linux-kernel - [PATCH] fix SEM_UNDO with namespaces, take 2

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Date:	Sun, 06 Apr 2008 18:26:05 +0200
From:	Manfred Spraul <manfred@...orfullife.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
CC:	"Serge E. Hallyn" <serue@...ibm.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Sukadev Bhattiprolu <sukadev@...ibm.com>
Subject: [PATCH] fix SEM_UNDO with namespaces, take 2

Hi,

below is the second attempt to fix SEM_UNDO + unshare():
lookup_undo (in ipc/sem.c) is not namespace-aware, thus all entries in 
sysvsem.undo_list must be from the same namespace.
The patch enforces that by detaching the current thread from 
sysvsem.undo_list in switch_task_namespaces() if the ipc namespace is 
changed.

The patch boots and passes simple sysvsem+unshare tests.

Signed-Off-By: Manfred Spraul <manfred@...orfullife.com>

View attachment "patch-namespace-detach" of type "text/plain" (1129 bytes)