[Bug 36312] New: User belonging to another Group has no access when chmod 0040

[Bug 36312] New: User belonging to another Group has no access when chmod 0040

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=36312

           Summary: User belonging to another Group has no access when
                    chmod 0040
           Product: File System
           Version: 2.5
    Kernel Version: 2.6.39
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: low
          Priority: P1
         Component: ext4
        AssignedTo: fs_ext4@kernel-bugs.osdl.org
        ReportedBy: ubuntuefnet@gmail.com
        Regression: Yes


This may not be a bug, this may be intentional - however it was considered
pretty damn weird when encountered and worth a mention.

Say we have user 'bob', he is the owner of file 'accounting.txt' and
'accounting.txt' has group 'staff' attributed to the file which 'bob' is a part
of. If the permissions for the file only have group perms (e.g 0060), 'bob'
will not be able to access 'accounting.txt', however all other users in the
'staff' group will have access.

Replication via CLI:

touch myfile.txt && chown `whoami`:`groups | awk '{print $2}'` myfile.txt &&
chmod 0040 myfile.txt && cat myfile.txt

System: Debian 6.0.1
Arch: x86_64
Kernel: 2.6.39

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[Bug 36312] User belonging to another Group has no access when chmod 0040

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=36312


Jan Kara <jack@suse.cz> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jack@suse.cz
         AssignedTo|fs_ext4@kernel-bugs.osdl.or |jack@suse.cz
                   |g                           |




--- Comment #1 from Jan Kara <jack@suse.cz>  2011-05-31 18:43:43 ---
Yes, this works as defined in the standard. If user is the owner, we check
against owner bits. If the user is not the owner, but belongs to the owner
group, we check against group bits. If user falls into neither of previous
cathegories, we use 'other' bits.

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