linux-kernel - Re: [PATCH] ipc: introduce ipc_valid_object() helper to sort out IPC

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Message-ID: <xr93vbynjjlh.fsf@gthelen.mtv.corp.google.com>
Date:	Tue, 17 Dec 2013 12:41:46 -0800
From:	Greg Thelen <gthelen@...gle.com>
To:	Rafael Aquini <aquini@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Davidlohr Bueso <davidlohr@...com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH] ipc: introduce ipc_valid_object() helper to sort out IPC_RMID races

On Tue, Dec 17 2013, Rafael Aquini wrote:

> After the locking semantics for the SysV IPC API got improved, a couple of
> IPC_RMID race windows were opened because we ended up dropping the
> 'kern_ipc_perm.deleted' check performed way down in ipc_lock().
> The spotted races got sorted out by re-introducing the old test within
> the racy critical sections.
>
> This patch introduces ipc_valid_object() to consolidate the way we cope with
> IPC_RMID races by using the same abstraction across the API implementation.
>
> Signed-off-by: Rafael Aquini <aquini@...hat.com>

Acked-by: Greg Thelen <gthelen@...gle.com>
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