On 2020-01-01, Al Viro [off-list ref] wrote:
On Thu, Jan 02, 2020 at 01:44:07AM +1100, Aleksa Sarai wrote:
quoted
Thanks, this fixes the issue for me (and also fixes another reproducer I
found -- mounting a symlink on top of itself then trying to umount it).
Reported-by: Aleksa Sarai <redacted>
Tested-by: Aleksa Sarai <redacted>
Pushed into #fixes.
Thanks. One other thing I noticed is that umount applies to the
underlying symlink rather than the mountpoint on top. So, for example
(using the same scripts I posted in the thread):
# ln -s /tmp/foo link
# ./mount_to_symlink /etc/passwd link
# umount -l link # will attempt to unmount "/tmp/foo"
Is that intentional?
--
Aleksa Sarai
Senior Software Engineer (Containers)
SUSE Linux GmbH
<https://www.cyphar.com/>