From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeremy Fitzhardinge <jeremy@goop.org>
Subject: Re: [RESEND] [PATCH] VFS: make file->f_pos access atomic on 32bit
 arch
Date: Thu, 09 Oct 2008 10:29:31 -0700
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References: <6.0.0.20.2.20081007140438.0580f110@172.19.0.2> <20081007105056.16d9e785.akpm@linux-foundation.org> <1223405963.26330.83.camel@lappy.programming.kicks-ass.net> <200810081335.44576.nickpiggin@yahoo.com.au> <20081008025209.GO25780@parisc-linux.org> <20081009122319.GC1623@ucw.cz>
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Cc: Matthew Wilcox <matthew@wil.cx>,
	Nick Piggin <nickpiggin@yahoo.com.au>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	torvalds@linux-foundation.org,
	Andrew Morton <akpm@linux-foundation.org>,
	Andi Kleen <andi@firstfloor.org>,
	Hisashi Hifumi <hifumi.hisashi@oss.ntt.co.jp>,
	linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
	Theodore Ts'o <tytso@mit.edu>
To: Pavel Machek <pavel@suse.cz>
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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