linux-kernel - Re: [PATCH, take4] FUTEX : new PRIVATE futexes

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Message-ID: <461CAD0D.3040609@yahoo.com.au>
Date:	Wed, 11 Apr 2007 19:40:29 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Nick Piggin <nickpiggin@...oo.com.au>
CC:	Pierre Peiffer <pierre.peiffer@...l.net>,
	Eric Dumazet <dada1@...mosbay.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Jones <davej@...hat.com>,
	Ulrich Drepper <drepper@...il.com>,
	Ingo Molnar <mingo@...e.hu>, Andi Kleen <ak@...e.de>,
	Ravikiran G Thirumalai <kiran@...lex86.org>,
	"Shai Fultheim (Shai@...lex86.org)" <shai@...lex86.org>,
	pravin b shelar <pravin.shelar@...softinc.com>,
	linux-kernel@...r.kernel.org, Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [PATCH, take4] FUTEX : new PRIVATE futexes

Nick Piggin wrote:
> Pierre Peiffer wrote:
> 
>> Nick Piggin a écrit :
>>
>>>
>>> But... that isn't there in mainline. Why is it in -mm?
>>
>>
>>
>> This was introduced by lguest code....
>> I did not follow exaclty why.
> 
> 
> OK, that's no problem, then it can remain exported but we just
> have to document and audit that callers must pass in an aligned
> address. We can also BUG_ON(address & ~PAGE_MASK); to handle
> the security aspect.

Err, duh no we can't because we don't know the size, which is the
whole point :P

Anyway.... just ensure callers have to fix alignment.

-- 
SUSE Labs, Novell Inc.
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