> I had thought I should be able to reproduce it by mounting (in an
unprivileged user+mountns) an overlayfs where the underlay has, say,
"/etc/rc2.d/K" symlink, then rename K to S (as i assume the 'systemctl
disable dnsmasq is doing), but that did not work for me.
Fwiw, I think you need index=on e
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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Title:
fs: removing mandatory locks
Status in linux package i
Public bug reported:
Hello,
Upstream is dicussing the removal of mandatory locks. To actually do
this at some point distros will need to start disabling
CONFIG_MANDATORY_FILE_LOCKING. It seems our kernel still defaults to
CONFIG_MANDATORY_FILE_LOCKING=y. If feasible I'd like to propose
disabling
** Changed in: linux-meta-hwe-5.11 (Ubuntu)
Status: New => Confirmed
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Title:
REGRESSION: shiftfs lets sendfile
Public bug reported:
On
Linux wittgenstein 5.8.0-33-generic #36-Ubuntu SMP Wed Dec 9 09:14:40 UTC 2020
x86_64 x86_64 x86_64 GNU/Linux
Distributor ID: Ubuntu
Description:Ubuntu 20.10
Release:20.10
Codename: groovy
iwd manages to trigger the following warn:
[ 47.003606] NET:
> ip addr
1: lo: mtu 65536 qdisc noqueue state UNKNOWN group
default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2
Public bug reported:
On
Linux wittgenstein 5.8.0-33-generic #36-Ubuntu SMP Wed Dec 9 09:14:40 UTC 2020
x86_64 x86_64 x86_64 GNU/Linux
Distributor ID: Ubuntu
Description:Ubuntu 20.10
Release:20.10
Codename: groovy
iwd manages to trigger the following warn:
[ 47.003606] NET:
This needs to be backported to our 5.4 kernels.
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Title:
s390x broken with unknown syscall number on kernels < 5.8
Status in linux p
Public bug reported:
SRU Justification
Impact: On kernels prior to 5.8 when a task is in traced state (due to
audit, ptrace, or seccomp) s390x and a syscall is issued that the kernel
doesn't know about s390x will not return ENOSYS in r2 but instead will
return the syscall number. This breaks user
linux package in Ubuntu:
In Progress
Status in linux source package in Eoan:
Fix Committed
Bug description:
SRU Justification
Impact: The patch
commit cfaa482afb97e3c05d020af80b897b061109d51f
Author: Christian Brauner
Date: Tue Apr 14 22:26:53 2020 +0200
UBUNTU: SAUCE
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Changed in: linux (Ubuntu)
Status: Confirmed => In Progress
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Christian Brauner (cbrauner)
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** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
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Title:
lxc 1:4.0.2-0ubuntu1 ADT test failure with linux
Public bug reported:
SRU Justification
Impact: The patch
commit cfaa482afb97e3c05d020af80b897b061109d51f
Author: Christian Brauner
Date: Tue Apr 14 22:26:53 2020 +0200
UBUNTU: SAUCE: shiftfs: fix dentry revalidation
BugLink: https://bugs.launchpad.net/bugs/1872757
to fix https
** Tags removed: verification-needed-eoan
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Title:
shiftfs: fix btrfs snapshot deletion
Status
Confirmed this is fixed:
brauner@wittgenstein|~
> lxc shell f1-vm
root@f1-vm:~# lxc shell f1
root@f1:~# btrfs subvolume create my-subvol
root@f1:~# chown 1000:1000 my-subvol
root@f1:~# btrfs subvolume delete my-subvol
Delete subvolume (no-commit): '/root/my-subvol'
** Tags removed: verification-n
on
of subvolumes and only by userns root.
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Christian Brauner (cbrauner)
Status: Confirmed
** Changed in: linux (Ubuntu)
Status: New => Confirmed
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Christ
James, can you try this kernel, please: https://drive.google.com/open?id
=19iTwaFSYNS95_I-gD_rvFoV9cMAfy6io
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Title:
'shifted' (shift
So I've gone through codesearch on Debian and there are no users apart
from a bunch of defines for __NR_uselib when it isn't defined.
