Overlayfs fuse exploit github. 21 in Ubuntu through 15.
Overlayfs fuse exploit github. You signed out in another tab or window.
Overlayfs fuse exploit github Jul 16, 2020 · fuse-overlayfs --version fuse-overlayfs: version 1. 2 as you can see here. 0 is required. Sep 7, 2023 · The feature design itself prevents the creation of OverlayFS on top of OverlayFS (nested OverlayFS), restricting privilege escalation. Mar 26, 2024 · FUSE implementation for overlayfs. c and exp. 04/15. 04 does not properly check permissions for file creation in the upper filesystem directory, which allows local users to obtain root access by leveraging a configuration in which overlayfs is permitted in an arbitrary mount namespace. - DataDog/security-labs-pocs Download fuse-overlayfs. 1 Expected behavior In setuid mode with default settings, a SIF file should use squashfuse but not fuse-overlayfs. conf for the user specifically to fuse-overlays, the result of the podman info command above looks more correct and returns false indicating it is using fuse-overlayfs. Oct 3, 2018 · You signed in with another tab or window. Jan 13, 2020 · You signed in with another tab or window. Steps to reproduce: spin up a small VM (e. 31 2021 kernel vulnerability in Ubuntu. 自己编译内核： 准备漏洞版本范围内的，5. - The mail in here asks for an update to the OS of the web host, some series Linux kernel CVEs have been found, one in particular noteworthy: OverlayFS / FUSE. Upon submission, your changes will be run on the appropriate platforms to give the reviewer an opportunity to confirm that the changes result in a successful build. com/containers/fuse-overlayfs/ - manics/fuse-overlayfs-builder Mar 2, 2023 · In creating a device based container infrastructure, we are using crun, and would like to also incorporate the fuse-overlayfs. You signed in with another tab or window. The vulnerability is the result of failing to verify the ability of a user to set the attributes in a running executable. Jan 5, 2016 · Linux Kernel 4. If I call the same script from a systemd user service, fuse-overlayfs does not create the mount and does not throw an e Jun 22, 2020 · $ fuse-overlayfs --version fuse-overlayfs: version 1. x upstream to CentOS Apr 12, 2020 · it looks fuse-overlays it trying to read from the lower layer, that is also referring to the fuse-overlayfs mount. e. Jun 22, 2020 · Is it possible to enable fuse-overlayfs with dockerd as shipped in the standard rootless docker install? I'm testing rootless docker (and podman) on CERN systems with the right system requirements for fuser-overlayfs. Hace poco SSD-Discloure lanzó un PoC para un exploit del kernel de Ubuntu . I use rootless podman to build container images based on the official archlinux docker image. Static binary build of https://github. But as opposed to the author of 344 issue I do not have any game running issues until I trying to access looped folder directly. Skip to content. Aug 21, 2019 · /kind bug Description Doing a dnf install inside a Fedora container or a Silverblue toolbox results in failed transaction and corrupted container. local exploit for Linux platform FUSE implementation for overlayfs. Add a description, image, and links to the fuse-overlayfs topic page so that developers can more easily learn about it. Same use case. 2 using FUSE kernel interface version 7. References Jun 14, 2020 · I have strange issue with fuse-overlayfs, which is perfectly reproducible, but I can't build any minimal sample for that. local exploit for Linux platform Exploit Database FUSE implementation for overlayfs. Mar 25, 2023 · After using fuse-overlayfs to mount my browser profile, I noticed some significant slow down in response time. Apr 17, 2021 · The overlayfs implementation in the linux kernel did not properly validate with respect to user namespaces the setting of file capabilities on files in an underlying file system. Mar 6, 2024 · It is almost as if the default install thinks the non-root user should be using native overlayfs. Actual behavior fuse-overlyfs is used even with the --underlay option. 7 FUSE library version 3. There were a bunch of ducplicate header includes I removed, and a lot of the comment title area just to cut down on size # Also removed the on-the-fly compilation of ofs-lib. The . Contribute to thawkhant/linux-exploit-suggester-tool development by creating an account on GitHub. 4. 