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[Launchpad Bug Tracker <1347746@xxxxxxxxxxxxxxxxxx>]

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Overlayfs breaks /proc/self/exe link when mounted not to VFS root.
This issue, for example, breaks clang which uses /proc/self/exe to recursively exec self.

Test case:
$ mkdir /tmp/bug/ && cd /tmp/bug
$ mkdir lower upper mount
$ cp `which readlink` upper
$ sudo mount -t overlayfs -o lowerdir=lower,upperdir=upper none mount
$ ./upper/readlink /proc/self/exe
/tmp/bug/upper/readlink
$ ./mount/readlink /proc/self/exe
/readlink

At the same time aufs don't break /proc/self/exe:
$ sudo umount mount/
$ sudo mount -t aufs -o noxino,br=upper:lower none mount/
$ ./mount/readlink /proc/self/exe
/tmp/bug/mount/readlink

** Affects: linux-meta (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: overlayfs
-- 
Overlayfs breaks /proc/self/exe link
https://bugs.launchpad.net/bugs/1347746
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