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Public bug reported:
We're currently planning to be more proactive in deprecating the
uselib() syscall similar to how we deprecated the sysctl() syscall. This
will be a long process of course but the starting point is to set
CONFIG_USELIB=n in all new Ubuntu versions. I spoke to Eric and
apparentl
I have a fix for this note, that this is a regression we introduced by
another fix. I also want to put this cautious note here so people better
understand why shiftfs has such bugs and why they are not simple idiot
regressions but rather intricate to fix:
Note, in general it's not advisable to
** Changed in: linux (Ubuntu)
Status: Incomplete => In Progress
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Christian Brauner (cbrauner)
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** Changed in: linux (Ubuntu)
Status: In Progress => Fix Committed
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Title:
shiftfs: broken shiftfs nesting
Status in linux p
** Changed in: linux (Ubuntu)
Status: In Progress => Fix Released
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Title:
shiftfs: Allow stacking overlayfs on top
Status in
** Changed in: linux (Ubuntu)
Status: In Progress => Fix Committed
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Title:
shiftfs: O_TMPFILE reports ESTALE
Status in linux
** Tags removed: verification-needed-eoan verification-needed-focal
** Tags added: verification-done-eoan verification-done-focal
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Tit
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Title:
shiftfs: O_TMPFILE reports ESTALE
Status
On Wed, May 06, 2020 at 10:32:19AM -, Kleber Sacilotto de Souza wrote:
> With the fixup patch applied, I could not reproduce the issue anymore on
> both Eoan and Focal running ubuntu_fan_smoke_test and
> ubuntu_docker_smoke_test.
Sweet, thank you and sorry for the rebase mess-up with Andrei's
Fix here:
https://lists.ubuntu.com/archives/kernel-team/2020-May/109617.html
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Title:
linux-image-5.0.0-35-generic breaks checkpointi
** Changed in: linux (Ubuntu)
Status: Confirmed => In Progress
** Changed in: linux (Ubuntu Eoan)
Status: Confirmed => In Progress
** Changed in: linux (Ubuntu Focal)
Status: New => In Progress
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Chris
Fix here:
https://lists.ubuntu.com/archives/kernel-team/2020-May/109617.html
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Title:
Unable to handle kernel pointer dereference in
Yeah, that patch is buggy and I think this might've been my fault
actually. The fix should be:
diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c
index 9d16fff5342a..fbec523a67c9 100644
--- a/fs/overlayfs/file.c
+++ b/fs/overlayfs/file.c
@@ -42,6 +42,7 @@ static struct file *ovl_open_realfile(
** Tags removed: verification-needed-eoan
** Tags added: verification-done-eoan
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Title:
shiftfs: O_TMPFILE reports ESTALE
Status in
** Changed in: linux (Ubuntu)
Status: Confirmed => In Progress
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Title:
linux-image-5.0.0-35-generic breaks checkpointing of c
** Description changed:
SRU Justification
Impact: Christian Kellner reported that creating temporary files via
O_TMPFILE shiftfs reports ESTALE. This can be reproduced via:
import tempfile
import os
-
def test():
- with tempfile.TemporaryFile() as fd:
- fd.write("
ithub.com/systemd/systemd/issues/14861
Regression Potential: Limited to shiftfs.
Test Case: Build a kernel with fix applied and run above reproducer.
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Christian Brauner (cbrauner)
Status: In Progress
** Changed in: linux
This should preferably be backported to all LTS kernels that support
shiftfs.
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Title:
shiftfs: broken shiftfs nesting
Status in lin
to the lowers mount to get around vfs layering restrictions.
Regression Potential: Limited to shiftfs.
Test Case: Built a kernel with the mentioned fix and ran the reproducer.
The issue was not reproducible.
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Christian Brauner
See
https://github.com/brauner/ubuntu-unstable/commits/2020-04-10/shiftfs_nesting
for fix.
