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overlay: copy up and remove from another namespace

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Via unshare, copy up dir from lower dir then remove
them in another unshared namespace.

This would fail before v4.7 kernel with EPERM.

Kernel commit 3fe6e52f
  ovl: override creds with the ones from the superblock mounter
fixed this issue, with this reproducer provided. Original
reproducer was written by commit author:
Antonio Murdaca <amurdaca@redhat.com>

Signed-off-by: Xiong Zhou <xzhou@redhat.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
This commit is contained in:
Xiong Zhou
2017-01-04 16:59:11 +08:00
committed by Eryu Guan
parent fbe236d6a9
commit a1d861da98
3 changed files with 73 additions and 0 deletions
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tests/overlay/020.out
+2
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@@ -0,0 +1,2 @@
QA output created by 020
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