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Bug#1108534: e2fsprogs: getfattr returns different values for posix acls when using fuse2fs

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On Tue, 1 Jul 2025, Theodore Ts'o wrote:

> On Mon, Jun 30, 2025 at 07:08:58PM +0100, Tim Woodall wrote:
>> Package: e2fsprogs
>> Version: 1.47.0-2
>> Severity: minor
>>
>> Dear Maintainer,
>>
>> Without using fuse at all:
>> # touch x
>> # setfacl -m u:root:rw x
>> # getfattr -m - -d x
>> # file: x
>> system.posix_acl_access=0sAgAAAAEABgD/////AgAGAAAAAAAEAAQA/////xAABgD/////IAAEAP////8=
>>
>>
>> When done via fuse2fs:
>> # which fuse2fs
>> /usr/bin/fuse2fs
>> # mkdir mnt
>> # fuse2fs img mnt
>> # touch mnt/x
>> # setfacl -m u:root:rw mnt/x
>> # getfattr -m - -d mnt/x
>> # file: mnt/x
>> system.posix_acl_access=0sAgAAAAEABgAAAAAAAgAGAAAAAAAEAAQAAAAAABAABgAAAAAAIAAEAAAAAAA=
>>
>
> Hmm, I can't replicate this on e2fsprogs 1.47.3~rc2-1.  I believe this
> was fixed by this commit:
>
> commit 0111bdb70a9c460052387111414a2e2dc8c06822
> Author: Darrick J. Wong <djwong@kernel.org>
> Date:   Thu Apr 24 14:41:49 2025 -0700
>
>    fuse2fs: remove posix acl translation
>
>    Remove the POSIX ACL format translation since libext2fs takes care of
>    that now.
>

This is very strange.

I cannot reproduce it on a trixie machine
root@trixie17-build:/build# fuse2fs -V
fuse2fs 1.47.2 (1-Jan-2025)
FUSE library version 3.17.2
using FUSE kernel interface version 7.40
fusermount3 version: 3.17.2
root@trixie17-build:/build# apt-cache policy fuse2fs
fuse2fs:
   Installed: 1.47.2-3+b1

root@trixie17-build:~# uname -a
Linux trixie17-build.home.woodall.me.uk 6.12.27-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.12.27-1 (2025-05-06) x86_64 GNU/Linux

root@trixie17-build:~# setfacl -m u:root:rw mnt/x
root@trixie17-build:~# getfattr -m - -d mnt/x
# file: mnt/x
system.posix_acl_access=0sAgAAAAEABgD/////AgAGAAAAAAAEAAQA/////xAABgD/////IAAEAP////8=

But when I build the latest code from master on a bookworm machine I 
can:
root@dirac:/build/dump-sf/testing/scripts# /tmp/fuse2fs -V
fuse2fs 1.47.3-rc2 (12-Jun-2025)
FUSE library version 3.14.0
using FUSE kernel interface version 7.31
fusermount3 version: 3.14.0

root@dirac:/build/dump-sf/testing/scripts# uname -a
Linux dirac.home.woodall.me.uk 6.1.0-37-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.140-1 (2025-05-22) x86_64 GNU/Linux

root@dirac:/build/dump-sf/testing/scripts# getfattr -m - -d mnt/x
# file: mnt/x
system.posix_acl_access=0sAgAAAAEABgAAAAAAAgAGAAAAAAAEAAQAAAAAABAABgAAAAAAIAAEAAAAAAA=


And I've just realized that the trixie version is in bookworm-backports. 
Installing that and I get the same:

root@dirac:/build/dump-sf/testing/scripts# apt-cache policy fuse2fs
fuse2fs:
   Installed: 1.47.2-3~bpo12+1

root@dirac:/build/dump-sf/testing/scripts# fuse2fs -V
fuse2fs 1.47.2 (1-Jan-2025)
FUSE library version 3.14.0
using FUSE kernel interface version 7.31
fusermount3 version: 3.14.0

root@dirac:/build/dump-sf/testing/scripts# getfattr -m - -d mnt/x
# file: mnt/x
system.posix_acl_access=0sAgAAAAEABgAAAAAAAgAGAAAAAAAEAAQAAAAAABAABgAAAAAAIAAEAAAAAAA=


So it seems that my change is only needed on older kernels.

Tim.

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Bug#1108534: e2fsprogs: getfattr returns different values for posix acls when using fuse2fs Tim Woodall <debianbugs@woodall.me.uk> - 2025-06-30 20:30 +0200
  Bug#1108534: e2fsprogs: getfattr returns different values for posix acls when using fuse2fs "Theodore Ts'o" <tytso@mit.edu> - 2025-07-02 06:00 +0200
    Bug#1108534: e2fsprogs: getfattr returns different values for posix acls when using fuse2fs Tim Woodall <debianbugs@woodall.me.uk> - 2025-07-02 21:00 +0200
      Bug#1108534: e2fsprogs: getfattr returns different values for posix acls when using fuse2fs "Theodore Ts'o" <tytso@mit.edu> - 2025-07-02 23:20 +0200
        Bug#1108534: e2fsprogs: getfattr returns different values for posix acls when using fuse2fs Tim Woodall <tim@woodall.me.uk> - 2025-07-03 00:40 +0200

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