Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Liam Howlett <liam.howlett@oracle.com>
To:     "maple-tree@lists.infradead.org" <maple-tree@lists.infradead.org>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>
CC:     Song Liu <songliubraving@fb.com>,
        Davidlohr Bueso <dave@stgolabs.net>,
        "Paul E . McKenney" <paulmck@kernel.org>,
        Matthew Wilcox <willy@infradead.org>,
        Laurent Dufour <ldufour@linux.ibm.com>,
        David Rientjes <rientjes@google.com>,
        Axel Rasmussen <axelrasmussen@google.com>,
        Suren Baghdasaryan <surenb@google.com>,
        Vlastimil Babka <vbabka@suse.cz>,
        Rik van Riel <riel@surriel.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Michel Lespinasse <walken.cr@gmail.com>,
        Liam Howlett <liam.howlett@oracle.com>
Subject: [PATCH 73/94] kernel/sys: Use maple tree iterators instead of linked
 list
Thread-Topic: [PATCH 73/94] kernel/sys: Use maple tree iterators instead of
 linked list
Thread-Index: AQHXPEQ+t/6sqQAiVE6cX7NSbyvWFQ==
Date:   Wed, 28 Apr 2021 15:36:23 +0000
Message-ID: <20210428153542.2814175-74-Liam.Howlett@Oracle.com>
References: <20210428153542.2814175-1-Liam.Howlett@Oracle.com>
In-Reply-To: <20210428153542.2814175-1-Liam.Howlett@Oracle.com>
Accept-Language: en-US
Content-Language: en-US
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
X-MS-Exchange-CrossTenant-Network-Message-Id: f5dd269b-44e0-4ad3-b1fa-08d90a5b84d8
X-MS-Exchange-CrossTenant-originalarrivaltime: 28 Apr 2021 15:36:23.7186
 (UTC)
X-MS-Exchange-CrossTenant-fromentityheader: Hosted
X-MS-Exchange-CrossTenant-id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b
X-MS-Exchange-CrossTenant-mailboxtype: HOSTED
X-MS-Exchange-CrossTenant-userprincipalname: 3kDlvRNCfYlT5aQcGNeuVeycKh20cfVqF2KQSeAZDhvjlsFwuuGLx+jRGFSwlURq+n8EmnLOH+CUtJ3+SEElAw==
X-MS-Exchange-Transport-CrossTenantHeadersStamped: CO1PR10MB4548
X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9968 signatures=668683
X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 spamscore=0 adultscore=0
 suspectscore=0 mlxscore=0 mlxlogscore=999 malwarescore=0 bulkscore=0
 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104060000
 definitions=main-2104280101
X-Proofpoint-ORIG-GUID: mFG1y0wrxwEogePe6RjQABtj8gD4VPBZ
X-Proofpoint-GUID: mFG1y0wrxwEogePe6RjQABtj8gD4VPBZ
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
---
 kernel/sys.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/kernel/sys.c b/kernel/sys.c
index 3a583a29815f..3a33ef07cc22 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1864,9 +1864,11 @@ static int prctl_set_mm_exe_file(struct mm_struct *m=
m, unsigned int fd)
 	err =3D -EBUSY;
 	if (exe_file) {
 		struct vm_area_struct *vma;
+		MA_STATE(mas, &mm->mm_mt, 0, 0);
=20
 		mmap_read_lock(mm);
-		for (vma =3D mm->mmap; vma; vma =3D vma->vm_next) {
+		rcu_read_lock();
+		mas_for_each(&mas, vma, ULONG_MAX) {
 			if (!vma->vm_file)
 				continue;
 			if (path_equal(&vma->vm_file->f_path,
@@ -1874,6 +1876,7 @@ static int prctl_set_mm_exe_file(struct mm_struct *mm=
, unsigned int fd)
 				goto exit_err;
 		}
=20
+		rcu_read_unlock();
 		mmap_read_unlock(mm);
 		fput(exe_file);
 	}
@@ -1888,6 +1891,7 @@ static int prctl_set_mm_exe_file(struct mm_struct *mm=
, unsigned int fd)
 	fdput(exe);
 	return err;
 exit_err:
+	rcu_read_unlock();
 	mmap_read_unlock(mm);
 	fput(exe_file);
 	goto exit;
--=20
2.30.2