[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1397649
Title:
remounting root read-only in private mount namespace affects main
namespace
Status in linux package in Ubuntu:
Expired
Bug description:
When remounting root read-only in a private mount namespace, then also
the real root (in default namespace) is read-only.
However, it is then possible to remount the real root read-write, and
this doesn't (fortunately...) affect the other namespace.
How to reproduce:
-----------------------------
(in one console):
# unshare --mount /bin/bash
# mount -o remount -r /
(in other console)
# touch /x
touch: cannot touch `/x': Read-only file system
# mount -o remount -w /
# touch /x
(in first console)
# touch /x
touch: cannot touch `/x': Read-only file system
What happened:
--------------------------
Read-only mount performed in private mount namespace affected main (default)
namespace
What should have happened:
-----------------------------------------------
The read-only mount should not have affected the main namespace
(this has been seen in 3.0.0 and also 3.4.0 on precise)
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ApportVersion: 2.0.1-0ubuntu17.7
Architecture: amd64
DistroRelease: Ubuntu 12.04
MarkForUpload: True
NonfreeKernelModules: nvidia
Package: linux (not installed)
Tags: precise
Uname: Linux 3.4.0-030400-generic x86_64
UnreportableReason: The running kernel is not an Ubuntu kernel
UpgradeStatus: Upgraded to precise on 2012-10-06 (784 days ago)
UserGroups:
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