3. Jul 22, 2021 · You signed in with another tab or window. This uid mapping bug allows a local user to escalate their privileges on the system. Their content is merged. Apr 23, 2022 · I think it will be difficult anyway to support this scenario. Jul 14, 2023 · The exploit code for this flaw is available publicly over the internet. 0-rc. A plugin is loaded into fuse- May 17, 2020 · fuse-overlayfs leaks file descriptors with directory creation/deletion in rootless container #210 Closed castedo opened this issue May 17, 2020 · 12 comments A flaw was found in the Linux kernel, where unauthorized access to the execution of the setuid file with capabilities was found in the Linux kernel’s OverlayFS subsystem in how a user copies a capable file from a nosuid mount into another mount. -o upperdir=upperdir A directory merged on top of all the lowerdirs Apr 6, 2023 · Description After our buildah image was upgraded using the v1. Esta vulnerabilidad fue muy grave ya que OverlayFS se instalaba de forma predeterminada en Ubuntu1804 Server. 9 with podman build from sources it fails to find fuse-overlayfs under /usr/local/bin. Mar 19, 2023 · If I run the following script from a shell, the mount is created as expected. log file Aug 1, 2023 · You signed in with another tab or window. 15貌似有坑)，开启overlay 和fuse 两个fs： ubuntu 21. 2 does not properly restrict the mount namespace, which allows local users to gain privileges by mounting an overlayfs filesystem on top of a FUSE filesystem, and then executing a crafted setuid program. Reload to refresh your session. 04上的提权. But the last request cannot be satisfied since fuse-overlayfs is already blocked to serve your initial request. 04. 0. Nov 4, 2023 · A Linux kernel bug in overlayfs can lead to a dangerous root privilege escalation. Specifically, when Overlayfs sends the set attributes data to the underlying file system via `vfs_setxattr`, it fails to first verify the data by calling `cap_convert_nscap`. Kernel's FUSE module has paranoid permission checks, and likely denies the request if the file has another owner. 利用条件: 可以unshar 或可以创建overlay文件系统. CVE-2016-1576 . initscript mounting openrc squashfs unionfs aufs overlayfs You signed in with another tab or window. Task 2 - CVE-2021-3493 - OverlayFS Exploit; Deploy the machine with the Start Machine button in this task and wait up to 2 minutes for the VM to boot. Jan 30, 2020 · Moved from containers/buildah#2116 Description Podman fails when pushing some containers images to registry in rootless mode. I do see v0. c using Vim editor or nano editor in the terminal. More than 100 million people use GitHub to discover, fork, and contribute to over 330 million projects. Prerequisites. src. 29. Nov 22, 2016 · Ubuntu 15. 19. Grab the source code for the exploit from SSD-Disclosure here and save it as exploit. In the example, everything in the upper and lower layers is owned by root and mapped to my user in fuse-overlayfs so it would be mapped back to root in a user namespace (I am running this outside of a user namespace to prepare a root file system for podman --rootfs). Jul 6, 2023 · Each time it ran, fuse-overlayfs would get into an unkillable state, even with kill -9. Aside from rootless, `fuse-overlayfs` could be potentially used for eliminating `chown()` calls that happen in userns-remap mode, because `fuse-overlayfs` also provides shiftfs functionality. c on the target machine. It's also reproducible if you create a symlink that doesn't point to any existing file: [s More than 100 million people use GitHub to discover, fork, and contribute to over 330 million projects. 7 in wine in podman :) Issue looks like this. 18 by unprivileged users in an user namespace. Ideally, if there were 0. -o lowerdir=low1[:low2] A list of directories separated by :. SSD Advisory. Sep 9, 2021 · Hi Giuseppe, I see. Jan 13, 2022 · When generating images for Dockerfile via buildah running in a Docker container, a file is corrupted when using fuse-overlayfs. 3 (Ubuntu 14. Jul 31, 2018 · You signed in with another tab or window. fuse-overlayfs plugin for rootless containerd. While crun is licensed under GPL2, fuse-overlayfs is GPL3. Just run the command: pip install fuse-overlayfs. I noticed that both the lowerdir and the mountpoint were the same, ending in "rootfs". Contribute to xkaneiki/CVE-2023-0386 development by creating an account on GitHub. 