040402021323.GP18585@dualathlon.random>
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* Andrea Arcangeli (andrea@suse.de) wrote:
> that has nothing to do with freeing the page, that's just releasing 1
> refcount, because you dropped the pte mapping, the page is still there
> healthy in the pagecache ready for somebody else to shmat. If you were
> right then a shmdt+shmat would corrupt the SGA.

Ah, yes I see what you are saying.  This is the same issue with normal
pages and SHM_LOCK that I mentioned earlier, I believe.  I don't see the
best solution, because once you detach w/out any destroy, there could be
nobody to assign the accounting to.  Do you agree?

thanks,
-chris
-- 
Linux Security Modules     http://lsm.immunix.org     http://lsm.bkbits.net
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