RE: [RFC v3 20/45] richacl: Automatic Inheritance

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




> -----Original Message-----
> From: Andreas Grünbacher [mailto:andreas.gruenbacher@xxxxxxxxx]
> Sent: Wednesday, May 13, 2015 2:06 PM
> To: Frank Filz
> Cc: linux-kernel@xxxxxxxxxxxxxxx; linux-fsdevel@xxxxxxxxxxxxxxx; linux-
> nfs@xxxxxxxxxxxxxxx
> Subject: Re: [RFC v3 20/45] richacl: Automatic Inheritance
> 
> 2015-05-13 22:38 GMT+02:00 Frank Filz <ffilzlnx@xxxxxxxxxxxxxx>:
> > So inheritance will happen, but there is also a mode set as part of
> > the create that I assume is effectively handled the same as a subsequent
> chmod() on the file?
> 
> The effect is similar to a subsequent chmod except that the effective
> permissions may be fewer then the create mode:
> 
>  * In the traditional POSIX case, the effective permissions are
>    (create_mode & ~umask).
> 
>  * With POSIX ACLs and Richacls, if there are inheritable permissions,
>    the effective permissions are the intersection of the create mode and
>    the maximum permissions the inherited acl grants. So if the inherited
>    acl grants at most rwxr-x---, with a create mode of rw-rw-rw, the
>    effective permissions end up being rw-r-----.
> 
> > Any chance we could add a system call to do a open/create and pass an
> > ACL (and heck, if we go there, why not a system call that allows
> > creating with mtime, atime, owner, etc. also...).
> 
> Send patches, but expect them to get killed :)
> 
> > Is there a mode that we could pass that would cause the least amount
> > of damage to the inherited ACL?
> 
> Yes, 0777. But the RICHACL_PROTECTED flag will still be set, and that is the
> problem in this case.

I'm not clear what the RICHACL_PROTECTED flag actually does. It looks like it's only tested in chmod, and then only if the mode matches the mask (at least if I'm understanding the code right).

Frank

--
To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Linux Ext4 Filesystem]     [Union Filesystem]     [Filesystem Testing]     [Ceph Users]     [Ecryptfs]     [AutoFS]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux Cachefs]     [Reiser Filesystem]     [Linux RAID]     [Samba]     [Device Mapper]     [CEPH Development]
  Powered by Linux