The semantics of paths in VFS modules

[Uri Simchoni]

On 04/02/2016 11:17 PM, Richard Sharpe wrote:
> On Sat, Apr 2, 2016 at 12:54 PM, Uri Simchoni <uri at samba.org> wrote:
>> Hi,
>>
>> I would like to document the meaning of path names in the wiki
>> (add it to the vfs module writing page), and thought I'd first submit it
>> to the list to get comments.
> 
> In general I like it.
> 
> There are some special cases, I think, such as if you allow wide
> links, then Samba cannot use paths relative to the root of the share.
> 
> Maybe it falls under what you have already written.
Thanks for reading and commenting.

I haven't covered this one, and should probably write something about
wide links (I intend to cover more semantics of individual functions and
this can fall under realpath). However, it appears to me that even if
wide links are allowed, smbd would not, as a result, hand paths which
are not relative to the share's root to VFS modules.

I mean, if we have "foo" --> /etc/shadow, then the SMB operations are on
foo, and so are the resulting VFS operations. There's realpath_fn which
would *return* /etc/shadow, but smbd would use the return val only for
comparison and not pass it on to other VFS modules.

Please correct me if I'm wrong.
Uri.