linux-kernel - [PATCH 3/7] ptrace_signal: check PT_PTRACED before reporting a signal

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Message-ID: <20091218011128.GA29552@redhat.com>
Date:	Fri, 18 Dec 2009 02:11:28 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Alexey Dobriyan <adobriyan@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Ananth Mavinakayanahalli <ananth@...ibm.com>,
	Christoph Hellwig <hch@...radead.org>,
	"Frank Ch. Eigler" <fche@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Roland McGrath <roland@...hat.com>,
	linux-kernel@...r.kernel.org, utrace-devel@...hat.com
Subject: [PATCH 3/7] ptrace_signal: check PT_PTRACED before reporting a
	signal

No functional changes, preparation for utrace-ptrace.

Change ptrace_signal() to check PT_PTRACED instead of task_ptrace() != 0.
Currently this is the same, PT_PTRACED must be always set if the task is
ptraced.

This change is needed to make sure ptrace_signal() does nothing if ptrace
is implemented on top of utrace, eventually this code will be removed
completely.

Signed-off-by: Roland McGrath <roland@...hat.com>
Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---

 kernel/signal.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- V1/kernel/signal.c~3_PTRACE_SIGNAL_CK_PTRACED	2009-12-18 00:20:50.000000000 +0100
+++ V1/kernel/signal.c	2009-12-18 00:48:35.000000000 +0100
@@ -1764,7 +1764,7 @@ static int do_signal_stop(int signr)
 static int ptrace_signal(int signr, siginfo_t *info,
 			 struct pt_regs *regs, void *cookie)
 {
-	if (!task_ptrace(current))
+	if (!(task_ptrace(current) & PT_PTRACED))
 		return signr;
 
 	ptrace_signal_deliver(regs, cookie);

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