linux-kernel - Re: ipc,sem: sysv semaphore scalability

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Date:	Fri, 29 Mar 2013 15:33:05 -0400
From:	Peter Hurley <peter@...leysoftware.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Dave Jones <davej@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...riel.com>,
	Davidlohr Bueso <davidlohr.bueso@...com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	hhuang@...hat.com, "Low, Jason" <jason.low2@...com>,
	Michel Lespinasse <walken@...gle.com>,
	Larry Woodman <lwoodman@...hat.com>,
	"Vinod, Chegu" <chegu_vinod@...com>,
	Stanislav Kinsbursky <skinsbursky@...allels.com>
Subject: Re: ipc,sem: sysv semaphore scalability

On Fri, 2013-03-29 at 11:43 -0700, Linus Torvalds wrote:
> I think I foud at least one bug in the MSG_COPY stuff: it leaks the
> "copy" allocation if
> 
>     mode == SEARCH_LESSEQUAL
> 
> but maybe I'm misreading it.

Yes, you're misreading it. copy_msg() returns the 'copy' address when
copying is successful. So this patch double-frees 'copy'.

Andrew has had the patches that fix this for a month but because they're
fairly extensive he didn't want to apply them for 3.9.

Regards,
Peter


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