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Title:
shiftfs: broken shiftfs nesting
On March 27, 2020 10:57:17 PM GMT+01:00, Seth Forshee
wrote:
>Applied the patches from linux-next, plus one additional fix I saw,
>"sysfs: fix static inline declaration of sysfs_groups_change_owner()".
>@Christian, please let me know if there are any other fixes we need to
>grab.
>
>** Changed in
** Tags removed: verification-needed-eoan
** Tags added: verification-done-eoan
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Title:
shiftfs: prevent lower dentries from going n
That's an old version, sorry. It's already in Dave's tree. The merge commit is
here:
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=ebb4a4bf76f164457184a3f43ebc1552416bc823
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The patch series has been acked upstream and is sitting in Dave Miller's
tree. We should backport it to 5.4!
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https://bugs.launchpad.net/bugs/1865359
Title:
sysfs: incorrec
Public bug reported:
SRU Justification
Impact:
patchsets.)
We have been struggling with a bug surrounding the ownership of network
device sysfs files when moving network devices between network
namespaces owned by different user namespaces reported by multiple
users.
Currently, when moving netw
the lower dentry before
calling vfs_unlink() on it and dput() it afterwards.
Regression Potential: Limited to shiftfs.
Test Case: Compiled a kernel with the fix and used the reproducer above
to verify that the kernel cannot be crashed anymore.
** Affects: linux (Ubuntu)
Importance: Undecide
On Tue, Jan 07, 2020 at 07:07:36PM -, Andrew Vagin wrote:
> The root cause of this fail is a wrong mount ID which is reported for
> file mappings:
If you have cycles to come up with a patch to fix this that would be
appreciated. Otherwise this will end up lower in my priority queue since
my ba
** Tags removed: verification-needed-disco verification-needed-eoan
** Tags added: verification-done-disco verification-done-eoan
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Tit
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Tit
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** Tags added: verification-done-disco verification-done-eoan
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Tit
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Title:
shiftfs: rework how shiftfs opens files
Sta
** Tags removed: verification-needed-disco verification-needed-eoan
** Tags added: verification-done-disco verification-done-eoan
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Tit
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Title:
overlayfs: allow with shiftfs as underlay
S
pport.
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Christian Brauner (cbrauner)
Status: In Progress
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Christian Brauner (cbrauner)
** Changed in: linux (Ubuntu)
Status: New => In Progress
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Y
t
on a fixed kernel and see that the call succeeds and the file is of the
expected size.
Target Kernels:
All LTS kernels with shiftfs support.
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Christian Brauner (cbrauner)
Status: In Progress
** Changed in: linux (U
** Tags removed: verification-needed-disco
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Title:
overlayfs: allow with shiftfs as underlay
mp&id=2aa8d8d04ca29c3269154e1d48855e498be8882f
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Christian Brauner (cbrauner)
Status: In Progress
** Changed in: linux (Ubuntu)
Status: New => In Progress
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Ch
rn code to trap to userspace")
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Christian Brauner (cbrauner)
Status: In Progress
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Christian Brauner (cbrauner)
** Changed in: linux (Ubuntu)
** Tags removed: verification-needed-disco
** Tags added: verification-done-disco
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Christian Brauner (cbrauner)
** Changed in: linux (Ubuntu Disco)
Assignee: (unassigned) => Christian Brauner (cbrauner)
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** Tags removed: verification-needed-disco
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** Changed in: linux (Ubuntu Disco)
Assignee: (unassigned) => Christian Brauner (cbrauner)
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** Changed in: linux (Ubuntu Disco)
Assignee: (unassigned) => Christian Brauner (cbrauner)
** Tags removed: verification-needed-disco
** Tags added: verification-done-disco
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uced with the new patch.
Target kernels: All LTS kernels that do support shiftfs, if possible.
