linux-kernel - Re: [PATCH] signals: check_kill_permission: don't check creds if same_thread

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Date:	Thu, 20 May 2010 13:02:25 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Andrew Tridgell <tridge@...ba.org>,
	David Howells <dhowells@...hat.com>,
	Eric Paris <eparis@...isplace.org>,
	Jakub Jelinek <jakub@...hat.com>,
	James Morris <jmorris@...ei.org>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] signals: check_kill_permission: don't check creds if
 same_thread_group()

> So... which kernel(s) do we think this fix should be merged into?

I'd say all.  The glibc (libpthread) that does set*id across threads has
been in use for a while (2.3.4?), probably in distro's using kernels as old
or older than any active -stable streams.  In the race in question, this
kernel bug is breaking valid POSIX application expectations.


Thanks,
Roland
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