linux-kernel - [PATCH] s390: ptrace: don't abuse PT

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Message-ID: <20091209194651.GA24919@redhat.com>
Date:	Wed, 9 Dec 2009 20:46:51 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Heiko Carstens <heiko.carstens@...ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Roland McGrath <roland@...hat.com>, linux-s390@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] s390: ptrace: don't abuse PT_PTRACED

Untested, but hopefully trivial enough and should't change the
compiled code.

Nobody except ptrace itself should use task->ptrace or PT_PTRACED
directly, change arch/s390/kernel/traps.c to use the helper.

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

 arch/s390/kernel/traps.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- V1/arch/s390/kernel/traps.c~S390_DONT_ABUSE_PT_PTRACED	2009-04-06 00:03:36.000000000 +0200
+++ V1/arch/s390/kernel/traps.c	2009-12-09 20:31:49.000000000 +0100
@@ -18,7 +18,7 @@
 #include <linux/kernel.h>
 #include <linux/string.h>
 #include <linux/errno.h>
-#include <linux/ptrace.h>
+#include <linux/tracehook.h>
 #include <linux/timer.h>
 #include <linux/mm.h>
 #include <linux/smp.h>
@@ -382,7 +382,7 @@ void __kprobes do_single_step(struct pt_
 					SIGTRAP) == NOTIFY_STOP){
 		return;
 	}
-	if ((current->ptrace & PT_PTRACED) != 0)
+	if (tracehook_consider_fatal_signal(current, SIGTRAP))
 		force_sig(SIGTRAP, current);
 }
 
@@ -483,7 +483,7 @@ static void illegal_op(struct pt_regs * 
 		if (get_user(*((__u16 *) opcode), (__u16 __user *) location))
 			return;
 		if (*((__u16 *) opcode) == S390_BREAKPOINT_U16) {
-			if (current->ptrace & PT_PTRACED)
+			if (tracehook_consider_fatal_signal(current, SIGTRAP))
 				force_sig(SIGTRAP, current);
 			else
 				signal = SIGILL;

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