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Sun, 8 Apr 2018 20:19:36 -0400 From: Sasha Levin To: "stable@vger.kernel.org" , "linux-kernel@vger.kernel.org" CC: Yisheng Xie , Andi Kleen , Chris Salls , Christopher Lameter , David Rientjes , Ingo Molnar , Naoya Horiguchi , Tan Xiaojun , Andrew Morton , Linus Torvalds , Sasha Levin Subject: [PATCH AUTOSEL for 4.15 120/189] mm/mempolicy: add nodes_empty check in SYSC_migrate_pages Thread-Topic: [PATCH AUTOSEL for 4.15 120/189] mm/mempolicy: add nodes_empty check in SYSC_migrate_pages Thread-Index: AQHTz5hEPrB6lLYRukm84/AcHaLVcA== Date: Mon, 9 Apr 2018 00:18:21 +0000 Message-ID: <20180409001637.162453-120-alexander.levin@microsoft.com> References: <20180409001637.162453-1-alexander.levin@microsoft.com> In-Reply-To: <20180409001637.162453-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;DM5PR2101MB0726;7:Iu3rpKHF0JIUxtOoI2EdH+TyZhWHNs1uhWQwneMKiUsWJxdn5pi7h48+1a8Bw3zjjNZ6hZsqyB8NMCbL6y9ly5ORf1lX8tGUsvcGRl8sHrkkQzWAmsmY5/bpPMTiJiDmhS8TBwXNfAs2mkMaKAAVONYYHeCn07JyvtMAGX1dtmy0bK43u0rjp2Tu/4uojh3jx6RnIFJn5w9uMkj0SitOIsZufOgZ29J4eb0lrOUnYsKMqDRPsLyeZqqGTWZafrKq;20:SsgfdCfRPgiclsaEdNglF/qisZ/NhCEEqh6W5tGEmj4bPlmfWE5lTQCKM6sbaZZS0zHGc3SP8XwKv66tiF1Jb4zmcZDbUAa+AR+m2fVkzCrJt7VN3uQp6EJBpGe7yxnOur7lCzcPPp1iVmHA9p0vSFZU5Juiwchu31l8xydy2jM= x-ms-office365-filtering-ht: Tenant X-MS-Office365-Filtering-Correlation-Id: 22d1f294-2c4f-4a2d-de52-08d59daf9000 x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB0726; 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x-microsoft-antispam-message-info: vIsHqdCRek35WEkPM8LbPGrKcIehTRoCr2xYMwF3sLQ82EkyaTUhP5FvD0rjWuTvB6W/qHe47Q2oljf77JjqwnDISt04sTWpoZUOnRZNBmb5WmR9MsGCf9YBhDCkpVQzHOP+2d3jfLEl86JbWPpD1GWbLpMCZi8yq8DuXIS8CoGJJVx/36raH/s/BG89n9qubZLk5n/Cyk00ggrkmah5n+RNtar/mYpzZvLmtJLzr76tB6TYd2ZO2ibQNMmbKwCFdbRs9VPFILy3z9dUjikf6zODSUVtjia6/Q8NaV1QqtN3TFmUCWILGcrJhquTkdlb6po20CbVr/R+b9WG8YHpQf4iKqfTYaiY/iFEQOWoAsDnsaQUmxVJxBhMdhmzsZ6poaf82Y3hmehZOlLHL3vMWRIAd+WR6LGSD+gh+YKIu0s= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 22d1f294-2c4f-4a2d-de52-08d59daf9000 X-MS-Exchange-CrossTenant-originalarrivaltime: 09 Apr 2018 00:18:21.8648 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB0726 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Yisheng Xie [ Upstream commit 0486a38bcc4749808edbc848f1bcf232042770fc ] As in manpage of migrate_pages, the errno should be set to EINVAL when none of the node IDs specified by new_nodes are on-line and allowed by the process's current cpuset context, or none of the specified nodes contain memory. However, when test by following case: new_nodes =3D 0; old_nodes =3D 0xf; ret =3D migrate_pages(pid, old_nodes, new_nodes, MAX); The ret will be 0 and no errno is set. As the new_nodes is empty, we should expect EINVAL as documented. To fix the case like above, this patch check whether target nodes AND current task_nodes is empty, and then check whether AND node_states[N_MEMORY] is empty. Link: http://lkml.kernel.org/r/1510882624-44342-4-git-send-email-xieyisheng= 1@huawei.com Signed-off-by: Yisheng Xie Acked-by: Vlastimil Babka Cc: Andi Kleen Cc: Chris Salls Cc: Christopher Lameter Cc: David Rientjes Cc: Ingo Molnar Cc: Naoya Horiguchi Cc: Tan Xiaojun Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- mm/mempolicy.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/mm/mempolicy.c b/mm/mempolicy.c index c9b807eca74c..277b6454954e 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1435,10 +1435,14 @@ SYSCALL_DEFINE4(migrate_pages, pid_t, pid, unsigned= long, maxnode, goto out_put; } =20 - if (!nodes_subset(*new, node_states[N_MEMORY])) { - err =3D -EINVAL; + task_nodes =3D cpuset_mems_allowed(current); + nodes_and(*new, *new, task_nodes); + if (nodes_empty(*new)) + goto out_put; + + nodes_and(*new, *new, node_states[N_MEMORY]); + if (nodes_empty(*new)) goto out_put; - } =20 err =3D security_task_movememory(task); if (err) --=20 2.15.1