linux-kernel - [PATCH 0/4] swapper fixes (Was: kernel panic on kill(0, SIGTERM) with PGID == 0)

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Message-ID: <20100510194917.GA5249@redhat.com>
Date:	Mon, 10 May 2010 21:49:17 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Cedric Le Goater <clg@...ibm.com>,
	Dave Hansen <haveblue@...ibm.com>,
	Eric Biederman <ebiederm@...ssion.com>,
	Herbert Poetzl <herbert@...hfloor.at>,
	Ingo Molnar <mingo@...e.hu>,
	Mathias Krause <Mathias.Krause@...unet.com>,
	Roland McGrath <roland@...hat.com>,
	Serge Hallyn <serue@...ibm.com>,
	Sukadev Bhattiprolu <sukadev@...ibm.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/4] swapper fixes (Was: kernel panic on kill(0, SIGTERM)
	with PGID == 0)

Hello,

Mathias Krause reports that a buggy (or special) /sbin/init can
crash the kernel if it sends a signal to its pgrp/sid before it
changes its initial (0,0) pids. See the changelog for 1/4.

git-bisect blames "start the global /sbin/init with 0,0 special pids"
commit 430c623121ea88ca80595c99fdc63b7f8a803ae5, but in fact the
problem was caused by another change, see 2/4.

The patches do not depend on each other, 3/4 fixes another problem,
4/4 is purely cosmetic.

Oleg.

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