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Christian Brauner (cbrauner)
Status: In Progress
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => C
** Changed in: linux (Ubuntu)
Status: Incomplete => In Progress
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Christian Brauner (cbrauner)
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Public bug reported:
SRU Justification
Impact: Currently, shiftfs maintains a kmem cache for struct
shiftfs_file_info which stashes away a struct path and the struct file
for the underlay. The path however is never used anywhere so the struct
shiftfs_file_info and therefore the whole kmem cache c
** Tags removed: verification-needed-bionic
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Title:
br_netfilter: namespace sysctl operation
https://lists.ubuntu.com/archives/kernel-team/2019-September/103672.html
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Title:
ipv4: enable route flushing in network namespaces
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Title:
shiftfs: add O_DIRECT support
Status in l
** Tags removed: verification-needed-disco
** Tags added: verification-done-disco
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Title:
UBUNTU: SAUCE: shiftfs: pass correct point
See
https://lists.ubuntu.com/archives/kernel-team/2019-September/103670.html
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Title:
ipv4: enable route flushing in network namespac
cts: linux (Ubuntu)
Importance: Undecided
Assignee: Christian Brauner (cbrauner)
Status: In Progress
** Changed in: linux (Ubuntu)
Status: New => In Progress
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Christian Brauner (cbrauner)
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+1GB
sudo lxc exec b1 -- rm dummy.file
sudo zfs list default/containers/b1 # will show +1GB on a non-fixed kernel and
-1GB on a fixed kernel
Target Kernels: All LTS kernels with shiftfs support.
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Christian Brauner (cbr
** Tags removed: verification-needed-bionic
** Tags added: verification-done-bionic
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Title:
shiftfs: allow overlayfs
Status in linu
** Tags removed: verification-needed-bionic verification-needed-disco
** Tags added: verification-done-bionic verification-done-disco
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Title:
shiftfs: allow overlayfs
Status in linux
SRU request here:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1838677
Patchset here:
https://github.com/brauner/ubuntu-disco/tree/overlayfs_on_shiftfs
Mailing list patchset posting here:
https://lists.ubuntu.com/archives/kernel-team/2019-August/102741.html
** Changed in: linux (Ubuntu)
SRU request here:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1838677
Patchset here:
https://github.com/brauner/ubuntu-disco/tree/overlayfs_on_shiftfs
Mailing list patchset posting here:
https://lists.ubuntu.com/archives/kernel-team/2019-August/102741.html
** Tags added: shiftfs
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sudo systemctl stop docker
cat < Christian Brauner (cbrauner)
** Changed in: linux (Ubuntu)
Status: New => Confirmed
** Changed in: linux (Ubuntu)
Status: Confirmed => In Progress
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** Description changed:
SRU Justification
Impact: Currently, the /proc/sys/net/bridge folder is only created in
the initial network namespace. This blocks use-cases where users would
like to e.g. not do bridge filtering for bridges in a specific network
namespace while doing so for br
** Description changed:
SRU Justification
Impact: Currently, the /proc/sys/net/bridge folder is only created in
the initial network namespace. This blocks use-cases where users would
like to e.g. not do bridge filtering for bridges in a specific network
namespace while doing so for br
Brauner (cbrauner)
Status: In Progress
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Christian Brauner (cbrauner)
** Changed in: linux (Ubuntu)
Status: New => In Progress
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Status: Confirmed => In Progress
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Title:
shiftfs: add O_DIRECT support
Status in linux package
/ubuntu-disco/tree/shiftfs_direct_io
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Christian Brauner (cbrauner)
Status: Confirmed
** Changed in: linux (Ubuntu)
Status: New => Confirmed
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Christian B
eam kernel
Status in linux package in Ubuntu:
Fix Released
Bug description:
https://github.com/lxc/lxc/issues/1867
As of issue about Debian 9, Christian Brauner concluded
"unprivileged fuse mounts is a feature available in the Ubuntu kernel
only atm. We are actively working on push
** Description changed:
- Tools such as vpnc try to flush routes when run inside network
- namespaces by writing 1 into /proc/sys/net/ipv4/route/flush. This
- currently does not work because flush is not enabled in non-initial
- network namespaces.