0-16-generic实测可以完成： 在漏洞分析之前，我们先让chatGPT cosplay一下linux内核专家： 漏洞的公开信息比较少，比较直接的就是漏洞的补丁信息，补丁链接如下： Jan 27, 2023 · May 4, 2023: Proof-of-concept (PoC) exploits appear on GitHub; The vulnerability, dubbed CVE-2023-0386, is trivial to exploit and applicable to a wide-ranging set of popular Linux distributions and kernel versions. This is when using fuse-ove Dec 15, 2021 · /kind bug Description On CentOS7. You switched accounts on another tab or window. But, If I set the storage. g. SSH into the machine with the credentials provided in the task text. So, I am trying to figure out what are the steps to release 0. Oct 10, 2011 · Saved searches Use saved searches to filter your results more quickly May 16, 2022 · The overlayfs implementation in the linux (aka Linux kernel) package before 3. I was hoping there was a way to tune or even hardcode some attributes in the source code to get the same performance as we're looking for the same level of performance as vfs/overlay2 as the key reason for looking at fuse-overlayfs is for linux extended attributes support which vfs does not have. <distribution> from releases. # direct copy of code from exploit-db. Mar 20, 2021 · You signed in with another tab or window. 5. " 本文的理论知识（命名空间、overlay文件系统、fuse文件系统等）均来自chatGPT。 漏洞编号: CVE-2023-0386. It works well when executing the same build/push process with root user. Jan 28, 2022 · You signed in with another tab or window. 2 prebuilt x86_64 amazonlinux2 I have been trying to use fuse-overlayfs to merge two goofys s3 folders. Oct 10, 2011 · GitHub community articles First：Upload fuse. ChatGPT：详细介绍一下linux中的OverlayFS. overlay. ` fails at this line with error: [. 18. 10 内核版本5. I succeeded using migratefs (a fork of fuse-overlayfs) but had a different issue (copyup permission Jun 18, 2021 · A simple scenario to reproduce the issue is below. When we reviewed the changes made to the Linux kernel to fix CVE-2023-0386 (out of curiosity), we observed that Linux restricted file creation to $ ls /dev | grep fuse fuse System information: $ uname -a Linux stephen 5. Contribute to RitabrataDas343/OverlayFS development by creating an account on GitHub. Compile the exploit with gcc. Before exploitation, some system requirements are needed to be satisfied for the exploit to run. failed to commit container for result of RUN echo Hello, world! when running as non-root user and unprivileged. When we reviewed the changes made to the Linux kernel to fix CVE-2023-0386 (out of curiosity), we observed that Linux restricted file creation to Task 2 - CVE-2021-3493 - OverlayFS Exploit; Deploy the machine with the Start Machine button in this task and wait up to 2 minutes for the VM to boot. 9. Toggle navigation Oct 31, 2018 · Hi, I was testing fuse-overlayfs when I noticed some issues when using symlinks. When mounted using /usr/bin/mount: dd if=/dev/zero of=/h If you would like to improve the fuse-overlayfs recipe or build a new package version, please fork this repository and submit a PR. , an access made through fuse-overlayfs should not end up inside the same fuse-overlayfs process again). Apr 16, 2021 · "Ubuntu specific issue in the overlayfs file system in the Linux kernel where it did not properly validate the application of file system capabilities with respect to user namespaces. As root user it works just Aug 12, 2021 · I've been happily cruising along using Fedora+ZFS+Podman to run a variety of services. Contribute to containerd/fuse-overlayfs-snapshotter development by creating an account on GitHub. Due to the combination of unprivileged user namespaces along with a patch carried in the Ubuntu kernel to allow unprivileged overlay mounts, an attacker could use this Apr 15, 2023 · After perusing different places, it seems that while fuse-overlayfs may or may not openly support it, I've found a number of different places where the mountpoint is set to either a lowerdir or the upperdir, which may make barring this behavior problematic for those doing this already. 