** Also affects: linux-lts-wily (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1531747
Title:
overlay: mkdir fails if directory
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,
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
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
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
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
>
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
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
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,
apport information
** Attachment added: "ProcCpuinfo.txt"
https://bugs.launchpad.net/bugs/1947718/+attachment/5534262/+files/ProcCpuinfo.txt
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apport information
** Attachment added: "Lspci.txt"
https://bugs.launchpad.net/bugs/1947718/+attachment/5534259/+files/Lspci.txt
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https://bugs.launchpad.net/bugs/1947718
apport information
** Attachment added: "ProcModules.txt"
https://bugs.launchpad.net/bugs/1947718/+attachment/5534265/+files/ProcModules.txt
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apport information
** Attachment added: "Lsusb-v.txt"
https://bugs.launchpad.net/bugs/1947718/+attachment/5534261/+files/Lsusb-v.txt
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apport information
** Attachment added: "Lspci-vt.txt"
https://bugs.launchpad.net/bugs/1947718/+attachment/5534260/+files/Lspci-vt.txt
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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
** 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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apport information
** Attachment added: "UdevDb.txt"
https://bugs.launchpad.net/bugs/1947718/+attachment/5534266/+files/UdevDb.txt
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apport information
** Attachment added: "ProcCpuinfoMinimal.txt"
https://bugs.launchpad.net/bugs/1947718/+attachment/5534263/+files/ProcCpuinfoMinimal.txt
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apport information
** Attachment added: "ProcInterrupts.txt"
https://bugs.launchpad.net/bugs/1947718/+attachment/5534264/+files/ProcInterrupts.txt
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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
This is a kernel regression and now almost three months old. Could
somebody please have a look?
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https://bugs.launchpad.net/bugs/1947718
Title:
overlay: permission
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
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