[9fans] linux 9p: uid & gid

[9fans] linux 9p: uid & gid

[Oleg]

Hi, all.

I wrote a 9p fs with help of libixp and after mounting i see strange uid and
gid numbers for files:

~# mount -t 9p -o trans=unix,noextend q t
~# ls -l t
-rw-rw-rw- 1 4294967294 4294967294 1 Jan  1  1970 conf
-rw-rw-rw- 1 4294967294 4294967294 1 Jan  1  1970 data
-rw-rw-rw- 1 4294967294 4294967294 1 Jan  1  1970 stat

If i do mount with dfltuid and dfltgid, i get normal values:

~# mount -t 9p -o trans=unix,noextend,trans=unix,noextend,dfltuid=0,dfltgid=0 q t
~# ls -l t
-rw-rw-rw- 1 root root 1 Jan  1  1970 conf
-rw-rw-rw- 1 root root 1 Jan  1  1970 data
-rw-rw-rw- 1 root root 1 Jan  1  1970 stat

But in any case chown call to these files sends empty uid and gid strings in
wstat T-message.

Is there any way to make uid & gid works as expected?

Thanks.

-- 
Олег Неманов (Oleg Nemanov)

Re: [9fans] linux 9p: uid & gid

[Charles Forsyth]

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4294967294 probably started off as -2, which some systems used for user
"nobody"

On Thu, Jun 20, 2019 at 4:04 PM Oleg <lego12239@yandex.ru> wrote:

> Hi, all.
>
> I wrote a 9p fs with help of libixp and after mounting i see strange uid
> and
> gid numbers for files:
>
> ~# mount -t 9p -o trans=unix,noextend q t
> ~# ls -l t
> -rw-rw-rw- 1 4294967294 4294967294 1 Jan  1  1970 conf
> -rw-rw-rw- 1 4294967294 4294967294 1 Jan  1  1970 data
> -rw-rw-rw- 1 4294967294 4294967294 1 Jan  1  1970 stat
>
> If i do mount with dfltuid and dfltgid, i get normal values:
>
> ~# mount -t 9p -o
> trans=unix,noextend,trans=unix,noextend,dfltuid=0,dfltgid=0 q t
> ~# ls -l t
> -rw-rw-rw- 1 root root 1 Jan  1  1970 conf
> -rw-rw-rw- 1 root root 1 Jan  1  1970 data
> -rw-rw-rw- 1 root root 1 Jan  1  1970 stat
>
> But in any case chown call to these files sends empty uid and gid strings
> in
> wstat T-message.
>
> Is there any way to make uid & gid works as expected?
>
> Thanks.
>
> --
> Олег Неманов (Oleg Nemanov)
>
>

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Re: [9fans] linux 9p: uid & gid

[Oleg]

On Thu, Jun 20, 2019 at 05:34:03PM +0100, Charles Forsyth wrote:
> 4294967294 probably started off as -2, which some systems used for user
> "nobody"

Yes. I understand that linux kernel try to keep work in this case and choose
this uid and gid. But it would be great if i can manage permissions as usual.
I need to give access to files based on uid and gid.


-- 
Олег Неманов (Oleg Nemanov)

Re: [9fans] [OBORONA-SPAM] Re: linux 9p: uid & gid

[lego12239]

On Fri, Jun 21, 2019 at 11:34:22AM +0300, Oleg wrote:
> On Thu, Jun 20, 2019 at 05:34:03PM +0100, Charles Forsyth wrote:
> > 4294967294 probably started off as -2, which some systems used for user
> > "nobody"
> 
> Yes. I understand that linux kernel try to keep work in this case and choose
> this uid and gid. But it would be great if i can manage permissions as usual.
> I need to give access to files based on uid and gid.

In previous project i use FUSE and permissions works well. Now i try 9p and
want to use the same approach with file permissions. But may be it mistake and
i need to use a different approach with granting access to files with 9p.

-- 
Олег Неманов (Oleg Nemanov)