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Date: Mon, 21 Jan 2013 20:47:23 +0100
From: Oleg Nesterov <oleg@redhat.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Dan Carpenter <dan.carpenter@oracle.com>,
        Kernel Security <security@kernel.org>,
        Michael Davidson <md@google.com>,
        Suleiman Souhlal <suleiman@google.com>, Julien Tinnes <jln@google.com>,
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        Tony Luck <tony.luck@intel.com>, Fenghua Yu <fenghua.yu@intel.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: [PATCH v3 0/3] ptrace: ensure arch_ptrace/ptrace_request can never
	race with SIGKILL
Message-ID: <20130121194723.GA18775@redhat.com>
References: <20130118172854.GA29753@redhat.com> <20130118175224.GA520@redhat.com> <CA+55aFyEsU-pkX557A-m+xoGkA_v+fXEyA8z8HbJ5J8K1jObeg@mail.gmail.com> <20130118185559.GA3773@redhat.com> <CA+55aFy=newnMbx53HipyWbRs2mUUPSqXXCpSfDLW78gkro37g@mail.gmail.com> <20130120192448.GA6771@redhat.com> <20130120192527.GC6771@redhat.com> <CA+55aFx1+hFSCa4nX80C30BkEOugXRvBZ=7LA+u+KOq_qSaJsg@mail.gmail.com> <20130121172151.GA4691@redhat.com> <CA+55aFwRkvEP5YJy+a=TFgDX==YuU7CJ+D_U+B2s4e1LX-nz3g@mail.gmail.com>
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On 01/21, Linus Torvalds wrote:
>
> I guess that works then. It's a bit sad, but at least I see why you did it.

OK, please see v3 rebased on top of "unexport ptrace_check_attach()" you
already applied.

I tried to update the comment in ptrace_check_attach(), and changed unfreeze()
to simply do WARN_ON() without if/return.

There is also the cosmetic change in 1/3,

	-		ptrace_signal_wake_up(child, task_is_traced(child));
	+		ptrace_signal_wake_up(child, true);

in __ptrace_unlink().

Oleg.