From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-by2nam01on0096.outbound.protection.outlook.com ([104.47.34.96]:14896 "EHLO NAM01-BY2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S964788AbeCHFB3 (ORCPT ); Thu, 8 Mar 2018 00:01:29 -0500 From: Sasha Levin To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" CC: Maor Gottlieb , Leon Romanovsky , Doug Ledford , Sasha Levin Subject: [PATCH AUTOSEL for 4.9 067/190] IB/mlx5: Change vma from shared to private Date: Thu, 8 Mar 2018 04:59:21 +0000 Message-ID: <20180308045810.8041-67-alexander.levin@microsoft.com> References: <20180308045810.8041-1-alexander.levin@microsoft.com> In-Reply-To: <20180308045810.8041-1-alexander.levin@microsoft.com> Content-Language: en-US Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org List-ID: From: Maor Gottlieb [ Upstream commit 1377661298d2820d675553d186c31b6f46c140d0 ] Anonymous VMA (->vm_ops =3D=3D NULL) cannot be shared, otherwise it would lead to SIGBUS. Remove the shared flags from the vma after we change it to be anonymous. This is easily reproduced by doing modprobe -r while running a user-space application such as raw_ethernet_bw. Fixes: 7c2344c3bbf97 ('IB/mlx5: Implements disassociate_ucontext API') Signed-off-by: Maor Gottlieb Signed-off-by: Leon Romanovsky Signed-off-by: Doug Ledford Signed-off-by: Sasha Levin --- drivers/infiniband/hw/mlx5/main.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5= /main.c index 150227786969..d7da1dca765f 100644 --- a/drivers/infiniband/hw/mlx5/main.c +++ b/drivers/infiniband/hw/mlx5/main.c @@ -1323,6 +1323,7 @@ static void mlx5_ib_disassociate_ucontext(struct ib_u= context *ibcontext) /* context going to be destroyed, should * not access ops any more. */ + vma->vm_flags &=3D ~(VM_SHARED | VM_MAYSHARE); vma->vm_ops =3D NULL; list_del(&vma_private->list); kfree(vma_private); --=20 2.14.1