linux-kernel - Re: [RESEND] [PATCH] VFS: make file->f

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Date:	Thu, 09 Oct 2008 10:29:31 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Pavel Machek <pavel@...e.cz>
CC:	Matthew Wilcox <matthew@....cx>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	torvalds@...ux-foundation.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Hisashi Hifumi <hifumi.hisashi@....ntt.co.jp>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Theodore Ts'o <tytso@....edu>
Subject: Re: [RESEND] [PATCH] VFS: make file->f_pos access atomic on 32bit
 arch

Pavel Machek wrote:
> We have append-only files, and normal users should not be able to work
> around that restriction.

Well, apparently Posix breaks this, and we're supposed to let pwrite() 
write anywhere in an O_APPEND file.  So any security-related argument 
goes out the window.

    J
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