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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Ilya Leoshkevich <iii@linux.ibm.com>,
        Vasily Gorbik <gor@linux.ibm.com>
Subject: [PATCH 4.19 001/114] s390/process: avoid potential reading of freed stack
Date:   Thu, 10 Oct 2019 10:35:08 +0200
Message-Id: <20191010083545.164292114@linuxfoundation.org>
In-Reply-To: <20191010083544.711104709@linuxfoundation.org>
References: <20191010083544.711104709@linuxfoundation.org>
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From: Vasily Gorbik <gor@linux.ibm.com>

commit 8769f610fe6d473e5e8e221709c3ac402037da6c upstream.

With THREAD_INFO_IN_TASK (which is selected on s390) task's stack usage
is refcounted and should always be protected by get/put when touching
other task's stack to avoid race conditions with task's destruction code.

Fixes: d5c352cdd022 ("s390: move thread_info into task_struct")
Cc: stable@vger.kernel.org # v4.10+
Acked-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/s390/kernel/process.c |   22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -183,20 +183,30 @@ unsigned long get_wchan(struct task_stru
 
 	if (!p || p == current || p->state == TASK_RUNNING || !task_stack_page(p))
 		return 0;
+
+	if (!try_get_task_stack(p))
+		return 0;
+
 	low = task_stack_page(p);
 	high = (struct stack_frame *) task_pt_regs(p);
 	sf = (struct stack_frame *) p->thread.ksp;
-	if (sf <= low || sf > high)
-		return 0;
+	if (sf <= low || sf > high) {
+		return_address = 0;
+		goto out;
+	}
 	for (count = 0; count < 16; count++) {
 		sf = (struct stack_frame *) sf->back_chain;
-		if (sf <= low || sf > high)
-			return 0;
+		if (sf <= low || sf > high) {
+			return_address = 0;
+			goto out;
+		}
 		return_address = sf->gprs[8];
 		if (!in_sched_functions(return_address))
-			return return_address;
+			goto out;
 	}
-	return 0;
+out:
+	put_task_stack(p);
+	return return_address;
 }
 
 unsigned long arch_align_stack(unsigned long sp)