[PATCH] proc: Fix namespace mountpoint path in /proc/mounts

From: Aditya Kali
Date: Fri Oct 25 2013 - 17:51:39 EST

Commit bf056bfa80596a5d14b26b17276a56a0dcb080e5:
"proc: Fix the namespace inode permission checks." converted
the namespace files into symlinks. The same commit changed
the way namespace bind mounts appear in /proc/mounts:
$ mount --bind /proc/self/ns/ipc /mnt/ipc
$ cat /proc/mounts | grep ipc
proc /mnt/ipc proc rw,nosuid,nodev,noexec 0 0

After commit bf056bfa80596a5d14b26b17276a56a0dcb080e5:
$ cat /proc/mounts | grep ipc
proc ipc:[4026531839] proc rw,nosuid,nodev,noexec 0 0

This breaks userspace which expects the 2nd field in
/proc/mounts to be a valid path. This patch restores the
original format of namespace bind-mount entries in

Signed-off-by: Aditya Kali <adityakali@xxxxxxxxxx>
fs/proc/namespaces.c | 10 ----------
1 file changed, 10 deletions(-)

diff --git a/fs/proc/namespaces.c b/fs/proc/namespaces.c
index 49a7fff..d19989d 100644
--- a/fs/proc/namespaces.c
+++ b/fs/proc/namespaces.c
@@ -48,19 +48,9 @@ static int ns_delete_dentry(const struct dentry *dentry)
return 1;

-static char *ns_dname(struct dentry *dentry, char *buffer, int buflen)
- struct inode *inode = dentry->d_inode;
- const struct proc_ns_operations *ns_ops = PROC_I(inode)->ns.ns_ops;
- return dynamic_dname(dentry, buffer, buflen, "%s:[%lu]",
- ns_ops->name, inode->i_ino);
const struct dentry_operations ns_dentry_operations =
.d_delete = ns_delete_dentry,
- .d_dname = ns_dname,

static struct dentry *proc_ns_get_dentry(struct super_block *sb,

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