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McKenney" , Matthew Wilcox , Laurent Dufour , David Rientjes , Axel Rasmussen , Suren Baghdasaryan , Vlastimil Babka , Rik van Riel , Peter Zijlstra , Michel Lespinasse , Liam Howlett Subject: [PATCH v2 44/61] kernel/sys: Use maple tree iterators instead of linked list Thread-Topic: [PATCH v2 44/61] kernel/sys: Use maple tree iterators instead of linked list Thread-Index: AQHXk38v9ujBrdymU0OFKW/9goe7DQ== Date: Tue, 17 Aug 2021 15:47:29 +0000 Message-ID: <20210817154651.1570984-45-Liam.Howlett@oracle.com> References: <20210817154651.1570984-1-Liam.Howlett@oracle.com> In-Reply-To: <20210817154651.1570984-1-Liam.Howlett@oracle.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.30.2 x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 1616fce2-a465-4182-066b-08d961966155 x-ms-traffictypediagnostic: DM6PR10MB3580: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:1303; 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Howlett" Signed-off-by: Liam R. Howlett --- kernel/sys.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/kernel/sys.c b/kernel/sys.c index 6ec50924b517..402d5da903fe 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -1876,9 +1876,11 @@ static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd) err = -EBUSY; if (exe_file) { struct vm_area_struct *vma; + MA_STATE(mas, &mm->mm_mt, 0, 0); mmap_read_lock(mm); - for (vma = mm->mmap; vma; vma = 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, @@ -1886,6 +1888,7 @@ static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd) goto exit_err; } + rcu_read_unlock(); mmap_read_unlock(mm); fput(exe_file); } @@ -1900,6 +1903,7 @@ 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;