linux-kernel - Re: BUG: mmapfile/writev spurious zero bytes (x86

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Message-ID: <485829A1.4020705@firstfloor.org>
Date:	Tue, 17 Jun 2008 23:16:17 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Bron Gondwana <brong@...tmail.fm>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Nick Piggin <npiggin@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rob Mueller <robm@...tmail.fm>, Ingo Molnar <mingo@...e.hu>
Subject: Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i386, bisected,
 reproducable)

Linus Torvalds wrote:
> 
> On Tue, 17 Jun 2008, Linus Torvalds wrote:
>> I don't think that code is reasonably salvageable. Damn. 
> 
> Hmm. Something like this *may* salvage it.
> 
> Untested, so far (I'll reboot and test soon enough), but even if it fixes 
> things, it's not really very good. 

If that fixes anything:
- The caller is broken because it shouldn't pass a faulting source to copy_to_user()
- And you broken copy_from_user error reporting which shares the same code

-Andi


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