To prepare for virtualization of SecurityFS, use simple_pin_fs and
simpe_release_fs only when init_user_ns is active.
Signed-off-by: Stefan Berger <stefanb@xxxxxxxxxxxxx>
Signed-off-by: James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
---
security/inode.c | 30 +++++++++++++++++++++---------
1 file changed, 21 insertions(+), 9 deletions(-)
diff --git a/security/inode.c b/security/inode.c
index 6c326939750d..1a720b2c566d 100644
--- a/security/inode.c
+++ b/security/inode.c
@@ -21,9 +21,10 @@
#include <linux/security.h>
#include <linux/lsm_hooks.h>
#include <linux/magic.h>
+#include <linux/user_namespace.h>
-static struct vfsmount *mount;
-static int mount_count;
+static struct vfsmount *securityfs_mount;
+static int securityfs_mount_count;
static void securityfs_free_inode(struct inode *inode)
{
@@ -109,6 +110,7 @@ static struct dentry *securityfs_create_dentry(const char *name, umode_t mode,
const struct file_operations *fops,
const struct inode_operations *iops)
{
+ struct user_namespace *ns = current_user_ns();
struct dentry *dentry;
struct inode *dir, *inode;
int error;
@@ -118,12 +120,17 @@ static struct dentry *securityfs_create_dentry(const char *name, umode_t mode,
pr_debug("securityfs: creating file '%s'\n",name);
- error = simple_pin_fs(&fs_type, &mount, &mount_count);
- if (error)
- return ERR_PTR(error);
+ if (ns == &init_user_ns) {
+ error = simple_pin_fs(&fs_type, &securityfs_mount,
+ &securityfs_mount_count);
+ if (error)
+ return ERR_PTR(error);
+ }
- if (!parent)
- parent = mount->mnt_root;
+ if (!parent) {
+ if (ns == &init_user_ns)
+ parent = securityfs_mount->mnt_root;
