linux-kernel - [tip:perf/urgent] arm, hw_breakpoints: Fix racy access to ptrace breakpoints

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Message-ID: <tip-bf0b8f4b55e591ba417c2dbaff42769e1fc773b0@git.kernel.org>
Date:	Wed, 4 May 2011 20:29:46 GMT
From:	tip-bot for Frederic Weisbecker <fweisbec@...il.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, will.deacon@....com, lethal@...ux-sh.org,
	fweisbec@...il.com, tglx@...utronix.de, oleg@...hat.com,
	prasad@...ux.vnet.ibm.com, mingo@...e.hu
Subject: [tip:perf/urgent] arm, hw_breakpoints: Fix racy access to ptrace breakpoints

Commit-ID:  bf0b8f4b55e591ba417c2dbaff42769e1fc773b0
Gitweb:     http://git.kernel.org/tip/bf0b8f4b55e591ba417c2dbaff42769e1fc773b0
Author:     Frederic Weisbecker <fweisbec@...il.com>
AuthorDate: Fri, 8 Apr 2011 17:29:36 +0200
Committer:  Frederic Weisbecker <fweisbec@...il.com>
CommitDate: Mon, 25 Apr 2011 17:35:18 +0200

arm, hw_breakpoints: Fix racy access to ptrace breakpoints

While the tracer accesses ptrace breakpoints, the child task may
concurrently exit due to a SIGKILL and thus release its breakpoints
at the same time. We can then dereference some freed pointers.

To fix this, hold a reference on the child breakpoints before
manipulating them.

Reported-by: Oleg Nesterov <oleg@...hat.com>
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Acked-by: Will Deacon <will.deacon@....com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Prasad <prasad@...ux.vnet.ibm.com>
Cc: Paul Mundt <lethal@...ux-sh.org>
Link: http://lkml.kernel.org/r/1302284067-7860-5-git-send-email-fweisbec@gmail.com
---
 arch/arm/kernel/ptrace.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c
index 2bf27f3..8182f45 100644
--- a/arch/arm/kernel/ptrace.c
+++ b/arch/arm/kernel/ptrace.c
@@ -767,12 +767,20 @@ 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
 
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