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Bug 595420 - mounting subdirectory of non-root user account fails
Summary: mounting subdirectory of non-root user account fails
Alias: None
Product: Fedora
Classification: Fedora
Component: nfs-utils
Version: 16
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Steve Dickson
QA Contact: Fedora Extras Quality Assurance
Depends On:
Blocks: 599198
TreeView+ depends on / blocked
Reported: 2010-05-24 15:11 UTC by Kamil Páral
Modified: 2012-07-02 22:27 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
: 599198 (view as bug list)
Last Closed: 2012-07-02 22:27:52 UTC

Attachments (Terms of Use)

System ID Priority Status Summary Last Updated
Red Hat Bugzilla 826505 None None None Never

Internal Links: 826505

Description Kamil Páral 2010-05-24 15:11:50 UTC
Description of problem:
Use case 1:
# cat /etc/exports

# mount.nfs /mnt -v
mount.nfs: timeout set for Mon May 24 16:46:36 2010
mount.nfs: trying text-based options 'vers=4,addr=,clientaddr='
mount.nfs: mount(2): Permission denied
mount.nfs: access denied by server while mounting

# mount.nfs /mnt -v
mount.nfs: timeout set for Mon May 24 17:09:51 2010
mount.nfs: trying text-based options 'vers=4,addr=,clientaddr=' on /mnt type nfs
# ll -d /mnt/
drwx------. 94 kparal kparal 4096 May 24 12:43 /mnt/
# ll /mnt
ls: cannot open directory /mnt: Permission denied
# (ignores no_root_squash option)

Use case 2:
# cat /etc/exports

everything works perfect

Simply, for non-root owned directories, only the top-level directory can be exported. If you export a subdirectory, presented problems occur.

Version-Release number of selected component (if applicable):

How reproducible:
Always for my machines. Also reproduced by steved @ #fedora-devel.

Steps to Reproduce:
1. Share a subdirectory of non-root owned directory.
2. Try to mount it from a client.
3. Access denied by server.

Comment 1 Steve Dickson 2010-06-02 16:11:31 UTC
Your home directory '/home/kparal/' has a permission 
mode of 0700 (owner only), correct?

Comment 2 Steve Dickson 2010-06-02 20:18:39 UTC
It appears the no_root_squash export option is broken on
v4 mounts..

Comment 3 Kamil Páral 2010-06-03 08:22:37 UTC
(In reply to comment #1)
> Your home directory '/home/kparal/' has a permission 
> mode of 0700 (owner only), correct?    


Comment 4 Kamil Páral 2011-11-23 11:53:47 UTC
I have completely the same problem on Fedora 16. It has appeared again.


Comment 5 Kamil Páral 2012-04-16 15:11:25 UTC
The problem also appears with:


Steve, could you please have a look at that?

Comment 6 Steve Dickson 2012-05-29 13:11:57 UTC
The proposed upstream patch

Author: Steve Dickson <>
Date:   Tue May 29 08:57:04 2012 -0400

    Honor the no_root_squash flag on pseudo roots.
    If root squashing is turned off on a export that
    has multiple directories, the parent directories
    of the pseudo exports that's built, also needs to
    have root squashing turned off.
    Signed-off-by: Steve Dickson <>

diff --git a/utils/mountd/v4root.c b/utils/mountd/v4root.c
index 708eb61..ad8a3e7 100644
--- a/utils/mountd/v4root.c
+++ b/utils/mountd/v4root.c
@@ -92,7 +92,14 @@ v4root_create(char *path, nfs_export *export)
        exp = export_create(&eep, 0);
        if (exp == NULL)
                return NULL;
-       xlog(D_CALL, "v4root_create: path '%s'", exp->m_export.e_path);
+       /*
+        * Honor the no_root_squash flag 
+        */
+       if ((curexp->e_flags & NFSEXP_ROOTSQUASH) == 0)
+               exp->m_export.e_flags &= ~NFSEXP_ROOTSQUASH;
+       xlog(D_CALL, "v4root_create: path '%s' flags 0x%x", 
+               exp->m_export.e_path, exp->m_export.e_flags);
        return &exp->m_export;

Comment 7 Steve Dickson 2012-05-29 19:57:52 UTC
The koji build:

Comment 8 Fedora Update System 2012-05-29 20:11:37 UTC
nfs-utils-1.2.5-8.fc16 has been submitted as an update for Fedora 16.

Comment 9 Kamil Páral 2012-05-30 11:09:54 UTC
This fixes the problem only partially.

Now works:

Still doesn't work:

Comment 10 Steve Dickson 2012-05-30 11:24:14 UTC
(In reply to comment #9)
> This fixes the problem only partially.
> Now works:
> /home/kparal/devel,no_root_squash)
> Still doesn't work:
> /home/kparal/devel,all_squash,anonuid=500,anongid=500)
Ok... Lets open up another bz about anonuid/anongid not working so we can move the no_root_squash fix along... OK?

Comment 11 Kamil Páral 2012-05-30 11:33:29 UTC
Okey dokey. Opened bug 826505.

Comment 12 Fedora Update System 2012-06-15 12:25:53 UTC
Package nfs-utils-1.2.5-8.fc16:
* should fix your issue,
* was pushed to the Fedora 16 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing nfs-utils-1.2.5-8.fc16'
as soon as you are able to.
Please go to the following url:
then log in and leave karma (feedback).

Comment 13 Fedora Update System 2012-07-02 22:27:52 UTC
nfs-utils-1.2.5-8.fc16 has been pushed to the Fedora 16 stable repository.  If problems still persist, please make note of it in this bug report.

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