linux-kernel - [PATCH 03/13] ptrace/arm: Revert "hw_breakpoints: Fix racy access to ptrace breakpoints"

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Message-ID: <20130513151706.GA6249@redhat.com>
Date:	Mon, 13 May 2013 17:17:06 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Jan Kratochvil <jan.kratochvil@...hat.com>,
	Michael Neuling <mikey@...ling.org>,
	Paul Mackerras <paulus@...ba.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	Prasad <prasad@...ux.vnet.ibm.com>,
	Russell King <linux@....linux.org.uk>,
	Will Deacon <will.deacon@....com>, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 03/13] ptrace/arm: Revert "hw_breakpoints: Fix racy access
	to ptrace breakpoints"

This reverts commit bf0b8f4b55e591ba417c2dbaff42769e1fc773b0.

The patch was fine but we can no longer race with SIGKILL after
9899d11f "ptrace: ensure arch_ptrace/ptrace_request can never race
with SIGKILL", the __TASK_TRACED tracee can't be woken up and
->ptrace_bps[] can't go away.

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
Acked-by: Will Deacon <will.deacon@....com>
---
 arch/arm/kernel/ptrace.c |    8 --------
 1 files changed, 0 insertions(+), 8 deletions(-)

diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c
index 03deeff..41668e5 100644
--- a/arch/arm/kernel/ptrace.c
+++ b/arch/arm/kernel/ptrace.c
@@ -886,20 +886,12 @@ long arch_ptrace(struct task_struct *child, long request,
 
 #ifdef CONFIG_HAVE_HW_BREAKPOINT
 		case PTRACE_GETHBPREGS:
-			if (ptrace_get_breakpoints(child) < 0)
-				return -ESRCH;
-
 			ret = ptrace_gethbpregs(child, addr,
 						(unsigned long __user *)data);
-			ptrace_put_breakpoints(child);
 			break;
 		case PTRACE_SETHBPREGS:
-			if (ptrace_get_breakpoints(child) < 0)
-				return -ESRCH;
-
 			ret = ptrace_sethbpregs(child, addr,
 						(unsigned long __user *)data);
-			ptrace_put_breakpoints(child);
 			break;
 #endif
 
-- 
1.5.5.1

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