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| author |   Eric W. Biederman <ebiederm@xmission.com> | 2014-07-31 04:35:20 -0700 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2014-08-04 09:28:32 -0700 |
| commit | 65b38851a17472d31fec9019fc3a55b0802dab88 (patch) | |
| tree | 4b5830300b5cbd722f5b1680b96aaa5e72c0d638 /fs/nfs/netns.h | |
| parent | mnt: Add tests for unprivileged remount cases that have found to be faulty (diff) | |
| download | linux-dev-65b38851a17472d31fec9019fc3a55b0802dab88.tar.xz linux-dev-65b38851a17472d31fec9019fc3a55b0802dab88.zip | |
NFS: Fix /proc/fs/nfsfs/servers and /proc/fs/nfsfs/volumes
The usage of pid_ns->child_reaper->nsproxy->net_ns in
nfs_server_list_open and nfs_client_list_open is not safe.
/proc for a pid namespace can remain mounted after the all of the
process in that pid namespace have exited. There are also times
before the initial process in a pid namespace has started or after the
initial process in a pid namespace has exited where
pid_ns->child_reaper can be NULL or stale. Making the idiom
pid_ns->child_reaper->nsproxy a double whammy of problems.
Luckily all that needs to happen is to move /proc/fs/nfsfs/servers and
/proc/fs/nfsfs/volumes under /proc/net to /proc/net/nfsfs/servers and
/proc/net/nfsfs/volumes and add a symlink from the original location,
and to use seq_open_net as it has been designed.
Cc: stable@vger.kernel.org
Cc: Trond Myklebust <trond.myklebust@primarydata.com>
Cc: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'fs/nfs/netns.h')
| -rw-r--r-- | fs/nfs/netns.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/nfs/netns.h b/fs/nfs/netns.h index 8ee1fab83268..ef221fb8a183 100644 --- a/fs/nfs/netns.h +++ b/fs/nfs/netns.h @@ -29,6 +29,9 @@ struct nfs_net { #endif spinlock_t nfs_client_lock; struct timespec boot_time; +#ifdef CONFIG_PROC_FS + struct proc_dir_entry *proc_nfsfs; +#endif }; extern int nfs_net_id; |