I now tested with newer kernels: The regression is still present in
5.15.0-33-generic from the hwe-edge package for Ubuntu 20.04.
I also tested kernels from the Ubuntu Mainline Kernel Archive. It works
with 5.13.0-051300-generic and fails with 5.14.0-051400-generic and also
still with 5.18.3-05180
This is a kernel regression and now almost three months old. Could
somebody please have a look?
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Title:
overlay: permission regressi
apport information
** Attachment added: "ProcInterrupts.txt"
https://bugs.launchpad.net/bugs/1947718/+attachment/5534264/+files/ProcInterrupts.txt
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apport information
** Attachment added: "WifiSyslog.txt"
https://bugs.launchpad.net/bugs/1947718/+attachment/5534267/+files/WifiSyslog.txt
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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Status set to "Confirmed" as requested by the bot after uploading logs
(although I did upload them when creating the issue as well...).
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apport information
** Tags added: apport-collected
** Description changed:
Since kernel 5.4.0-89.100 on Focal and 4.15.0-159.167 on Bionic I can no
longer mount an overlay filesystem over directories like / in a user
namespace. With kernel versions 5.4.0-88.99 and 4.15.0-158.166,
respect
Public bug reported:
Since kernel 5.4.0-89.100 on Focal and 4.15.0-159.167 on Bionic I can no
longer mount an overlay filesystem over directories like / in a user
namespace. With kernel versions 5.4.0-88.99 and 4.15.0-158.166,
respectively, this still works.
An easy way to test this is the follow
Thanks!
>> I noticed that in the list of affected packages in the bug metadata
>> Bionic is not mentioned. Will the fix also be backported there?
>
> It depends on which kernel you are talking about. The bionic GA kernel
> (4.15) was not affected based on my testing. If you are seeing problems
> w
Thanks!
I tested it on a Focal machine and the -proposed kernel works. However,
I don't have a Groovy machine here, is it necessary for me to test this?
I noticed that in the list of affected packages in the bug metadata
Bionic is not mentioned. Will the fix also be backported there?
** Tags rem
I noticed that the changelog of the kernel package 5.4.0-50.55~18.04.1
for Bionic now also includes the two additional patches, and indeed I
can confirm that on Bionic with kernel 5.4.0-54-generic the regression
was now also introduced.
Is there an update whether it will be possible to solve this
Public bug reported:
We use unprivileged user namespaces with overlay mounts for containers.
After recently upgrading our Focal kernels to 5.4.0-51.56 this breaks,
one cannot access files through the overlay mount in the container
anymore. This is very likely caused by some of the patches that wer
Tyler, thanks for the clarification.
I have tested it with 4.15.0-42-generic from bionic-proposed and can
confirm it is fixed.
** Tags removed: verification-needed-bionic
** Tags added: verification-done-bionic
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I find the demand to test the fix within 5 days, combined with the
threat of dropping the patch otherwise, unreasonable.
In my original report of this security problem I have already provided a
script that allows to reproduce the problem and check if it still
exists.
Requiring an answer within 5
I tested 4.4.0-22.38_amd64 on Ubuntu 14.04 with an overlay over an NFS4
mount (same situation as in comment #7) and the crash when reading
existing files from the lower layer is gone.
I did not test overlay over NFS3.
I still cannot successfully write to files that exist in the lower layer
("Oper
I also experience this problem using the Xenial kernel 4.4.0-18.34~14.04.1 on
Ubuntu 14.04.
I can even reproduce it as a non-root user by creating an overlay mount inside
a user namespace.
After mounting an overlay over an NFS mount, I can successfully traverse
existing directories and create, w
** Also affects: linux-lts-wily (Ubuntu)
Importance: Undecided
Status: New
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Title:
overlay: mkdir fails if directory exist
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