1 version we noticed all our pipelines that were using buildah build started to fail on our gitlab runners. Find and fix vulnerabilities Nov 1, 2022 · However, the latest version of fuse-overlayfs for the Linux distribution we use - CentOS 7 - is 0. Aug 17, 2024 · # fuse-overlayfs -h unknown argument ignored: lazytime usage: fuse-overlayfs [options] <mountpoint> -h --help print help -V --version print version -d -o debug enable debug output (implies -f) -f foreground operation -s disable multi-threaded operation -o clone_fd use separate fuse device fd for each thread (may improve performance) -o max_idle_threads the maximum number of idle worker threads fuse-overlayfs cannot handle this recursive access (i. Since several days, podman fails to build the images when using fuse-overlayfs - vfs seems to work fine. Or you can download and install the wheel file from release page manually. Proof of concept code for Datadog Security Labs referenced exploits. The overlayfs implementation in the linux (aka Linux kernel) package before 3. Because both vulnerabilities involve namespace creation using unshare with -m flag, the container needs to be privileged with no seccomp profile, which is a default configuration Issue Description Setting storage. fuse-overlayfs within Docker for volume mounts. 10) - 'overlayfs' Local Privilege Escalation (1). I have very fun setup, with python 2. Overlayfs combines two layers, upper and lower, in a filesystem. CVE-2023-0386在ubuntu22. So if you use a lower layer as the mount target, fuse-overlayfs itself will end up requesting files that are on the fuse-overlayfs mount itself. Nov 15, 2019 · `fuse-overlayfs` provides rootless overlayfs functionality without depending on any kernel patch. It is based on alpine linux with fuse3, is compiled from fuse-overlayfs sources and leverages s6-overlay's SIGTERM handling to achive clean fuse-overlayfs unmounts when the container is stopped This project started as a fork of fuse-overlayfs, an implementation of overlay+shiftfs in FUSE for rootless containers, but the project has significantly diverged since then, and operates on very different premises. Also, please note that, when using fuse-overlayfs from a user namespace (for example, when using rootless podman) a Linux Kernel > v4. Saved searches Use saved searches to filter your results more quickly Could you strace the fuse-overlayfs process before the ls -lh so we can see better what is happening? You can run fuse-overlayfs normally, then from another terminal: $ strace -o /tmp/fuse-overlayfs. Static Build: This project provides a convenient way to automatically perform a static build using a container. 3 on GitHub. 1-Ubuntu SMP Thu Nov 14 12:06:39 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux. Figure 4 shows a failed attempt. 6 fuse-overlayfs 1. Jul 27, 2023 · To exploit the flaw, the attacker could copy a SUID file from a specially crafted FUSE mount to a regular directory. Oct 20, 2019 · You signed in with another tab or window. I am deploying these in what I think is the recommended pattern based on interacting with podman for a little while now. 31 fusermount3 version: 3. fc34. This is some output of installing firefox inside arch linux with pacman. fuse-overlayfs plugin for rootless containerd on old Linux (not needed on modern Linux) - containerd/fuse-overlayfs-snapshotter fuse-overlayfs provides an overlayfs FUSE implementation so that it can be used since Linux 4. This script exploit the CVE-2023-2640 and CVE-2023-32629 for vulnerability on OverlayFS that affected some versions of Ubuntu. Aug 1, 2024 · I think what should be done is to do copy-on-write under the user running fuse-overlayfs while not caring about the user of the file in the lowerdir? I bet the write request doesn't even come to fuse-overlayfs in that case. 04 with kernel 5. Nov 5, 2019 · Is it possible to port fuse-overlayfs to MAC OS ? The text was updated successfully, but these errors were encountered: 👍 5 Jichao, christian-korneck, JeffCarpenter, cmoulliard, and ConorSheehan1 reacted with thumbs up emoji CVE-2023-0386 analysis and Exp. Two installation options are supported: Embed fuse-overlayfs plugin into the containerd binary; Execute fuse-overlayfs plugin as a separate binary; Choose 1 if you don't mind recompiling containerd, otherwise choose 2. May 12, 2022 · The overlayfs implementation in the Linux kernel through 4. This happens when invoked as non-privileged user. force_mask=0700 changes the permissions of files newly created inside a running container. Jan 4, 2018 · Update your Linux kernels and reboot as soon as possible. Changes to lower-layer files are reflected in the upper layer, but things get tricky when upper and lower directories are in different user namespaces. Meanwhile the exploit can be mitigated by removing the "fuse" package which contains the fusermount command. options. Steps to reproduce the issue: podman --log-level=debug run -ti --restart=no --rm fedora In Dec 6, 2022 · Yes it is same issue. More than 100 million people use GitHub to discover, fork, and contribute to over 420 million projects. 