I can confirm this bug with overlayfs on top of tmpfs, I think it
happens when a program does fsetxattr on a file.
I was able to reproduce it with sed which uses setxattr when it creates
a new file, the shell does not do this when creating a file and does not
trigger the bug.
`touch /tmp/foo; sed -i '' /tmp/foo; cat /tmp/foo` results in EACCES
from open(2) in cat(1).
sed:
fsetxattr(4, "system.posix_acl_access",
"\2\0\0\0\1\0\6\0\377\377\377\377\4\0\4\0\377\377\377\377
\0\4\0\377\377\377\377", 28, 0) = 0
cat:
open("/tmp/foo", O_RDONLY) = -1 EACCES (Permission denied)
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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1840328
Title:
Regression in overlayfs between 4.4.0-157 and 4.4.0-159
Status in linux package in Ubuntu:
Confirmed
Bug description:
My xenial gate jobs began failing after the nodes began running
4.4.0-159.
The gist of this bug is that a file sitting in /posix.ini for example,
copied there by ucf from /usr/share/php7.2-common/common/posix.ini,
cannot be read by non-root users despite its permission bits being
0644. chmodding 0644 on top of the file fixes this, also rebooting the
lxc container solves it as well.
After downgrading the same test node to 4.4.0-157 and re-running the
same tests, the broken behavior does not occur.
Please see the attachments for the exact commands used to reproduce this.
---
AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code
2: ls: cannot access '/dev/snd/': No such file or directory
AplayDevices: Error: [Errno 2] No such file or directory
ApportVersion: 2.20.1-0ubuntu2.19
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory
CRDA: N/A
DistroRelease: Ubuntu 16.04
IwConfig: Error: [Errno 2] No such file or directory
Lspci: Error: [Errno 2] No such file or directory
Lsusb: Error: [Errno 2] No such file or directory
MachineType: OpenStack Foundation OpenStack Nova
Package: linux (not installed)
PciMultimedia:
ProcEnviron:
TERM=screen
PATH=(custom, no user)
LANG=C.UTF-8
SHELL=/bin/bash
ProcFB:
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-159-generic
root=LABEL=cloudimg-rootfs ro console=tty0 console=ttyS0,115200 no_timer_check
nofb nomodeset vga=normal
ProcVersionSignature: Ubuntu 4.4.0-159.187-generic 4.4.185
RelatedPackageVersions:
linux-restricted-modules-4.4.0-159-generic N/A
linux-backports-modules-4.4.0-159-generic N/A
linux-firmware N/A
RfKill: Error: [Errno 2] No such file or directory
Tags: xenial xenial
UdevDb: Error: [Errno 2] No such file or directory
Uname: Linux 4.4.0-159-generic x86_64
UnreportableReason: The report belongs to a package that is not installed.
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:
WifiSyslog:
_MarkForUpload: False
dmi.bios.date: 04/01/2014
dmi.bios.vendor: SeaBIOS
dmi.bios.version: 1.10.2-1ubuntu1~cloud0
dmi.chassis.type: 1
dmi.chassis.vendor: QEMU
dmi.chassis.version: pc-i440fx-bionic
dmi.modalias:
dmi:bvnSeaBIOS:bvr1.10.2-1ubuntu1~cloud0:bd04/01/2014:svnOpenStackFoundation:pnOpenStackNova:pvr18.2.0:cvnQEMU:ct1:cvrpc-i440fx-bionic:
dmi.product.name: OpenStack Nova
dmi.product.version: 18.2.0
dmi.sys.vendor: OpenStack Foundation
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