knfsd + 2.1.105 *very* strange bug (readdir & mount points)

Cyrille Chepelov (chepelov@rip.ens-cachan.fr)
Thu, 11 Jun 1998 16:47:49 +0200 (MET DST)


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---559023410-758783491-897576469=:18232
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Hi all,

I have seen a very strange knfsd behaviour under x86/linux, with several
different clients.

Server is girasol.cri.ens-cachan.fr, clients are
nikopol.rip.ens-cachan.fr (sparc/linux), obelix.rip (sparc32/solaris) and
saphir.cri (ultrasparc/solaris).

exportfs is the following (yes this is unsecure) :
/ obelix.rip.ens-cachan.fr(rw,no_root_squash)
/ nikopol.rip.ens-cachan.fr(rw,no_root_squash)
/ saphir.cri.ens-cachan.fr(rw,no_root_squash)

No problem getting the drive mounted.

When I do a ls, I see the strange result you can see in the
attached ls-l_client.txt file (on all clients) [sorry, but pine sucks when
it comes to pasting text with X]

I enabled in fs/nfsd/nfsfh.c the #define NFSD_DEBUG_VERBOSE 1 statement,
recompiled the modules, shut down the nfs, rmmod the module, reload nfs.
I then tried again to ls the mounted root.

The attached kmessages is the the debug output from the server... and it's
quite weird, indeed !

It seems that for each directory which is a mount point, the filldir_one
function receives two bytes of garbage appended to the name ... no wonder
that subsequent comparisons fail !
This of course trashes all my automounter efforts (no way for instance to
traverse /mnt/u or /mnt/usr )
The server's mount table is attached : all devices are locally mounted. I
knew one couln't re-export a NFS-mounted tree, but AFAIK local mount point
traversal is still permitted...

I did also a side test : exporting directly /home for instance, or /usr,
give the same results (rejection).

A possible starting point for tracking that weirdness looks to be in
nfsfh.c, function get_parent_ino : file.f_op->readdir(&file, &buffer,
filldir_one); statement, plus of course the filldir_one function itself.

However, it might as well be a ghoul lurking in the vfs code... I'm really
lost here.

I'm currently doing backward patches to see whether this behaviour is old
or not, but I'll post the results later, this P-100 is a bit slow to
travel in time that quick.

-- Cyrille

------------------------------
Zog Zog

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