11 ~ 5. Mar 31, 2023 · fuse-overlayfs uses lower1 layer in merged/ but reports the inode numbers from lower2. Vulnerabilities Exploitation On Ubuntu 22. x), we could have pulled that in to fix the issue at our end. c and we do that manually ahead of time, or drop the binary. 2 Host, $ uname -a Linux mohanlaptop1 5. Contribute to lliurex/fuse-overlayfs development by creating an account on GitHub. CVE-2021-3493 is an Ubuntu-specific issue in the overlayfs file system in the Linux kernel where it did not properly validate the application of file system capabilities to user namespaces. -o upperdir FUSE implementation for overlayfs. Jul 14, 2023 · Circa April 2021, an Ubuntu-specific local privilege escalation vulnerability was discovered in which the OverlayFS file system allowed unprivileged local users under Ubuntu to gain root privileges. Dec 20, 2022 · fuse-overlayfs is mostly in maintenance mode at this point since there is a native file system in the kernel that replaces it, so it is unlikely I am going to spend much time troubleshooting fuse-overlayfs unless it is a major issue. Write better code with AI Security. 7. Aug 31, 2020 · bob@bob-XPS-13-9360 ~/a/s/fedora> singularity shell -B /overlay --fusemount "container:fuse-overlayfs -o lowerdir=/overlay/lower -o upperdir=/overlay/upper -o workdir=/overlay/work /merged" fuse-fedora. FATAL: container creation failed: image driver mount failure: image driver fuse-overlayfs instance exited with error: fuse-overlayfs exited: fuse: device not found, try 'modprobe fuse' first fuse-overlayfs: cannot mount: No such file or directory Dec 22, 2018 · # ls lower a aaa aaa1 aaa2 # ls upper b bbb bbb1 bbb2 # fuse-overlayfs -o lowerdir=lower,upperdir=upper,workdir=work merged # ls merged/ a aaa aaa1 aaa2 b bbb bbb1 bbb2 # rm -rf merged/aaa rm: cannot remove ‘merged/aaa’: Invalid cross-device link # rm -rf merged/bbb rm: cannot remove ‘merged/bbb’: Invalid cross-device link Oct 16, 2018 · You signed in with another tab or window. The PR modifies the behavior by using /proc/self/fd/3/ instead of directly accessing /boot. I can confirm about a 7x slow down just using a simple dd file write. So what happens is: YOUR REQUEST -> kernel -> fuse-overlayfs -> kernel -> fuse-overlayfs. ; Move and rename the binary to /usr/bin/fuse-overlayfs; chmod +x /usr/bin/fuse-overlayfs Also, please note that, when using fuse-overlayfs from a user namespace (for example, when using rootless podman) a Linux Kernel > v4. md Line 36 in f8ba9ad `buildah bud -t fuse-overlayfs -f . This is not the case when using overlayfs (without fuse). 10 - 'USERNS ' Overlayfs Over Fuse Privilege Escalation. Contribute to chenaotian/CVE-2023-0386 development by creating an account on GitHub. 0 using FUSE kernel interface version 7. You signed out in another tab or window. as in lower2, arch and busybox are the same inode (they are hard linked), fuse-overlayfs reports the same inode number for merged/bin/arch and merged/bin/busybox despite them being different file type (a symlink and a regular file) Two installation options are supported: Embed fuse-overlayfs plugin into the containerd binary; Execute fuse-overlayfs plugin as a separate binary; Choose 1 if you don't mind recompiling containerd, otherwise choose 2. /Dockerfile. Contribute to pmihsan/OverlayFS-CVE-2021-3493 development by creating an account on GitHub. I'm also trying to use fuse-overlay tool for mapping game folder with mods into multi-master directory. Mar 31, 2019 · When trying to run fuse-overlayfs from inside a chroot, there are hard to pin down, subtle errors. Jul 6, 2023 · A flaw was found in the Linux kernel, where unauthorized access to the execution of the setuid file with capabilities was found in the Linux kernel’s OverlayFS subsystem in how a user copies a capable file from a nosuid mount into another mount. 0-37-generic #40~18. The fuse filesystem may contain SUID binaries, but those cannot be used to gain privileges due to nosuid mount options. 3 or 0. This issue and its solution were mentioned in a PR for fuse-overlayfs. 13. When executed from a regular directory, this would grant them root privileges. Contribute to containers/fuse-overlayfs development by creating an account on GitHub. 3 (or any 0. CVE-2015-8660 . There are cases where we cannot use *at syscalls, so we need to use the full path for file operations. Contribute to sxlmnwb/CVE-2023-0386 development by creating an account on GitHub. A local attacker could use this to gain elevated privileges, due to a patch carried in Ubuntu to allow unprivileged overlayfs mounts. 