- Since routes are per network namespace it is sa
** Description changed:
- Currently, the /proc/sys/net/bridge folder is only created in the initial
- network namespace. This patch ensures that the /proc/sys/net/bridge folder
- is available in each network namespace if the module is loaded and
- disappears from all network namespaces when the mo
Relevant upstream commits are:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ff6d090d0db41425aef0cfe5dc58bb3cc12514a2
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=22567590b2e634247931b3d2351384ba45720ebe
https://git.kernel.org/pub/
Relevant upstream commit is:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5cdda5f1d6adde02da591ca2196f20289977dc56
** Changed in: linux (Ubuntu)
Status: New => Confirmed
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Status: Incomplete => Confirmed
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Title:
br_netfilter: namespace sysctl operations
Status in li
Public bug reported:
Tools such as vpnc try to flush routes when run inside network
namespaces by writing 1 into /proc/sys/net/ipv4/route/flush. This
currently does not work because flush is not enabled in non-initial
network namespaces.
Since routes are per network namespace it is safe to enable
Public bug reported:
Currently, the /proc/sys/net/bridge folder is only created in the initial
network namespace. This patch ensures that the /proc/sys/net/bridge folder
is available in each network namespace if the module is loaded and
disappears from all network namespaces when the module is unl
** Changed in: linux (Ubuntu)
Status: Expired => Fix Released
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Christian Brauner (cbrauner)
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Sent patch:
https://lists.ubuntu.com/archives/kernel-team/2019-June/101305.html
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https://bugs.launchpad.net/bugs/1832316
Title:
shiftfs: allow changing ro/rw for subvolumes
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Changed in: linux (Ubuntu)
Status: Confirmed => In Progress
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Christian Brauner (cbrauner)
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Public bug reported:
SRU Justification
Impact: Stéphane reported regression for btrfs workloads employing shiftfs.
Unprivileged users can already toggle whether a subvolume will be ro or
rw. This is broken on current shiftfs as we haven't whitelisted these
ioctls().
Fix: To enable this with shif
See
https://git.launchpad.net/~cbrauner/ubuntu/+source/linux/+git/disco/log/?h=2019-05-07/shiftfs_btrfs_ioctls
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https://bugs.launchpad.net/bugs/1832316
Title:
shiftfs: allo
Public bug reported:
Unprivileged users can already toggle whether a subvolume will be ro or
rw. Not having this working with shiftfs regresses various use-cases.
Issues have already been seen by Stéphane Graber (Cced here).
To enable this with shiftfs we need to whitelist BTRFS_IOC_FS_INFO,
BTRFS
** Patch added:
"0001-UBUNTU-SAUCE-shiftfs-lock-down-certain-superblock-fl.patch"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1827122/+attachment/5260369/+files/0001-UBUNTU-SAUCE-shiftfs-lock-down-certain-superblock-fl.patch
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s it possible to have
one?
I quickly attempted to have root do the shiftfs mounts for the users, but it
seems the shift is always for the root of the current userns, and can't be done
for another user."
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Ch
Okay, I have a fix for the shiftfs side I think. Attached here.
** Patch added: "UBUNTU: SAUCE: shiftfs: use correct llseek method for"
https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1824812/+attachment/5256074/+files/0001-UBUNTU-SAUCE-shiftfs-use-correct-llseek-method-for-d.patch
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** Changed in: linux (Ubuntu)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1824735
Title:
shiftfs: use after free when checking mount option
** Description changed:
SRU Justification
Impact: We currently keep a reference to the shiftfs mark mount's
shiftfs_super_info which was stashed in the superblock of the mark mount. The
problem is that we only take a reference to the mount of the underlay, i.e. the
filesystem that is *u
** Description changed:
SRU Justification
Impact: We currently keep a reference to the shiftfs mark mount's
shiftfs_super_info which was stashed in the superblock of the mark mount. The
problem is that we only take a reference to the mount of the underlay, i.e. the
filesystem that is *u
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