** Changed in: linux (Ubuntu)
Importance: Undecided => High
** Tags added: kernel-da-key xenial
** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Xenial)
Importance: Undecided => High
** Changed in: linux (Ubuntu Xenial)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1659087
Title:
open(2) returns EOVERFLOW within tmpfs+userns
Status in linux package in Ubuntu:
Confirmed
Status in linux source package in Xenial:
Confirmed
Bug description:
On Ubuntu 4.4.0-59.80-generic 4.4.35, open(2) returns EOVERFLOW when
creating a file in tmpfs with user namespace enabled.
This issue wasn't present in 4.4.0-47 and has probably been introduced
by https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1634964
Step to reproduce:
$ unshare -r -U -m /bin/bash
# mount -t tmpfs tmpfs /mnt
# echo $$
2354
In another terminal:
$ sudo nsenter -t 2354 -m
# touch /mnt/foo
touch: cannot touch '/mnt/foo': Value too large for defined data type
Note that we are not joining the user namespace when creating the file
but we would expect `touch' to succeed and create the file with an
inode set to INVALID_UID/GID (i.e. nobody:nogroup) within the mount
namespace.
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