1. Version of Apptainer 1. Jul 28, 2022 · libfuse 3. Contribute to cerodah/overlayFS-CVE-2021-3493 development by creating an account on GitHub. AWS/t2 fuse-overlayfs plugin for rootless containerd. FUSE implementation for overlayfs. directory contains Dockerfile: FROM debian:buster RUN echo Hello, world!. This will prevent users from mounting any FUSE filesystem except through unprivileged user namespaces, and the exploit does not work through unprivileged user namespaces. log -f -p $(pgrep fuse-overlayfs) Then run ls -lh, once it terminates, stop the strace process and please attach the /tmp/fuse-overlayfs. This would definitely break backwards compatibility since You signed in with another tab or window. 2. (10/15) Creating temporar Aug 21, 2019 · Building the library using builda bud as explained in the docs fuse-overlayfs/README. 影响范围: 5. Create a fuse-overlayfs mount, merging the content of a read only source, and a read/write source folder. 0-21. 3. modding overlayfs modding-tools fuse-overlayfs Updated Feb Sep 1, 2021 · First of all, Thank you for making this fuse filesystem, it is very useful inside containers! Unfortunately, the program has issues with properly reflecting updates to files in lowerdir, which makes it useless if the lowerdir is not stat FUSE implementation for overlayfs. 利用效果: 本地提权. The exploit code that we would be used for exploitation is written in C Language and can be found here. sif Singularity> mkdir -p /merged/my/new/dir mkdir: cannot create directory '/merged/my/new': Operation not permitted Singularity> mkdir -p /merged/my/new/dir mkdir: cannot create directory Sep 19, 2019 · You signed in with another tab or window. 0-1. 0 FUSE library version 3. Tested on Ubuntu 20. 1 using FUSE kernel interface version 7. --debug Enable debugging mode, can be very noisy. rpm recently and noticed some odd breakage when using it which appears to be caused by my attempts to overmount the single lowerdir I specify. I first tried to change the lowerdir name, but got a complaint about it needing to be named "rootfs", so instead in this commit I changed the name of the mountpoint, and Nov 11, 2019 · I tried on my local machine with sshfs as upperdir / workdir, unfortunately if I change the files remotely (e. 8. 15版本之外的 (5. Sometimes symlinks stay in upper but are not visible from merged. 1 The text was updated successfully, but these errors were encountered: Alternative for #79 Add a simple plugin mechanism that will help to expand fuse-overlayfs functionalities, in particular it allows to load data from a layer on demand. Fuse Version: $ fuse-overlayfs --version fuse-overlayfs: version 0. Linux privilege escalation auditing tool. Looking up OverlayFS / FUSE exploit gets us to a datadog link that indicates you can identify your linux kernel by using the command uname -r, anything that has a version number lower Jul 27, 2023 · To exploit the flaw, the attacker could copy a SUID file from a specially crafted FUSE mount to a regular directory. static . add a new file), it shows up properly in sshfs based upperdir, but the merged directory is not showing the changes. Seems like an issue with the fuse-overlayfs package We're using Exploit For OverlayFS . 漏洞产品: linux kernel - overlay文件系统. The actual umask is ignored. 21 in Ubuntu through 15. Curate this topic Add this topic to your repo fuse-overlayfs plugin for rootless containerd on old Linux (not needed on modern Linux) - containerd/fuse-overlayfs-snapshotter Go to the link provided and save the exploit as exploit. This module exploits a vulnerability in Ubuntu's implementation of overlayfs. The vulnerability was reported by an independent security researcher to the SSD Secure Disclosure program and was assigned the designation of CVE On Ubuntu Wily it is possible to place an USERNS overlayfs mount over a fuse mount. Feb 8, 2020 · Description podman build -t test . Compile the code using the command FUSE implementation for overlayfs. sh to the /tmp directory. Aug 9, 2021 · I upgraded fuse-overlayfs to fuse-overlayfs-1. 4-arch1-1 #1 SMP PREEMPT Thu, 18 Jun 2020 16:01:07 +0000 x86_64 GNU/Linux fuse-overlayfs provides an overlayfs FUSE implementation so that it can be used since Linux 4. tuiiw jasbo ggfvg gjeaw ujmuvcq fxuep foyam msqkr skmlldf oehg