Re: [RFC v6 03/40] vfs: Add MAY_DELETE_SELF and MAY_DELETE_CHILD permission flags

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

 



On Fri, Aug 28, 2015 at 02:36:15PM -0700, Andy Lutomirski wrote:
> On Tue, Aug 4, 2015 at 4:53 AM, Andreas Gruenbacher
> <andreas.gruenbacher@xxxxxxxxx> wrote:
> > Normally, deleting a file requires write and execute access to the parent
> > directory.  With Richacls, a process with MAY_DELETE_SELF access to a file
> > may delete the file even without write access to the parent directory.
> >
> > To support that, pass the MAY_DELETE_CHILD mask flag to inode_permission()
> > when checking for delete access inside a directory, and MAY_DELETE_SELF
> > when checking for delete access to a file itelf.
> >
> > The MAY_DELETE_SELF permission does not override the sticky directory
> > check.  It probably should.
> 
> Silly question from the peanut gallery: is there any such thing as
> opening an fd pointing at a file such that the "open file description"
> (i.e. the struct file) captures the right to delete the file?
> 
> IOW do we need FMODE_DELETE_SELF?

I guess FMODE_READ and _WRITE make sense because we pass file
descriptors to read() and write().  But we don't have a way to pass a
file descriptor to an operation that deletes a file.

(I think Windows may be different in both respects, it might be
interesting to compare, but I really don't understand how it works...).

--b.
--
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