linux-kernel - Re: [PATCH -mm] utrace: nommu fixup support utrace

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Date:	Tue,  6 Mar 2007 19:42:16 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	bryan.wu@...log.com
Cc:	David Howells <dhowells@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm] utrace: nommu fixup support utrace

That old ptrace check seems pretty questionable to me.  I think what you
want is for the nommu world's get_user_pages/access_process_vm when called
with force=1,write=1 on a read-only MAP_PRIVATE page to do something more
morally similar to the mmu world's COW than it does now.

Thanks,
Roland
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