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ANDROID: mm: page_pinner: use put_user_page at access_remote_vm

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/proc/<pid>/cmdline calls __get_user_pages_remote indirectly
so close the false positive reporting by using put_user_page.

Page pinned via pid 792, ts 11450624760 ns
PFN 220828 Block 431 type Movable Flags 0xfffffc0080036(referenced|uptodate|lru|active|swapbacked)
 try_grab_page+0x144/0x160
 follow_page_mask+0x4a1/0x630
 __get_user_pages+0x24e/0x760
 __get_user_pages_remote+0xd4/0x320
 __access_remote_vm+0x110/0x390
 proc_pid_cmdline_read+0x16a/0x3f0
 vfs_read+0x98/0x180
 ksys_read+0x5f/0xe0
 do_syscall_64+0x33/0x80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Bug: 183414571
Signed-off-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Minchan Kim <minchan@google.com>
Change-Id: I88625af49600b82f6f96157d69988fbda455d819
This commit is contained in:
Minchan Kim
2021-03-18 12:17:00 -07:00
committed by Minchan Kim
parent ddc4a48797
commit df9a9d821c
1 changed files with 1 additions and 1 deletions
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2
mm/memory.c
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@@ -5469,7 +5469,7 @@ int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm,
buf, maddr + offset, bytes);
}
kunmap(page);
put_page(page);
put_user_page(page);
}
len -= bytes;
buf += bytes;