coda: Restrict coda messages to the initial pid namespace

Remove the slight chance that pids in coda messages will be
interpreted in the wrong pid namespace.

- Explicitly send all pids in coda messages in the initial pid
  namespace.
- Only allow mounts from processes in the initial pid namespace.
- Only allow processes in the initial pid namespace to open the coda
  character device to communicate with coda.

Cc: Jan Harkes <jaharkes@cs.cmu.edu>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

3 files changed, 10 insertions, 2 deletions

diff --git a/fs/coda/inode.c b/fs/coda/inode.c
index be2aa4909487..77bbaf4666a7 100644
--- a/fs/coda/inode.c
+++ b/fs/coda/inode.c
@@ -20,6 +20,7 @@
 #include <linux/file.h>
 #include <linux/vfs.h>
 #include <linux/slab.h>
+#include <linux/pid_namespace.h>
 
 #include <asm/uaccess.h>
 
@@ -157,6 +158,9 @@ static int coda_fill_super(struct super_block *sb, void *data, int silent)
         int error;
         int idx;
 
+        if (task_active_pid_ns(current) != &init_pid_ns)
+                return -EINVAL;
+
         idx = get_device_index((struct coda_mount_data *) data);
 
         /* Ignore errors in data, for backward compatibility */
diff --git a/fs/coda/psdev.c b/fs/coda/psdev.c
index 761d5b31b18d..dd60f905d4fe 100644
--- a/fs/coda/psdev.c
+++ b/fs/coda/psdev.c
@@ -37,6 +37,7 @@
 #include <linux/list.h>
 #include <linux/mutex.h>
 #include <linux/device.h>
+#include <linux/pid_namespace.h>
 #include <asm/io.h>
 #include <asm/poll.h>
 #include <asm/uaccess.h>
@@ -266,6 +267,9 @@ static int coda_psdev_open(struct inode * inode, struct file * file)
         struct venus_comm *vcp;
         int idx, err;
 
+        if (task_active_pid_ns(current) != &init_pid_ns)
+                return -EINVAL;
+
         idx = iminor(inode);
         if (idx < 0 || idx >= MAX_CODADEVS)
                 return -ENODEV;
diff --git a/fs/coda/upcall.c b/fs/coda/upcall.c
index 0c68fd31fbf2..5c6d2cd6ee86 100644
--- a/fs/coda/upcall.c
+++ b/fs/coda/upcall.c
@@ -50,8 +50,8 @@ static void *alloc_upcall(int opcode, int size)
                 return ERR_PTR(-ENOMEM);
 
         inp->ih.opcode = opcode;
-        inp->ih.pid = current->pid;
-        inp->ih.pgid = task_pgrp_nr(current);
+        inp->ih.pid = task_pid_nr_ns(current, &init_pid_ns);
+        inp->ih.pgid = task_pgrp_nr_ns(current, &init_pid_ns);
         inp->ih.uid = current_fsuid();
 
         return (void*)inp;